Abstract

An optical-fiber measurement cable (10) for a radiation environment, the cable having high-temperature resistance, burning resistance, and radiation resistance, includes: a base member (1) made of PEEK and having an embossed surface; and optical cables (4) provided in a central portion inside the base member (1), the cable being formed in a tape shape as a whole, and is characterized in that the optical cables (4) have, inside thereof, optical fibers (2) for measurement, and the surfaces of the optical cables (4) are covered by inorganic-organic hybrid polymer films (3).

IPC Classes  ?

• G02B 6/44 - Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
• G01D 5/26 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light
• G02B 6/00 - Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Abstract

A fiber optic cable includes a braided core (1) defining a plurality of helical grooves (3a-3c), and one or more optical fibers (4a-4c) disposed along one or more of the helical grooves (3a-3c) of the braided core (1). The elongated structures braided to form the braided core (1) are composed of braided ropes (2a-2c) or monolithic wires (2d-2f). An outer layer disposed over an outer surface of the braided core is composed of a metal layer (5) or a flexible plastic layer (6).

IPC Classes  ?

• G02B 6/44 - Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
• G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres
• G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis

Abstract

This power cable monitoring system comprises a power cable (100) including a power transmission cable (1) disposed in an inner circumferential portion, an armor wire (2) disposed in an outer circumferential portion, and a sensor rope (3, 4) including an optical fiber (7), for detecting a physical quantity of an object being measured, and a backscattered light measuring device (110) for measuring a distribution of the physical quantity of the object being measured, using backscattered light from the optical fiber (7), wherein a temperature and a strain distribution of the power cable (100) are obtained by means of a frequency shift signal of Rayleigh backscattered light obtained by the backscattered light measuring device (110), and a polarization distribution signal obtained by means of the Rayleigh backscattered light, on the basis of a signal detected by the sensor rope (3, 4).

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre

Abstract

An intelligent stirring system (100) for stirring a solution (30), the intelligent stirring system (100) comprising: a motor (7); a contactless electric power supply system (3); inverters (5, 6) for supplying electric power to the motor (7) and the contactless electric power supply system (3); a stirring tank (10) having an induction heating coil (2) for heating the solution (30) and a stirring blade (1) for stirring the solution (30), the stirring tank (10) being configured to enable thermal control of regions obtained by dividing a reserved solution (30) into a plurality of zones; optical fiber sensors (9a, 9b) for measuring the distribution of a physical quantity pertaining to a substance being controlled, parts of the optical fiber sensors (9a, 9b) being disposed within the stirring tank; optical-fiber-signal-analyzing equipment (50) for receiving and analyzing signals from the optical fiber sensors (9a, 9b); a control panel (51) for configuring a control quantity for each of the divided regions according to an output from the optical-fiber-signal-analyzing equipment (50); and a controller (52) for transmitting the control quantity for each region as configured by the control panel (51) to the inverters (5, 6). The amount of heat applied to each region can be configured on the basis of data from the controller (52).

IPC Classes  ?

• B01F 27/80 - Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
• B01F 35/90 - Heating or cooling systems
• G05D 23/00 - Control of temperature

Abstract

A Rayleigh intensity pattern measurement device (100) comprises: a broadband wavelength variable LD(1); an optical coupler (4) which causes oscillated LD light to be incident on an optical fiber and emits Rayleigh scattering light from the optical fiber to a path that is different from the incident path of the LD light; a reception unit (13) which receives coherent light and the Rayleigh scattering light from the wavelength variable LD(1); and an RIP digital processing unit (14) which receives an output signal from the reception unit (13) through an AD converter (6), calculates a cross-correlation coefficient from two different Rayleigh intensity pattern signals obtained from the Rayleigh scattering light on the basis of data including phase information, and stores the cross-correlation coefficient obtained from the result of comparison with a given threshold value, wherein when the compared cross-correlation coefficient is smaller than the threshold value, a strain-distribution or a temperature distribution of a subject is measured by calculating the cross-correlation coefficient until the cross-correlation coefficient is equal to or greater than the threshold value and determining a Rayleigh frequency shift from the cross-correlation coefficient that is equal to or greater than the threshold value.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre

Abstract

This integrated IGA-DFOS system includes: an optical fiber (3) that is mounted to an object to be measured and senses a physical amount of the object to be measured; a distributed calculation optical fiber measurement device (4) that calculates the physical amount of the object to be measured on the basis of a sensing signal detected by the optical fiber (3) and obtains a distribution state of the physical amount; and a fiber-mesh-incorporated IGA analysis tool incorporating a fiber mesh that is modeled by a non-uniform rational B-spline base function and forms a shape of the optical fiber (3). The integrated IGA-DFOS system: inputs, to the fiber-mesh-incorporated IGA analysis tool, the distribution state of the physical amount of the object to be measured that is measured by the distributed calculation optical fiber measurement device (4) at a mounting position of the optical fiber (3); and analyzes and obtains the distribution state of the physical amount of the object to be measured at a position other than the mounting position of the optical fiber (3).

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre

Abstract

An armored DSS cable (40, 50), wherein an inner layer part and a surface layer part are configured concentrically. The inner layer part is composed of a first rope (3) wound in a spiral shape. The surface layer part is configured by spirally winding, on the same diameter line: a first optical fiber; an optical fiber module (10, 10a) having the optical fiber (1) and a plurality of second ropes (2) that spirally surround the optical fiber (1) and have an outer diameter smaller than that of the first rope (3); and a plurality of third ropes (4) having an outer diameter larger than that of the first rope (3).

IPC Classes  ?

• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge

Abstract

A distributed position detection rope (100, 101) that comprises: basic optical elements (5) that include an optical fiber (1), a tensile strength body (2) that sandwiches the optical fiber (1), and a sheath material (3) that covers the optical fiber (1) and the tensile strength body (2); a cylindrical inside sheath layer (8b) that is provided coaxially and includes a plurality of first optical elements (5a) that are basic optical elements (5) that are arranged at the same radial position in a cross-section that is perpendicular to the axis of the distributed position detection rope and wound in a spiral at a prescribed pitch in the axial direction; and a cylindrical outside sheath layer (9) that is provided coaxially outside the inside sheath layer (8b) and includes a plurality of second optical elements (5b) that are basic optical elements (5) that are arranged at the same radial position in a cross-section that is perpendicular to the axis and wound in a spiral in the axial direction at a different placement angle from the basic optical elements (5) that are first optical elements (5a).

IPC Classes  ?

• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge

Abstract

This method specifies time-space, and detects and identifies vibration on the basis of an optical fiber signal feature. The method includes: a step 1 for expanding a feature with respect to initial data of a vibration signal from a distributed-type optical fiber sensor, and acquiring an expansion feature function vector and C number of vibration categories; a step 2 for calculating a dimension reduction matrix on the basis of the expansion feature function vector; a step 3 for acquiring a reduced-dimension feature function by applying the dimension reduction matrix to the initial data and the expansion feature function vector; a step 4 for acquiring a primary classification parameter from a parameter database and performing classification to acquire primary classification results for the vibration signal; and a step 5 for deleting erroneous detection results and correcting erroneous classification with respect to the primary classification results, and acquiring and outputting secondary classification results of the vibration signal.

IPC Classes  ?

• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Abstract

In the present invention, in measurement requiring high BOTDR spatial resolution, inter-pulse-code modulation is carried out using a pulse train of a plurality of pulses having intervals therebetween that are at least the length of the lifespan of a phonon. As a method for this inter-pulse-code modulation using correlation, a Golay code, which results in no correlation side lobe, is used. As a method not using correlation, inter-pulse-code modulation is carried out using a Hadamard matrix that is inverted through signal processing.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres

Abstract

In the present invention, a plurality of through-holes are formed in a metallic cylindrical pipe that composes the outer circumferential part of a fiber-in-metallic-tube that is provided to an optical fiber cable and has an optical fiber provided therein that serves as a pressure sensor for measuring a distributed pressure, temperature, and strain system, and pressure blocking parts are provided so as to be distributed in the axial direction.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres
• G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
• G01L 11/02 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group or by optical means

Abstract

In the present invention, when the correlation between initial data and target data in the frequency range of Rayleigh scattered light is determined, through the comparison of analysis results for the initial Rayleigh scattering spectrum (RSS) obtained from initial data measurement and analysis results for the target RSS obtained from target data measurement, previously obtained target RSS analysis results are subjected to distance correction, and Rayleigh spectral shift is determined on the basis of the correlation coefficient between the target RSS after distance correction and the initial RSS.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres

Abstract

This DPTSS cable is provided with at least two metal wire cables that each have a groove formed in the axial direction in the outer circumferential section and that each have an optical fiber in the groove. One of the metal wire cables is an optical fiber-embedded cable in which an optical fiber is embedded along the groove. The other one of the metal wire cables has a characteristic different from that of the former metal wire cable.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre

Abstract

A distributed fiber optic acoustic detection device using a phase noise cancelling (PNC)-distributed acoustic sensing (DAS) technique, which is a novel distributed acoustic sensing technique involving laser light phase noise cancelling.

IPC Classes  ?

• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
• G01V 1/00 - Seismology; Seismic or acoustic prospecting or detecting

Abstract

A fiber optic biodiagnostic sensor system provided with: a vascular insertion type device for measuring pressure distribution, the device being inserted into a blood vessel of a living body and measuring the temperature and pressure distribution of an object to be measured at predetermined locations, the device being provided with a single-mode (SM) optical fiber that deforms with temperature and strain, a structure which contacts the SM optical fiber and converts the pressure of the object to be measured (blood pressure) into the strain of the optical fiber, and an outer layer covering the SM optical fiber and the structure; and a measurement device for detecting frequency variation in scattered light generated by laser beam emission to the SM optical fiber and calculating and determining the blood pressure of the optical fiber at the predetermined locations on the basis of the temperature variation and strain variation for the SM optical fiber as determined from the frequency variation.

IPC Classes  ?

• G01L 11/02 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group or by optical means
• A61B 5/0215 - Measuring pressure in heart or blood vessels by means inserted into the body
• A61B 5/1459 - Measuring characteristics of blood in vivo, e.g. gas concentration, pH-value using optical sensors, e.g. spectral photometrical oximeters invasive, e.g. introduced into the body by a catheter
• A61B 10/00 - Other methods or instruments for diagnosis, e.g. for vaccination diagnosis; Sex determination; Ovulation-period determination; Throat striking implements
• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• G01K 11/12 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in colour, translucency or reflectance
• G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis

Abstract

In this optical fiber cable which includes an optical fiber core wire which measures pressure and a multilayer armored cable which measures temperature, a desired gap layer having an annular shape is formed between the optical fiber core wire and the multilayer armored cable, and fixing members which fix the optical fiber core wire and the multilayer armored cable are provided at a prescribed interval in the axial direction of the optical fiber cable.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01K 11/12 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in colour, translucency or reflectance
• G01L 11/02 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group or by optical means

Abstract

In the present invention, by way of a single optical fiber that is wound and attached to the outer circumference of a cylindrical body and that senses temperature and strain in the cylindrical body deformed by the pressure of a liquid, the pressure of the liquid is found from the strain in the cylindrical body generated by the pressure of the liquid by detecting changes both in the Brillouin scattering frequency and in the Rayleigh scattering frequency for the light scattered in the optical fiber and thereby separating and simultaneously detecting the temperature and strain in the cylindrical body.

IPC Classes  ?

• G01L 11/02 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group or by optical means
• G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
• G01L 5/00 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

Abstract

A plurality of optical fibers is embedded in a helical shape in a cylindrical attachment layer of the external periphery of a form body having a circular cross section. The optical fibers are deformed by the deformation generated in the form body due to bending, twisting, or elongating deformation produced by external pressure of the form body. A three-dimensional position after deformation produced by the bending, twisting, or elongating deformation of the form body is measured using the phase change or change in frequency in Rayleigh scattering or Brillouin scattering, which is scattered light from a pulse laser light emitted into the optical fiber, the phase change or change in frequency being generated by the deformation.

IPC Classes  ?

• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre

Abstract

The present invention is designed to measure the distributions of a Brillouin frequency shift and a Rayleigh frequency shift in an optical fiber laid in a substance from the scattered wave of pulsed laser light incident on the optical fiber, and analyze the distributions along the optical fiber of the pressure, temperature, and strain of the substance at the time of measurement using a coefficient that is unique to the laid optical fiber and associates the pressure, temperature, and strain of the substance with the Brillouin frequency shift and the Rayleigh frequency shift.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• B01J 19/00 - Chemical, physical or physico-chemical processes in general; Their relevant apparatus
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01D 21/02 - Measuring two or more variables by means not covered by a single other subclass
• G01K 11/12 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in colour, translucency or reflectance
• G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
• G01L 5/00 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

Abstract

While a known pressure is applied externally to a reference member on which an optical fiber is fixed, a test light is made to enter the optical fiber and at least one of a reference Brillouin measurement, for finding the amount of reference Brillouin frequency shift based on the Brillouin scattering phenomenon, or a reference Rayleigh measurement, for finding the amount of reference Rayleigh frequency shift based on the Rayleigh scattering phenomenon, is performed. A Brillouin measurement coefficient or a Rayleigh measurement coefficient is found from these calculation results. A sample member for which volumetric change is unknown is fixed to the optical fiber, and a sample Brillouin measurement or a sample Rayleigh measurement is performed to find the amount of frequency shift. The volumetric change of the sample member is found from the amount of sample Brillouin frequency shift or the amount of sample Rayleigh frequency shift, and the Brillouin measurement coefficient or the Rayleigh measurement coefficient.

IPC Classes  ?

• G01D 21/00 - Measuring or testing not otherwise provided for
• G01V 8/16 - Detecting, e.g. by using light barriers using one transmitter and one receiver using optical fibres

Abstract

In the present invention, a distributed optical fiber sound wave detection device is provided with an optical pulse emission unit that causes an optical pulse to be incident in an optical fiber and a Rayleigh scattered light reception unit for receiving Rayleigh-scattered light produced in the optical fiber. The optical pulse emission unit has a length that is prescribed on the basis of the length dimension of the optical fiber and outputs the optical pulse that is modulated using a code sequence which causes the optical pulse to be divided into a plurality of cells of prescribed lengths. The Rayleigh scattered light reception unit performs demodulation, corresponding to the modulation performed by the optical pulse emission unit, on the Rayleigh-scattered light, and the Rayleigh scattered light reception unit comprises a phase variation derivation unit for determining phase variation on the basis of the Rayleigh-scattered light subjected to the demodulation and a sound wave detection unit that, on the basis of the phase variation determined by the phase variation derivation unit, determines sound waves that have struck the optical fiber.

IPC Classes  ?

• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Abstract

Provided is a distributed optical fiber sensor capable of measuring the strain and temperature of an object to be measured simultaneously and independently with high spatial resolution. A distributed optical fiber sensor (FS) uses an optical fiber (15) as a sensor, wherein a distortion and temperature detector (14) measures the amount of Brillouin frequency shift due to the strain and temperature generated in the optical fiber (15) using a Brillouin scattering phenomenon, measures the amount of Rayleigh frequency shift due to the strain and temperature generated in the optical fiber (15) using a Rayleigh scattering phenomenon, and calculates the strain and temperature generated in the optical fiber (15) from the measured amount of Brillouin frequency shift and amount of Rayleigh frequency shift.

IPC Classes  ?

• G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01K 11/12 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in colour, translucency or reflectance

Abstract

A distributed optical fiber sensor capable of measuring strain and/or temperature with high accuracy and high spatial resolution without requiring any manual adjustment. The distributed optical fiber sensor utilizing the Brillouin scattering phenomenon comprises a stepwise optical pulse light source generating an optical pulse having a stepwise distribution of light intensity increasing toward the center, a CW light source generating a continuous light, a sensing optical fiber which receives an optical pulse as a probe light and the continuous light as a pumping light and in which a Brillouin scattering phenomenon occurs between the probe light and the pump light, and a Brillouin time domain detector for determining the Brillouin loss or the gain spectrum from the light emerging from the sensing optical fiber and attributed to the Brillouin scattering phenomenon, and determining the distribution of strain caused in the sensing optical fiber in the longitudinal direction thereof and/or the distribution of temperature from the Brillouin loss or gain spectrum.

IPC Classes  ?

• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
• G01K 11/12 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in colour, translucency or reflectance