Abrégé

The purpose of the present invention is to achieve a flow regulating structure that improves the performance of a gas sensor. The flow regulating structure (32) comprises a plurality of rail structures. Each rail structure has a plurality of rod-shaped members (50) that are arranged side-by-side with the same direction of extension. The plurality of rail structures are disposed along the direction of gas travel in overlapping positions with space therebetween. The extension directions of the rod-shaped members (50) differ between adjacent rail structures. In each rail structure, the plurality of rod-shaped members (50) are arranged side-by-side with the same direction of extension in both a first virtual plane and a second virtual plane, which face one another in the direction of gas travel, and when viewed from the direction of gas travel, the rod-shaped members (50) disposed on the second virtual plane are positioned between adjacent members among the plurality of rod-shaped members (50) disposed on the first virtual plane.

Classes IPC  ?

• G01N 29/024 - Analyse de fluides en mesurant la vitesse de propagation ou le temps de propagation des ondes acoustiques
• G01N 29/32 - Dispositions pour supprimer des influences indésirables, p.ex. des variations de température ou de pression

Abrégé

The purpose of the present invention is to achieve a gas-liquid separator that improves the performance of a gas sensor. The gas-liquid separator (16) comprises: a swirl structure that causes a gas heading from upstream to downstream to swirl about a flow axis heading from upstream to downstream; a separation structure that discharges outward liquid components contained in the gas passing through the swirl structure; and a deflection structure that is provided downstream of the swirl structure and deflects the gas that has passed through the swirl structure. The deflection structure is provided with: a narrowing core portion (26) that has a three-dimensional shape which narrows from upstream to downstream; and deflecting fins (32) that are provided to the side surface of the narrowing core portion (26) and deflect the gas in the opposite direction to the swirling direction resulting from the swirl structure.

Classes IPC  ?

• B01D 45/12 - Séparation de particules dispersées dans des gaz ou des vapeurs par gravité, inertie ou force centrifuge en utilisant la force centrifuge
• G01N 29/32 - Dispositions pour supprimer des influences indésirables, p.ex. des variations de température ou de pression

Abrégé

The objective of the present invention is to measure gas concentration with a high degree of accuracy. A gas sensor (10) is provided with: a sensor enclosure (14); an ultrasonic transducer (30) provided at one end of the sensor enclosure (14); an ultrasonic wave reflecting surface (44) which is provided at the other end of the sensor enclosure (14) and which intersects an axial direction of the sensor enclosure (14); and a plurality of ventilation holes (16) provided in a side wall of the sensor enclosure (14). The plurality of ventilation holes (16) are provided in positions such that one side of the sensor enclosure (14) cannot be seen from the other side thereof when viewed from a side surface side of the sensor enclosure (14), and each ventilation hole (16) has a shape extending in the axial direction of the sensor enclosure (14).

Classes IPC  ?

• G01N 29/024 - Analyse de fluides en mesurant la vitesse de propagation ou le temps de propagation des ondes acoustiques
• G01N 29/22 - Recherche ou analyse des matériaux par l'emploi d'ondes ultrasonores, sonores ou infrasonores; Visualisation de l'intérieur d'objets par transmission d'ondes ultrasonores ou sonores à travers l'objet - Détails

Abrégé

The purpose of the present invention is to improve the precision of measuring the propagation time of ultrasonic waves. A processor 28 serving as a computation unit is configured to include a correlation object determination unit 32 for establishing: a first to-be-correlated signal established on the basis of a first upper-limit rate of change, which is the rate of change of an upper-limit envelope of a direct wave signal, and a first lower-limit rate of change, which is the rate of change of a lower-limit envelope of the direct wave signal; and a second to-be-correlated signal established on the basis of a second upper-limit rate of change, which is the rate of change of an upper-limit envelope of a round-trip-delayed wave signal, and a second lower-limit rate of change, which is the rate of change of a lower-limit envelope of the round-trip-delayed wave signal. The processor 28 is also configured to include a correlation processing unit 34 for establishing a correlation value between the first to-be-correlated signal and a signal in which the second to-be-correlated signal is moved on a time axis. The correlation processing unit 34 functions as a propagation time measurement unit for establishing the time difference between the first to-be-correlated signal and the second to-be-correlated signal on the basis of the correlation value, and establishing the time for ultrasonic waves to propagate through a concentration measurement space on the basis of the time difference.

Classes IPC  ?

• G01N 29/024 - Analyse de fluides en mesurant la vitesse de propagation ou le temps de propagation des ondes acoustiques
• G01M 3/24 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide par détection de la présence du fluide à l'emplacement de la fuite en utilisant des vibrations infrasonores, sonores ou ultrasonores
• G01N 29/50 - Traitement du signal de réponse détecté en utilisant des techniques d'autocorrélation ou des techniques d'intercorrélation

Abrégé

The purpose of the present invention is to improve the precision of measuring the propagation time of ultrasonic waves. A gas concentration measurement device comprises: a transmission circuit 38 and a transmission oscillator 16 for transmitting first ultrasonic waves in a concentration measurement space and also transmitting second ultrasonic waves, which continue temporally from the first ultrasonic waves in the concentration measurement space; a reception oscillator 18 and a reception circuit 40 for receiving the ultrasonic waves that have propagated through the concentration measurement space; and a propagation time measurement unit 32 for determining, on the basis of the timings at which the first ultrasonic waves and the second ultrasonic waves were transmitted and the timings at which the first ultrasonic waves and the second ultrasonic waves were received, the time in which ultrasonic waves propagate through the concentration measurement space. The second ultrasonic waves have an opposite phase with respect to that of the first ultrasonic waves, and the amplitude of the second ultrasonic waves is greater than that of the first ultrasonic waves.

Classes IPC  ?

• G01N 29/024 - Analyse de fluides en mesurant la vitesse de propagation ou le temps de propagation des ondes acoustiques
• G01M 3/24 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide par détection de la présence du fluide à l'emplacement de la fuite en utilisant des vibrations infrasonores, sonores ou ultrasonores
• G01N 29/44 - Traitement du signal de réponse détecté

Abrégé

The objective of the present invention is to improve the measuring accuracy of a gas concentration measuring device. A variable value calculating process includes: a step of measuring a propagation time of the propagation of an ultrasound wave through a measurement sector inside a housing 10; a step of obtaining a temperature calculated value on the basis of the measured value of the propagation time and a reference distance for the measurement sector; a step of obtaining a temperature measured value by measuring the temperature inside the housing 10; and a step of obtaining a temperature replacement fluctuation value indicating a difference between the temperature calculated value and the temperature measured value. The variable value calculating process is executed for each of a plurality of temperature conditions under which the temperature of a reference gas inside the housing 10 differs. A temperature compensation table in which the temperature of a gas to be measured is associated with a temperature compensation value relating to the temperature is obtained on the basis of the temperature replacement fluctuation values obtained under each temperature condition.

Classes IPC  ?

• G01N 29/024 - Analyse de fluides en mesurant la vitesse de propagation ou le temps de propagation des ondes acoustiques

Abrégé

An object characteristics measurement apparatus of the invention includes a surface acoustic wave device. The surface acoustic wave device includes: an interdigitated electrode that is formed on a first surface on a piezoelectric substrate, excites an elastic wave, and receives reflection based on the elastic wave; a reflector that has a third surface and a fourth surface between the interdigitated electrode and a second surface orthogonal to the first surface in a propagation direction of the elastic wave, the third surface being formed at a position different from that of the first surface in a normal direction of the first surface, the fourth surface connecting an end of the first surface, which is formed perpendicular to the normal direction of the first surface, to the third surface; a reaction field that is formed between the interdigitated electrode and the reflector, in which the measured object is to be loaded; and a propagator that is formed between the reflector and the second surface. The characteristics of the measured object are determined based on a surface acoustic wave that is separated from an elastic wave and a bulk wave and from a bulk wave where the elastic wave propagates along the reaction field from the interdigitated electrode, is reflected by the fourth surface, and is received by the interdigitated electrode and where the bulk wave is reflected by the second surface and is included in the surface acoustic wave received by the interdigitated electrode.

Classes IPC  ?

• G01N 29/02 - Analyse de fluides

Abrégé

A surface acoustic wave sensor of the invention includes: a piezo element that propagates a surface acoustic wave; an electrode that carries out conversion of an electrical signal and a surface acoustic wave; and a porous base member into which liquid infiltrates and which comes into contact with the piezo element.

Classes IPC  ?

• G01N 29/02 - Analyse de fluides
• G01N 29/00 - Recherche ou analyse des matériaux par l'emploi d'ondes ultrasonores, sonores ou infrasonores; Visualisation de l'intérieur d'objets par transmission d'ondes ultrasonores ou sonores à travers l'objet
• G01N 29/24 - Sondes
• H03H 9/145 - Moyens d'excitation, p.ex. électrodes, bobines pour réseaux utilisant des ondes acoustiques de surface
• H03H 9/25 - Réseaux comprenant des éléments électromécaniques ou électro-acoustiques; Résonateurs électromécaniques - Détails de réalisation de résonateurs utilisant des ondes acoustiques de surface

Abrégé

A surface acoustic wave element and equipment for measuring the physical characteristics of a liquid material without causing short-circuit of an input electrode and an output electrode even if the element or the equipment is immersed into the liquid material of measurement object. The first surface acoustic wave element has input electrodes surrounded by a sealing member having a circumferential wall formed on a piezoelectric substrate, and a top plate covering the circumferential wall, and a sealing reinforcement is formed on the piezoelectric substrate in parallel with a wall to face a material, which is to be measured and loaded on the piezoelectric substrate. The output electrodes are surrounded by a sealing member having a circumferential wall formed of photosensitive resin on the piezoelectric substrate, and a top plate covering the circumferential wall, and a sealing reinforcement is formed on the piezoelectric substrate in parallel with a wall to face the material, which is to be measured and loaded on the piezoelectric substrate.

Classes IPC  ?

• H03H 9/25 - Réseaux comprenant des éléments électromécaniques ou électro-acoustiques; Résonateurs électromécaniques - Détails de réalisation de résonateurs utilisant des ondes acoustiques de surface
• G01N 29/00 - Recherche ou analyse des matériaux par l'emploi d'ondes ultrasonores, sonores ou infrasonores; Visualisation de l'intérieur d'objets par transmission d'ondes ultrasonores ou sonores à travers l'objet
• G01N 29/02 - Analyse de fluides