Abrégé

The present invention relates to a MEMS deformation sensor for measuring a relative movement between two regions of a structure, the sensor comprising: - a first portion (2) and a second portion (3) that are movable with respect to one another along a direction of measurement (X); - a thrust element (4) mounted fixed with respect to the first portion; - a first electrode (A) and a second electrode (B) that are capable of being raised to different electrical potentials, each mounted fixed with respect to the second portion; - a connecting portion (I) forming an electrical link between the first electrode and the second electrode, the thrust element applying a load to the connecting portion when the first portion moves with respect to the second portion along the direction of measurement beyond a predetermined distance, the electrical link being broken under the effect of the load.

Classes IPC  ?

• G01B 7/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques électriques ou magnétiques pour mesurer les déformations dans un solide, p.ex. au moyen d'une jauge de contrainte à résistance

Abrégé

A passive strain sensor (C2) includes a system for detecting a variation in the distance between two points or regions of a structure, and a carrier (1) having first and second portions (1a, 1b) configured for attachment to said points or regions. Said system comprises a measuring assembly (13) carried by the first portion (1a) and actuatable only in one measurement direction to measure and store a measurement associated with at least one strain in a measurement direction, and an actuating device (12) comprising an intermediate assembly (15) with an actuating member (15c) of the measuring assembly (13), and an actuating assembly (14) having a push portion (14c) opposite the intermediate assembly (15) and configured such that the actuating member (15c) is moved relative to the measuring assembly (13) only when the second portion (1b) moves in the measurement direction.

Classes IPC  ?

• G01B 5/14 - Dispositions pour la mesure caractérisées par l'utilisation de techniques mécaniques pour mesurer une distance ou une marge entre des objets ou des ouvertures espacés
• G01B 5/30 - Dispositions pour la mesure caractérisées par l'utilisation de techniques mécaniques pour mesurer la déformation dans un solide, p.ex. indicateur de déformation mécanique

Abrégé

The invention relates to a method for counting events occurring during a period T carried out by a mechanical counter comprising two toothed wheels with the same pitch, the occurrence of an event causing the rotation of each wheel by an angle corresponding to the pitch of the teeth thereof, said method comprising: a first step of counting or calculating, for each wheel at the end of T, the difference in the number of teeth between the initial and final position thereof, said step being at least partially carried out either by optical means, requiring the presence on each wheel of at least one marker, or by means for measuring the angular displacement of each wheel and associated calculation means; and a second step of calculating the number of occurred events N in accordance with the difference between the values counted or measured and in accordance with the number of teeth of the wheels.

Classes IPC  ?

• G06M 1/06 - Caractéristiques d'ordre général pour entraîner l'étage du rang le plus bas produisant une révolution continue de l'étage, p.ex. avec train d'engrenage

Abrégé

The invention relates to a micro-sensor comprising: a substrate comprising a first portion and a second portion; a third portion and fourth portion provided between said portions and connected to the first portion and the second portion respectively by an elastic member; detection and counting means comprising: a counting gear, a third beam capable of meshing with the gear, means for amplifying the value of a relative movement between said portions and comprising: a first beam attached at one end thereof to the third portion and at the other end thereof to a plate, a second beam attached at one end thereof to the fourth portion and at the other end thereof to said plate, the third beam being attached on one side to the plate and comprising a tooth capable of meshing with said gear.

Classes IPC  ?

• G01D 1/04 - Dispositions pour la mesure donnant des résultats autres que la valeur instantanée d'une variable, d'application générale donnant des valeurs intégrées
• G01B 5/30 - Dispositions pour la mesure caractérisées par l'utilisation de techniques mécaniques pour mesurer la déformation dans un solide, p.ex. indicateur de déformation mécanique
• G01D 5/04 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensible; Moyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminé; Transducteurs non spécialement adaptés à une variable particulière utilisant des moyens mécaniques utilisant des engrenages
• G06M 1/04 - Caractéristiques d'ordre général pour entraîner l'étage du rang le plus bas
• G06M 3/00 - Compteurs avec possibilités supplémentaires
• G08G 1/065 - Systèmes de commande du trafic pour véhicules routiers par comptage des véhicules dans une section de la route ou dans un parc de stationnement, c. à d. en comparant le nombre des arrivants et celui des partants

Abrégé

The present invention relates to the field of microsensors, and specifically to a passive, reversible deformation sensor, particularly a sensor for detecting deformation cycles in a direction OX of a structure, specifically during cycles of temperature or mechanical stresses to which said structure is subjected, said sensor comprising a means (4, 5, 6) for detecting and, preferably, counting cycles of variations in the distance between two points or areas of a structure, said means comprising a substrate having first and second portions (41, 44) capable of being attached to said two points or areas of the structure, respectively, the detection means being combined with each of said first and second portions of the substrate, characterized in that the detection means comprises means (541, 542, 543, 551, 552, 553, 561, 562, 563) for distinguishing between at least two different thresholds of cycles of variations in distance.

Classes IPC  ?

• G01B 3/30 - Barres, blocs, ou bandes où la distance entre deux faces est fixe, mais peut être réglée à l'avance, p.ex. calibres de longueur, calibres d'épaisseur
• G01B 7/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques électriques ou magnétiques pour mesurer les déformations dans un solide, p.ex. au moyen d'une jauge de contrainte à résistance