Implementation of a dual Fabry-Perot photonic pressure sensor

    公开(公告)号:US11821801B1

    公开(公告)日:2023-11-21

    申请号:US16745671

    申请日:2020-01-17

    CPC classification number: G01L1/02 G01C19/727 G01N21/45 G02B27/10

    Abstract: In an aspect, a pressure sensor for determining pressure in an environment comprises: a source for emitting a coherent reference light characterized by a reference light frequency; a first lock-in mechanism configured to send an electrical signal to the source based on a reference resonance frequency; a reference cavity; wherein the reference cavity is characterized by the reference resonance frequency; a modulator configured a reference light to generate at least a first sideband frequency such that an output of said modulator is a measurement light characterized by at least the first sideband frequency; a frequency synthesizer configured to drive the modulator; a second lock-in mechanism configured to send an electrical signal to the frequency synthesizer based on a measurement resonance frequency; and a measurement cavity configured to receive at least a portion of the measurement light; wherein the measurement cavity is characterized by the measurement resonance frequency; and wherein the pressure of the environment is determined based on the reference resonant frequency and the measurement resonance frequency.

    COLLISION DETECTION APPARATUS
    185.
    发明申请

    公开(公告)号:US20230096952A1

    公开(公告)日:2023-03-30

    申请号:US17934223

    申请日:2022-09-22

    Inventor: Kentaro YAMAMOTO

    Abstract: A collision detection apparatus includes a bumper beam, an absorber, a collision detection sensor, and a bumper cover. The bumper beam extends in a vehicle width direction. The absorber is disposed adjacent to a vehicle front side of the bumper beam. The collision detection sensor includes a pressure tube extending in the vehicle width direction and held by the absorber and is configured to output a signal corresponding to a pressure change in the pressure tube. The bumper cover is disposed on a vehicle front side of the absorber. The bumper cover includes: a low rigidity part disposed at a position lower than the pressure tube; and a high rigidity part having a bending rigidity higher than a bending rigidity of the low rigidity part, disposed at a position above the low rigidity part, and having an upper end at a position higher than the pressure tube.

    STRESS ESTIMATION METHOD FOR MACHINE STRUCTURE AND MONITORING METHOD FOR MACHINE STRUCTURE

    公开(公告)号:US20230084695A1

    公开(公告)日:2023-03-16

    申请号:US17930024

    申请日:2022-09-06

    Abstract: A stress estimation method for a machine structure according to an embodiment is provided with a calculation step of calculating a relationship between the stress generated at the evaluation target position and a physical quantity including a sound pressure or vibration generated at a detection position different from the evaluation target position during vibration of the machine structure. The stress estimation method for a machine structure is provided with a detection step of detecting the physical quantity generated at the detection position during operation of the machine structure. The stress estimation method for a machine structure is provided with an estimation step of estimating the stress generated at the evaluation target position during operation of the machine structure on the basis of the relationship calculated in the calculation step and the physical quantity detected in the detection step.

    Vehicle load metering device
    188.
    发明授权

    公开(公告)号:US10996098B2

    公开(公告)日:2021-05-04

    申请号:US16504732

    申请日:2019-07-08

    Abstract: A vehicle load metering device has a displacement sensing module, a signal processing/transmission module, and a signal receiving/processing module. The displacement sensing module has multiple displacement sensors respectively mounted on flexible supporting devices of a vehicle suspension system. Each displacement sensor is connected to two supporting boards of the corresponding flexible supporting device to meter amount of displacement between the two supporting boards. The signal processing/transmission module transmits the signals that are detected by the displacement sensors to the signal receiving/processing module. The present invention provides a vehicle load metering device that may assemble on the vehicle conveniently and detect the load of the vehicle accurately.

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