Diagnosis apparatus

Patent metadata

Field	Value
Publication number	US-10585017-B2
Application number	US-201816227356-A
Country	US
Kind code	B2
Filing date	Dec 20, 2018
Priority date	Feb 26, 2018
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A diagnosis apparatus includes a fiber optic sensor, a collection processor, and a self-diagnosis processor. The fiber optic sensor is configured to be disposed over a target. The collection processor is configured to perform a collection process that collects measurement data related to the target obtained by the fiber optic sensor. The self-diagnosis processor is configured to perform a self-diagnosis process before the collection processor starts the collection process. The self-diagnosis process obtains an output value related to calibration of the fiber optic sensor, causes the collection processor to start the collection process when the output value falls within a proper range, and outputs an error when the output value falls outside the proper range.

First claim

The invention claimed is:

1. A diagnosis apparatus comprising:
a fiber optic sensor configured to be disposed on a target being a part of a structure, the fiber optic sensor including:
a core through which light passes, and
a grating that has a refractive index different from a refractive index of any other part of the core and allows reflection light having a specific wavelength, out of light having a broadband spectrum, to be reflected from the grating;

a vibrator configured to be disposed on the target and to vibrate the target; and
a circuitry coupled to the fiber optic sensor and the vibrator;
wherein the circuitry is configured to cause a diagnosis process to be executed by:
calculating distortion measured when the target is vibrated by the vibrator and temperature calculated by using the reflection light,
detecting damage in a region from the vibrator to the fiber optic sensor by using the distortion, and
determining that the structure is not healthy when the damage is detected or when the temperature is in a predetermined range; and

wherein the circuitry is configured to cause a self-diagnosis process to be executed by at least one of:
detecting disconnection in the fiber optic sensor when there is no reflection light,
detecting deterioration in an adhesive of the fiber optic sensor on a basis of a stress that acts on the target of the structure, the stress calculated by using a temperature measured by a thermometer and a weight of the structure measured by a weight sensor, and
detecting detachment of an adhesive of the fiber optic sensor on a basis of comparison of a first wavelength of first reflection light with a second wavelength of second reflection light prior to the first reflection light.

2. The diagnosis apparatus according to claim 1 , further comprising a health diagnosis processor configured to diagnose, on a basis of the measurement data collected by the collection processor, a health of a structure that is provided with the fiber optic sensor.

3. A diagnosis apparatus comprising:
a fiber optic sensor configured to be disposed on a target being a part of a structure, the fiber optic sensor including:
a core through which light passes, and
a grating that has a refractive index different from a refractive index of any other part of the core and allows reflection light having a specific wavelength, out of light having a broadband spectrum, to be reflected from the grating;

a vibrator configured to be disposed on the target and to vibrate the target; and
a circuitry coupled to the fiber optic sensor and the vibrator;
wherein the circuitry is configured to cause a diagnosis process to be executed by:
calculating distortion measured when the target is vibrated by the vibrator and temperature calculated by using the reflection light,
detecting damage in a region from the vibrator to the fiber optic sensor by using the distortion, and
determining that the structure is not healthy when the damage is detected or when the temperature is in a predetermined range; and

wherein the circuitry is configured to cause a self-diagnosis process to be executed by:
detecting deterioration in an adhesive of the fiber optic sensor on a basis of a stress that acts on the target of the structure, the stress calculated by using a temperature measured by a thermometer and a weight of the structure measured by a weight sensor, and
detecting detachment of an adhesive of the fiber optic sensor on a basis of comparison of a first wavelength of first reflection light with a second wavelength of second reflection light prior to the first reflection light.

4. A diagnosis apparatus comprising:
a fiber optic sensor configured to be disposed on a target being a part of a structure, the fiber optic sensor including:
a core through which light passes, and
a grating that has a refractive index different from a refractive index of any other part of the core and allows reflection light having a specific wavelength, out of light having a broadband spectrum, to be reflected from the grating;

a vibrator configured to be disposed on the target and to vibrate the target; and
a circuitry coupled to the fiber optic sensor and the vibrator;
wherein the circuitry is configured to cause a diagnosis process to be executed by:
calculating distortion measured when the target is vibrated by the vibrator and temperature calculated by using the reflection light,
detecting damage in a region from the vibrator to the fiber optic sensor by using the distortion, and
determining that the structure is not healthy when the damage is detected or when the temperature is in a predetermined range; and

wherein the circuitry is configured to cause a self-diagnosis process to be executed by:
detecting disconnection in the fiber optic sensor when there is no reflection light, and
detecting detachment of an adhesive of the fiber optic sensor on a basis of comparison of a first wavelength of first reflection light with a second wavelength of second reflection light prior to the first reflection light.

5. A diagnosis apparatus comprising:
a fiber optic sensor configured to be disposed on a target being a part of a structure, the fiber optic sensor including:
a core through which light passes, and
a grating that has a refractive index different from a refractive index of any other part of the core and allows reflection light having a specific wavelength, out of light having a broadband spectrum, to be reflected from the grating;

a vibrator configured to be disposed on the target and to vibrate the target; and
a circuitry coupled to the fiber optic sensor and the vibrator;
wherein the circuitry is configured to cause a diagnosis process to be executed by:
calculating distortion measured when the target is vibrated by the vibrator and temperature calculated by using the reflection light,
detecting damage in a region from the vibrator to the fiber optic sensor by using the distortion, and
determining that the structure is not healthy when the damage is detected or when the temperature is in a predetermined range; and

wherein the circuitry is configured to cause a self-diagnosis process to be executed by at least one of:
detecting disconnection in the fiber optic sensor when there is no reflection light, and
detecting deterioration in an adhesive of the fiber optic sensor on a basis of a stress that acts on the target of the structure, the stress calculated by using a temperature measured by a thermometer and a weight of the structure measured by a weight sensor.

Assignees

• Subaru Corp

Inventors

• Soejima Hideki

Classifications

• G01D5/35316

  using a Bragg gratings · CPC title

• G01J3/1895

  using fiber Bragg gratings or gratings integrated in a waveguide · CPC title

• G01M11/00

  Testing of optical apparatus; Testing structures by optical methods not otherwise provided for · CPC title

• G07C3/00 Primary

  Registering or indicating the condition or the working of machines or other apparatus, other than vehicles · CPC title

• G01M11/083 Primary

  by using an optical fiber in contact with the device under test [DUT] · CPC title