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Pressure measurement system and method based on optical fiber

A measurement system and pressure technology, applied in the field of optical fiber-based pressure measurement systems, can solve the problems of complex process and assembly, high processing cost, poor mechanical properties, etc. Effect

Pending Publication Date: 2022-07-29
ZHEJIANG LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fiber optic pressure sensors are generally based on the principle of Fabry-Perot interference or the principle of light transmission and reflection intensity. They either have complex processes and assemblies, high processing costs, or require additional pressure or reflection diaphragms, and are slightly larger. In addition, they Quartz optical fiber is often used, and its mechanical properties are poor. It has certain application limitations in application scenarios such as flexible tactile and wearable sensors.

Method used

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  • Pressure measurement system and method based on optical fiber
  • Pressure measurement system and method based on optical fiber
  • Pressure measurement system and method based on optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] see figure 1 , an optical fiber-based pressure measurement system comprising:

[0076] The light source 101 adopts a narrow-band infrared LED; the constant current driver 102, the optical fiber sensor 104, and the optical fiber sensor 104 surrounds an optical fiber ring 108 with a radius of 1 mm, so that the curvature of the optical fiber changes, and is cured in the flexible material silica gel, when the light passes through the optical fiber When the ring 108 is placed, part of the light is refracted out of the optical fiber and lost, the photodiode 105, the signal acquisition and amplification circuit 106, the filter 107, the analog-to-digital converter 109, the analog-to-digital converter 109 is an ADC, and the processor 103;

[0077] The constant current driver 102, the light source 101, the optical fiber sensor 104, the photodiode 105, the signal acquisition and amplification circuit 106, the filter 107, the ADC 109, and the processor 103 are sequentially connecte...

Embodiment 2

[0091] see Figure 4 , an optical fiber-based pressure measurement system comprising:

[0092] The light source 401, the constant current driver 402, the first fiber sensor 404 and the second fiber sensor 405 are used as fiber sensors. The axes of the first fiber sensor 404 and the second fiber sensor 405 are perpendicular to each other, that is, the first fiber sensor 404 and the second fiber The optical fiber ring 411 wound by the sensor 405 is enveloped into a spherical surface, and is cured together with a flexible material such as silica gel. The first photodiode 406 and the second photodiode 407 are used to measure the output light intensity of the optical fiber ring 411. Filter 409, analog-to-digital converter 410 is ADC, processor 403;

[0093] Step S1: the illumination light emitted by the light source 401 is transmitted to the first photodiode 406 and the second photodiode 407 through the first optical fiber sensor 404 and the second optical fiber sensor 405, respec...

Embodiment 3

[0103] see Figure 5 , In many application scenarios, it is often necessary to measure the pressure distribution of a plane, such as the foot pressure distribution of a biped robot or the manipulator of a robot to judge the surface of a rigid object. At this time, the fiber optic sensor can easily form a sensor matrix to measure the sensor matrix. pressure distribution on.

[0104] An optical fiber-based pressure measurement system comprising:

[0105] A plurality of light sources 501, and the light sources 501 are infrared LEDs, a constant current driver 502, and a sensor matrix composed of 4*4 fiber optic sensors 503, used to measure pressure distribution or rigid body edges, each light source 501 corresponds to a fiber optic sensor 503, each The optical fiber sensors 503 are all wound with optical fiber rings and photodiodes 504. Each optical fiber sensor 503 corresponds to a photodiode 504. The signal acquisition and processing circuit 505 includes a signal acquisition and ...

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Abstract

The invention discloses a pressure measurement system and method based on an optical fiber. The system comprises a light source, a constant current driver, an optical fiber sensor, an optical fiber ring, a photodiode, a signal acquisition amplifier, a filter, an analog-to-digital converter and a processor. The light source, the constant current driver, the optical fiber sensor, the photodiode, the signal acquisition amplifier, the filter, the analog-to-digital converter and the processor are wound around the optical fiber sensor. S1, illuminating light emitted by a light source is transmitted to a photodiode through an optical fiber sensor; s2, applying pressure to the optical fiber ring, and converting the applied illumination light into a current signal through a photodiode; s3, the signal acquisition amplifier converts the acquired current signal into a voltage signal and amplifies the voltage signal; s4, the filtered voltage signal is subjected to analog-to-digital conversion through an analog-to-digital converter, a current voltage value is output, and a current pressure value is determined. The invention has the advantages of simple assembly and good mechanical properties, and is suitable for application scenarios such as flexible tactile and wearable sensors.

Description

technical field [0001] The present invention relates to the technical field of optical fiber sensors, and in particular, to an optical fiber-based pressure measurement system and method. Background technique [0002] With the development of artificial intelligence and informatization digital technology, the society's demand for high-performance and high-reliability pressure sensors is increasing. Compared with traditional pressure sensors based on electrical principles, optical fiber pressure sensors have the advantages of small size, light weight, anti-electromagnetic interference, high sensitivity, electrical safety, etc., and have been researched and developed. The optical fiber pressure sensor converts the measured physical quantity into the intensity, phase and wavelength of the optical signal by using the characteristics of the optical fiber itself. At present, optical fiber pressure sensors are generally based on the principle of Fabry-Perot interference or based on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/242
Inventor 王晓坤周训强李楠
Owner ZHEJIANG LAB
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