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A fiber optic efpi ultrasonic sensor

A sensor and ultrasonic technology, applied in the direction of measuring ultrasonic/sonic/infrasonic waves, instruments, using wave/particle radiation, etc., can solve problems such as inaccurate measurement results, temperature drift, etc., to improve accuracy and reliability, and simple structure , The effect of facilitating engineering construction and installation

Active Publication Date: 2019-09-13
ZHUHAI YADO MONITORING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the existing EFPI sensor structure has temperature sensitivity, when used for ultrasonic detection, when the working environment temperature changes, serious temperature drift will occur, resulting in inaccurate measurement results

Method used

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  • A fiber optic efpi ultrasonic sensor
  • A fiber optic efpi ultrasonic sensor
  • A fiber optic efpi ultrasonic sensor

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Embodiment Construction

[0025] The structure and working principle of the optical fiber EFPI ultrasonic sensor involved in the present invention will be further elaborated below with specific embodiments:

[0026] see Figure 1 to Figure 3 As shown, a fiber optic EFPI ultrasonic sensor 30 is provided in this embodiment, including a sensor head unit 20 and a sensor body unit, the sensor body unit includes a sensor sheath 9, and the sensor head unit 20 is arranged on the sensor sheath 9 Inside, the sensor head unit 20 includes a capillary 3 and a part of the optical fiber 1 arranged in the capillary 3 and a ferrule bracket 2 for fixing the optical fiber 1, and a film for sensing ultrasonic vibration is also arranged on one end of the capillary 3 A sheet 4, the inner surface 13 of the diaphragm 4, the front end surface 12 of the optical fiber 1 and the inner surface of the capillary 3 are jointly defined to form a Fabry-Pérot cavity 11, and the front end surface 12 of the optical fiber 1 constitutes the...

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Abstract

The present invention discloses an optical fiber EFPI ultrasonic sensor, which comprises a sensor head unit and a sensor body unit. The sensor body unit includes a sensor sheath. The sensor head unit is arranged inside the sensor sheath. The sensor head unit comprises a capillary tube, an optical fiber, and a pullover bracket used for fixing the optical fiber. One part of the optical fiber is arranged in the capillary tube. One end of the capillary tube is provided with a diaphragm used for sensing the vibration of ultrasonic waves. The inner surface of the diaphragm, the front end surface of the optical fiber and the inner surface of the capillary tube together define a Fabry-perot cavity. The front end surface of the optical fiber forms the first reflective surface of the Fabry-perot cavity. The inner surface of the diaphragm forms the second reflective surface of the Fabry-perot cavity. The optical fiber EFPI ultrasonic sensor is capable of efficiently responding to ultrasonic wave signals and then collecting the signals, and is high in sensitivity and measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of optical fiber ultrasonic sensors, in particular to a temperature self-compensating ultrasonic sensor based on optical fiber EFPI (extrinsic Fabry-Perot interferometer, external cavity Fabry-Perot interferometer) technology. The sensor can be used to collect ultrasonic signals in liquids, monitor the frequency and intensity of ultrasonic signals and other information, and has the ability to adapt to environmental temperature changes. The effect of auto-regulation has the excellent characteristic of keeping the cavity length constant. Background technique [0002] At present, there are many methods for ultrasonic signal monitoring of industrial equipment at home and abroad. The piezoelectric ultrasonic detection method is the most popular method, but the sensor is attached to the equipment shell, and the ultrasonic signal inside the detection equipment is not easily disturbed by electromagnetic noise. , bu...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 杨志强王伟郭晨华
Owner ZHUHAI YADO MONITORING TECH CO LTD
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