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Optical fiber ultrasonic sensor with high signal to noise ratio based on polytetrafluoroethylene (PTFE) film

An ultrasonic sensor, polytetrafluoroethylene technology, applied in the direction of measuring ultrasonic/sonic/infrasonic waves, using sound waves/ultrasonic/infrasonic waves to analyze solids, instruments, etc., can solve the problems of reducing the acoustic response range, high cost, broadening, etc., and achieve improvement Ultrasonic response range, strong corrosion resistance, and the effect of improving the sideband slope

Active Publication Date: 2018-01-09
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional piezoelectric ceramic transducer (PZT) has the following disadvantages: its material will be damaged in a high temperature and strong corrosion environment, and it is extremely susceptible to environmental electromagnetic field interference, so it is not suitable for working in harsh environments with strong electromagnetic fields such as large electromechanical equipment; Sensitive response to narrow-band ultrasonic signals; its sensitivity will weaken as the volume of the transducer decreases and is greatly affected by capacitance; the received signal will broaden as the distance between the transmitting source and the receiver increases, resulting in signal distortion; multiplexing The performance is poor, and the multi-channel real-time monitoring system is complicated, which further restricts its use
In 2009, Morris P et al. designed a F-P ultrasonic hydrophone consisting of a gold-plated film on both sides of the parylene layer placed on the end face of a single-mode optical fiber; in 2013, Wonuk Jo produced a fiber optic acoustic wave based on a photonic crystal film. Sensors, Ma et al. proposed a fiber optic acoustic wave sensor based on multilayer graphene films; in 2014, Xu F et al. designed a fiber optic acoustic pressure sensor based on silver films; but for films of these materials, the preparation process is complex , high cost, low chemical stability and temperature resistance limit its long-term use in harsh environments, and high Young's modulus reduces its acoustic response range

Method used

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  • Optical fiber ultrasonic sensor with high signal to noise ratio based on polytetrafluoroethylene (PTFE) film
  • Optical fiber ultrasonic sensor with high signal to noise ratio based on polytetrafluoroethylene (PTFE) film
  • Optical fiber ultrasonic sensor with high signal to noise ratio based on polytetrafluoroethylene (PTFE) film

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0024] Such as figure 1 As shown, a fiber optic ultrasonic sensor with high signal-to-noise ratio based on polytetrafluoroethylene film includes a standard single-mode fiber 1, and a section of graded-index multimode fiber 2 is welded to one end of the standard single-mode fiber 1 to form a fiber collimator. The end face of the collimator and the PTFE film 5 constitute the two reflecting surfaces of the F-P interferometer. The PTFE film is used as the ultrasonic response medium. The PTFE film 5 is pasted on one end of the aluminum tube 4, and the aluminum tube 4 is provided with a organic glass tube 3 inside.

[0025] The distance between the end face of the plexiglass tube 3 and the PTFE film 5 is not less than 3mm, the optical fiber collimator penetrates into the plexiglass tube ...

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Abstract

The invention discloses an optical fiber ultrasonic sensor with a high signal to noise ratio based on a polytetrafluoroethylene (PTFE) film. The optical fiber ultrasonic sensor comprises a standard single-mode fiber, wherein one section of multimode fiber with gradient index is in fusion welding with one end of the standard single-mode fiber to form an optical fiber collimator; the end face of theoptical fiber collimator and the PTFE film form two reflecting surfaces of an F-P interferometer; the PTFE film is used as a response media of ultrasonic waves and is stuck at one end of an aluminumtube; an organic glass tube is arranged inside the aluminum tube; and a moving part is fixed with AB glue. The optical fiber ultrasonic sensor disclosed by the invention has the advantages of small size, low cost, simplicity and convenience in production, excellent ultrasonic response and high signal to noise ratio. The optical fiber ultrasonic sensor disclosed by the invention is applied to scanning imaging of a seismic physical model, a multilayer model structure can be distinctly differentiated and a model ultrasonic image is reconstructed, which shows that the optical fiber ultrasonic sensor has potentials in the fields of structural health monitoring, biomedicine and the like. With higher temperature resistance and corrosion resistance, the optical fiber ultrasonic sensor also can beapplied to severe environments such as high-temperature ultrasonic flaw detection.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to an optical fiber ultrasonic sensor with high signal-to-noise ratio based on a polytetrafluoroethylene film. Background technique [0002] The basic sensing principle of the film-based optical fiber Fabry-Perot ultrasonic sensor is that ultrasonic waves act on the film to cause film vibration and film thickness changes, resulting in changes in the length of the F-P cavity and shifting the hypotenuse of the F-P interference spectrum. By detecting the hypotenuse of the spectrum The drift amount can know the amplitude of the ultrasonic wave. The traditional piezoelectric ceramic transducer (PZT) has the following disadvantages: its material will be damaged in a high temperature and strong corrosion environment, and it is extremely susceptible to environmental electromagnetic field interference, so it is not suitable for working in harsh environments with str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G01S15/89G01H9/00
Inventor 乔学光王若晖张雯露
Owner NORTHWEST UNIV(CN)
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