Non-contact type fiber ultrasonic sensor

An ultrasonic sensor, non-contact technology, applied in the field of sensors, can solve problems such as difficult to correctly obtain discharge signals, electrical pulse signal interference, etc., and achieve good response characteristics and high spectral signal-to-noise ratio

Inactive Publication Date: 2017-02-22
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electric pulse method is the basis of partial discharge research, the electric pulse signal will have a lot of interference (usually above several thousand PCs) when it is detected in the field, and it is difficult to obtain the discharge signal correctly. In addition, the problem of online calibration and online results Equivalence with offline results and other issues

Method used

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  • Non-contact type fiber ultrasonic sensor
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  • Non-contact type fiber ultrasonic sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0019] exist figure 1 Among them, the non-contact optical fiber ultrasonic sensor of this embodiment is composed of an optical fiber mounting ring 1, an optical fiber fixing tube 2, a single-mode optical fiber 3, an optical fiber collimating mirror 4, a reflecting mirror 5, a sensing film 6, and a hollow plug 7.

[0020] The shape of the optical fiber installation ring 1 is a ring body. In the central plane of the height of the side wall of the optical fiber installation ring 1, an optical fiber fixing tube 2 is installed radially on the left side through threaded connection, and a single-mode optical fiber 3 and an optical fiber Collimating mirror 4, the center line of single-mode optical fiber 3 and fiber collimating mirror 4 coincide, the length of the fiber collimating mirror 4 of the present embodiment is 8mm, the wavelength of fiber collimating mirror 4 is 1560nm, and the fiber collimating mirror 4 A transflective film with a light transmittance of 50% is vacuum-evaporat...

Embodiment 2

[0022] In the central plane of the side wall height of the optical fiber installation ring 1, an optical fiber fixing tube 2 is mounted radially on the left side through threaded connection, and a single-mode optical fiber 3 and an optical fiber collimator 4 are installed in the optical fiber fixing tube 2, and the single-mode optical fiber 3 and the optical fiber The centerlines of the collimator mirror 4 coincide, the length of the collimator mirror 4 is 5mm, the wavelength of the collimator mirror 4 is 1560nm, the right end surface of the collimator mirror 4 is vacuum-deposited with a light transmittance of 50%. The semi-transparent and semi-reflective film, the single-mode optical fiber 3 is clamped on the optical fiber fixing tube 2, and the right end of the single-mode optical fiber 3 is bonded to the left end surface of the optical fiber collimator 4 with optical glue. In the central plane of the height of the inner wall of the optical fiber installation ring 1, the radi...

Embodiment 3

[0025] In the central plane of the side wall height of the optical fiber installation ring 1, an optical fiber fixing tube 2 is mounted radially on the left side through threaded connection, and a single-mode optical fiber 3 and an optical fiber collimator 4 are installed in the optical fiber fixing tube 2, and the single-mode optical fiber 3 and the optical fiber The centerlines of the collimator mirror 4 coincide, the length of the collimator mirror 4 is 10mm, the wavelength of the collimator mirror 4 is 1560nm, the right end surface of the collimator mirror 4 is vacuum-deposited with a light transmittance of 50%. The semi-transparent and semi-reflective film, the single-mode optical fiber 3 is clamped on the optical fiber fixing tube 2, and the right end of the single-mode optical fiber 3 is bonded to the left end surface of the optical fiber collimator 4 with optical glue. In the central plane of the height of the inner wall of the optical fiber installation ring 1, the rad...

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Abstract

The invention provides a non-contact type fiber ultrasonic sensor. The side wall height central plane of a fiber installation ring is provided at its left side with a fiber fixing tube in the radial direction. The fiber fixing tube is provided therein with a single-mode fiber and a fiber collimating mirror superposing the central line. The right end of the single-mode fiber is mounted at the left end face of the fiber collimating mirror; the inner side wall height central plane is provided at its right side with a reflection mirror. The reflection mirror forms an angle of 45 degrees with the horizontally incoming laser beams; the lower end of the fiber installation ring is provided with a hollow plug; and the upper end of the hollow plug inside the fiber installation ring is provided with a sensing diaphragm. According to the testing, the non-contact type fiber ultrasonic sensor of the invention responds well, stably and sensitively to the ultrasonic signals in 300KHz wave band. In a real-time acquisition mode, the spectral signal to noise ratio is high, making it suitable to detect the ultrasonic waves generated by partial discharge of a transformer and to acquire ultrasonic waves in real time.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to ultrasonic sensors. Background technique [0002] The power transformer is an important electrical equipment in the power system. It is in a pivotal position in the power system. Once a fault occurs, a large-scale power outage may occur, which will bring great losses to the power system and the national economy. Therefore, the power system attaches great importance to the power transformer. state, especially the health of its insulating media. Since the insulation structure of power transformers usually adopts oil-immersed composite insulation with good insulation performance, with the development of power systems and the increase of voltage levels, partial discharge has become an important cause of insulation degradation of power transformers, so the detection and evaluation of partial discharges is also important. It has become an important means of monitoring its ...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01H9/00
CPCG01H9/006G01R31/1209
Inventor 冯忠耀郝永鑫周瑞祥荣强周
Owner NORTHWEST UNIV
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