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Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor

A high-sensitivity, quasi-distributed technology, applied to instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as poor signal-to-noise ratio and low sensitivity, and achieve high strength, high signal strength, and suppression of inter-code The effect of crosstalk

Inactive Publication Date: 2015-12-16
NANJING PIONEER AWARENESS INFORMATION TECH CO LTD
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  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of low sensitivity and poor signal-to-noise ratio of the above-mentioned existing optical fiber sensing system, and propose a high-sensitivity quasi-distributed fiber grating sensor based on digital enhanced interference

Method used

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  • Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0033] First please refer to figure 1 , figure 1 It is a block diagram of the overall structure of a high-sensitivity quasi-distributed fiber grating vibration sensor based on digital enhanced interference. Depend on figure 1 It can be seen that the high-sensitivity quasi-distributed fiber grating vibration sensor based on digital enhanced interference of the present invention comprises a narrow linewidth laser 1, a first fiber coupler 2, an electro-optic modulator 3, an acousto-optic modulator 4, a circulator 5, a weak Reflectivity fiber grating array 6 (cascaded from weak reflectivity grating 1, grating 2..., grating n), second fiber coupler 7, double-balanced detector 8, arbitrary waveform generator 9, electrical amplifier 10, electrical Delay 111, electrical delay 21...

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Abstract

The invention discloses a digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor, which comprises a narrow linewidth laser, a first fiber coupler, an electro-optic modulator, an acousto-optic modulator, a circulator, a weak reflection fiber bragg grating array, a second fiber coupler, a double-balanced detector, an arbitrary waveform generator, an electrical amplifier, n electrical delayers, n multipliers and a phase demodulator, wherein the output port of the narrow linewidth laser is connected with the input port of the first fiber coupler; the first output port of the first fiber coupler is connected with the light signal input end of the electro-optic modulator; the output port of the electro-optic modulator is connected with the light signal input port of the acousto-optic modulator; the light signal output port of the acousto-optic modulator is connected with the first port of the circulator; and the second port of the circulator is connected with the input port of the weak reflection fiber bragg grating array.

Description

technical field [0001] The invention relates to a digital enhanced interference optical fiber sensing technology, in particular to a high-sensitivity quasi-distributed optical fiber grating vibration sensor based on digital enhanced interference. Background technique [0002] Optical fiber sensors have the advantages of strong anti-electromagnetic interference, high sensitivity, corrosion resistance, explosion-proof, flexible optical path, long sensing distance, and easy connection with optical fiber systems. In recent years, it has been widely used in natural gas and oil pipeline safety monitoring, bridge crack monitoring, gas concentration detection, border security and other fields. However, in some occasions that require high-sensitivity detection capabilities, such as sound detection, weak vibration detection, etc., the sensitivity and signal-to-noise ratio of fiber optic sensors have always been its limiting factors. Therefore, it is urgent to improve the sensitivity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 卢斌叶青魏韦
Owner NANJING PIONEER AWARENESS INFORMATION TECH CO LTD
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