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A multipurpose fiber optic sensor

A fiber optic sensor and multi-purpose technology, which is applied in the direction of transmitting sensing components with optical devices, can solve the problems of variable frequency, difficulty in filtering, and influence of signal phase-frequency characteristics, etc., and achieves small phase detection error and application Wide range of occasions and reliable results

Inactive Publication Date: 2019-09-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the high-frequency component itself will affect the phase detection of the cosine wave (the position of the zero-crossing point changes); The electrical characteristics are equivalent to capacitance, and the voltage at both ends cannot jump, so the falling edge of the sawtooth wave cannot be infinitely short) and the elasticity of the optical fiber itself and many other factors, the frequency is variable, and it is difficult to filter out cleanly; and , when using a filter, in addition to affecting the amplitude-frequency characteristics of the output signal, it will also affect the phase-frequency characteristics of the signal at the same time, that is, the phase of the filter will be affected near the cut-off frequency, which is very important for relying on phase changes. It is very unfavorable for fiber optic sensors that measure changes in physical quantities such as stress or temperature

Method used

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  • A multipurpose fiber optic sensor
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 Overall structure of the present invention

[0029] Such as figure 1 As shown, the overall structure of the present invention has, the pump source 1 (980nm laser, maximum output power is 1W) is connected with the 980nm end of the optical wavelength division multiplexer 2 (980 / 1550nm wavelength division multiplexer), and the optical wavelength division multiplexer The 1550nm end of device 2 is connected with one end of the optical fiber wound on the first piezoelectric ceramic 11 (cylindrical piezoelectric ceramic, outer diameter 50mm, inner diameter 40mm, height 50mm), and the optical fiber wound on the first piezoelectric ceramic 11 The other end of the first optical isolator 10 (1550nm polarization-independent optical isolator) is connected to the input end, and the control end of the first piezoelectric ceramic 11 is connected to the first PZT drive circuit 12 (the device made by this research group, the specific structure is shown in The output port of...

Embodiment 2

[0031] Embodiment 2 function conversion circuit

[0032] Such as figure 2As shown, the structure of the function conversion circuit 26 used in the present invention is that one end of the capacitor C3 is connected to the pin 12 of the trigonometric function converter U1 and one end of the resistor R2, and the other end of the capacitor C3 is used as the input end of the function conversion circuit 26 , recorded as the port ACOS_in, connected to the output end of the photoelectric conversion circuit 25; the other end of the resistor R2 is grounded; the pins 2, 3, 4, 5, 8, 11, and 13 of the trigonometric function converter U1 are grounded, and the pins 9, 10 is connected to one end of capacitor C2 and -12V power supply, and the other end of capacitor C2 is grounded; pin 6 of trigonometric function converter U1 is connected to pin 7, pin 16 is connected to +12V power supply and one end of capacitor C1, capacitor C1 The other end of the trigonometric function converter U1 is con...

Embodiment 3

[0033] Embodiment 3 Adaptive Amplitude Normalization Circuit

[0034] Because the signal amplitude of the function conversion circuit 26 output is relatively small, and is affected by multiple parameters in the optical path and the circuit, the size is indefinite, so the present invention has designed an adaptive amplitude normalization circuit 27, which is used for the signal output by the function conversion circuit 26 The amplitude is normalized to the optimal size to further improve the accuracy of demodulation. The specific structure is that one end of the capacitor C11 is connected to one end of the resistor R21 and the pin 3 of the chip U2, the other end of the resistor R21 is grounded, and the other end of the capacitor C11 is used as the input end of the adaptive amplitude normalization circuit 27, which is recorded as the port ADAPT_in , is connected with the port ACOS_out of the function conversion circuit 26; the pin 1, the pin 7, the pin 8 and the pin 14 of the ch...

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Abstract

The invention discloses a multipurpose fiber sensor and belongs to the technical field of a fiber sensor. A main structure of the multipurpose fiber sensor comprises a pump source (1), an optical wavelength division multiplexer (2), an erbium-doped fiber (3) and the like. According to the multipurpose optical fiber sensor, a sinusoidal signal is taken as a modulation signal and high frequency interference is not generated. The multipurpose fiber sensor is characterized by relatively reliable working, high sensing precision and wide application range.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, in particular to a multipurpose optical fiber sensor. Background technique [0002] Fiber Bragg grating (FBG) is widely used in the field of sensing technology due to its advantages of anti-electromagnetic interference, chemical resistance, small transmission loss, small size and light weight, and easy mass production. Especially in micro-stress detection, temperature detection in harsh environments, etc., fiber optic sensors have unique advantages. On the one hand, very small changes in temperature or stress can be detected sensitively by fiber Bragg gratings, with high sensitivity. On the one hand, in harsh environments such as humidity and strong electromagnetic interference, the fiber Bragg grating is not easy to damage, the working performance is not affected, and the signal transmission is not disturbed. These advantages make Bragg fiber grating sensors widely used in bridges...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
Inventor 汝玉星杨忠岗孙茂强于广安毕琳旭
Owner JILIN UNIV
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