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Micro stress sensor based on phase comparison

A phase comparison and micro-stress technology, applied in instruments, measurement force, and force measurement by measuring the change of optical properties of materials under stress, etc. question

Inactive Publication Date: 2019-01-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 disadvantageous for fiber optic sensors that measure changes in stress

Method used

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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, pumping source 1 (VENUS series 980nm high-power single-mode pumping light source of Shanghai Knet Laser Technology Co., Ltd., the model is VLSS-980-B, and the maximum single-mode output optical power is 1200mW) is connected to the 980nm end of the optical wavelength division multiplexer 2 (the fusion tapered 980 / 1550nm pump optical wavelength division multiplexing coupler produced by Shanghai Hanyu Optical Fiber Communication Technology Co., Ltd.), and the 1550nm end of the optical wavelength division multiplexer 2 Connect with one end of the optical fiber wound on the first piezoelectric ceramic 11 (1310 / 1480 / 1550nm polarization-independent optical isolator produced by Shanghai Hanyu Optical Fiber Communication Technology Co., Ltd.), and the optical fiber wound on the first piezoelectric ceramic 11 The other end is connected ...

Embodiment 2

[0031] Embodiment 2 function conversion circuit

[0032] The structure of the function conversion circuit 25 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 25, which is denoted as the port ACOS_in , is connected with the output end of the second photoelectric conversion circuit 24; the other end of the resistor R2 is grounded; the pins 2, 3, 4, 5, 8, 11, 13 of the trigonometric function converter U1 are grounded, and the pins 9, 10 are connected to the capacitor One end of C2 is connected to -12V power supply, 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, and the other end of capacitor C1 Grounding; pin 1 of the trigonometric function converter U1 is connecte...

Embodiment 3

[0033] Embodiment 3 Adaptive Amplitude Normalization Circuit

[0034] Because the amplitude of the signal output by the function conversion circuit 25 is 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 26, which is used to convert the signal output by the function conversion circuit 25 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 26, which is recorded as the port ADAPT_in , is connected with the port ACOS_out of the function transformation circuit 25; the pin 1, the pin 7, the pin 8, and the pin 14 o...

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Abstract

The invention provides a micro stress sensor based on phase comparison, and belongs to the technical field of optical fiber sensors. The main structure of the micro stress sensor comprises a pumping source (1), an optical wavelength division multiplexer (2), an erbium doped optical fiber (3), and the like. The micro stress sensor provided by the invention uses a sinusoidal signal as a modulation signal, thereby generating no high frequency interference, and having the characteristics of more reliable work, high sensing precision, wide application range, etc.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, in particular to a micro stress sensor based on phase comparison. 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. At present, stress sensors are widely used in the field of engineering technology. Especially in emerging fields such as nanoparticle interaction and cell mechanics, there is an urgent need for micro-stress sensors, and the safety monitoring of bridges, tunnels, and building structures is inseparable from micro-stress sensors. Due to the above-mentioned advantages of the fiber Bragg grating, the stress sensor formed by it has higher reliability than other sensors, and is more suitable for use under harsh conditions. [0003] The closest existing technolo...

Claims

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Application Information

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IPC IPC(8): G01L1/24
CPCG01L1/246
Inventor 汝玉星毕琳旭杨忠岗孙茂强于广安
Owner JILIN UNIV
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