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A High Precision Temperature Sensor

A temperature sensor, high-precision technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of signal phase-frequency characteristics, unfavorable optical fiber sensors, and variable frequency, etc., to achieve small phase detection errors , Wide range of applications, reliable results

Inactive Publication Date: 2019-09-27
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. Unfavorable for fiber optic sensors that measure temperature changes

Method used

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  • A High Precision Temperature Sensor
  • A High Precision Temperature Sensor
  • A High Precision Temperature Sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Overall structure of the present invention

[0027] Such as figure 1 As shown, the overall structure of the present invention has: pump source 1 (LC962U pump source of OCLARO company, center wavelength 980nm, maximum single-mode output optical power of 750mW) and optical wavelength division multiplexer 2 (COMCORE company 980 / 1060nm The 980nm end of the single-mode fiber wavelength division multiplexer) is connected, and the 1550nm end of the optical wavelength division multiplexer 2 is connected to the delay line adjustable fiber 11 (VDL-40-15-S9-1-FA of Sichuan Yuxingxing Optical Technology Co., Ltd. Type electric optical fiber delay line) is connected to one end, the other end of the delay line adjustable light 11 is connected to the input end of the first optical isolator 10 (1550nm polarization-independent optical isolator), and the control end of the delay line adjustable light 11 is connected to the electric The output port of the level conversion chip 12 ...

Embodiment 2

[0029] Example 2 Function Conversion Circuit

[0030] Such as figure 2 As 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 , Marked as port ACOS_in, connected to the output end of the differential amplifier 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 connected to the ...

Embodiment 3

[0031] Embodiment 3 Adaptive amplitude normalization circuit

[0032] Since the amplitude of the signal output by the function conversion circuit 26 is small and is affected by multiple parameters in the optical path and the circuit, the magnitude is uncertain. Therefore, the present invention designs an adaptive amplitude normalization circuit 27 to convert the signal output by the function conversion circuit 26. The amplitude of is normalized to the optimal size to further improve the accuracy of demodulation. The structure of the adaptive amplitude normalization circuit 27 is that one end of the capacitor C9 is connected to one end of the resistor R3 and the pin 3 of the chip U2, the other end of the resistor R3 is grounded, and the other end of the capacitor C9 is used as the adaptive amplitude. The input terminal of circuit 27, marked as port ADAPT_in, is connected to port ACOS_out of function conversion circuit 26; pin 1, pin 7, pin 8, and pin 14 of chip U2 are all grounded...

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Abstract

A high-precision temperature sensor of the invention belongs to the technical field of optical fiber sensors. Its main structures include a pump source (1), an optical wavelength division multiplexer (2), an erbium-doped optical fiber (3) and the like. The invention uses a sinusoidal signal as a modulation signal, does not generate high-frequency interference, and has the characteristics of more reliable operation, high sensing precision, wide application range and the like.

Description

Technical field [0001] The invention belongs to the technical field of optical fiber sensors, and particularly relates to a high-precision temperature sensor. Background technique [0002] Fiber Bragg grating (FBG) is widely used in the field of sensing technology because of its advantages such as anti-electromagnetic interference, chemical resistance, low transmission loss, small size and light weight, and easy mass production. At present, temperature sensors play an important role in safe production, especially in high-risk places such as mines, where temperature monitoring is essential. However, most of the traditional temperature sensors are realized by changes in electrical signals, while temperature sensors based on changes in electrical signals are greatly restricted in practical applications. On the one hand, the use of electrical signals can cause problems in certain environments (such as coal mines). Additional security risks, on the other hand, when used in harsh envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/32
Inventor 汝玉星于广安毕琳旭杨忠岗孙茂强
Owner JILIN UNIV
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