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High-precision temperature sensor

A temperature sensor, high-precision technology, used 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, and achieve small phase detection errors. , Wide application, reliable work effect

Inactive Publication Date: 2018-12-18
JILIN UNIV
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  • 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. Unfavorable for fiber optic sensors that measure temperature changes

Method used

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Effect test

Embodiment 1

[0026] Embodiment 1 Overall structure of the present invention

[0027] Such as figure 1 Shown, the overall structure of the present invention has, pump source 1 (the LC962U type pump source of OCLARO Company, central wavelength 980nm, the maximum single-mode output optical power is 750mW) and optical wavelength division multiplexer 2 (COMCORE Company 980 / 1060nm The 980nm end of the single-mode optical 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 Yuxingguang Technology Co., Ltd. type motorized optical fiber delay line) connected to one end, the other end of the delay line adjustable line 11 is connected to the input end of the first optical isolator 10 (1550nm polarization-independent optical isolator), the control end of the delay line adjustable line 11 is connected to the electric The output port of level conversion c...

Embodiment 2

[0029] Embodiment 2 function transformation 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 , recorded as the 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, 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 conn...

Embodiment 3

[0031] Embodiment 3 Adaptive Amplitude Normalization Circuit

[0032]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 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 an adaptive amplitude normalization The input terminal of the circuit 27 is recorded as the port ADAPT_in, and is connected with the port ACOS_out of the function conversion circuit 26; the pin 1, the ...

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Abstract

The invention relates to a high-precision temperature sensor and belongs to the technical field of optical fiber sensors. The high-precision temperature sensor mainly comprises a pumping source (1), an optical wavelength division multiplexer (2), an Er-doped fiber (3) and the like. The high-precision temperature sensor provided by the invention uses a sinusoidal signal as a modulating signal, cannot produce high-frequency interference and has the characteristics of more reliable work, 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 high-precision temperature 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. At present, temperature sensors play an important role in safe production, especially in high-risk places such as mines, where temperature monitoring is crucial. However, most of the traditional temperature sensors are realized by the change of electrical signal, and the temperature sensor based on the change of electrical signal is greatly limited in practical application. Additional safety hazards, on the other hand, when used in harsh environments, they are greatly disturbed by the environment and the transmission is inconvenient. Due to the above-mentioned advan...

Claims

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Application Information

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Patent Type & Authority Applications(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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