Temperature sensor based on Mach-Zehnder interference structure
A technology of temperature sensor and interference structure, used in thermometers, thermometers, instruments and other directions with physical/chemical changes, can solve the problems of signal phase-frequency characteristics, unfavorable optical fiber sensors, difficult to filter out, etc., to achieve phase detection The effect of small error, wide application and reliable work
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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 wound on the first piezoelectric ceramic 11 (cylindrical piezoelectric ceramic, outer diameter 50mm, inner diameter 40mm, height 50mm) One end of the optical fiber is connected, the other end of the optical fiber wound on the first piezoelectric ceramic 11 is connected to the input end of the first optical isolator 10 (THORLABS company IO-H-1064B single-mode optical isolator), the first piezoelectric The control terminal of the ceramic 11 is connected to t...
Embodiment 2
[0029] Embodiment 2 function conversion circuit
[0030] The structure of the function transformation circuit 26 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 transformation circuit 26, which is 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, 13 of the trigonometric function converter U1 are grounded, and the pins 9, 10 are connected to the capacitor C2 One end 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 is grounded; The pin 1 of the trigonometric function converter U1 is connecte...
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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