Temperature detection system based on Michelson interference structure
A technology of interference structure and detection system, which is applied to thermometers, thermometers, and measuring devices with physical/chemical changes, which can solve the problems of variable frequency, difficult to filter out, unfavorable optical fiber sensors, etc., and achieve small phase detection errors , Wide range of applications, and the effect of improving sensing accuracy
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Embodiment 2
[0028] Embodiment 2 function transformation circuit
[0029] The structure of the function conversion circuit 28 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 terminal of the function conversion circuit 28, which is recorded as the port ACOS_in , is connected with the output end of the second photoelectric conversion circuit 27; 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 i...
Embodiment 3
[0030] Embodiment 3 Adaptive Amplitude Normalization Circuit
[0031] Because the amplitude of the signal output by the function conversion circuit 28 is small, and is affected by multiple parameters in the optical path and the circuit, the size is indefinite, so the present invention designs an adaptive amplitude normalization circuit 29, which is used to convert the signal output by the function conversion circuit 28 The amplitude is normalized to the optimal size to further improve the accuracy of demodulation. The specific structure is as image 3As shown, 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 input end of the adaptive amplitude normalization circuit 29, which is recorded as the port ADAPT_in, It is connected with the port ACOS_out of the function conversion circuit 28; the pin 1, the pin 7, the pin 8 and the pin ...
Embodiment 4
[0032] Embodiment 4 phase comparison circuit
[0033] like Figure 4 As shown, the structure of the phase comparison circuit 30 used in the present invention is that one end of the capacitor C10 is connected to the non-inverting input end of the op amp U5 and one end of the resistor R13, and the other end of the capacitor C10 is used as an input end of the phase comparison circuit 30. The port PHASE_in1 is connected to the port ADAPT_out of the adaptive amplitude normalization circuit 29; the other end of the resistor R13 is grounded; the positive power supply terminal of the operational amplifier U5 is connected to the +5V power supply, the negative power supply terminal is grounded, the inverting input terminal is grounded, and the output terminal is connected to The CLK end of D flip-flop U6A; the D port of D flip-flop U6A is grounded; one end of capacitor C11 is grounded, and the other end is connected to the PR end of D flip-flop U6A; one end of resistor R14 is connected ...
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Abstract
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