Femtosecond optical frequency comb based sinusoidal phase modulation interferometric absolute distance measuring device and method
A technology of phase modulation and ranging device, applied in measurement devices, optical devices, instruments, etc., can solve the problems of small dynamic range, signal blanking, affecting low-frequency demodulation characteristics, etc.
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[0055] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0056] Such as figure 1 As shown, the specific implementation of the present invention includes a light source system I, a sinusoidal phase modulation interference system II and a signal processing system III; the output end of the light source system I is connected to the input end of the sinusoidal phase modulation interference system II, and the sinusoidal phase modulation interference system II outputs an interference beam to the signal processing system III; the output of the light source system I includes two laser beams with different wavelengths directed to the sinusoidal phase modulation interference system II, and the interference beam is formed in the sinusoidal phase modulation interference system II and processed by the signal processing system III for PGC phase demodulation According to the measurement principle of frequency scanning int...
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