Method and system thereof for signal demodulation of heterodyne laser
A signal demodulation and laser technology, which is applied in the signal demodulation method of heterodyne laser and its system field, can solve the problems of long vibration period, high difficulty, and low frequency vibration that cannot be measured
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[0039] Such as figure 1As shown, the present invention provides a kind of signal demodulation method of heterodyne laser, it is characterized in that, comprises steps:
[0040] S1. Shift the phase of the Doppler carrier signal output by the heterodyne laser interferometer by 90 degrees to form two orthogonal carrier signals;
[0041] S2. Perform down-frequency processing on two paths of orthogonal carrier signals respectively to obtain two paths of low-frequency signals, and during the down-frequency processing process, use an external local oscillator signal to perform frequency mixing on the two paths of orthogonal carrier signals;
[0042] S3. Convert the two low-frequency signals into two discrete voltage signals through an analog-to-digital converter, and calculate the phase modulation value sequence accordingly, and demodulate the vibration acceleration amplitude and initial phase angle.
[0043] Specifically, in step S1, the linearly polarized laser of the heterodyne l...
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