Homodyne Laser Interferometer.

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  • Chao Zu Wen
    Opto–Electronics & Systems Laboratories, Industrial Technology Research Institute, 195 Chung Hsing Road, Section 4, Chutung, Hsin Chu 31015, Taiwan, R.O.C.

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Abstract

A homodyne laser interferometer which, upon projecting two beams from a two-frequency laser source onto a moving target, interprets, by employing a frequency-count-addition process, two Doppler frequency shifts, each occurring from each beam when the beams are returning to the interferometer. The conceptual system structure and the principle of signal processing are described.

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