Aims to promote efficiency in laser feedback technique used in simultaneous multi-target measurement,a measurement channel expanding method has been proposed.Under linear current injection,laser's output frequency exhibits almost linear variation.When two targets have different laser-to-target distances,two independent frequency peaks appear in the frequency spectrum of feedback signals.Through all-phase FFT analysis at these two peaks,motion curves of two targets can be reconstructed.Both of the simulation model built with Python language and the corresponding experimental system have validated the effectiveness of the method proposed,and the experimental results indicate that the relative measurement error is less than 5％.
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