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We present a novel precise angle measurement scheme based on parallel multiplex laser feedback interferometry(PLFI), which outputs two parallel laser beams and thus their displacement difference reflects the angle variation of the target. Due to its ultrahigh sensitivity to the feedback light, PLFI realizes the direct non-contact measurement of noncooperative targets. Experimental results show that PLFI has an accuracy of 8 within a range of 1400. The yaw of a guide is also measured and the experimental results agree with those of the dual-frequency laser interferometer Agilent5529 A.
We present a novel precise measurement scheme based on parallel multiplex laser feedback interferometry (PLFI), which outputs two parallel laser beams and thus their displacement difference reflects the angle variation of the target. Due to its ultrahigh sensitivity to the feedback light, PLFI realizes the direct non-contact measurement of noncooperative targets. Experimental results show that PLFI has an accuracy of 8 within a range of 1400. The yaw of a guide is also measured and the experimental results agree with those of the dual-frequency laser interferometer Agilent 5529 A .