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将四象限探测器应用于激光干涉的测量领域,提出一种检测激光干涉条纹正交信号的新方法。利用叫象限探测器的探测区域象限化特征,以及干涉条纹在探测单元内的矢量叠加原理,实现了干涉条纹的正交信号检测。实验表明,通过改变四象限探测器的旋转角度,可以简便地检测到条纹的正交信号。当检测不同周期的干涉条纹时只需旋转四象限探测器至适当角度,就可检测到相应周期干涉条纹的正交信号,并且采用了差分技术处理信号,从而有效地抑制了外界环境产生的噪声。与传统检测方法相比具有易于操作、抗干扰能力强等优点。
A four-quadrant detector is applied in the field of laser interferometry. A new method of detecting quadrature signal of laser interference fringes is proposed. The quadrature signal detection of the interference fringes is realized by using the quadrant detection feature of the quadrant detector and the vector superposition principle of the interference fringes in the detection unit. Experiments show that by changing the rotation angle of the four-quadrant detector, streaky orthogonal signals can be easily detected. When detecting the interference fringes of different periods, only the four-quadrant detector can be rotated to an appropriate angle to detect the orthogonal signals of the corresponding periodic interference fringes, and the differential technique is adopted to process the signals so as to effectively suppress the noise produced by the external environment . Compared with the traditional detection methods are easy to operate, anti-interference ability and so on.