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本文叙述了用激光光斑法测量工件表面光洁度的一种方法──光电转换电压比值法，即β曲线法，并指出了平面与曲面的β值的一致性。文中也给出了测量β值的特定鉴别电路及数显电路。
In this paper, a method for measuring the surface finish of a workpiece by laser spotting is described. Photoelectric conversion voltage ratio method, ie β-curve method, and the consistency of the β value between plane and curved surface are pointed out. Also given in the paper to measure the value of β-specific identification circuit and digital circuits.