如图所示,工件置于发光器与受光器之间,光线从发光器发出,经透镜聚光后,沿工件表面穿过光屏进入受光器。如果受光器接收的光为干涉光,则表示工件表面在该处凹陷;反之,若光线没有进入受光器,则表明工件在该处凸出(遮光);若受光器能接收到不干涉的光,则表明工件形状合格。 As shown in the figure, the workpiece is placed between the light emitter and the light receiver. The light is emitted from the light emitter. After the light is condensed by the lens, it passes through the light screen along the surface of the workpiece and enters the light receiver. If the light received by the receiver is interference light, the surface of the workpiece is dented there; otherwise, if the light does not enter the receiver, it indicates that the workpiece protrudes (blocks light); if the receiver can receive non-interference light , Then the workpiece shape qualified.