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    • 7. 发明授权
    • Noncontact optical gauging system
    • 非接触光学测量系统
    • US4299491A
    • 1981-11-10
    • US102310
    • 1979-12-11
    • James P. WatersRobert K. Thornton
    • James P. WatersRobert K. Thornton
    • G01B11/24
    • G01B11/24
    • A laser beam is focused to a spot on the surface of an object whose contour is to be measured. The spot is projected from the surface onto a detector by a reciprocating mirror which scans the spot across the detector. The detector produces two output signals consisting of sequential pulses at the frequency scan. The relative duration of these pulses or duty cycle reflects the change in contour dimension with respect to the scan centerline or mid point that corresponds to the base or zero dimension of the contour surface. The duty cycle is utilized to compute the change in contour dimension and to move the optics in such a way as to allow the spot to be continually scanned across the detector. The movement of the optics is made whenever there is a certain contour dimension change and by correlating the movement in the position of the optics and the instantaneous computed contour change reflected in the scan, the actual contour dimension is obtained.
    • 激光束被聚焦到要测量其轮廓的物体的表面上的点上。 该点通过往复式反射镜从表面投射到检测器上,该往复镜扫描检测器上的斑点。 检测器产生两个输出信号,由频率扫描的顺序脉冲组成。 这些脉冲或占空比的相对持续时间反映了轮廓尺寸相对于对应于轮廓表面的基础或零度尺寸的扫描中心线或中点的变化。 占空比用于计算轮廓尺寸的变化,并以这样一种方式移动光学元件,使斑点能够跨过检测器连续扫描。 只要存在一定的轮廓尺寸变化并且通过将光学器件的位置的移动与在扫描中反映的瞬时计算的轮廓变化相关联,则获得光学元件的运动,获得实际轮廓尺寸。