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热词
    • 1. 发明授权
    • Optical test apparatus for examining an object
    • 用于检查物体的光学测试装置
    • US4455086A
    • 1984-06-19
    • US347132
    • 1982-02-09
    • Robert N. WestAndrew J. Barker
    • Robert N. WestAndrew J. Barker
    • G01N21/89G01N21/00
    • G01N21/8901
    • Test apparatus and method for testing for faults in, for example, transparent sheet material in which two parallel beams of light separated by a distance "w" are passed through a grating having, for example, light transmitting and absorbing areas separated by a distance "w", so that as the two beams are scanned across the object and the grating the light output through the grating is generally constant. If, however, there are faults which displace one beam with respect to the other, then the spacing between the beams will change so the light output will vary from the norm. Furthermore, if there is a fault which would cause attenuation of the two beams, then the light output will again vary from the norm.
    • 用于测试例如透明片材的测试装置和方法,其中将两个平行光束分开一段距离“w”的光束通过光栅,该光栅具有例如隔开距离“ w“,使得当两个光束跨过物体和光栅扫描时,通过光栅输出的光通常是恒定的。 然而,如果存在相对于另一个移动一个光束的故障,则光束之间的间隔将改变,使得光输出将随规范变化。 此外,如果存在将导致两个光束衰减的故障,则光输出将再次从标准变化。