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The elliptical mirror of a grating detector, as described in U.S. patent 3,835,249, is replaced by an integrating rod, as shown in the IBM Technical Disclosure Bulletin 15, 1368 (September 1972).
English (United States)
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Integrating Rod As Grating Detector
The elliptical mirror of a grating detector, as described in U.S. patent
3,835,249, is replaced by an integrating rod, as shown in the IBM Technical
Disclosure Bulletin 15, 1368 (September 1972).
Laser beam 1 from a laser is reflected by rotating mirror 2 through optics 3
onto grating 5. Mirror 2 rotates, preferably with constant speed, thus scanning
reflected beam 4 along transparent grating 5, whereby integrating rod 6 receives
pulsed light signals, the pulse rate of which essentially depends on the speed of
mirror 2, the distance between mirror 2 and rod 6, and the line density on grating 5. In rod 6, light pulses are transferred by diffused reflection and internal total
reflection to photodetector 7, which delivers an electrical output signal via
amplifier 8 to threshold circuit 9 for final output at point 10.
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