Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1976-10-04
1978-06-06
Evans, F. L.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356209, G01J 348
Patent
active
040933849
ABSTRACT:
A narrow angle, narrow bandwidth optical receiver system for detecting light rays reflected from a predetermined area illuminated by a laser beam having a known wavelength. A large collecting lens having a small field of view receives incoming reflected rays which are collimated by a pair of relay lenses having a narrow bandwidth, triple cavity, single element interference filter positoned therebetween. The filtered rays are processed by a photomultiplier tube and a CRT display to illustrate signals of interest within the illuminated area. An alternate embodiment provides a cone element to receive filtered rays from relay lenses for decreasing the size of the receiver system.
REFERENCES:
patent: 3515480 (1970-06-01), Altman et al.
patent: 3589815 (1971-06-01), Hosterman
patent: 3615135 (1971-10-01), Frazer
patent: 3712985 (1973-01-01), Swarner et al.
patent: 3942890 (1976-03-01), Malone
Benson et al., Nerem Record, Nov. 1962, pp. 34 and 35.
Dixon, Electronics, Apr. 19, 1963, pp. 39-43.
Davy, Journal of Scientific Instruments, vol. 42, No. 8, Aug. 1965, pp. and 537.
Lehr et al., Applied Optics, vol. 11, No. 2, Feb. 1972, pp. 300-304.
Evans F. L.
Hansen Henry
Iseman William J.
Sciascia R. S.
The United States of America as represented by the Secretary of
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