Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1974-07-19
1976-01-06
McGraw, Vincent P.
Optics: measuring and testing
Range or remote distance finding
With photodetection
350162R, G01J 318
Patent
active
039307280
ABSTRACT:
Monochromator comprising a concave grating, the lines of which are situated at the intersection of the concave surface with a family of surfaces geometrically like the equiphasic surfaces obtained as loci of the luminous intensity maxima produced by the interference of two beams from two point sources C and D, an entry slit A and an exit slit B, wherein the polar coordinates of the points C and D and of the entry slit A and exit slit B in a system of polar coordinates having as its origin the apex of the grating and as reference axis the axis of the grating in a plane of reference passing through this axis are connected by the following relationships: ##EQU1## in which (.alpha., l.sub.A), (.beta., l .sub.B), (.beta., l.sub.C) and (.delta., l.sub.D) are the polar coordinates of A,B,C and D, respectively, R is the radius of curvature of the grating, .omega.=(.alpha.+.beta.) /2 and .phi.=(.alpha.-.beta.)/2.
REFERENCES:
patent: 3628849 (1971-12-01), Flamand et al.
"Aberration-Corrected Concave Gratings Made Holographically" by Cordelle et al., published in the work Optical Instruments and Techniques, 1969, (Oriel Press, London), pp. 117-124.
Flamand Jean
Passereau Genevieve
Pieuchard Guy
Evans F. L.
Jobin-Yvon
Levine Alan H.
McGraw Vincent P.
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