Reflective lens system

Details Reflective lens system Reflective lens system

G - Physics

02

B

88/17, 354/25, 3

G02B 23/02 (2006.01) G01C 3/30 (2006.01) G01S 17/06 (2006.01)

Patent

CA 1102595

REFLECTIVE LENS SYSTEM ABSTRACT A tacheometer utilizes a gallium arsenide laser diode in a phase shifting distance encoder, a sinusoidal interpolator in a phase shifting shaft angle encoder, a mercury pool in a phase shifting two axis off-level encoder, a shared phase to digital decoder and a digital processor, to measure angles and distances corrected for off-level, speed of light variations, refraction and the earth's curvature. A reflecting telescope is coupled to the shaft angle encoder and is incorporated in both the phase shifting distance encoder and the alignment system. The reflecting telescope has a doublet objective lens with an embedded secondary reflective surface facing a primary mangin mirror. A biconcave element of the doublet objective lens also functions as a corrector for the secondary reflective surface. A compact objective lens system is thus realized, having mini- mal interference between the corrector for the secondary reflective surface and the optical path through the doublet objective lens.

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