Laser survey instrument having a reflection light blocking means

Details Laser survey instrument having a reflection light blocking means Laser survey instrument having a reflection light blocking means

1996-05-16

1999-02-02

Turner, Samuel A.

Optics: measuring and testing

Fiducial instruments

356248, G01C 1500

Patent

active

058672630

ABSTRACT:
A laser survey instrument, which is arranged on an optical axis of an emitted polarized irradiation light beam and is provided with a reflection light blocking means for blocking an incident reference light having a polarizing member and a 1/4 wave birefringence member, whereby a harmful reflection light is blocked by the reflection light blocking means to improve detection accuracy of a signal light to be detected.

REFERENCES:
patent: 3856402 (1974-12-01), Low et al.
patent: 5144486 (1992-09-01), Hart

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