Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1981-10-06
1984-05-15
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With light attenuation
33125C, 188188, G01B 1102
Patent
active
044485310
ABSTRACT:
In a displacement measuring instrument comprising a case having a substantially enclosed construction, a fixed scale solidly secured to the case, a spindle abutted at the forward end thereof against an object under measurement and reciprocated due to a displacement of the object under measurement and a movable scale operationally associated with the spindle, and capable of measuring the displacement of the object under measurement from a variation in physical value between the movable scale and the fixed scale due to the displacement of the object under measurement, a vane wheel is provided which is rotatable by the utilization of the reciprocatory motion of the spindle or the movable scale, so that a moving resistance increasing with the increase in the rate of travel can be given against the movement of the spindle or the movable scale.
REFERENCES:
patent: 3867037 (1975-02-01), Litke
patent: 4215480 (1980-08-01), Fisher et al.
Mitutoyo Mfg. Co. Ltd.
Rosenberger R. A.
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