Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1978-09-27
1981-01-20
McGraw, Vincent P.
Optics: measuring and testing
By polarized light examination
With light attenuation
356399, G01B 1100, G01B 1114
Patent
active
042459125
ABSTRACT:
A parallelepiped box is provided with three screens of parallel opaque lines, forming a definite plane, separated by transparent interspaces, and with a mirror behind the screens to direct ambient light from an opening in the top of the box through the screens. A forward screen is provided in the front of the box. Two rearward screens are behind the forward screen with one screen at an angle with the forward screen, the angle being in the definite plane formed by the parallel lines. Light enters the box through a diffuser in the opening and is directed through the screens to produce moire patterns indicating whether an observation is made above, below or in the definite plane. A second mirror may be provided above the opening to direct ambient light thereinto or a light source may be located above the opening to provide light thereto.
REFERENCES:
patent: 3604813 (1971-09-01), Te Kronnie et al.
Bovernick Rodney B.
McGraw Vincent P.
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