Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1988-09-29
1989-07-11
Evans, F. L.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
73 73, G01N 2100
Patent
active
048465720
ABSTRACT:
The invention relates to an optical device for measuring moisture in a substrate, in which device water is conveyed from the substrate along a porous absorption part (5) on a surface (4) of a prism so that is causes the critical angle of the total reflection to be changed thereon as a result of the change of the index of refraction. Another surface of the prism is dyed or patterned and covered in such a manner that it becomes visible only through reflection from the surface (4) when the surface is dry. When the surface (4) is moist, only the absorption part is visible through the viewing surface. The invention is advantageous in that due to the application of the principle of total reflection the change from an indication of the presence of moisture to an indication of the absence of moisture takes place sharply, not gradually.
REFERENCES:
patent: 2943530 (1960-07-01), Nagel
patent: 3026718 (1962-03-01), Matson
patent: 3045477 (1962-07-01), Matson
patent: 3345870 (1967-10-01), Yoshinaga
patent: 3364733 (1968-01-01), Holdsworth
patent: 3824844 (1974-07-01), Strickland
patent: 4130012 (1978-12-01), Lockerby et al.
Evans F. L.
Meller Michael N.
Moistic Oy
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