Testing method by a spectroscopic photometry using three wavelen

Details Testing method by a spectroscopic photometry using three wavelen Testing method by a spectroscopic photometry using three wavelen

1983-02-02

1985-11-05

Evans, F. L.

Optics: measuring and testing

By shade or color

Trichromatic examination

250226, 250223B, 356414, 356416, 356240, 356407, G01J 350

Patent

active

045510229

ABSTRACT:
For detecting a leaking in a transparent or semi-transparent vessel by the dye bath method, the light passing through the vessel is divided into three wavelength regions, that is light having the characteristic wavelength of the dye bath liquid, the light having a wavelength shorter than said light as much as prescribed wavelength and the light having a wavelength longer than said light as much as prescribed wavelength, the curvature of transmittance curve based upon difference value of transmittance among three light having different wavelength is obtained for comparing with a preestablished value to judge the vessel to be inferior or normal with the compared output.

REFERENCES:
patent: 2479743 (1949-08-01), Hall et al.
patent: 3777169 (1973-12-01), Walter et al.
patent: 3961898 (1976-06-01), Neeley et al.
patent: 4029416 (1977-06-01), Hawes
patent: 4257709 (1981-03-01), Mostyn, Jr.
patent: 4300689 (1981-11-01), Franklin et al.

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