Optics: measuring and testing – By shade or color – Fluid color transmission examination
Patent
1978-07-28
1980-03-11
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
Fluid color transmission examination
356326, G01N 2102
Patent
active
041926145
ABSTRACT:
A spectrophotometer detector cell assembly having improved sensitivity, has a cell defined by a bore through a body and closed at the ends by radiation transparent windows with inlet and outlet passages through the body to the bore, so that radiation passed through the sample fluid flowing through the bore is detected by a photodetector. The body, which is made of a thermally conductive material, is a large thermal mass is relation to the volume of the cell and a tubular inlet conduit, also made of a thermally conductive material, wraps around the body and connects to the inlet passage so that fluid flowing into the bore will tend to reach a stable temperature due to the heat sink effect of the body and conduit thereby stabilizing the refractive index of the fluid in the bore and enhancing the sensitivity of the photodetection. Sensitivity is further enhanced by focussing the radiant energy entering the bore and by concentrating the exiting radiation in a planar area in which the diameter of the bundle of exiting energy rays does not change with changes in the refractive index of fluid in the cell, and by having the latter area substantially coincide with the photodetector surface.
REFERENCES:
patent: 3022704 (1962-02-01), Cary
patent: 3551062 (1967-07-01), Brown
patent: 3606547 (1971-09-01), Iwahashi
patent: 3614242 (1971-10-01), Hrdina
patent: 3684386 (1972-08-01), Noll
patent: 3941487 (1976-03-01), Ehret et al.
patent: 4019372 (1977-04-01), Parkell et al.
Demey, II Charles F.
Helms Charles C.
Giarratana S. A.
Grimes E. T.
Masselle F. L.
McGraw Vincent P.
The Perkin-Elmer Corporation
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