Optical and electronically compared absorptiometer

Details Optical and electronically compared absorptiometer Optical and electronically compared absorptiometer

1984-09-18

1987-01-20

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Fluid color transmission examination

250565, 356435, G01N 2185, G01N 2131

Patent

active

046377301

ABSTRACT:
This invention relates to an optical absorptiometer which is characterized by a light source unit of a broad wavelength having a source of constant energy which is collimated into two light beams, one of which is transmitted through the liquid to be measured, and another beam which is transmitted through a conductor and acts as a reference beam, and a detector unit which contains two photocells, one photocell for measuring the beam transmitted through the liquid to be measured, and another photocell which measures the reference beam, a position in the absorptiometer for optically placing the liquid to be measured between the source unit and the detector unit, and means for measuring the energy difference between the light beams of the measured liquid and the reference beams in terms of absorbance, and means for converting this result to an electrical signal. In the preferred embodiment, the constant energy in the light source is controlled by feedback circuitry; the reference beam is transported by a fiber optic cable to the reference photocell of the detector unit; water condensation on the optical and viewing windows is prevented by means of dry air flow; the electrical signal is displayed and/or relayed to control an operation; and the reference beam is a segment of the original light beam from the source.

REFERENCES:
patent: 2273356 (1942-02-01), Holven et al.
patent: 3489906 (1970-01-01), Beer
patent: 3822097 (1974-07-01), Allington
patent: 3838925 (1974-10-01), Marks
patent: 4152075 (1979-05-01), Rellstab et al.
patent: 4273449 (1981-06-01), Schmid

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