Laser optical density measurement system

Details Laser optical density measurement system Laser optical density measurement system

1999-02-01

2000-10-10

Kim, Robert H.

Optics: measuring and testing

For light transmission or absorption

By comparison

G01N 2100

Patent

active

06130753&

ABSTRACT:
An apparatus for measuring optical density of highly absorptive materials in which a beam splitter divides light from a laser source into a reference beam, which is directed to a reference detector, and a sample beam, which is reflected off a diffusing plate, through a light limiting aperture, and to a sample. The emanations from the sample are directed to a sample detector. An instrumentation amplifier compares the intensities of the two detectors. The aperture and reference detector are positioned so that the measured intensities are equal, and the optical density of the sample is calculated.

REFERENCES:
patent: 3923397 (1975-12-01), Shuck
patent: 4068956 (1978-01-01), Taboada
patent: 5032024 (1991-07-01), Cope

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