Densitometer

Details Densitometer Densitometer

1976-09-08

1978-04-04

Corbin, John K.

Optics: measuring and testing

For optical fiber or waveguide inspection

350 78, 356201, 356209, G01N 2122, G01N 2148, G02B 700

Patent

active

040824586

ABSTRACT:
A densitometer which measures reflection optical density and transmission optical density has a lens barrel comprised of a fixed portion and a movable portion. The movable portion is slidably engaged with the fixed portion and movable up and down. When the density is measured, the lower end of the movable portion is put into contact with the surface of a sample to be measured. The fixed portion and the movable portion of the lens barrel is comprised of an inner cylinder and an outer cylinder extending coaxially with each other. A flux of light for illuminating the surface of the sample is guided between the inner and outer cylinders and condensed on the surface of the sample. The light reflected by the sample is guided through the inner cylinder. The inner cylinder has a collimator lens for collimating the light from the sample in the movable portion thereof and a focusing lens for focusing the collimated light on a photodetector in the fixed portion thereof, so that the light from the sample is always focused on the photodetector regardless of the position of the movable portion.

REFERENCES:
patent: 2059781 (1936-11-01), Ellestad
patent: 3244062 (1966-04-01), Sweet
patent: 3762817 (1973-10-01), Harklau
patent: 3814523 (1974-06-01), Abe
patent: 3999860 (1976-12-01), Demsky et al.
Altman et al. "A Microdensitometer for Reflecting Samples" Photographic Science & Technique, 2-1957, pp. 10-12.

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