Abstract

An optical unit for the measurement of reflection density is described. In conjunction with a sensitive densitometer, optical densities up to 4.0 can be measured with highly selective spectral filtration. The unit utilizes 45° incident radiation with measurement of normally reflected radiation as specified for use with photographic materials. The stray light level amounts to less than 1 part in 100 000, and the unwanted specular radiation to less than 1 part in 10 000. Problems in the design and evaluation of this unit are reviewed.

© 1959 Optical Society of America

Unit Magnification Optical System without Seidel Aberrations

J. Dyson
J. Opt. Soc. Am. 49(7) 713-716 (1959)

Optical Analog Computers

Barton J. Howell
J. Opt. Soc. Am. 49(10) 1012-1021 (1959)

Fiber Optics. V. Light Leakage due to Frustrated Total Reflection*

N. S. Kapany
J. Opt. Soc. Am. 49(8) 770-778 (1959)

Reflecting Coatings for the Extreme Ultraviolet*

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J. Opt. Soc. Am. 49(6) 593-602 (1959)

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J. Opt. Soc. Am. 49(4) 368-371 (1959)