Abstract

A working model of a monochromatic sensitometer covering the wave-length region from 3500 to 11,000A has been built. Monochromatic radiation used for exposure is obtained from a double monochromator employing transmission replica gratings as the dispersing elements. The intensity of this radiation is measured with a thermopile. Intensity-scale exposures upon the photographic material result from the use of a specially designed intermittent intensity-scale sector wheel. The same time of exposure is employed at all wave-lengths, and therefore the spectral sensitivity curve derived from the intensity-scale characteristic curves is independent of any reciprocity law failure which the emulsion may exhibit.

© 1940 Optical Society of America

An Intensity-Scale Sensitometer that Works at Intensity-Time Levels Used in Practical Photography*

Wm. Bornemann and Clifton Tuttle
J. Opt. Soc. Am. 32(4) 224-229 (1942)

A Simple Intensity Scale Sensitometer Which Conforms with American Standard Requirements

Monroe H. Sweet
J. Opt. Soc. Am. 35(6) 379-381 (1945)

Absolute Sensitivity Measurements on Single-Grain-Layer Photographic Plates for Different Wave-Lengths*

J. H. Webb
J. Opt. Soc. Am. 38(4) 312-323 (1948)

A New Non-Intermittent Sensitometer

Arthur C. Hardy
J. Opt. Soc. Am. 10(2) 149-156 (1925)

Homochromatic Spectrophotometry in the Extreme Ultraviolet

George R. Harrison and Philip A. Leighton
J. Opt. Soc. Am. 20(6) 313-330 (1930)