Abstract

The Multiple-Sine-Slit Microdensitometer (MSSM) measures transmittance modulation by scanning the sample with a sinusoidal irradiance distribution generated by laser two-beam interference. The theory of the instrument is derived both from conventional microdensitometry and from treating the sample as a complex valued grating that diffracts two impinging coherent fields. The instrument has a constant MTF of 0.5; its principle disregards any phase modulations in the sample; and its large measuring area improves signal-to-noise ratio by 1–2 orders of magnitude. These are necessary qualifications for determining the MTF of recording materials of very high resolution. With a He–Ne laser, the range of the MSSM spans from 4 c/mm to 1500 c/mm. The practical implementations of the evaluation of film MTF’s with this system are described.

© 1974 Optical Society of America

Multiple-Sine-Slit Microdensitometer and MTF Evaluation for High Resolution Emulsions. 2: MTF Data and Other Recording Parameters of High Resolution Emulsions for Holography

Stefan Johansson and Klaus Biedermann
Appl. Opt. 13(10) 2288-2291 (1974)

Development effects and the MTF of high-resolution photographic materials for holography*

Klaus Biedermann and Stefan Johansson
J. Opt. Soc. Am. 64(6) 862-870 (1974)

MTF evaluation with optical matched filters

Alex Grumet
Appl. Opt. 16(1) 154-159 (1977)

Computation of light transmitted by a thick grating, for application to contact printing

Frank G. Kaspar
J. Opt. Soc. Am. 64(12) 1623-1630 (1974)

Elimination of Microdensitometer Degradation from Scans of Photographic Images

Robert A. Jones and John F. Coughlin
Appl. Opt. 5(9) 1411-1414 (1966)