equidensity technique

equidensity technique

[¦ē·kwə¦den·səd·ē ‚tek‚nēk]
(analytical chemistry)
Interference microscopy technique utilizing the Sabattier effect in photographic emulsions; the equidensities (lines of equal density in a photographic emulsion) are produced by exactly superimposing a positive and a negative of the same interferogram, and making a copy; used to measure photographic film emulsion density.