(redirected from microdensitometers)
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An extremely sensitive densitometer used to measure optical densities of photographic plates or film to detect small details, such as spectral lines invisible to the human eye.
References in periodicals archive ?
CCD cameras have replaced glass plates, image-processing software has supplanted scanning microdensitometers, and satellite-based star catalogs have eliminated the need to measure star positions six months before or after the eclipse.