microdensitometer


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microdensitometer

(mÿ-kroh-den-să-tom -ĕ-ter) An optical instrument that measures and records small changes in the transmission density on a photographic plate, such as the faint features in a spectrum. The plate, mounted on a carriage, is moved through a light beam. A photomultiplier measures the amount of light transmitted by the plate and the output is fed to a chart recorder or computer.

microdensitometer

[¦mī·krō‚den·sə′täm·əd·ər]
(spectroscopy)
A high-sensitivity densitometer used in spectroscopy to detect spectrum lines too faint on a negative to be seen by the human eye.
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The photographs taken on night 2 did not reveal anything unusual despite undergoing microdensitometer scans.
patent for "Spot Microdensitometer for the Spectral Density Analysis of Film.
The scattered intensities were obtained from the photographic films using a unidimensional microdensitometer.
During the 1970s astronomers confirmed this characteristic pattern, now referred to as the "quadrupole azimuthal brightness asymmetry," by scanning scores of photographic plates of Saturn with a microdensitometer.
The scattered intensities were obtained from the photographic films using a one-dimensional microdensitometer.
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.