An optical heterodyne densitometer

Details An optical heterodyne densitometer An optical heterodyne densitometer

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988itp..work..249m&link_type=abstract

In NASA, Ames Research Center, Second Workshop on Improvements to Photometry p 249-253 (SEE N89-13310 04-89)

Physics

Optics

Attenuators, Densitometers, Heterodyning, Light Scattering, Mach-Zehnder Interferometers, Optical Measuring Instruments, Accuracy, Design Analysis, Sensitivity

Scientific paper

Researchers are developing an optical heterodyne densitometer with the potential to measure optical density over an unprecedented dynamic range with high accuracy and sensitivity. This device uses a Mach-Zender interferometer configuration with heterodyne detection to make direct comparisons between optical and RF attenuators. Researchers expect to attain measurements of filter transmittance down to 10 to the minus 12th power with better than 1 percent uncertainty. In addition, they intend to extend the technique to the problem of measuring low levels of light scattering from reflective and transmissive optics.

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