Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991npl..rept.....a&link_type=abstract
In National Physical Lab., An Intercomparison of Measurement Techniques for the Determination of the Dielectric Properties of So
Physics
Bolometers, Dielectrics, Electromagnetic Measurement, Fourier Transformation, Indium Antimonides, Spectrometers, Mercury Vapor, Mirrors
Scientific paper
Measurements made by transmision dispersive Fourier transform spectroscopy using a polarizing wire grid interferometer in the plane mirror configuration are presented. The radiation source is a mercury vapor arc lamp, the detector a liquid helium cooled indium antimonide hot electron bolometer. The main body of the interferometer was evacuated, but the specimen chamber itself was not, and was isolated from the vacuum environment by a Mylar window. During measurements the specimen chamber was flushed with dry nitrogen gas to remove atmospheric water vapor. The specimen alignment in the sample chamber is defined by being gravity held on a three ball support. Measurements could be made over the spectral range from 0.1 to 4 cm, although all of the present measurements were in the region below 3 cm. The greatest measurement reproducibilities were achieved in the wavenumber region above 0.4 cm. Rapidly decreasing signal levels below 0.4 cm resulted in poorer measurement accuracies in that low wavenumber region. The results of the measurements on the intercomparison specimens are presented in graphs and tables.
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