The effect of detector port radiation on the determination of insertion loss by Fourier transform spectrometry |
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| Affiliation: | 1. ARC Training Centre for M3D Innovation, Research School of Physics, Australian National University, Canberra, ACT, Australia;2. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;3. P.T. Freeport Indonesia, Tembagapura, Papua, Indonesia;4. Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;5. Centre for Advanced Microscopy, The Australian National University, ACT 0200, Australia;6. Department of Earth, Ocean, and Ecological Sciences, University of Liverpool, Liverpool, UK |
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| Abstract: | It is demonstrated that the identification of the measured power insertion loss of a specimen with the power transmission or reflection of that specimen in conventional Fourier transform spectrometry using internal modulation is susceptible to systematic error. The error arises from the presence of radiation from the detector port of the interferometer in its interferometrically modulated output, and is particularly significant at millimetre and long submillimetre wavelengths and when the specimen temperature differs from that of the interferometer. It is shown that such an error is not present in the determination of complex insertion loss by dispersive Fourier transform spectrometry owing to the greater symmetry of the experimental configuration with respect to the various radiation fluxes passing through the interferometer. The effect is demonstrated by the results of transmission measurements on specimens of the polymers polystyrene and TPX. |
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