Design and performance of a dual polarizing detector system for broadband astronomical spectroscopy at submillimeter wavelengths

Computer Science – Performance

Scientific paper

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Photometric, Polarimetric, And Spectroscopic Instrumentation, Photoconductors And Bolometers, Submillimeter Wave, Microwave And Radiowave Spectrometers, Magnetic Resonance Spectrometers, Auxiliary Equipment, And Techniques, Bolometers, Infrared, Submillimeter Wave, Microwave, And Radiowave Receivers And Detectors, Spectroscopy And Spectrophotometry

Scientific paper

The design and performance of a dual polarizing bolometer detector system for use with a polarizing Fourier transform spectrometer to conduct broadband astronomical spectroscopy at submillimeter wavelengths is presented. The system features a fully differential electronics design which virtually eliminates common mode noise. The optical design efficiently rejects unwanted radiation, both spectrally and spatially, while minimizing the effects of resonant optical cavities. The system is cooled by an efficient, closed cycle 4He-3He refrigerator which is cycled under computer control. The noise performance of the system is determined from analysis of electrical, optical, and spectral measurements, and the results are compared with a theoretical bolometer model.

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