RECIPROCITY IN SIMULATIONS OF BOLOMETRIC DETECTORS IN TRANSMITTING MODE |
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Authors: | Vladimir B Yurchenko and Eduard V Yurchenko |
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Institution: | (1) Experimental Physics Department, National University of Ireland, Maynooth, Co., Kildare, Ireland;(2) Institute of Radiophysics and Electronics, NAS of Ukraine, 12 Proskura St., Kharkov, 61085, Ukraine |
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Abstract: | Bolometric detectors used in radio-astronomical instruments such as the ESA Planck Surveyor, operate as incoherent receivers
of electromagnetic radiation. Meanwhile, the optical (quasi-optical) parts of the instruments (feed horns, telescope mirrors)
are conventionally designed in transmitting mode when a coherent source of radiation (supposedly, equivalent to the bolometric
detector) replaces the detector and radiates the electromagnetic waves through the optical system to the sky. The rules of
reciprocity in such a replacement of a detector by an “equivalent transmitter” located in a lossy (open) structure (a bolometric
cavity coupled via the feed horn with the outer space) are not obvious and usually ignored. A conventional simplistic approach
used in this problem may cause errors in the design of such systems. By considering simple, analytically solvable models that
simulate bolometric detectors surrounded by some structures, we find the rules of reciprocity providing the necessary equivalence
in replacing the receiver by an appropriate transmitter as needed for the rigorous simulations of infrared and submillimetre-wave
bolometric systems. |
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Keywords: | ESA Planck Surveyor bolometric detectors infrared systems |
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