【摘 要】
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In order to evaluate the ground-based infrared telescope sensitivity affected by the noise from the atmosphere,instruments and detectors,we construct a sensitiv
【机 构】
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School of Physics,Henan Normal University,Xinxiang 453007,China;Henan Key Laboratory of Infrared Mat
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In order to evaluate the ground-based infrared telescope sensitivity affected by the noise from the atmosphere,instruments and detectors,we construct a sensitivity model that can calculate limiting magnitudes and signal-to-noise ratio (S/N).The model is tested with tentative measurements of M'-band sky brightness and atmospheric extinction obtained at the Ali and Daocheng sites.We find that the noise caused by an excellent scientific detector and instruments at-135℃ can be ignored compared to the M'-band sky background noise.Thus,when S/N =3 and total exposure time is 1 second for 10 m telescopes,the magnitude limited by the atmosphere is 13.01m at Ali and 12.96m at Daocheng.Even under less-than-ideal circumstances,i.e.,the readout noise of a deep cryogenic detector is less than 200 e-and the instruments are cooled to below-87.2℃,the above magnitudes decrease by 0.056m at most.Therefore,according to observational requirements with a large telescope in a given infrared band,astronomers can use this sensitivity model as a tool for guiding site surveys,detector selection and instrumental thermal-control.
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