Seven matched bolometers for millimeter wave observations |
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| Authors: | N Kuno H Matsuo Y Mizumoto A E Lange J W Beeman and E E Haller |
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| Institution: | (1) Nobeyama Radio Observatory, Minamimaki, Minamisaku, 384-13 Nagano, Japan;(2) Astronomical Institute, Faculty of Science, Tohoku University, Aoba-ku, Sendai, 980 Miyagi, Japan;(3) Communications Research Laboratory, Koganei, 184 Tokyo, Japan;(4) Department of Physics, Faculty of Science, Kobe University, Rokkodai, Nada-ku, 657 Kobe, Japan;(5) Department of Physis, University of California, 94720 Berkeley, California, California;(6) Lawrence Berkeley Laboratory, 94720 Berkeley, California, California;(7) Department of Materials Science and Mineral Engineering, University of California, 94720 Berkeley, California, California |
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| Abstract: | We have fabricated a millimeter wave observation system using an array of bolometric detectors. The performance of the system depends largely on obtaining identical performance from each bolometer. We achieved a variance in the responsivity of less than 4% except for one of the seven elements. The bolometers had an electrical NEP of 1.3×10–16 W/ Hz under radiation background loading of 30pW. We used an AC bridge readout circuit to significantly improve the stability of the array and showed that observations can be done without a mechanical beam switch. The bolometer array is now in use on the Nobeyama 45-m telescope for 150GHz observations.H. Matsuo thanks those who helped him work on bolometers during his stay in Berkeley, especially to T. Wilbanks, M. Devlin and C. Inman. The authors are also grateful to S. Sato and T. Watabe at Nagoya University for their advice on the AC bridge circuit. This work is partly supported by the Shimazdu Science Foundation. |
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