ROOM TEMPERATURE LIGHT-THERMO-DETECTOR MADE OF HIGH-Tc SUPERCONDUCTOR
Zhang Peng-xiang (张鹏翔)a, Li Guo-zhen (李国桢)a, Zhang Yan (张燕)a, Wen Xiao-ming (文小明)b, H. U. Habermeierc
a Department of Material Science and Engineering, Yunnan Polytechnic University, Kunming 650051, China; b Department of Physics, Yunnan University, Kunming 650091 China; c Max-Planck Institute für Festk$\ddot{o}$rperforschung, Stuttgart, Germany
Abstract Based on the anisotropic Seebeck tensor coefficients, a light-thermo-radiation detector made of high-Tc superconductor (YBa2Cu3O7-$\delta$) was fabricated, which can function at room temperature. The induced voltaic signals at various modulation frequencies for radiation from He-Ne laser and from a 500 K black body were measured. The noise ratio for detecting He-Ne laser radiation and the D* for black body were evaluated. Compared with bolometer made of high-Tc superconductor which functions at liquid nitrogen, and with pyroelectric detector, it was found that the advantages of this new device are that the device can work at room temperature with very low noise and very fast response. Although having a lower D* value than that of bolometer for the present device construction, we point out the possibility and the direction for improving the D* value, hence the promising prospect of this kind of device.
Received: 21 November 1997
Revised: 13 May 1998
Accepted manuscript online:
Zhang Peng-xiang (张鹏翔), Li Guo-zhen (李国桢), Zhang Yan (张燕), Wen Xiao-ming (文小明), H. U. Habermeier ROOM TEMPERATURE LIGHT-THERMO-DETECTOR MADE OF HIGH-Tc SUPERCONDUCTOR 1998 Acta Physica Sinica (Overseas Edition) 7 810
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