Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-07-07
1995-01-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
429111, H01J 4014
Patent
active
053827872
ABSTRACT:
The invention provides a temperature switch material capable of detecting a very low temperature not higher than 150 K. It also provides a light switch material for detecting light in the ultraviolet region. It further provides a switch material suited for use as a substrate for thin oxide layer formation thereon. The switching material utilizes an abrupt change in photoelectric current as produced upon phase transition of SrTiO.sub.3 at a low temperature. The photoelectric switch or temperature switch utilizes the change in photoconduction spectrum upon irradiation of SrTiO.sub.3 with light in the 3 eV-5 eV ultraviolet region. A switch is available by varying the intensity of irradiating light thereby controlling the transition temperature.
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Ferroelectrics, vol. 43, 1982, New York, US, pp. 195-198, A. L. Kholkin et al. "Transient Photocurrents and Photoconductivity in Strontium Titanate".
Journal of the Physical Society of Japan, Proceedings of the Second International Meeting on Ferroelectricity 1969, vol. 28, 1970, Tokyo JP, pp. 454-456, H. Yasunaga "Photoconductivity Anomaly as an Evidence of the Local Ferroelectric Phase Transition around 47.degree. K in SrTiO3".
Physical Review, vol. 129, No. 1, 1 Jan. 1963, New York, US, pp. 90-94, R. O. Bell et al "Elastic Constants of Strontium Titanate".
Journal of the Physical Society of Japan, vol. 31, 1971, Tokyo JP, p. 614, K. Ohi et al., "Photoconduction of Potassium Tantalate".
Nakajima Akihiko
Takada Jun
Tawada Yoshihisa
Kanegafuchi Chemical Industry Co. Ltd.
Nelms David C.
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