Abstract
A light position detector operating through a photovoltaic effect of a Pb2CrO5 ceramic disk with a pair of Au planar electrodes is investigated. A fabrication technique and the basic characteristics of the photovoltaic device for position detection are described. A peak photovoltage is obtained around the edge of the electrode for an incident light beam. The incident light beam shape and the electrode pattern are important factors for obtaining a linear relation between the light-beam position and the output signal from the device. A device fabricated for detecting one-dimensional light position has a high position resolution of 0.5 μm and a good linearity of ±2 μm or less. A two-dimensional device can be fabricated in the same way as the one-dimensional device, except for the electrode pattern. A method for two-dimensional light position detection using a Pb2CrO5 photovoltaic cell is demonstrated for a green LED as a light source.
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References
J.T. Wallmark: Electronics30, 165 (1957)
H.J. Woltring: IEEE Trans. ED-22, 581 (1975)
S. Arimoto, H. Yamamoto, H. Ohno, H. Hasegawa: J. Appl. Phys.57, 4778 (1985)
R.B. Emmons: Solid-State Electron.10, 505 (1967)
K. Toda, S. Morita: J. Appl. Phys.55, 210 (1984)