Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-07-06
1997-01-07
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214R, H01J 4014
Patent
active
055919626
ABSTRACT:
A photoconductive photodetector to which a modulation voltage signal having a predetermined frequency is applied receives a signal to be measured (I.sub.I) while adjusting the phase of a modulation signal by a phase shifter. A current-to-voltage conversion unit extracts a DC component of a current signal generated at the photoconductive photodetector in correspondence with the intensity of a predetermined frequency component of the signal to be measured (I.sub.I) as a voltage signal. The maximum value of DC voltage values (V.sub.O) obtained in every setting operation of a phase adjustment value is identified. The maximum value corresponds a case in which the modulation voltage signal and the predetermined frequency component of the signal to be measured (I.sub.I) are in phase. The intensity of the predetermined frequency component of the signal to be measured (I.sub.I) is calculated. As a result, a high-speed phenomenon can be measured with a high precision.
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patent: 5003268 (1991-03-01), Tsuchiya
Sugeta et al, "Metal-Semiconductor-Metal Photodetector for High-Speed Optoelectronic Circuits", Proceedings of the 11th Conference (1979 International) on Solid State Devices, Tokyo, 1979; Japanese Journal of Applied Physics, vol. 19 (1980) Supplement 19-1, pp. 459-464, Jan. 1979.
Liu et al, "Controlled Nonlinearity Monolithic Integrated Optoelectronic Mixing Receiver", IEEE Photonics Technology Letters, vol. 5, No. 12, Dec. 1993, New York, pp. 1403-1406.
Philp et al, "A Simple Fibre Optic Sensor for Measurment of Vibrational Frequencies", Measurment Science & Technology, vol. 3, No. 6, Jun. 1992, pp. 603-606.
Koishi Musubu
Nishizawa Mitsunori
Takeshima Akira
Hamamatsu Photonics K.K.
Le Que T.
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