Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-10-28
1993-11-30
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250239, 250226, H01J 4014
Patent
active
052667928
ABSTRACT:
An optical wavelength detector includes a photoelectric device that produces a signal in response to incident light thereon corresponding to a characteristic of the incident light such as wavelength. A light source is provided that can selectively expose light to the photoelectric device. A memory device stores device characterization data that corresponds wavelength information to current ratio signals from the photoelectric device. The current ratio signals are digitized and form part of the address for the memory. In a temperature compensated embodiment, the optical wavelength detector includes means to determine a temperature dependent electrical characteristic of the photoelectric device. In the preferred embodiment this electrical characteristic is the forward bias voltage detected when a predetermined forward bias current is applied to the photoelectric device in the dark. The temperature dependent forward bias voltage is converted to a digital signal and provides another part of the digital address for the memory. The memory generates a temperature compensated signal that corresponds to the incident light wavelength.
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Crowne David H.
Spillman Jr. William B.
Lewis Leonard L.
Nelms David C.
Ronyak David M.
Simmonds Precision Products Inc.
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