Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-04-30
1993-06-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
356 5, H01J 3150
Patent
active
052201643
ABSTRACT:
An integrated LIDAR receiver includes a single detection element to provide both imaging and ranging functions. The single detection element includes an opaque photocathode, a microchannel plate (MCP) electron multiplier, and a phosphor coated anode covered with a metalized layer. The metalized layer on the phosphor anode allows electrons striking the anode to be detected as a prompt electrical current. The prompt electrical current is detected through a transformer that couples the anode to a power supply. The power supply biases the anode relative to the MCP and photocathode such that the MCP is grounded. The use of a transformer allows the prompt anode current to be detected without having to ground the anode, thereby simplifying the power supply circuitry. The detection of the prompt electrical current provides a first output signal useful for ranging information. Visible light (photons) is also output from the anode in response to electrons striking the phosphor in the anode, and is used to provide an intensified image of a scene. The visible light may thereafter be detected by an imaging sensor, such as a CCD camera.
REFERENCES:
patent: 5049730 (1991-09-01), Loveland
Lieber Albert J.
Trost Peter K.
General Atomics
Nelms David C.
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