LED point scanning system

Details LED point scanning system LED point scanning system

1995-05-10

1996-11-26

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2504581, 356328, H01J 314, G01N 2164

Patent

active

055788181

ABSTRACT:
An LED point imaging scanner for stimulating and for reading fluorescent and reflective signal radiation from a target sample is disclosed. The LED light source is mounted on a scan head and is focused into the pinhole aperture of a spatial filter, then collimated and focused to a spot on the sample. The spatial filter in the illumination path, or an optical fiber serving the equivalent function, effectively restricts the incoherent LED light and creates a point light source. Signal radiation from the sample is collected through the scan head and the returning light beam is collimated and focused onto the receiving section of a detection means. A spatial filter in the path of the returning beam may also be utilized. The detection means is either a small detector which is mounted directly on the scan head or an end of an optical fiber which transmits the point image to a remotely-positioned stationary detector. The scan head is moved along one or two axes relative to the sample for scanning of a target area of the sample.

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