Modulated laser light detector with discrete fourier...

Details Modulated laser light detector with discrete fourier... Modulated laser light detector with discrete fourier...

2008-01-29

2008-01-29

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100, C708S405000, C398S202000, C702S077000, C702S079000, C702S126000

Reexamination Certificate

active

07323673

ABSTRACT:
A modulated laser light detector that converts laser light energy into electrical signals which exhibit a frequency that is substantially the same as the laser light modulation frequency, in which these signals allow the detector unit to determine a position where the laser light is impacting upon a photodiode array. A superheterodyne receiver circuit is used to provide high gain at an improved signal-to-noise ratio to improve the range at which the modulated laser light signal can be reliably detected. Various types of signal detection circuits are available. Various processing algorithms are disclosed, including a Discrete Fourier Transform with a simplified computational algorithm for use with a low-power processor device.

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