hw-2 Research_Laser Triangulations sensors

hw-2 Research_Laser Triangulations sensors - Aung Hein ME...

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Aung Hein ME 120 9/16/09 Research: Laser triangulation sensors Laser triangulation sensors determine the position of a target by measuring reflected from the target surface. A 'transmitter' (laser diode) projects a spot of light to the target, and its reflection is focused via an optical lens on a light sensitive device or 'receiver'. If the target changes its position from the reference point the position of the reflected spot of light on the detector changes as well. The signal conditioning electronics of the laser detects the spot position on the receiving element and, following linearisation and additional digital or analogue signal conditioning, provides an output signal proportional to target position. The most critical element in this arrangement is the receiver, which can take one of two forms: a position sensitive device (PSD) or charge coupled device (CCD).PSD triangulation has been around for about 25 years and thus it tends to dominate the field. Under 'ideal' conditions, PSD sensors perform to expectation. However,
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