Patent ID: 6750953
Filing Date: 2004-06-15
Classification: G01C,G01J

Abstract:
A receiver circuit for determining the position of a laser beam comprising:a photodetector comprising at least one photosensitive device, a first detector output signal and a second detector output signal, the relative amplitudes of said first and second detector output signals related to the position of said beam being swept across and impinging on said photodetector; a first log amplifier communicably coupled to said photodetector operatively configured to compute a first log signal that is based upon a logarithmic calculation utilizing said first detector output signal; a second log amplifier communicably coupled to said photodetector operatively configured to compute a second log signal that is based upon a logarithmic calculation utilizing said second detector output signal; and a processor operatively configured to compute a position of said beam base upon a subtraction of said second log signal from said first log signal.