Light source pulsed with irregular pulse sequence in analog phot

Details Light source pulsed with irregular pulse sequence in analog phot Light source pulsed with irregular pulse sequence in analog phot

1994-06-27

1995-10-31

Rosenberger, Richard A.

Optics: measuring and testing

Of light reflection

With diffusion

356226, G01N 2147, G01J 144

Patent

active

054634679

ABSTRACT:
Method of detecting and evaluating analog photometric signals in a test carrier analysis system, and apparatus for carrying out the method. The test field of a test carrier is irradiated by a light source clocked in light-dark phases. The reflected light is detected by a measurement receiver over a measurement period having several light-dark phases, and integrated. An effective suppression of stray and secondary light, which permits measurement even without the hitherto conventional shielding from ambient light, is achieved by a method in which the sequence of the light and dark phases integrated over the measurement period is irregular in such a way that the Fourier-transformed frequency spectrum includes a large number of different frequencies. Each individual frequency therefore makes only a small contribution to the measurement result.

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"Erzeugung von Pseudo-Zufallsfolgen mit binaren Schieberegistern" (Production of pseudo-random sequences with binary shift registers), published in Electronik, special edition 209, Franzis Verlag, p. 93.

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