| US 7,589,303 B2 | ||
| Method of determining and/or evaluating a differential optical signal | ||
| Gerd Reime, Bühl (Germany); Michael Domokos, Kuernbach (Germany); Peter Langer, Karlsruhe-Durlach (Germany); and Egbert Spiegel, Gelsenkirchen (Germany) | ||
| Assigned to Mechaless Systems GmbH, (Germany) | ||
| Appl. No. 10/575,148 PCT Filed Oct. 07, 2004, PCT No. PCT/EP2004/011197 § 371(c)(1), (2), (4) Date Feb. 08, 2007, PCT Pub. No. WO2005/036209, PCT Pub. Date Apr. 21, 2005. |
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| Claims priority of application No. 103 46 741 (DE), filed on Oct. 08, 2003. | ||
| Prior Publication US 2008/0042043 A1, Feb. 21, 2008 | ||
| Int. Cl. G01J 5/02 (2006.01) | ||
| U.S. Cl. 250—205 [356/369; 398/154; 398/137; 398/162] | 14 Claims |
| 1. Method for determining and/or evaluating a differential, optical signal with at least two light sources which emit light
in a sequentially phased manner, and with at least one receiver for receiving a sequentially emitted alternating light component
from the light sources, wherein a light intensity which is irradiated into the measuring arrangement by at least one light
source is regulated such that the sequentially emitted alternating light component, which occurs between different sequential
phases, becomes zero at the at least one receiver (E),
wherein in order to regulate the irradiated light intensity, a incoming signal at the at least one receiver (E) is determined
in terms of polarity, and a correcting variable (R) for controlling the irradiated light intensity is thus produced, and
wherein a value of the polarity is integrated by means of a counter in order to produce the correcting variable.
|