Method and device for obstacle detection and distance measurement by infrared radiation

  • US 20040088079A1
  • Filed: 11/14/2003
  • Published: 05/06/2004
  • Est. Priority Date: 01/26/2001
  • Status: Abandoned Application
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First Claim
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1. Method for the detection and measurement of the distance between a first object (1) and a second object (2), the said method being such that it includes the following steps:

  • a) The step of emitting an infrared radiation (3) from an emitter (4) affixed to the said first object (1) and fed by an electric emission signal, and b) the step of detecting the return of the said infrared radiation to a receiver (5), after the said infrared radiation has been reflected by the said second object (2);

    the said receiver (5) being affixed to the said first object (1) close to the said emitter (4) and producing an electrical signal of reception;

    the said process being characterized in that it furthermore includes the following steps;

    c) the step of gradually varying the infrared radiation power emitted by the said emitter (4) by controlling the said electrical emission signal, until the power of the infrared radiation emitted attains a detection power (PS) such that, for this detection power (PS) the infrared radiation is detected by the said receiver (5) after reflection by the second object, d) the step of calculating the distance (D) between the said first object (1) and the said second object (2) starting out from the value of the said detection power (PS), by establishing a correlation, particularly by calibration, between the said distance (D) and the said detection power.

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