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Distance measurement sensor

A distance measurement and sensor technology, applied in the field of distance measurement sensors

Active Publication Date: 2007-10-17
BEA SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To this extent, it describes a method that provides range of variation detection when using a single dual diode detector, however it is only for a single detection spot

Method used

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  • Distance measurement sensor

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Embodiment Construction

[0026] Accompanying drawing 1 represents the photoelectric distance measurement sensor based on the principle of infrared triangulation. IR light emitting diodes 10 and 12 as transmitters, which generate two infrared (IR) beams 18 and 20, and a transmitter lens 14 for projecting light spots 22 and 26 respectively on an object 24 such as the ground. The first LED 10 is positioned on the optical axis 16 of the first lens 14 ; the second LED 12 is positioned eccentrically to the optical axis 16 . The first light-emitting diode 10 generates a first light beam 18 which is projected onto a first light spot 22 on an object 24 . The second light-emitting diode 12 generates a second light beam 20 projected onto a second light spot 26 on the object 24 .

[0027] Specifically, when the photoelectric distance measuring sensor is applied to an automatic door opening and closing device, the object is the ground. Beams 18 and 20 reflect off object 24 and are received by PSD 30 as a receive...

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Abstract

A measurement sensor comprising a PSD ( 30 ) as an optoelectronic receiver, a transmitter ( 10, 12 ) for generating spots ( 22, 26 ), optics ( 14, 32 ) for reproducing the spots ( 22', 26 ') on the PSD ( 30 ) and means ( 44, 46, 48, 50, 52 ) for processing output signals (I 1 , I 2 ) generated by said PSD ( 30 ) and for controlling the transmitter ( 10, 12 ) depending on the processed output signals (I 1 , I 2 ) in order to measure the distance between the target ( 24 ) and the sensor by a triangulation technique is disclose closed. The transmitter comprises at least two optoelectronic signal sources ( 10, 12 ) for projecting at least two spots ( 22, 26 ) independent from each other on a target ( 24 ), the means ( 44, 46, 48, 50, 52 ) comprising a digitally controlled potentiometer ( 48 ) for balancing the output signals (I 1 , I 2 ) and a digital processor ( 52 ) adapted for controlling the potentiometer ( 48 ).

Description

technical field [0001] The invention relates to a distance measuring sensor and a distance measuring method. Background technique [0002] Most of the known photoelectric distance measuring sensors commonly used for automatic doors are based on the triangulation principle. A transmitter LED and corresponding lens emits a spot of infrared (IR) light onto the ground, and a receiver positioned at a given distance from the transmitter measures the angle between the transmitted and received IR rays. This angle is directly related to the target distance and is measured by the position of the receiving light spot on the receiving sensing device. [0003] The sensing device usually consists of a pair of photodiodes separated by a very thin border, or a single position sensing device, position sensitive device or position sensitive detector (commonly referred to as PSD). The pair of photodiodes are used to determine where the light spot is reflected onto the diodes. By measuring t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/46G01B11/00G01C3/06G01S7/481G01S7/486
CPCG01S7/486G01S7/481G01S7/4814G01S17/48
Inventor 埃曼努埃尔·尤贝伦
Owner BEA SA