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Method and apparatus for optoelectronic contactless range finding using the transit time principle

A technology of time-of-flight and distance measurement, which is applied in the measurement of electric quantity/magnetism change measurement proportional to time change, electrical unknown time interval measurement, radio wave measurement system, etc., and can solve problems such as long time periods, Achieve increased effectiveness and considerable cost savings

Active Publication Date: 2013-12-11
PEPPERL FUCHS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this is seen as a disadvantage since a considerable time period is required for this

Method used

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  • Method and apparatus for optoelectronic contactless range finding using the transit time principle
  • Method and apparatus for optoelectronic contactless range finding using the transit time principle
  • Method and apparatus for optoelectronic contactless range finding using the transit time principle

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Embodiment Construction

[0068] The starting signal for time measurement can be obtained in different ways. against Figures 1 to 4 Two of these methods are described. Here, the terms "signal" and "pulse" are occasionally considered to have the same meaning. For the following description of the invention, "pulse" is generally understood to mean an optical signal, while "signal" is used to mean an electrical or electronic signal.

[0069] First, refer to figure 1 with 2 , gives a description of a method in which the initiation signal is derived from an optical initiation pulse. figure 1 A device 100 for non-contact optical distance measurement is shown. In this case, the light source 12 emits light pulses which are conducted via a lens 18 onto an object 14 in a detection region 16 . After reflection on the object 14, said light pulse, now referred to as an echo pulse 30, is passed via the lens 22 to the detector 20 where it is detected. The detector 20 is therefore also referred to as an echo re...

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Abstract

The method involves obtaining digital raw data by comparison of start and echo signals with a digital clock (80). A starting time difference and an end time difference are determined by fine interpolators. An analog signal corresponding to the starting time difference and / or the end time difference is supplied to the interpolators to convert into digital starting and / or end time differences. The data is measured in a determined interval for the starting and end time differences. Adjustments for non-linear and / or drift characteristics of the interpolators are calculated. An independent claim is also included for a device for optoelectronic contactless measuring of distance according to transit-time principle.

Description

[0001] In a first aspect, the invention according to the preamble of claim 1 relates to a method for optoelectronic contactless distance measurement using the transit time principle. [0002] In a second aspect, the invention according to the preamble of claim 13 is directed to a device for optoelectronic non-contact distance measurement using the time-of-flight principle. [0003] Optoelectronic sensors for contactless distance measurement are subdivided into different categories with regard to the method used. [0004] A first possibility to measure range or distance very precisely consists in measuring the phase of transmitted and received waves. In this method, a sine wave is emitted by a laser diode. By comparing the phase of the transmitted wave with the phase of the received wave, the distance can be determined. [0005] In contrast to this, in the pulse transit time method short pulses are emitted by the light source. By measuring the transit time between the emission...

Claims

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Application Information

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IPC IPC(8): G01S7/497G01S17/10G01S7/486G04F10/04G04F10/10G01S17/14G01S7/4865
CPCG01S7/4868G01S17/105G01S7/497G01S7/4865G01S17/14
Inventor 乌韦·扎茨基恩斯特·塔贝尔
Owner PEPPERL FUCHS GMBH