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Phase noise compensation for interferometric absolute distance measuring

A technology of absolute distance and distance, applied in the field of computer program products, capable of solving complex problems

Active Publication Date: 2008-02-20
LEICA GEOSYSTEMS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this, the system is more complex due to the presence of two laser sources, although the structural stability of the interferometer, as well as the stability of the distance to the target, is less demanding

Method used

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  • Phase noise compensation for interferometric absolute distance measuring
  • Phase noise compensation for interferometric absolute distance measuring
  • Phase noise compensation for interferometric absolute distance measuring

Examples

Experimental program
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Embodiment Construction

[0073] Figure 1 shows the basic measurement configuration. Signal source SQ is coupled in via optical connectors OV1-OV4 to measuring interferometer MI, reference interferometer RI and optional component calibration unit KE. The target ZI to be measured is an integral part of the measurement interferometer in the measurement. Via optical paths OS2, OS3 and OS4, the signals are transmitted to detector units D2, D3 and D4. The detector signals are sent to the signal processor SP via cables L2, L3 and L4. The signal processor SP is responsible for processing and analyzing the signal and also controls the signal source SQ via the control line SL.

[0074] Figure 2 shows a schematic diagram of an interferometer used to form a heterodyne mixing product. Part of the emitted light is coupled out by the beam splitter 1 , reflected on the reflector 2 and passed through the beam splitter, and superimposed with the light signal scattered back from the reflector 3 . For interferometric...

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Abstract

The method involves transmitting an electromagnetic radiation e.g. laser light, to a target object and receiving the radiation dispersed back by the object and guided over a reference length. The radiation is converted into signals, where tuning characteristics and phase noise of the light are characterized in a reference interferometer. A distance of the object is determined from the signals and under the usage of the length. Independent claims are also included for the following: (1) a computer program product with program code for executing a method for measuring absolute distance of a target object (2) a device for executing a method for measuring absolute distance of a target object.

Description

technical field [0001] The invention relates to an absolute distance measuring method according to the preamble of claim 1 , an absolute distance measuring device according to the preamble of claim 13 , and a computer program product. Background technique [0002] In the field of electronic ranging, various principles and methods are disclosed. One approach is to direct frequency-modulated electromagnetic radiation (such as light) at the target to be measured, and then receive one or more reflected signals from a back-scattering object, ideally only from the target. Here, the target to be measured may not only have specular backscattering characteristics such as mirror characteristics, but also have backscattering characteristics. In a heterodyne interferometer configuration, a tunable laser source is used for absolute distance measurement. In the simplest embodiment in principle, the optical frequency of the laser source is linearly tunable. The received signal is superi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B9/02
CPCG01B9/0207G01B2290/30G01B2290/60G01B9/02004G01B9/02
Inventor 马塞尔·罗纳托马斯·延森
Owner LEICA GEOSYSTEMS AG
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