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Method and device for motion compensation in interferometric sensing system

A technology of sensing light and interferometric measurement, which is applied in the direction of measuring devices, adopting optical devices, converting sensor output, etc., and can solve the problems of lowering measurement results

Active Publication Date: 2017-06-09
INTUITIVE SURGICAL OPERATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the system being measured changes during the time the laser sweeps, the resulting measurements may be of degraded quality

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  • Method and device for motion compensation in interferometric sensing system
  • Method and device for motion compensation in interferometric sensing system
  • Method and device for motion compensation in interferometric sensing system

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Embodiment Construction

[0045] The following description presents specific details, such as specific examples, for purposes of explanation and not limitation. It will be understood, however, by those skilled in the art that other embodiments may be used that depart from these specific details. In some instances, detailed descriptions of well-known methods, interfaces, circuits, and devices are omitted so as not to obscure the description with unnecessary detail. In some figures, separate blocks are shown. Those skilled in the art will appreciate that the functions of these blocks may be implemented by using independent hardware circuits, using software programs and data in conjunction with a suitable programmable digital microprocessor or general purpose computer, and / or using application specific integrated circuits (ASICs) and and / or implemented using one or more digital signal processors (DSP). Software program instructions and data may be stored on non-transitory computer-readable storage media...

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Abstract

Optical interrogation systems such as OFDR-based systems measure local changes in the refractive index of a sensing optical waveguide subjected to time-varying disturbances. The interferometric signals detected for a length of sensing optical waveguide are transformed into the spectral domain. A time-varying signal is determined from a transformed interferometric dataset. A compensation signal is determined from the time-varying signal, the compensation signal being used to compensate for time-varying disturbances for the interferometric dataset. Further robustness is achieved through the use of averaging and strain compensation. This compensation technique can be applied along the length of the optical waveguide.

Description

[0001] This application claims priority to U.S. Provisional Patent Application Serial No. 61 / 566,860, filed December 5, 2011, and U.S. Provisional Patent Application Serial No. 61 / 614,662, filed March 23, 2012, the contents of which are incorporated by reference This article. technical field [0002] The present invention relates to interferometric sensing applications. One example application is an optical frequency domain reflectometry (OFDR) sensing application. Background technique [0003] Optical frequency domain reflectometry (OFDR) has proven to be an effective system for measuring strain in optical fibers with high spatial resolution. See, for example, US Patents 6,545,760, 6,566,648, 5,798,521 and 7,538,883. This high-resolution performance has proven useful in shape-sensing applications. See, for example, US Patents 7772541, 7781724 and US Patent Application 20110109898. A simple strain sensing application in a single core fiber is described in US patent appli...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B9/02G01N21/45
CPCG01D5/353G01B9/02004G01B9/0209G01B9/02069G01L1/242G01B9/02076G01B9/02072G01B9/02083G01M11/3172G01B11/18G01D5/35358G01D5/35329G01B9/0207G01D5/3537G01B11/0658
Inventor M·E·佛罗凯特A·K·桑D·K·吉福德J·W·克莱因
Owner INTUITIVE SURGICAL OPERATIONS INC