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Method for detecting optical and physical thickness of optical transparent body

A technology of optical transparency and physical thickness, which is applied in the direction of measuring devices, optical devices, instruments, etc.

Inactive Publication Date: 2004-06-02
美国飞泰尔有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Method (c) is not suitable for carrying out on fiber drawing equipment

Method used

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  • Method for detecting optical and physical thickness of optical transparent body
  • Method for detecting optical and physical thickness of optical transparent body
  • Method for detecting optical and physical thickness of optical transparent body

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Embodiment Construction

[0035] We present a new technique that analyzes the reflection of broad-spectrum pulses reflected from the side of the fiber in the spectral domain to deduce the fiber's dimensions. This approach is easy to implement and can provide an order of magnitude higher accuracy than currently employed techniques.

[0036] figure 1 Explain the principle of this measurement technique. Lens L1 is used to focus the broadband pulse from the mode-locked laser onto the side of the fiber to be measured. The light reflected from the fiber is collected by L1 and directed by the beam splitter B.S. to another lens L2, which focuses the beam into the fiber F. The output of fiber F is fed into a spectrometer where the spectrum is recorded on a charge-coupled device (CCD). Analysis of this spectrogram allows the dimensions of the fiber to be deduced.

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Abstract

This invention is characterized in that a wide-band optical signal is transmitted to the object, in a direction related to the parameter to be measured, a pair of reflected signals consisting of a surface reflected signal closer to the object and a surface reflected signal more distant to the object are captured, optical separation between a pair of the reflected signals is decided and a beat frequency is decided by comparing the signals in a spectral region, and the absolute physical thickness of the object is decided by dividing the optical path length by the known refractive index.

Description

technical field [0001] The present invention relates to a method of measuring optically transparent bodies such as optical fibers. Background technique [0002] Fiber Drawing [0003] In the fiber drawing process, in order to understand, predict and control the properties of the fiber and the influence of these properties on signal transmission, it is necessary to accurately characterize the dimensions of the fiber. [0004] The technologies currently used are either low-precision, or cannot implement online monitoring and control in a production environment. [0005] Most draw towers use commercially available devices based on shadow technology to measure the diameter of the fiber. This method scans the fiber transversely with a laser beam, and obtains the size of the fiber by analyzing the change of light transmission [1]. This technique has an accuracy of about 0.1 micron and requires averaging, which makes the measurement very slow. FOCSL [2, 3] (Fiber Fiber Characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02C03B37/018C03B37/025G01B11/06G01B11/08G01B11/10G01B11/12
CPCG01B11/12C03B37/0253C03B2207/70C03B37/01807G01B11/105
Inventor 加斯加撒帕拉
Owner 美国飞泰尔有限公司