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Impulse optical spectrometer based on optical fiber dispersion and measuring method thereof

A fiber optic dispersion and spectrometer technology, which is applied in the spectrometer and measurement field for measuring pulse spectral signals, can solve the measurement of difficult pulse spectral signals with fast, highly sensitive spectral resolution and can be flexibly adjusted, and is not suitable for measuring instantaneously changing optical pulses and spectra at the same time. Long measurement period and other problems, to achieve the effect of good measurement consistency, simple structure and good shock resistance

Inactive Publication Date: 2009-06-24
OCEAN UNIV OF CHINA
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Problems solved by technology

The photomultiplier tube has the advantages of high sensitivity and fast response time, but it needs to match the mechanical scanning parts for spectral measurement; due to the long spectral measurement cycle, it is not suitable for simultaneous measurement of the entire spectrum of instantaneously changing light pulses
[0006] The above methods and structures have limitations, and it is difficult to perform fast, high-sensitivity, and flexible-adjustable spectral resolution measurements of pulsed spectral signals

Method used

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  • Impulse optical spectrometer based on optical fiber dispersion and measuring method thereof
  • Impulse optical spectrometer based on optical fiber dispersion and measuring method thereof
  • Impulse optical spectrometer based on optical fiber dispersion and measuring method thereof

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Embodiment Construction

[0024] The object of the present invention is to provide a spectrometer for measuring pulsed spectral signals, so as to solve the technical problems in related fields.

[0025] Examples of the present invention are figure 1 shown. figure 2 shown in contains different light wavelengths (λ 1 ,λ 2 ,λ 3 ,...,λ n ) light pulses are coupled in from end A of the optical fiber (1) and output from end B of the optical fiber (1). Due to the material dispersion of the optical fiber (1), the output optical signal is image 3 The light pulse sequence shown. The light pulse sequence is input into a single photosensor (2). The single photoelectric sensor (2) can adopt a photomultiplier tube or an avalanche photodiode or the like. The output of the photoelectric sensor (2) is connected to an external computer through a data acquisition and interface circuit, and the spectral data is stored or displayed to realize the function of a pulse spectrometer.

[0026] The spectral resolution...

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Abstract

The invention discloses a pulse spectrograph based on optical fiber dispersion and a measuring method thereof. A section of optical fiber characterized by large material dispersion and small mode dispersion and waveguide dispersion is taken as a spectrum light-splitting device with a simple optical system and no adjustable mechanism; and the spectral resolution can be adjusted by changing the length of the optical fiber or the sampling time interval of a data acquisition system. By utilizing a simplex photodetector to measure spectrum without a scanning mechanism, the spectrograph has the advantages of simple structure, good measuring consistency, and low requirements for working conditions. The invention is applicable to the measurement of the spectrums of pulsed light signals, such as pulsed laser fluorescence spectrum measurement, pulsed laser Raman spectral measurement and the like.

Description

technical field [0001] The invention relates to a pulse spectrometer and a measuring method based on optical fiber dispersion, in particular to a spectrometer and a measuring method suitable for measuring pulse spectrum signals. Background technique [0002] The application of spectral measurement is becoming more and more common, and there is a wide demand for the measurement of pulsed spectral signals using pulsed lasers as light sources. Existing spectrometers mostly use the following methods or structures: [0003] 1. Spectrum splitting devices use gratings, and common structures include single grating, double grating, and triple grating. In order to achieve the purpose of spectral splitting, matching optical devices such as slits and mirrors and specially designed optical paths are also required. The spectral resolution is mainly determined by the structural parameters of the grating and the size of the photosensitive surface of the photoelectric sensor, and it is dif...

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Application Information

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IPC IPC(8): G01J3/28G01J11/00G02B6/42
Inventor 刘金涛张凯临姚玉玲葛玉荣
Owner OCEAN UNIV OF CHINA
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