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基于帶通濾波器的透射率起伏信號頻譜特征

Characteristics of Transmission Fluctuation Frequency Spectrum with Band-Pass Filters

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摘要

透射率起伏頻譜測粒技術是根據透射光起伏信號的頻譜特征發展起來的一種新的顆粒測量方法, 可用于實時在線測量。研究基于一階帶通濾波器的透射率起伏信號的頻譜特征, 重點分析帶通濾波器帶寬因子對透射率起伏頻譜及其反演結果的影響。同時還考慮了無因次光束直徑對透射率頻譜的影響。結果表明選擇較小的帶寬因子α有利于提高測量結果的顆粒粒徑分辨率, 但是帶寬因子α過小會降低透射率起伏頻譜的強度從而導致測量產生誤差; 反之, 選擇較大的帶寬因子α有利于獲得較強的透射率起伏頻譜信號, 但是帶寬因子α過大會降低測量結果的顆粒粒徑分辨率。

Abstract

The transmission fluctuation spectrometry (TFS) is a new method based on the spectral characteristics of the transmission fluctuation spectra, which is developed recently for real-time, online/inline particle analysis in two-phase flow. Both the particle size distribution and concentration can be measured simultaneously. The characteristics of the transmission fluctuation spectra with the 1 st order band-pass filters is presented detailedly. The effects of the filter band width parameter on the spectrum and on the inversion results are analyzed together with the effects of the dimensionless beam diameter (beam-to-particle diameter ratio). Numerical calculation and experiments show that a small value of band width parameter can improve the resolution of measurements but reduce the strength of the spectrum and hence bring errors into the results. On the contrary, a big value of band width parameter is beneficial to obtain a strong spectrum but lead to low resolution of measurement.

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補充資料

中圖分類號:O436.2;TB46

DOI:10.3788/aos20103011.3184

所屬欄目:儀器,測量與計量

基金項目:國家自然科學基金(NSFC50876069和NSFC50836003)資助課題。

收稿日期:2009-12-31

修改稿日期:2010-02-08

網絡出版日期:0001-01-01

作者單位    點擊查看

許亞敏:上海理工大學能源與動力工程學院, 上海 200093
沈建琪:上海理工大學理學院, 上海 200093
蔡小舒:上海理工大學能源與動力工程學院, 上海 200093

聯系人作者:許亞敏([email protected])

備注:許亞敏(1981-), 女, 博士研究生, 主要從事光學測量方面的研究。

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引用該論文

Xu Yamin,Shen Jianqi,Cai Xiaoshu. Characteristics of Transmission Fluctuation Frequency Spectrum with Band-Pass Filters[J]. Acta Optica Sinica, 2010, 30(11): 3184-3190

許亞敏,沈建琪,蔡小舒. 基于帶通濾波器的透射率起伏信號頻譜特征[J]. 光學學報, 2010, 30(11): 3184-3190

被引情況

【1】秦授軒,蔡小舒,馬力,于彬. 基于Gregory理論的光脈動法顆粒在線測量中背景光強的估算. 光學學報, 2011, 31(8): 812007--1

【2】張秋長,沈建琪,王華睿,陳先慶. 基于帶通濾波片的激光二極管自混頻納米顆粒干涉測量技術. 光學學報, 2012, 32(5): 512001--1

【3】劉曉艷,申晉,朱新軍,孫賢明,劉偉. 動態光散射技術的角度依賴性. 光學學報, 2012, 32(6): 629002--1

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