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基于带通滤波器的透射率起伏信号频谱特征

Characteristics of Transmission Fluctuation Frequency Spectrum with Band-Pass Filters

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摘要

透射率起伏频谱测粒技术是根据透射光起伏信号的频谱特征发展起来的一?#20013;?#30340;颗粒测量方法, 可用于实时在线测量。研究基于一阶带通滤波器的透射率起伏信号的频谱特征, 重点分析带通滤波器带宽因子对透射率起伏频谱及其反演结果的影响。同?#34987;?#32771;虑了无因次光束?#26412;?#23545;透射率频谱的影响。结果表明选择较小的带宽因?#24212;?#26377;利于提高测量结果的颗粒粒径分辨率, 但是带宽因?#24212;?#36807;小会降低透射率起伏频谱的强度从而导致测量产生误差; 反之, 选择较大的带宽因?#24212;?#26377;利于获得较强的透射率起伏频谱信号, 但是带宽因?#24212;?#36807;大会降低测量结果的颗粒粒径分辨率。

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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中图分类号:O436.2;TB46

DOI:10.3788/aos20103011.3184

所属栏目:仪器,测量与计量

基金项目:国家自然科学基金(NSFC50876069和NSFC50836003)资助课题。

收稿日期:2009-12-31

修改稿日期:2010-02-08

网络出版日期:0001-01-01

作者单位    点击查看

许亚敏:上海理工大学能源与动力工程学院, 上海 200093
沈建琪:上海理工大学理学院, 上海 200093
蔡小舒:上海理工大学能源与动力工程学院, 上海 200093

联系人作者:许亚敏([email protected])

备注:许亚敏(1981-), 女, 博士研究生, 主要从事光学测量方面的研究。

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引用该论文

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

许亚敏,沈建琪,蔡小舒. 基于带通滤波器的透射率起伏信号频谱特征[J]. 光学学报, 2010, 30(11): 3184-3190

被引情况

【1】秦授轩,蔡小舒,马力,于彬. 基于Gregory理论的光脉动法颗粒在线测量中背景光强的?#28010;? 光学学报, 2011, 31(8): 812007--1

【2】张秋长,沈建琪,王华睿,陈先庆. 基于带通滤波片的激光二极管自混?#30340;擅卓?#31890;干涉测量技术. 光学学报, 2012, 32(5): 512001--1

【3】刘晓艳,申晋,朱新军,孙贤明,刘伟. 动态光散射技术的角度?#35272;?#24615;. 光学学报, 2012, 32(6): 629002--1

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