实时脉冲光声法用于分子弛豫时间的测定

南京大学学报(自然科学版) ›› 2013, Vol. 49 ›› Issue (1): 5–12.

实时脉冲光声法用于分子弛豫时间的测定

Markushev Dragan¹，Rabasovic Mihailo¹，Lukic Mladena²
Cojbasic Zarko³，Todorovic Dragan⁴

出版日期:2015-10-16 发布日期:2015-10-16
作者简介: (1 .Institute of Physics，University of Belgrade,Pregrevica 118，Belgrade-Zcmun,Serbia;
2. Faculty of occupational safcty,Univcrsity of Nis,Carnojcvica 10 a, 18000 Nis,Serbia;
3. Mechanical Engineering Faculty, University of Nis,Aleksandra Medvedeva 14，18000 Nis,Serbia;
4.Institute for Multidisciplinary Research,Univcrsity of Belgrade,P.O.Box 33，11030 Belgrade,Serbia)
基金资助:
Ministry of Education and Science o1 the Republic of Serbia(171016,TR035016)

Real-time pulsed photoacoustics-molecular
relaxation time measurements*

Markushev Dragan¹，Rabasovic Mihailo¹，Lukic Mladena²
Cojbasic Zarko³，Todorovic Dragan⁴

Online:2015-10-16 Published:2015-10-16
About author: (1 .Institute of Physics，University of Belgrade,Pregrevica 118，Belgrade-Zcmun,Serbia;
2. Faculty of occupational safcty,Univcrsity of Nis,Carnojcvica 10 a, 18000 Nis,Serbia;
3. Mechanical Engineering Faculty, University of Nis,Aleksandra Medvedeva 14，18000 Nis,Serbia;
4.Institute for Multidisciplinary Research,Univcrsity of Belgrade,P.O.Box 33，11030 Belgrade,Serbia)

摘要/Abstract

摘要： 脉冲光声光谱法一个重要的应用是确定气体分子的振动一平动弛橡时间τv-_^T.因激光光束
的空间分布R(r)对光声测量有显著影响，我们发展了同时测定R(r)和τv一_^T的方法.本方法基于光声
脉冲的实时信号和一种用于光声成像的数学运算法则.本文讨论了智能计算用于多原子气体分子的R
(r)和τv一_^T同时和实时测定的可能性.进一步利用前馈多层神经网络的离线批训练法，结合一个理论光
声信号对R(r)和τv一_^T进行了同时和实时分析.木方法可明显缩短确定上述参数所需时间.

Abstract: Determination of the vibrational-to-translational relaxation time τv-_^T in gases is one of the applications of
pulsed photoacoustic spectroscopy. Because the spatial profile of the laser beam R(r)，can significantly influence the
accuracy of the photoacoustic mcasurements,we developed the method for simultaneous determination of the R(r)，
and τv-_^T，.It is based on the temporal shape of the photoacoustic pulse and utilizes a mathematical algorithm devel
opcd for photoacoustic tomography.The possibilities of computational intelligence application for simultaneous and
real-time determination of R(r)and τv-^_T values of polyatomic molecules in gases by pulsed photoacoustic are also
discussed. Feed forward multilayer perception networks are trained in an offlinc batch training regime to estimate
simultancously,and in real-time,R(r)，(profile shape class)and τv-^_T，from a givcn(thcorctical)photoacoustic signals.
Proposed method significantly shortens the time required for the simultaneous determination of the aforementioned quantities.

Markushev Dragan¹，Rabasovic Mihailo¹，Lukic Mladena²
Cojbasic Zarko³，Todorovic Dragan⁴. 实时脉冲光声法用于分子弛豫时间的测定[J]. 南京大学学报(自然科学版), 2013, 49(1): 5–12.

Markushev Dragan¹，Rabasovic Mihailo¹，Lukic Mladena²
Cojbasic Zarko³，Todorovic Dragan⁴
. Real-time pulsed photoacoustics-molecular
relaxation time measurements*
[J]. Journal of Nanjing University(Natural Sciences), 2013, 49(1): 5–12.

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