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Scattering photoacoustic method in measurement of weakly absorbing turbid suspensions

机译：散射光声法测量弱吸收浑浊悬架

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摘要

Conventional photoacoustic techniques in composition determination and biomedical diagnose and imaging are based on the optical absorption in target substance or objects from which the photons to be scattered are not concerned. It is obvious that the intensities of scattered lights closely relate to the property of the interrogated substance, therefore measuring the signals produced by them can give rise to more information of the substance. Based on this idea, a novel method entitled scattering photoacoustic (SPA) method is put forward to study weak absorption suspensions with highly scattering. In this method, a near infrared pulse laser irradiates the studied object which contacts with external absorbers, resulting the generation of a few photoacoustic signals; one is produced in the studied object as conventional case, others are in external absorbers which are produced by the scattered photons. All these signals are successively received by a piezoelectric detector with short damping period. Analyzing these signals is capable of determining reduced scattered coefficient and absorption coefficient, as well as acoustic attenuation of studied suspensions. Some measurement results in intralipid and fibre (paper pulp) suspensions are given rise to in the end.
机译：组成测定和生物医学诊断和成像中的常规光声技术基于目标物质或物体中的光学吸收，从中散射的光子不涉及。显然，散射灯的强度与询问物质的性质密切相关，从而测量它们产生的信号可以产生更多的物质信息。基于该思想，提出了一种题为散射光声（SPA）方法的新型方法，以研究高度散射的弱吸收悬浮液。在该方法中，近红外脉冲激光照射了与外部吸收器接触的研究对象，从而产生一些光声信号;在研究的物体中产生作为传统情况，其他物体在外部吸收器中由散射的光子产生。所有这些信号通过压电检测器连续接收，其中阻尼周期短。分析这些信号能够确定降低的散射系数和吸收系数，以及所研究的悬浮液的声学衰减。在脑内和纤维（纸浆）悬浮液中的一些测量结果将升至末端。

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