Particle Concentration Measurements during Fast Recording of Absorption Spectra

IF 1.1 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

Physics of Wave Phenomena Pub Date : 2023-03-27 DOI:10.3103/S1541308X23010089

A. I. Volkova, V. V. Lagunov, V. N. Ochkin

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引用次数: 1

Abstract—

The applicability of the light absorption method for measuring particle concentrations during fast recording of absorption spectra in different ranges of frequency tuning rates and in different measurement schemes has been considered. If the molecular resonance time is shorter than the decay times of induced particle polarization in the open space of the medium, scanning of the transmission radiation frequency is accompanied by well-known transient coherent effects, the stationary spectrum is distorted, and oscillations arise. In this case the conventional total absorption methods can hardly be applied directly. A method based on reconstructing the stationary spectrum from the wing of the experimentally observed absorption line is proposed. When carrying out highly sensitive measurements of absorption in the medium inside of a high-Q external optical cavity, absorption line distortions arise as well, but at much lower frequency tuning rates. The observed spectra exhibit asymmetry, oscillations are not observed, and the violation mechanism is related in this case to the limitation of the probe-light coherence length (in comparison with the effective optical path length) and finite photon lifetime in the cavity. It is shown that direct application of the classical relations linking the total absorption with the particle concentration yields adequate results in this situation. The role of instrumental distortions in integral measurements is discussed.

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吸收光谱快速记录中粒子浓度的测量

摘要:研究了光吸收法在不同频率调谐速率范围和不同测量方案下快速记录吸收光谱时测量粒子浓度的适用性。如果分子共振时间短于介质开放空间中诱导粒子极化的衰减时间，则透射辐射频率的扫描伴随着众所周知的瞬态相干效应，静止谱被扭曲，并产生振荡。在这种情况下，常规的全吸收方法很难直接应用。提出了一种基于实验观测吸收线翼重构固定光谱的方法。当对高q外光腔内介质的吸收进行高灵敏度测量时，也会出现吸收线畸变，但频率调谐率要低得多。观察到的光谱表现出不对称性，没有观察到振荡，并且在这种情况下，破坏机制与探测光相干长度(与有效光程长度相比)的限制和腔内有限的光子寿命有关。结果表明，在这种情况下，直接应用总吸收与粒子浓度之间的经典关系可以得到适当的结果。讨论了仪器畸变在积分测量中的作用。

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来源期刊

Physics of Wave Phenomena PHYSICS, MULTIDISCIPLINARY-

CiteScore

2.50

自引率

21.40%

发文量

审稿时长

>12 weeks

期刊介绍： Physics of Wave Phenomena publishes original contributions in general and nonlinear wave theory, original experimental results in optics, acoustics and radiophysics. The fields of physics represented in this journal include nonlinear optics, acoustics, and radiophysics; nonlinear effects of any nature including nonlinear dynamics and chaos; phase transitions including light- and sound-induced; laser physics; optical and other spectroscopies; new instruments, methods, and measurements of wave and oscillatory processes; remote sensing of waves in natural media; wave interactions in biophysics, econophysics and other cross-disciplinary areas.