Spear J D, Russo R E, Silva R J
Appl Opt. 1990 Oct 1;29(28):4225-34. doi: 10.1364/AO.29.004225.
An analytical model that incorporates effects of light scattering was developed for dual-beam photothermal deflection spectroscopy. Thermal gradients induced by a modulated excitation beam deflect an optical probe beam which was treated as being of finite dimensions. Mechanisms by which thermal gradients produce refractive index gradients are discussed, with an explicit expression for dn/dT being derived. Experimental studies with suspensions of small latex particles in Nd(3+) solutions demonstrated that the model accurately predicts both the shape of the deflection signal and the attenuation of the signal due to light scattering. The absolute magnitude of the observed signal is approximately predicted by theory.
针对双光束光热偏转光谱法，开发了一种包含光散射效应的分析模型。调制激发光束所诱导的热梯度使被视为具有有限尺寸的光学探测光束发生偏转。讨论了热梯度产生折射率梯度的机制，并推导出了dn/dT的显式表达式。用小乳胶颗粒在钕（3+）溶液中的悬浮液进行的实验研究表明，该模型能准确预测偏转信号的形状以及由于光散射导致的信号衰减。理论大致预测了观测信号的绝对大小。
