Opt Lett. 2020 Jul 1;45(13):3427-3430. doi: 10.1364/OL.394637.
A method of remote optical absorption spectroscopy is described that utilizes the photoacoustic remote sensing detection technique. A nanosecond tunable excitation source is used to excite thermo-elastic pressure-induced elasto-optic modulations within targets across a wide wavelength range from 210 to 680 nm, providing optical absorption contrast. These modulations are read remotely as back-reflected intensity variations within a continuous-wave 1310 nm detection beam. The absorption spectra of several samples including dyes and biological macromolecules are captured with an 8 mm working distance in reflection-mode without the use of containment chambers or acoustic detection. This represents an initial investigation into the characteristics of this technique, which may facilitate optical absorption measurement within previously inaccessible sample types due to their size or opacity.
描述了一种利用光声遥感检测技术的远程光吸收光谱方法。使用纳秒可调谐激发源在 210 至 680nm 的宽波长范围内激发热弹压力诱导的弹光调制，提供光学吸收对比。这些调制作为连续波 1310nm 检测光束中的背反射强度变化被远程读取。通过反射模式，在无需使用容纳室或声学检测的情况下，在 8mm 的工作距离内捕获了包括染料和生物大分子在内的几种样品的吸收光谱。这代表了对该技术特性的初步研究，由于其尺寸或不透明性，该技术可能有助于对以前无法进入的样品类型进行光学吸收测量。
