Russo Stefano Dello, Zifarelli Andrea, Patimisco Pietro, Sampaolo Angelo, Wei Tingting, Wu Hongpeng, Dong Lei, Spagnolo Vincenzo
Opt Express. 2020 Jun 22;28(13):19074-19084. doi: 10.1364/OE.393292.
We report on a study of light-induced thermo-elastic effects occurring in quartz tuning forks (QTFs) when exploited as near-infrared light detectors in a tunable diode laser absorption spectroscopy sensor setup. Our analysis showed that when the residual laser beam transmitted by the absorption cell is focused on the QTF surface area where the maximum strain field occurs, the QTF signal-to-noise ratio (SNR) is proportional to the strain itself and to the QTF accumulation time. The SNR was also evaluated when the pressure surrounding the QTF was lowered from 700 Torr to 5 Torr, resulting in an enhancement factor of ∽4 at the lowest pressure. At 5 torr, the QTF employed as light detector showed an SNR ∽6.5 times higher than that obtained by using a commercially available amplified photodetector.
我们报告了一项关于石英音叉（QTF）在可调谐二极管激光吸收光谱传感器装置中用作近红外光探测器时所产生的光致热弹性效应的研究。我们的分析表明，当吸收池透射的残余激光束聚焦在QTF表面出现最大应变场的区域时，QTF的信噪比（SNR）与应变本身以及QTF的累积时间成正比。当QTF周围的压力从700托降低到5托时，也对SNR进行了评估，在最低压力下得到了约4倍的增强因子。在5托时，用作光探测器的QTF的SNR比使用市售放大光电探测器时获得的SNR高约6.5倍。
