PHOTO-ACOUSTIC AND PHOTO-REFRACTIVE DETECTION OF SMALL ABSORPTIONS IN LIQUIDS
PHOTO-ACOUSTIC AND PHOTO-REFRACTIVE DETECTION OF SMALL ABSORPTIONS IN LIQUIDS
复制标题
DOI：
10.1016/0030-4018(80)90014-0
复制
发表时间：
1980-01-01
影响因子：
2.4
通讯作者：
BELANGER, LJ
中科院分区：
文献类型：
--
作者：
BRUECK, SRJ;KILDAL, H;BELANGER, LJ
脉冲光声和光折射的灵敏度（例如，热透镜）技术用于测量液体中的小折射率已经在理论和实验上进行了评估。电致伸缩限制了这两种技术的灵敏度，这种限制对于光折射技术不太严重。在液氮中，对于200 μm的激光光斑，实验测得的最小吸收常数为4 × 10 ~（-5）cm ~（-1）（光声测量）和6 × 10 ~（-7）cm ~（-1）（光折变测量）。计算得到的电致伸缩极限分别为2 × 10-5cm-1和7 × 10- 11 cm-1。
The sensitivities of pulsed photo-acoustic and photo-refractive (e.g., thermal lensing) techniques for the measurement of small absorptions in liquids have been evaluated both theoretically and experimentally. Electrostriction limits the sensitivity of both techniques, this limitation is less severe for the photo-refractive technique. The minimum absorption constants observed experimentally, for a 200-μm laser spot size in liquid N2, are 4 × 10-5cm-1for the photo-acoustic measurement and 6 × 10-7cm-1for the photo-refractive measurement. The calculated electrostrictive limits are 2 × 10-5cm-1and 7 × 10-11cm-1, respectively.