光学精密工程2018，Vol.26Issue(1)：8-13,6.DOI:10.3788/OPE.20182601.0008
小型高灵敏度水下拉曼光谱系统
A compact underwater Raman spectroscopy system with high sensitivity
摘要
Abstract
In order to reduce the volume and weight of the underwater Raman system,and to improve its portability and detection sensitivity,a compact underwater Raman spectroscopy system with high sensitivity was developed and assessed.Through elaborate selection of components,a compact structural design was realized with both the weight and the volume well controlled.The size of the main body was kept at 795 mm in length and 260 mm in diameter,with a weight of 548 N,one third of the weight of reported DORISS(the first deep ocean Raman in-situ spectroscopy system).The laser was housed in the optical probe rather than in the main body,hence higher excitation efficiency was achieved with high power density.There are two advantages to put the laser head in the probe.A desirable excitation power density could be obtained without the consumption of laser beam during transmission in fiber,and better signal to noise ratio could be achieved without the stray light raised by the interaction of laser and optical fiber.In addition,300 mW powered laser,efficient volume phase holographic grating and TEC cooled CCD detector were used to improve the system performance.The experimental results show that the LOD(limit of detection)of SO2 -4 was less than 0.4 mmol·L-1.It's about four times than the value achieved by DORISS.Meanwhile the system can be used to identify minerals.All above prove the system to be highly potential in ocean exploration.关键词
拉曼光谱/水下原位探测/小型化/高灵敏度Key words
Raman spectroscopy/underwater in-situ detection/compact/high sensitivity分类
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刘庆省,郭金家,杨德旺,司赶上,郑荣儿..小型高灵敏度水下拉曼光谱系统[J].光学精密工程,2018,26(1):8-13,6.基金项目
国家重点研发计划资助项目(No.2016YFC0302101) （No.2016YFC0302101）
国家自然科学基金资助项目(No.61575181) （No.61575181）
