深海原位激光拉曼光谱系统释样设计与海试

Design and sea trial on a sample releasing device used for deep-sea in-situ laser Raman spectroscopy system

为了满足对实验室研制的原位激光拉曼光谱系统的深海环境探测能力的评测要求,设计了一套应用于深海环境的释样装置,该装置分为样品储存释放和样品扩散缓存2部分.将样品罐装到5个样品缸内,随系统下放至深海;在甲板上通过CTD来控制海鸟采水器释放钩来实现样品的释放;释放样品经导管注入扩散缓存装置,以延缓扩散速度,形成稳定化学场,缓存装置的2个窗口可供2个不同的光谱系统进行比对试验.选择合理的释样和光谱采集时序,获得了自带样品信号强度与时延的关系,样品在探测区驻留时间可达2 min.装置被成功用于3次海试,试验结果表明:该装置深海环境工作正常、性能可靠,可针对深海极端环境的化学场特征,为实现各类深海原位光谱探测系统探测能力的评测提供了一个良好的模拟测试环境.

A liquid sample releasing device was developed for the sea trial of a Deep Ocean Compact Automatic Raman Spectrometer system.This device consists of two parts： the sample storing/releasing part and the sample spreading buffer part.The former has 5 sample cells so that as many as 5 different samples may be stored,and each sample may be discharged separately by releasing the corresponding hook of the Seabird water sampler which is controlled by a CTD on deck.The released samples enter into the latter part through PVC pipes,and the buffer part suspends the spreading of the samples in it,thus guaranteeing a relatively stable chemical field.The two windows of the buffer part face the detection zones of the two systems respectively,which make paired comparison tests possible.The delay between the sample releasing and Raman spectra collecting was determined through three sea trials,and the obtained results show that the developed device may offer the systems with a detection time as long as two minutes.The test results show that the device may work in deep sea normally and reliably,it may aim at the chemical field feature under the deep-sea extreme environment,and it provides an excellent simulative testing environment for realizing the assessment and measurement on the probing ability of various deep-sea in-situ spectroscopy systems.