【摘要】 本文描述了国内首次研制成功的用于水体混合扩散实验研究的水中荧光计。该仪器采用光源调制和信号同步解调技术,同时使用专用遮光罩使仪器能在任一日光强度下0—50m深度工作。拖曳速度为0—6节,对于罗丹明B的探测范围是1×10^-10—1×10^-6g/cm³。简明叙述讨论了使用LGC2-1A型水中荧光计在不同水质中进行扩散实验的测量结果。更多还原

【Abstract】 A marine diffusion experiment was carried out to measure the space and time distribution of a tracer for the determination of relationships between contaminant and characteristics of the current structure. Luminescent dyes are the most suitable trancers (Rhodamine is one of them) because they are water soluble, cheap, harmless, and detectable in seawater and other waters at extremely low concentrations. For these reasons the luminescent tracer technique is now in general use in marine admixtures dispersion research. To ensure highest accuracy and spatial resolution of tracer content we have developed a LGC2-1A under water fluorometer, the first fluorometer in China.Favorable results were obtained after two years use of this fluorometer. With an incandescent lamp as a light source and a photomultiplier as detector, the meter adopted not only light source modulated and signal synchronous demodulator but also crisscross optical paths which can remove interferomitric signal from environment light. Then spectral in the meter are filtered once more by a interference filters in order to separate effectively fluorescence from scattering light of excited light. The fluorometer can work in any light intensity at surface of water because it has specific lightproof cover. The specialities of the meter are: work depth 0-50 meters under surface of water in any intensity of light; tugspeed 0-6 knots in water; detecting range from 1×10-10 to 1×10-6g/cm3 in water solution of Rhodomine.更多还原