共查询到20条相似文献,搜索用时 15 毫秒
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An immersible fiber-optic fluorometer is used to investigate the sea water composition and the phytoplankton content at various depths. Owing to the design features of its immersed part, the fluorometer is capable of making continuous measurements at a widely varying water illuminance. A procedure for calculating the basic structural components of the immersed module is described. Results of laboratory testing of the fluorometer are presented. 相似文献
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Time-dependent fluorescence processes can be investigated using a phase fluorometer with variable frequency. The high cutoff frequency of 500 MHz leads to a time-resolving power of about 1 ps. 相似文献
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S. S. Voznesenskii E. L. Gamayunov A. Yu. Popik A. A. Korotenko 《Instruments and Experimental Techniques》2014,57(3):330-335
A fluorometer model designed at the Institute of Automatics and Control Processes and intended for measuring phytoplankton photosynthesis parameters and chlorophyll-a concentration in sea water in vivo in a wide range of depths, is described. The feature of the fluorometer is the use of fiber-optic sensors for measuring fluorescence, temperatures, and depths. The structure and design of the fluorometer is described. The measurement results of photosynthesis parameters, obtained in a series of expeditions in the Sea of Japan in autumn 2012, are discussed. 相似文献
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多波长LED阵列光源叶绿素荧光探测仪电路的单片机实现 总被引:2,自引:1,他引:2
构建了一种新的浮游植物分类检测仪器——多波长LED阵列光源叶绿素荧光探测仪,系统利用调制的多波长LED阵列作为激发光源,测量各个LED激发下总的叶绿素a的荧光强度信号以及水温、水深。介绍了仪器的原理,重点介绍了这个仪器的电路设计:以ADI公司的ADuC841作为微处理器,通过设计合理的光源调制电路,荧光峰值检测电路和数据的采集、处理与存储电路,实现了对浮游植物浓度进行快速、实时、原位和分类测量。系统采样速度快、精度高,而且直接利用电池供电,功耗极低。 相似文献
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A Video Pyrometer 总被引:2,自引:0,他引:2
G. A. Tsyba V. G. Salamatov V. L. Polyakov 《Instruments and Experimental Techniques》2003,46(4):480-483
A pyrometric device based on a consumer color digital video camera and a personal computer is described. A procedure for the study of thermodynamic processes is offered. The measured temperature range is 800–2500°C, and the measurement error is 50°C. 相似文献
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本文讨论跟踪测量电视系统中的视频模拟信号的数字化及采用门限存储保留和比较保留法对数字化的数据进行实时处理和存储的问题。 相似文献
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介绍了利用图像处理与机器视觉技术实现交通车辆视频测速的方法,提出了系统的软件和硬件构架,给出了关键算法。通过视频图像的采集实现了运动车辆的速度检测,对背景估计、运动检测、目标分割、目标位置确定、目标跟踪等方法提出了相应的计算方法和计算公式。在检测方法上解决了帧差运动检测中的噪声污染问题;利用了神经元网络对目标实际位置进行计算,同时运用了相应的预测方法,解决了目标跟踪的稳定性问题。这种视频测速技术的成功研究,降低了车辆测速器的制作成本。 相似文献
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建立TDI-CCD相机系统的噪声模型,分析了TDI-CCD视频信号读出复位噪声的产生机理,讨论了相关双采样技术的工作原理。给出了TDI-CCD相机视频处理电路各个组成部分的设计,并进行了分析。在此基础上设计了科学级TDI-CCD相机,实验结果表明,该视频处理电路在本身引入噪声较小的同时,有效地抑制了暗电流、复位噪声、1/f等噪声,数据输出速率在50MHz时,整机信噪比(S/N)在50dB以上。 相似文献
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An efficient technique for calibrating video cameras to record optical density (OD) from microscopic images is described. The method corrects for variation over the field of the brightfield and darkfield intensities, does not assume a linear response of the camera to the incident intensity and requires a single calibration filter. 相似文献