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A video plankton recorder (VPR) is towed underwater video microscope system, which photographs small to fine-scale structure of plankton, from 50 micrometers and up to a few centimeters in size.〔Benfield, M.C., et al Video Plankton Recorder estimates of copepod, Pteropod and larvacean distributions from a stratified region of Georges Bank with comparative measurements from a MOCNESS sampler. Deep Sea Research Part II: Topical Studies in Oceanography, 1996. 43(7-8): p. 1925-1945〕〔Anonymous. Video Plankton Recorder (VPR). 2010 (2010 10/25/2010 ); Available from: http://www.whoi.edu/instruments/viewInstrument.do?id=1007#1034.〕 A VPR consists of five general components: cameras (with magnifying optics 〔Cabell, D. and G. Scott. The Video Plankton Recorder. 1993; 3:[Available from: http://www.usglobec.org/newsletter/news3/news3.contents.html.〕), strobe, additive sensor and flight control, underwater platform and interface software for plankton identification.〔Davis, C.S., et al., A three-axis fast-tow digital video plankton recorder for rapid surveys of plankton taxa and hydrography. Limnology and Oceanography: Methods, 2005. 3(FEB.): p. 59-74. 〕 ==Technical aspects== In order to obtain high-quality and low-noise images, charge-coupled device (CCD) sensors are used in the camera system. In the early design system, the CCD cameras were mounted in one of the arm of the platform. The developments in the recent years made the cameras system possible to be mounted in the platform body along with other sensors and flight control. The magnification power on the cameras should be vary, with high magnification power on the camera, we can obtain detail observation result on the plankton sample, such as protozoan that has <1 µm resolution . In other hand, the high magnification is able to identify plankton into genus level while low magnification of the camera will provide the rare and larger taxa. The xenon strobe (red-filtered 80 W) provides the VPR systems with the Lighting to support the work of the video camera. It is placed in the other side of the platform arm. This design is intended to provide the area between camera and strobe as undisturbed water volume for continuous observation in the VPR system. As a complex system, VPR can also carry several oceanographic sensors in the same time such as, CTD, transmissometer, fluorometer and flowmeter. These sensors enable the system to measure temperature, conductivity, depth, flow measurement, fraction of light in the water and the fluorescence. The housing or platforms for this instrument is varying depend on the purpose of the survey. These are the particular platform that has been tested and used to mount the VPR: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Video plankton recorder」の詳細全文を読む スポンサード リンク
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