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Nanosecond Gated PMT for LIDAR-RADAR Applications

机译:用于激光雷达应用的纳秒级门控PMT

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Wide dynamic range gating photosensor modules has been design for LIDAR-RADAR applications on base R7400U (active area 8 mm. diameter) R7600U (active area 18x18 mm.) Hamamatsu photomultiplier tubes. The photomultiplier tubes R7400U, series have two kinds of photocathode: low resistance semitransparent multialkali photocathodes and semitransparent bialkali photocathodes with large resistance. Different kinds of photocathodes require different approach to gating circuits design. High-speed pulse gating (gating rise time 10 nsec, setting time 40 nsec for 99%) has been used for enhancing of target contrast at ocean optic application for both kinds: semitransparent bialkali and semitransparent multialkali photocathodes. Wide dynamic range (50 dB of optical power) has been achieved by optimizing of applied to dynodes voltages. Compression up to 30 dB has been used for following output signal digital processing. Hamamatsu photosensitive modules were used in the two system receivers in pulsed LIDAR system. The system was mounted on the bow of the R/V New Horizon and collected data from August 25 thru September 8, 2005 as part of the LOCO field test in Monterey Bay. Approximately 4 million LIDAR profiles were collected during this period. During the field test the profiles were processed to show relative changes in water optical properties and to reveal water column structure in real time.
机译:宽动态范围门控光电传感器模块已设计用于基座R7400U(有效区域直径8毫米),R7600U(有效区域18x18毫米)Hamamatsu光电倍增管上的LIDAR-RADAR应用。 R7400U系列光电倍增管有两种光电阴极:低电阻的半透明多碱性光电阴极和大电阻的半透明的双碱性光电阴极。不同种类的光电阴极需要不同的门控电路设计方法。高速脉冲选通(选通上升时间为10 ns,设定时间为40 ns,适用于99%)已用于增强海洋光学应用中两种半透明和半透明多碱性光电阴极的目标对比度。通过优化对倍增极电压的施加,可以实现宽动态范围(光功率为50 dB)。高达30 dB的压缩已用于后续的输出信号数字处理。滨松光敏模块被用于脉冲激光雷达系统的两个系统接收器中。该系统安装在R / V New Horizo​​n的船首,并于2005年8月25日至9月8日收集数据,作为蒙特雷湾LOCO现场测试的一部分。在此期间,大约收集了400万激光雷达资料。在现场测试期间,对剖面进行了处理,以显示水的光学特性的相对变化并实时显示水柱结构。

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