A real-time data acquisition system for the NASA Airborne Laser Polarimeter Sensor (ALPS)

6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI:10.1109/IMTC.1989.36825

G.C. Elman, J.E. Kalishoven, P. Dabney

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引用次数: 1

Abstract

An ASYST-based real-time data-acquisition system for measurement of the depolarization properties of various materials on the Earth's surface is described. The ALPS system is flown in a NASA P3 and uses an Nd:YAG laser pulsed at 20 Hz to irradiate the Earth's surface. The ALPS data-acquisition system measures the multispectral reflected energy of the laser with 12 photomultiplier tubes, whose outputs are digitized with a charge-integrating A/D (analog/digital) converter. An IBM PC/AT configured with an Intel Inboard 386 and a Kinetic Systems 2926 PC interface with direct memory access card serves as the system controller. Between each pair of laser pulses (50 ms) the software must read the reflected laser signal, the dark current background level, and various items of housekeeping information and these store this data in a RAM disk. The data are displayed for analysis and permanently stored in the AT's hard disk when the aircraft is turning for its next acquisition pass. The ALPS ASYST software is completely menu-driven and controls all data-acquisition, processing, analysis, and database functions.<>

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NASA机载激光偏振计传感器(ALPS)实时数据采集系统

描述了一种基于asyst的实时数据采集系统，用于测量地球表面各种材料的退极化特性。ALPS系统搭载在NASA的P3飞机上，使用脉冲频率为20赫兹的Nd:YAG激光照射地球表面。ALPS数据采集系统使用12个光电倍增管测量激光器的多光谱反射能量，其输出通过电荷积分a /D(模拟/数字)转换器进行数字化。配置了Intel Inboard 386和带直接存储器访问卡的Kinetic Systems 2926 PC接口的IBM PC/AT作为系统控制器。在每对激光脉冲之间(50毫秒)，软件必须读取反射的激光信号、暗电流背景电平和各种管家信息，并将这些数据存储在RAM磁盘中。当飞机转向下一个采集通道时，这些数据将被显示供分析，并永久存储在空中交通管制处的硬盘中。ALPS ASYST软件完全由菜单驱动，控制所有数据采集、处理、分析和数据库功能

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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6th IEEE Conference Record., Instrumentation and Measurement Technology Conference

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