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- W2741506037 abstract "Abstract A 6-MHz 16-bit waveform digitizer was evaluated for use in atmo-spheric differential absorption lidar (DIAL) measurements of ozone.The digitizer noise characteristics were evaluated, and actual ozoneDIAL atmospheric returns were digitized. This digitizer could replacecomputer-automated measurement and control (CAMAC)-based com-mercial digitizers and improve voltage accuracy. Introduction The waveform digitizer is a critical component of lidar detection systems; it transforms the analogdetector output into a digital signal by measuring the signal voltage in a discrete time interval deter-mined by an external clock. The accuracy of the digital voltage level increases with the digitizer bitlevel. Technology has advanced to the point where 8- and 12-bit waveform digitizers are commerciallyavailable and commonly used in computer-automated measurement and control (CAMAC) crates,which are readily interfaced to computer systems. These systems have worked well for ground andaircraft-borne lidar systems, but future lidar systems will require higher voltage accuracy and eventualdeployment on unpiloted atmospheric vehicles (UAV) and orbiting spacecraft. In these situations, pay-load weight, volume, and available power are severely restricted. Langley Research Center is activelypursuing the development of small, lightweight differential absorption lidar (DIAL) receiver systemsfor deployment on UAV aircraft and eventually on spacecraft. In this situation, CAMAC crates cannotbe used, and the need for higher accuracy has led to the investigation of advanced digitizer technologies.Waveform digitizers have rapidly advanced to the point where small, 16-bit lightweight, low-powerconsumption digitizer modules are available. The advantage of 16-bit digitizers is shown in figure 1, inwhich the performance of 8-, 12-, and 16-bit digitizers is compared. The 16-bit resolution of 0.046 mV/step (assuming a Vma x of 3.0 V) is important, especially for space deployment, where lidar returns will>.sVma x 256 steps 4 096 steps 65 536 steps" @default.
- W2741506037 created "2017-08-08" @default.
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- W2741506037 date "2000-01-01" @default.
- W2741506037 modified "2023-09-24" @default.
- W2741506037 title "Characterization of a 16-Bit Lidar Data Acquisition" @default.
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