Description of a Data Acquisition System for the Measurements of EMP Transient Fields.

摘要

This technical note describes a data acquisition system developed at DREO for the measurements of very fast transient electromagnetic fields generated during EMP testing. The system consists of several high speed transient digitizers, all connected to a personal computer. It has the capability to simultaneously record on several channels the response of single-shot events. The overall system is controlled by a master program called DAQ. DAQ can control a number of digitizers simultaneously, allowing automation of part of the measurement process. The data transferred to the PC is automatically bound with related information such as: experiment description, setup information (sensor, cable, attenuator, and instrument used), digitizer parameters, and data processing. DAQ can archive and retrieve the results of a large number of experiments. DAQ can produce plots of the results on the screen or on hardcopy, and also has the capability to import the plots into popular word processors for the preparation of reports. DAQ incorporates several digital signal processing routines, which may be used to process the raw data. Various implementations of Finite Impulse Response (FIR) and Infinite Impulse Response (IIR) filters are supported, as well as some of the classical approaches such as Butterworth low-pass and hi-pass filters. ASYST Programming language, Data acquisition, Digital signal processing, EMP Measurements, IEEE-488 (GPIR) Instrumentation bus, Textronik 7912 Digitizers, Textronik SCD1000 Digitizers, Textronik DSA602 Digitizers, Transient fields measurements.