SFERIC_SIMULATOR_CIRCUIT

Published:2009/7/15 0:14:00 Author:Jessie | From:SeekIC

This circuit generates a signal that simulates the waveform of a sferic-the very-low-frequency electromagnetic signals generated by a lightning strike. This circuit is designed to test and calibrate lightning-detecting instruments. Typically, lightning-detecting instruments have been calibrated and tested using single-frequency signals or broadband noise sources, which do not have the spectral characteristics of sferics. This circuit generates a bipolar pulse waveform that closely approximates the main features of sferics. The circuit contains few components. This circuit assembly is light in weight and compact; even a breadboard version could fit in a 1.5-inch square (about 3.8 cm). To ensure that the output waveform has the desired shape, the trigger pulse fed to the input terminal of this circuit must be a square wave with rise and fall times less than 100 ns. To prevent coalescence of sequential output pulses, the square-wave pulse-repetition frequency should be kept at or below 3000 Hz.



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