Higher voltage maximizes penetration, while lower voltages improve near surface resolution and conserve battery life. Pulse energy or voltage: The amplitude of both spike and square wave pulses may be adjusted for optimum response over typical ranges from 100v to 400v or greater. (Spike pulses are broadbanded and do not need to be tuned.) Pulse width or frequency: As noted above, a square wave pulse must be tuned to the frequency of the transducer. Square wave pulsers generally offer greater energy output from a given transducer and are now commonly available. A square wave pulser generates a single cycle square wave that is tuned to the center frequency of the transducer. A spike pulser generates a broadband pulse with a very fast rise time and an exponential recovery. Pulse Type: Two types of excitation pulses are commonly used in portable flaw detectors. ![]()
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