Pulse Repetition Interval (PRI) is the time between sequential pulses. If the light goes on for 2 seconds and off for 2 seconds continuously the period would be 4 seconds. The pulse length is usually called Pulse Width in radar systems. distance. Peak Power. The peak power of a Gaussian pulse is ≈ 0.94 times the pulse energy divided by the FWHM pulse duration.. The pulse length is usually called the PULSE WIDTH in radar systems. These terms are often confused or used interchangeably, when they are actually three different ways of measuring an electrical signal. These listening times represent one pulsed radar cycle time, normally called the interpulse period or (IPP) or pulse repetition interval (PRI). Compared with a sech 2-shaped pulse, a Gaussian pulse with the same width at half-maximum has somewhat weaker wings:. •Wide pulse duration, high intensity •Treatment goals: – Retard muscle atrophy ... • Also referred to as pulse width • Measured in microseconds (usec) • Longer phase durations increase the depth of penetration • Longer phase durations recruit more motor units The pulse duration is called the “pulse length”, and is measured in micro-seconds. If the light goes on for 2 seconds the pulse duration would be 2 seconds. Pulse Width (PW) is the elapsed time between the rising and falling edges of a single pulse. Figure 1: Temporal shapes of Gaussian and sech 2 pulses. Pulsed Mode: Laser radiation that is emitted intermittently as short bursts or pulses of energy rather than in a continuous fashion. Pulse duration: Time it takes for one pulse to occur = period times the number of cycles in the pulse. Pulsed Wave Pulse duration decreases if number of cycles in a pulse is decreased or if frequency is increased. Contrast with ‘Continuous Mode’. Pulse Duration: A measurement of the total amount of time that a pulse is emitted; also known as pulse width. The pulse duration is called the "pulse length", and is measured in micro-seconds (one micro-second is one-millionth of a second). Except high pulse duration, the median of low pulse count, low pulse duration, and high pulse count in the postimpact period were lower than those in the preimpact period ( Table 10.4 ). Low pulse count, low pulse duration, high pulse count and high pulse duration have been changed, with HA of − 64%, − 69%, − 64%, and − 20%, respectively. Laser … Peak Power = Pulse energy/ Pulse duration . Usually 2-4 sec ramp up and 1-2 sec ramp down Pulse Width: See Pulse Duration. Expressed in ms. Sonographic pulses ~ 2-3 cycles long, Doppler pulses ~ 5-20 cycles long. Pulse Duration (ms) or Pulse Width. PULSE WIDTH 300-400 S may be best Duty cycle relates to fatigue If less fatigue resistant 1:8 - 1:5 Once less likely to fatigue drop to 1:3 - 1:2 - 1:1 Ramp - no definitive rules, BUT with stronger stimulation use longer ramp. The figure above shows the power versus time for a Gaussian-shaped pulse with 50-kW peak power and a FWHM duration of 3 ps. Imagine a light going on and off. Peak power refers to the power level during an individual laser pulse. The Gaussian pulse shape is typical for pulses from actively mode-locked lasers; it … The relationship between pulse rate (PR) and pulse width (PW) for a constant level of electrocutaneous stimulation was ascertained using the method of comparative judgments. Short laser pulses, as generated for example with Q-switched lasers, often have durations in the regime of nanoseconds, while ultrashort pulses from modelocked lasers last only for picoseconds or femtoseconds.. 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