Transmission of pulses

Signals in most if not all positron experiments are transmitted along coaxial cables in the form of current pulses—i.e., a charge dq in time dr, where dr is in the range lO -lO3 ns. The pulses are used for counting, to locate events, to measure energy, as time markers, and so on. 

Coaxial cables are commonly used as low-distortion, low-jitter delay lines in timing circuits. The velocity of a current pulse along an ideal cable (Ro, G0 = 0) is given by c = (L0C0) I/2 2xl08 ms 1. Hence a pulse takes almost exactly 5ns to travel along lm of cable-a handy figure to remember. 

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The ground probing radar method is based upon the transmission of pulsed electromagnetic waves in the frequency range 1 to 1000 MHz. In this method, the travel times of the waves reflected from subsurface interfaces are recorded as they arrive at the surface, and the depth, Z, to an interface is derived from ... 

Fiber with thick 3-20 Fast transmission of pulses 20... 

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