Development and Utilization of a Signal Averaging System

Abstract

<p>A sampling oscilloscope was interfaced to a PDP11/10 minicomputer via one analog-to-digital converter (ADC) and one digital-to-analog converter (DAC), with the minicomputer being interfaced to a real time oscilloscope or plotter via two more DAC's. A software program that employed both assembler and Fortran was developed. This program controlled the signal averaging, did some data analysis, could output the data in normalized form onto a real time scope or a plotter, and also input and output the signal using punched type.</p> <p>The usefulness of the system was then demonstrated by measuring the rise time of a short laser pulse through various lengths of graded index fibre, and the fibre response was extracted as a function of fibre length.</p>