By M. A. Perry
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Extra info for Aerospace Instrumentation. Proceedings of the Fourth International Aerospace Symposium
L A W S O N A N D A . M. O. iher 100,010 cps L«»|Pre-amplifier[-^ Modulator [--| •|pre-amplifief Í|Modulator Frequency to voltage convertor Filter - * | Averager — Smoothei X-Y recorder Filter [*-"Äveroqer [^Smoother Divider "Ρ FIG. 17. Swept sine analysis of accelerometer test system. Note the offset drive and analysis frequencies. WHITE NOISE GENERATOR! LOW PASS FILTER BANDWIDTH Ε TRANSFER FUNCTION TO TRANSFER FUNCTION ANALYSER DRIVEN FROM THE LOCAL OSCILLATOR LOCAL OSCILLATOR SWEPT NARROW BAND SPECTRUM Frequenqr — » FIG.
LOW PASS FILTER BANDWIDTH Ε TRANSFER FUNCTION TO TRANSFER FUNCTION ANALYSER DRIVEN FROM THE LOCAL OSCILLATOR LOCAL OSCILLATOR SWEPT NARROW BAND SPECTRUM Frequenqr — » FIG. 18. Swept narrow band random system analysis. 55 THE ANALYSIS OF RANDOM SIGNALS the centre of the excitation band. This system allows both a high signal strength per unit bandwidth (hence reducing saturation and signal/noise problems) whilst allowing sufficient time for the system transients to die away before the tracking filter arrives.
This is a circuit which operates on the filter output signal. e. approaches a state of coherence) the filter output is clamped whilst the filter passes through coherence and is then released. Whilst the authors feel that such a procedure is of no analytical value, it saves time in sterile discussions. Where the coherence problem becomes a real one is in filter tracking or system driving and analysis, but these will be discussed later. 2. Broad band random. The basic procedures for establishing the Power Spectral Density of a broad band process are well described in Ref.