Open AccessA FREQUENCY SPECTRUM ANALYZER FOR SINGLE TRANSIENT PROCESSES
Author(s) -
Xin Xian-Jie
Publication year - 1977
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.26.22
Subject(s) - spectrum analyzer , waveform , transient (computer programming) , signal analyzer , frequency spectrum , measure (data warehouse) , electronic circuit , spectrum (functional analysis) , computer science , acoustics , physics , optics , telecommunications , quantum mechanics , operating system , radar , database
The principles and experimental results of a frequency spectrum analyzer for all types of single transient processes are described in this paper. By the suitable combination of existing laboratory instruments and a few special circuits which are described here, the analyzer may be assembled fairly quickly. By using time expansion (or compression) techniques, the frequency spectrum of interest may be trans-fered to any frequency band. The single transient is reproduced as a repetitive waveform by means of a photoformer. In this way it is possible to use an ordinary low frequency spectrum analyzer to measure the frequency spectrum of single transient processes of any type or duration. Experimental results prove that the above method is applicable. For the principal compositions of the spectrum, measurements may attain an accuracy of 2-3%. The accuracy for minor compositions of the spectrum is somewhat less.