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单次瞬态过程频谱分析仪

忻贤杰

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单次瞬态过程频谱分析仪

忻贤杰

A FREQUENCY SPECTRUM ANALYZER FOR SINGLE TRANSIENT PROCESSES

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  • 本文叙述了一个适用于各种单次瞬态过程的频谱分析仪的工作原理和实验结果。本仪器利用实验室现有设备(通用示波器和声频频谱仪等),经过适当组装和附加少量专用电路,可以较快地建成。利用时间扩展(或压缩)技术,可以将欲测的频谱波段移到声频波段。用光电函数发生器产生待测的瞬态过程的重复波形。这样,就可以用一般的声频频谱仪(或波分析仪)来模拟测量单次瞬态过程的频谱。实验结果证明上述方案是可行的。对主要频谱成份,测量可准确到2—3%。对较弱的频谱成份,准确度要差些。
    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.
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出版历程
  • 收稿日期:  1975-06-12
  • 刊出日期:  2005-08-01

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