Michell Instruments Limited

Andrew M V Stokes

David Austin

Michael Summers

Hideaki Page

There is provided a frequency analysis system, comprising: an analog to digital converter having a sampling frequency f; a first band pass filter and a second band pass filter, the first band pass filter and the second band pass filter being arranged in parallel with one another; and a feedback loop from an output to an input of the system, wherein the system has an initial center frequency equal to a nominal frequency f, and a revised center frequency dependent upon the output of the system that is fed back into the input of the system, wherein the transfer functions of the first and second band pass filters have the same poles, and wherein the system is configured such that, when the center frequency fequals the frequency of the signal f, the output of the first band pass filter is in phase with the input, the output of the second band pass filter lags the output of the first band pass filter at a constant phase of and the two band pass titers have equal gain amplitude. There is also provided a method for analyzing the frequency fof a signal and a phase measurement system based on the frequency analysis system.

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Cambridgeshire, United Kingdom

Andrew M V Stokes