A METHOD FOR AUTOMATED LOCKING OF THE RESONANT-FREQUENCY OF A CAVITY

A method was developed and the corresponding instrumentation designed for an automated generator that tunes to one of the resonance frequenc ies of a cavity. The method is based on the analysis of spectral compo nents of the envelope of a frequency-modulated signal passed through t he cavity. The system implements any commercial signal generator with electronic tuning of the output frequency. The relative error of the e igenfrequency determination in the S-band (10-cm) is +/-1.2 x 10(-7), which satisfies the requirements fot high-precision investigations of the electromagnetic field distribution in cavities by the beard-pull p robing method.