Automatic frequency controller

Abstract

The invention provides an automatic frequency controller which comprises a frequency setting module and a frequency correcting module, wherein the frequency setting module is used for setting the frequency of a first wave source signal, and the frequency correcting module is used for correcting the frequency to the chamber resonant frequency. In this way, frequency setting and frequency correction functions are separated from each other. Under frequency separation conditions, the frequency setting module and the frequency correcting module can select sensitivity freely. Since the amplitude of signals generated in a signal generation module is low when the sensitivity of the frequency correcting module is high, the signal-to-noise ratio of the first wave source signal output by the automatic frequency controller is low. The frequency correcting module in the automatic frequency controller can select a device with low sensitivity to increase the amplitude of signals generated in the signal generation module. The signal-to-noise ratio of the first wave source signal output by the automatic frequency controller is thus increased. When the signal-to-noise ratio of the first wave source signal output is increased, the signal-to-noise ratio and sensitivity of corresponding electron paramagnetic resonance spectrometer are increased.

Description

technical field [0001] The invention belongs to the technical field of automatic frequency control, and more specifically relates to an automatic frequency control device. Background technique [0002] Automatic frequency control is an automatic correction technology that automatically adjusts the microwave carrier frequency to the target frequency to achieve automatic frequency tracking. At present, with the rapid development of electronics, communication and related research fields, automatic frequency control has been widely used in many fields, such as electron paramagnetic resonance spectrometer. [0003] In the electron paramagnetic resonance spectrometer, due to the interaction between the resonant cavity and the test sample, when the resonance phenomenon occurs between the resonant cavity and the test sample, the cavity resonant frequency of the resonant cavity changes, and the cavity resonant frequency will also be affected by factors such as external temperature an...

AI Technical Summary

Problems solved by technology

However, the way the frequency setting control signal and the AFC feedback signal work together on the frequency modulation port of the VCO reduces the signal-to-noise ratio and sensitivity of the electron paramagnetic resonance spectrometer.

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