Study on Digital Demodulation Technology of All-Optical Cesium Optically Pumped Magnetometer

Abstract

With the development of science and technology, the digital drive signal generated by the CNC oscillator is turned into an analogue signal to drive the magnetic sensor through a digital to analogue converter, and the output signal from the CNC oscillator to a digital phase amplifier. This process allows the digital demodulation technique to be deeply optimised. Caesium light pump magnetometer is a high precision, high sensitivity weak magnetic field measurement instrument based on the Saiman effect of Caesium atoms in a magnetic field, then combined with light pumping action and magnetic resonance technology. Currently, the digitalisation of the signal detection system of the domestic cesium light pump magnetometer is low and there is a considerable gap with foreign products. This paper discusses the application of the model in the digital demodulation of the all-optical cesium light pump magnetometer based on the all-optical cesium light cluster demodulation technology. The output of the CNC oscillator, the amplitude-frequency response of the low-pass filter circuit and the frequency accuracy of the driving signal in the digital signal generator are tested experimentally, and the waveforms of the collected signals in the digital lock-in amplifier and the accuracy of the phase measurement and amplitude measurement are tested for the readers' reference.