High-precision optically pumped magnetometer frequency measurement device and method based on GPS (global positioning system) time receiving

Abstract

The invention relates to a high-precision optically pumped magnetometer frequency measurement device and method based on GPS (global positioning system) time receiving. The device comprises a GPS receiver, an FPGA (field programmable gate array) board, a frequency calculation module, a crystal oscillator correction module, a multiplexer and a constant temperature crystal oscillator, wherein the GPS receiver is used for providing GPS pulse-per-second signals, the GPS receiver, the FPGA board, the frequency calculation module and the crystal oscillator correction module are sequentially connected, the multiplexer is connected with the FPGA board, and the constant temperature crystal oscillator is connected with the multiplexer and the crystal oscillator correction module and used for providing clock pulse signals. Measuring site limitation caused by GPS time receiving can be removed, and frequency measurement precision is conveniently improved by a multi-channel cooperative counting method. Besides, the high-precision frequency measurement device constructed by the method is simple to implement, strong in adaptability, high in flexibility, good in electromagnetic compatibility and quite suitable for sensors such as an optically pumped magnetometer with frequency output testing results.

Description

technical field [0001] The invention relates to a high-precision frequency counting technology, in particular to a high-precision optical pump magnetometer frequency counting device and method based on GPS timing. Background technique [0002] High-precision frequency measurement has always been a hot topic of research by experts in related fields in various countries in the fields of metrology calibration, signal recognition, and signal measurement. For some sensors whose measurement results are given by frequency information, the high-precision frequency measurement method is the It is very important, such as the optically pumped magnetometer, which is widely used in the field of magnetic measurement. [0003] The optically pumped magnetometer is based on the Zeeman effect of atoms under the action of a magnetic field, and combines optical pumping and magnetic resonance technology to accurately measure the magnetic field strength. It has the characteristics of high precisi...

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Problems solved by technology

[0007] However, although the above method can realize frequency measurement through GPS timing, it is easily limited by the measurement location in actual use, and its measurement accuracy is not ideal. The reasons are as follows: First, this measurement method is used in places where GPS signals cannot be received Or it will not work normally when the GPS signal is lost occasionally, and the output rate of the frequency meter designed by this method is affected by the maximum output rate of the second pulse in the GPS receiver, which will greatly limit its scope of use; Architecture and performance impact, using a single-source reference sampling clock cannot meet the measurement requirements of high-precision optical pumps, that is, the measurement resolution of its frequency counter is lower than that of optical pumps

[0008] To sum up, the existing high-precision frequency measurement methods cannot meet the measurement accuracy requirements of the measured signal in the field of magnetic measurement, especially the measurement information readout of the optical pump magnetometer, and the installation and use locations are also easily limited. It has greatly influenced the wide application and promotion of superconducting magnetic sensors in the fields of industry, scientific research and medical treatment

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