摘要
为提高传统质子磁力仪综合性能,同时为研制Overhauser磁力仪提供参考依据,设计了基于数字信号处理器(DSP:Digital Signal Processor)TMS320F2812研制的JPM-1型质子磁力仪。该磁力仪以DSP为核心实现质子旋进信号的采集和处理,采用基于DSP的软件过零数频算法计算旋进信号频率。分析了探头初始信号强度,并通过建立仪器噪声模型分析了仪器噪声。野外测试结果表明,该磁力仪探头信号初始幅度约为0.4μV,初始信噪比为32∶1,灵敏度为0.27 nT。
In order to improve the traditional proton magnetometer comprehensive performance,and provide reference basis for developing Overhauser magnetometer,JPM-1 proton magnetometer is introduced,which is based on DSP（Digital Signal Processor） TMS320F2812 and is different from previous domestic magnetometer.DSP is used to acquire and process the precession signal,and the frequency counting method based on zerocrossing counting algorithm is employed.Initial signal strength and the noise characteristics are discussed,and the measured results fit well with the calculated results.Final results show that the initial signal strength is about 0.4 μV with SNR（Signal to Noise Ratio） 32：1,and 0.27 nT sensitivity is obtained in field measurement.
出处
《吉林大学学报（信息科学版）》
CAS
2014年第5期509-515,共7页
Journal of Jilin University（Information Science Edition）
基金
吉林省产业技术研究与开发专项基金资助项目(2013C035-1)
关键词
质子磁力仪
数字信号处理器
信噪比
数频算法
灵敏度
proton magnetometer
digital signal processor（DSP）
signal to noise radio （SNR）
frequency counting algorithm
sensitivity
