基于半导体激光器的氦光泵磁力仪的关键技术研究

项目名称： 基于半导体激光器的氦光泵磁力仪的关键技术研究

项目编号： No.41304140

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 周志坚

作者单位： 吉林大学

项目金额： 25万元

中文摘要： 氦光泵磁力仪的磁异常探测在地质调查、矿产普查、海洋磁测、潜艇的跟踪与探测、导弹和飞机的导航以及空间探测等领域有着广泛的应用。氦光泵磁力仪始终在向更宽应用范围，更高灵敏度及更低噪声水平方向发展，同时配合适当磁补偿，还可适用于矢量测量。本课题利用半导体激光器代替原来的气体放电灯 ，通过发挥激光谱线单一，输出光功率强等优点，配合数字化检测电路实现基于半导体激光器的氦光泵磁力仪。主要研究内容有：配合半导体激光器输出光束的激励功率可调的吸收室点亮技术；理论计算与实验验证两方面对比线偏振光与圆偏振光的不同效果；半导体激光器的波长稳定技术；分析并抑制由激光器和电路产生的各种噪声，提高激光氦光泵磁力仪的性能指标。本课题的研究目标是：磁力仪工作范围 25000nT-100000nT，灵敏度0.001nT/ √Hz。研究成果可应用于航空磁测和军事磁异常探测等领域，也可应用于卫星上所用的磁测设备。

中文关键词： 光泵磁力仪；半导体激光器；吸收室；共振吸收曲线；PID控制系统

英文摘要： The fields of geological survey, mineral prospecting, marine geomagnetic survey, the track and detection of submarine and space exploration take the anomaly magnetic detection, Helium Optical Pumping Magnetometer as one of its important tools. Helium Optical Pumping Magnetometer is always developing with the target of wider fields of application, higher sensitivity and lower noise level. Meanwhile, Helium Optical Pumping Magnetometer is also applied to vector measurement with proper magnetic compensation. The project task uses semiconductor laser replace of gaseous discharge lamp, Helium Optical Pumping Magnetometer based on semiconductor laser can be accomplished by taking the advantages of single spectrum line and intense output optical power of laser and combining digitalize detection circuit. This project task mainly research the technology of illuming cell that the incentive power is tunable in order to coordinate semiconductor laser to output beam, it provides a comparison for the different effects of linearly polarized light and circularly polarized light by theoretical arithmetic and experimental verification, it research wavelength stabilization technology of semiconductor laser. It also analyse and restrain every kinds of noises generated by laser and circuit in order to improve the performance of the

英文关键词： Optically Pumped Magnetometer；semiconductor laser；abosorption cell；resonance curves；PID control system