摘要
设计了一种用于非屏蔽SERF态原子磁强计的电流源。利用运算放大器和MOSFET构建基本的电流负反馈V/I转换电路,采用高性能元器件降低输出电流纹波,并通过频率补偿的方法使电路稳定。测试结果表明:在恒负载的条件下,电流源的输出范围为0～500mA,纹波电流小于30.5μA,对应磁场的稳定性优于10 nT,满足非屏蔽情况下原子磁强计利用磁补偿制备SERF态的要求。
A current source is proposed for unshielded atomic magnetometer based on spin-exchange relaxation free（SERF） regime. It uses operational amplifier and MOSFET to construct basic V/I change-over circuit, and high-performance components is used to reduce the ripple of output current, then stablizes the circuit by frequency compensation method. The test results show that the current source output range 0 ~500 mA, and the ripple current is less than 30.5 μA when the load is invariable,the stability of corresponding magnetic field is prior to 10 nT, which meets the requirements of SERF regime atomic magnetometer for unshielded applications.
出处
《传感器与微系统》
CSCD
北大核心
2012年第12期83-86,共4页
Transducer and Microsystem Technologies
基金
国防科研计划资助项目(B2120110002)
国家自然科学基金资助项目(61074171
61121003
60825305)
北京市自然科学基金资助项目(3122025)
国家重大科学研究计划资助项目(2012CB934104)
关键词
电流源
非屏蔽
无自旋交换弛豫态
原子磁强计
current source
unshielded
spin-exchange relaxation free（SERF） regime
atomic magnetometer
