High Sensitivity Optical Magnetometer

高灵敏度光学磁力计

• 批准号: 9360417
• 负责人: Andrew Lintz
• 金额: $ 6.33万
• 依托单位: OPTRA Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-15 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9360417&HistoricalAwards=false
• 关键词: Sensitivity; Optical; Magnetometer

9360417 Lintz OPTRA will develop an innovative magnetic field sensing technique that achieves very high sensitivity for earth surveying applications, but unlike all competing SQUID technologies, does not require any cooling. The new magtometer uses newly developed optical materials and OPTRA's proprietary interferometric phase measurement technique. The system consists of a small sensor head (2 inch cube) containing only passive, non conductive optical materials and an optical/electronic processing unit connected together via optical fiber. The sensor head can be implemented as a first or second order gradient sensor; however, the extraordinary linearity and dynamic range of the technique allows high resolution operation within the earth's DC magnetic field (field biasing is not required). The operating principle is the accurate measurement of the Faraday rotation of an optical beam in an advanced, high Verdet coefficient, optical crystal. OPTRA has demonstrated the measurement concept with a 10 mm long by 1.5 mm diameter transducer element and achieved 0.5 nT/ Hz minimum detectable field. Further development during the proposed program will develop a three axis sensor and improve the performance to the 10 14 T/Hz range, comparable to SQUID sensors. The sensor bandwidth is from DC to 50 kHz or more.

小行星9360417 OPTRA将开发一种创新的磁场传感技术，该技术在地球测量应用中具有非常高的灵敏度，但与所有竞争的SQUID技术不同，它不需要任何冷却。 新的磁力计使用新开发的光学材料和OPTRA专有的干涉相位测量技术。 该系统由一个小的传感器头（2英寸立方体），只包含被动，非导电的光学材料和光学/电子处理单元通过光纤连接在一起。 传感器头可以实现为一阶或二阶梯度传感器;然而，该技术的非凡的线性度和动态范围允许在地球的DC磁场内进行高分辨率操作（不需要场偏置）。 其工作原理是精确测量先进的高费尔德系数光学晶体中光束的法拉第旋转。 OPTRA已经证明了使用10 mm长× 1.5 mm直径换能器元件的测量概念，并实现了0.5 nT/ Hz的最小可检测场。 在拟议的计划的进一步发展将开发一个三轴传感器，并提高性能到10 - 14 T/Hz范围内，与SQUID传感器。 传感器带宽从DC到50 kHz或更高。