Highly Sensitive Measurement of Moisture Content Using HTS-SQUID
| Autor: | H. Tahara, Hironobu Yamada, Akira Tsukamoto, Keiji Tsukada, Akihiko Kandori, E. Miyake, Toshihiko Kiwa |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
business.industry Amplifier Lock-in amplifier Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetic field SQUID Nuclear magnetic resonance law Electromagnetic coil Condensed Matter::Superconductivity Electromagnetic shielding Shielded cable Optoelectronics Diamagnetism Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 19:878-881 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | We developed a highly sensitive magnetic system for measuring moisture content using an HTS-SQUID sensor. The system consists mainly of an exposure coil, a Dewar flask containing HTS-SQUID immersed in liquid nitrogen, a cancellation coil, a lock-in amplifier, magnetically shielded box, and FLL circuit. The cancellation coil was used to eliminate the applied magnetic field at the sensor position, and then a cancellation ratio of more than -40 dB was obtained. By the high performance, the subject can be exposed to a powerful magnetic field strength in the order of muT, and a weak magnetic signal of less than tens of pT from the subject can be detected. Using a magnetic vector analysis technique, more precise measurement of moisture content is realized. |
| Databáze: | OpenAIRE |
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