To provide a high-sensitivity NMR measurement device, having a high Q-value using a superconductor, and equipped with a probe antenna which will not cause the homogeneity of the static magnetic field in a sample space to deteriorate.
The probe antenna is constituted using a wire, on which a superconductor layer with a thickness of hundreds of nm to several m, is formed on the surface of the metal wire. The probe antenna is wound and fixed to a cylindrical type bobbin of a dielectric material. The probe antenna consists of a LC resonance circuit, and a high-frequency current flows in a conductor of the antenna at signal detection from the sample. At this time, the high-frequency current which flows due to skin effect is concentrated on the surface of the antenna conductor. Thus, the resistance loss of the antenna as a whole is reduced by forming the superconducting thin film of low resistance, and the Q-value is improved. According to this, the resistance loss of the whole antenna is reduced, and the Q-value can be enhanced, by forming the superconducting thin film of low resistance on the surface of the antenna conductor, in which the concentrated high-frequency current flows at signal detection.
SAITO KAZUO
HASEGAWA HARUHIRO
TAKAHASHI MASAYA
OKADA MICHIYA
