[15p-P1-1~9] 1.5 Instrumentation, measurement and Metrology

△ [15p-P1-7] Development of a Portable Spectrometer for Nuclear Quadrupole Resonance

〇Yui Otagaki¹, Ryutaro Ohira¹, Yuji Miyato¹, Hideo Akaba¹ (1.Osaka Univ.)

Keywords:Nuclear Quadrupole Resonance

Nuclear Quadrupole Resonance (NQR) is one of magnetic resonance phenomena, which is caused by the irradiation of external AC magnetic field at a particular resonance frequency against a target substance containing nuclei with the spin larger than 1. It allows the remote inspection of the target substance by detecting the magnetic resonance signal from the excited substance during its relaxation. The size of the substance inspection system based on commercially available NQR spectrometer is generally too big to bring. If the size can be reduced enough to bring it, its applicable field will be extended to the outdoor use. In this study, the portable NQR system with the FPGA based controller was newly developed for the substance inspection. Our system was equipped with a D-class amplifier controlled by the FPGA. The NQR signal was successfully detected by our new system from RDX, which is one of the landmine explosives containing 14N nuclei. The S/N ratio of the NQR signal detected by our system was almost equal to or a bit bigger than that of the commercially available spectrometer system but, nevertheless, the size was much smaller.