Abstract: To meet the requirement of NQR measurement of ¹⁴N compounds outside the probe-head, an NQR speetrometer with simplicity and economy was built. It utilizes the pulsed Fourier transform technique to apouire FID or echo signais for coherent accumulations. The whole system consists of two parts. The first part, hardware component, is made up of a radio-frcquency pulse gcnerator with power output of about 500 W, a probe-head, a receiver, an MCS-96 series single-chip micro-processor (8097BH) and an IBM pcrsonal computcr (PC/386). The second part includes softwam running in the single-chip micro-proessor and programs for the PC to handle numerical time-domain NQR data. With this apbectrometer, NQR signals from typical ¹⁴N samples of tens of grarns and within 10cm distance from the probe can be deteded in tens of seconds.

Key words: ¹⁴N compounds, Nuclear quadrupole rasenance, Remote detoction