科研之友
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摘要
Earth's field nuclear magnetic resonance (NMR) can be used for non-destructive in-bottle liquid screening by evaluating the spin-lattice relaxation times of protons in various liquids. An Earth's field NMR apparatus has been developed and optimized to measure the spin-lattice relaxation times of various liquids contained in 500 ml PET bottles. Two methods to generate 90-degree readout pulses using transient oscillating signals generated in a resonator are reported. The lower detection limit of pure water was 1 ml. The minimum measurable spin-lattice relaxation time was 50 ms.
- 出版日期2012-12
