03-12-2020 дата публикации
Номер: US20200378910A1
Автор:
Espy Michelle A.,
Janicke Michael Timothy,
Kaseman Derrick C.,
Magnelind Per Erik,
Michalczyk Ryszard,
Nath Pulak,
Paisner Scarlett Widgeon,
Schmidt Jurgen G.,
Urbaitis Algis V.,
WILLIAMS Robert F.,
Yoder Jacob Luther
A nuclear magnetic resonance (NMR) system is configured to detect chemical threat material. The system comprises a magnet configured to generate a magnetic field of about 300 millitesla or less; and a probe configured to detect nuclear relaxation of at least two nuclei selected from the group consisting of H, F, P and N, and detect the spin density of nuclei selected from the group consisting of H, F, P and N, following excitation. 1. A nuclear magnetic resonance (NMR) system configured to detect chemical threat material , comprising:a magnet configured to generate a magnetic field of about 300 millitesla or less; and [{'sup': 1', '19', '31', '14, 'detect nuclear relaxation of at least two nuclei selected from the group consisting of H, F, P and N, and'}, {'sup': 1', '19', '31', '14, 'detect the spin density of nuclei selected from the group consisting of H, F, P and N, following excitation'}], 'a probe configured to2. The NMR system of claim 1 , wherein:the probe defines a hollow space capable of receiving a sample; andthe probe comprises an electrical shield configured to reduce electrical field inside the hollow space.3. The NMR system of claim 2 , wherein the probe further comprises a detection coil for detecting the nuclear relaxations.4. The NMR system of claim 3 , wherein the electrical shield is configured to reduce an electrical field generated by the detection coil.5. The NMR system of claim 2 , wherein the probe comprises:{'sup': 1', '19', '31', '14, 'a first coil configured to detect relaxations of at least two nuclei selected from the group consisting of H, F, P and N; and'}a second coil configure to detect relaxations of a nucleus selected from the group.6. The NMR system of claim 5 , wherein the at least two nuclei are H-1 and F-19.7. The NMR system of claim 5 , wherein the first coil does not require retuning between the detections of the at least two nuclei.8. The NMR system of wherein the chemical threat materials are selected from the group ...
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