NUCLEAR MAGNETIC RESONANCE DEVICE AND LIQUID CONSTITUENT INSPECTION DEVICE USING THE DEVICE

• Main Authors: SUETAKE HIDEKI, ITO YASUSHI, MATSUMURA NORIAKI
• Format: Patent
• Language: English
• Published: 29.08.2000
• Edition: 7
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide an NMR device capable of limiting a temperature change in a constant- temperature chamber so that a change in a magnetic field can be kept at a minimum value of about 10-4% or less and provide a device for inspecting food with high accuracy and with high efficiency by automating the inspection of food using an NMR in a food inspecting system utilizing the NMR. SOLUTION: In this nuclear magnetic resonance device (NMR device), heat exchangers 59, 60, 61 are disposed close to permanent magnets 56 in a constant-temperature chamber in which the permanent magnets 56 and an electromagnetic coil 51 are disposed while a constant-temperature liquid producing device 62 is provided for producing a constant- temperature liquid controlled to a constant temperature, and the constant-temperature liquid producing device 62 is connected to the heat exchangers 59, 60, 61 by piping to circulate the constant-temperature liquid between the two, thereby keeping the interior of the constant- temperature chamber at a constant temperature. In a food inspecting device for measuring constituents of a sample liquid by the NMR device 100, a signal detected by magnetic resonance and sent from the NMR device 100 is converted into a frequency spectrum, a peak frequency thereof is detected, a current correcting value that makes the peak frequency equal to a reference frequency is found, and a correcting magnetic field is set up by the current correcting value for correcting the magnetic-field intensity of the magnets, thereby limiting a change in the magnetic-field intensity.