JPS5968655A - Detector for nuclear magnetic resonance equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detector for a nuclear magnetic resonance apparatus, and more particularly to a detector for a nuclear magnetic resonance apparatus suitable for detecting nuclear magnetic resonance signals of nuclides contained in a sample tube. .

When performing various measurements using a detector for a nuclear magnetic resonance apparatus, depending on the amount of sample of the nuclide to be measured, it is necessary to switch the nuclide to be measured or to replace the sample tube with a sample tube of a different diameter. However, in recent years, with the use of broadband detectors, even sample tubes with the same diameter can detect 13C131p, "B,"
0.14N%It became possible to measure other multinuclides. However, even when using the above-mentioned detector, when measuring the natural product Kanakura 1H nucleus, reliable measurement could not be performed because the amount of sample was relatively small. Therefore, in order to solve the above problem,
Head conversion methods and insert replacement methods, in which the detection coil section that detects all nuclear magnetic resonance signals is replaced, have been adopted. However, in the case of these methods, the measurer must remove or attach a part of the detector himself in order to replace the detection coil section, which makes the measurement troublesome and reduces the measurement time. It had the disadvantage of being long. Furthermore, due to differences in the characteristics of the replaced detection coils, the magnetic susceptibility differs, resulting in a decrease in the uniformity of the magnetic field, which sometimes makes it impossible to obtain the resolution necessary for measurement. Therefore, each time the detection coils were replaced, the operator had to adjust the operation to improve the uniformity of the magnetic field.

The present invention has been made in view of the above-mentioned conventional problems,
The purpose is to provide a detector for a nuclear magnetic resonance apparatus that allows easy switching of the nuclide to be measured.

In order to achieve the above object, the present invention provides a detector for a nuclear magnetic resonance apparatus that detects a nuclear magnetic resonance signal contained in a sample tube, which includes a sample tube having a plurality of sample storage sections having different inner diameters; It includes a detection coil that is wound around each sample storage section of the sample tube and detects a nuclear magnetic resonance signal, and a moving device that moves the sample tube. It is characterized by switching the supply of magnetic field to the nuclides.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

4t: A block diagram of a preferred embodiment of the present invention is shown in the drawings. In the figure, a sample tube 12 is provided within the detector main body 1°, and a plurality of sample storage portions 14 and 16 having different inner diameters are formed in this sample tube 12. Detection coils 18 and 20 for detecting nuclear magnetic resonance signals are wound around the sample storage sections 14 and 16, respectively. The detection coils 18.20 each detect a nuclear magnetic resonance signal generated when the magnetic field generated from the pole piece 22 is applied to the nuclide stored in the sample storage section 14.16, and send this detection signal to the amplifier 24.26. supply to.

In addition, in the figure, the sample storage section 14 is connected to the pole piece 22.
It is located in a position where a magnetic field is applied through the magnetic field. Therefore, when switching the magnetic field supply from the nuclide in the sample storage part 14 to the nuclide in the sample storage part 16, in this embodiment, by moving the sample storage part 16 to the position of the sample storage part 14, I am planning to do it. A moving device 30 performs this movement, and this moving device 30 consists of a drive source 32 that generates power, and a drive device 34 that moves the bottom of the sample tube 12 up and down using this power.

Therefore, in this embodiment, when the sample tube 12 is moved,
The supply of the magnetic field to the nuclides stored in the sample storage sections 14 and 16 can be switched.

As described above, in this embodiment, it is possible to switch the supply of the magnetic field to the nuclide stored in the sample storage section by moving the sample tube 12, but if this is done, the characteristics of the detection coil 18 and the detection coil 20 will be different. There is a risk that a uniform magnetic field may not be applied to the nuclides stored in the sample storage section. Therefore, in this embodiment, a magnetic field correction coil 36 is provided in the detector main body 10, and correction is made so that a uniform magnetic field is applied to the nuclides in each sampling storage section 14.16 according to the characteristics of the detection coil 18.20. I decided to. That is, this magnetic field correction coil 36 is connected to a correction circuit 40 via a switch 38. This correction circuit 40 stores the current value that a uniform magnetic field should give to the nuclide stored in each sample storage section 14.16 in accordance with the characteristics of the detection coil 18.20.

Then, by moving the sample (t・1 tube 12), each sample storage section 1 is
The switch 38 is switched each time a magnetic field is applied to the nuclide stored in the detection coil 18.20, and a current value corresponding to the detection coil 18.20 is supplied to the magnetic field extraction coil 36. Therefore, even if the supply of the magnetic field to the nuclei and seeds stored in each sample storage section is switched due to the movement of the sample tube 12, each sample storage section 14.
A uniform magnetic field is applied to the nuclides within.

In this way, in this example, there is no need to change the detection coil due to the change of the measurement nuclide or the difference in the inner diameter of the sample tube used for measurement, and the measurement nuclide can be changed in a short time by moving the sample tube. The nuclide to be measured can be switched. Furthermore, even if the magnetic susceptibility of the detection coil differs due to the difference in the inner diameter of the sea lion tube, a uniform magnetic field is applied to the nuclide to be measured, so measurement errors can be prevented and accurate measurements can be performed.

As explained above, according to the present invention, the detection coil can be switched easily and in a short time.
This has the excellent effect of allowing measurement work to be carried out efficiently.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of the present invention.

Claims (1)

[Claims] 1. In a nuclear magnetic resonance device d-phase detector that detects nuclear magnetic resonance signals stored in a sample tube, there is provided a sample tube having a plurality of sample storage portions having different inner diameters, and the sample tube. a detection coil that is wound around each sample storage section and detects a nuclear magnetic resonance signal, and a moving device σ that moves the sample tube, and by moving the sample tube, the nuclide stored in each sample storage section is detected. A detector for a nuclear magnetic resonance apparatus characterized by switching the supply of a magnetic field to. 2. Claim 1 comprising a correction circuit that uniformly corrects the magnetism applied to the nuclides according to the characteristics of various detection coils each time a magnetic field is applied to the nuclides stored in each sample storage section.
A detector for a nuclear magnetic resonance apparatus as described in .