Temperature measuring method and device based on nuclear magnetic resonance principle
A technology of temperature measurement and nuclear magnetic resonance, which is applied in measuring devices, measuring heat, and thermometers using directly heat-sensitive electric/magnetic elements, etc., can solve problems such as inapplicable temperature measurement, and achieve high-precision results
Active Publication Date: 2013-06-12
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
Although the superconducting quantum interferometer has high sensitivity, it is only suitable for the measurement of weak magnetic fields and is seriously affected by the environmental magnetic field, so it is not suitable for the temperature measurement of this method
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0029] figure 1 Shown is the structure diagram of the temperature measuring device of the present invention. Among them, the magnet structure such as figure 2 shown. The magnet is composed of magnetic material and yoke iron, or is composed of magnetic materials with different magnetization directions arranged in a certain way, forming a uniform static magnetic field in the air gap. On the pole plate 201, or around the circumference of the inner cavity of the halbach magnet, a magnetic field uniform device 102 is arranged.
[0030] A radio frequency coil 103 is installed in the air gap of the magnet, wherein a signal source 104 is placed in the radio frequency coil 103, and the signal source 104 is filled with substances containing 1H nuclei such as water or fat. The radio frequency coil 103 is connected to the radio frequency power amplifi...
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Abstract
The invention discloses a temperature measuring method and a temperature measuring device based on a nuclear magnetic resonance principle. The measuring method comprises the steps of: placing a radio frequency coil internally provided with a signal source in a permanent magnet, emitting power pulses to the radio frequency coil through a pulse generator and a radio frequency power amplifier, radiating radio frequency pulses through the excited signal source, receiving through the radio frequency coil, and processing through a signal amplifying and collecting processing circuit to obtain the signal frequency. The frequency of a magnetic resonance signal is in direct proportion to the magnetic field strength, so that the magnetic field strength can be obtained by measuring the frequency of the magnetic resonance signal. The magnetic field strength of the permanent magnet changes with the temperature, so that a micro temperature change can cause frequency change of the magnetic resonance signal, and the temperature change can be detected by the frequency change. The frequency of the magnetic resonance signal is sensitive to the magnetic field change, so that the method and the device disclosed by the invention can obtain very high temperature resolution. The method and the device are suitable for occasions with high temperature measurement sensitivity demands.
Description
technical field [0001] The invention relates to a temperature measuring method and a device using the temperature measuring method. Background technique [0002] Temperature measurement is one of the most important functions in the field of measurement. With the development of science and technology and the needs of modern industrial technology, temperature measurement technology is constantly improving and improving. At present, the traditional temperature measurement methods include the following: thermal radiation temperature measurement, resistance temperature measurement, thermocouple temperature measurement, temperature measurement based on the principle of thermal expansion and cold contraction, etc. The existing temperature measurement technology has the problem of low sensitivity. Taking the commonly used platinum resistance temperature sensor as an example, at 273K, the temperature coefficient of platinum resistance per ohm is about 0.00392Ω·K -1 . A platinum res...
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IPC IPC(8): G01K7/38
Inventor 杨文晖王铮张玉霞
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI