Variable temperature probe for nuclear magnetic resonance detection

Abstract

The invention discloses a variable temperature probe for nuclear magnetic resonance detection. The variable temperature probe comprises a probe main body, a liquid nitrogen spraying cooling device, atemperature sensor, a heating device and a temperature controller, wherein a sample chamber is formed in the probe main body and is used for placing a nuclear magnetic resonance sample tube; the liquid nitrogen spraying cooling device is arranged at the top of the sample chamber and is connected with a pressurized liquid nitrogen tank through an electromagnetic valve; the heating device is arranged at the bottom of the sample chamber; the temperature sensor is used for detecting the temperature in the sample chamber; the temperature sensor, the electromagnetic valve and the heating device areconnected with the temperature controller; and the temperature controller controls the heating temperature of the heating device or the spraying amount of liquid nitrogen in the electromagnetic valveaccording to the temperature in the sample chamber detected by the temperature sensor. The variable temperature probe for nuclear magnetic resonance detection provided by the invention can meet the nuclear magnetic detection requirements of samples under different temperature conditions, and the temperature change span is between -120 DEG C and 100 DEG C.

Description

technical field [0001] The invention relates to a temperature-variable probe for nuclear magnetic resonance detection, belonging to the technical field of nuclear magnetic resonance. Background technique [0002] Nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) technology has been widely studied and applied due to its superior performance. The probe is one of the indispensable core components in the NMR spectrometer. The traditional probe is tested at room temperature. [0003] In the aspect of porous media analysis of materials, it is sometimes necessary to place the sample in an ultra-low temperature environment and to heat it during the experiment, which cannot be satisfied by traditional probes. [0004] Existing temperature-variable probes use nitrogen as a cooling medium, construct a complete set of nitrogen circulation system, and use a pressurization device to change the temperature of nitrogen. This also leads to its bulky and expensive disadvantages, a...

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Problems solved by technology

[0007] In the existing temperature-variable probes used for NMR detection, the temperature range is from -20°C to 100°C, and it can only measure the pore diameter range of the sample cement pore diameter above 10nm. Once the cement pore diameter of the measured sample is less than 10nm, In order to obtain accurate measurement results, the ambient temperature of the sample measurement is required to reach -50°C or even lower. If the low temperature range of the variable temperature probe is still at -20°C, the pore distribution of the measured sample cement will not be accurate enough.

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