High-resolution heat flow signal measuring system for wide temperature range in high magnetic environment

Abstract

The invention discloses a high-resolution heat flow signal measuring system for a wide temperature range in a high magnetic environment. The high-resolution heat flow signal measuring system is composed of two constant-current source circuits, a heat flow sensor, a low-temperature-drift low-noise amplifier module and a signal measuring circuit. The two constant-current source circuits can adjust feedback, supply power to the platinum wire temperature measuring thermal resistors symmetric in pairs of the heat flow sensor, and calculate a temperature difference by a voltage difference generatedby the two groups of platinum wire temperature measuring thermal resistors, thereby generating a differential thermal signal. The differential thermal signal is amplified by a group of low-temperature-drifting low-noise amplifier module, and finally is acquired and measured by a high-resolution 24-bit [sigma]-[delta] analog-to-digital converter. Compared with the prior art, the high-resolution heat flow signal measuring system has the following characteristics that 1, the heat flow sensor has a paramagnetic property and is not affected by the strong magnetic environment; 2, the heat flow sensor has a wide temperature measurement range; 3, the heat flow sensor can generate a large heat flow signal with good repeatability; and 4,a heat flow signal amplification module has magnetic shieldingand a constant-temperature housing, and eliminates the influence of noise and temperature drift.

Description

technical field [0001] The invention relates to the field of heat flow signal measurement, in particular to a high-resolution heat flow signal measurement system used in a high magnetic environment and wide temperature range. Background technique [0002] The magnetic environment can have an impact on the phase formation and performance of the material. In a high magnetic field environment with a magnetic flux density exceeding 1 Tesla, the temperature range is from 100K to 973K. Experiments have important scientific value for the study of new phenomena and mechanisms of materials. Therefore, it is very meaningful to manufacture a thermal analysis instrument used in a wide temperature range in a magnetic environment to measure the phase formation and properties of materials. [0003] The core technology of the differential scanning calorimeter is to measure the heat flow signal, which is generated by measuring the temperature difference between the sample temperature and the...

AI Technical Summary

Problems solved by technology

If a platinum rhodium 10-platinum paramagnetic material thermocouple is used, the influence of the magnetic environment can be eliminated, but the platinum rhodium 10-platinum thermocouple cannot measure the temperature below 200K

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