Capacitance Thermometer Probe for Low-Temperature Heat Transport
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Solution Overview
Problem
Existing low-temperature high-precision measurement devices face challenges in precisely measuring physical properties, particularly the thermal Hall effect, due to deviations caused by magnetoresistance effects and the need for multiple thermometer types across different temperature ranges.
Innovation Solution
A probe system for low-temperature high-precision heat transport measurement is developed, featuring a sample loader with thermally isolated support rods and SrTiO3 capacitance thermometers, which allow for precise temperature measurement under high magnetic fields without the need for extensive calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resistance thermometer is used for temperature measurement, then temperature can be measured by measuring resistance, but measurement precision deteriorates due to magnetoresistance effect under high magnetic field
Solution Approach 1:
The patent extracts the harmful magnetoresistance effect by replacing the resistance thermometer with a capacitance thermometer that uses a dielectric material (SrTiO3) insensitive to magnetic fields. The temperature measurement function is preserved while the harmful magnetic field interaction is eliminated by changing the sensing mechanism from electrical resistance to capacitance.
Solution Approach 2:
The patent changes the measurement parameter from electrical resistance to capacitance. By using the dielectric constant of SrTiO3 which varies with temperature but is not affected by magnetic fields, the system achieves magnetic field immunity while maintaining temperature measurement capability through parameter substitution.
2Measurement precision
If different types of thermometers are used for different temperature ranges, then measurement precision is maintained across temperature ranges, but device complexity increases
Solution Approach 1:
The patent makes the SrTiO3 capacitance thermometer universal across a wide temperature range (4K to 300K). The dielectric material maintains its temperature-dependent capacitance properties throughout this range, allowing a single thermometer design to replace multiple specialized thermometers for different temperature regimes.
Solution Approach 2:
The patent uses SrTiO3, a composite ceramic material with specific dielectric properties that remain stable and temperature-sensitive across a broad temperature range. This material choice enables the thermometer to function effectively from cryogenic to room temperature without requiring design changes.
3Measurement precision
If thermal insulation is improved to isolate thermometer and heater, then measurement precision improves, but thermal conductivity of support structure deteriorates
Solution Approach 1:
The patent applies different thermal conductivity properties to different parts of the support structure. The first support rods use thermal insulators to isolate the capacitance thermometer and heater, while the second support rods use thermal conductors to provide stable thermal pathways. This localized differentiation of thermal properties optimizes both measurement precision and thermal reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The probe system enables extremely precise measurement of thermal Hall effects and other physical properties like spin Nernst and Seebeck effects, with improved thermal insulation and reduced self-heating errors, across a wide temperature range.
Implementation Method 1
capacitance thermometers made of a dielectric material, in particular, SrTiO3 capacitance thermometers
Implementation Method 2
capacitance thermometers made of a dielectric material, in particular, SrTiO3 capacitance thermometers
Implementation Method 3
a plurality of first support rods provided on a surface of the sample supporter to extend in a direction away from the surface, made of a thermal insulator
Implementation Method 4
a plurality of second support rods provided on a surface of the sample supporter to extend in a direction away from the surface, made of a high thermal conductor
Implementation Method 5
The physical properties measured using the low-temperature high-precision measurement device capable of maintaining a low temperature and of applying a magnetic field include a thermal Hall effect (THE)
Data Source
AI summary
Provided is a probe system for low-temperature high-precision heat transport measurement, the probe system including a sample loader where a sample is loaded. In the probe system for low-temperature high-precision heat transport measurement, the sample loader includes a first frame including a sample loading space, and a second frame including an open end coupled to the first frame to accommodate the sample loading space.