Linear expansion coefficient measuring system

Abstract

The invention discloses a linear expansion coefficient measurement system, and relates to the technical field of material performance measurement, the linear expansion coefficient measurement system comprises a friction force measurement module, a heating module, a length measurement module and a calculation module, the friction force measurement module is used for measuring the friction force borne by a sample in the expansion process, and the heating module is used for heating the sample; according to the linear expansion coefficient measuring system, the friction force measuring module is used for measuring the friction force of the sample in the expansion process to evaluate the influence of the friction force on length measurement and provide data for subsequent correction, and the heating module provides a controllable heating environment to enable the sample to reach the target temperature according to the set temperature rise rate. The linear expansion coefficient is measured and corrected, so that the interference of friction force on length measurement is effectively eliminated, the accuracy of linear expansion coefficient measurement is improved, correction and error analysis are carried out on measured data, and the accuracy and credibility of a measured result are further improved.

Description

Technical Field

[0001] This invention relates to the field of material property measurement technology, specifically to a system for measuring the coefficient of linear expansion. Background Technology

[0002] The elongation of a material in one dimension when it expands due to heat is called the coefficient of linear expansion. The coefficient of linear expansion is an important indicator characterizing material properties, especially crucial for developing new materials, where its measurement is indispensable. Given the importance of material deformation in property research and engineering applications, the determination of the coefficient of linear expansion has naturally become an important part of general physics experiments in science and engineering universities.

[0003] A linear expansion coefficient measurement system typically consists of a heating device, a temperature sensor, a length measuring device, and a data acquisition and processing system. During the measurement process, factors such as friction experienced by the sample during expansion can interfere with the length measurement results and affect the accuracy of the linear expansion coefficient measurement. Therefore, we propose a linear expansion coefficient measurement system. Summary of the Invention

[0004] The purpose of this invention is to provide a linear expansion coefficient measurement system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a linear expansion coefficient measurement system, the measurement system comprising a friction force measurement module, a heating module, a length measurement module, and a calculation module;

[0006] The friction force measurement module is used to measure the friction force experienced by the sample during expansion to assess its impact on length measurement and provide data for subsequent corrections.

[0007] The heating module provides a controllable heating environment, enabling the sample to reach the target temperature at a set heating rate;

[0008] The length measurement module is used to accurately measure the length change of the sample during the heating process, providing basic data for calculating the coefficient of thermal expansion.

[0009] The calculation module calculates the coefficient of thermal expansion of the sample based on the data provided by the length measurement module and the friction measurement module, and performs corrections and error analysis.

[0010] Preferably, in the friction force measurement module, the piezoelectric force sensor is installed between the sample and the carrier to directly measure the charge change generated by friction, output an electrical signal, and generate friction force based on temperature changes.

[0011] Preferably, the heating module has its internal structure wrapped with high-temperature resistant silicone rubber, and heat insulation cotton is added to the outer layer to achieve uniform distribution and stabilize the temperature within the range of 0-250℃.

[0012] Preferably, the length measurement module includes a laser interferometer, which uses the principle of laser interferometry to measure minute changes in the sample length.

[0013] Preferably, the calculation module evaluates the influence of friction on length measurement based on friction measurement data, corrects the length data using a blank test method, and averages the thermal expansion coefficients at each temperature point to obtain the average thermal expansion coefficient of the sample.

[0014] Preferably, the piezoelectric force sensor outputs an electrical signal, which is amplified by a signal amplifier, the noise interference is removed by a filter, and the analog signal is converted into a digital signal by an analog-to-digital converter.

[0015] Preferably, the laser interferometer measures minute changes in the sample length, records the length-temperature change curve using a data acquisition device, analyzes the length data, and calculates the sample expansion at each temperature point.

[0016] Preferably, the correction formula in the calculation module is:

[0017] ;

[0018] in This indicates the measured length change without considering the effect of friction. This represents the coefficient indicating the influence of friction on length measurement. This indicates the measured value of friction force.

[0019] Preferably, the temperature of the high-temperature resistant rubber is changed by setting a specific target temperature.

[0020] Preferably, the formula for calculating the coefficient of thermal expansion α is:

[0021] ;

[0022] in Indicates the initial length of the sample. It represents the amount of temperature change.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This invention, by setting up this measurement system, accurately measures the friction force during the sample expansion process through the friction force measurement module and corrects it, effectively eliminating the interference of friction force on length measurement, thereby improving the accuracy of linear expansion coefficient measurement. The correction and error analysis of the measurement data further improve the accuracy and reliability of the measurement results. Attached Figure Description

[0025] Figure 1This is a flowchart illustrating the working structure of the system of the present invention; Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example: Please refer to Figure 1 The present invention provides a technical solution: a linear expansion coefficient measurement system, the measurement system including a friction force measurement module, a heating module, a length measurement module and a calculation module;

[0028] The friction force measurement module is used to measure the friction force experienced by the sample during expansion to assess its impact on length measurement and provide data for subsequent corrections.

[0029] The heating module provides a controllable heating environment, enabling the sample to reach the target temperature at a set heating rate;

[0030] The length measurement module is used to accurately measure the length change of the sample during the heating process, providing basic data for calculating the coefficient of thermal expansion.

[0031] The calculation module calculates the coefficient of thermal expansion of the sample based on the data provided by the length measurement module and the friction measurement module, and performs corrections and error analysis.

[0032] In the friction force measurement module, a piezoelectric force sensor is installed between the sample and the carrier to directly measure the change in charge generated by friction and output an electrical signal. The friction force is generated based on the temperature change.

[0033] The heating module has its internal structure wrapped with high-temperature resistant silicone rubber, and heat insulation cotton is added to the outer layer to achieve uniform distribution and stabilize the temperature within the range of 0-250℃.

[0034] The length measurement module includes a laser interferometer, which uses the principle of laser interferometry to measure minute changes in the length of the sample.

[0035] The calculation module evaluates the impact of friction on length measurement based on friction measurement data, corrects the length data using a blank test method, and averages the thermal expansion coefficients at each temperature point to obtain the average thermal expansion coefficient of the sample.

[0036] The piezoelectric force sensor outputs an electrical signal. A signal amplifier amplifies the weak electrical signal output by the sensor, a filter removes noise interference, and an analog-to-digital converter converts the analog signal into a digital signal.

[0037] A laser interferometer measures minute changes in the sample length, a data acquisition device records the length-temperature curve, analyzes the length data, and calculates the sample's expansion at each temperature point.

[0038] The correction formula in the calculation module is:

[0039] ;

[0040] in This indicates the measured length change without considering the effect of friction. This represents the coefficient indicating the influence of friction on length measurement. This indicates the measured value of friction force.

[0041] High-temperature resistant rubber can change its temperature by setting a specific target temperature.

[0042] The formula for calculating the coefficient of thermal expansion α is:

[0043] ;

[0044] in Indicates the initial length of the sample. It represents the amount of temperature change.

[0045] The specific implementation method of this embodiment is as follows:

[0046] A piezoelectric force sensor is installed between the sample and the support to directly measure the change in charge generated by friction and output an electrical signal. A signal amplifier amplifies the weak electrical signal output by the sensor, a filter removes noise interference, and an analog-to-digital converter converts the analog signal into a digital signal. Friction is generated based on temperature changes, and a data acquisition device records the friction force versus temperature curve. The temperature of the high-temperature resistant rubber is changed by setting a specific target temperature, and a temperature sensor monitors the sample temperature in real time. The principle of laser interferometry is used to measure minute changes in the sample length, and the data acquisition device records the length versus temperature curve. The length data is analyzed, and the expansion of the sample at each temperature point is calculated. Based on the friction force measurement data, the influence of friction on length measurement is evaluated, and a blank test method is used to correct the length data. The thermal expansion coefficients at each temperature point are averaged to obtain the average thermal expansion coefficient of the sample.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for measuring the coefficient of linear expansion, characterized in that: The measurement system includes a friction force measurement module, a heating module, a length measurement module, and a calculation module; The friction force measurement module is used to measure the friction force experienced by the sample during expansion to assess its impact on length measurement and provide data for subsequent corrections. The heating module provides a controllable heating environment, enabling the sample to reach the target temperature at a set heating rate; The length measurement module is used to accurately measure the length change of the sample during the heating process, providing basic data for calculating the coefficient of thermal expansion. The calculation module calculates the coefficient of thermal expansion of the sample based on the data provided by the length measurement module and the friction measurement module, and performs corrections and error analysis.

2. The linear expansion coefficient measurement system according to claim 1, characterized in that: In the friction force measurement module, a piezoelectric force sensor is installed between the sample and the carrier to directly measure the charge change generated by friction, output an electrical signal, and generate friction force based on temperature changes.

3. The linear expansion coefficient measurement system according to claim 1, characterized in that: The heating module has its internal structure wrapped with high-temperature resistant silicone rubber, and heat insulation cotton is added to the outer layer to achieve uniform distribution and stabilize the temperature within the range of 0-250℃.

4. The linear expansion coefficient measurement system according to claim 1, characterized in that: The length measurement module includes a laser interferometer, which uses the principle of laser interferometry to measure minute changes in the length of the sample.

5. The linear expansion coefficient measurement system according to claim 1, characterized in that: The calculation module evaluates the influence of friction on length measurement based on friction measurement data, corrects the length data using a blank test method, and averages the thermal expansion coefficients at each temperature point to obtain the average thermal expansion coefficient of the sample.

6. The linear expansion coefficient measurement system according to claim 2, characterized in that: The piezoelectric force sensor outputs an electrical signal. The weak electrical signal output by the sensor is amplified by a signal amplifier, noise interference is removed by a filter, and the analog signal is converted into a digital signal by an analog-to-digital converter.

7. The linear expansion coefficient measurement system according to claim 4, characterized in that: The laser interferometer measures minute changes in the sample length, records the length-temperature variation curve using a data acquisition device, analyzes the length data, and calculates the sample expansion at each temperature point.

8. The linear expansion coefficient measurement system according to claim 5, characterized in that: The correction formula in the calculation module is: ； in This indicates the measured length change without considering the effect of friction. This represents the coefficient indicating the influence of friction on length measurement. This indicates the measured value of friction force.

9. The linear expansion coefficient measurement system according to claim 3, characterized in that: The temperature of the high-temperature resistant rubber can be changed by setting a specific target temperature.

10. The linear expansion coefficient measurement system according to claim 1, characterized in that: The formula for calculating the coefficient of thermal expansion α is: ； in Indicates the initial length of the sample. It represents the amount of temperature change.

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