CN-122016914-A - Linear expansion coefficient measuring system

CN122016914ACN 122016914 ACN122016914 ACN 122016914ACN-122016914-A

Abstract

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

Inventors

BAI JIN
LI JIAWEI
CHENG XINYU
WANG YI
LI WENTAO
LI YAXIN
SUN CHUNYAN

Assignees

安庆师范大学

Dates

Publication Date: 20260512
Application Date: 20260310

Claims (10)

1. The linear expansion coefficient measuring system is characterized by comprising a friction force measuring module, a heating module, a length measuring module and a calculating module; The friction force measuring module is used for measuring the friction force of the sample in the expansion process so as to evaluate the influence of the friction force on the length measurement and provide data for subsequent correction; the heating module provides a controllable heating environment, so that the sample reaches the target temperature according to the set heating rate; The length measurement module is used for accurately measuring the length change of the sample in the heating process and providing basic data for calculating the thermal expansion coefficient; The calculation module calculates the thermal expansion coefficient of the sample according to the data provided by the length measurement module and the friction force measurement module, and corrects and analyzes errors.
2. The system for measuring linear expansion coefficient according to claim 1, wherein the piezoelectric force sensor is arranged between the sample and the carrier in the friction force measuring module, directly measures charge change generated by friction force, outputs an electric signal, and forms friction force according to temperature change.
3. The system for measuring linear expansion coefficient according to claim 1, wherein the heating module is formed by wrapping an inner structure with high temperature resistant silicon rubber, and adding heat insulation cotton on an outer layer to realize uniform distribution, and the temperature is stably controlled within a range of 0-250 ℃.
4. The system of claim 1, wherein the length measuring module comprises a laser interferometer for measuring a minute change in the length of the sample using a principle of laser interferometry.
5. The system for measuring linear expansion coefficient according to claim 1, wherein the calculation module evaluates the influence of friction force on the length measurement according to the friction force measurement data, corrects the length data by a blank test method, and average-processes the thermal expansion coefficients of the temperature points to obtain the average thermal expansion coefficient of the sample.
6. The system of claim 2, wherein the piezoelectric force sensor outputs an electric signal, a signal amplifier amplifies the weak electric signal output by the sensor, a filter removes noise interference, and an analog-to-digital converter converts the analog signal into a digital signal.
7. The linear expansion coefficient measuring system according to claim 4, wherein the laser interferometer measures a minute change in the length of the sample, a curve of the change in the length with temperature is recorded by the data collector, the length data is analyzed, and the expansion amount of the sample at each temperature point is calculated.
8. The system for measuring linear expansion coefficient of claim 5 wherein the correction formula in the calculation module is: ; Wherein the method comprises the steps of Indicating the measured change in length without taking into account the friction effect, Representing the coefficient of influence of friction on the length measurement, Representing the friction force measurement.
9. The linear expansion coefficient measurement system according to claim 3, wherein the temperature of the high temperature resistant rubber is changed by setting a specific target temperature.
10. The system for measuring linear expansion coefficient according to claim 1, wherein the calculation formula of the thermal expansion coefficient α is: ; Wherein the method comprises the steps of The initial length of the sample is indicated, Indicating the amount of temperature change.

Description

Linear expansion coefficient measuring system Technical Field The invention relates to the technical field of material performance measurement, in particular to a linear expansion coefficient measurement system. Background The elongation of a material in one dimension when it expands under heat is called the linear expansion coefficient. The linear expansion coefficient is an important index for representing the material characteristics, and particularly, the linear expansion coefficient of the material is not measured when a new material is developed. In view of the importance of material deformation in physical property research and engineering application, linear expansion coefficient measurement is naturally one of the important contents of common physical experiments of universities of science and engineering. The linear expansion coefficient measuring system generally comprises a heating device, a temperature sensor, a length measuring device and a data acquisition and processing system, wherein in the measuring process, factors such as friction force and the like applied to a sample in the expanding process can interfere with a length measuring result to influence the accuracy of linear expansion coefficient measurement, and therefore, the linear expansion coefficient measuring system is proposed. Disclosure of Invention The present invention is directed to a linear expansion coefficient measuring system, which solves the above-mentioned problems. In order to achieve the aim, the invention provides the technical scheme that the linear expansion coefficient measuring system comprises a friction force measuring module, a heating module, a length measuring module and a calculating module; The friction force measuring module is used for measuring the friction force of the sample in the expansion process so as to evaluate the influence of the friction force on the length measurement and provide data for subsequent correction; the heating module provides a controllable heating environment, so that the sample reaches the target temperature according to the set heating rate; The length measurement module is used for accurately measuring the length change of the sample in the heating process and providing basic data for calculating the thermal expansion coefficient; The calculation module calculates the thermal expansion coefficient of the sample according to the data provided by the length measurement module and the friction force measurement module, and corrects and analyzes errors. Preferably, the piezoelectric force sensor in the friction force measuring module is arranged between the sample and the carrier, directly measures charge change generated by friction force, outputs an electric signal, and forms friction force according to temperature change. Preferably, the heating module wraps the inner structure by high-temperature resistant silicon rubber, and heat insulation cotton is added to the outer layer to realize uniform distribution, so that the temperature is stably controlled within the range of 0-250 ℃. Preferably, the length measurement module comprises a laser interferometer, and measures small changes in the length of the sample using the principle of laser interferometry. Preferably, the calculation module evaluates the influence of friction force on the length measurement according to the friction force measurement data, corrects the length data by adopting a blank test method, and performs average treatment on the thermal expansion coefficient of each temperature point to obtain the average thermal expansion coefficient of the sample. Preferably, the piezoelectric force sensor outputs an electric signal, a signal amplifier is used for amplifying a weak electric signal output by the sensor, noise interference is removed through a filter, and an analog-to-digital converter is used for converting an analog signal into a digital signal. Preferably, the laser interferometer measures the tiny change of the length of the sample, a data collector is used for recording the curve of the length along with the temperature change, the length data is analyzed, and the expansion amount of the sample at each temperature point is calculated. Preferably, the correction formula in the calculation module is: ; Wherein the method comprises the steps of Indicating the measured change in length without taking into account the friction effect,Representing the coefficient of influence of friction on the length measurement,Representing the friction force measurement. Preferably, the high temperature resistant rubber changes the temperature of the high temperature resistant rubber by setting a specific target temperature. Preferably, the calculation formula of the thermal expansion coefficient α is: ; Wherein the method comprises the steps of The initial length of the sample is indicated,Indicating the amount of temperature change. Compared with the prior art, the invention has the beneficial effects that: According