Expansion force testerIt is a professional instrument used to measure the expansion characteristics of materials under heating, compression, or water absorption conditions. Its core function is to derive the expansion coefficient or mechanical parameters by monitoring deformation data, and it is widely used in fields such as geology, metallurgy, chemical engineering, construction, and energy.
The expansion force testerMain types and technical characteristics:
According to measurement principles and application scenarios, expansion force measuring instruments can be divided into the following types:
Mechanical expansion instrument
Structure: Use a micrometer or lever amplification mechanism to directly measure the deformation of the sample.
Features: Simple structure, low cost, but sensitivity is limited by mechanical friction.
Application: Measurement of metal thermal expansion coefficient and testing of concrete shrinkage and expansion.
Example: A simple micrometer expansion instrument transfers the deformation of the sample to the micrometer through a quartz transmission rod, with an accuracy of 0.001mm.
Optical dilatometer
Structure: Optical lever or laser interference technology is used to amplify deformation, combined with photographic recording or photoelectric sensor data acquisition.
Features: High sensitivity (up to nanometer level), low inertness, but complex equipment.
Application: Research on metal phase transition, analysis of thermal expansion of precision materials.
Example: Differential optical dilatometer, using a 30 ° -60 ° right angled triangular optical lever to eliminate elongation interference between the sample and the standard sample, and improve measurement accuracy.
Electromagnetic expansion meter
Structure: Utilizing the principle of electromagnetic induction to detect sample deformation, such as capacitive or inductive sensors.
Features: Non contact measurement, strong anti-interference ability, but requires calibration of sensor parameters.
Application: Material expansion testing and dynamic deformation monitoring in high-temperature environments.
Geotechnical expansion instrument
Structure: Combining rigid ring cutters, vacuum saturation systems, and soil pressure boxes to simulate in-situ soil conditions.
Features: It can actively control saturation state, reduce end constraint effects, and provide reliable data.
Application: Swelling force testing of expansive soil and research on disaster management.
Example: A new type of expansion force tester uses a large-diameter rigid ring knife to collect undisturbed soil samples, combined with a vacuum pump to control saturation speed, reducing testing time by more than 50%.