Method for measuring thermal expansion coefficient of ultralow-expansion glass

Abstract

The invention relates to a method for measuring the thermal expansion coefficient of ultralow-expansion glass, and belongs to the technical field of ultrasonic detection. Ultrasonic propagation ratesat different positions of a radial mark of the ultralow-expansion glass are measured by using a water immersion type ultrasonic pulse echo method so as to achieve the measurement of the thermal expansion coefficient of the ultralow-expansion glass. The thermal expansion coefficient and the ultrasonic propagation rate of the ultralow-expansion glass are related to the TiO2 content in the glass, related researches show that the thermal expansion coefficient [alpha] of the ultralow-expansion glass and the ultrasonic propagation rate V are in a linear relationship, so that the thermal expansion coefficients at different positions can be deduced by measuring the ultrasonic propagation rates at different positions of the ultralow-expansion glass.

Description

technical field [0001] The invention relates to a method for measuring the thermal expansion coefficient of ultra-low expansion glass based on water immersion ultrasonic pulse echo, which belongs to the technical field of ultrasonic detection and can be used to quickly and non-destructively measure the thermal expansion coefficient of ultra-low expansion glass. Background technique [0002] Ultra-low expansion glass has the following advantages: (1) The coefficient of thermal expansion (CTE) is close to zero, which ensures that it has good dimensional stability in harsh temperature environments; (2) It has good optical processability and is easy to obtain High-quality optical surface shape; (3) Different from glass-ceramic, which is composed of glass phase and microcrystalline phase, ULE is a uniform glass single-phase material with stable composition, so it has excellent thermal processing performance, can be spliced ​​and processed, and is easy to apply to Large-scale deve...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a new measurement method based on the destructiveness of the ultra-low expansion glass and the time-consuming and labor-intensive measurement of the existing interferometry measurement and photoelastic analysis measurement, that is, a method based on water immersion Measuring method of thermal expansion coefficient of ultra-low expansion glass based on ultrasonic pulse echo

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