Affiliation:
1. Southwest University of Science and Technology
2. Key Laboratory of Special Environment Robotics of Sichuan Province
3. Chinese Academy of Sciences
Abstract
The coefficient of thermal expansion (CTE) of ultra-low-expansion (ULE)
glass is critical to the development of precision optical systems.
Herein, an ultrasonic immersion pulse-reflection method is proposed to
characterize the CTE of ULE glass. The ultrasonic longitudinal wave
velocity of ULE-glass samples with significantly different CTE values
was measured using a correlation algorithm combined with
moving-average filtering, which can achieve 0.2 m/s precision
with a contribution to the ultrasonic CTE measurement uncertainty of
0.47 ppb/°C. Furthermore, the established ultrasonic CTE
measurement model predicted the 5°C–35°C mean CTE with a
root-mean-square error of 0.9 ppb/°C. Notably, a complete
uncertainty analysis methodology was established in this paper, which
can provide directional guidance for the subsequent development of
higher-performance measurement devices and the improvement of relevant
signal processing procedures.
Funder
Southwest University of Science and
Technology
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering