Abstract
An air-coupled acoustic matching layer, based on hollow glass microsphere composite, was developed for air-coupled ultrasonic transducers. The effects of the matrix, powder series, and volume fraction were systematically analyzed by acoustic and rheological characterization. The optimized hollow glass microsphere-epoxy composite showed a superior air-coupling performance, with a characteristics acoustic impedance of 1.08 MRayl and attenuation coefficient of 0.05 dB/mm, respectively. To validate the developed composite, an air-coupled ultrasonic transducer was fabricated with piezoelectric ceramic vibrator, and its feasibility for application in a gas flowmeter was demonstrated. The developed composite exhibits a suitable air-coupling performance for a high-accuracy ultrasonic gas flowmeter.
| Original language | English |
|---|---|
| Pages (from-to) | 32036-32048 |
| Number of pages | 13 |
| Journal | Ceramics International |
| Volume | 48 |
| Issue number | 21 |
| DOIs | |
| State | Published - 1 Nov 2022 |
Keywords
- Air-coupling
- Ceramic composite
- Hollow glass microspheres
- Matching layer
- Ultrasonic transducer