Abstract
A variety of pulse compression methods are viewed as viable solutions to improve the signal to noise ratio (SNR) of received signal in air-coupled ultrasonic testing. However, the use of corresponding method to realistic inspection is faced with problem of optimal parameter selection to get better compression effect. Based on the basic principle of pulse compression method and its implementation in ultrasonic testing, an air-coupled ultrasonic testing system with function of real-time pulse compression processing of ultrasonic signal was established. The impact of key parameters of linear frequency modulation, nonlinear frequency modulation and phase coded pulse compression method on compression effect in narrow-band air-coupled ultrasonic transducer was analyzed, respectively, and then the optimal parameter selection criteria was acquired. Finally, the corresponding pulse compression method of optimized parameters was verified in air-coupled ultrasonic inspection of a honeycomb sandwich composite sample with simulated defects.
| Original language | English |
|---|---|
| Pages (from-to) | 1-7 |
| Number of pages | 7 |
| Journal | Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics |
| Volume | 41 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Jan 2015 |
Keywords
- Air-coupled ultrasound
- Nondestructive testing
- Parameter optimization
- Pulse compression method
- Signal to noise ratio
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