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- Title
Noise Tolerant and Wireless AE Measurement System for Process Monitoring.
- Authors
Kaita Ito; Kazuki Takahashi; Manabu Enoki
- Abstract
Process monitoring is one of the important applications of acoustic emission (AE) method. During manufacturing process of materials and structures, microscopic defects affect their performance and reliability in some cases. AE method is an effective in-situ NDE technology for detection of occurrence of such defects. However, there are two problems here. Firstly, AE process monitoring is often disturbed by strong noise. Secondly, cables installation for AE measurement is often forbidden due to operational reason at the site, or it is impossible when the sensors are placed in sealed or rotating parts. The first problem can be suppressed by AE streaming with digital noise filter in the frequency domain. And the second problem can be avoided by wireless measurement. In order to solve both problems simultaneously, a wireless AE measurement system with streaming support was developed in this study. Two channels of streams with about 4 MHz of sampling frequency is available by a battery-powered computer board. Acquired waveforms are immediately transmitted to a high performance remote computer via Wi-Fi to do heavy processing for noise reduction and event detection. The noise level in the acquired waveform was lower than that of the conventional wired system because the wireless computer board was electrically insulated from the external power line. Furthermore, the new wireless system can use the same noise filter with heavy calculation as the conventional wired system. As a result, the new system enabled high effectiveness for process monitoring by high noise tolerance and wireless stream acquisition.
- Subjects
ACOUSTIC emission; NONDESTRUCTIVE testing; MANUFACTURING processes; WIRELESS communications; REMOTE computer terminals
- Publication
Journal of Acoustic Emission, 2019, Vol 36, pS23
- ISSN
0730-0050
- Publication type
Article