Monitoring laser cleaning process using acoustic signal

Laser-based cleaning process received great attentions from various type of industries as it promotes fast, efficient and environment friendly. Due to this facts, significant numbers of studies had been recorded to deeply understand how the cleaning quality of various materials could be achieved. Ap...

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Bibliographic Details
Main Authors: Lim, Z. W., Yusof, M. F. M., Quazi, M., Halil, M. A., Ishak, M.
Format: Conference Proceeding
Language:English
Subjects:
Boron steels
Cleaning
Corrosion
Laser applications
Lasers
Monitoring
Signal processing
Steel plates
Substrates
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Summary:Laser-based cleaning process received great attentions from various type of industries as it promotes fast, efficient and environment friendly. Due to this facts, significant numbers of studies had been recorded to deeply understand how the cleaning quality of various materials could be achieved. Apart from process optimization, the real-time monitoring system for the laser cleaning process was also helpful even though not many studies had focused on this angle. This paper presents the monitoring work of laser cleaning process through the analysis of the captured sound signal during the process. To achieve the aim, the corroded boron steel plate was prepared by exposed it to the ambient air for 10 days. Laser cleaning process was done with 4-Loop laser scan. The scanning speed was set to be varied from 100 mm/s to 1000 mm/s. At the same time, the free-field microphone was attached 25 cm from the laser spot to acquire the sound signal from 20 Hz to 10 kHz during the cleaning process. The results show that the process with 1000 mm/s scanning speed recorded the clean surface without the morphological change on the cleaned area. Analysis of the acquired signal shows that the RMS of sound signal was approximately 0.3 mV during the process of eliminating the corroded substrate. The value drop to almost zero when the corroded substrate was fully eliminated from the surface of the specimen. This finding show that the trend of the acquired sound gives the significant information related to the completion of cleaning process without waiting for the process to complete the loop. This work shows the potential of using the sound signal to monitor the laser cleaning process. With further advancement, this method was possibly becoming the fast, robust and high demanding in future.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0189814