Guo BI, Tao-lin XU, Yun-feng Peng, et al. Feature extraction of acoustic emission signal for diamond scratching of optical glass BK7[J]. Optics and precision engineering, 2017, 25(4): 934-942.
DOI:
Guo BI, Tao-lin XU, Yun-feng Peng, et al. Feature extraction of acoustic emission signal for diamond scratching of optical glass BK7[J]. Optics and precision engineering, 2017, 25(4): 934-942. DOI: 10.3788/OPE.20172504.0934.
Feature extraction of acoustic emission signal for diamond scratching of optical glass BK7
By focusing on the diamond scratching of BK7 optical glass
the Acoustic Emission (AE) mechanism in the brittle removal of optical brittle materials was analyzed and a feature extraction technique of AE signals used in processing and monitoring of optical brittle materials was studied. Various cutting depth test results show that features of brittle removal for optical glass BK7 mainly focus on two frequency bands that are[100
200] kHz and[300
400] kHz
and they correspond to different AE mechanisms. In which
filtered signal of frequency band[100
200] kHz presents obvious burst-type AE phenomenon with a time interval
which is closely related to the production and extension of cracks for optical brittle materials. On the basis of the results mentioned above
a monitoring method that uses burst-type AE events as unit was proposed. Aimed at RMS (Root Mean Square) signals of the band-pass filtering
a recognition algorithm of AE events based on convex optimization theory was studied to get the time and energy information of crack growth for optical brittle materials. It concludes that the feature monitoring method that uses AE events as unit has specific physical meanings and represents removal process of optical brittle materials more objectively.
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references
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