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. 2021 Apr 18;21(8):2853. doi: 10.3390/s21082853

Figure 10.

Figure 10

Difference of thermal images: |ag1b-ag2b|, where ag1b−matrix (320 × 240) of the thermal image of the angle grinder with 1 blocked air inlet, ag2b−matrix (320 × 240) of the thermal image of the angle grinder with 2 blocked air inlets.