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. 2017 Jun 6;7:2833. doi: 10.1038/s41598-017-02839-1

Figure 4.

Figure 4

Experimental set-up of the photo-acoustic measurement. Inset (a): Variable volume photoacoustic cell, 1-quartz window, 2-sample, 3-quartz cylinder, 4-microphone, 5-inox cell body, 6-threaded flange, 7-sound labyrinth, 8-O-ring.