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. 2014 Aug 8;9(8):e104268. doi: 10.1371/journal.pone.0104268

Figure 4. Ultrasound modulation causes a spatial pattern in the projection of incoherent LED light in milk.

Figure 4

Passing LED light through a continuous wave ultrasound focal zone (1 MHz, located 10 mm from the LED and 103 mm from the projection plane) causes acoustic modulation of the light. In a turbid medium consisting of a suspension of milk, the projection of the LED light at 113 mm consists of a peak located at the center of the optical window and adjacent smaller maxima or side lobes. With increasing milk concentration, the spatial pattern does not change but the AOM signal decreases and the lobes appear better resolved.