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

Figure 3. Ultrasound modulation causes a spatial pattern in the projection of incoherent LED light in water.

Figure 3

When the unmodulated LED light propagation (RF off) is sampled at a projected distance of 113 mm, the normalized incoherent light distribution is relatively smooth and uniform over the detection window. However when the light passes through an ultrasound focal zone (1 MHz, located 10 mm from the LED and 103 mm from the projection plane), the light displays a pattern having a central peak with smaller maxima or side lobes on either side with an average peak spacing of 8.5 mm.