This is a screen capture of the graphical interface for the Andor hardware. The main image is a false colour rendition of the camera view with the display colours corresponding to the photon counts attained over the total exposure time. The graphs at the bottom and side represent peak activity along the x and y axes, relative to the position of the cross hairs.

The side view of the reactor chamber, equipped with a 70 kHz ultrasound transducer located at the base, is shown. The chamber contained a buffered luminol solution which reacts with the OH radicals and products formed during cavitation bubble collapse to give out light at around 425 nm.
During the recording of the sequence, the depth of the liquid was increased, varying the distance from sound source to the reflective surface/air interface. During this process, the interactions of the forward (or incident) wave with the wave reflected from the liquid surface go through constructive and destructive interference, which results in variations in the pressure difference between the high and low pressure regions, effecting the dynamics of cavitation bubble formation and implosion. The intensity and quantity of cavitation events in turn affects OH radical production and distribution within the solution, and consequently, OH radical availibility for the luminol chemical reaction responsible for the observed light.
This allowed the reactor geometries for maximum and minimum OH radical formation to be mapped.