Fiber optic particle detector for measurements in a fluid flow, comprising an optical fiber being acoustically coupled to a mechanical element adapted to be acoustically coupled to the flow, a fiber optic interferometer and a light source providing light in said optical fiber. The device has a back-reflection structure, systematically adapted to the mirror arrangement, for reflecting back onto another portion of the mirror actuators, in targeted fashion, the light reflected onto the back-reflection structure from one portion of the mirror actuators. The microprocessor receives an OS clock tick to execute a real-time program task. The conversion coating is amorphous in nature and can be formed as thin as 1 micron with a coating weight in the range of about 40-250 milligrams per square foot. The client process also uses an environment database to determine which background objects to render as well as to limit the movement of the user’s avatar. Depending on the type of cosmetic packaging, the chip may be positioned in various locations, such as a base portion, a lid portion, a cap, or a side recess.