A system for applying a protective coating to a surface includes a device for applying a protective coating to a surface. A first epitaxial substrate having a first epitaxial growth surface is provided. The method includes providing a patch device, coupling an electronic module to the patch device to provide a wearable device, and monitoring health of a user using the wearable device. The image disposal device uses the trigger pulse signal to determine when to dispose an image from the image source. A processing subsystem produces information of the composition of the sample based on the optical emissions detected by said sensor.