Development of a 10K TO 77K Magnetic Refrigerator

The ability of high speed photography to record useful images of spray plumes generated by metal atomizers, metal spray deposition equipment, and plasma spray coatings depends on a light source capable of providing illumination suitable to record high velocity, specularly reflecting droplets. Due to the reflective nature of the surface of these particles, point sources and collimated light only allow a small portion of a particle surface to be recorded. A diffuse light source is necessary to provide illumination of the complete surface area. Ordinary diffusers, while providing a wider illumination angle, do not provide sufficient energy (when used with a short pulse) to expose film. A diffuse, but condensed, light source is needed to fulfill these requirements. To meet this need, North Danger Labs. Inc. (NDL) proposes to develop a unique Holographic Consensing Illuminator (HCI) capable of providing diffuse light, condensed to fit the desired imaging area with minimal loss of power. Single or multiple diffuse beams in front or back lit format with any beam shape will be possible. By tailoring the diffuse illumination exactly to be the testbed, the HCI will provide the imaging lens with highest illumination for recording.