Novel Large Area Particle Detection Method And Equipment
Original Publication Date: 1988-Feb-01
Included in the Prior Art Database: 2005-Feb-15
A novel method of particle detection on areas as large as or larger than, a desk top is described. The work surface upon which particles are to be detected is covered with a piece of glass, or quartz, from 3/16 to 1/2 inch thick. The edge of this glass or quartz is illuminated along all of one edge by white light, using a light source which includes fiber optics pathways to direct the light to the edge. If needed, lenses can be used to focus or spread the light and a clamp, attached securely to the edge of the glass or quartz, can be used to confine the light to the edge only. Edge illumination highlights particles on the glass or quartz surface by multiple, frustrated internal reflectance. The intensity of light used is in proportion to the area illuminated.