Design And Manufacture Interference Filter Applied In Criminal Investigation And Test Optical System

As the rapid development of optical technology. making use of optical ways to find out different material evidences in criminal spot, the merit which doesn't damage the material evidences makes it achieve the vast appliance in criminal investigation and test optical system. Multi-band lamp house is adopted to achieve all kinds of field traces and its corn is interference filter system, which can utilize interference cut-off filters of different performances to output different wave-band beams. Through assembling interference filters. adopting electronic beaming depositing method with the aid of ION deposition systems, at the same time, combining interference filter theory and film designing software, the rectangular wave of high transmissivity in 450nm-520nm and 450nm-720nm with the low cost and high quality is designed and manufactured.It is demanded that transmissivity in pass wave is more than 99% and the other wave-band is less than 0.2%.its slope is less than 3% so that they are used to search the sap in clothes and minim traces. In addition, it passes the test of mechanical performance and environment. The reason why the corrugation appears and how to compress the corrugation in film designing are mainly discussed in designing the coating structure, and we introduce the equipment and technics factors.