The SiO₂/TiO₂ multilayer thin films used for narrow band pass filter were fabricated using E-beam evaporation method. The narrow band pass filter was used to enhance the resolution of spectroscopy and sensor applications with near infrared (NIR) light source. The narrow band pass filter with multilayer thin films were designed with Essential Macleod program. The multilayers of SiO₂/TiO₂ with 32 layers were deposited on the silicon encapsulation of IR with peak wavelength (λp) of 660 nm and NIR LEDs with λp of 830 nm, 880 nm, and 955 nm. After NIR light passed through the narrow band pass filter, the full width of half maximum of 33.4~48.6 nm became narrow to 20~24 nm owing to the absorption of photons with short or long wavelength of designed band of 20 nm. The SiO₂/TiO₂ band pass filter fabricated in this study can be used for sensor, optoelectronics, and NIR spectroscopy applications.

In this paper, thermal analysis of HDU (Heat Dissipation Unit) for infrared CCTV is performedby using SolidWorks Simulation (Thermal analysis) package, in order to change the part materials andHDU shape is optimized. Furthermore, HDU disperses the aggregated heat around the LED inside thehousing. The junction temperature of infrared LED checked by HDU check was 65.83℃, 42.02℃,respectively. In addition, the Thermoelement by changing the shape of the HDU was possibly designed andequipped with. Comparison with simulation and prototype measurement results, without HDU model was65.83℃, 61.99℃, respectively. In addition to with HDU model was 42.02℃, 39.01℃, respectively. Only HDUmounted into infrared CCTV is usable in the ordinary house or outdoors. Also HDU with thermal element,fan mounted into infrared CCTV is usable in a blast furnace workplace or high temperature workplace.