IRV1 and IRV2 series
The IRV Series Infrared (IR) Viewers are used to view laser or laser diode light sources emitting in the near infrared. Four viewers are available: The IRV1 Series are small, battery operated, low-cost IR viewers. The IRV2 Series infrared viewers are slightly larger, battery operated IR viewers that can also be powered with an external 3 VDC power supply (not included). The IRV1 and IRV2 Series include the handle, an IR filter and a case, and have a 1/4-20 threaded hole for handle attachment, post or tripod mounting. All IRV2 versions , except IRV2-270, include an extra 2.5X lens, where switching between 1X and 2.5X is simple and straightforward. IRV2-270 comes only with a 1X lens, due to the high UV absorption of the 2.5X lens.
Typically, the sensitivity of the IR viewer quickly is reduced starting from 1300 nm. However, it is possible to observe low intensity IR beam with proper viewing conditions, such as the spectral filtration, reduced external background noise, short distance of observation, the use of a metallic surface for viewing the IR reflective radiation (instead of a paper material, which has high absorption in IR).THE APPROXIMATE minimal power densities, required for the viewing of infrared laser beam at one meter distance, are:3 mW/cm² for 1.5 µm50 mW/cm² for 1.7 µm180mW/cm² for 1.8 µm1 W/cm² for 1.9 µm2 W/cm² for 2.0 µm