The terahertz camera has a fixed objective lens and a plurality of detectors positioned at the focal plane of the objective lens. Under this configuration, a cooling performance may be improved and durability may be enhanced. The sensor uses spaced insulated electrodes which are mounted within a granular filled chamber within a water-permeable shell. The system further comprises a plurality of scan tools stored in the memory and accessible for downloading by the computer platform. One conferencing system allows conference participants to share all or a portion of the display seen on their computer screens.