High performance human information sensing system, which can monitor the human conditions in a room, especially the number of occupants, their locations and activities, has been developed. The sensor head module of this sensing system consists of a vertical one-dimensional 16-element array detector fabricated by sheet forming method of pyroelectric PbTiO 3 ceramics, an IR-transparent spherical lens, a horizontal scanning mechanical part and a cylindrical mechanical chopping part. The IR lens characteristics have been determined to optimize the sensor output. The sensor is able to detect a two-dimensional thermal distribution (16x60) and the human condition information in a room. The sensor is cost-effective and the sensor head module is small (64 mm in diameter and 79 mm in height) with high resolution. Furthermore, nine times higher resolution with 48x180 thermal distribution was accomplished by the neighbor output averaging scheme. By using this sensing system with high sensitivity and high resolution, the small thermal object such as a lighted cigarette as well as the number of persons in a room can be detected accurately.