DIFFERENTIAL RADIATION DETECTION APPARATUS

摘要

The indication of temperature discontinuities in a scene may, when taken with other known facts about the scene, indicate the boundaries of objects, for example the level of the contents of a storage silo. The scene 5 is imaged in thermal radiation 2, 3 upon a pair of adjacent pyroelectric radiation detectors 9, 10. The scene radiation is chopped (14) and the difference in detector outputs displayed (22) to the observer while the field of view of the detectors, aligned with a visual aiming sight, is trasversed across the object. The location and sign of a temperature discontinuity in the visual scene may for example enable the observer to measure the silo contents.