OCCUPANCY SENSOR AND METHOD OF OPERATING SAME

摘要

A multiple sensing technology-based occupancy sensor. Ultrasonic and infrare d sensors are used to produce first and second occupancy estimator signals that are combined using a fusion based detection algorithm to produce a combined estimator signal. The combin ed estimator is then used to switch electrical loads when the combined estimator signal is above a predetermined threshold. The result is an occupancy sensor that has a very high probabilit y of occupancy detection and a low probability of false tripping. In addition, infrared sensitivity is adjusted based upon an estimation of the background noise in order to minimize the occurren ce of false tripping.