초록 ▼

A multiple sensing technology-based occupancy sensor. Ultrasonic and infrared 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 combined estimator is then used to switch elec

A multiple sensing technology-based occupancy sensor. Ultrasonic and infrared 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 combined 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 probability 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 occurrence of false tripping.

대표청구항 ▼

[ What is claimed is:] [1.] An occupancy based load controller, comprising:at least one occupancy sensor for producing at least one occupancy estimator signal indicative of motion within a space;a programmable microprocessor, connected to said at least one occupancy sensor, for calculating an occupa

[ What is claimed is:] [1.] An occupancy based load controller, comprising:at least one occupancy sensor for producing at least one occupancy estimator signal indicative of motion within a space;a programmable microprocessor, connected to said at least one occupancy sensor, for calculating an occupancy signal from said at least one occupancy estimator signal, for comparing said occupancy signal to an activation threshold, and for adjusting a sensitivity of said at least one occupancy sensor as a function of time-varying noise that corrupts said at least one occupancy estimator signal when said electrical load is de-energized; anda controllable load energizing device responsive to said programmable microprocessor, operable to automatically energize an electrical load when said microprocessor determines that said occupancy signal is greater than said activation threshold.