| 摘要 |
<p>A method and an apparatus is disclosed for controlling electrical loads as a function of displacement detection of objects within a monitored zone by utilizing the non-Doppler shifted component of an electromagnetic, acoustic, microwave, infrared, or optical field. In the case of an ultrasonic field, a transmitter generates an ultrasonic transmission frequency into a zone to be monitored. Information is extracted from the spatial and temporal variation of the amplitude and/or phase of the total ultrasonic field at the original (i.e. non Doppler shifted) frequency of transmission. At a detection stage, after filtering all Doppler returns, the signal received from each of a plurality of receivers/transducers, if not already digital, is digitized and passed to a gate array, microprocessor, or similar processing means where amplitude and/or phase changes are demodulated to control one or more electrical loads, for example, lighting, alarms, A/C according to an embedded algorithm within the processor. These algorithms can process the input signal to self-calibrate the system, may be adaptive, and can incorporate learning by experience features. Artificial intelligence techniques employing expert systems incorporating certainty factors and/or fuzzy logic systems can be employed to construct truly intelligent sensors. Furthermore, any variants of this new type of detector can be combined with each other or with prior art motion detectors or occupancy sensors to form a multi-technology system which minimizes the deficiencies of any single technology.</p> |
