초록 ▼

A method and apparatus for detecting the presence of an object, such as a biological organism, particularly that of a human. Changes occuring upon occupation of a unoccupied spacial location are sensed and analyzed to produce a display, or otherwise used to control other devices. The apparatus inclu

A method and apparatus for detecting the presence of an object, such as a biological organism, particularly that of a human. Changes occuring upon occupation of a unoccupied spacial location are sensed and analyzed to produce a display, or otherwise used to control other devices. The apparatus includes an antennae to detect electromagnetic radiation changes caused by an organism coming into contact with the antennae or in a spacial area in proximity of the antennae. The changes detected by the antennae are coupled through a receiver to a bridge network for analysis. The circuitry of the bridge network compares the changes caused by the detected object to a zero reference. An output from the bridge is applied to a process which compares all signals with a vector preset in the process. Amplitude and phase are compared with known characteristics for the presence of a human body. The process or output can then be used to indicate the presence of a human by a display device or to trigger alarm devices or for other purposes.

대표청구항 ▼

An apparatus for detecting the presence of a human in a predetermined space comprising; antenna detecting means constructed of conductive material for detecting a change in electrical energy in said predetermined space; oscillator means constructed to generate a wave-form having a bandwidth and freq

An apparatus for detecting the presence of a human in a predetermined space comprising; antenna detecting means constructed of conductive material for detecting a change in electrical energy in said predetermined space; oscillator means constructed to generate a wave-form having a bandwidth and frequency selected to represent the conductivity of a human body having a known pH value; a differential amplifier receiving an input from the oscillating means and said antenna detecting means, said differential amplifier being calabrated to respond to a conductivity range proportional to pH values of a human body; log-amplifying means constructed to amplify low level signal inputs in a preselected range and saturate at high level signal inputs whereby said low level signal inputs in said preselected range pass through and all higher level signals are nullified; whereby the presence of a human body in a particular area may be detected from said low level signals in said preselected range which pass through said detecting apparatus, indicating a conductivity proportional to the pH value of a human body.