Method and apparatus for detecting or measuring the presence of humans or biological organism
First Claim
1. 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.
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Abstract
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.
19 Citations
10 Claims
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1. An apparatus for detecting the presence of a human in a predetermined space comprising;
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting the presence of a biological organism in a predetermined space comprising;
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positioning an antenna detecting means in said predetermined area; generating a waveform having a bandwidth and frequency corresponding to an electrical characteristic of said biological organism to be detected representative of the pH value of said biological organism; amplifying said generated waveform and antenna detecting means output in an amplifier calibrated to detect a range including said electrical characteristic correlated to the proper pH range of the biological organism being detected; whereby biological organisms having a predetermined electrical characteristic due to a known pH value can be detected. - View Dependent Claims (8, 9, 10)
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Specification