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Alarm or warning device with sensing means in the form of a D.C. biased shielded coaxial cable
| Details |
Inventors: Hruby, Vincenzo; Vizzotto, Raffaele;
Assignee: Hesa S.p.A. (Milano, IT)
Primary Examiner: Swann, III; Glen R.
Assistant Examiner: Mullen, Jr.; Thomas J.
Attorney, Agent or Firm: Young & Thompson
Alarm or warning device using, as sensing means, a low voltage D.C. biased shielded coaxial cable. The cable is positioned along the periphery of the area under control, and one or both of its ends are connected to an electronic circuit adapted to detect the voltage variations at the cable ends, deriving from its capacity variations resulting from the subsonic shock waves caused by the movement of things or people in the neighborhood of the cable. The device of the invention is used in alarm systems against intrusions and thefts, both for real and personal property. In the first case, it is preferably positioned underground and it may also comprise screening means allowing to detect the movements coming from different directions. The device is also advantageously used in the medical field, for the remote control and warning of the life functions of a patient. |
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DETAILED DESCRIPTION The object of the present invention is therefore to provide a new alarm device, apt to overcome the above drawbacks and allowing to dispose of economic sensing means, which are positively reliable against any possible attempt of elusion or impair, which are perfectly sealed against atmospheric agents and particularly moisture, and which have a long lasting life.
Another object is to provide an alarm device having characteristics such as to require installation works of reduced cost, in case of a permanent alarm device for controlling real property, and of practically no cost, in case of a temporary alarm device for controlling movables.
A further object of the present invention is to supply a new warning device, to be used in the medical field for the remote control of the life functions of a patient, which does not require physical contact between the device, or parts thereof, and the patient himself.
According to the present invention, said objects are reached with an alarm or warning device of the type comprising sensing means in the form of an electrically charged capacitor, and an electronic circuit apt to detect the variations in the electric characteristics of said capacitor and to accordingly energize alarm and warning means, characterized in that, said sensing means consist of at least one shielded coaxial cable, one or both ends of which are connected to said electronic circuit, and in that, a D.
C.
constant biasing potential difference is kept between the shielding and the inner conductor of said cable.
According to an embodiment of the invention--particularly suited for permanent alarm devices controlling real property--the coaxial cable is positioned under the soil surface and parallel thereto, and a substantially vertical continuous baffle slab of a material having a density greater than the surrounding ground is positioned on the side external to that controlled by the alarm device.
According to another embodiment of the invention--particularly suited for temporary alarm devices controlling movables--the coaxial cable is positioned on the soil surface, or onto any suitable support, in proximity of or in contact with the objects to be controlled
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