Electronic intrusion detection system for monitored environments

Details Electronic intrusion detection system for monitored environments Electronic intrusion detection system for monitored environments

1998-05-21

2000-06-27

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340538, 340554, 340555, 340692, G08B 1300

Patent

active

060811935

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an electronic intrusion detection system for environments to be monitored.
More particularly the invention is concerned with an electronic remote surveillance device adapted to be employed in combination with monitoring apparatuses, alarm systems, fire alarm devices, antitheft systems, etc.
In the field of the alarm and antitheft systems for protecting civil dwellings and industrial premises there are known monitoring systems that use Doppler or infrared volumetric sensors.
The volumetric sensors based on Doppler effect are substantially small-size radar devices operating in the microwave spectrum, typically 1-10 GHz, capable of detecting a person moving even at an extremely low speed.
On the other hand the infrared volumetric sensors are sensors capable of detecting a temperature difference caused by the passage of a human body in the environment in which the sensors are located, but these sensors cannot detect mechanical vibrations.
In presence of a body moving inside the environment or the space to be monitored, the above mentioned volumetric sensors generate an electric signal that can be applied to a control circuit that in turn actuates alarm warning devices or other devices that draw attention to the event by means of acoustic and/or optical (visual) alarm messages.


BACKGROUND ART

In remotely manned monitoring systems, the acoustic and/or visual signal generated by the sensor(s) is converted into an alarm message and generally transmitted through a radio link or on a telephone line, either public or private, to a receiving device that can be located far away from the monitored place at which the event detection occurred.
As an example, the alarm message can be sent either to a receiving device located in a central control unit manned by private personnel or by policemen, or to a fixed or mobile telephone set, furnished to the surveillance personnel or even to the owner of a house.
The alarm message received through said devices can incorporate information relating to the place at which the event took place, such as for example a predetermined recorded vocal message.
When the person in charge of the surveillance receives such alarm message from a monitored environment, he/she can either directly intervene or arrange for proper actions, such as for example the request for a police intervention.
One of the main inconveniences of the known alarm systems using volumetric sensors that transmit alarm messages to a remote control unit is that the surveillance personnel--or more generally the person that receives such alarm message--is not in condition to discriminate a false alarm caused by a disturbance from a real alarm situation in which a quick intervention is required.
The likelihood of a false alarm is not an infrequent event in spite of the technical improvements to the conventional antitheft systems.
When infrared sensors are used in a monitoring system, many disturbing sources such as natural or artificial light sources, quick changes of temperature, e.g. caused by room convectors, sudden raise of the environment lighting due for example to the front lights of a passing car, are all capable of being detected by the sensors and generating (false) alarm signals. Moreover, the sensitivity of infrared sensors decreases when the environment temperature increases.
When Doppler sensors are used, false alarms can be triggered by electromagnetic disturbances and by accidental movements of objects like a banging door or a falling flowerpot.
Because the alarm message received at the remote location does not contain information allowing the personnnel in charge to decide with certainty whether it is due to a real or a false alarm, such monitoring systems suffer from several drawbacks, such as delayed interventions, or unnecessary interventions, with a reduction of the system reliability.
For example, upon receiving an alarm message through his mobile phone, the owner of a dwelling that is far from home has to decide whether to ask for an intervention, or inf

REFERENCES:
patent: 4060803 (1977-11-01), Ashworth, Jr.
patent: 4182990 (1980-01-01), Coffin et al.
patent: 4857912 (1989-08-01), Everett, Jr. et al.
patent: 5400011 (1995-03-01), Sutton

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