Anti-intrusion security sensor and security system including said sensor

An intrusion detection security system comprising:

• at least one array comprising a plurality of security sensors, each security sensor of said plurality of security sensors comprising a container body and a signal acquisition and processing module housed in the container body, wherein the signal acquisition and processing module comprises:
• a piezoelectric transducer configured to convert a mechanical stress to which the piezoelectric transducer is subjected into a first electrical signal;
• an accelerometric transducer configured to convert an acceleration to which the accelerometric transducer is subjected into a second electrical signal;
• and
• a processing unit operatively connected to the piezoelectric transducer and to the accelerometric transducer for receiving the first electrical signal and the second electrical signal;
• wherein the processing unit is configured to:
• process the first electrical signal for obtaining a first flow of digital samples having digital values correlated with an amplitude measurement of the first electrical signal;
• process the second electrical signal for obtaining a second flow of digital samples having digital values correlated with an amplitude measurement of the second electrical signal;
• process the first flow of digital samples and the second flow of digital samples for obtaining at least one processed flow of digital samples therefrom, wherein each digital sample of the at least one processed flow of digital samples has a digital value obtained according to a respective digital sample of the first flow of digital samples and a respective digital sample of the second flow of digital samples by a calculation function F which applies a weighting coefficient to at least one of the respective digital sample of the first flow of digital samples and the respective digital sample of the second flow of digital samples;
• and
• detect an intrusion event and/or an environmental event according to an analysis of the at least one processed flow of digital samples;
• and
• a common control unit;
• wherein each security sensor of the plurality of security sensors of the at least one array further comprises a two-way communication interface that operatively connects said security sensors with the common control unit, and wherein the common control unit is configured to:
• determine whether an environmental event is underway;
• and
• send a broadcast message to all the security sensors of the at least one array to vary said weighting coefficient and/or a detection parameter, used by the processing unit to detect an intrusion and/or environmental event underway according to the analysis of the at least one processed flow of digital samples.

A method for detecting an intrusion event and/or an environmental event by at least one security sensor comprising a piezoelectric transducer, an accelerometric transducer and a processing unit operatively connected to the piezoelectric transducer and to the accelerometric transducer, wherein the method comprises:

• converting a mechanical stress to which the piezoelectric transducer is subjected into a first electrical signal;
• converting an acceleration to which the accelerometric transducer is subjected into a second electrical signal;
• providing the processing unit with the first electrical signal and the second electrical signal;
• processing the first electrical signal to obtain a first flow of digital samples having digital values correlated with an amplitude measurement of the first electrical signal;
• processing the second electrical signal to obtain a second flow of digital samples having digital values correlated with an amplitude measurement of the second electrical signal;
• processing the first flow of digital samples and the second flow of digital samples to obtain at least one processed flow of digital samples therefrom, wherein each digital sample of the at least one processed flow of digital samples has a digital value obtained according to a respective digital sample of the first flow of digital samples and a respective digital sample of the second flow of digital samples by a calculation function F which applies a weighting coefficient to at least one of the respective digital sample of the first flow of digital samples and the respective digital sample of the second flow of digital samples;
• and
• detecting an intrusion event and/or an environmental event underway according to an analysis of the at least one processed flow of digital samples.