Microsystem using magnetometer and inclinometer for anti-theft protection of valuables
First Claim
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1. A device for triggering an alert or a pre-alert when a normally immobile object is detected to move, the device comprising:
- measurement means for generating measured values;
transmission means receiving the values measured by the measurement means and for transmitting the values to processing means for processing the values, and for transmitting the measured values;
message transmission means controlled by the processing means; and
monitoring means comprising, means for receiving the message sent by the message transmission means, and means for triggering the alert, wherein the measurement means comprises at least one magnetometer with at least one axis fixed to the object and for measuring a magnetic field along the at least one axis, wherein the processing means accomplishes at least one of (a) calculating a vector magnitude representative of a movement and (b) generating a movement detection signal by comparing the calculated vector magnitude with a threshold vector magnitude, based on a series of measurements from the measurement means, and wherein the means for triggering the alert is coupled to the processing means and sends an alert message on reception of the detection signal from the processing means.
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Abstract
A device for the detection of movement of a valuable object, for example in a museum in which a device for detecting at least a rotation of the object, and particularly magnetometers or inclinometers, are mechanically fixed to the object. These detecting devices are coupled to a message transmission device that sends a presence message as long as detection has not taken place and an alert type message when detection has taken place. A monitoring station processes these messages or the absence of these messages, to trigger an alert if necessary.
13 Citations
15 Claims
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1. A device for triggering an alert or a pre-alert when a normally immobile object is detected to move, the device comprising:
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measurement means for generating measured values;
transmission means receiving the values measured by the measurement means and for transmitting the values to processing means for processing the values, and for transmitting the measured values;
message transmission means controlled by the processing means; and
monitoring means comprising, means for receiving the message sent by the message transmission means, and means for triggering the alert, wherein the measurement means comprises at least one magnetometer with at least one axis fixed to the object and for measuring a magnetic field along the at least one axis, wherein the processing means accomplishes at least one of (a) calculating a vector magnitude representative of a movement and (b) generating a movement detection signal by comparing the calculated vector magnitude with a threshold vector magnitude, based on a series of measurements from the measurement means, and wherein the means for triggering the alert is coupled to the processing means and sends an alert message on reception of the detection signal from the processing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A monitored object, comprising:
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at least one magnetometer with at least one axis fixed to the object;
means for processing measured values from the at least one magnetometer to detect a rotation movement of the object and to transmit a detection signal; and
message transmission means coupled to the processing means for sending an alert message on reception of the detection signal.
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14. A process for monitoring at least one object in which each object communicates with a monitoring station,
wherein at an object end: -
values of a magnetic field are measured on at least one axis related to the at least one object;
measurement results are transmitted to the monitoring station, the transmission including a presence message; and
at a monitoring station end;
a vector magnitude representative of a movement is calculated from a series of measurements;
a movement detection signal may be produced by comparison of the calculated vector magnitude with a threshold vector magnitude;
an absence message is sent if the presence message is not received during a time exceeding a given duration; and
an alert is triggered if an object movement detection signal is produced. - View Dependent Claims (15)
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Specification