Methods and apparatus for security device portal sensing

Details Methods and apparatus for security device portal sensing Methods and apparatus for security device portal sensing

G - Physics

08

B

G08B 29/04 (2006.01)

Patent

CA 2670979

A security device, according to various aspects of the present invention, detects movement of a provided portal cover. The security device includes a sensor, a bias magnet, and a processor. The sensor provides indicia of a magnitude of a magnetic flux through the sensor. The bias magnet provides the magnetic flux through the sensor. The processor detects a change in the magnitude of the magnetic flux outside an upper boundary and a lower boundary of a first threshold and a second threshold respectively. The sensor does not move with respect to the magnet. Movement between the sensor and the portal cover changes the magnitude of the magnetic flux through the sensor. The processor determines an average value of a series of values of the indicia of the magnitude of the magnetic flux that fall within the upper boundary and the lower boundary of the first threshold. The upper boundary and the lower boundary of the first threshold and the second threshold respectively are set in accordance with the average value.

Selon divers aspects de la présente invention, un dispositif de sécurité détecte le mouvement d'une plaque de portail fournit. Le dispositif de sécurité comprend un capteur, un aimant de polarisation et un processeur. Le capteur fournit des indices d'amplitude d'un flux magnétique traversant le capteur. L'aimant de polarisation crée le flux magnétique traversant le capteur. Le processeur détecte un changement de l'amplitude du flux magnétique situé entre une limite supérieure et d'une limite inférieure d'un premier seuil et d'un second seuil respectivement. Le capteur ne se déplace pas par rapport à l'aimant. Un mouvement entre le capteur et la plaque de portail modifie l'amplitude du flux magnétique à travers le capteur. Le processeur détermine la valeur moyenne d'une série de valeurs des indices de l'amplitude du flux magnétique tombant entre la limite supérieure et la limite inférieure du premier seuil. La limite supérieure et la limite inférieure du premier seuil et du second seuil respectivement sont réglées en fonction de la valeur moyenne.

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