Device for detecting the fall of a body into a swimming pool

G - Physics – 08 – B

Patent

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G08B 21/08 (2006.01)

Patent

CA 2493962

The invention concerns a device for delivering a warning signal upon detection of a gravitational wave generated by the fall of a body into a swimming pool using a differential detector comprising comparing means (20) for comparing the sensitivity threshold value with the electric signal value received and for delivering a warning signal when the received electric signal exceeds the sensitivity threshold. The electric signal resulting from the sensed waves is supplied to a comparator (44) and enables variable-width pulses (S3) to be supplied by a programmed microprocessor (38) in the comparator input so as to reduce the sensitivity of the device when the device detects an atmospheric perturbation. The microprocessor triggers the alarm when the width of the output pulses (S4) of the comparator is greater than a predetermined critical reference and the frequency F of said analog electric signal ranges between two predetermined values F1 and F2.

Dispositif destiné à fournir un signal d'alarme lors de la détection d'une onde gravitationnelle générée par la chute d'un corps dans une piscine utilisant un détecteur différentiel comportant des moyens de comparaison (20) pour comparer la valeur de seuil de sensibilité à la valeur du signal électrique reçu et fournir un signal d'alarme lorsque le signal électrique reçu dépasse la valeur de seuil de sensibilité. Le signal électrique résultant des ondes captées est fourni à un comparateur (44) permet à un microprocesseur (38) programmé de fournir des impulsions de largeur variable (S3) à l'entrée du comparateur de façon à diminuer la sensibilité du dispositif lorsque le dispositif détecte une perturbation atmosphérique. Le microprocesseur déclenche l'alarme lorsque la largeur des impulsions de sortie (S4) du comparateur est plus grande qu'une référence critique prédéterminée et que la fréquence F dudit signal électrique analogique est comprise entre deux valeurs prédéterminées F1 et F2.

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