基于脉宽反窄的水池安全警报传感器设计

为了减少无人看守的水池或游泳池中小孩的溺死事件,提出了一种基于脉宽反窄的水池警报传感器设计方法。采用刚性塑料圆管、水池面、压电陶瓷等元件构成密封探头模型,简化了传统水听器探头的设计;通过采用差分仪器放大器,减少了因振动等因素对测量造成的影响;采用程控放大器,增加了传感器的适用范围;采用脉宽反窄滤波器,提高了报警的准确性,减少了误报警率。实验结果表明,传感器具有很强的适用性,且报警的准确性达到99%以上。

Design for Pool Alarm Sensor Based on Pulse-width Anti-narrow

In order to reduce child drowning in the unattended ponds or swimming pools, a design method of a pool alarm sensor based on pulse-width anti-narrow is proposed. The design of hydrophone probe is simplified by making the sealed probe model up of rigid plastic pipe, pond surface, piezoelectric ceramic and other elements. The influence on measurement accuracy caused by many factors such as vibration is weakened through adopting the differential equipment amplifier. The application scope of sensor is widened by using programmable amplifier. The alarm accuracy is increased and the miss rate is decreased because of adopting pulse-width anti-narrow filter. The experimental results indicate that the sensor has a good applicability and the accuracy of alarm is over 99%.