| 摘要 |
PURPOSE: A portable fire sensing apparatus is provided, which is strong against the noise because of its simple configuration and can reduce the possibility of wrong operation. CONSTITUTION: A semiconductor type sensor(510) senses the fire flame. An amplifying end(520) amplifies the output of sensor. A comparator(540) compares the output size of said amplifying end. A controller(530) offers the PWM(Pulse Width Modulation) input to the sensor and receives the PWM signal outputted from the sensor. If number of pulses of the outputted PWM signal and the PWM input offered to the sensor are the same, the Controller generates a fire warning signal. |
