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TABLE 34-1 IC1 R1, R3 R2 Q1 Misc.
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Parts List for Flame Detector LM339 quad comparator IC 10K resistor 10K potentiometer Infrared-sensitive phototransistor Infrared filter for phototransistor (if needed)
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34.2 USING A PYROELECTRIC SENSOR TO DETECT FIRE
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Test the circuit by connecting an LED and 270- resistor from the Vout terminal to ground. Point the sensor at a wall, and note the condition of the LED. Now, wave a match in front of the phototransistor. The LED should blink on and off. You ll notice that the circuit is sensitive to all sources of infrared light, which includes the sun, strong photolamps, and electric burners. If the circuit doesn t seem to be working quite right, look for hidden sources of infrared light. With the resistor values shown, the circuit is fairly sensitive; you can change them by adjusting the value of R1 and R2.
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34.1.2 WATCHING FOR THE FLICKER OF FIRE
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No doubt you ve watched a fire at the beach or in a fireplace and noted that the flame changes color depending on the material being burned. Some materials burn yellow or orange, while others burn green or blue (indeed, this is how those specialty fireplace logs burn in different colors). Just like the color signature given off when different materials burn, the flames of the fire flicker at different but predictable rates. You can use this so-called flame modulation in a robot fire detection system to determine what is a real fire and what is likely just sunlight streaming through a window or light from a nearby incandescent lamp. By detecting the rate of flicker from a fire and referencing it against known values, it is possible to greatly reduce false alarms. The technique is beyond the scope of this book, but you could design a simple flame-flicker system using an op amp, a fast analog-to-digital converter, and a computer or microcontroller. The analog-to-digital converter would translate the instantaneous brightness changes of the fire into digital signals. The patterns made by those signals could then be referenced against those made by known sources of fire. The closer the patterns match, the greater the likelihood that there is a real fire. In a commercial product of this nature, it is more likely that the device would use more sophisticated digital signal processing.
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34.2 Using a Pyroelectric Sensor to Detect Fire
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A pyroelectric sensor is sensitive to the infrared radiation emitted by most fires. The most common use of pyroelectric infrared (or PIR) sensors is in burglar alarms and motion detectors. The sensor detects the change in ambient infrared radiation as a person (or animal or other heat-generating object) moves within the field of view of the sensor. The key ingredient here is change: a PIR sensor cannot detect heat per se but the changes in the heat within its field of view. In larger fires, the flickering flames create enough of a change to trigger the PIR detector. 30, Object Detection, discusses how to use PIR sensors to detect the motion of people and animals around a robot. The same sensor, with little or no change, can be employed to detect fires. To be effective as a firefighter, you should ideally reduce the sensor s field of view so the robot can detect smaller fires. The larger the field of view, the more the temperature and/or position of the heat source must change in order for the PIR sensor to detect it.
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FIRE DETECTION SYSTEMS
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With a smaller field of view, the magnitude of change can be lower. However, with a small field of view, your robot will likely need to sweep the room, using a servo or stepper motor, in order to observe any possible fires. The sweeping must stop periodically so the robot can take a room reading. Otherwise, the motion of the sensor could trigger false alarms.
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