Infrared IR detectors are widely used to monitor industrial facilities for the presence of flames, ensuring that the risk of an outbreak of fire is minimised. A flame will flicker randomly at a rate between 1-20Hz when it is burned naturally, modulating any IR signal generated. Pyroelectric and lead sulphide detectors sense this modulated IR light and so can provide a warning of the presence of a flame. The signal to noise characteristic of the IR sensor determines the range and sensitivity of the flame detection instrument.
Since its founding in 1982, LASER COMPONENTS has specialised in IR sensors for use in flame detection devices. The company manufactures lead sulphide detectors at its assembly plant in Arizona and pyroelectric detectors in Florida.
The PB25 PbS detector is a cost effective sensor for this application and generates a response to the presence of a flame in 30mS at ranges out to 65m.
The recent addition of a differential pyroelectric detector to the company's portfolio of sensors provides flame detection appliance manufacturers with an innovative sensor with even higher levels of signal to noise and immunity to electromagnetic interference.