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Optical smoke alarm - top
An optical (photoelectric) smoke detector. The smoke detecting chamber is the black cylinder on the right. The green disc is a piezoelectric transducer that makes the shrill noise you can hear.
This is from our article about how smoke detectors work.
Our images are published under a Creative Commons Licence (see opposite) and are free for noncommercial use. We also license our images for commercial use. Please contact us directly via our website for more details.
Optical smoke alarm - top
An optical (photoelectric) smoke detector. The smoke detecting chamber is the black cylinder on the right. The green disc is a piezoelectric transducer that makes the shrill noise you can hear.
This is from our article about how smoke detectors work.
Our images are published under a Creative Commons Licence (see opposite) and are free for noncommercial use. We also license our images for commercial use. Please contact us directly via our website for more details.