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What is optical smoke detector?

Updated: 9/26/2023
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Q: What is optical smoke detector?
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What is a smoke alarm made out of?

Most smoke detectors work either by optical detection (photoelectric) or by physical process (ionization), while others use both detection methods to increase sensitivity to smoke. For the alarm part, in many single family detached and smaller multiple family housings, a smoke alarm is often powered only by a single disposable battery. An optical detector is a light sensor. When used as a smoke detector, it includes a light source (incandescent bulb or infrared LED), a lens to collimate the light into a beam, and a photodiode or other photoelectric sensor at an angle to the beam as a light detector. In the absence of smoke, the light passes in front of the detector in a straight line. When smoke enters the optical chamber across the path of the light beam, some light is scattered by the smoke particles, directing it at the sensor and thus triggering the alarm. An ionizing detector type of detector is cheaper than the optical detector; however, it is sometimes rejected because it is more prone to false alarms than photoelectric smoke detectors. It can detect particles of smoke that are too small to be visible. It includes about 37 kBq or 1 µCi of radioactive americium 241, corresponding to about 0.3 µg of the isotope. The radiation passes through an ionization chamber, an air-filled space between two electrodes, and permits a small, constant current between the electrodes. Any smoke that enters the chamber absorbs the alpha particles, which reduces the ionization and interrupts this current, setting off the alarm. From Wikipedia.


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What is the function of detector in UV spectrophotometer?

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Can a smoke detector sound from heat only?

Then it wouldn't be a smoke detector, but there are fire alarms that are triggered by temperature.


Do I need a battery smoke detector as a backup?

If your home smoke detector is tied into your electricity and is equipped with a battery backup you should not need an additional smoke detector. You should insure that the batteries are charged and that the smoke detector is functioning properly at least once a month if not more often.


How do you unplug a smoke detector?

Remove the batteries from the back of the detector.


How does a radioactive smoke detector?

Americium-241 ionizes the air inside a smoke detector, making a small change in voltage when smoke is present.


Why does your smoke detector beep only at night?

Incase you are sleep and a fire starts the smoke detector will wake you up