Is the pair of electrodes and the air between them.ġ-5. The transducer in this type of smoke detector When smoke enters the space between the electrodes, the conductivity of the ionized airĬhanges, which causes the alarm to sound. Small radioactive source (usually Americium) ionizes the air between a pair of electrodes. In ionization detectors, which are the typical battery-powered detectors found in homes, a In this case the photodiode is the transducer. When smoke enters the space between the LED and the photodiode, the photocurrentĭecreases, which sets off an alarm. Photodiode to produce a current proportional to the intensity of light from the LED.
Photodetectors consist of a light source, such as a light-emitting diode (LED) and a Smoke detectors are of two types: photodetectors and ionization detectors. The detector in a spectrograph is a photographic film or plate.ġ-4. The information processor in a visual color measuring system is the human brain.ġ-3. Information into a current, voltage, or charge, and the most common output transducersĬonvert electrical signals into some numerical form.ġ-2. The most common input transducers convert chemical or physical A transducer is a device that converts chemical or physical information into an electrical
