Photo-diodes.
Photo-diodes.
i think they operate with solenoids (light detectors).
i think they operate with solenoids (light detectors).
Smoke Detectors use things called LDR's or Light Dependent Resistors which lose resistance with an increase in natural light. So when there is a fire, smoke blocks out the natural light, alarming the smoke detector with an increase in resistance. Once the smoke is gone the resistance decreases and a current is allowed to flow to shut down the smoke detectors alarm. :)
HPLC UV detectors measure absorbance of UV light at a specific wavelength, while fluorescence detectors measure the emission of light at a longer wavelength after excitation with UV light. Fluorescence detectors are more sensitive and selective than UV detectors, but may require additional steps such as derivatization for certain compounds.
Photoelectric smoke detectors use a light beam to detect smoke particles, while ionization smoke detectors use radioactive particles to detect smoke. Photoelectric detectors are better at detecting smoldering fires, while ionization detectors are more sensitive to fast-flaming fires.
Detectors of visible light waves include photodiodes, photomultiplier tubes, and charge-coupled devices (CCDs). These detectors work by converting incoming photons into an electrical signal that can be measured and analyzed. They are commonly used in cameras, sensors, and scientific instruments to detect and capture images or quantify light intensity.
Ionization smoke detectors use a small amount of radioactive material to ionize the air, while photoelectric smoke detectors use a light beam to detect smoke particles. Ionization detectors are better at detecting fast-flaming fires, while photoelectric detectors are more sensitive to slow-smoldering fires.
Infrared detectors are commonly used to detect wavelengths in the infrared range of the electromagnetic spectrum. They can be made using various technologies, such as thermopiles, pyroelectric detectors, and semiconductor-based detectors like InSb or HgCdTe detectors. These detectors convert infrared radiation into an electrical signal that can be analyzed or used for various applications.
A now bankrupt company called SK Global America makes the Early Warning detectors.
Yes they do dell called your mum's face
There are several types of leak detectors used in HVAC systems, including electronic leak detectors, ultrasonic leak detectors, and dye-based leak detectors. Electronic detectors sense refrigerant gases through sensors, while ultrasonic detectors pick up sound waves generated by leaks. Dye-based detectors involve adding a fluorescent dye to the refrigerant, which can be visually inspected under UV light. Each type has its advantages, depending on the specific needs of the HVAC system and the type of refrigerant used.