An optical beam smoke detector is a device that uses a projected beam of light to detect smoke across large areas, typically as an indicator of fire....

auditoriums, optical beam or projected-beam smoke detectors are used instead of a chamber within the unit: a wall-mounted unit emits a beam of infrared...

it is called motion perception. An active electronic motion detector contains an optical, microwave, or acoustic sensor, as well as a transmitter. However...

"hotboxes" (overheating bearings) which would smoke or glow red. By the 1940s, automatic defect detectors included infrared sensors for hotboxes, wires...

pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in turn cause variations...

A gas detector is a device that detects the presence of gases in a volume of space, often as part of a safety system. A gas detector can sound an alarm...

An optical fiber, or optical fibre, is a flexible glass or plastic fiber that can transmit light from one end to the other. Such fibers find wide usage...

the concentration of smoke particles becomes higher. Optical obscuration. A light beam is passed through the smoke and a detector opposite measures the...

Long-range optical wireless communication or free-space optical communication (FSO) is an optical communication technology that uses light propagating...

Optical Express Optical amplifier Optical autocorrelation Optical beam dump Optical beam induced current Optical bistability Optical cavity Optical coherence...

communication (UVC) as a result of recent progress in solid-state optical sources/detectors operating within solar-blind UV spectrum (200–280 nm). In this...

by paper or flammable liquids. A newer type of the smoke detector is the photoelectric smoke detector. It contains a light source, which is positioned indirectly...

particulates by employing a light beam (source beam) and a light detector set to one side (often 90°) of the source beam. Particle density is then a function...

Colorimeter Contact image sensor Electro-optical sensor Flame detector Infra-red sensor Kinetic inductance detector LED as light sensor Light-addressable...

infra-red signature of the target would be too faint for an infra-red detector to track. There are three major types of radar-guided missile – active...

communication (UVC) as a result of recent progress in solid-state optical sources/detectors operating within solar-blind UV spectrum (200–280 nm). In this...

rangefinders. Then it alerts the crew and can start various countermeasures, like smoke screen, aerosol screen (e.g. Shtora), active laser self-defence weapon with...

Response time The response time is the time required for the detector to respond to an optical input. A photon absorbed by the semiconducting material will...

transparent again in the so-called infrared and optical window frequency ranges. In a microwave beam directed at an angle into the sky, a small amount...

studied. Optical coherence tomography uses Michelson interferometry with a distance adjustable mirror. Coherent light passes through a beam splitter where...

the detector set up to the side of the light beam. More light reaches the detector if there are many small particles scattering the source beam than...

points and automatic fire detectors according to different measuring principles (smoke detectors, heat detectors, fire gas detectors ...). Product group "other...

by the ratio detector. This is simple but very hard to align. The next is a relatively simple detector. This is the quadrature detector. It was invented...

Light-Emitting Diodes as Spectrally Selective Detectors, Applied Optics, 31, 33, 6965-6967, 1992. F. M. Mims III, Aerosol Optical Depth, Ultraviolet-B and Total Sky...

the 17800 detector range (consisting of the 17830 Ionisation Smoke Detector, 17840 Optical Smoke Detector, 17850 Fixed Rate Heat Detector, 17860 Rate...

Age Information revolution Optical communication Outline of telecommunication Tomkins, William (2005). "Native American Smoke Signals". "Talking Drums"...

receivers (each one consisting of three detectors), a control unit and eight smoke grenade dischargers. The detectors work in 360° azimuth and in an elevation...

of neutrons. For neutron detectors to be portable, they must be able to detect landmines efficiently with low-intensity beams so that little shielding...

photophone is a telecommunications device that allows transmission of speech on a beam of light. It was invented jointly by Alexander Graham Bell and his assistant...

frequency carrier wave. This is done by a circuit called a demodulator (detector). Each type of modulation requires a different type of demodulator an AM...