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Encyclopedia > Ceilometer
Laser Ceilometer

A ceilometer is a device that uses a laser or other light source to determine the height of a cloud base. Ceilometers can also be used to measure the aerosol concentration within the atmosphere such as particulate matter. Image File history File links Ceilometer. ... Image File history File links Ceilometer. ... For other uses, see Laser (disambiguation). ... This article refers to meterology, for the airborne base of Captain Scarlet see Cloudbase. ...


Optical Drum Ceilometer

  • An optical drum ceilometer uses triangulation to determine the height of a spot of light projected onto the base of the cloud. It consists essentially of a rotating projector, a detector, and a recorder. The projector emits an intense beam of light above into the sky at an angle that varies with the rotation. The detector, which is located at a fixed distance from the projector, uses a photoelectric cell pointing vertically. When it detects the projected light return from the cloud base, the instrument note the angle and the calculation gives the height of clouds.

Triangulation can be used to find the distance from the shore to the ship. ... For other uses, see Cloud (disambiguation). ... A solar cell, a form of photovoltaic cell, is a device that uses the photoelectric effect to generate electricity from light, thus generating solar power (energy). ...

Laser Ceilometer

  • A laser ceilometer consist of a vertically pointing laser and a receiver in the same location. It determines the height by measuring the time (δt) required for a pulse of light to be scattered back from aerosols within the atmosphere.
where c is the light speed in the air.

Generally, the size of the particles in question are similar in size to the wavelength of the laser. This situation leads to MIE theory. Mie theory, also called Lorenz-Mie theory or Lorenz-Mie-Debye theory, is a complete analytical solution of Maxwells equations for the scattering of electromagnetic radiation by spherical particles (also called Mie scattering). ...


For cloud base determination purpose, due to the ceilometers ability to pick up any particle in the air (dust, precipitation, smoke, etc...), it will give occasional false readings. As an example, depending on the threshold used, falling Diamond dust (Ice Crystals) may cause the ceilometer to report a cloud height of zero, even though the sky is clear. Diamond dust is the name commonly used to refer to a ground-level cloud composed of tiny ice crystals. ...


Using these last properties, ceilometers will have other uses. Since the instrument will note any returns, it is possible to locate any faint layer where it occurs, additionally to the cloud's base, by looking at the whole pattern of returned energy. Furthermore, the rate at which diffusion happens can be noted by the diminishing part returned to the ceilometer in clear air, giving the coefficient of extinction of the light signal. Using these data could give the vertical visibility and the possible concentration of air pollutants. This has been developed in research and could be applied for operational purpose. Air pollution Pollution is the introduction of pollutants (whether chemical substances, or energy such as noise, heat, or light) into the environment to such a point that its effects become harmful to human health, other living organisms, or the environment. ...


External links

Wikimedia Commons has media related to:
McGill University is a public co-educational research university located in Montréal, Québec, Canada. ... A hemispherical cup anemometer of the type invented in 2000 by John Thomas Romney Robinson An anemometer is a device for measuring the velocity or the pressure of the wind, and is one instrument used in a weather station. ... A barograph is a recording aneroid barometer. ... A barometer is an instrument used to measure atmospheric pressure. ... A ceiling balloon cabinet A fully inflated ceiling balloon Diagram of a filler stand Regulator valve and pressure guages attached to helium cylinder A ceiling balloon is used by meteorologists to determine the height of the base of clouds above ground level during daylight hours. ... Ceiling projector exterior Interior of a ceiling projector Alidade for use with a ceiling projector The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. ... Dark adaptor goggles The Dark adaptor goggles are one of the lesser known tools in the field of meteorology. ... A disdrometer is an instrument used to measure the drop size distribution and velocity of falling precipitation. ... Field mill is a specialized instrument used for measuring the strength of electrical fields in the atmosphere near thunderstrom clouds. ... The interior of a Stevenson screen showing a motorized psychrometer Hygrometers are instruments used for measuring humidity. ... Standard Ice Accretion Indicator (upside down) The Ice Accretion Indicator is an L-shaped piece of aluminium 38 cm (14. ... A FASOR used at the Starfire Optical Range for LIDAR and laser guide star experiments is tuned to the sodium D2a line and used to excite sodium atoms in the upper atmosphere. ... Lightning detector at the Kennedy Space Center in Florida. ... A nephelometer is an instrument for measuring suspended particulates in a liquid. ... Nephoscope is instrument for measuring the altitude, direction, and velocity of movement of clouds. ... A pyranometer is a type of actinometer used to measure broadband solar irradiance on a planar surface. ... radiosonde with measuring instruments A radiosonde (Sonde is German for probe) is a unit for use in weather balloons that measures various atmospheric parameters and transmits them to a fixed receiver. ... Standard Rain Gauge Tipping Bucket Rain Gauge Recorder Close up of a Tipping Bucket Rain Gauge Recorder chart A rain gauge (also known as an udometer or a pluviometer[fluviograph] or a cup) is a type of instrument used by meteorologists and hydrologists to gather and measure the amount of... Snow Gauge A snow gauge is a meteorological instrument used to record the depth of snowfall at a specific location. ... SODAR (sonic detection and ranging) - meteorological instrument which priciple of operation is based on sound waves scattering by atmosheric turbulence. ... A solarimeter is a pyranometer used to measure combined direct and diffuse solar radiation. ... A sounding rocket, sometimes called an elevator research rocket, is an instrument-carrying suborbital rocket designed to take measurements and perform scientific experiments during its flight. ... Exterior of a Stevenson screen Interior of a Stevenson screen A Stevenson screen or Instrument shelter is a meteorological screen to shield instruments against precipitation and direct heat radiation from outside sources, while still allowing air to circulate freely around them. ... Sunshine Recorders are used to indicate the amount of sunshine at a given location. ... A thermograph is a recording thermometer. ... A clinical mercury thermometer A thermometer is a device that measures temperature or temperature gradient, using a variety of different principles. ... Rawinsonde weather balloon just after launch. ... Weather radar in Norman, Oklahoma with rainshaft (Source: NOAA) Environment Canada King City (CWKR) weather radar station. ... Weather vane Weather cock Aerovane A weather vane, also called a wind vane, is a movable device attached to an elevated object such as a roof for showing the direction of the wind. ... A windsock is a large, conical, open-ended tube designed to indicate wind direction and relative wind speed. ... A wind profiler is a piece of weather observing equipment that uses sound waves to detect the wind speed and direction at various elevations above the ground. ...

  Results from FactBites:
 
Chilbolton Observatory (105 words)
Scientists use the ceilometer to measure the sizes of precipitation particle and to discover whether a cloud colder than zero degrees is made up of ice or water.
The latest results from the ceilometer can be found on the Chilbolton Weather Web.
To see measurements taken with the IR lidar ceilometer look in the research section of the site.
  More results at FactBites »

 
 

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