Ceilometer

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OBJECT TYPE
gallium arsenide injection laser
DATE
1987
ARTIFACT NUMBER
2004.0313.001
MANUFACTURER
ASEA
MODEL
QL1212
LOCATION
Sweden

More Information


General Information

Serial #
7393-798
Part Number
1
Total Parts
2
AKA
N/A
Patents
N/A
General Description
synthetic casing/ synthetic hose, cord, parts/ metal parts, hardware

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
52.0 cm
Width
44.0 cm
Height
136.0 cm
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Meteorology
Category
Cloud height & motion measurement
Sub-Category
N/A

Manufacturer

AKA
ASEA
Country
Sweden
State/Province
Unknown
City
Unknown

Context

Country
Canada
State/Province
Ontario
Period
Unknown
Canada
Part of a large collection of meteorological instruments acquired from the Meteorological Service of Canada (previously Atmospheric Environment Service) by the CSTM since 1967. MSC is the government agency responsible for collecting and disseminating meteorological data and forecasts in Canada. It was founded in 1871 in Toronto where it is still headquartered. The MSC was originally on the University of Toronto downtown campus but moved to Downsview in 1971 on land owned by UofT. The headquarters houses laboratories, research facilities and calibration and instrument maintenance facilities (now largely contracted out).
Function
A ceilometer is an automatic, active, remote-sensing instrument for detecting the presence of clouds overhead and measuring the height of their bases. It was used at meteorological stations and airports to continuously measure cloud height above the ground and indicate that reading on a display unit. The instrument measures two different cloud bases, up to a height of 3000 metres. If the vertical visibility is less than 500 metres and the unit cannot detect a cloud base, then the vertical visibility is indicated instead.
Technical
An example of a ceilometer based on optical radar or LIDAR. LIDAR (Light Detection and Rangefinding) is an optical remote sensing technology involving instruments that track atmospheric activity, such as cloud formations, by aiming a powerful infrared pulse at the object and measuring the reflection and scattering (Ref. 3). This ceilometer emits short laser light pulses and the time taken for them to be reflected from the cloud base and arrive back is measured. Using the speed of light, the ceilometer calculates basic cloud height. For optically thin clouds, such as most cirrus, more than one layer may be detected, but when optically thick clouds, such as liquid water stratus, are present, the light beam is unlikely to penetrate much beyond the base of the lowest liquid layer. Laser ceilometers use intense pulses of light in a very narrowly collimated, vertically directed beam, and have collocated transmitter and receiver systems. The cloud base heights may be displayed in a variety of time-height section images or backscatter intensity profile plots. Some older ceilometers use separated transmitter and receiver units. The instruments are designed to work during the day or night. The ASEA ceilometer consists of three basic units: a transceiver, a control unit with a detachable visible display and a recorder. A number of control units may be connected to the transceiver, each with a digital display and recorder, in order to display the measurement results at several locations,. Alternately, the transceiver can be connected to an external data collection system. The outdoor transceiver unit contains the transmitter, receiver, their respective lenses and the electronic and signalling components. The optical and electronic components are in a hermetically sealed casing with two sloping windows at the top for the optical systems of the transmitter and receiver. An open topped cover protects the instrument from sun, wind and snow. The unit also contains a blower to clean the casing windows and heating elements (Refs. 1-2) ASEA was founded in 1889 in Sweden and in 1988 merged with BBC Brown Boveri (Ref. 4)
Area Notes
Unknown

Details

Markings
exterior label in English and French reads 'ASEA/ CAUTION/ INVISIBLE LASER RADIATION/ DO NOT STARE INTO BEAM/ OR VIEW DIRECTLY WITH/ OPTICAL INSTRUMENTS/ GALLIUM ARSENIDE/ INJECTION LASER' and 'ATTENTION/ RAYONNEMENT LASER INVISIBLE/ NE PAS REGARDER LE FAISCEAU/ NI OBSERVER DIRERECTEMENT A/ L'AIDE D'INSTRUMENTS OPTIQUES/ LASER A INJECTION/ A ARSENIURE DE GALLIUM'
Missing
three-legged stand for ceilometer
Finish
white synthetic casing with orange band/ metallic hardware/ black synthetic hose, cord, parts/ white synthetic parts
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

ASEA, Ceilometer, circa 1987, Artifact no. 2004.0313, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2004.0313.001/

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