instruments:scintillometer:scintillometer
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instruments:scintillometer:scintillometer [2011/03/22 09:51] – sonja | instruments:scintillometer:scintillometer [2021/01/22 22:17] (current) – external edit 127.0.0.1 | ||
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====== Scintillometer ====== | ====== Scintillometer ====== | ||
- | //Mentors: R. Haseneder-Lind, | + | |
+ | // | ||
===== Principle ===== | ===== Principle ===== | ||
- | The Large Aperture Scintillometer (LAS) is a instrument designed for measuring the path-averaged structure parameter of the refractive index of air (Cn^2) over horizontal path lengths from 250m to 4,5km. Structure parameter measurements obtained with the LAS and standart meteorological observations (air temperature, | + | The Large Aperture Scintillometer (LAS) is an instrument designed for measuring the path-averaged structure parameter of the refractive index of air (Cn^2) over horizontal path lengths from 250m to 4,5km. Structure parameter measurements obtained with the LAS and standart meteorological observations (air temperature, |
The LAS optically measure intensity fluctuations (known as scintillations) using a transmitter and receiver horizontally separated by several kilometers. The scintillations seen by the instrument can be expressed as the structure parameter of the refractive index of air(Cn^2). The light source of the LAS transmitter operates at a near-infrared wavelength of 880nm. At this wavelength the observed scintillations are primarily caused by turbulent temperature fluctuations. Therefore Cn^2 measurements obtained with the LAS can be related the sensible heat flux. | The LAS optically measure intensity fluctuations (known as scintillations) using a transmitter and receiver horizontally separated by several kilometers. The scintillations seen by the instrument can be expressed as the structure parameter of the refractive index of air(Cn^2). The light source of the LAS transmitter operates at a near-infrared wavelength of 880nm. At this wavelength the observed scintillations are primarily caused by turbulent temperature fluctuations. Therefore Cn^2 measurements obtained with the LAS can be related the sensible heat flux. | ||
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===== Instrument ===== | ===== Instrument ===== | ||
{{: | {{: | ||
- | Current | + | Test setup in Cologne: Scintillometer (receiver) on the roof of IGM-Cologne. |
===== History ===== | ===== History ===== | ||
^ Period | ^ Period | ||
- | | 23.03.10 - today | [[http:// | + | | 23.03.10 - 19.9.2013 |
===== Data ===== | ===== Data ===== | ||
+ | |||
+ | The instrument is currently inactive. | ||
+ | |||
+ | [[http:// | ||
+ | |||
+ | ===== Specifications ===== | ||
+ | ^ Parameter | ||
+ | | Operating temperature | -20° to 50°C | | ||
+ | | Humidity | 0 - 100% RH (IP66) | | ||
+ | | Voltage | 12 VDC nominal (10.5V to 15V) | | ||
+ | | Power | 0.5 A max ( path length dependant ) 3 A with heater | | ||
+ | | Optical Wavelength of LED | 880 nm spectral bandwidth at 50% ~ 80nm | | ||
+ | | Modulation frequency | ~7kHz | | ||
+ | | Beam width | ~1 m at 100 m distance | | ||
+ | | Physical dimensions (including pan and tilt adjusment) || | ||
+ | | Length | 0.37 m | | ||
+ | | Width | 0.23 m | | ||
+ | | Height | 0.32 m | | ||
+ | | Weight | 13.5 kg | | ||
+ | |||
+ |
instruments/scintillometer/scintillometer.1300783874.txt.gz · Last modified: 2016/04/07 19:53 (external edit)