instruments:scintillometer:scintillometer
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instruments:scintillometer:scintillometer [2011/09/09 09:20] – rainer | instruments:scintillometer:scintillometer [2016/04/06 15:17] – rainer | ||
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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 ===== | ||
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| Modulation frequency | ~7kHz | | | Modulation frequency | ~7kHz | | ||
| Beam width | ~1 m at 100 m distance | | | Beam width | ~1 m at 100 m distance | | ||
- | ^ Physical dimensions (including pan and tilt adjusment) | + | | Physical dimensions (including pan and tilt adjusment) |
| Length | 0.37 m | | | Length | 0.37 m | | ||
| Width | 0.23 m | | | Width | 0.23 m | |
instruments/scintillometer/scintillometer.txt · Last modified: 2021/01/22 22:17 by 127.0.0.1