tech:cloud_sensor
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tech:cloud_sensor [2009/01/27 18:51] – mates | tech:cloud_sensor [2011/05/17 11:44] – [MRAKOMĚR] kaklik | ||
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Because of an importance to protect the astronomical equipment against rain, masurement of the cloud cover is an important part of a decision scheme of an independent robotic observatory. It allows the system to detect the presence of a cloud cover, and up to some extent, supplement the information of observing conditions when the clouds are absent. | Because of an importance to protect the astronomical equipment against rain, masurement of the cloud cover is an important part of a decision scheme of an independent robotic observatory. It allows the system to detect the presence of a cloud cover, and up to some extent, supplement the information of observing conditions when the clouds are absent. | ||
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The basic principle of a cloudmeter is the fact, that the Earth surface tends to establish radiative equilibrium with anything above it - if overcast, there is a radiative equilibrium between the Earth | The basic principle of a cloudmeter is the fact, that the Earth surface tends to establish radiative equilibrium with anything above it - if overcast, there is a radiative equilibrium between the Earth | ||
surface and its cloud cover. On the other hand, when the clouds are not present, this condition disappears and the surface radiates into the universe. (Or tries to establish the equilibrium with the cosmic microwave background :-) ) | surface and its cloud cover. On the other hand, when the clouds are not present, this condition disappears and the surface radiates into the universe. (Or tries to establish the equilibrium with the cosmic microwave background :-) ) | ||
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+ | Of course, this principle works only in nighttime. During the day, Sun provides additional source of radiation and although the signal still can be used, it's interpretation is not straightforward. | ||
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+ | =====MRAKOMĚR===== | ||
{{ : | {{ : | ||
- | In the simplest way, this phenomenon was used in the first prototype of Mramomer | + | Mrakoměr [[wp> |
+ | production devices. As of January 2009, there are 3 units known to be under operation. Furthermore, | ||
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+ | In the simplest way, this phenomenon was used in the first prototype of Mrakoměr | ||
cell inserted freely between the earth and the sky. The current generated by the cell is nonzero, and differs significantly when the clouds are present or absent. | cell inserted freely between the earth and the sky. The current generated by the cell is nonzero, and differs significantly when the clouds are present or absent. | ||
- | Further variants of the device | + | {{: |
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+ | Further variants of the device | ||
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+ | Software support for Mrakoměr is natively in RTS-2 as a standalone device driver // | ||
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+ | More about mrakoměr can be found here: [[http:// | ||
+ | description of MM-3 is here: [[http:// | ||
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+ | ===== LUNATICO AAGCV3 ===== | ||
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+ | {{ : | ||
- | Clouds reflect IR radiation. Lower the reflected radiation = less clouds. If you can measure it, you can estimate | + | There is a commercial device, designed by [[http:// |
- | More information can be obtained here: [[http://www.mlab.cz/Designs/MRAKOMER3/ | + | See < |
tech/cloud_sensor.txt · Last modified: 2011/05/17 00:00 (external edit)