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tech:cloud_sensor [2009/09/16 12:32] wildi |
tech:cloud_sensor [2010/03/28 16:01] (current) kaklik |
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| production devices. As of January 2009, there are 3 units known to be under operation. Furthermore, the second prototype - MM-2, is still operational as well. | production devices. As of January 2009, there are 3 units known to be under operation. Furthermore, the second prototype - MM-2, is still operational as well. | ||
| - | In the simplest way, this phenomenon was used in the first prototype of Mramomer - MM-1. It uses the Peltier | + | In the simplest way, this phenomenon was used in the first prototype of Mrakoměr - MM-1. It uses the Peltier |
| 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. | ||
| {{:tech:mrakomer3.jpg?200 |The first production sample of MM-3 after a tough night at BOOTES-IR, Sierra Nevada, Spain}} | {{:tech:mrakomer3.jpg?200 |The first production sample of MM-3 after a tough night at BOOTES-IR, Sierra Nevada, Spain}} | ||
| - | Further variants of the device use a less straightfordard, but equally effective way of detecting the clouds - measuring the effective temperature of the sky with a solid-state thermopile infrared sensor. Second prototype - MM-2 is a moveable device, able to provide effective temperatures at various inclinacions. The production devices - MM-3 and MM-4, are fixed for simplicity, providing only the temperature in the zenith. MM-4 has, in comparison to MM-3 improved circuitry to provide fault-tolerancy against failure of the sensor, crash of the computer, and burning from lightning. | + | Further variants of the device use a less straightforward, but equally effective way of detecting the clouds - measuring the effective temperature of the sky with a solid-state thermopile infrared sensor. Second prototype - MM-2 is a movable device, able to provide effective temperatures at various inclinations. The production devices - MM-3 and MM-4, are fixed for simplicity, providing only the temperature in the zenith. MM-4 has, in comparison to MM-3 improved circuitry to provide fault-tolerancy against failure of the sensor, crash of the computer, and burning from lightning. |
| Software support for Mrakoměr is natively in RTS-2 as a standalone device driver //rts2-sensord-mrakomer// and provides "BAD_WEATHER" signal in case that the readings suggest an overcast situation. | Software support for Mrakoměr is natively in RTS-2 as a standalone device driver //rts2-sensord-mrakomer// and provides "BAD_WEATHER" signal in case that the readings suggest an overcast situation. | ||
| More about mrakoměr can be found here: [[http://www.mlab.cz/]], | More about mrakoměr can be found here: [[http://www.mlab.cz/]], | ||
| - | description of MM-3 is here: [[http://www.mlab.cz/Designs/MRAKOMER3/DOC/description.pdf]] | + | description of MM-3 is here: [[http://www.mlab.cz/Designs/MRAKOMER3/DOC/description.pdf]] similarly MM-4 [[http://www.mlab.cz/Designs/MRAKOMER4/DOC/Mrakomer.en.pdf|http://www.mlab.cz/Designs/MRAKOMER4/DOC/Mrakomer.en.pdf]]. MM-4 is sell by [[http://www.ust.cz/shop/product_info.php?currency=EUR&cPath=2&products_id=59&language=en&osCsid=f994196e45e053f07235a3b47e66ae94|UST]]. |
| ===== LUNATICO AAGCV3 ===== | ===== LUNATICO AAGCV3 ===== | ||