Difference between revisions of "Infrared Sensors"

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[[Image:favicon32.png|32px]] Infrared Sensors
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<gallery>
Image:Ir_dual.jpg|IRH early design
Image:Ir_sensor_single_rotated.jpg|IRV early design
Image:Irsensors.jpg|New smaller and slimmer Paparazzi IRH and IRV sensor boards
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See also [[Paparazzi_Infrared_Sensors]] for hardware.
 
== Infrared Stabilization Principle ==
The paparazzi autopilot uses infrared thermopiles for primary attitude sensing.  The theory is that at zero bank or pitch angle, the difference in the heat between the two sensors should be zero, and at 90 degrees it should be maximum.  From this relationship a linear regression is made and angles are calculated during flight.
 
[[Image:Infrared_Stabilisation_Principle_tilted.png|400px|Two axis infrared attitude measurement]]
 
Each pair of sensors measures one axis, a minimum of 2 pairs must be used to measure pitch and roll but best results are obtained thru the use of a 3<sup>rd</sup> pair on the vertical axis.  Since the output signal from each sensor pair is proportional to both the attitude and the weather/terrain, systems with only x-y sensors require a ground calibration and may not provide accurate angle calculations as the aircraft travels over terrain with different IR radiation.
 
[[Image:Infrared_Stabilisation_Principle_tilted_with_Z.png|400px|Three axis infrared attitude measurement]]
 
== Hardware Architecture ==
 
=== Horizontal Board ===
 
[[Image:IR_Sensor_Board_Architecture_dual.jpg]]
 
=== Vertical Board ===
 
[[Image:IR_Sensor_Board_Architecture_single.jpg]]
 
 
== Thermopiles ==
 
The Thermopiles are:
 
* Manufacturer Part Number: MLX90247-ESF-DSA ([http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MLX90247ESF-DSA-ND Digi-Key])
* Description: IC SENS THERMOPILE W/THERM TO-39
* [http://www.melexis.com/Asset/IR-Sensor-MLX90247-DataSheet-DownloadLink-4763.aspx data sheet] (Melexis site)
 
[[Category:Hardware]] [[Category:User_Documentation]]

Latest revision as of 02:41, 18 December 2011

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