IR sensor calibration

Hi all,We are using the thermopile sensors to estimate attitude of our airplane. The problem is that the paparazzi wiki mentions a nonlinear relationship between the angle and the voltage. Therefore, we can't use it unless we calibrate it experimentally and find the values for different angles and store them in a table. However, that would be cumbersome. It would help greatly if there was a mathematical relation or a lookup table between the voltage and angle, but so far we haven't been able to find it. Any ideas on this?-yogesh, aravind

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yogesh May 3, 2009 at 9:50am

@ Cory,

Thanks ... will send you a pm and make this forum topic.
Cory May 3, 2009 at 9:42am

I would suggest that you look at the paparazzi source code, I was able to tease out the equations that they use to estimate attitude from the IR sensor information. I don't remember which file you need to look at off the top of my head (estimator.h maybe?). I have the file with the equations on my other machine, but if you pm me with your email address, I can send you that information (it may take a few days since I will be traveling all week).

BTW, this seems more a forum topic than blog topic.

Cory

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