Re: [Paparazzi-devel] Doubt Regarding IR

[Tilman Baumann]

The plot does not show voltage per angle but rather relative
responsitivity per angle.
So what you are seeing here is that you have high 'resolution' (delta
voltage per delta degree) around zero degree and little towards 90
degrees.

If you would plot voltage vs angle you would probably get hysteresis like
courve. Not sure about that, but that seems to make sense to me.

Not sure if I'm BSing here. But this is how it made sense to me.

Arun Sajeevan wrote:
> Thank you Martin,
> But that did not answer my query. I just need an explanation about the
> plot.What are the parameters and how they vary accordingly? I hope my
> query
> is clear?
> Regards,
> Arun
>
> On Fri, Aug 27, 2010 at 12:35 PM, Martin Mueller <address@hidden> wrote:
>
>> Hi Arun,
>>
>> it is not linear, see estimator_update_state_infrared() in
>> sw/airborne/infrared.c for the conversion.
>>
>> Martin
>>
>>
>> On 27.08.2010 09:02, Arun Sajeevan wrote:
>>
>>> Hi All,
>>> I had a doubt regarding the working principle of the IR sensors.
>>> With reference to the "Theory Of operation" mentioned in our Wiki
>>> pages,
>>> it is said that : *the sensors typically have a 100 degree field of
>>> view
>>> and produce a somewhat sinusoidal voltage response relative to their
>>> angle orientation. as seen in the plot to the right.*But we are not
>>> able
>>> to understand the plot shown.
>>> It had  been earlier mentioned that the IR voltage is proportional to
>>> the
>>> :
>>>
>>>    * The angle of the aircraft
>>>    * The local ground/sky temperature difference
>>>
>>> But the plot does not seem to follow this.Can someone please explain
>>> this? The link for the plot
>>> :http://paparazzi.enac.fr/wiki/Image:Ir_response_curve.gif
>>> Thanks for your time.
>>> Regards
>>> Arun
>>>
>>>
>>>
>>> _______________________________________________
>>> Paparazzi-devel mailing list
>>> address@hidden
>>> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>>>
>>
>>
>> _______________________________________________
>> Paparazzi-devel mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>>
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>