[Radiance-general] Three-Phase Method - subdivision of window with sensor located close to the window

[David Geisler-Moroder]

Hi Anne,

another thing that came to my mind...

You are calling rtcontrib for the VMX using rsensor in your script like
that:
    rsensor -h -rd 1000 -vf views/luxstat.vf sensors/WattStopper_LS-290C.dat
. |\
       rtcontrib -c 1000 -f klems_int.cal -bn Nkbins -fo -o
results/"$vmxname"_%s.vmx \
       -b kbinS -m windowlight -b kbinS -m windowlightsens \
       -I+ -ab 3 -ad 2000 -ds .15 -lw 1e-4 model_vmx.oct

Do you want to obtain the sensor signal split up into the Klems bins?
If yes, I'm not sure if it works like that...

You are using rsensor to generate 1000 rays (i.e. origin and direction)
according to the sensor-file.
These points and directions are then given to rtcontrib, where you use -c
1000 to accumulate all
1000 results and -I+ to switch to irradiances.
However, this means that rtcontrib calculates irradiances for 1000 pairs of
points and directions as
if it was e.g. a grid for illuminance calculations. So you do not obtain the
sensor signal, but a mean
of the 1000 calculated irradiances.

I hope I'm not missing anything...

Cheers,
David



2011/4/30 Anne Iversen <iversen.anne at gmail.com>

> Hi,
> Maybe I was a bit fast concluding that I'll use glow. Comparing the glow
> material to the light material reveals a lower sensor signal when the direct
> irradiation is low and the opposite when direct irradiation is high. Do you
> know why I get this? Due to the ‘subsampling’ problem of window lights as
> David mentioned because of my sensor location very close to the window?? And
> therefore I should stick to glow?
>
> I have included the results from the glow simulations in the document:
> http://dl.dropbox.com/u/9713279/ThreePhaseMethod_Subdivision.pdf
> (the non-readable legends and axes must be a mac thing...the same happens
> when I open the documet on my mac, I can read the graphs nicely in the pdf
> on my pc. ...have included some text in the captions, if you want to know
> what you are looking at ;-))
>
> And to your question about my sensor, Andy. The sensor is located on the
> window head, just behind the glass. The major detection area is to the
> outside through the window. The sensor used right now comes along with the
> SPOT distribution, and is the WattStopper LD290C - the spatial distribution
> can be seen from the image linked to below. I wouldn't call it a
> narrow/peaky/tight sensitivity distribution:
> http://dl.dropbox.com/u/9713279/SensorSpatialResponse.png
> and I have placed the .dat file here:
> http://dl.dropbox.com/u/9713279/WattStopper_LS-290C.dat
> Why do you believe that using glow probably won't make much difference -
> unless my sensor has a tight and/or peaky sensitivity distribution?
>
>
> Enjoy the weekend. It is pre-summer in Denmark; we've had blue sky for the
> last 14 days, 20C and sun ....who said I miss California?? ;-)
>
> Best,
> Anne
>
>
> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 29 Apr 2011 09:30:48 -0700
>> From: Andy McNeil <amcneil at lbl.gov>
>>
>> To: Radiance general discussion <radiance-general at radiance-online.org>
>> Subject: Re: [Radiance-general] Three-Phase Method - subdivision of
>>        window  with sensor located close to the window
>> Message-ID: <1DB1235F-E7F9-4392-90E3-444D2661F794 at lbl.gov>
>>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> Hi Anne,
>> Just curious, how do the glow results compare to the light sources?  Could
>> you update the graph with the sensor signals using the glow material?
>> Andy
>>
>>
>>
>>
>
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>
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