[Radiance-general] Re: Re: Comparison of values measured by sensors and calculated with Radiance (Greg Ward) (Minki Sung)

[Greg Ward]

Hi Sung,

I'm not exactly sure what we are looking at with these plots, but  
it's clear that you need to characterize the sensor response in order  
to understand the situation.  Did  you perform the cosine sensitivity  
experiment I suggested?  You could mask off a portion of the center  
of a tube if you don't have a small UV source, and see how the sensor  
responds as a function of incident angle at a fixed distance.

-Greg

> From: Minki Sung <mkii at iis.u-tokyo.ac.jp>
> Date: April 5, 2009 7:46:34 AM EDT
>
> Dear Greg,
>
> I have done some additional measurements and the results show as  
> follow.
>
> http://iga.iis.u-tokyo.ac.jp/tmp/test01.gif  Setup
> http://iga.iis.u-tokyo.ac.jp/tmp/test02.gif  Fluorescent lamp  
> (Measurement)
> http://iga.iis.u-tokyo.ac.jp/tmp/test03.gif  Simulation
> http://iga.iis.u-tokyo.ac.jp/tmp/test04.gif  UV lamp (Measurement)
>
> The results indicate the UV lamp has different diffuse  
> characteristics compared with common fluorescent lamps if the UVC  
> sensor is cosine corrected well as written in the sensor. If there  
> is no problem with UVC sensor, it might be not easy to model UV  
> lamp with RADIANCE.
>
> Best Regards,
>
> Sung