Re: Something wrong with Diffusion coefficient of OPT-PROP ?

Hi again

moving from previous to this thread

> So the diffusion coefficient in OPT-PROP actually means
> reduced_scatter_coefficient ?

It is in fact the Rayleigh scattering coefficient [cm^-1]

> And the value of 1.22 cm^-1 in the example seems not right, it should
> be 1.22E-05 cm^-1, as you can see from the attached snapshot of the
> 1978 paper it claimed. (emphasized with red box)

Right, in the manual example (Example 3 last line in OPT-PROP) there is
an unfortunate mistake: WHAT(3) should indeed be 1.22E-05

Best wishes

Francesco

**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854

On Mon, 7 Jan 2013, zhiqiu li wrote:

> Dear group,
>
> During my experiment with Cherenkov optical photon generation, I got
> puzzled about the definition of diffusion coefficient in OPT-PROP
> card.
>
> According to the online manual of OPT-PROP card, the unit of diffusion
> coefficient is cm^-1. And at the bottom of that page, a example value
> of 1.22 cm^-1 was given, and it claimed to be according to Querry's
> paper on Appl.Opt. 17, 3587 (1978).
>
> But from my knowledge, diffusion coefficient should be in unit of cm,
> instead of cm^-1, because :
>
> diffusion_coefficient = 1/3(absorption_coefficient +
> reduced_scattering_coefficient)
>
> where the unit of absorption and scattering coefficients is cm^-1, and
> "reduced" takes anisotropy into consideration.
>
> So the diffusion coefficient in OPT-PROP actually means
> reduced_scatter_coefficient ?
>
> And the value of 1.22 cm^-1 in the example seems not right, it should
> be 1.22E-05 cm^-1, as you can see from the attached snapshot of the
> 1978 paper it claimed. (emphasized with red box)
>
> Hope someone can clarify that to me. Thanks very much~
>
> - Zhiqiu Li
>
Received on Mon Jan 14 2013 - 17:25:38 CET