[argyllcms] Re: 2$ white reflectance standard?
- From: Ernst Dinkla <EDinkla@xxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 11 Mar 2010 17:59:00 +0100
Martin Weberg schreef:
2010/3/10 Ernst Dinkla <EDinkla@xxxxxxxxxxxxxxxxxx>:
To try it out I realised that there ought to be Teflon tape in the
workshop. There was.
You do not happen to have a link to a product description?
Martin Weberg
Martin,
I would like to see measurements of several brands from everywhere:-)
As long as the core is white plastic and the Teflon tape white. In the
US there are tape varieties that are colored to prevent the use of the
normal Teflon tape on oxygen gas bottles, tubing etc, the last should be
yellow. In the UK that marking is done with colored cores. But i expect
that white rolls are available everywhere.
The "Dutch" brands I measured are Griffon and Gastec. 4 qualities.
One of the Griffon qualities has the description:
BS 7786: Grade L 12mmx12mx0.076mm
Unitape (Gastec) Pressure or quality class 0.2 is another description
12mx0.1mm
There are Pro rolls of 19mm wide that may be more suitable for
measurements but they are not available in every Home Depot, Praxis,
Carrefour or a German equivalent of that.
I do not think there will be a difference between the measurements for
the different qualities. One quality is for gas + water tubes, the other
only for water.
Some references to the optical properties of PTFE:
http://en.wikipedia.org/wiki/Polytetrafluoroethylene
halfway the page
http://physics.nist.gov/Divisions/Div844/facilities/specphoto/pdf/appendI.pdf
http://www.sphereoptics.com/standards-targets.htm
--
Met vriendelijke groeten, Ernst
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