Re: instrument calibration
Re: instrument calibration
- Subject: Re: instrument calibration
- From: Robin Myers <email@hidden>
- Date: Sat, 29 Jun 2002 19:22:00 -0700
- Organization: Robin Myers Imaging
>
I suddenly getting really awful profiles. Seems to be a myriad of
>
possibilities. I'm wondering, how do any of us know our measuring
>
devices remain within spec? Is there some standard against which they
>
can be checked? Is this a service provided by anyone? Blind faith?
>
I'm leery of my Spectrocam, though it's only one possibility. I hear
>
they are history.
>
How do all of you rest assured your device is reliable and remains so?
I have a white Spectralon reference tile that is calibrated to NIST standards that I can
measure spectrophotometers against. When your spectrophotometer gets too far from the
standard, it should go back to the manufacturer for recalibration and recertification. I
know that GretagMacbeth and X-Rite have services for recalibrating their instruments. You
should check with SpectroStar to see if they also offer this service. If you really want
to check the accuracy of the spectrophotometer, erbium oxide and holmium oxide standards
can be used. They have much more precisely defined peaks and valleys in their reflectance
spectra that can be used for determining wavelength accuracy of your instrument.
Robin Myers
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