| Author | Message | ||
     John Hamann (Schirm) |
I am working with a NIR system fitted with a fiber optic cable with a length of less than three meters. I remember hearing once that the nature of the fiber optics will not allow the performance of the wavelength linearization and performance tests over the full range (1100 to 2200 nm) of the instrument. It was explained that one end, or both, would have to be reduced during the performance testing in order for the system to pass. Does anyone have information to confirm this? The particular instrument has no problems with other non-fiber accessories but is failing using the fiber optics. | ||
| hlmark |
John - I think your best bet is to contact the instrument manufacturer, and ask them what they have in mind with that statement. If you can't contact the manufacturer for some reason, then I think that anybody with information would need to know who the manufacturer is, since it is probably an instrument-specific characteristic Howard \o/ /_\ | ||
| Michel Coene (Michel) |
Most fibers will start absorbing quite heavily above 2000 nm. If the tests you describe are very sensitive then it could very well be that you don't have enough S/N in that area. As Howard said, if you bought spectrometer and accesory from the same vendor, they should be able to help you. Wavelength standardisation should be possible with a short loop-back fiber though. No need to hang the full accesory on. | ||
| Piper |
I am working with a pharm manufacturer, that is using an FTNIR, Some of the representative series only have a sample or two, making the radii for acceptability very small. Is there any info available for the FDA, that says a sample spectra is good, providing the sample spectra matches the reference spectra, even though it fails the radii criteria due to lack of samples? Any info would be appreciated, thank you. |