| Author | Message | |||
     Tom Lillhonga |
Hello! It is a Sentronic InGaAs diode array instrument with 260 channels. The reference is measured several times, but there has been a problem doing it properly. The main component in the spectra should be due to some kind of glue applied on paper. Regards, Tom | |||
| David W. Hopkins (Dhopkins) |
Hi Tom, Here are some comments from Howard Mark and Dave Hopkins, we are at the FACSS meeting and saw your data. We are surprised at the large amount of noise even in the baseline regions, suggesting low light coming back from your reference material, as well as the sample. Did you rerun the reference, or are these from a single ref scan? Can you tell us what kind of samples you are measuring? What kind of instrument? We are impressed that even some small peaks seem to appear in most of the scans, as far as we can tell. Best wishes, Dave & Howard | |||
| Tom Lillhonga |
Thanks Tony! No, it was not that difficult. The reference is ok, and it is a reflection measurement (1/R). Regards, Tom | |||
| Tony Davies (Td) |
Tom, Well done! It was easy wasn't it!! I hope someone will recognise these. My only idea is grease in the optics but I cannot point you to any spectra. The peaks are very sharp. I assume that you have measured a background or reference so I am not sure why the detector should produce these peaks. You have not said if this is 1/R or 1/T. Best wishes, Tony | |||
| Tom Lillhonga |
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| Tom Lillhonga |
Yes, here comes the unknown spectra:  | |||
| Tom Lillhonga |
Yes, here comes the spectra: | |||
| Tony Davies (Td) |
Tom, I will just try that again to see if I can show you the actual formatting: This is the format to attach a file: \attach{sucrose spectrum} NOTE the use of curly brackets { } not ( ) when you post the message with an attachment it will prompt you to upload the file from your hard disk. I hope all users will note how easy this is and put more spectra on view for discussion. Best wishes, Tony | |||
| Tony Davies (Td) |
Tom, If you look under formatting in documentation from the menus on the left of your screen you will find that the required format for attaching a file is:
This is a PowerPoint slide but any type can be sent. If you record spectra of known different compounds you will soon discover if you have any artifacts. Best wishes, Tony | |||
| FH Long |
Tom, Is this a direct transmission or reflection spectrum ? GaAs is known to have numerous defects with absorption bands in the NIR. I suspect InGaAs would have similar type defects. | |||
| tom lillhonga |
We have InGaAs spectra with sharp peaks. We are unable to identify all of them. Maybe they are real and maybe they are artefacts? We were unable to attach the spectra. Those interested can ask us. We will send them by Email |
spectra
sucrose spectrum