Ocean Insight OCEANHDX RAMAN, Быстрый старт

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MNL-1027 Rev A
5
Making the Most of Your Raman Data, on the Ocean Insight website, for additional
information on Clean Peaks and other tips for processing your Raman data.
o
Click Finish and you are ready to acquire Raman spectra!
FAQ
The readings should start at 785 nm but I’m seeing the graph start at zero. Why is this, and what is the
cm
-1
I’m seeing?
Raman emission is a relative energy shift referenced to the laser wavelength, which was the last step of
the Raman wizard. The cm
-1 is referred to as Raman Shifts or Wavenumbers, and these will start at zero
based on the reference laser. An interesting feature of Raman is that you will see very similar emissions
from different wavelength systems (785 nm vs. 532 nm, for example) when converted to these
wavenumbers, despite the actual wavelengths being quite different.
What laser power should I use?
Laser power is application-dependent, so you may need some iterative tests to find the appropriate level.
If there is a specific power you are trying to achieve, we recommend using a laser power meter at the
probe output to determine the true power level. You can do this at multiple points to create a rough power
correlation for your system.
The laser is on but I’m not seeing any output from the Raman probe.
There is a manual shutter on the business-end of the Raman probe. Ensure this is switched open.
Why are there negative Raman Shift values in
the Raman spectrum? Or Why is my Raman
spectrum shifted in the RamanShiftView?
If you are seeing a shifted spectrum caused by
negative Raman Shift values in your
RamanShiftView like those shown in the image
on the right, please update your OceanView
software to version 2.08 or higher. The newer
software versions remove these negative values
from the Graph display after you have run the
Raman Wizard as shown in the screenshot
below.