Ocean Optics OOIIrrad-C - Manual (Page 21)

3: Controls and Menus
Channel Parameters
The Channel Parameters allow you to set the following acquisition parameters for the current channel:
• Scans to Avg – The number of spectral scans averaged for each displayed spectra. This parameter
affects all channels in the system. Higher values result in better signal-to-noise ratios. Signal-to-
noise improves by the square root of the number of scans averaged.
• Smoothing Size – The number of adjacent pixels to average. For example, a value of 5 averages
the pixel itself, 5 pixels to the left, and 5 pixels to the right. Greater values result in smoother data
and higher signal-to-noise ratios. If you set the value too high, a loss in spectral resolution results.
Signal-to-noise improves by the square root of the number of pixels averaged.
• Nominal Integ. Period – The time the spectrometer monitors the incoming signal. Integration time
is analogous to the shutter speed of a camera. Adjust this value in Scope Mode until the peak
intensity is approximately 3500 counts.
• Actual Integ. Period – This value is displayed after you enter a Nominal Integration Period and
take a scan. You cannot modify this value; it changes automatically with the Nominal Integration
Period. The calculation used for this value is: Nominal Integration x 1.024 milliseconds (on most
A/D converters).
Scan Controls
The Scan Controls allow you to configure the behavior of the scan process in OOIIrrad. The toggle switch
turns the scan function on or off. Once the toggle switch is turned on, the radio buttons to the right
instruct OOIIrrad to take a single scan or scan continuously until the toggle switch is turned off. Click on
the toggle switch to turn it on/off.
Analysis Control
The Analysis control allows you to activate analysis in a variety of methods for both irradiance and color
measurements. When the Analysis control is on, OOIIrrad performs calculations pertaining the
measurement you configure.
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