Ocean Optics OOIIrrad-C - Manual (Page 16)

3: Controls and Menus
The following modes are available:
• Scope Mode – Allows you to completely control signal processing prior to calibrating the spectral
response of your system and taking measurements. Use Scope Mode when configuring your
system setup, adjusting integration times, performing spectral response calibrations, and taking
dark and reference scans. In Scope Mode, OOIIrrad-C displays the raw signal transmitted from
the A/D converter. Once you open OOIIrrad-C and begin data acquisition, OOIIrrad-C displays
the raw signal from the detector expressed in A/D counts (the vertical axis of the screen). Use
caution when operating in Scope Mode since this mode represents a combination of several
factors such as the intensity of the light source, the reflectivity of the grating and mirrors in the
spectrometer, the transmission quality of the fibers, the response of the detector, and the spectral
characteristics of the sample.
• µW/cm^2/nm Mode (Absolute Irradiance Mode) – W/cm^2/nm Mode (or Absolute Irradiance
Mode) allows you to graph the calibrated irradiance intensity of the sample being measured. You
can use Absolute Irradiance Mode after you calibrate the spectral response of your system and
take a dark scan (see Scope Mode). Absolute Irradiance Mode calculates the true irradiance of a
spectrum, displayed in actual
µW/cm^2/nm incident on the probe’s collection area.
• Reflectance Mode – Reflectance Mode is also the spectral processing mode used for transmission
spectroscopy, as the math necessary to compute transmission is identical to that required for
reflection. You must take both a dark and reference spectra in Scope Mode before you can access
Reflection Mode.
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