Ocean Optics OOIBase16 User Manual

Page 7

Irradiance Mode

This command switches the current window into relative Irradiance Mode. The reference spectrum must be
made in Scope Mode with a blackbody of known color temperature. A dark spectrum is usually obtained by
removing the fiber from the reference lamp and preventing light from entering it. (See

Doing an

Experiment

on page 15 for details.) Relative irradiance spectra are a measure of the intensity of a light

source relative to a reference emission source. Relative irradiance is calculated by the following equation:

- D

= B

(

- D

)

= relative energy of the reference calculated from the color temperature in degrees Kelvin,

= sample intensity of each wavelength, D

= dark intensity of each wavelength,

= reference intensity of each wavelength,

= each wavelength

Snapshot

This command freezes the data acquisition for the current spectral window and allows you to continue to
view a single spectrum.

Autoscale Y Axis

This command automatically adjusts the vertical scale of a current graph so the selected area fills the graph.

Change Graph Scale

This command opens a dialog box allowing you to manually set both the vertical and horizontal scale of
the graph.

Unscale Graph

This command returns the graph to its default scale.

Colors

This command allows the user to choose a color for the frames, background, trace, text, grid, and cursor. It
is especially useful if multiple channels are being used. Utilize this function to differentiate one channel’s
display from another.

Cursor

This command toggles a vertical cursor on the current graph. The cursor can be moved with either the
yellow arrows in the toolbar or via the following keystrokes:

Keystroke

Command

Page Up

Moves vertical cursor 25 pixels to the right

Page Down

Moves vertical cursor 25 pixels to the left

# (right arrow)

Moves vertical cursor 1 pixel to the right

$ (left arrow)

Moves vertical cursor 1 pixel to the left

% (up arrow)

Moves vertical cursor to beginning pixel

& (down arrow)

Moves vertical cursor to end pixel

(less than, comma)

Moves vertical cursor to next peak

(greater than, period)

Moves vertical cursor to previous peak

Grid

This command toggles the display of a vertical and horizontal grid on the graph.