Rgb Lasersysteme QWAVE UV Lux-Meter, illumination measuring device, Brightness meter, DSA491006 Datenbogen
Produktcode
DSA491006
Qwave User Manual
8
Dark spectra for the spectrometer are stored in the device and used automatically when
taking spectra (see chapter 3.9 for details). If you have background radiation, you can
compensate for it by taking a background spectrum (see chapter 3.8). In the Exposure
Toolbar you can also select the triggering mode (see chapter 3.10) and choose a
reference spectrum for absorption, reflection and transmission spectroscopy (see chapter
3.8).
taking spectra (see chapter 3.9 for details). If you have background radiation, you can
compensate for it by taking a background spectrum (see chapter 3.8). In the Exposure
Toolbar you can also select the triggering mode (see chapter 3.10) and choose a
reference spectrum for absorption, reflection and transmission spectroscopy (see chapter
3.8).
3.4 Spectrum Display
The Main Diagram Panel displays all spectra that are marked by a check mark in the
Spectrum List. If no spectrum is checked in the list, then the currently selected spectrum
(marked by a gray bar) is displayed. You can check and uncheck all spectra at once by
clicking on the corresponding button [ ] or [ ] on top of the Spectrum List.
Spectrum List. If no spectrum is checked in the list, then the currently selected spectrum
(marked by a gray bar) is displayed. You can check and uncheck all spectra at once by
clicking on the corresponding button [ ] or [ ] on top of the Spectrum List.
The peaks in the spectra are automatically determined. This not only works pretty reliable
for clearly defined peaks, but also for those lying in the side of another peak or those that
are just above the noise level. If necessary, you can fine-tune the parameters for finding
the peaks by choosing “Peak Finder Parameters” from the Tools menu. In this window
you can choose three settings:
for clearly defined peaks, but also for those lying in the side of another peak or those that
are just above the noise level. If necessary, you can fine-tune the parameters for finding
the peaks by choosing “Peak Finder Parameters” from the Tools menu. In this window
you can choose three settings:
• “Absolute threshold” determines how much a peak must be above the noise level
in order to be considered as a peak.
• “Relative threshold” describes how large a peak must be compared to the local
minima before and after it in order to be considered as a peak.
• “Position threshold” determines how much of the top part of the peak is
considered when calculating the peak position.
Peak positions and widths are only displayed for the currently selected spectrum. The
peak positions, heights and widths are also displayed in the Properties Panel and can be
exported by choosing “Export Peaks” from the File menu.
peak positions, heights and widths are also displayed in the Properties Panel and can be
exported by choosing “Export Peaks” from the File menu.
In the Display Parameters Panel below the diagram you can select how the spectra are
displayed. These settings affect the diagram display, but do not modify the actual data.
Here you can change the scaling of both axes, the unit of the wavelength axis, turn the
display of the grid, peak positions and peak heights on and off and see the coordinates of
the current position of the mouse pointer.
displayed. These settings affect the diagram display, but do not modify the actual data.
Here you can change the scaling of both axes, the unit of the wavelength axis, turn the
display of the grid, peak positions and peak heights on and off and see the coordinates of
the current position of the mouse pointer.
If you zoom into the wavelength axis, a scrollbar appears at the bottom of the diagram
for easily moving the displayed part of the spectrum. Alternatively, you can grab and
move the axis with the mouse. You can also drag the intensity axis in order to change the
maximum value and quickly enlarge weaker parts of the spectrum.
for easily moving the displayed part of the spectrum. Alternatively, you can grab and
move the axis with the mouse. You can also drag the intensity axis in order to change the
maximum value and quickly enlarge weaker parts of the spectrum.
If you would like to determine the intensity value at the position of the mouse pointer
relative to a reference value, just move the mouse to that reference value, click with the
right mouse button and choose “Set reference level”.
relative to a reference value, just move the mouse to that reference value, click with the
right mouse button and choose “Set reference level”.
You can select a single wavelength or a range of wavelengths by clicking or clicking and
dragging in the diagram. This selection can be used to compare wavelength values, to
dragging in the diagram. This selection can be used to compare wavelength values, to