Техническая Спецификация для Rgb Lasersysteme QWAVE UV Lux-Meter, illumination measuring device, Brightness meter, DSA491006
Модели
DSA491006
Qwave User Manual
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exposure times less than 1 second and increase slower for exposure times larger than 1
second. If you find this to be the case, close the window by clicking on the “OK” button
and the new dark spectrum calibration is saved into the device. Otherwise you may
calibrate again or click “Cancel”.
second. If you find this to be the case, close the window by clicking on the “OK” button
and the new dark spectrum calibration is saved into the device. Otherwise you may
calibrate again or click “Cancel”.
Spectral Sensitivity
Like in all spectrometers, the sensitivity of the Qwave spectrometer is not uniform across
the spectrum, but depends on the wavelength. This is called “Spectral Sensitivity” and
can be corrected by dividing each value of the spectrum by the corresponding sensitivity.
This sensitivity calibration is also stored in the device. However, it is not always used
when taking spectra, because if the sensitivity is corrected, the noise level is unevenly
distributed across the spectrum. Instead, you can choose to use the spectral sensitivity
correction by selecting the “lightmeter” button in the Exposure Toolbar.
the spectrum, but depends on the wavelength. This is called “Spectral Sensitivity” and
can be corrected by dividing each value of the spectrum by the corresponding sensitivity.
This sensitivity calibration is also stored in the device. However, it is not always used
when taking spectra, because if the sensitivity is corrected, the noise level is unevenly
distributed across the spectrum. Instead, you can choose to use the spectral sensitivity
correction by selecting the “lightmeter” button in the Exposure Toolbar.
If you would like to recalibrate the spectral sensitivity, you need a light source with a
continuous spectrum (like a tungsten halogen lamp) and a calibrated spectrum for this
lamp.
continuous spectrum (like a tungsten halogen lamp) and a calibrated spectrum for this
lamp.
To recalibrate, take a spectrum of your light source with spectral sensitivity correction
turned off. Make sure the spectrum contains as little noise as possible by using a strong
light source, a suitable exposure time and use Temporal Averaging. Then choose
“Calibrate Spectral Sensitivity” from the Tools menu. Click on the “Load reference data”
button to load the calibrated reference spectrum (in other words: a spectrum file that
shows how your light source really looks like). Based on the measured spectrum and this
file, the software calculated the spectral sensitivity of your spectrometer and shows it as a
dark green line. To save this new calibration to the device, click “OK”.
turned off. Make sure the spectrum contains as little noise as possible by using a strong
light source, a suitable exposure time and use Temporal Averaging. Then choose
“Calibrate Spectral Sensitivity” from the Tools menu. Click on the “Load reference data”
button to load the calibrated reference spectrum (in other words: a spectrum file that
shows how your light source really looks like). Based on the measured spectrum and this
file, the software calculated the spectral sensitivity of your spectrometer and shows it as a
dark green line. To save this new calibration to the device, click “OK”.
If you also want to calibrate the absolute scale of the intensity axis, you need to take a
spectrum and also need to know the absolute optical power (in Watts) of this spectrum. If
you measure the actual optical power with an optical powermeter, please make sure that
the powermeter only detects wavelengths that are within the wavelength range of your
spectrometer (for example by choosing a suitable light source). Then choose “Calibrate
power” from the Tools menu and enter the actual power. If you click “OK”, the new power
calibration is stored in the device and used for scaling the intensity axis. This axis then
displays the spectral power density in nW/nm.
spectrum and also need to know the absolute optical power (in Watts) of this spectrum. If
you measure the actual optical power with an optical powermeter, please make sure that
the powermeter only detects wavelengths that are within the wavelength range of your
spectrometer (for example by choosing a suitable light source). Then choose “Calibrate
power” from the Tools menu and enter the actual power. If you click “OK”, the new power
calibration is stored in the device and used for scaling the intensity axis. This axis then
displays the spectral power density in nW/nm.
In addition, you don’t have to calibrate the power at the spectrometer entrance. For
instance, you could calibrate the power that enters your measurement probe or any
other power in your setup, as long as it is proportional to the power that enters the
spectrometer. Just remember that the optical powers and power densities displayed by
the software refer to this value.
instance, you could calibrate the power that enters your measurement probe or any
other power in your setup, as long as it is proportional to the power that enters the
spectrometer. Just remember that the optical powers and power densities displayed by
the software refer to this value.