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A: Calibration
Ocean Optics calibrations are done in relation to these international standards.
Ocean Optics provides a calibration of the DH-3PLUS plus-CAL on an absolute irradiance scale
in µW/nm/cm^2. The sources of uncertainties taken into account are listed below in the
example. The actual values are listed in the individual calibration certificate for your light source.
The calibration certificate contains more detailed information.
Quantity
1.
R
Uncertainty in reproducibility [R], caused by switching on/off
1.1
S
Stability[S] within 50 hours of operation
Influence of temperature [T] and humidity [F] in the air. The temperatures
during calibration have a temperature range of 19 °C to 25 °C. The humidity
might have influence for the calibration in the NIR for length larger than
2.
T & F
1100 nm.
Uncertainty in mounting distance of the detector probe (e.g. Cosine
Corrector. 1.8 % per 0.1 mm;
3.
d
integrating sphere minimal; bare fiber same as cc)
4.
ROT
Uncertainty from rotation [ROT] or centering of the detector probe
Uncertainty caused by wavelength calibration of the spectrometer
5.
D_Lambda
[D_Lamba[QE]=0,3 nm, D_Lambda[NirQ512]= 1-5 nm]
Uncertainty of the NIST traceable calibration light source and NIST traceable
6.
D_AbsIrrad
white standard on the calibration stand
7.
StrayL
Influence from spectrometers internal stray light
8.
T_TEC_
Influence of the sensor temperature [TEC] of the spectrometer.
9.
Dark
Influence from uncertainties of the measured dark level.
10.
Rep
Repeatability of the used spectrometer system
11.
SP_Lin
Linearity of the spectrometer system
12.
Bend
Uncertainty caused by bending [Bend] of the fibers.
These factors are taken into account for deriving the wavelength for resolved levels of
uncertainty (listed below).
18
Sources of Uncertainties
Source of uncertainty
355-00000-003-01
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