Ocean Optics RaySphere 1700 Install - Manual (Page 61)

9: Nonlinearity Correction, Stray Light Correction and Calibration
RAYSPHERE-1700-02-201304 51
The change in deviation (or slope of the curve) is taken into account for estimating the uncertainty in
spectral distribution. Arithmetic meanings of deviation are calculated in intervals which are defined for the
spectral match test. The following are the results:
Wavelength band
Arithmetic average of deviation in
wavelength band [%]
Arithmetic average minus offset in
wavelength band [%]
ΔI_B_rel
400 nm - 500 nm -1.81 -1.55
ΔI_B_rel
500 nm - 600 nm -1.34 -1.08
ΔI_B_rel
600 nm - 700 nm -1.01 -0.76
ΔI_B_rel
700 nm - 800 nm -0.82 -0.56
ΔI_B_rel
800 nm - 900 nm -0.59 -0.33
ΔI_B_rel
900 nm - 1100 nm -0.26 0.00
ΔI_G_rel
400 nm - 1100 nm -0.97 -0.71
The offset is chosen to minimize the interval of deviation.
The percentage of total irradiance in a wavelength Band R_B for one wavelength band is defined as:
R_B=I_B/I_G
There are two measured values I_B and I_G with measurement uncertainties
ΔI_B and ΔI_G. Using the
equations:
ΔI_B = I_B x ΔI_B_Rel and
ΔI_G=I_G x ΔI_G_Rel and the formula for the Gaussian error propagation