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Technical details, 1/ρ s, E•s dλ – Kipp&Zonen UVS-E-T UV Radiometers User Manual

Page 43: Χ1/γ

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43

UVIATOR software manual

13.1 Processing Flow

This page illustrates the processing flow from UV measurement to corrected UV irradiance.

Before the program starts processing UV measurements, it calculates the correction factor χ from the atmosphere transmission model
(E

TUV

)

and the ideal (S

CIE

)

and actual (S

RF

)

radiometer response function. The integration range of λ is set by the S

RF

.

For each UV measurement, the program calculates the solar zenith angle (using location and time) and gets the ozone column
density (using the ozone plugin). Once the solar zenith angle and ozone column density are known, the correction factor value
is calculated using spline interpolation. The correction factor value will be multiplied with the UV measurement, resulting in the
corrected UV irradiance. Handling of trivial tasks, such as dealing with the offset voltage, are not depicted.

13. Technical Details

Correction factor χ as a function of the

Solar Zenith Angle and Ozone Colomn Density

(ρ is calibration factor, γ is adjustment factor)

S

CIE

E

TUV

÷

1/ρ

S

RF

SZA

Ozone plug-in

Location

E•S dλ

E•S dλ

χ

1/γ

Calculate UV irradiance by multiplying the

radiometer measurement with the correction factor χ

χ

time