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etc_calibration

This is an old revision of the document!

ETC_calibration

ETC calibration

Initial calibration

The purpose of initial calibration is to check the calibration of the instrument before the maintenance works. Also evaluate the current calibration performance and if the Standard Lamp traces properly the changes. For this analysis we use the blind-days data with the configuration and the SL reference values provided by the operators. The ozone percentage ratio against the reference vs ozone slant column are shown on Figure 5 : Ozone percentage difference of the instruments against RBCC-E referenceFigure 5 ( RBCC-E reference) and Figure 6 (IOS reference). The effect of stray light on IOS reference is clear for this plot.

Figure 5 : Ozone percentage difference of the instruments against RBCC-E reference

<br>

Figure 6&nbsp;: Ozone percentage difference of the instruments against IOS reference

<br> In order to evaluate if the SL track the calibration we perform a calculation of the ETC for the blind period. The ETC is obtained by comparison with reference brewerIZO#185 using simultaneous measurements during the blind period (two measurements are considered simultaneous if the time difference is less than three minutes). Measurements with airmass difference greater than 3% were removed from the analysis. From the ozone fourmula (1,1) we can derive the ETC calculation<br>

<br> <math>ETC=F-{{O}_{3ref}}\alpha *m</math>(1.5)

<br> The corrected counts (F) and the airmass factor (m) are known, and the ozone absorption coefficient&nbsp;<math>\alpha</math> can be computed from the wavelength calibration, so using the simultaneous ozone data from the reference instrument, the ETC can be derived.

<br> The ETC depends of the value of ozone absorption coefficient. For all the brewers we use the initial configuration value with the exception in the Brewer #156 than we use the calculated values (see previous section). Only for the brewer #040 the SL tracks the change observed in ETC, in other words the application of the SL correction only improves the comparison in this particular brewer (Table 5 ). We have to take in to account that all the brewer were previously calibrated against #017, this comparison is in preparation.

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Table 5&nbsp;: Summary of ETC and SL correction for the blind days values around +/-5 five on the last columns indicates that SL tracks the ETC detected change.

<br>

Ozone comparison: Final calibration

The calibration use the final days observations with the method described on previous section. On Table 6 summarizes the changes and Figure 7 the ratios against the reference. The difference between single brewers and double brewers is clear with an underestimation about .5% for #074 and #072 and 1% for #017 and #040 at 1k DU (osc).

<br>

Figure 7&nbsp;: Ozone Percentage difference between the instruments final calibration

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Table 7: Final Calibration Summary

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Table 6: Summary of changes during calibration (NC no change, TC Temperature Coef, DT (Dead Time), HG change hg test line)

<br>

etc_calibration.1425031409.txt.gz · Last modified: 2015/02/27 10:03 by 0.0.0.0

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