wavelength_calibration
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wavelength_calibration [2015/02/27 10:03] 0.0.0.0 created |
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| - | ====== Wavelength_calibration ====== | ||
| - | ===== Wavelength calibration. ===== | ||
| - | ==== Introduction ==== | ||
| - | (Cal-step, dispersion slpines vs cuadratic, ozone lines....) | ||
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| - | ==== Analysis ==== | ||
| - | Analysis of 2007 and 2008 dispersion tests was made for all the instruments participating in the Arosa 2008 intercomparison campaign. Main results are summarized in Table 4. During the maintenance the cal-step of the brewers from Arosa (#064, #072 and #156) were adjusted and for #072 also changes the Hg reference line. For this brewer comparison of Ozone absorption coefficients before and after the maintenance is not direct and we use the absolute steps from the micrometer to perform the comparison. | ||
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| - | The wavelength is determined by the step motor that controls the dispersion grating, the resolution achieved in one step is about 0.3% in ozone absorption coefficient which results in a 0.3% in total ozone. We consider this precision of the brewer in wavelength to decide if we change or not the ozone dispersion coefficient. If the change is plus/minus one step we consider the same results and don't change the value and if the change is greater than 2 steps the change is performed. | ||
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| - | <br> | ||
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| - | {| style="border-spacing: 0pt;" | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | Brewer | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | α orig | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 2007 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | α final | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 2008 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | observations | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | IOS#017 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3380 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3395 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3380 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | No Changes | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | IOS#040 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3400 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3403 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3384 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3331 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | Calc-Step | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | POL#064 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3423 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3425 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3423 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3428 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | No Changes | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | ARO#072 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3434 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3422 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3397 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3397 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | Calc-Step/HG | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | ARO#156 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3467 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3425 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3409 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3409 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | Calc-Step/HG | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | WRC#163 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3394 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3406 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3414 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | 0.3414 | ||
| - | | style="border-width: 0.018cm 0.018cm medium; border-style: solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) -moz-use-text-color; padding: 0cm 0.191cm;" | Y | ||
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| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | IZO#185 | ||
| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | 0.3422 | ||
| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | 0.3416 | ||
| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | 0.3422 | ||
| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | 0.3425 | ||
| - | | style="border: 0.018cm solid rgb(0, 0, 0); padding: 0cm 0.191cm;" | No Changes | ||
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| - | **Table 4: Summary of the wavelength calibration: ozone absorption coefficient α for the initial calibration and final calibration the calculated values for the dispersion performed in 2007 and 2008 and in the last column reason of the changes of the wavelength calibration.** | ||
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| - | <br> There are two remarkable cases: | ||
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| - | #Brewer #040 the dispersion test performed in 2007 are agree with the configuration value but is quite different compare to the value calculated in 2008 (1.5 %), considering the long history of the instrument we decide to maintain the 2007 value updated to the new cal-step position. | ||
| - | #Brewer #156 the ozone absorption coefficient in use in this brewer is in disagreement (1.2 %) with the dispersions performed in 2007 and 2008. This produces a slope, when compare the ozone of this brewer with both references vs. ozone slant path (Figure 5 and Figure 6) results in overestimation in low ozone slant path and underestimation in higher. | ||
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wavelength_calibration.1425031410.txt.gz · Last modified: 2015/02/27 10:03 by 0.0.0.0
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