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5.13 Fabry-Pérot Resolution and Line Profiles

Measurements of the Fabry-Pérot efficiency and resolving power were made during ground testing using a far-infrared laser at a number of spot wavelengths (Emery et al. 1993, [15]). It has proved difficult to confirm these measurements in-orbit owing to an absence of emission lines that are sufficiently narrow so that the intrinsic width of the line can be ignored with respect to the resolution element of the Fabry-Pérot. The presence of transient effects (Section 6.9) also causes the lines to be artificially broadened. The resolving power as derived from ground testing are listed in Table 5.22.


Table 5.22: Fabry-Pérot resolving power and resolution values for each detector, as measured on the ground before launch.
FP Det. $\lambda$ res. power res. element
    [$\mu $m]   [$\mu $m]
FPS SW1 47.00 8600 0.0055
  SW2 56.17 8450 0.0066
  SW3 66.09 8200 0.0081
FPL SW4 75.68 7800 0.0097
  SW5 84.80 9200 0.0092
  LW1 102.42 9700 0.0105
  LW2 122.19 9600 0.0127
  LW3 141.78 9250 0.0153
  LW4 160.59 8900 0.0180
  LW5 178.00 8500 0.0209


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Next: 5.14 Accuracy of the Up: 5. Calibration and Performance Previous: 5.12 Fabry-Pérot Wavelength Calibration
ISO Handbook Volume III (LWS), Version 2.1, SAI/1999-057/Dc