How do you handle the calibration and alignment of spectrographs or other instruments used for spectral analysis?

Sample interview questions: How do you handle the calibration and alignment of spectrographs or other instruments used for spectral analysis?

Sample answer:

Calibration and Alignment of Spectrographs

• Wavelength calibration:

  • Use standard calibration lamps with known emission lines.
  • Compare observed spectra to known wavelengths to determine wavelength scale.
  • Apply corrections for temperature, pressure, and atmospheric conditions.

• Flux calibration:

  • Observe objects with known fluxes.
  • Compare observed fluxes to reference values to determine instrument sensitivity.
  • Apply corrections for atmospheric extinction and instrument throughput.

• Alignment:

  • Ensure proper alignment of optical components (mirrors, gratings, slits).
  • Use autocollimators or alignment lasers to check collimation and focus.
  • Adjust alignment parameters to optimize instrument performance and minimize artifacts.

Specific Considerations for Different Instruments:

• Imaging spectrographs:
  • Calibration involves determinin… Read full answer

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