Preprints
https://doi.org/10.5194/amt-2024-22
https://doi.org/10.5194/amt-2024-22
26 Apr 2024
 | 26 Apr 2024
Status: this preprint is currently under review for the journal AMT.

The Far INfrarEd Spectrometer for Surface Emissivity (FINESSE). Part 1: Instrument description and level 1 radiances

Jonathan Ernest Murray, Laura Warwick, Helen Brindley, Alan Last, Patrick Quigley, Andy Rochester, Alexander Dewar, and Daniel Cummins

Abstract. The Far INfrarEd Spectrometer for Surface Emissivity (FINESSE) instrument combines a commercial Bruker EM27 spectrometer with a front end viewing and calibration rig developed at Imperial College London. FINESSE is specifically designed to enable accurate measurements of surface emissivity covering the range 400–1600 cm-1 and as part of this remit, can obtain views over the full 360° angular range.

In this Part (I) we describe the system configuration, outlining the instrument spectral characteristics, our data acquisition methodology and the calibration strategy. As part of the process, we evaluate the stability of the system, including the impact of knowledge of blackbody target emissivity and temperature. We also establish a numerical description of the instrument line shape which shows strong, frequency dependent, asymmetry. We demonstrate why it is important to account for these effects by assessing their impact on the overall uncertainty budget on the level 1 radiance products from FINESSE. Initial comparisons of observed spectra with simulations show encouraging performance given the uncertainty budget.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Jonathan Ernest Murray, Laura Warwick, Helen Brindley, Alan Last, Patrick Quigley, Andy Rochester, Alexander Dewar, and Daniel Cummins

Status: open (until 01 Jun 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2024-22', Anonymous Referee #1, 21 May 2024 reply
  • RC2: 'Comment on amt-2024-22', Anonymous Referee #2, 29 May 2024 reply
Jonathan Ernest Murray, Laura Warwick, Helen Brindley, Alan Last, Patrick Quigley, Andy Rochester, Alexander Dewar, and Daniel Cummins
Jonathan Ernest Murray, Laura Warwick, Helen Brindley, Alan Last, Patrick Quigley, Andy Rochester, Alexander Dewar, and Daniel Cummins

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Short summary
We introduce a new instrument, FINESSE, designed to measure the ability of natural surfaces to emit infrared radiation. FINESSE combines a commercial instrument with custom-built optics which allow it to view a surface from different angles and obtain complementary views of the sky. Its choice of internal components means it can cover a wide range of wavelengths, extending into the far infrared. We characterise FINESSE’s uncertainty budget and provide examples of its measurement capability