Operational Performance of the TIMED Doppler Interferometer (TIDI)

Wilbert R. Skinner, Rick J. Niciejewski, Timothy L. Killeen, Stanley C. Solomon, Daniel Gablehouse, Qian Wu, David Ortland, David A. Gell, Alan R. Marshall, Edwin Wolfe, Marie Cooper, Julie F. Kafkalidis

Research output: Contribution to journalConference articlepeer-review


The TIMED Doppler Interferometer (TIDI) is a Fabry-Perot interferometer designed to measure winds in the mesosphere and thermosphere (60-180 km) as part of the TIMED mission. TIDI is a limb viewer and observes emissions from OI 557.7 nm and rotational lines in the O 2(0-0) Atmospheric band. Wind measurement accuracies approach 3 ms -1 in the mesosphere and 15 ms -1 in the thermosphere. The TIDI instrument's performance during the first year and a half of operation is discussed in this paper. Many subsystems are working as designed. The thermal control system is holding the instrument temperatures at their desired set-points. The CCD detector is working as expected with no changes observed in the gain, bias or read noise. The instrument suffers from a light leak that causes the background to be elevated and increases the uncertainty in the wind measurement. Nothing can be done to eliminate this problem but modeling of the background has eliminated any systematic effect. Water outgassing from the spacecraft or instrument has deposited as ice on some part of the optics and reduced the instrument's sensitivity. This problem has been reduced by two spacecraft rolls which pointed the TIDI radiator to view more of the earth causing the optics to warm up and sublimate much of the ice.

Original languageEnglish (US)
Pages (from-to)47-57
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2003
Externally publishedYes
EventOptical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research V - San Diego, CA, United States
Duration: Aug 7 2003Aug 8 2003


  • Fabry-Perot interferometers
  • Remote sensing
  • Wind measurements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Operational Performance of the TIMED Doppler Interferometer (TIDI)'. Together they form a unique fingerprint.

Cite this