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Related Experiment Videos

Interferential scanning grating position sensor operating in space at 4 K.

Guy Michel1, Kjetil Dohlen, Jerome Martignac

  • 1Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, 5 place Jules Janssen, 92195 Meudon Cedex, France. guy.michel@obspm.fr

Applied Optics
|December 3, 2003
PubMed
Summary

A new cryogenic position sensor was developed for space telescopes operating at 4 K. This sensor precisely controls interferometer mirror movement for deep space imaging applications.

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Area of Science:

  • Astrophysics and Space Instrumentation
  • Cryogenic Engineering
  • Optical Metrology

Background:

  • Space telescopes require highly sensitive instruments for deep space observation.
  • Interferometers are crucial for spectral and photometric imaging, demanding precise mirror control.
  • Operation at deep cryogenic temperatures (4 Kelvin) presents significant engineering challenges for electronic and optical components.

Purpose of the Study:

  • To adapt a commercial interferential position sensor for deep cryogenic (4 K) space operation.
  • To ensure reliable control of moving mirrors and interferogram sampling for the Herschel space telescope's SPI instrument.
  • To address challenges related to cooling optical parts, component efficiency at 4 K, and signal preamplification in a cryogenic environment.

Main Methods:

Related Experiment Videos

  • Modification of a commercial interferential position sensor for deep cryogenic compatibility.
  • Selection of optoelectronic components demonstrating efficiency at 4 K.
  • Design of a cryogenic preamplifier to process sensor signals.
  • Implementation of a fully redundant focal plane for enhanced reliability.

Main Results:

  • Successful adaptation of a commercial sensor for 4 K operation.
  • Demonstrated capability for precise control of interferometer mirror displacement.
  • Effective sampling of interferograms at deep cryogenic temperatures.
  • Minimization of cooling effects on critical optical and electronic parts.

Conclusions:

  • The developed cryogenic interferential position sensor is suitable for demanding space applications like the Herschel telescope.
  • The sensor design ensures reliable performance and precise measurements in deep cryogenic environments.
  • This work advances the capabilities of submillimetric imaging Fourier-transform spectrometers for space-based astronomy.