European Minor Constituent Radiometer: A New Millimeter Wave Receiver for Atmospheric Research
- 28 Downloads
EMCOR is a heterodyne receiver for the frequency range of 201 to 210 GHz. It has been designed for ground-based measurements of various minor constituents of the stratosphere involved in ozone chemistry. Since the aim was the detection of faint spectral lines, a superconducting tunnel junction has been chosen as mixer element and special care has been taken in developing the calibration unit of the system. The front-end is completed by a quasi-optical system, a solid state local oscillator with electronic tuning and a HEMT pre-amplifier. In the back-end an acousto-optical spectrometer is employed to analyse the signal. A PC controls the whole system. The instrument has been installed at a high mountain site in the Swiss Alps.
Unable to display preview. Download preview PDF.
- J. de la Noë, P. Ricaud, P. Baron, G. Beaudin, C. Viguerie, J.-R. Pardo, J. Cernicharo, A. Barcia, J.-D. Gallego, N. Kämpfer, D. Maier, R. Peter, D. Matheson, B. Ellison, R. Siddans, K. Künzi, U. Klein, B. Franke, J. Louhi, M. Gustafsson, J. Mallat, and A. Räisänen, “A European microwave radiometer to measure some stratospheric minor constituents: the emcor instrument,” in Proceedings of the 2nd ESA Workshop on Millimetre Wave Technology and Applications: Antennas, Circuits and Systems, Millilab, Espoo, Finland, May 1998.Google Scholar
- J. de la Noë, P. Ricaud, P. Baron, O. Lezeaux, C. Viguerie, J.-R. Pardo, G. Beaudin, J. Cernicharo, A. Barcia, J.-D. Gallego, D. Maier, R. Peter, N. Kämpfer, W. Amacher, A. Widmer, M. Wüthrich, B. Ellison, D. Matheson, R. Siddans, B. Kerridge, U. Klein, B. Barry, K. Künzi, J. Louhi, M. Gustafsson, J. Mallat, and A. Räisänen”, “Development of a European ground-based microwave radiometer to measure stratospheric minor constituents,” Final Report to the EC, contract ENV4-CT95-0137, 1999.Google Scholar
- J.J. Gustincic, “A quasi-optical receiver design,” in IEEE-MTT-S, International Microwave Symposium Digest, San Diego, May 1977, pp. 99-100.Google Scholar
- P.F. Goldsmith, “Quasi-optical techniques at millimeter and submillimeter wavelengths,” in Infrared and Millimeter Waves vol. 6: Systems and Components, K.J. Button, Ed., New York, 1982, Academic Press.Google Scholar
- J. Louhi, M. Gustafsson, J. Mallat, and A. Räisänen, “Local oscillator and IF chain for European millimeter wave radiometer, EMCOR,” Report S229, Helsinki University of Technology, Radio Laboratory, October 1997.Google Scholar
- J.D. Gallego, R. Baeza, R. Garcia, and D. Geijo, “Measurements of EMCOR cryogenic 3.9–4.9 GHz HEMT amplifier,” Technical report CAY 1997-1, Centro Astronómico de Yebes, May 1997.Google Scholar
- A. Parrish, R.L. de Zafra, P.M. Solomon, and J.W. Barrett, “A ground-based technique for millimeter wave spectroscopic observations of trace constituents,” Radio Science, vol. 23, pp. 106-118, 1988.Google Scholar
- R. Krupa, Millimeterwellen-Radiometrie stratosphärischer Spurengase unter Anwendung balancierter Kalibrierung, Ph.D. thesis, University of Karlsruhe, 1997.Google Scholar
- T. Ingold, R. Peter, and N. Kämpfer, “Weighted mean tropospheric temperature and transmittance determination at millimeter-wave frequencies for ground-based applications,” Radio Science, vol. 33, pp. 905-918, 1998.Google Scholar
- C.D. Rodgers, “Retrieval of atmospheric temperature and composition from remote measurements of thermal radiation,” Rev. Geophys. Space Phys., vol. 14, pp. 609-624, 1976.Google Scholar
- M. Kuntz, “Retrieval of of ozone mixing ratio profiles from ground-based millimeter wave measurements disturbed by standing waves,” J. Geophys. Res., vol. 102,no. D18, pp. 21,965-21,975, 1997.Google Scholar