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Allan Variance Use in Radio-astronomical Instrumentation
by Dr. Rudolf Schieder
26 March 2001
Professor, University of Cologne
Physikalisches Institut, Universität zu Köln
| Telephone: |
01149-221/470-3568 |
| FAX: |
01149-221/470-5162 |
Dear colleague,
I have just discovered your web-page, and I would
like to make you aware of our introduction of Allan variance measurements
several years ago, which is now in use by many groups dealing with
radio-astronomical instrumentation. We have published our ideas about the
use of Allan variance plots many years ago, and for this you might have a look
on the following papers:
 | Characterization and Measurement of Radiometer Stability;
G.Rau, R.Schieder, B.Vohwinkel; Proc. 14th European Microwave Conf.,
Sept. 10-13, 1984, Liege, Belgium, 248-253 |
| Characterization and Measurement of System Stability;
R.Schieder, G.Rau, B.Vohwinkel; Proc. of a SPIE conference on
"Instrumentation for Submillimeter Spectroscopy", Dec.
5-6, 1985, Cannes, France |
| The Cologne Acousto-Optical Spectrometers; V.Tolls,
R.Schieder, G.Winnewisser; Experimental Astronomy 1, 101 (1989) |
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The last paper demonstrates the importance of the method for the successful
development of acousto-optical spectrometers (AOS) in general.
I would also like to bring to your attention that the Allan variance method
has also played an important role for the development of the first space-borne
AOS on board of NASAs Submillimeter Wave Astronomy Satellite (SWAS), which is
successfully operating since more than two years by now. For this see e.g.
| The SWAS Acousto-Optical Spectrometer; M.Klumb, J.Frerick,
V.Tolls, R.Schieder, G.Winnewisser; SPIE 2268, 305 (1993) |
| Acousto-Optical Spectrometers in Space; R.Schieder, J.Horn,
O.Siebertz, M.Klumb, J.Frerick, V.Tolls; The 30th ESLAB Symposium on
Submillimetre and Far-Infrared Space Instrumentation, ESTEC,
Noordwijk, The Netherlands, Sept. 24-26, 1996, ESA SP-388, 187 |
| SWAS-AOS: The First Acousto-Optical Spectrometer in Space;
J.Frerick, M.Klumb, R.Schieder, V.Tolls, G.Winnewisser, Proc.
"Infrared Spaceborne Remote Sensing VII", M.Strojnik,
B.F.Andresen Eds., SPIE 3759, 170-179 (1999) |
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We are presently working on a new generation of AOSs for the ESA
cornerstone mission HERSCHEL (former FIRST), for which the Allan variance
method also plays an important role. See also:
| Wide-Band Spectrometer for HIFI-FIRST; R.Schieder,
O.Siebertz, F.Schloeder, C.Gal, J.Stutzki, P.Hartogh, V.Natale,
Proc. of "UV, Optical, and IR Space Telescopes and
Instruments", J.B.Breckinridge, P.Jakobsen Eds., SPIE 4013,
313-324, (2000) |
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A similar development is going on for the air-borne observatory SOFIA in
Cologne. In all these papers the Allan variance are very important tools for
the development. Recently we have submitted a paper dealing exclusively with
consequences of Allan variance measurements for the observing strategy using
radio-astronomical observatories. The paper has recently been submitted, and,
in case you are interested, we can send you a copy.
With my best regards,
Rudolf Schieder
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