Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

MICROTHERMAL INSTRUMENT FOR MEASURING SURFACE LAYER SEEING

  • Li, Xue-Bao (Yunnan Astronomical Observatory, Chinese Academy of Sciences) ;
  • Zheng, Yan-Fang (Yunnan Astronomical Observatory, Chinese Academy of Sciences) ;
  • Deng, Lin Hua (Yunnan Astronomical Observatory, Chinese Academy of Sciences) ;
  • Xu, Guang (Yunnan Astronomical Observatory, Chinese Academy of Sciences)
  • Received : 2011.11.09
  • Accepted : 2012.01.05
  • Published : 2012.02.29
Download PDF
⟨ Previous Next ⟩

Abstract

Microthermal fluctuations are introduced by atmospheric turbulence very near the ground. In order to detect microthermal fluctuations at Fuxian Solar Observatory (FSO), a microthermal instrument has been developed. The microthermal instrument consists of a microthermal sensor, which is based on a Wheatstone bridge circuit and uses fine tungsten filaments as resistance temperature detectors, an associated signal processing unit, and a data collection, & communication subsystem. In this paper, after a brief introduction to surface layer seeing, we discuss the instrumentation behind the microthermal detector we have developed and then present the results obtained. The results of the evaluation indicate that the effect of the turbulent surface boundary layer to astronomical seeing would become sufficiently small when installing a telescope at a height of 16m or higher from the ground at FSO.

Keywords

References

  1. Aristidi, E., Agabi, A., Vernin, J., Azouit, M., Martin, F., Ziad, A., & Fossat. E. 2003, First Daytime Seeing Monitoring at Dome C, Mem. S. A. It. Suppl., 146, 149
  2. Aristidi, E., Agabi, A., Fossat, E., Azouit, M., Martin, F., Sadibekova, T., Travouillon, T., Vernin, J., & Ziad, A. 2005, Site Testing in Summer at Dome C, Antarctica, A&A, 651, 659
  3. Barletti, R., Ceppatelli, G., Moroder, E., Paterno, L., & Righini, A. 1974, A Vertical Profile of Turbulence in the Atlantic Air MassMeasured by Balloon-Borne Radiosondes, J. Geophys. Res., 4545, 4549
  4. Bayanna, A. R., Kumar, B., Louis, R. E., Venkatakr- ishnan, P., & Mathew, S. K. 2008, Development of a Low-Order Adaptive Optics System at Udaipur Solar Observatory, J. Astrophys. Astr., 353, 357
  5. Dierickx, P. 1992, Optical Performance of Large Ground-Based Telescopes, J. Mod. Opt., 569, 588
  6. Echevarria, J., Tapia, M., Costero, R., Salas, L., Michel, Rm., Michel, Rl., Rojas, M. A., Valdez, J., Ochoa, J. L., Palomares, J., Harris, O., Cromwell, R. H., Woolf, N. J., Persson, S. E., & Carr, D. M. 1998, Site Testing at Observatorio Astronomico Nacional in San Pedro Martir, ReMexAA, 34, 47
  7. Fried, D. L. 1966, Optical Resolution Through a Randomly Inhomogeneous Medium for Very Long and Very Short Exposures, J. Opt. Soc. Am., 1372, 1379
  8. Gosain, S., Tiwari, S., Joshi, J., & Venkatakrishnan, P. 2008, Software for Interactively Visualizing Solar Vector Magnetograms of Udaipur Solar Observatory, J. Astrophys. Astr., 107, 111
  9. Gupta, S. K., Mathew, S. K., & Venkatakrishnan, P. 2006, Development of Solar Scintillometer, J. Astrophys. Astr., 315, 320
  10. Iye, M., Nishihara, E., & Hayano, Y. 1992, Differential Dome-Seeing Monitor, PASP, 760, 767
  11. Jorgensen, A. M., Klinglesmith, D. A., Speights, J., Clements, A., & Patel, J. 2009, Design and Test of an Instrument for Measuring Microthermal See- ing on the MAGDALENA RIDGE, Astron. J., 4091, 4099
  12. Marks, R. D, Vernin, J., Azouit, M., Briggs, J. W., Burton, M. G., Ashley, M. C. B., & Manigault, J. F. 1996, Proposed Microthermal Measurements at Devasthal, Astron. Astrophys. Suppl. Ser., 118, 385 https://doi.org/10.1051/aas:1996205
  13. Marks, R. D., Vernin, J., Azouit, M., Briggs, J. W., Burton, M. G., Ashley, M. C. B., & Manigault, J. F. 1996, Antarctic Site Testing-Microthermal Measurement of Surface-Layer Seeing at the South Pole, Astron. Astrophys. Suppl. Ser., 385, 390
  14. Marks, R. D., Vernin, J., Azouit, M., Manigult, J. F., & Clevelin, C. 1999, Measurement of Optical Seeing on the High Antarctic Plateau, Astron. Astrophys. Suppl. Ser., 161, 172
  15. Obukhov, A. M. 1949, Structure of the Temperature Field in a Turbulent Flow, Ser Geograf. Geofiz., 13, 58
  16. Pant, P., Stalin, C. S., & Sagar, R. 1999, Microthermal Measurements of Surface Layer Seeing at Devasthal Site, Astron. Astrophys. Suppl. Ser., 19, 25
  17. Roddier, F. 1981, The Effects of Atmospheric Turbulence in Optical Astronomy, Pro. Opt., 281, 376
  18. Sanchez, L. J., Cruz, D. X., Avila, R., Agabi, A., Azouit, M., & Voitsekhovich, V. V. 2003, Contribution of the Surface Layer to the Seeing at SAN PEDRO MARTIR: Simultaneous microthermal and DIMM Measurements, ReMexAA, 23, 30
  19. Tatarski, V. I. 1961, Wave Propagation in a Turbulent Medium, New Series, 324, 325