SNODAR (Surface layer NOn-Doppler Acoustic Radar),用于测量南极高原上的大气边界层的高度和强度。南极高原的大气边界层的性质对于想放置未来光学望远镜的天文学家和大气学家都很重要。 SNODAR 发射一个强声波,然后探测其散射,以此了解温度梯度和风差。其工作原理很类似著名的水下探测技术 SONAR.
数据从2008年2月10日开始,显示其工作正常,提供了清晰的边界层测量结果。每日变化都很清晰。
声雷达SNODAR最小取样高度是5米,范围至少100米,垂直方向解析度达到1米。 SNODAR工作频率是从5kHz 到15kHz。这样的高频在南极的低温大气中传播相对比较理想。
SNODAR 1 at Dome A
每周更新的snodar数据图,显示边界层分离。图中纵轴范围是0至100米,横轴是12小时。
SNODAR用单喇叭接收和发射装置, 1.5米轴外碟型天线校准声波。信号要用USB声卡。PC/104电脑实时转化信号。SNODAR自动运行,将原始数据存放在USB盘里,下一年夏季取回,同时通过铱星上载。铱星也用于实现远程操作
SNODAR盘和压缩驱动(credit: Colin Bonner)
SNODAR通过一个围栏消除背景噪声。围栏内部能吸收机会所有可能干扰内部的声波频率。
Refereed papers from Snodar
- C. S. Bonner, M.C.B. Ashley, X. Cui, L. Feng, X. Gong, J.S. Lawrence, D.M. Luong-Van, Z. Shang, J.W.V. Storey, L. Wang, H. Yan, J. Yang, X. Zhou and Z. Zhu, Thickness of the Atmospheric Boundary Layer Above Dome A, Antarctica, during 2009, Publications of the Astronomical Society of the Pacific, 122, (2010), 1122–1131.
- Yang, H., Allen, G., Ashley, M.C.B., Bonner, C.S., Bradley, S., Cui, X., Everett, J.R., Feng, L., Gong, X., Hengst, S., Hu, J., Jiang, Z., Kulesa, C.A., Lawrence, J.S., Li, Y., Luong-Van, D., McCaughrean, M.J., Moore, A.M., Pennypacker, C., Qin, W., Riddle, R., Shang, Z., Storey, J.W.V., Sun, B., Suntzeff, N., Tothill, N.F.H., Travouillon, T., Walker, C.K., Wang, L., Yan, J., Yang, J., York, D., Yuan, X., Zhang, X., Zhang, Z., Zhou, X., and Zhu, Z., The PLATO Dome A Site-Testing Observatory: Instrumentation and First Results, Publications of the Astronomical Society of the Pacific, 121, (2009), 174–184.
- C.S. Bonner, M.C.B. Ashley, J.S. Lawrence, D.M. Luong-Van, J.W.V. Storey, Snodar: An acoustic radar for atmospheric turbulence profiling with 1m resolution, Acoustics Australia, 37, No. 2, (2009), 47–51.
SPIE instrumentation papers from Snodar
- Colin S. Bonner, Michael C. B. Ashley, Stuart G. Bradley, Xiangqun Cui, LongLong Feng, Xuefei Gong, Jon S. Lawrence, Daniel M. Luong-Van, Zhaohui Shang, John W. V. Storey, Lifan Wang, Huigen Yang, Ji Yang, Xu Zhou, and Zhenxi Zhu, Snodar: 2009 performance at Dome A, Antarctica, Proc. SPIE, in press.
- C.S. Bonner, M.C.B. Ashley, J.S. Lawrence, J.W.V. Storey, D.M. Luong-Van and S.G. Bradley, Snodar: a new instrument to measure the height of the atmospheric boundary layer on the Antarctic plateau, Proc. SPIE, 7014, (2008), 70146I– 70146I-7.
Conference proceedings from Snodar
- J.S. Lawrence, M.C.B. Ashley, C.S. Bonner, S. Bradley, D. Luong-Van, J.W.V. Storey, Characterisation of The Dome C atmospheric boundary layer turbulence with a non-Doppler acoustic radar, (Eds N. Epchtein and M. Candidi), EAS Publications Series, 25, (2007), 31–34.
- C.S. Bonner, M.C.B. Ashley, J.S. Lawrence, D.M. Luong-Van, and J.W.V. Storey, Snodar II: Probing the atmospheric boundary layer on the Antarctic Plateau, Conference Proceedings of the Imperial College Press World Scientific in press, (2008) , Sardegna, Italy, September, 2008.
联系人
主要设计者: Colin Bonner
主要监督者: Professor Michael Ashley
参与单位(按字母排序)
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University of Auckland, NZ |
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University of New South Wales, Australia |