Terahertz Superconducting Radiometric Spectrometer in Tibet for Atmospheric Science
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Terahertz superconducting radiometric spectrometer (TSRS), as one of seven instruments of the atmospheric profiling synthetic observation system (APSOS) project, was completed in the middle of 2017 after 5 years of development. It is a dual-band heterodyne receiver system based on high sensitive superconductor-insulator-superconductor (SIS) mixers which cover the frequency range of 180 to 380 GHz. With fast Fourier transform spectrometer (FFTS) of each band, real-time observation of 2 GHz bandwidth of high spectral resolution atmospheric molecular emission lines has been demonstrated. TSRS has been deployed at Yangbajing site, which stands on the Qinghai-Tibet Plateau at an altitude of 4300 m in southwestern China, since October 2017. It has been worked in a preliminary observation phase along with other active observation equipment of APSOS. Since then, ozone emission lines around 236 GHz and 358 GHz have been monitored simultaneously. Achieved data will be used to retrieve the in situ vertical distribution of ozone and its movement among different layers of the atmosphere.
KeywordsTerahertz Superconducting Heterodyne receiver Molecular emission lines
The authors would like to thank Xuguo Zhang and Weilin Pan for their help at Delingha observatory and Yangbajing site during the in situ observations. We would also like to thank Ming-Jye Wang and his teammates for the help of SIS mixer fabrication.
This work was supported by the National Natural Science Foundation of China under Grant 41127901 and 11503094, and in part by the CAS Joint Key Lab for Radio Astronomy.
- 1.D. R. Lu, W. L. Pan, and Y. N. Wang, Atmospheric profiling synthetic observation system in Tibet, Adv. Atmos. Sci. 35 (2018), no. 3, 264–267.Google Scholar
- 2.T. G. Phillips and J. Keene, Submillimeter astronomy, Proc. IEEE 96 (1992), no. 2, 287–305.Google Scholar
- 3.L. S. Rothman and et al., The HITRAN 2008 molecular spectroscopic database, J. Quant. Spectrosc. Radiat. Transfer 110 (2009), no. 9-10, 533–572.Google Scholar
- 4.S. Paine, The am atmospheric model, Submillimeter Array Technical Memo, No. 152 Mar, 2018.Google Scholar
- 5.J. R. Pardo, J. Cernicharo, and E. Serabyn, Atmospheric transmission at microwaves (ATM): an improved model for millimeter/submillimeter applications, IEEE Trans. Antennas Propag. 49 (2001), no. 12, 1683–1694.Google Scholar
- 6.D. M. Slocum, E. J. Slingerland, R. H. Giles, and T. M. Goyette, Atmospheric absorption of terahertz radiation and water vapor continuum effects, J. Quant. Spectrosc. Radiat. Transfer 127 (2013), 49–63.Google Scholar
- 7.Y. H. Yang, A. Shutler, and D. Grischkowsky, Measurement of the transmission of the atmosphere from 0.2 to 2 THz, Opt. Express 19 (2011), no. 9, 8830–8838.Google Scholar
- 8.M. F. Zhou, Q. J. Yao, Z. Q. Luo, and J. Yang, Measurements of 460 GHz atmospheric opacity at Yangbajing observational station, Chin. J. Astron. Astrophys. 35 (2011), no. 3, 327–338.Google Scholar
- 9.J. Säily and A.V. Räisänen, Studies on specular and non-specular reflectivities of radar absorbing materials (RAM) at submillimetre wavelengths, Helsinki University of Technology, Report S 258 Feb, 2003.Google Scholar
- 10.T. Noguchi, S.C. Shi, and J. Inatani, An SIS mixer using two junctions connected in parallel, IEEE Trans. Appl. Supercond. 5 (1995), no. 2, 2228–2231.Google Scholar
- 11.M. J. Wengler, N. B. Dubash, G. Pance, and R. E. Miller, Josephson effect gain and noise in SIS mixers, IEEE Trans. Microwave Theory Tech. 40 (1992), no. 5, 820–826.Google Scholar
- 12.T. Kojima and et al., A low-noise terahertz SIS mixer incorporating a waveguide directional coupler for LO injection, J. Infrared, Millimeter, Terahertz Waves 31 (2010), no. 11, 1321–1330.Google Scholar
- 13.J. G. Proakis and D. G. Manolakis, Digital signal processing: principles algorithms and applications, 3rd ed., Prentice-Hall, New Jersey, 1996.Google Scholar
- 14.J. W. Kooi, G. Chattopadhyay, M. Thielman, and T. G. Phillips, Noise stability of SIS receivers, Int. J. Infrared Millimeter Waves 21 (2000), no. 5, 689–716.Google Scholar
- 15.T. L. Wilson, Kristen Rohlfs, and S. Hüttemeister, Tools of radio astronomy, 5th ed., Springer-Verlag, Berlin, 2009.Google Scholar
- 16.A. Murk and N. Kämpfer, Baseline issues in an airborne 650 GHz Radiometer, COST-712 Microw. Tech. Meteorol. Workshop, pp. 42-51 Dec, 1999.Google Scholar