Program and Abstract Book - SRON

More documents

Recommendations

Info

19 th International Symposium on Space Terahertz Technology 10-5 Development of a Waveguide-Type Dual-polarization Sideband-Separating SIS Receiver System in 100 GHz Band for the NRO 45-m Radio Telescope Taku Nakajima 1 Masayuki Kawamura 1 Kimihiro Kimura 1 Yoshinori Yonekura 1 Hideo Ogawa 1 Takeshi Sakai 2 Nario Kuno 2 Masato Tsuboi 3 Shin’ichiro Asayama 4 Takashi Noguchi 4 Ryohei Kawabe 2 1. Department of Physical Science, Graduate School of Science, Osaka Prefecture University 2. Nobeyama Radio Observatory, National Astronomical Observatory of Japan 3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency 4. Advanced Technology Center, National Astronomical Observatory of Japan We have developed a waveguide-type dual-polarization sideband-separating SIS receiver system in 100 GHz band for the 45-m radio telescope at the Nobeyama Radio Observatory, Japan. The new receiver uses a waveguide-type Ortho-Mode Transducer (OMT) and two Sideband-Separating (2SB) SIS mixers (Fig.1). The SSB receiver noise temperature with 4.0-8.0 GHz IF, including the noise contribution from the vacuum window, the feed horn, and the IF amplifier chain, are measured to be lower than 100 K over the RF range of 75-120 GHz, and the minimum value of ~ 45 K is achieved at around 95 GHz. The mean value and standard deviation between RF frequency range of 75-106 GHz in the LSB and 79-120 GHz in the USB are 68 13 K and 66 9 K, respectively (Fig.2 (a)). The measured IRR was better than 10 dB over the RF range of 80-123GHz. The mean value between RF frequency range of 80-111 GHz in the LSB and 84-123 GHz in the USB are 20 dB and 19 dB, respectively (Fig.2 (b)). The new receiver system has been installed in the telescope, and we successfully detected the molecular lines over the RF range of 80-116 GHz toward Orion KL in 2007 December. These are the first astronomical observations with the waveguide-type dual-polarization sideband-separating SIS receiver system in the 100 GHz band. A molecular line survey using this receiver system has already begun. 200 40 150 USB LSB 30 USB LSB 100 20 50 10 0 70 80 90 100 110 120 130 RF Frequency [GHz] 0 70 80 90 100 110 120 130 RF Frequency [GHz] 86
19 th International Symposium on Space Terahertz Technology A modular 16-pixel terahertz imager system applying superconducting microbolometers and room temperature read-out electronics M. Leivo 1 , P. Helistö 1 , A. Luukanen 2 , J.S. Penttilä 3 , T. Perälä 1 , A. Rautiainen 1 , H. Toivanen 1 , C.R. Dietlein 4 , and E.N. Grossman 4 1 VTT, Sensors, Espoo, Finland 2 Millimeter-wave Laboratory of Finland, Espoo, Finland 3 Aivon Oy, Espoo, Finland 4 National Institute of Standards and Technology, Optoelectronics Division, Boulder, CO, USA 10-6 Superconducting bolometers have long been used as the "work horse" technology for terahertz astrophysics. In this paper we describe a system developed for stand-off imaging of concealed weapons and explosives. The system utilizes an array of NbN antenna-coupled vacuum-bridge microbolometers as detectors. The detectors are modular, with 8 pixels incorporated within a single module. The modules are mounted onto the 2 nd cooling stage of a commercial cryogen-free pulse tube refrigerator with a base temperature of ca. 4 K. The readout of the sensors is carried out with an innovative room-temperature feedback preamplifier that can achieve bolometer noise limited performance when operated at the "inflexion point" of the voltage-biased bolometer. In the paper we will describe the overall architecture of the modular system, describe the electrical and optical performance characteristics of the system, and show passive imagery of test objects acquired in the 200 GHz to 1 THz band. The system is a precursor for a video-rate imaging THz camera, which will be briefly discussed. Fig. 1. Left) Overall setup of a 16-pixel THz imager system. Center) Two bolometer modules attached to pulse tube cold finger. Right) Micrograph of an antenna-coupled vacuum-bridge microbolometer array. 87
Page 1 and 2:
ISSTT 2008 19 th International Symp
Page 3 and 4:
19 th International Symposium on Sp
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38: 19 th International Symposium on Sp
Page 87: 19 th International Symposium on Sp
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
show all

Program and Abstract Book - SRON

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?