中国物理B ›› 2009, Vol. 18 ›› Issue (3): 922-926.doi: 10.1088/1674-1056/18/3/014

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Noise in a coupling electromagnetic detecting system for high frequency gravitational waves

仲元红1, 李瑾2, 李芳昱2   

  1. (1)Department of Communication, Chongqing University, Chongqing 400030, China; (2)Department of Physics, Chongqing University, Chongqing 400030, China
  • 收稿日期:2008-07-01 修回日期:2008-08-03 出版日期:2009-03-20 发布日期:2009-03-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2003CB716300), the National Natural Science Foundation of China (Grant No 10575140), and CAEP Foundation (Grant Nos 2008 T0401 and 2008 T0402).

Noise in a coupling electromagnetic detecting system for high frequency gravitational waves

Li Jin(李瑾)a), Li Fang-Yu(李芳昱)a)†, and Zhong Yuan-Hong(仲元红)b)‡   

  1. a Department of Physics, Chongqing University, Chongqing 400030, China; b Department of Communication, Chongqing University, Chongqing 400030, China
  • Received:2008-07-01 Revised:2008-08-03 Online:2009-03-20 Published:2009-03-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2003CB716300), the National Natural Science Foundation of China (Grant No 10575140), and CAEP Foundation (Grant Nos 2008 T0401 and 2008 T0402).

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摘要： This paper discusses the basic categories of noise in detecting high frequency gravitational waves in the microwave band (～0.1--10 GHz), which contain shot noise from the laser and the thermal radiation photons, thermal noise from statistical fluctuation of the thermal photons and fluctuation of the temperature, radiation press noise on the fractal membrane, the noise caused by the scattering of the Gaussian Beam (GB) in the detecting tube and noise in the microwave radiometers. The analysis shows that a reasonable signal-to-noise ratio may be achieved for a detecting device with the fixed power of GB (105 W), only when the temperature of the environment is no more than T=1 K, and the optimal length of the microwave radiometers is about 0.3 m.

关键词: high frequency gravitational waves, shot noise, radiation press noise, fractal membrane

Abstract: This paper discusses the basic categories of noise in detecting high frequency gravitational waves in the microwave band (～0.1--10 GHz), which contain shot noise from the laser and the thermal radiation photons, thermal noise from statistical fluctuation of the thermal photons and fluctuation of the temperature, radiation press noise on the fractal membrane, the noise caused by the scattering of the Gaussian Beam (GB) in the detecting tube and noise in the microwave radiometers. The analysis shows that a reasonable signal-to-noise ratio may be achieved for a detecting device with the fixed power of GB (105 W), only when the temperature of the environment is no more than T=1 K, and the optimal length of the microwave radiometers is about 0.3 m.

Key words: high frequency gravitational waves, shot noise, radiation press noise, fractal membrane

中图分类号:  (Gravitational wave detectors and experiments)

  • 04.80.Nn
95.55.Ym (Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques)