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

作　　者：李瑾 李芳昱 仲元红 

机构地区：[1]Department of Physics,Chongqing University [2]Department of Communication,Chongqing University

出　　处：《Chinese Physics B》2009年第3期922-926,共5页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No 2003CB716300);the National Natural Science Foundation of China (Grant No 10575140);CAEP Foundation (Grant Nos 2008 T0401 and 2008 T0402)

摘　　要：This paper discusses the basic categories of noise in detecting high frequency gravitational waves in the microwave band （-0.1-10GHz）, 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=I K, and the optimal length of the microwave radiometers is about 0.3 m.This paper discusses the basic categories of noise in detecting high frequency gravitational waves in the microwave band （-0.1-10GHz）, 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=I 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 

分 类 号：X839.1[环境科学与工程—环境工程] P631.325[天文地球—地质矿产勘探]