THE SEISMICS ISOLATION SYSTEM FOR ULTRA SENSITIVE INTERFEROMETER

• Main Authors: Lei Daw Yin, 尹樂道
• Other Authors: Chang Huei Wu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/69684649524752792506

碩士 === 元智大學 === 機械工程研究所 === 83 === The measure technology using laser interferometer has been all over applied to highly sensitive measurement.In order to correct the level of measurement we must subtract the noise resulting from the environment.Generally ,the seismic noise plays an important role among the noise of high sensitive measurement.In the other words the level of highly sensitive measure technology using laser interferometer mainly depend on the performance of seismic isolation.It's necessary to built a ultra-sensitive interferometer optician system to detect the different index of refraction between two polarization of vacuum under a strong magnetic filed in the Q&A experiment (a test of the Quantum Electrodynamics prediction of light retardation in the magnetic field and the search for scalar or pseudoscalar particles with small masses that can couple to two photons).An gravity wave reduction structure which make a pair of mirrors in the Fabry-Perot cavity hold on the fixed length (the t olerance must less than nanometer order) is requisite for the optician system.So should we develop a structure which can isolate seismic noise well in the experiment.At the first ,the paper will introduce the light retardation in the magnetic filed and how does the laser interferometer work in Q&A experiment,then the seismic Isolation structure will be discussed Clearly at chapter .The seismic Isolation is mainly combined by double pendulum machinery.The mechanical characteristics have advantage to noise suppression for high frequency,but is failed for low frequency.For the reason we must design an active servo loop to subtract the seismic noise. Finally,this paper will predict the seismic isolation effect by the result of simulation made by computer program.