標題: | The application of laser metrology and resonant optical cavity techniques to the measurement of G |
作者: | Ni, WT Liu, DK Liu, TT Mei, HH Pan, SS Pan, CP Yeh, HS 物理研究所 Institute of Physics |
關鍵字: | gravitational constant;Fabry-Perot interferometer;laser metrology;fundamental constant;fundamental physics |
公開日期: | 1-六月-1999 |
摘要: | Our goal is to measure the gravitational constant G to within 1-10 ppm using a high-finesse Fabry-Perot optical cavity. The two high-reflectivity mirrors of the Fabry-Perot cavity will be suspended separately by two nearly identical simple pendulums of length about 1 m. For the source of attraction, we have built a rotating mass source with 12 lead bricks (each brick is of mass 11.5 kg) on each of two opposite sides of a rotating table. The period of rotation can be adjusted. We normally use a rotation period of 200 s. For this rotating mass, the relative equilibrium displacement of the two mirrors is over 10 nm and we are working for a preliminary measurement of this distance to one part in 10(4). Auxiliary quantities such as the positions of the test mass and the positions of Fabry-Perot cavity mirrors can be monitored using real-time laser metrology. The stability and real-time monitoring of the pendulums, building stability, and the compensation or averaging of mass inhomogeneity need special considerations. |
URI: | http://dx.doi.org/10.1088/0957-0233/10/6/314 http://hdl.handle.net/11536/31329 |
ISSN: | 0957-0233 |
DOI: | 10.1088/0957-0233/10/6/314 |
期刊: | MEASUREMENT SCIENCE & TECHNOLOGY |
Volume: | 10 |
Issue: | 6 |
起始頁: | 495 |
結束頁: | 498 |
顯示於類別: | 會議論文 |