排序方式: 共有7条查询结果,搜索用时 250 毫秒
1
1.
A new technology of lightning location is described, which is based on detecting the state of polarization (SOP) fluctuation of the laser light in the optic ground wire (OPGW). Compared with the conventional lightning location method, the new method is more accurate, more stable, and cheaper. Theories of Stokes parameters and Poincare sphere are introduced to analyze the SOP at the lightning strike point. It can be concluded that although the initial points of SOP on the Poincare sphere are random, the SOP fluctuation generated by lightning strike can still be accurately identified by detecting the velocity of polarization motion. A new algorithm to quantify the velocity is also introduced. 相似文献
2.
A micro-Gal absolute gravimeter based on high-precision and high-stability heterodyne interferometer is presented.The distance measuring technology of the gravimeter is studied in detail.The experimental results of distance measuring for a free-falling motion show that the high-precision heterodyne interfer- ometer described in this paper can meet the demand of a micro-Gal absolute gravimeter with relative uncertainty of 6.4×10~(-9).Moreover,the heterodyne interferometer is more stable than the Mach-Zehnder interferometer(MZI)which is widely used in present absolute gravimeters. 相似文献
3.
4.
5.
6.
There is an increasing demand on the measurable velocity of laser interferometer in manufacturing tech- nologies.The maximum measurable velocity is limited by frequency difference of laser source,optical configuration,and electronics bandwidth.An experimental setup based on free falling movement has been demonstrated to measure the maximum measurable velocity for interferometers.Measurement results show that the maximum measurable velocity is less than its theoretical value.Moreover,the effect of kinds of factors upon the measurement results is analyzed,and the results can offer a reference for industrial ap- plications. 相似文献
7.
1