Laser radar device
文献类型：专利
| 作者 | KREMER, RICHARD, M.; KOREVAAR, ERIC, T.; BLOOM, SCOTT |
| 发表日期 | 1993-02-18 |
| 专利号 | WO1993003384A1 |
| 著作权人 | THERMO ELECTRON TECHNOLOGIES, CORPORATION |
| 国家 | 世界知识产权组织 |
| 文献子类 | 发明申请 |
| 其他题名 | Laser radar device |
| 英文摘要 | A laser radar system capable of measuring windspeed to within 1 m/s at distances in the range of 10 km. The system comprises two Faraday atomic line filter/detectors combinations (66, 70; 68, 72), a first filter-detector which consists of a metal vapor cell (2) located between crossed polarizers (4, 6). A magnetic field is applied to the cell which Zeeman splits the energy levels resulting in different absorption lines for left and right circularly polarized light. Near these lines the filter acts a a Faraday rotator providing rotary power only in the vicinity of an abosorption line, which provides the 90 degree rotation necessary to pass the second polarizer. At higher fields and vapor densities multiple rotations lead to rapid modulation in the transmission spectrum. Away from the absorption line the filter provides an out of band rejection that is determined by the extinction ratio of the crossed polarizers. By tuning the temperature and the magnetic field in each Faraday filter sharply crossing response curves can be produced. A preferred lasing frequency range is a frequency range covering a portion of one of the slopes of the peak of the first filter and a portion of one of the opposite direction slopes of one of the peaks of the second filter. Within this range an increase in the frequency of signal light will result in a greater fraction of the light detected by one filter-detectors and a smaller fraction detected by the other filter-detector and a decrease in the frequency of the signal light will have the opposite effect. In a preferred embodiment of this invention laser pulses from a laser (52, 54) operating near the midpoint of this preferred frequency range are beamed at a target which could be a windy portion of the atmosphere. Backscattered Doppler shifted light from aerosols and particles in the atmosphere are collected by a telescope (62) and split into two parts, one part being directed to each filter-detector. The intensities of the light detected by the filter-detectors are compared and the relative magnitudes are used to determine the windspeed in the direction of the laser beam. Pulses can be made very short and the travel time of the light is used to determine the range so that a map of windspeed as a function of range is provided in the direction of the laser beam. |
| 公开日期 | 1993-02-18 |
| 申请日期 | 1992-05-29 |
| 状态 | 未确认 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/62433]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | THERMO ELECTRON TECHNOLOGIES, CORPORATION |
| 推荐引用方式 GB/T 7714 | KREMER, RICHARD, M.,KOREVAAR, ERIC, T.,BLOOM, SCOTT. Laser radar device. WO1993003384A1. 1993-02-18. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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