专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5267010A Laser radar device 失效
公开(公告)号：US5267010A
公开(公告)日：1993-11-30
申请号：US710356
申请日：1991-05-31
申请人： Richard M. Kremer , Eric J. Korevaar , Scott H. Bloom
发明人： Richard M. Kremer , Eric J. Korevaar , Scott H. Bloom
IPC分类号： G01J3/12 , G01S7/486 , G01S17/95 , G02F2/02 , G01C3/08 , G01P3/36
CPC分类号： G01J3/12 , G01S17/95 , G01S7/4816 , G01S7/486 , G02F1/091 , G02F2/02 , G01J2003/1252
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, a first filter-detector which consist of a metal vapor cell located between crossed polarizers. 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 as a Faraday rotator providing rotary power only in the vicinity of an absorption line, which provides the 90 degree rotation necessary to pass the second polarizer. At higher fields and vapor densities multiple rotations lead to rapid modulations 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-detector 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 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 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.

2. 发明授权

US5029999A Laser radar device 失效
标题翻译：激光雷达设备
公开(公告)号：US5029999A
公开(公告)日：1991-07-09
申请号：US456975
申请日：1989-12-26
申请人： Richard M. Kremer , Eric I. Korevaar
发明人： Richard M. Kremer , Eric I. Korevaar
IPC分类号： G01J3/12 , G01N21/39 , G01S7/486 , G01S17/95 , G02F2/02
CPC分类号： G02F2/02 , G01J3/12 , G01S17/95 , G01S7/4816 , G01S7/486 , G01J2003/1252 , G01N2021/392 , G01S17/58
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 fast atomic line filter-detectors, a first filter-detector and a second filter-detector, in which a metal vapor is excited by signal light and further excited to a Rydberg level by a pump laser beam. An electric field is applied to the filters which ionizes the atoms. The filter-detectors operate at one of the resonance absorption peaks of the metal vapor. The second filter-detector is also subject to a magnetic field which splits the absorption peak of the vapor into two absorption peaks leaving a valley in the position of the original absorption peak. 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-detector 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 operating near the midpoint of the 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 split into two parts, one part being directed to each filter-detector. The intensities of the light detected by the filter-detector 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.
摘要翻译：激光雷达系统能够在10公里的距离内将风速测量到1米/秒以内。该系统包括两个快速原子线滤波器检测器，第一滤波器检测器和第二滤波器检测器，其中金属蒸气被信号光激发，并且通过泵激光束进一步激发到Rydberg电平。对电离原子的滤光片施加电场。过滤器检测器在金属蒸气的一个共振吸收峰处工作。第二个过滤器检测器还经受一个磁场，其将蒸汽的吸收峰分成两个吸收峰，在原始吸收峰的位置留下谷。优选的激光频率范围是覆盖第一滤波器的峰值的一个斜面的一部分和第二滤波器的一个峰值的相反方向斜率的一部分的一部分的频率范围。在该范围内，信号光的频率的增加将导致由一个滤波器检测器检测到的光的较大部分和由另一个滤波器检测器检测到的较小部分，并且信号光的频率的降低将具有相反的效果。在本发明的优选实施例中，来自在优选频率范围的中点附近操作的激光器的激光脉冲在可能是大气的大风部分的目标处被辐射。背散射多普勒从气溶胶中移动光，大气中的颗粒被分为两部分的望远镜收集，一部分被引导到每个过滤器检测器。比较由滤波器检测器检测到的光的强度，并使用相对幅度来确定激光束方向上的风速。可以使脉冲变得非常短，并且使用光的行进时间来确定范围，使得沿着激光束的方向提供作为范围的函数的风速的映射。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式