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1. 发明授权

US4997272A 4.pi. laser Doppler anemometer (LDA) for measuring the velocities of moving objects 失效
标题翻译： 4 pi激光多普勒风速计（LDA），用于测量移动物体的速度
公开(公告)号：US4997272A
公开(公告)日：1991-03-05
申请号：US326981
申请日：1989-03-22
申请人： Dietrich Dopheide , Michael Faber , Gerhard Reim , Gunter Taux
发明人： Dietrich Dopheide , Michael Faber , Gerhard Reim , Gunter Taux
IPC分类号： G01P5/26
CPC分类号： G01P5/26
摘要： Laser Doppler anemometer with a wavelength-stabilized laser diode (1) whose beam after splitting (7) is so concentrated in a definite area (9) of a particle-containing flow of a fluid with the velocity (17) that in this area (9) an interference fringe pattern is produced, and with at least one semiconductor photodiode (13) on which the laser beams (10, 11) progressing from the area (9) are refocussed after elimination of scattered light fractions by a scattered light trap (diaphragm stop) (14), for the detection of the difference signal I between incident light intensity I.sub.o and scattered light intensity I.sub.scatter which the particles contained in the fluid emit into the whole solid angle 4.pi., where I=I.sub.o -I.sub.scatter. By detection of the laser beam of the intensity I which is modulated with the Doppler frequency after having passed through the point of measurement (9), the whole light intensity I.sub.scatter emitted by the particle into the solid angle 4.pi. can be utilized for the signal-to-noise ratio at the photodetector, and if suitable semiconductor photodiodes are used, the direction of flow can be identified.
摘要翻译：具有波长稳定的激光二极管（1）的激光多普勒风速计（1），其分束后的光束（7）如此集中在流体的含颗粒流动的确定区域（9）中，速度（17）在该区域 9）产生干涉条纹图案，并且在从由区域（9）射出的激光束（10,11）上的至少一个半导体光电二极管（13）在通过散射光阱消除散射光分数之后被重新聚焦（光阑停止）（14），用于检测入射光强度Io和流体中包含的粒子的散射光强度散度之间的差分信号I发射到整个立体角4π，其中I = Io-Iscatter。通过检测在通过测量点（9）后用多普勒频率调制的强度I的激光束，由粒子发射的立体角4π的整个光强度散射可用于信号在光电检测器上的噪声比，并且如果使用合适的半导体光电二极管，则可以识别流动的方向。

2. 发明授权

US4940330A Laser Doppler anemometer 失效
标题翻译：激光多普勒风速计
公开(公告)号：US4940330A
公开(公告)日：1990-07-10
申请号：US226925
申请日：1988-08-01
申请人： Dietrich Dopheide , Michael Faber , Guenter Taux , Gerhard Reim
发明人： Dietrich Dopheide , Michael Faber , Guenter Taux , Gerhard Reim
IPC分类号： G01F1/66 , G01P5/26 , H01S5/024 , H01S5/40
CPC分类号： H01S5/4025 , G01F1/661 , G01P5/26
摘要： A laser Doppler anemometer includes at least a first and second laser source, an optical system for directing laser beams from the sources to a specific region of a fluid flow containing particles in order to produce a virtual interference fringe pattern and at least one photodetecter positioned for receiving the scattered light from the flowing fluid. At least one of a temperature regulation and current regulation circuit is provided for stabilizing the wavelength of at least one of the laser sources. The first and second laser sources are set to different emission wavelengths and a regulating circuit is provided for maintaining the difference frequency between the first and second sources constant. The difference frequency is in turn utilized to control the temperature regulation and/or current regulation circuit for at least one of the laser sources to achieve stabilized operation thereof.
摘要翻译：激光多普勒风速计至少包括第一和第二激光源，用于将来自源的激光束引导到含有颗粒的流体流的特定区域的光学系统，以便产生虚拟干涉条纹图案和至少一个光电探测器，接收来自流动流体的散射光。提供了用于稳定至少一个激光源的波长的温度调节和电流调节电路中的至少一个。将第一和第二激光源设置为不同的发射波长，并且提供调节电路以保持第一和第二源之间的差频恒定。另外，差分频率又用于控制至少一个激光源的温度调节和/或电流调节电路，以实现其稳定的操作。

3. 发明授权

US4974960A Laser doppler anemometer using high-frequency laser pulses 失效
标题翻译：激光多普勒风速仪采用高频激光脉冲
公开(公告)号：US4974960A
公开(公告)日：1990-12-04
申请号：US226703
申请日：1988-08-01
申请人： Dietrich Dopheide , Michael Faber , Guenter Taux , Hans-Joachim Pfeifer , Gerhard Reim
发明人： Dietrich Dopheide , Michael Faber , Guenter Taux , Hans-Joachim Pfeifer , Gerhard Reim
IPC分类号： G01P5/26
CPC分类号： G01P5/26
摘要： A laser Doppler anemometer with at least two laser beams pass to a region of a fluid flow containing particles. The scattered light is frequency shifted by the Doppler frequency resulting from the flow speed. The construction is very compact and permits a high signal-to-noise ratio for the measurement signals. The laser beams consist of high-frequency pulses, the frequency of the pulse sequence of which is a multiple of the Doppler frequency.
摘要翻译：具有至少两个激光束的激光多普勒风速计通过含有颗粒的流体流的区域。散射光由流速引起的多普勒频率偏移。该结构非常紧凑，允许测量信号的高信噪比。激光束由高频脉冲组成，其脉冲序列的频率是多普勒频率的倍数。

4. 发明授权

US4923298A Device for measuring the speed of moving light-scattering objects 失效
标题翻译：用于测量移动的光散射物体的速度的装置
公开(公告)号：US4923298A
公开(公告)日：1990-05-08
申请号：US194239
申请日：1988-05-16
申请人： Dietrich Dopheide , Michael Faber , Gerhard Reim , Guenter Taux
发明人： Dietrich Dopheide , Michael Faber , Gerhard Reim , Guenter Taux
IPC分类号： G01P5/00 , G01P3/36 , G01P5/26
CPC分类号： G01P5/26
摘要： In a device for measuring the speed of moving light-scattering objects by means of laser beams, with which a periodic intensity distribution (4) is produced at the measuring point (3), and by means of a detecting device (5, 7; 8, 9, 10) for light scattered by the object, it is possible to produce the periodic intensity distribution in a simple fashion with a laser diode array (1) in which a plurality of laser diodes are arranged at a defined separation from one another. Light emitted by the laser diode is focussed at the measuring point (3) with a focusing optical system (2). In addition, when measuring speed it is possible to discriminate direction by arranging the laser diode array (1, 13) such that no emission occurs in at least one such location (11') of the laser diode (11), so that an asymmetric intensity distribution is produced at the measuring point (3).
摘要翻译：在用于通过激光束测量移动的光散射物体的速度的装置中，在测量点（3）处产生周期性强度分布（4），并借助于检测装置（5,7; 对于由物体散射的光，可以用激光二极管阵列（1）以简单的方式产生周期性强度分布，其中多个激光二极管彼此间隔开分开设置。激光二极管发射的光利用聚焦光学系统（2）聚焦在测量点（3）处。此外，当测量速度时，可以通过布置激光二极管阵列（1,13）来区分方向，使得在激光二极管（11）的至少一个这样的位置（11'）中不发生发射，使得不对称在测量点（3）产生强度分布。

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