公开(公告)号：US06597505B1

公开(公告)日：2003-07-22

申请号：US09700198

申请日：2000-11-13

申请人： Raymond J Chaney ,  Mark A V Chapman ,  Tingdi Liao ,  Jan Linnenbuerger ,  Damon M Northeast

发明人： Raymond J Chaney ,  Mark A V Chapman ,  Tingdi Liao ,  Jan Linnenbuerger ,  Damon M Northeast

IPC分类号： G02B530

CPC分类号： G01B9/02007 ,  G01B9/02021 ,  G01B9/02058 ,  G01B9/02067 ,  G01B2290/70 ,  G02B6/4207 ,  G02B6/4216

摘要： Apparatus for producing and guiding a light beam, in particular for a laser interferometer, includes a laser having a laser tube (100) and an external cavity (112). Two laser beams (110A′ and 110B′) of orthogonal polarization states are directed from the cavity into polarization maintaining fibers (12, 14). The two beams are generated from a single beam (110) by a birefringent prism (120) in the cavity. Additional beam steering prisms (130A and 130B) are included to direct the beams from the birefringent prism to the fibers. The additional steering prisms compensate for temperature induced beam deviations in the birefringent prisms. Interferometric sensing heads (20, 22) receive the beams from the fibers and include a rotatable wedge prism and mechanical adjustment means for guiding the beams onto reflecting surfaces on an object for positioning the object. The ends of the fibers attached to the sensing heads are kinematically located in the head.

摘要翻译： 用于产生和引导光束，特别是用于激光干涉仪的设备包括具有激光管（100）和外部空腔（112）的激光器。 正交极化状态的两个激光束（110A'和110B'）从空腔引导到偏振保持光纤（12,14）中。 两个光束通过空腔中的双折射棱镜（120）由单个光束（110）产生。 包括附加的光束导向棱镜（130A和130B）以将光束从双折射棱镜引导到光纤。 附加的转向棱镜补偿双折射棱镜中的温度感应光束偏差。 干涉测量头（20,22）从光纤接收光束并且包括可旋转的楔形棱镜和用于将光束引导到用于定位物体的物体上的反射表面上的机械调节装置。 附着在感测头上的纤维的端部运动地位于头部。

公开(公告)号：US06345060B1

公开(公告)日：2002-02-05

申请号：US09254709

申请日：1999-05-05

申请人： Nigel J Copner ,  Raymond J Chaney

发明人： Nigel J Copner ,  Raymond J Chaney

IPC分类号： H01S313

CPC分类号： H01S5/0687 ,  H01S3/13 ,  H01S3/139

摘要： The output frequency of a semiconductor laser beam is stabilized using a grating or another optical device which has an interaction with the beam whose parameters are sensitive to the beam frequency. The grating (130) generates positive and negative first order diffracted beams (132, 134), whose angle of diffraction is sensitive to the beam frequency, and is detected by split photodetectors AB, CD respectively. In the event of a change in beam frequency the outputs from the photodetectors AB, CD will vary to provide an error signal for the laser frequency. This error signal is insensitive to variations in angular alignment between the beam and the diffraction grating. This is because variations in frequency and variations in angular alignment cause different changes in the outputs of the photodetectors AB, CD.

摘要翻译： 半导体激光束的输出频率使用与参数对光束频率敏感的光束相互作用的光栅或另一光学装置来稳定。 光栅（130）产生衍射角对光束频率敏感的正负一阶衍射光束（132,134），分别由分裂光电检测器AB，CD检测。 在光束频率发生变化的情况下，来自光电检测器AB，CD的输出将变化以提供用于激光频率的误差信号。 该误差信号对光束和衍射光栅之间的角度对准的变化不敏感。 这是因为频率的变化和角度对准的变化引起光电探测器AB，CD的输出的不同变化。

公开(公告)号：US5818047A

公开(公告)日：1998-10-06

申请号：US793196

申请日：1997-02-20

申请人： Raymond J Chaney ,  David N Batchelder ,  Richard J Lacey

发明人： Raymond J Chaney ,  David N Batchelder ,  Richard J Lacey

IPC分类号： G01N21/65 ,  G08B21/00 ,  G01N33/22

CPC分类号： G01N21/65 ,  G01N21/658

摘要： The presence of Semtex plastic explosive in a sample such as a fingerprint is detected by Raman spectroscopy. RDX and PETN, the active chemical ingredients of Semtex, have strong Raman peaks at 885 cm.sup.-1 and 874 cm.sup.-1 respectively. Consequently, both these peaks can be detected in a Raman spectroscopic system by employing a filter having a narrow passband centered on 880 cm.sup.-1 and with a bandwidth of 20 cm.sup.-1. Such a filter is used in a Raman system used to scan airport boarding cards, or in a Raman microscope which produces images of fingerprints.

摘要翻译： PCT No.PCT / GB95 / 01979 Sec。 371日期1997年2月20日 102（e）1997年2月20日PCT PCT 1995年8月21日PCT公布。 公开号WO96 / 06346 日期1996年2月29日拉曼光谱法检测样品如指纹中的Semtex塑料炸药的存在。 RDX和PETN是Semtex的活性化学成分，分别在885 cm-1和874 cm-1处具有强拉曼峰。 因此，通过采用具有以880cm -1为中心且带宽为20cm -1的窄通带的滤波器，可以在拉曼光谱系统中检测这两个峰。 这种过滤器用于用于扫描机场登机卡的拉曼系统中，或在产生指纹图像的拉曼显微镜中。

公开(公告)号：US5975744A

公开(公告)日：1999-11-02

申请号：US680031

申请日：1996-07-15

申请人： Seamus McFadden ,  Raymond J Chaney

发明人： Seamus McFadden ,  Raymond J Chaney

IPC分类号： G01P3/36 ,  G01B9/02 ,  G01B11/00 ,  G01D3/00 ,  G05B19/404 ,  G06F19/00

CPC分类号： G05B19/404

摘要： A laser interferometer measuring system generates a series of digital output quadrature pulses corresponding to movement of a retroreflector 18. The output pulses are intended for receipt by a master counter containing an incremental count corresponding to displacement of the retroreflector 18. Errors present in the output pulses due to environmental or geometrical error sources in the interferometer may be compensated for by scaling the output pulses in accordance with a correction factor K. The output pulses are stored in a first counter 30, 130; a series of secondary pulses, being either the output pulses as scaled, or independently generated by a signal generator 200, are sent both to the master counter and a second counter 80, 180. A processor 50, 150 continually monitors the value of the second counter, and compares this with an actual value of displacement, equal to the product of the correction factor and the instantaneous value of the first counter. The frequency of secondary pulses transmitted to the master counter and the second counter is continually controlled by the processor in order to equalize the value of the second counter with the actual displacement value.

摘要翻译： 激光干涉仪测量系统产生对应于后向反射器18的运动的一系列数字输出正交脉冲。输出脉冲用于由包含对应于后向反射器18的位移的增量计数的主计数器接收。输出脉冲中存在的错误 由于干涉仪中的环境或几何误差源可以通过根据校正因子K对输出脉冲进行缩放来补偿。输出脉冲存储在第一计数器30,130中; 作为缩放的输出脉冲或由信号发生器200独立地产生的一系列次级脉冲被发送到主计数器和第二计数器80,180。处理器50,150连续监视第二个脉冲的值 计数器，并将其与实际的位移值进行比较，等于校正因子与第一个计数器的瞬时值的乘积。 发送到主计数器和第二计数器的二次脉冲的频率由处理器持续控制，以便将第二计数器的值与实际位移值相等。