公开(公告)号：US06621580B2

公开(公告)日：2003-09-16

申请号：US09971084

申请日：2001-10-03

申请人： Chris Myatt ,  Kurt Vogel

发明人： Chris Myatt ,  Kurt Vogel

IPC分类号： G01B902

CPC分类号： H01S5/0687 ,  G01J9/0246 ,  H01S5/005 ,  H01S5/0683

摘要： A wavelength locker includes a first beam splitter positioned in a beam path of an output beam produced by a laser. The first beam splitter splits the output beam into a first beam and a second beam. An interferometric optical element is optically contacted to the first beam splitter. The interferometric optical element receives the second beam from the first beam splitter and generates a third beam with an optical power that varies periodically with wavelength. A second beam splitter is positioned in a beam path of the first beam or in a beam path of an output beam produced by a laser, and creates a fourth beam. A first detector generates a first signal in proportion to an optical power of the third beam. A second detector generates a second signal in proportion to an optical power of the fourth beam. A wavelength of the output beam is adjusted in response to a comparison of the first and second signals and a predetermined reference signal level.

摘要翻译： 波长锁定器包括位于由激光器产生的输出光束的光束路径中的第一分束器。 第一分束器将输出光束分成第一光束和第二光束。 干涉光学元件与第一分束器光学接触。 所述干涉光学元件从所述第一分束器接收所述第二光束并产生具有随波长周期性变化的光焦度的第三光束。 第二分束器位于第一光束的光束路径中或位于由激光器产生的输出光束的光束路径中，并且产生第四光束。 第一检测器产生与第三光束的光功率成比例的第一信号。 第二检测器与第四光束的光功率成比例地产生第二信号。 响应于第一和第二信号与预定参考信号电平的比较来调整输出光束的波长。

公开(公告)号：US06621579B2

公开(公告)日：2003-09-16

申请号：US09816113

申请日：2001-03-26

申请人： Zongtao Ge

发明人： Zongtao Ge

IPC分类号： G01B902

CPC分类号： G01J9/02

摘要： In a fringe analysis method using Fourier transform, fringe image data is determined in a state where a wavefront from an object and a wavefront from a reference are relatively inclined with respect to each other by a minute amount, and a carrier fringe occurring due to this inclination is superposed on a fringe occurring due to wavefront information of the object. The inclination is set such that the carrier frequency occurring due to the inclination is a predetermined multiple of the basic frequency determined by the wavefront information of the object and observing means.

摘要翻译： 在使用傅立叶变换的边缘分析方法中，在来自物体的波前和来自基准的波前相对于彼此相对倾斜微小量的状态下确定条纹图像数据，并且由于该原因而发生的载波边缘 由于物体的波前信息，斜率叠加在边缘上。 斜率被设定为使得由于倾斜而发生的载波频率是由对象和观察装置的波前信息确定的基本频率的预定倍数。

公开(公告)号：US06618152B2

公开(公告)日：2003-09-09

申请号：US09849294

申请日：2001-05-07

申请人： Masahiro Toida

发明人： Masahiro Toida

IPC分类号： G01B902

CPC分类号： G01N21/4795 ,  A61B5/0066 ,  A61B5/0073 ,  G01B9/02003 ,  G01B9/02014 ,  G01B9/02091 ,  G02B6/02085 ,  G02B6/2861

摘要： In an optical coherence tomography apparatus: low-coherence light from a light source is split into signal light and reference light; at least one of the frequencies of the signal light and the reference light is shifted so as to produce a predetermined frequency difference between the frequencies; the reference light and a portion of the signal light reflected from the object are optically multiplexed so as to produce interference light; and the optical intensity of the interference light is detected in order to obtain a tomographic image of the object. In the light source, the pulse width of pulsed light emitted from a pulsed light source unit is reduced by an optical-waveguide structure. The optical-waveguide structure is made of a material having a normal dispersion characteristic, and includes a structure which realizes an anomalous dispersion characteristic so as to reduce the pulse width of the pulsed light.

摘要翻译： 在光学相干断层摄影装置中：来自光源的低相干光被分成信号光和参考光; 信号光和参考光的频率中的至少一个被移动，以产生频率之间的预定频率差; 将参考光和从物体反射的信号光的一部分光学多路复用以产生干涉光; 并且检测干涉光的光强度以获得物体的断层图像。 在光源中，通过光波导结构减少从脉冲光源单元发射的脉冲光的脉冲宽度。 光波导结构由具有正常色散特性的材料制成，并且包括实现异常色散特性以减小脉冲光的脉冲宽度的结构。

公开(公告)号：US06614533B1

公开(公告)日：2003-09-02

申请号：US09528245

申请日：2000-03-17

申请人： Yoshiaki Hata

发明人： Yoshiaki Hata

IPC分类号： G01B902

CPC分类号： G01J3/32 ,  G01J3/2823 ,  G01S7/4802 ,  G01S17/02

摘要： A spectroscopic image input system has an image data capturing apparatus for capturing the image data of an object by using a two-dimensional image-sensing device, a spectrum data obtaining apparatus for obtaining the spectrum data of the object within a smaller area and with higher wavelength resolution than the image data capturing apparatus, and a determination section for determining a portion of the object in which to obtain the spectrum data on the basis of the image data captured. Thus, this spectroscopic image input system captures the image data and obtains the spectrum data automatically.

摘要翻译： 分光图像输入系统具有图像数据拍摄装置，用于通过使用二维图像感测装置捕获对象的图像数据，频谱数据获取装置，用于在较小区域内获得对象的频谱数据，并且具有较高的 波长分辨率，以及确定部分，用于基于所捕获的图像数据来确定其中获得频谱数据的对象的一部分。 因此，该分光图像输入系统捕获图像数据并自动获取频谱数据。

公开(公告)号：US06611341B2

公开(公告)日：2003-08-26

申请号：US09811087

申请日：2001-03-17

申请人： Randy Dean May

发明人： Randy Dean May

IPC分类号： G01B902

CPC分类号： H01S5/0687 ,  H01S3/1303 ,  H01S5/0617 ,  H01S5/4087

摘要： The method and system operate to calibrate a transmission laser of the dense wavelength division multiplexer (DWDM) and to lock the laser to a selected transmission wavelength. In one example, the transmission laser is a widely tunable laser (WTL) to be tuned to one of a set of International Telecommunications Union (ITU) transmission grid lines for transmission through an optic fiber. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a set of transmission lines for detection by a detector. Another portion of the beam is routed directly to another detector. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line. The wavelength-locking controller thereafter monitors the temperature of the etalon and keeps the temperature constant to prevent any wavelength drift in the etalon. In one example, the etalon is a silicon etalon configured to have finesse of about 20 and to provide a free spectral range of about 8 GHz. With these parameters, the system is able to lock the wavelength of the WTL to within a precision of about 0.2 GHz. In another example, the etalon is first calibrated during manufacture to determine a “set point” operating temperature sufficient to align transmission peaks of the etalon with desired ITU grid lines. The etalon is thereafter mounted within a WTL and the etalon is adjusted to the set point temperature so as to align transmission peaks of the etalon with the desired ITU grid lines to permit wavelength locking. This later technique allows for rapid switching between channels and obviates the need for a gas cell within the WTL.

公开(公告)号：US06597458B2

公开(公告)日：2003-07-22

申请号：US09775945

申请日：2001-02-02

申请人： Tristan J. Tayag ,  Christopher A. Belk

发明人： Tristan J. Tayag ,  Christopher A. Belk

IPC分类号： G01B902

CPC分类号： G01B9/02084 ,  G01B9/02067

摘要： A method and system for stabilizing and demodulating an interferometer at quadrature are described. In response to receipt of a signal indicative of optical power of the interferometer, an interferometer control system determines an optical path length correction required to stabilize the interferometer at quadrature utilizing signal amplitudes appearing at multiple harmonics of the signal. In a particularly preferred embodiment, the signal amplitudes are calculated utilizing the Goertzel algorithm, a computationally efficient discrete Fourier transform. The interferometer control system then outputs an error signal indicative of the optical path length correction. In a preferred embodiment, the error signal forms the DC component of a composite stabilization signal, whose AC component is the reference modulation signal utilized to excite a transducer to modulate the optical path length of the interferometer. With the interferometer stabilized at quadrature, the interferometer control system determines a first signal amplitude of a particular harmonic without target oscillation and a second signal amplitude of the same harmonic with target oscillation. Based upon the relative magnitudes of the first and second signal amplitudes, the interferometer control system determines a solution set for the displacement amplitude of the interferometer target. Any ambiguity in the displacement amplitude can then be eliminated utilizing additional information gained from the signal amplitude present at a harmonic of a target oscillation frequency.

公开(公告)号：US06590666B2

公开(公告)日：2003-07-08

申请号：US09854070

申请日：2001-05-11

申请人： Douglas M. Baney ,  Bogdan Szafraniec

发明人： Douglas M. Baney ,  Bogdan Szafraniec

IPC分类号： G01B902

CPC分类号： G01J9/04 ,  G01J3/453

摘要： Heterodyne-based optical spectrum analysis involves measuring the sweep rate of a swept local oscillator signal and then generating an output signal that accounts for non-uniformities in the sweep rate of the swept local oscillator signal. In an embodiment, an input signal is combined with a swept local oscillator signal in an optical coupler and the sweep rate of the swept local oscillator signal is measured in a relative frequency measurement system. The combined optical signal is output from the optical coupler to a receiver and a heterodyne beat signal is generated. The heterodyne beat signal and measured local oscillator frequency sweep rate information are utilized by a signal processor to generate an output signal that is indicative of an optical parameter of the input signal and that accounts for non-uniformities in the sweep rate of the local oscillator signal. Because the actual sweep rate of the swept local oscillator signal is measured during analysis of the input signal, the horizontal scale accuracy of heterodyne-based OSAs is improved.

公开(公告)号：US06587213B1

公开(公告)日：2003-07-01

申请号：US09716115

申请日：2000-11-15

申请人： Bryon Knight ,  Julius Frankel ,  Moayyed Hussain ,  Jeffrey Braunstein

发明人： Bryon Knight ,  Julius Frankel ,  Moayyed Hussain ,  Jeffrey Braunstein

IPC分类号： G01B902

CPC分类号： G01H1/04 ,  G01N29/2418 ,  G01N29/348 ,  G01N29/46 ,  G01N2291/0231 ,  G01N2291/0234 ,  G01N2291/0251 ,  G01N2291/0423

摘要： The present invention is a nondestructive and quantitative laser ultrasonic laser apparatus and associated method for determining adhesion quality of a coating on a substrate. The apparatus of the invention is preferably a pulsed laser for generation and Michelson-type interferometer based system and includes a rotary probe head assembly for making evaluations within a cylindrical test specimen. The method of the invention includes data analysis that uses acquired data from the ultrasonic laser apparatus and computes the dispersion relation or curves (frequency versus velocity) using a ridge-following technique in wavelet analysis and from this, outputs the adhesive quality of the coating by comparing it with a theoretically based determination of a particular coating/substrate bond system. The invention is used for evaluating adhesion quality of coatings used in a gun bore.

摘要翻译： 本发明是一种非破坏性和定量的激光超声波激光装置及其相关方法，用于确定基材上涂层的粘附质量。 本发明的装置优选地是用于发电的脉冲激光器和基于迈克尔逊型干涉仪的系统，并且包括用于在圆柱形试样内进行评估的旋转探针头组件。 本发明的方法包括使用来自超声波激光装置的获取数据的数据分析，并且使用小波分析中的脊跟随技术来计算色散关系或曲线（频率对速度），并且由此输出涂层的粘合质量 将其与特定涂层/底物粘合体系的基于理论的测定相比较。 本发明用于评估在枪孔中使用的涂层的粘附质量。

公开(公告)号：US06587207B2

公开(公告)日：2003-07-01

申请号：US09913873

申请日：2001-10-13

申请人： Roland Hessert ,  Michael Zielinski ,  Gerhard Ziller

发明人： Roland Hessert ,  Michael Zielinski ,  Gerhard Ziller

IPC分类号： G01B902

CPC分类号： G01H9/00

摘要： In a method for generating time markers of arbitrary points on moving components and an optical trigger device for performing the method, light from a broadband light source with a correspondingly short coherence length is split into two paths, namely a measurement light path and a reference light path, and is coupled into two optical waveguides, the light of the reference light path is at least partially coupled back and the light of the measurement light path is focused at a measurement point and reflected by the component passing through the focus, wherein the light distances in the measurement light path up to the focus and in the reference light path up to the coupling-back plane are of the same length within the coherence length of the radiated light, wherein the coupled-back light from the reference light path and the measurement light path is brought to interference and detected by a detector, and wherein a short modulation event occurs at the detector when the component passes through the focus.

摘要翻译： 在用于产生移动部件上的任意点的时间标记的方法和用于执行该方法的光学触发装置的方法中，来自具有相应短的相干长度的宽带光源的光被分成两条路径，即测量光路和参考光 并且被耦合到两个光波导中，参考光路的光至少部分耦合回来，并且测量光路的光聚焦在测量点处并被穿过焦点的分量反射，其中光 在测量光路中直到聚焦和参考光路直到耦合背面的距离在辐射光的相干长度内具有相同的长度，其中来自参考光路的耦合反射光和 测量光路由检测器引起干扰并检测，并且其中当分量通过时，在检测器处发生短调制事件 通过焦点。

公开(公告)号：US06577403B1

公开(公告)日：2003-06-10

申请号：US09592963

申请日：2000-06-13

申请人： Jérôme Primot ,  Nicolas Guerineau

发明人： Jérôme Primot ,  Nicolas Guerineau

IPC分类号： G01B902

CPC分类号： G01J9/0215

摘要： In a process for analyzing the wavefront of a light beam, a diffraction grating with rectangular meshing is placed in a plane perpendicular to the light beam to be analyzed and optically conjugate with the analysis plane. Different emergent beams from the grating interfere to form an image whose deformations are related to the slopes of the wavefront analyzed. The grating multiplies an intensity function, implemented by a two-dimensional intensity grating, which defines a rectangular meshing of sub-pupils transmitting the light from the beam to be analyzed into a plurality of emergent beams disposed in accordance with a rectangular meshing, with a phase function implemented by a two-dimension phase grating which introduces a phase shift between two adjacent emergent beams such that the two emergent beams are in phase opposition.

摘要翻译： 在用于分析光束的波前的处理中，将具有矩形网格的衍射光栅放置在垂直于要分析的光束的平面中并且与分析平面光学共轭。 来自光栅的不同的出射光束干涉以形成其变形与所分析的波前的斜率相关的图像。 光栅乘以由二维强度光栅实现的强度函数，其限定将来自待分析光束的光传输到根据矩形网格设置的多个紧急光束的子瞳孔的矩形网格， 相位函数由二维相位光栅实现，其引入两个相邻出射光束之间的相移，使得两个出射光束相位相反。