公开(公告)号：US06778279B2

公开(公告)日：2004-08-17

申请号：US10078741

申请日：2002-02-19

Applicant: Charles Lange ,  Steve Sanders ,  Dick Ang ,  Lee K. Strandjord

Inventor： Charles Lange ,  Steve Sanders ,  Dick Ang ,  Lee K. Strandjord

IPC: G01B902

CPC classification number: G01C19/64 ,  G01B11/16 ,  G01C19/72 ,  G01D5/268 ,  G01N21/431 ,  G01S7/4811 ,  G01S7/4818 ,  G01S17/36 ,  G01S17/88

Abstract: A method is provided for sensing an environmental effect upon a sensing element and includes exposing the sensing element into the environmental effect, producing a light signal in the sensing element, modulating the light signal with a modulation signal, and determining a path length of the light signal as a function of the modulation signal. A fiber optic sensor is provided that includes a light source producing a light, a sensing element optically coupled to the light source such that the light propagates through the sensing element, a detector optically coupled to the sensing element. The detector detects light intensity propagating in the sensing element. An electronics processor receives the detector output and produces a modulation signal for the light. The processor further produces an output signal indicative of the environmental effect as a function of the modulation signal.

Abstract translation: 提供了一种用于感测对感测元件的环境影响的方法，并且包括将感测元件暴露于环境效应中，在感测元件中产生光信号，用调制信号调制光信号，以及确定光的路径长度 信号作为调制信号的函数。 提供了一种光纤传感器，其包括产生光的光源，光学耦合到光源的感测元件，使得光通过感测元件传播，光学耦合到感测元件的检测器。 检测器检测在感测元件中传播的光强度。 电子处理器接收检测器输出并产生光的调制信号。 处理器进一步产生指示作为调制信号的函数的环境影响的输出信号。

公开(公告)号：US6144788A

公开(公告)日：2000-11-07

申请号：US107677

申请日：1998-06-30

Applicant: Dick Ang ,  Timothy L. Spicer

Inventor： Dick Ang ,  Timothy L. Spicer

IPC: G01C19/72 ,  H01S3/06 ,  H01S3/067 ,  H01S3/137 ,  G02B6/26 ,  G01B9/02 ,  H01S3/30 ,  H04J14/00

CPC classification number: G01C19/721 ,  H01S3/067

Abstract: A fiber light source having, for instance, a 980 nm pump laser for pumping an erbium-doped optical fiber via a 980/1550 nm WDM coupler. The pumped fiber emits 1550 nm light. A portion of the 1550 nm light goes to a filter via the WDM coupler. The filter shapes the spectrum of the 1550 nm light. The filter is a passive device that may be made from erbium-doped fiber. From the filter the 1550 nm light goes through an isolator or a circulator on to an optical device for which the light is specially made. Such device may be an fiber optic gyroscope. By adding a narrowband optical fiber grating at the output of the pump laser to tune its output, the fiber light source is further improved in stability under variations of ambient temperature and light source drive current.

Abstract translation: 具有例如980nm泵浦激光器的光纤光源，用于经由980/1550nm WDM耦合器泵浦掺铒光纤。 泵浦光纤发出1550nm光。 1550nm光的一部分经由WDM耦合器进入滤光器。 滤光片形成了1550nm光的光谱。 滤波器是可以由掺铒光纤制成的无源器件。 从滤光器中，1550nm光通过隔离器或环行器到特别制造光的光学装置。 这种装置可以是光纤陀螺仪。 通过在泵激光器的输出处添加窄带光纤光栅来调节其输出，光纤光源在环境温度和光源驱动电流的变化下的稳定性进一步提高。

公开(公告)号：US06892005B2

公开(公告)日：2005-05-10

申请号：US09993528

申请日：2001-11-14

Applicant: Dick Ang

Inventor： Dick Ang

IPC: G02B6/12 ,  G02B6/122 ,  G02F1/313 ,  G02B6/26

CPC classification number: G02B6/122 ,  G02B2006/1204 ,  G02B2006/12045 ,  G02B2006/121 ,  G02B2006/12145 ,  G02F1/3132

Abstract: An integrated optical switch that has a low throughput loss during the “on” pulse, and a high throughput loss during the “off” period. The optical switch includes a substrate with at least two waveguide structures suitably formed on the substrate. One of the waveguide structures is substantially straight and connects an input port to an output port. During an “on” pulse, light may be guided along the substantially straight waveguide from the input port to the output port such that there is little throughput loss. During an “off” period, a voltage is applied across control electrodes such that the waveguides are coupled so that light does not reach the output port.

Abstract translation: 在“开”脉冲期间具有低吞吐量损失的集成光开关，以及在“关”期间的高吞吐量损失。 光学开关包括具有适当地形成在衬底上的至少两个波导结构的衬底。 一个波导结构基本上是直的，并将输入端口连接到输出端口。 在“开”脉冲期间，可以沿着基本上直的波导从输入端口向输出端口引导光，使得产生的损失小。 在“关闭”期间，跨越控制电极施加电压，使得波导耦合，使得光不到达输出端口。

公开(公告)号：US5289258A

公开(公告)日：1994-02-22

申请号：US821030

申请日：1992-01-15

Applicant: Bogdan Szafraniec ,  Richard H. Frische ,  Richard J. August ,  Kevin B. Dimond ,  Dick Ang ,  James N. Blake ,  John R. Feth

Inventor： Bogdan Szafraniec ,  Richard H. Frische ,  Richard J. August ,  Kevin B. Dimond ,  Dick Ang ,  James N. Blake ,  John R. Feth

IPC: G01C19/72 ,  G02F1/01

CPC classification number: G01C19/72

Abstract: An error control arrangement for an optical fiber rotation sensor having electromagnetic waves propagating in opposite directions passing through a bias optical phase modulator operated by a phase modulation generator both of which can contribute second harmonic distortion resulting in errors in the sensor output signal which are controlled. Control of the bias optical phase modulator contribution for a modulator having a piezoelectric body wrapped with an optical fiber portion is accomplished by mounting the body utilizing layers having nonlinear stiffness.

Abstract translation: 一种光纤旋转传感器的误差控制装置，其具有通过相位调制发生器操作的偏置光相位调制器的相反方向传播的电磁波，这两者都可以产生二次谐波失真，从而导致传感器输出信号中被控制的误差。 对具有用光纤部分包裹的压电体的调制器的偏置光学相位调制器贡献的控制通过使用具有非线性刚度的层来安装本体来实现。

公开(公告)号：US06798523B2

公开(公告)日：2004-09-28

申请号：US10004651

申请日：2001-12-04

Applicant: Charles Lange ,  Scott Anson ,  Dick Ang

Inventor： Charles Lange ,  Scott Anson ,  Dick Ang

IPC: G01B902

CPC classification number: G01M11/333 ,  G01D5/35325 ,  G01K11/32 ,  G01M11/331

Abstract: A fiber optic fault detector and generic fiber optic sensor system for detecting breaks in an optical fiber using a low coherence interferometric technique. The system comprises a light source configured to produce light traveling along the optical path, a modulator optically coupled to the light source configured to modulate at least a portion of the light as a function of a modulation signal, a detector optically coupled to the modulator configured to produce a detector output based upon a sensed intensity of the light, and an electronic array configured to receive the detector output and determine the optical fault. The low coherence interferometric technique allows for detection of a fault in the fiber with a minimal amount of test equipment and with higher measurement sensitivity and resolution. The system may alternatively include a transducer, positioned in place of the fiber under test, having a response which changes in reflective or optical path length. The system can be used in a LIDAR system, wherein telescope optics are used in place of the fiber under test, to transmit light and collect light scattered from objects or from the air.

Abstract translation: 一种用于使用低相干干涉技术检测光纤中断的光纤故障检测器和通用光纤传感器系统。 该系统包括被配置为产生沿着光路行进的光的光源，光学耦合到光源的调制器，被配置成根据调制信号调制至少一部分光;光耦合到调制器的检测器 以产生基于感测到的光强度的检测器输出;以及电子阵列，被配置为接收检测器输出并确定光学故障。 低相干干涉技术允许用最小量的测试设备和更高的测量灵敏度和分辨率来检测光纤中的故障。 替代地，该系统可以包括位于被测光纤上的换能器，具有反射或光路长度变化的响应。 该系统可以用在LIDAR系统中，其中使用望远镜光学器件来代替被测光纤，以透射光并收集从物体或从空气散射的光。

公开(公告)号：US06744966B2

公开(公告)日：2004-06-01

申请号：US09993995

申请日：2001-11-14

Applicant: Dick Ang ,  Timothy L. Spicer ,  Ren-Young Liu

Inventor： Dick Ang ,  Timothy L. Spicer ,  Ren-Young Liu

IPC: G02B600

CPC classification number: G01C19/721 ,  H01S3/067

Abstract: An example of a fiber optic light source has a pump laser that feeds light to a length of doped optical fiber. The optical fiber produces light that has a mean wavelength, for example in the range of 1515 nm to 1544 nm, such that the light is substantially unaffected when exposed to weapons level radiation.

Abstract translation: 光纤光源的示例具有将光馈送到一定长度的掺杂光纤的泵浦激光器。 光纤产生具有平均波长的光，例如在1515nm至1544nm的范围内，使得当暴露于武器级辐射时光基本上不受影响。

公开(公告)号：US06204921B1

公开(公告)日：2001-03-20

申请号：US09223235

申请日：1998-12-30

Applicant: Lee K. Strandjord ,  Gary W. Adams ,  Dick Ang

Inventor： Lee K. Strandjord ,  Gary W. Adams ,  Dick Ang

IPC: G01C1964

CPC classification number: G01C19/721

Abstract: A system is disclosed which suppresses relative intensity noise in a fiber optic gyroscope. A high-speed intensity modulator is placed in the gyroscope light path between the fiber light source and a tap coupler which provides a sample of the modulated signal for use in a feedback loop. A photodetector receives the sampled signal and provides current-to-voltage conversion of the signal. A high-bandwidth voltage amplifier then adjusts the gain and phase of the converted signal and drives the intensity modulator in such a manner as to stabilize the control loop and provide suppression of relative intensity noise. The present system modulates the intensity of the light at a frequency which is sufficiently high to allow suppression of high frequency components of the relative intensity noise.

Abstract translation: 公开了抑制光纤陀螺仪中的相对强度噪声的系统。 将高速强度调制器放置在光纤光源和抽头耦合器之间的陀螺仪光路中，该抽头耦合器提供用于反馈回路中的调制信号的采样。 光电检测器接收采样信号并提供信号的电流 - 电压转换。 然后，高带宽电压放大器调整转换信号的增益和相位，并以稳定控制回路并提供相对强度噪声的抑制的方式驱动强度调制器。 本系统以足够高的频率调制光的强度，以便抑制相对强度噪声的高频分量。

公开(公告)号：US5493623A

公开(公告)日：1996-02-20

申请号：US267093

申请日：1994-06-28

Applicant: Richard H. Frische ,  Dick Ang

Inventor： Richard H. Frische ,  Dick Ang

IPC: G01C19/72 ,  G02F1/01 ,  G02B6/10 ,  B29D11/00 ,  G01B9/02

CPC classification number: G01C19/721 ,  G02F1/0134

Abstract: A piezoelectric fiber optic phase modulator having a mount at a nodal point of the vibratory system of the modulator. The modulator is excited with an electric field applied in a direction parallel to the axis of the modulator or perpendicular to the radial direction of movement of the modulator. In contrast to the mere hollow cylinder modulator of the related art, the modulator of this invention has a web or center structure integral with the inside surface of the cylinder. The modulator here has a rugged mount, low absorption vibration and negligible harmonics at the mount for efficient and high Q functioning, and has rugged electrical connections for dependable operation.

Abstract translation: 一种压电光纤相位调制器，其具有在调制器的振动系统的节点处的安装座。 调制器由与调制器轴平行的方向或垂直于调制器的径向运动方向的电场激发。 与现有技术的纯空心圆筒调制器不同，本发明的调制器具有与气缸的内表面成一体的腹板或中心结构。 这里的调制器具有坚固的安装，低吸收振动和安装座上可忽略的谐波，实现高效和高Q功能，并具有坚固的电气连接，可靠运行。