公开(公告)号：US5164848A

公开(公告)日：1992-11-17

申请号：US603930

申请日：1990-10-26

申请人： Kenneth Firth ,  Roger M. Langdon

发明人： Kenneth Firth ,  Roger M. Langdon

IPC分类号： G02B6/00 ,  G02B5/30 ,  G02B5/32 ,  G02B27/00 ,  G02B27/01 ,  G02B27/28 ,  G02F1/01 ,  G09B9/30 ,  H01S1/00

CPC分类号： G09B9/307 ,  G02B27/017 ,  G02B27/0172 ,  G02B2027/0174 ,  G02B5/30

摘要： A holographic objective system (3) produces an intermediate real image (4) of information displayed on an electrically addressable spatial light modulator or SLM (1), the real image (4) being collimated by a powered holographic reflector (5) constructed as part of the visor of a helmet worn by the viewer (9). The SLM (1) is illuminated by laser light from a remote laser (8) via a single optical fibre (6) and beam splitter (2). A diffuser (7) is provided either between the laser and the beam splitter or in the plane of the intermediate image (4). The objective system (3) may alternatively include, or consist entirely of, conventional optical elements.

公开(公告)号：US5026162A

公开(公告)日：1991-06-25

申请号：US349229

申请日：1989-05-09

申请人： Roger M. Langdon

发明人： Roger M. Langdon

IPC分类号： G01B11/00 ,  G01S3/782

CPC分类号： G01B11/00 ,  G01S3/782

摘要： A position measurement system transmits moving interference pattern and these are received by a sensor fixed relative to the transmitter and a mobile sensor, by comparing the phases of the interference pattern at the two sensors the position of the mobile sensor relative to the transmitter can be calculated.

公开(公告)号：US4887033A

公开(公告)日：1989-12-12

申请号：US163577

申请日：1988-03-03

申请人： Roger M. Langdon ,  Cyril Smith

发明人： Roger M. Langdon ,  Cyril Smith

IPC分类号： G01R33/04

CPC分类号： G01R33/04

摘要： A fluxgate magnetometer includes a body of magnetic material, a drive coil and a sensing coil. At least one of the drive coil and the sensing coil is composed of two portions, each of the two portions being disposed in generally parallel planes which are spaced apart and respectively include an electrically insulating substrate and a spiral shaped portion which is electrically conductive supported by the electrically insulating substrate, the two portions being electrically connected such that electric current flows in the respective spiral shaped portions in opposite rotational senses relative to the body of magnetic material.

公开(公告)号：US5510890A

公开(公告)日：1996-04-23

申请号：US136918

申请日：1993-10-18

申请人： Roger M. Langdon ,  Edward L Lewis

发明人： Roger M. Langdon ,  Edward L Lewis

IPC分类号： G01S7/481 ,  G01S7/499 ,  G01S17/10 ,  G01C3/08

CPC分类号： G01S7/4818 ,  G01S17/10 ,  G01S7/487 ,  G01S7/499

摘要： In a laser radar system, in which pulses from a laser are focused by a telescope onto a target, the back-scattered radiation being deflected by polarizing beam splitter onto a detector in conjunction with a reference beam, the reference beam being produced from pulses derived from the pulse laser by the beam splitter, the pulses making repeated journeys around a cavity and a proportion of the pulse being emitted each time so that each input pulse produces a multiplicity of output pulses to form the reference beam, thereby avoiding the need for a separate laser for the reference beam.

摘要翻译： 在激光雷达系统中，其中来自激光的脉冲由望远镜聚焦到目标上，反向散射的辐射通过偏振分束器与参考光束一起被偏转到检测器上，参考光束由衍生的脉冲产生 通过分束器从脉冲激光器中，脉冲在腔周围重复行进，并且每次发射脉冲的一部分，使得每个输入脉冲产生多个输出脉冲以形成参考光束，从而避免需要 单独的激光用于参考光束。

公开(公告)号：US5059781A

公开(公告)日：1991-10-22

申请号：US585782

申请日：1990-09-20

申请人： Roger M. Langdon

发明人： Roger M. Langdon

IPC分类号： G01S5/16

CPC分类号： G01S5/163

摘要： The orientation of a helmet is monitored by illuminating the cockpit volume by a moving interference pattern produced by three beams. The sensors detect the varying phase to produce outputs which are compared to determine the orientation of the helmet.

摘要翻译： 通过由三个梁产生的移动干涉图来照亮驾驶舱体积来监测头盔的朝向。 传感器检测变化阶段以产生与确定头盔方向相比较的输出。

公开(公告)号：US4383443A

公开(公告)日：1983-05-17

申请号：US222759

申请日：1981-01-06

申请人： Roger M. Langdon

发明人： Roger M. Langdon

IPC分类号： G01F23/296 ,  G01F23/28

CPC分类号： G01F23/2966

摘要： A liquid-level measuring device including, in effect, two similar elongate members each adapted to be partially submerged in a liquid, the two elongate members being displaced lengthwise relative to one another by an odd number of quarter wavelengths of a predetermined wavelength of a chosen flexurally resonant mode of the elongate members. Each elongate member has flexure wave transmitting elements in contact therewith for launching flexure waves along the member and flexure wave receiving elements in contact with the member for receiving flexure waves launched by the transmitting elements. Also, associated with each elongate member is a phase detection arrangement connected both to the transmitting elements and to the receiving elements for detecting and comparing the phase of the flexure waves at the transmitting elements with the phase at the receiving elements so as to obtain a phase difference measurement, the magnitude of which provides an indication of the resonance frequency of the elongate member. An operating unit is connected to the respective outputs of the two phase detection arrangements so as to provide an indication of the extent to which the elongate members are immersed in the liquid.

摘要翻译： 液面测量装置实际上包括两个类似的细长构件，每个适于部分地浸没在液体中，两个细长构件相对于彼此纵向相对于所选择的预定波长的奇数个四分之一波长 细长构件的弯曲共振模式。 每个细长构件具有与其接触的挠曲波发射元件，用于沿构件发射挠曲波，以及与用于接收由发射元件发射的挠曲波的构件接触的挠曲波接收元件。 此外，与每个细长构件相关联的是相位检测装置，其连接到发射元件和接收元件，用于检测和比较发射元件处的挠曲波的相位与接收元件处的相位，以便获得相位 差值测量，其幅度提供细长构件的共振频率的指示。 操作单元连接到两相检测装置的相应输出端，以便提供细长构件浸入液体的程度的指示。

公开(公告)号：US4772786A

公开(公告)日：1988-09-20

申请号：US940319

申请日：1986-12-10

申请人： Roger M. Langdon

发明人： Roger M. Langdon

IPC分类号： G01L1/24 ,  G01D5/26 ,  G01H9/00 ,  G01K5/52 ,  G01L1/10 ,  G01L1/18 ,  G01L9/00 ,  G01L11/02 ,  G01P15/093 ,  G01D5/34

CPC分类号： G01L1/103 ,  G01D5/268 ,  G01H9/006 ,  G01K5/52 ,  G01L1/186 ,  G01L11/02 ,  G01L9/0014 ,  G01L9/0017 ,  G01L9/002 ,  G01L9/0079 ,  G01P15/093

摘要： A sensor comprises a beam, e.g. of silicon, which resonates at a frequency dependent on the force imposed on the beam. Light on a line induces resonance of the beam by means of the photothermal effect. The light reflected from the beam is amplitude modulated at the resonance frequency, and returns along the line. It is reflected by a semi-reflecting plane mirror onto a lens which focusses it onto a photodetector. The photodetector produces an output voltage modulated at the oscillation frequency, and is thus representative of the force imposed on beam 1.

摘要翻译： 一个传感器包括一个光束， 的硅，其以取决于施加在光束上的力的频率谐振。 线上的光线通过光热效应引起光束的共振。 从光束反射的光在谐振频率处进行幅度调制，并沿着线返回。 它被半反射平面镜反射到将其聚焦到光电检测器上的透镜上。 光电检测器产生以振荡频率调制的输出电压，因此代表施加在光束1上的力。

公开(公告)号：US4596153A

公开(公告)日：1986-06-24

申请号：US562750

申请日：1983-12-19

申请人： George A. Macdonald ,  Charles R. Jarvis ,  Roger M. Langdon

发明人： George A. Macdonald ,  Charles R. Jarvis ,  Roger M. Langdon

IPC分类号： G01F1/66 ,  G01F1/78 ,  G01F1/20

CPC分类号： G01F1/78 ,  G01F1/66 ,  G01F1/662

摘要： A flowmeter has a vane which is caused to vibrate at one of its resonant frequencies and a flexure standing wave set up along it. Two piezoelectric sensors are used to monitor characteristics of the standing wave and hence the mass flow rate of a fluid flowing past the vane along a pipe.The vane comprises a ceramic planar member on which a conductive ceramic ink is laid down to form tracks. The ink also bonds a ceramic piezoelectric transducer to the member to drive and maintain it in vibration. A non-conductive layer is laid down on the surface of the member covering the conductive tracks surrounding the transducer. A metal layer forms the external surface of the vane and acts as a ground plane for the transducer.

摘要翻译： 流量计具有叶片，其在其谐振频率中的一个振动并且沿其设置的挠曲驻波。 两个压电传感器用于监测驻波的特性，从而监测沿着管道流过叶片的流体的质量流量。 叶片包括陶瓷平面构件，导电陶瓷墨水放置在陶瓷平面构件上以形成轨道。 墨水还将陶瓷压电换能器粘合到构件上以驱动并保持其振动。 将非导电层放置在覆盖绕换能器的导电轨道的构件的表面上。 金属层形成叶片的外表面，并用作换能器的接地平面。

公开(公告)号：US4420983A

公开(公告)日：1983-12-20

申请号：US287293

申请日：1981-07-27

申请人： Roger M. Langdon

发明人： Roger M. Langdon

IPC分类号： G01F1/66 ,  G01F1/78 ,  G01F1/84

CPC分类号： G01F1/8431 ,  G01F1/66 ,  G01F1/8459

摘要： A device for measuring the mass flow of a fluid consists of a body which is arranged to resonate under the influence of a travelling flexure wave. Various embodiments of the invention are described. In certain embodiments in which the resonating body is in the form of a cylinder, the frequency of resonance is related to the mass of fluid flowing over the surface of the cylinder. In other embodiments, the wave velocity of the flexure wave is modified by a fluid flowing over the surface of the cylinder and amplitude modulation is introduced into the resonating flexure wave. The amplitude modulation is related to the mass of fluid flowing and an output indicative of the mass flow is produced. In further embodiments the body is in the form of a flat vane. The wave velocity of the flexure wave is modified by the fluid over the surface of the vane, and the wave velocity is monitored by comparing the relative phases of the flexure wave at different points along the vane. The phase difference is related to the mass of fluid flowing and an output indicative of the mass flow is produced.

摘要翻译： 用于测量流体质量流量的装置包括被布置成在行进的弯曲波的影响下共振的主体。 对本发明的各种实施方式进行说明。 在其中谐振体为气缸形式的某些实施例中，谐振频率与流过气缸表面的流体质量有关。 在其它实施例中，弯曲波的波速由流过气缸表面的流体改变，振幅调制被引入共振挠曲波。 幅度调制与流体流动的质量有关，产生表示质量流量的输出。 在另外的实施例中，主体是扁平叶片的形式。 弯曲波的波速由叶片表面上的流体改变，并且通过比较沿着叶片的不同点处的挠曲波的相对相位来监测波速。 相位差与流体流动的质量有关，产生表示质量流量的输出。

公开(公告)号：US4213337A

公开(公告)日：1980-07-22

申请号：US939987

申请日：1978-09-06

申请人： Roger M. Langdon

发明人： Roger M. Langdon

IPC分类号： G01F23/296 ,  G01F23/28 ,  G01S3/80

CPC分类号： G01F23/296 ,  G01F23/2962 ,  G01F23/2966

摘要： A liquid level sensing device consists of an elongate member in which flexure waves are induced. By partially submerging the elongate member in a fluid the depth of immersion can be determined from characteristics of the flexure waves. In one mode of operation the transit time for a flexure wave to travel along the elongate member is measured, and in another mode the nature of resonant modes in the flexure wave is determined.

摘要翻译： 液位传感装置由引导弯曲波的细长构件组成。 通过将细长构件部分地浸没在流体中，浸入深度可以根据挠曲波的特性来确定。 在一种操作模式中，测量挠曲波沿着细长构件行进的传播时间，并且在另一种模式中，确定弯曲波中的谐振模式的性质。