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。

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：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：US06285288B1

公开(公告)日：2001-09-04

申请号：US09271711

申请日：1999-03-18

申请人： Roger M Langdon ,  Philip M Watts

发明人： Roger M Langdon ,  Philip M Watts

IPC分类号： G08B2100

CPC分类号： B64D43/00 ,  G01P5/26 ,  G01P13/02 ,  G01S17/58 ,  G01S17/933

摘要： A transmitter (41) is arranged to produce and focus a beam (54) on a remote focal point (55). A small proportion of resultant light (58) is back-scattered from the focal point (55) by particles or aerosols in air flowing through point (55) and returns to a receiver (42) where it is collected A detector combines resultant light (58) and reference light (72), splits the resultant light (58) and reference light (72) equally between two arms and detects which arm leads the other in phase thereby indicating the flow direction of air through focal point (55).

摘要翻译： 发射器（41）布置成产生并聚焦在远程焦点（55）上的光束（54）。 所产生的光（58）的一小部分由空气中的颗粒或气溶胶从焦点（55）反向散射，流过点（55），并返回到收集器（42）的接收器（42）。检测器结合光（ 58）和参考光（72），使得所得到的光（58）和参考光（72）在两个臂之间平均分开，并检测哪个臂相对引导另一个臂，从而指示空气通过焦点（55）的流动方向。

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：US5353109A

公开(公告)日：1994-10-04

申请号：US37433

申请日：1993-03-26

申请人： Roger M. Langdon ,  William R. McKnight

发明人： Roger M. Langdon ,  William R. McKnight

IPC分类号： G01S7/48 ,  G01S7/491 ,  G01S17/89 ,  G01P3/36 ,  G01B9/02

CPC分类号： G01S17/89 ,  G01S7/4802 ,  G01S7/4917

摘要： A receiver-transmitter for a target identification system having a particular but not necessarily an exclusive application for the identification of aircraft which utilizes laser vibrometry and a coherent array receiver including an array of photodetectors adapted to receive signals from different parts of the target and to use a corresponding array of frequency-offset reference beams to provide coherent detection of each of the received signals.

摘要翻译： 用于目标识别系统的接收器 - 发射器具有特定但不一定是用于识别使用激光振动测量的飞机的专用应用，以及包括适合于接收来自目标的不同部分的信号并使用的相干阵列接收器 相应的频偏参考波束阵列，以提供每个接收信号的相干检测。

公开(公告)号：US5323638A

公开(公告)日：1994-06-28

申请号：US866050

申请日：1992-04-10

申请人： Roger M. Langdon

发明人： Roger M. Langdon

IPC分类号： G01N9/00 ,  G01N11/16 ,  G01N29/024 ,  G01N29/22 ,  G01N29/34 ,  G01N33/03 ,  G01N9/34

CPC分类号： G01N11/16 ,  G01N29/024 ,  G01N29/222 ,  G01N29/348 ,  G01N33/03 ,  G01N9/002 ,  G01N2009/004 ,  G01N2291/012 ,  G01N2291/022 ,  G01N2291/02818 ,  G01N2291/0422

摘要： A sensor, for use in determining physical properties of fluid, comprises a flexible diaphragm having a plane. Two tines depend from the diaphragm substantially at right angles to the plane. First and second substantially planar transducers are each bonded to the diaphragm so that the plane of the transducers are parallel to that of the diaphragm. A first one of the transducers is operative, in use, to flex between in its plane and to couple an alternating driving force into the plane of the diaphragm such that the tines vibrate in an oscillatory motion. Second of the transducers is operative to detect vibrations of the diaphragm.

摘要翻译： 用于确定流体物理性质的传感器包括具有平面的柔性隔膜。 两个尖齿取决于隔膜基本上与平面成直角。 第一和第二基本上平面的换能器各自结合到隔膜，使得换能器的平面平行于隔膜的平面。 换能器中的第一个在使用中可操作地在其平面中弯曲并且将交替的驱动力耦合到隔膜的平面中，使得尖齿以振荡运动振动。 传感器中的第二个用于检测隔膜的振动。