公开(公告)号：US4320394A

公开(公告)日：1982-03-16

申请号：US98957

申请日：1979-11-30

申请人： Robert S. John, Jr.

发明人： Robert S. John, Jr.

IPC分类号： G01D5/26 ,  G01F23/60 ,  G08B21/00

CPC分类号： G01D5/268 ,  G01F23/60 ,  Y10S250/902

摘要： A fiber optics level sensor (FOLS) or flow sensor (FOFS) system for use in hazardous environments, process control, and industrial and environmental control applications. The system includes a pair of fiber optic bundles arranged between a remote sensor and a control module. The remote sensor detects the position of a movable vane--which is mechanically coupled to a float in the sensed environment--by means of a transmission gap between confronting ends of the pair of fiber optic bundles. The control module includes a light output device driven by an oscillator which thereby generates pulses of light which are optically coupled to the end of one of the bundles. The end of the other bundle is coupled to a photodetector which generates electrical pulses in response to the returning light pulses. The electrical pulses are amplified and then gated through a sampling circuit which is internally synchronized by means of and in resonse to the oscillator. The gated electrical pulses are then coupled to a staircase generator the output of which is coupled to a comparator. When the output of the staircase generator falls below a predetermined level the output of the comparator changes state to provide an indication that the vane has interrupted the light path in the gap. The output of the comparator controls a relay which is coupled to an external utilization device such as an alarm or a valve control.

摘要翻译： 用于危险环境，过程控制和工业和环境控制应用的光纤水平传感器（FOLS）或流量传感器（FOFS）系统。 该系统包括布置在远程传感器和控制模块之间的一对光纤束。 远程传感器通过在一对光纤束的相对端之间的传输间隙检测可移动叶片的位置，该可动叶片机械耦合到感测环境中的浮子。 控制模块包括由振荡器驱动的光输出装置，由此产生光耦合到一个束的端部的光脉冲。 另一个束的端部耦合到光电检测器，其响应于返回的光脉冲而产生电脉冲。 电脉冲被放大，然后通过采样电路进行门控，该采样电路通过振荡器的内部同步并响应于振荡器。 门控电脉冲然后被耦合到阶梯发生器，其输出端连接到比较器。 当阶梯发生器的输出降低到预定水平以下时，比较器的输出改变状态以提供叶片中断间隙中的光路的指示。 比较器的输出控制连接到外部利用装置的继电器，例如报警或阀门控制。

公开(公告)号：US4870292A

公开(公告)日：1989-09-26

申请号：US168481

申请日：1988-03-15

申请人： Martin D. Alpert ,  James W. Snow

发明人： Martin D. Alpert ,  James W. Snow

IPC分类号： G01F23/292

CPC分类号： G01F23/2927 ,  G01F23/2925 ,  Y10S250/902

摘要： A fibre optic sensor, particularly for ascertaining fluid levels, utilizes at least two optical fibres having at least a portion thereof embedded in a transparent substrate material of similar refractive index. One of the fibres is coupled to a light source, the other to a light detector. The fibres are oriented in a plane relative to the interface between substrate and fluid so that light exiting the source fibre is coupled to the detector fibre when total internal reflection at the interface occurs in the presence of a first fluid. In the presence of a second fluid of higher refractive index than the first fluid there will be no coupling. Several different embodiments, to achieve discrete or continuous level sensing or the sensing of other parameters are disclosed.

摘要翻译： 特别是用于确定流体水平的光纤传感器利用至少两根光纤，其中至少一部分光纤嵌入具有类似折射率的透明基底材料中。 光纤中的一个耦合到光源，另一个耦合到光检测器。 纤维相对于衬底和流体之间的界面在平面中定向，使得当存在第一流体时，在界面处的全内反射发生时，离开源光纤的光耦合到检测器光纤。 在存在比第一流体更高折射率的第二流体的情况下，将不存在耦合。 公开了实现离散或连续水平感测或其它参数的感测的若干不同实施例。

公开(公告)号：US4441817A

公开(公告)日：1984-04-10

申请号：US173370

申请日：1980-07-29

申请人： Timothy R. Pryor

发明人： Timothy R. Pryor

IPC分类号： G01B11/00 ,  G01B11/02 ,  G01D5/26 ,  G01B11/14

CPC分类号： G01B11/00 ,  G01B11/024 ,  G01D5/268 ,  Y10S250/902

摘要： Method and apparatus for determining physical characteristics of an object, such as its location, utilizing a non-coherent fiber optic bundle. In one embodiment, a non-coherent fiber optic bundle containing up to 30% randomly non-aligned fibers is utilized and an object is imaged onto one end of the bundle and the image is transferred from the other end of the bundle to a photodetector comprising a plurality of discrete photodetector elements. The area of the lighted or unlighted portion at the other end of the bundle is utilized to determine the physical characteristics of the object.

摘要翻译： 用于使用非相干光纤束来确定物体的物理特性的方法和装置，例如其位置。 在一个实施例中，使用了包含高达30％的随机非对准光纤的非相干光纤束，并且将物体成像到束的一端，并且将图像从束的另一端传送到光电检测器，其包括 多个离散光电检测元件。 束的另一端的点亮或未亮起部分的区域用于确定物体的物理特性。

公开(公告)号：US3384885A

公开(公告)日：1968-05-21

申请号：US52911866

申请日：1966-02-21

申请人： GEN MOTORS CORP

发明人： FORBUSH LOTHROP M

IPC分类号： G01F23/292

CPC分类号： G01F23/2927 ,  Y10S250/901 ,  Y10S250/902 ,  Y10S250/903

公开(公告)号：US06177874B1

公开(公告)日：2001-01-23

申请号：US09074057

申请日：1998-05-07

申请人： Ching-Chih Cheng ,  Wen-Liang Fang ,  Kuo-Feng Huang ,  Hung-Lung Ma

发明人： Ching-Chih Cheng ,  Wen-Liang Fang ,  Kuo-Feng Huang ,  Hung-Lung Ma

IPC分类号： G08B2100

CPC分类号： G01F23/2925 ,  Y10S250/902 ,  Y10S250/904

摘要： A liquid supplying device comprising a liquid container for storing a liquid so as to supply an external device and a liquid level sensor for detecting the liquid level. As the liquid within the liquid container is gradually used up, liquid level drops. As soon as the remaining liquid in the container drops to a predetermined amount, the liquid level sensor emits a warning signal to the operator, and the operator can then replenish the liquid in the container.

摘要翻译： 一种液体供应装置，包括用于存储液体以供应外部装置的液体容器和用于检测液面的液位传感器。 随着液体容器内的液体逐渐消耗，液面下降。 一旦容器中的剩余液体下降到预定量，液位传感器向操作者发出警告信号，然后操作者可以补充容器中的液体。

公开(公告)号：US5059812A

公开(公告)日：1991-10-22

申请号：US595129

申请日：1990-10-09

申请人： Bernhard Huber

发明人： Bernhard Huber

IPC分类号： G01F23/292 ,  G01N1/00 ,  G01N35/10

CPC分类号： G01N35/1009 ,  G01F23/292 ,  G01N2035/1025 ,  Y10S250/902

摘要： The control apparatus controls the lowering motion of an aspirator tube into a sample vessel in an automatic sample dispenser in a manner such that the smallest possible portion of an external surface of the aspirator tube is wetted by a liquid present in the sample vessel. A servo drive lowers the aspirator tube into the sample vessel. A sensor arrangement containing a single light guide, a light transmitter and a photoelectric receiver is associated with the aspirator tube and responds to light reflections at the liquid surface upon immersion of the lower aspirator tube end into the liquid. The light guide guides the propagating light beam and a returning reflected light beam. An electronic control controls the advancement of the aspirator tube via the servo drive into a position in which a predetermined short length in the region of the lower aspirator tube end dips into the liquid. When the liquid level drops due to aspiration of liquid into the aspirator tube, the lower end of the latter follows just this drop of the liquid level so that the aspirator tube continuously remains immersed into the liquid but only with the short length at its lower end.

摘要翻译： 控制装置控制吸气管在自动样品分配器中的样品容器中的下降运动，使得吸气管的外表面的最小可能部分被存在于样品容器中的液体润湿。 伺服驱动器将吸气管降低到样品容器中。 包含单个光导，光发射器和光电接收器的传感器装置与抽吸管相关联，并且在将下吸气管管端浸入液体中时对液面处的光反射作出响应。 光导引导传播的光束和返回的反射光束。 电子控制器通过伺服驱动器将抽吸管的前进控制到下抽吸管端部区域中预定的短长度浸入液体中的位置。 当由于液体进入吸气管而液面下降时，后者的下端跟随液面的下降，使得吸气管连续地保持浸入液体中，但仅在其下端具有较短的长度 。

公开(公告)号：US4039845A

公开(公告)日：1977-08-02

申请号：US707245

申请日：1976-07-21

申请人： Jurg Oberhansli ,  Erwin Stalder ,  Willy Bulgheroni ,  Josef Penasa

发明人： Jurg Oberhansli ,  Erwin Stalder ,  Willy Bulgheroni ,  Josef Penasa

IPC分类号： G01F23/292

CPC分类号： G01F23/2925 ,  G02B3/08 ,  Y10S250/902

摘要： An optical-electrical liquid probe for sensing the presence or absence of a liquid comprises a light emitter and a light receiver housed within a translucent hollow body. When there is no liquid adjacent a sensing part of the body, the light rays from the emitter pass to the receiver by refraction through the walls of the body. The presence of liquid adjacent the sensing part of the body causes the light rays to be refracted in such a manner that they no longer reach the receiver with the result that the state of the receiver changes.

公开(公告)号：US3777574A

公开(公告)日：1973-12-11

申请号：US3777574D

申请日：1971-01-04

申请人： UNIV CALIFORNIA

发明人： BROWN D ,  ISAACS J

IPC分类号： G01N9/18 ,  G01N9/10

CPC分类号： G01N9/18 ,  Y10S250/902

摘要： A specific gravity sensor that is disposed in a liquid, the sensor including at least one pair of vertically extending, light-transmitting elements, one of the elements of the pair having a light-emitting portion submerged in the liquid, which portion is spaced from a confronting light-receiving portion of the other element. Each element has a portion that extends above the liquid and one of those latter portions is subjected to light. A light-flow inhibitor is guided vertically to move upwardly and downwardly between those submerged portions of those elements depending upon the variations in the specific gravity of the liquid and the inhibitor thereby functions to permit and prevent, respectively, the transmission of light therebetween. The sensor can be employed in a system for controlling mechanism by picking up light rays that emanate from the light-receiving light-transmitting element.

摘要翻译： 一种布置在液体中的比重传感器，该传感器包括至少一对垂直延伸的透光元件，该对中的一个元件具有浸没在液体中的发光部分，该部分与液体间隔开 另一个元件的面对的光接收部分。 每个元件具有在液体上方延伸的部分，并且这些后部分中的一个被照射。 根据液体和抑制剂的比重的变化，光流阻止器被垂直地引导以在这些元件的这些浸没部分之间向上和向下移动，从而起到分别允许和防止它们之间的透光的作用。

公开(公告)号：US06668645B1

公开(公告)日：2003-12-30

申请号：US10174425

申请日：2002-06-18

申请人： Daniel A. Gilmour ,  John R. Forgue

发明人： Daniel A. Gilmour ,  John R. Forgue

IPC分类号： G01F2300

CPC分类号： G01F23/2927 ,  Y10S250/902

摘要： An optical fuel level sensor for providing an electronic signal representative of the fuel level within a fuel tank, generally comprising a waveguide body, a photo source, and a photo receiver. The waveguide body can either be of a dual-tapered or single-taper shape and includes numerous tiered facets, which are angled surfaces located on the outer periphery of the waveguide. When the fuel level within the fuel tank is above a particular tiered facet, light that impinges that facet will refract out of the waveguide, conversely, when the fuel level is below that facet, impinging light will be reflected back into the waveguide such that it is received by the photo receiver. In this manner, the fuel level sensor is able to utilize the reflected light received by the photo receiver to provide an electronic signal representative of the fuel level. Furthermore, a calibration feature may be included which provides calibration information indicating when the fuel level has reached a known, predetermined level.

摘要翻译： 一种光学燃料液位传感器，用于提供代表在燃料箱内的燃料水平的电子信号，所述燃料液位通常包括波导体，光源和照相接收器。 波导体可以是双锥形或单锥形形状，并且包括多个分层小面，其是位于波导的外周边上的成角度的表面。 当燃料箱内的燃料液位高于特定分层面时，撞击该面的光将从波导折射出去，相反地，当燃料水平低于该面时，入射光将被反射回波导，使得 被照片接收者接收。 以这种方式，燃料液位传感器能够利用由光接收器接收的反射光提供表示燃料液位的电子信号。 此外，可以包括校准特征，其提供指示燃料水平何时达到已知的预定水平的校准信息。

公开(公告)号：US20020194911A1

公开(公告)日：2002-12-26

申请号：US09888038

申请日：2001-06-22

发明人： Xavier Allegre ,  Danier Bouvier ,  Gilbert Spiesser

IPC分类号： G01F023/00

CPC分类号： G01F23/2927 ,  Y10S250/90 ,  Y10S250/902

摘要： This device includes the following: An array of optical detectors (9) attached to a mount (8), vertically spaced apart relative to one another and distributed within the tank (2) over the height of the latter, with each detector (9) including a light source and a receiver, and means (17) for feeding electric power to the light sources of the various detectors (9), for processing the signals arriving at the various receivers (12) and for transmitting these to a liquefied-gas fill-level display gauge (20). The mount and the detectors on it are encapsulated in a synthetic resin (13) that is highly transparent to the light beam emitted by the light sources (10) and the surface of the resin facing the detectors (9) is such that the beam emitted by the corresponding light source (10) is reflected toward the associated receiver (12).

摘要翻译： 该装置包括以下：附接到安装件（8）的光学检测器（9）的阵列，每个检测器（9）相对于彼此垂直间隔开并且在罐（2）的高度上分布在罐（2）内， 包括光源和接收器，以及用于向各种检测器（9）的光源馈送电力的装置（17），用于处理到达各种接收器（12）的信号并将其发送到液化气 填充液位显示仪（20）。 安装件和其上的检测器被封装在对由光源（10）发射的光束高度透明的合成树脂（13）中，并且面向检测器（9）的树脂的表面使得发射的光束 相应的光源（10）被反射向关联的接收器（12）。