Capacitive transducer system and method
    2.
    发明授权
    Capacitive transducer system and method 失效
    电容式传感器系统及方法

    公开(公告)号:US5161128A

    公开(公告)日:1992-11-03

    申请号:US621265

    申请日:1990-11-30

    Inventor: Martin J. Kenney

    CPC classification number: H04R19/00

    Abstract: A capacitive transducer including a back plate and a tensioned dielectric diaphragm with a conductive layer is operated as a sonic energy emitter and receiver. The polarity of the dc bias applied to the transducer is periodically reversed to prevent charging and polarization of the dielectric diaphragm due to the applied electrostatic field. The bias voltage polarity is controlled in timed sequence with the application of a fluctuating voltage to generate sonic energy with optimum efficiency. Electrical signals resulting from received sonic energy are selectively inverted and provided with compensation for differences resulting from differences in bias polarities.

    Abstract translation: 包括背板和具有导电层的张紧电介质隔膜的电容式换能器作为声能发射器和接收器工作。 施加到换能器的直流偏置的极性周期性地反转,以防止由于施加的静电场引起的电介质隔膜的充电和极化。 偏置电压极性按照时序顺序进行控制,应用波动电压以最佳效率产生声能。 由接收到的声能产生的电信号被选择性地反相并且提供对由偏置极性差异导致的差异的补偿。

    Reference wire compensation method and apparatus
    3.
    发明授权
    Reference wire compensation method and apparatus 失效
    参考线补偿方法和装置

    公开(公告)号:US5569835A

    公开(公告)日:1996-10-29

    申请号:US522760

    申请日:1995-09-01

    CPC classification number: G01B5/068 G01B5/0014 B21B2261/02 B21B2263/02

    Abstract: A scanning system for monitoring the thickness, profile or other data from a moving product which includes a frame for mounting scanning transducers. The product is carried on a conveyor or the like through the frame and the transducers are mounted for transverse scanning motion across the top and bottom surfaces of the product at right angles to its direction of travel. Reference wires are connected between the side members of the frame and maintained at a constant tension independent of ambient temperatures. Reference wires are located between the transducers and both the top and bottom surfaces of the product. The wires provide a constant reference to detect distortion of the frame due to thermal or other stress and to provide correction data which is used to compensate for frame irregularities.

    Abstract translation: 一种用于监测来自移动产品的厚度,轮廓或其他数据的扫描系统,其包括用于安装扫描换能器的框架。 产品通过框架承载在输送机等上,并且换能器安装成横向扫描运动,跨越产品的顶表面和底表面与其行进方向成直角。 参考线连接在框架的侧构件之间并且保持恒定的张力,而与环境温度无关。 参考线位于换能器与产品的顶面和底面之间。 这些导线提供了一个恒定的参考,以检测由于热或其他应力引起的框架失真,并提供用于补偿框架不规则性的校正数据。

    Signalling system with ambient condition reference monitoring
    4.
    发明授权
    Signalling system with ambient condition reference monitoring 失效
    具有环境条件参考监测的信号系统

    公开(公告)号:US5051723A

    公开(公告)日:1991-09-24

    申请号:US414701

    申请日:1989-09-29

    CPC classification number: G08B13/1436 G08B13/1672

    Abstract: A self-contained theft and vandalism deterrent system for equipment security includes sensors (12) for detecting conditions to which an alarm (24, 26, 28, 50) is responsive. The analog signals from the sensors (12) are serially delivered by a multiplexer circuit (16) when they are then directed to a network (20) for conversion to digital signals. The digital signals are delivered to a micro processor (22) where the signals are evaluated to determine if an alarm condition exists. The sensing means (12) include sound and vibration detectors for monitoring the ambient envelope. The micro processor (22) includes built in reprogramming and comparator circuits for varying the level at which a given condition will trigger an alarm response.

    Abstract translation: 用于设备安全的独立的盗窃和破坏威慑系统包括用于检测警报(24,26,28,50)响应的状况的传感器(12)。 当传感器(12)的模拟信号然后被引导到网络(20)以转换成数字信号时,来自传感器(12)的模拟信号被多路复用器电路(16)串行传送。 数字信号被传送到微处理器(22),其中评估信号以确定是否存在警报状况。 感测装置(12)包括用于监测环境信封的声音和振动检测器。 微处理器(22)包括内置重编程和比较器电路,用于改变给定条件将触发报警响应的电平。

    Method and apparatus for acoustic sensing
    5.
    发明授权
    Method and apparatus for acoustic sensing 失效
    声学检测方法和装置

    公开(公告)号:US06615663B2

    公开(公告)日:2003-09-09

    申请号:US09771342

    申请日:2001-01-26

    Abstract: An acoustic sensing system to measure an interior characteristic of an object, for example, density, the presence of defects, or bond integrity (of a laminated object). The system includes a first set of acoustic transducers acting as transmitters for transmitting acoustic wave energy at a single frequency, which acoustic wave energy interacts with the object in a sensing region to provide transmitted, scattered, and reflected wave energy. A transmitter mounting mechanism allows the transmitters to be positioned in such a way that acoustic energy reflected from the object sets up a reverberation between the transmitter and the object. A second set of acoustic transducers acting as receivers of acoustic wave energy is positioned opposite the transmitters in such a way that acoustic waves passing through the object are coupled to the receivers. A second mounting mechanism allows the receivers to be similarly positioned such that acoustic energy passing through the object sets up a reverberation between the receiver and the object. A processor is connected to generate electrical control signals to the transmitter and to receive electrical signals from the receiver. The processor is operable to adjust the frequency of the electrical control signals to the transmitter in order to maintain a maximum of reverberation, and therefore a maximum of received signal at the receiver.

    Abstract translation: 用于测量物体的内部特性的声学感测系统,例如,密度,缺陷的存在或层叠物体的粘合完整性。 该系统包括作为发射器的第一组声换能器,用于以单个频率传输声波能量,该声波能量与感测区域中的物体相互作用以提供透射,散射和反射的波能量。 发射机安装机构允许发射机以这样的方式定位,使得从对象反射的声能量在发射器和物体之间建立起混响。 用作声波能量的接收器的第二组声换能器以这样的方式与发射器相对放置,使得穿过物体的声波耦合到接收器。 第二安装机构允许接收器被类似地定位,使得通过对象的声能设置在接收器和对象之间的混响。 连接处理器以产生到发射机的电控信号并从接收机接收电信号。 处理器可操作以将电控制信号的频率调整到发射机,以便保持最大的混响,并因此保持接收机处的接收信号的最大值。

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