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    • 75. 发明申请
    • NARROW FIELD ELECTROMAGNETIC SENSOR SYSTEM AND METHOD
    • 窄场电磁传感器系统及方法
    • WO1996030771A2
    • 1996-10-03
    • PCT/US1996003583
    • 1996-03-15
    • THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    • THE REGENTS OF THE UNIVERSITY OF CALIFORNIAMcEWAN, Thomas, E.
    • G01R00/00
    • G01F23/284G01S1/045G01S5/14G01S7/285G01S11/02G01S13/003G01S13/0209G01S13/0218G01S13/04G01S13/103G01S13/106G01S13/18G01S13/885G01S2013/9314G01S2013/9321G01V3/12G08B13/2497G08G1/04H04B1/7163
    • A narrow field electromagnetic sensor system and method of sensing a characterisitc of an object provide the capability to realize a characteristic of an object such as density, thickness, or presence, for any desired coordinate position on the object. One application is imaging. The sensor can also be used as an obstruction detector or an electronic trip wire with a narrow field without the disadvantages of impaired performance when exposed to dirt, snow, rain, or sunlight. The sensor employs a transmitter for transmitting a sequence of electromagnetic signals in response to a transmit timing signal, a receiver for sampling only the initial direct RF path of the electromagnetic signal while excluding all other electromagnetic signals in response to a receive timing signal, and a signal processor for processing the sampled direct RF path electromagnetic signal and providing an indication of the characteristic of an object. Usually, the electromagnetic signal is a short RF burst and the obstruction must provide a substantially complete eclipse of the direct RF path. By employing time-of-flight techniques, a timing circuit controls the receiver to sample only the initial direct RF path of the electromagnetic signal while not sampling indirect path electromagnetic signals. The sensor system also incorporates circuitry for ultra-wideband spread spectrum operation that reduces interference to and from other RF services while allowing co-location of multiple electronic sensors without the need for frequency assignments.
    • 用于感测物体特征的窄场电磁传感器系统和方法提供了对物体的任何所需坐标位置实现诸如密度,厚度或存在的物体的特性的能力。 一个应用是成像。 传感器也可以用作狭窄的障碍物检测器或电子跳闸线,而不会受到暴露于污物,雪,雨或阳光下的性能受损的缺点。 该传感器采用发送器,用于响应于发送定时信号发送一系列电磁信号;接收器,用于仅对电磁信号的初始直接RF路径进行采样,同时响应于接收定时信号排除所有其它电磁信号;以及 信号处理器,用于处理采样的直接RF路径电磁信号并提供对象特征的指示。 通常,电磁信号是短的RF突发,并且障碍物必须提供直接RF路径的基本上完全的日食。 通过采用飞行时间技术,定时电路控制接收机仅对电磁信号的初始直接RF路径进行采样,而不对间接路径电磁信号进行采样。 传感器系统还集成了用于超宽带扩频操作的电路,可减少与其他RF服务的干扰,同时允许多个电子传感器的共同定位,而无需频率分配。