公开(公告)号：US4194194A

公开(公告)日：1980-03-18

申请号：US873200

申请日：1978-01-30

Applicant: John T. Redfern

Inventor： John T. Redfern

IPC: G01V1/20 ,  G08B13/16 ,  G08B13/00 ,  H01L41/10 ,  H04R17/00

CPC classification number: G01V1/201 ,  G08B13/169

Abstract: An intrusion sensor uses thin film piezoelectric transducers to sense nea mechanical vibrations. A hose-like sheath contains a pair of insulating strips which carry conductive leaves on their outer surfaces. A series of longitudinally arranged segments of a thin film piezoelectric material are coupled to the leaves to provide signals representative of impinging mechanical vibrations. Since adjacent ones of the thin film segments are alternately polarized, signals are created only when the vibrations are nearby. Greater sensitivity to nearby vibrations is assured when each of the segments is fabricated from several layers of the thin film piezoelectric material.

Abstract translation: 入侵传感器使用薄膜压电换能器感测附近的机械振动。 软管状护套包含一对在其外表面上承载导电叶片的绝缘条。 薄膜压电材料的一系列纵向排列的片段耦合到叶片以提供表示冲击机械振动的信号。 由于相邻的薄膜段是交替极化的，所以仅在振动附近产生信号。 当每个片段由多层薄膜压电材料制成时，确保对附近振动的更高的灵敏度。

公开(公告)号：US4330855A

公开(公告)日：1982-05-18

申请号：US126588

申请日：1980-03-03

Applicant: John T. Redfern ,  Gary A. Dressel

Inventor： John T. Redfern ,  Gary A. Dressel

IPC: G08C15/12 ,  H04J3/06

CPC classification number: G08C15/12

Abstract: The invention is an apparatus and method for multiplexing digital informan acquired from a multiplicity of data terminals distributed along a conductor of given length. A cyclic synchronization signal consisting of a stream of coding periods is transmitted upon the conductor. The duration of each coding period exceeds the two way travel time through the conductor. The leading edge of a coding period stimulates the transmission of one bit of a digital word stored in each terminal. The bits from the terminals arrive at a system receiver in a time sequence corresponding to the spatial distribution of the terminals. Bits are collected in storage registers according to their significance which is determined by the respective coding period during which they are received. A word from a particular terminal is derived by strobing the output of the storage registers at the time corresponding to the position of the terminal.

Abstract translation: 本发明是一种用于复用从沿着给定长度的导体分布的多个数据终端获取的数字信息的装置和方法。 由导体流传输由编码周期流组成的循环同步信号。 每个编码周期的持续时间超过导体的双向行进时间。 编码周期的前沿刺激存储在每个终端中的数字字的一位的传输。 来自终端的比特以对应于终端的空间分布的时间序列到达系统接收机。 根据存储寄存器的含义，由它们的接收到的编码周期决定位。 通过在对应于终端的位置的时间选通存储寄存器的输出来导出来自特定终端的字。

公开(公告)号：US4144530A

公开(公告)日：1979-03-13

申请号：US852265

申请日：1977-11-17

Applicant: John T. Redfern

Inventor： John T. Redfern

IPC: G02B6/44 ,  G08B13/16 ,  G08B13/22

CPC classification number: G08B13/22 ,  G02B6/4416 ,  G02B6/4469 ,  G08B13/1654

Abstract: A single composite cable is deployed between adjacent monitoring stations r sensing an intruder. A number of piezoelectric elements disposed in the cable provide electrical intrusion signals when they are disturbed. Power and triggering pulses for the stations are fed through the cable by a pair of electrical conductors and optical signals representative of the intrusion signals are fed through at least one optical fiber. As a result, the composite cable is relatively lightweight and compact to simplify deployment and it avoids the problems normally associated with crosstalk.

Abstract translation: 单个复合电缆部署在相邻的监控站之间，用于感测入侵者。 设置在电缆中的多个压电元件在被干扰时提供电侵入信号。 站的功率和触发脉冲通过一对电导体通过电缆馈送，代表入侵信号的光信号通过至少一根光纤馈送。 结果，复合电缆相对轻便且紧凑，以简化部署，并避免了与串扰通常相关的问题。

公开(公告)号：US4469399A

公开(公告)日：1984-09-04

申请号：US335903

申请日：1981-12-30

Applicant: Steven J. Cowen ,  James H. Daughtry ,  Christopher M. Young ,  John T. Redfern

Inventor： Steven J. Cowen ,  James H. Daughtry ,  Christopher M. Young ,  John T. Redfern

IPC: G02B6/44 ,  G02B7/26

CPC classification number: G02B6/4428

Abstract: A high pressure penetrator for use with fiber optic cables is fabricated by method which assures reliable operation. The method of fabrication first calls for providing a bore through the pressure wall of a container of instrumentation. Applying wax to one end of a cylindrically-shaped lens prepares it for alignment in the bore. A suitable lens is the one-half pitch graded refractive index lens of the type marketed under the trademark, SELFOC. The cylindrically-shaped lens is inserted into the bore to locate its far end flush with one side of the wall and so that the wax applied end of the lens lies within the bore at the wall's opposite side. Melting the wax allows it to flow around the tip of the wax applied end of the lens and a subsequent cooling of the melted wax precisely fixes the cylindrically-shaped lens into position within the bore. A high strength epoxy resin is potted in the clearance space between the lens and the bore by vacuum drawing the resin into the clearing space so that, upon curing the resin, the lens will be securely held in place to permit an optical aligning of fibers on either end of the lens to assure optical signal transfer.

Abstract translation: 用于光纤电缆的高压穿透器通过一种确保可靠运行的方法制造。 制造方法首先要求通过仪器容器的压力壁提供孔。 将蜡涂在圆柱形透镜的一端，准备在孔中对齐。 合适的镜头是以商标SELFOC销售的类型的半角度渐变折射率透镜。 将圆柱形透镜插入孔中以使其远端与壁的一侧齐平，使得透镜的蜡的端部位于壁的相对侧的孔内。 熔化蜡允许其在透镜的蜡的末端周围流动，随后冷却熔融的蜡精确地将圆柱形透镜固定在孔内的适当位置。 将高强度环氧树脂通过将树脂真空拉入到清空空间中，将透镜和孔之间的空隙中灌封，使得在固化树脂时，透镜将被牢固地保持在适当的位置，以允许光纤对准光纤 透镜的任一端以确保光信号传输。