公开(公告)号：US5406200A

公开(公告)日：1995-04-11

申请号：US19443

申请日：1993-02-18

Applicant: John D. Begin ,  Richard D. Koski

Inventor： John D. Begin ,  Richard D. Koski

IPC: G01B7/00 ,  G01F23/296 ,  G01B7/14 ,  G01F23/30 ,  G01R35/00

CPC classification number: G01B7/003 ,  G01F23/2963

Abstract: In a position detection probe having a magnetostrictive wire stretched between a head and a reflective foot end termination, and a magnet displaceable along the probe and using the sonic pulse propagation time from the magnet to the foot end termination as a position detection parameter, compensation for thermal expansion and thermal change of propagation velocity is made by measuring the wire resistance and calculating a compensation from the resistance. The probe is excited by an electrical pulse having a known current. The voltage across the wire is measured at a time when the current has stabilized to a precise value, and resistance is determined from the current and voltage.

Abstract translation: 在具有在头部和反射底端终端之间拉伸的磁致伸缩线的位置检测探头和沿着探头可移位的磁体并且使用从磁体到脚端终端的声波脉冲传播时间作为位置检测参数， 传播速度的热膨胀和热变化通过测量导线电阻并从电阻计算补偿来进行。 探针被具有已知电流的电脉冲激发。 在电流稳定在一个精确值的时候测量导线上的电压，并根据电流和电压确定电阻。

公开(公告)号：US5245178A

公开(公告)日：1993-09-14

申请号：US933111

申请日：1992-08-21

Applicant: Leonard W. Elias

Inventor： Leonard W. Elias

IPC: G01V8/20 ,  G01V13/00

CPC classification number: G01V8/20 ,  G01V13/00

Abstract: An apparatus and method for automatically testing a safety light curtain used to protect to an unsafe moving part of an industrial machine. A combined beam splitter and photodetector is temporarily attached to the receiver of the light curtain with beam splitter in the path of one of the light beams. A portion of the light beam continues to a receiver of the light curtain and a diverted portion of the light beam illuminates a photodetector. Interruption of this particular light beam simultaneously triggers a safety system to initiate the stopping of the machine and triggers the photodetector. A motion detector temporarily coupled to a rotating part of the machine determines when the machine has stopped. This motion detector may include a d.c. tachometer coupled via a resilient friction wheel. A timer connected to the photodetector and the motion detector determines the duration of the interval between interruption of the one light beam and the stopping of the machine. Either this time or a computed safety distance based upon a predetermined hand speed is displayed. This measured time or the computed distance can be used to determine if the light curtain is positioned far enough from any dangerous moving parts of the machine so that an emergency stoppage of the machine protects the operator from harm.

Abstract translation: 一种用于自动测试用于保护工业机器不安全移动部件的安全光幕的装置和方法。 组合的光束分离器和光电检测器在一个光束的路径中通过分束器临时地附接到光幕的接收器。 光束的一部分继续到光幕的接收器，并且光束的转向部分照射光电检测器。 该特定光束的中断同时触发安全系统以启动机器的停止并触发光电检测器。 临时耦合到机器的旋转部分的运动检测器确定机器何时停止。 该运动检测器可以包括直流 转速计通过弹性摩擦轮连接。 连接到光电检测器和运动检测器的定时器确定一个光束中断和机器停止之间的间隔的持续时间。 此时显示基于预定手速度的计算安全距离。 该测量时间或计算的距离可用于确定光幕是否远离机器的任何危险移动部件足够远，以便机器的紧急停机保护操作者免受伤害。

公开(公告)号：US4943773A

公开(公告)日：1990-07-24

申请号：US332771

申请日：1989-04-03

Applicant: Richard D. Koski ,  William C. Kosco ,  Arthur Dumais

Inventor： Richard D. Koski ,  William C. Kosco ,  Arthur Dumais

IPC: G01B7/00 ,  G01F23/296 ,  G01F23/68 ,  G01F23/72

CPC classification number: G01F23/68 ,  G01B7/003 ,  G01F23/2963 ,  G01F23/72

Abstract: A liquid level detector of the type in which a magnetostrictive wire extends through the liquid level measurement range and is captured in a tensioned vertical orientation within a stainless steel tube. Liquid level is measured as a function of the time required for a torsional disturbance imparted the wire near the top to travel along the wire to a magnet which is contained within a liquid level float which slides up and down along the tube. The torsional disturbances imparted to the wire by means of a piezoelectric crystal to which the wire is easily clamped. Accuracy is enhanced by measuring liquid level as a function of the elapsed time between an actuation signal and the first zero crossing of the voltage which is induced as the torsional strain passes through the area of influence of the sliding magnet.

Abstract translation: 一种液位检测器，其中磁致伸缩丝线延伸穿过液位测量范围，并以不锈钢管内的张紧垂直取向捕获。 液位测量是根据施加在顶部附近的钢丝沿着钢丝行进的扭转扰动所需的时间的函数来测量的，该磁体被包含在沿着管上下滑动的液位浮子内。 通过压电晶体赋予电线的扭转干扰，电线易于夹紧。 通过测量作为在扭转应变通过滑动磁体的影响区域而引起的电压的致动信号和第一过零点之间经过的时间的函数的液位，来提高精度。

公开(公告)号：US5196791A

公开(公告)日：1993-03-23

申请号：US766517

申请日：1991-09-27

Applicant: Arthur Dumais

Inventor： Arthur Dumais

IPC: G01B7/00 ,  G01D5/247

CPC classification number: G01B7/003 ,  G01D5/247

Abstract: A magnetostrictive linear displacement detector includes a dual pole magnet assembly. The displacement detector includes a magnetostrictive wire, a return wire and a magnet disposed for displacement along the magnetostrictive wire. A torsional strain sensor at the head end generates an electrical indication of the torsional strain within the magnetostrictive wire induced by passage of an electrical excitation by the position of the magnet. The magnet of this invention is a cylindrical magnetic bipole. The magnet includes two toroidal magnet sections. The first toroidal magnet section has radially disposed magnetic poles with the South pole directed inwardly and the North pole directed outwardly. The second toroidal magnet is a similar radial magnet except that it has its North pole directly inwardly and its South pole directly outwardly. The magnet assembly has a length preferably no more than one half inch. This length should be short in relation to the total length of the measurement range. This dual pole magnet assembly may also be used in a reciprocal system by producing a torsional strain at the head end and detecting an electrical response when the torsional strain passes the dual pole magnet assembly.

Abstract translation: 磁致伸缩线性位移检测器包括双极磁体组件。 位移检测器包括磁致伸缩线，返回线和设置用于沿着磁致伸缩线移位的磁体。 头端的扭转应变传感器产生由磁激励通过磁体的位置而引起的磁致伸缩线内的扭转应变的电指示。 本发明的磁体是圆柱形磁双极。 磁体包括两个环形磁体部分。 第一环形磁体部分具有径向设置的磁极，南极向内指向并且北极向外指向。 第二个环形磁铁是一个类似的径向磁体，除了它的北极直接向内，其南极直接向外。 磁体组件的长度优选不超过一半英寸。 该长度应相对于测量范围的总长度较短。 该双极磁体组件也可以在往复系统中使用，通过在头端产生扭转应变并且当扭转应变通过双极磁体组件时检测电响应。

公开(公告)号：US4995019A

公开(公告)日：1991-02-19

申请号：US534187

申请日：1990-06-06

Applicant: John Begin

Inventor： John Begin

IPC: G04F10/00

CPC classification number: G04F10/00

Abstract: An adaptive time period measurement technique which provides full speed for every measurement period with increased resolution afforded from repeated measurements. The time measure is produced by adaptively filtering a number of prior time measures. Each measurement includes a count and a fractional part from a controlled variable delay interposed in the measurement system. This variable delay is controlled over a number of measurements to cover the entire range of one clock cycle, preferably in accordance with a reversed binary progression algorithm. The adaptive filtering is preferably a self-modifying, classic low pass filter with a roll off which depends on the rate of change and direction of change of the measurerd time period. Thus the present invention provides all the resolution feasible based upon the rate of change of the measured quantity.

Abstract translation: 一种自适应时间周期测量技术，可以通过重复测量提供的分辨率提高每个测量周期的全速。 时间测量是通过自适应过滤多个先前的时间测量产生的。 每个测量包括插入在测量系统中的受控变量延迟的计数和小数部分。 这种可变延迟在多个测量中被控制以覆盖一个时钟周期的整个范围，优选地根据反向二进制递进算法。 自适应滤波优选地是具有滚降的自修正的经典低通滤波器，其取决于测量速率和测量时间段的变化方向。 因此，本发明提供了基于所测量的变化率可行的所有分辨率。

公开(公告)号：US5017867A

公开(公告)日：1991-05-21

申请号：US448164

申请日：1989-12-08

Applicant: Arthur Dumais ,  Richard D. Koski

Inventor： Arthur Dumais ,  Richard D. Koski

IPC: G01B7/00 ,  G01F23/296 ,  G01F23/68 ,  G01F23/72

CPC classification number: G01F23/68 ,  G01B7/003 ,  G01F23/2963 ,  G01F23/72

Abstract: A magnetostrictive linear displacement detector with increased position resolution includes a magnetostrictive wire anchored at opposite head and foot ends with a reflection termination at the foot end and a damping termination at the head end. A return wire is connected to the foot end of the magnetostrictive wire. The magnetostrictive wire is electrically excited at its head end. A variable position to be detected is represented by a magnet disposed for displacement along the magnetostrictive wire. A torsional motion sensor at the head end generates an electrical indication of the torsional motion within the magnetostrictive wire induced by passage of the electrical excitation by the position of the magnet. The displacement is determined from the interval of time between the detection of the torsional motion traveling directly from the magnet and the detection of the torsional motion reflected from the reflection termination. The reflection termination preferably consists of a brass cylindrical torus having a hole through which said magnetostrictive wire is passed and attached via a set screw. In an alternative embodiment the magnetostrictive wire is torsionally excited and the responses are detected electrically.

Abstract translation: 具有增加的位置分辨率的磁致伸缩线性位移检测器包括在相对的头部和脚端处锚固的磁致伸缩线，并且在端部处具有反射终端，并且在头端处具有阻尼终端。 返回线连接到磁致伸缩线的脚端。 磁致伸缩线在其头端被电激励。 要检测的可变位置由设置用于沿着磁致伸缩线的位移的磁体表示。 头端的扭转运动传感器产生由磁激励通过磁体位置而引起的磁致伸缩线内的扭转运动的电指示。 从检测直接从磁体的扭转运动与从反射终端反射的扭转运动的检测之间的时间间隔确定位移。 反射终端优选地由具有孔的黄铜柱形圆环组成，所述磁致伸缩线通过该孔穿过并通过固定螺钉附接。 在替代实施例中，磁致伸缩线被扭转激励，并且电响应被检测。

公开(公告)号：US4839590A

公开(公告)日：1989-06-13

申请号：US100535

申请日：1987-09-24

Applicant: Richard D. Koski ,  William C. Kosco ,  Arthur Dumais

Inventor： Richard D. Koski ,  William C. Kosco ,  Arthur Dumais

IPC: G01B7/00 ,  G01F23/296 ,  G01F23/68 ,  G01F23/72

CPC classification number: G01F23/68 ,  G01B7/003 ,  G01F23/2963 ,  G01F23/72

Abstract: A liquid level detector of the type in which a magnetostrictive wire extends through the liquid level measurement range and is captured in a tensioned vertical orientation within a stainless steel tube. Liquid level is measured as a function of the time required for a torsional disturbance imparted the wire near the top to travel along the wire to a magnet which is contained within a liquid level float which slides up and down along the tube. The torsional disturbances imparted to the wire by means of a piezoelectric crystal to which the wire is easily clamped. Accuracy is enhanced by measuring liquid level as a function of the elapsed time between an actuation signal and the first zero crossing of the voltage which is induced as the torsional strain passes through the area of influence of the sliding magnet.

Abstract translation: 一种液位检测器，其中磁致伸缩丝线延伸穿过液位测量范围，并以不锈钢管内的张紧垂直取向捕获。 液位测量是根据施加在顶部附近的钢丝沿着钢丝行进的扭转扰动所需的时间的函数来测量的，该磁体被包含在沿着管上下滑动的液位浮子内。 通过压电晶体赋予电线的扭转干扰，电线易于夹紧。 通过测量作为在扭转应变通过滑动磁体的影响区域而引起的电压的致动信号和第一过零点之间经过的时间的函数的液位，来提高精度。

公开(公告)号：US5227965A

公开(公告)日：1993-07-13

申请号：US665566

申请日：1991-03-06

Applicant: Carl D. Klaes ,  Anthony A. Slominski

Inventor： Carl D. Klaes ,  Anthony A. Slominski

IPC: G05B19/042

CPC classification number: G05B19/042 ,  G05B2219/2207 ,  G05B2219/25045 ,  G05B2219/25405

Abstract: A programmable limit switch employs high speed special purpose hardware and a general purpose microcontroller to achieve high speed limit switch operation. A state sequencer controls the high speed special purpose hardware in a fixed sequence. The state sequencer latches position data, and recalls position offsets from a memory. A hardware digital adder sums the position and offset with this summed offset position used as an address in output tables for selecting an output status word. The microcontroller operates asynchronously with respect to the state sequencer. The microcontroller initializes and updates the memories. The microcontroller calculates the velocity from repetitive position signals and writes the corresponding window offsets to memory. A selection circuit picks out the status bit of the particular output circuit. Thus unique ON/OFF offsets can be used for each circuit. The outputs are shifted together and latched to the output drivers. By this method the output update time is dependent on the rate of the state sequencer. Using fast logic the update time is greatly reduced over a software only implementation even by very fast microcontrollers.

Abstract translation: 可编程限位开关采用高速专用硬件和通用微控制器实现高速限位开关操作。 状态定序器以固定的顺序控制高速专用硬件。 状态定序器锁定位置数据，并从存储器调用位置偏移。 硬件数字加法器将位置和偏移量与用作选择输出状态字的输出表中的地址相加的该相加的偏移位置相加。 微控制器相对于状态定序器异步运行。 微控制器初始化和更新存储器。 微控制器从重复位置信号计算速度，并将相应的窗口偏移量写入存储器。 选择电路选出特定输出电路的状态位。 因此，每个电路可以使用唯一的ON / OFF偏移。 输出一起移动并锁存到输出驱动器。 通过这种方法，输出更新时间取决于状态顺控程序的速率。 使用快速逻辑，即使是非常快速的微控制器，更新时间也比软件实现大大减少。

公开(公告)号：US5212444A

公开(公告)日：1993-05-18

申请号：US738613

申请日：1991-07-31

Applicant: Igor A. Abramovich ,  Neil McKenna

Inventor： Igor A. Abramovich ,  Neil McKenna

IPC: G01B7/00 ,  G01B7/02 ,  G01D1/18 ,  G01D5/48 ,  G01F23/296

CPC classification number: G01D1/18 ,  G01B7/003 ,  G01B7/02 ,  G01D5/485 ,  G01F23/2963

Abstract: A damped sine wave detector for detecting the response of a magnetostrictive displacement transducer. A pretrigger comparator compares the signal to a predetermined negative threshold. A signal comparator compares the input signal to a predetermined positive threshold. The pretrigger comparator turns on a pretrigger flip-flop and starts a delay timer when the input signal falls below the predetermined negative threshold. The pretrigger flip-flop supplies the data input of a signal flip-flop. The signal flip-flop is clocked by the signal comparator when the input signal is above the predetermined positive threshold. The signal flip-flop turns on if clocked and the pretrigger flip-flop is on. The detector includes two timers for resetting the flip-flops. An inhibit timer resets both flip-flops upon expiration of an inhibit time longer than the maximum expected duration of the damped sine wave signal. A delay timer resets only the pretrigger flip-flop after a delay time greater than the maximum expected interval between when the damped sine wave falls below the predetermined negative threshold and when the damped sine wave rises above the predetermined positive threshold. Thus the circuit is less sensitive to noise.

Abstract translation: 用于检测磁致伸缩位移传感器的响应的阻尼正弦波检测器。 预触发比较器将信号与预定的负阈值进行比较。 信号比较器将输入信号与预定的正阈值进行比较。 预触发比较器打开预触发器触发器，并且当输入信号低于预定负阈值时启动延迟定时器。 预触发器触发器提供信号触发器的数据输入。 当输入信号高于预定的正阈值时，信号触发器由信号比较器计时。 信号触发器在时钟状态下亮起，触发前触发器亮起。 检测器包括两个用于复位触发器的定时器。 禁止定时器在超过阻尼正弦波信号的最大预期持续时间的禁止时间期满时复位两个触发器。 在延迟时间大于阻尼正弦波下降到预定负阈值之前以及当阻尼正弦波上升到高于预定正阈值时的最大预期间隔之后，延迟定时器仅复位预触发器触发器。 因此，电路对噪声不那么敏感。

公开(公告)号：US5050430A

公开(公告)日：1991-09-24

申请号：US540568

申请日：1990-06-19

Applicant: John D. Begin ,  Richard D. Koski

Inventor： John D. Begin ,  Richard D. Koski

IPC: G01B7/00 ,  G01D5/48 ,  G01D21/02 ,  G01F23/296 ,  G01F23/68 ,  G01F23/72 ,  G01K1/02

CPC classification number: G01B7/003 ,  G01D21/02 ,  G01D5/485 ,  G01F23/2963 ,  G01F23/68 ,  G01F23/72 ,  G01K1/026

Abstract: The present invention is a combined magnetostrictive linear displacement detector and plural location temperature detector. The combined apparatus produces a composite signal for transmission on a 2 wire transmission line. The resistances of the temperature sensitive resistors as well as two reference resistors are measured in a predetermined sequence. The linear displacement is measured by the length of time required for a torsional strain to travel along the magnetostrictive wire to the position of the magnet. A pulse generator generates a predetermined number of pulses for each resistance measurement having pulse period corresponding to the measured resistance, with the minimum such pulse period preferably being greater than twice the maximum time required for a torsional strain to propagate the length of the magnetostrictive wire. An electrical signal is supplied to the transmission line when either said pulse generator generates a pulse or the induced electrical signal is detected. The time between the pairs of pulses indicates the linear displacement fixed by the magnet. The time between pulse pairs is a measure of one of the resistances. The combined apparatus of the present invention also periodically degausses the magneteostrictive wire at a time when no displacement measurement is taking place.

Abstract translation: 本发明是组合磁致伸缩线性位移检测器和多位置温度检测器。 组合设备产生用于在2线传输线上传输的复合信号。 以预定的顺序测量温度敏感电阻器和两个参考电阻器的电阻。 线性位移通过扭转应变沿着磁致伸缩线行进到磁体位置所需的时间长度来测量。 脉冲发生器为每个电阻测量产生预定数量的脉冲，脉冲周期对应于测量的电阻，最小脉冲周期优选大于扭转应变传播磁致伸缩线长度所需的最大时间的两倍。 当所述脉冲发生器产生脉冲或检测到感应的电信号时，电信号被提供给传输线。 两对脉冲之间的时间表示由磁体固定的线性位移。 脉冲对之间的时间是电阻之一的量度。 本发明的组合装置在不进行位移测量的时刻也周期性地消磁磁致伸缩导线。