SCANNING CALIPER AND BASIS WEIGHT SENSOR FOR SHEET PRODUCT USING TERAHERTZ

    公开(公告)号:WO2019173900A1

    公开(公告)日:2019-09-19

    申请号:PCT/CA2019/050259

    申请日:2019-03-05

    Abstract: Time-of-flight measurements calculate the absolute caliper of a moving film independent of the film's index of refraction. A reflective fiber coupled terahertz gauge is mounted co-axially with a temperature stabilized Z-sensor positioned within a scanner head. The terahertz gauge monitors four reflections: (1) the reflection from a sensor window, (2, 3) the reflections from the top and bottom surfaces of the sheet product being measured, and (4) the reflection from a reflector that is placed behind the sheet. The Z-sensor monitors the distance between the reflector and the senor window. The terahertz reflection delays together with the Z distance measurements allow extraction of the caliper. Since the time delay due to the sheet is a function of thickness and index of refraction, the basis weight of the sheet can be determined by using a calibration of the sensor relating basis weight of the product to time delay.

    HOLMIUM OXIDE GLASSES AS CALIBRATION STANDARDS FOR NEAR INFRARED MOISTURE SENSORS
    2.
    发明申请
    HOLMIUM OXIDE GLASSES AS CALIBRATION STANDARDS FOR NEAR INFRARED MOISTURE SENSORS 审中-公开
    氧化镁玻璃作为近红外湿度传感器的校准标准

    公开(公告)号:WO2017031569A1

    公开(公告)日:2017-03-02

    申请号:PCT/CA2016/000216

    申请日:2016-08-24

    CPC classification number: G01N21/3559 G01N21/278

    Abstract: Near infrared moisture sensors using stable holmium oxide glass calibration standards that simulate different moistures levels in paper obviates problems associated with glass encased paper samples. Holmium oxide glass has a strong absorption at 1.93 microns which is close to absorption by paper. Standards can have varying thicknesses to simulate different moisture levels. Didymium glass can also be used with holmium oxide glass. The moisture sensor operates at reference and measurement infrared regions of 1.94 microns and 1.8 microns, respectively.

    Abstract translation: 使用稳定的氧化钬玻璃校准标准的近红外湿度传感器可以模拟纸中不同的湿度水平,从而避免与玻璃包装纸样品相关的问题。 氧化钬玻璃在1.93微米处具有很强的吸收,其接近纸吸收。 标准品可以有不同的厚度来模拟不同的水分含量。 钕玻璃也可与氧化钬玻璃一起使用。 湿度传感器分别在1.94微米和1.8微米的参考和测量红外区域工作。

    MODULAR SENSING SYSTEM FOR WEB-BASED APPLICATIONS
    3.
    发明申请
    MODULAR SENSING SYSTEM FOR WEB-BASED APPLICATIONS 审中-公开
    基于WEB应用的模块化感应系统

    公开(公告)号:WO2016044916A1

    公开(公告)日:2016-03-31

    申请号:PCT/CA2015/000499

    申请日:2015-09-23

    Abstract: A system includes at least one common support (202, 208a, 208b) configured to span at least a width of a web (108) of material in a manufacturing or processing system (100). The system also includes multiple sensor heads (204a, 204b, 204c) each configured to move independently along at least part of the at least one common support. The sensor heads can be configured to move simultaneously along the at least one common support, and at least one controller (104, 310a, 310b) can be configured to control movement of the sensor heads so that the sensor heads do not contact one another. Each sensor head could include one or more sensors (304a, 304b) configured to measure one or more characteristics of the web. Different sensor heads could include different types of sensors. The sensor heads can be configured to move in non-overlapping patterns over or under the web. Different sensor heads can be configured to move at different speeds.

    Abstract translation: 一种系统包括至少一个公共支撑件(202,208a,208b),其构造成跨越制造或处理系统(100)中的材料的幅材(108)的至少一个宽度。 该系统还包括多个传感器头(204a,204b,204c),每个传感器头被配置为沿着至少一个共同支撑件的至少一部分独立地移动。 传感器头可以被配置成沿着至少一个公共支撑件同时移动,并且至少一个控制器(104,310a,310b)可被配置成控制传感器头的运动,使得传感器头不彼此接触。 每个传感器头可以包括被配置成测量网的一个或多个特性的一个或多个传感器(304a,304b)。 不同的传感器头可以包括不同类型的传感器。 传感器头可以被配置为以非重叠的图案在网上或下方移动。 不同的传感器头可以配置为以不同的速度移动。

    ROBUST TERAHERTZ SPECTROMETER CONFIGURATION AGAINST SCANNER HEADS MISALIGNMENT
    4.
    发明申请
    ROBUST TERAHERTZ SPECTROMETER CONFIGURATION AGAINST SCANNER HEADS MISALIGNMENT 审中-公开
    强大的TERAHERTZ光谱仪配置对扫描仪头部缺失

    公开(公告)号:WO2015179946A1

    公开(公告)日:2015-12-03

    申请号:PCT/CA2015/000303

    申请日:2015-05-07

    Inventor: SAVARD, Stephane

    CPC classification number: G01J3/42 G01J3/021 G01J3/108 G01N21/3586

    Abstract: Robust terahertz time-domain spectrometer has a reflective surface arrangement that renders the sensor insensitive to x or y displacement. The apparatus includes: (a) first scanner head; (b) a first reflective surface; (c) emitter; (d) beam splitter to yield reference radiation pulses and sample radiation pulses; (e) first reflector to reflect sample radiation pulses that have been transmitted through the sample to generate reflected sample radiation pulses that are directed towards a web; (f) second reflector that reflects the reference radiation pulses to generate reflected reference radiation pulses that are directed towards the beam splitter which in turn transmits a portion of the reflected references radiation pulses towards the web; and (g) a detector that receives (i) the reflected sample radiation pulses that have interacted with the sample a plurality of times and (ii) reflected reference radiation pulses that have interacted with the sample a plurality of times.

    Abstract translation: 坚固的太赫兹时域光谱仪具有使得传感器对x或y位移不敏感的反射表面布置。 该装置包括:(a)第一扫描头; (b)第一反射面; (c)发射器; (d)分束器以产生参考辐射脉冲和采样辐射脉冲; (e)第一反射器以反射已经透射通过样品的样品辐射脉冲,以产生指向幅材的反射样品辐射脉冲; (f)第二反射器,其反射参考辐射脉冲以产生反射的参考辐射脉冲,所述反射参考辐射脉冲指向分束器,所述反射参考辐射脉冲又将反射的参考辐射脉冲的一部分朝向幅材传送; 和(g)检测器,其接收(i)多次与样本相互作用的反射样品辐射脉冲,和(ii)多次与样本相互作用的反射参考辐射脉冲。

    AUTOMATED UPPER/LOWER HEAD CROSS DIRECTION ALIGNMENT BASED ON MEASUREMENT OF SENSOR SENSITIVITY
    6.
    发明申请
    AUTOMATED UPPER/LOWER HEAD CROSS DIRECTION ALIGNMENT BASED ON MEASUREMENT OF SENSOR SENSITIVITY 审中-公开
    基于测量传感器灵敏度的自动上/下方头交叉方向对齐

    公开(公告)号:WO2016026027A1

    公开(公告)日:2016-02-25

    申请号:PCT/CA2015/000474

    申请日:2015-08-20

    CPC classification number: G01B11/272 G01B21/24

    Abstract: A method includes moving (404) a first sensor assembly (108, 110) to a plurality of cross direction positions (500, 600) relative to a second sensor assembly (110, 108), where the first and second sensor assemblies are configured to move in the cross direction relative to a web (102) of material. The method also includes, for each of the plurality of cross direction positions, determining (406) a sensor value associated with a sensor source (212a, 212b) disposed at the second sensor assembly as measured by a sensor receiver (212b, 212a) disposed at the first sensor assembly. The method further includes determining (410) a starting alignment position (500a, 600a) of the first sensor assembly to be a first cross direction position where a difference between the sensor value at the first cross direction position and a corresponding sensor value at one or more adjacent cross direction positions is a minimum.

    Abstract translation: 一种方法包括相对于第二传感器组件(110,108)移动(404)第一传感器组件(108,110)到多个横向位置(500,600),其中第一和第二传感器组件被配置为 相对于材料的网(102)在横向方向上移动。 所述方法还包括对于所述多个横向位置中的每一个,确定(406)与设置在所述第二传感器组件处的传感器源(212a,212b)相关联的传感器值,所述传感器源设置在由传感器接收器(212b,212a) 在第一传感器组件。 该方法还包括确定(410)第一传感器组件的起始对准位置(500a,600a)为第一横向位置,其中第一横向位置处的传感器值与相应的传感器值之间的差在一个或 更邻近的横向位置是最小的。

    METHOD AND APPARATUS FOR DESIGNING MODEL-BASED CONTROL HAVING TEMPORALLY ROBUST STABILITY AND PERFORMANCE FOR MULTIPLE-ARRAY CROSS-DIRECTION (CD) WEB MANUFACTURING OR PROCESSING SYSTEMS OR OTHER SYSTEMS

    公开(公告)号:WO2018161148A1

    公开(公告)日:2018-09-13

    申请号:PCT/CA2018/000046

    申请日:2018-03-02

    Abstract: A method includes obtaining (902) a model (304) associated with a model-based controller (104, 306) in an industrial process (100, 302) having multiple actuator arrays (114, 116, 118, 120) and performing (914) temporal tuning of the controller. The temporal tuning includes adjusting one or more parameters of a multivariable filter (308) used to smooth reference trajectories of actuator profiles of the actuator arrays. The temporal tuning could also include obtaining (904) one or more uncertainty specifications for one or more temporal parameters of the model, obtaining (916) one or more overshoot limits for the actuator profiles, identifying (918) a minimum bound for profile trajectory tuning parameters, and identifying (920) one or more of the profile trajectory tuning parameters that minimize one or more measurement settling times without exceeding the one or more overshoot limits. The controller could be configured to use the adjusted parameter(s) during control of the industrial process such that the adjusting of the parameter(s) alters operation of the controller and the industrial process.

    METHOD AND APPARATUS FOR DESIGNING MODEL-BASED CONTROL HAVING SPATIAL ROBUSTNESS FOR MULTIPLE-ARRAY CROSS- DIRECTION (CD) WEB MANUFACTURING OR PROCESSING SYSTEMS OR OTHER SYSTEMS

    公开(公告)号:WO2018161147A1

    公开(公告)日:2018-09-13

    申请号:PCT/CA2018/000045

    申请日:2018-03-02

    Abstract: A method includes obtaining (902) one or more models (304) associated with a model-based controller (104, 306) in an industrial process (100, 302) having multiple actuator arrays (114, 116, 118, 120) and performing (906) spatial tuning of the controller. The spatial tuning includes identifying weighting matrices that suppress one or more frequency components in actuator profiles of the actuator arrays. The spatial tuning could also include finding (908) a worst-case cutoff frequency over all output channels for each process input, designing (910) the weighting matrices to penalize higher-frequency actuator variability based on the model(s) and the cutoff frequencies, and finding (912) a multiplier for a spatial frequency weighted actuator variability term in a function that guarantees robust spatial stability. The controller could be configured to use a function during control of the industrial process, where a change to one or more terms of the function alters operation of the controller and the industrial process and at least one term is based on the weighting matrices.

    LAYERED APPROACH TO ECONOMIC OPTIMIZATION AND MODEL-BASED CONTROL OF PAPER MACHINES AND OTHER SYSTEMS
    9.
    发明申请
    LAYERED APPROACH TO ECONOMIC OPTIMIZATION AND MODEL-BASED CONTROL OF PAPER MACHINES AND OTHER SYSTEMS 审中-公开
    纸张机械及其他系统的经济优化和基于模型的控制的层次化方法

    公开(公告)号:WO2016205920A1

    公开(公告)日:2016-12-29

    申请号:PCT/CA2016/000171

    申请日:2016-06-17

    Inventor: FORBES, Michael

    CPC classification number: G05B13/021 G05B9/02

    Abstract: A method includes executing (302) a control algorithm for an industrial process using a controller objective function, where the industrial process is associated with at least one controlled variable. The method also includes executing (306) an optimization algorithm for the industrial process using an extended version of the controller objective function. The extended version of the controller objective function includes one or more additional terms added to the controller objective function, and one or more results of the optimization algorithm are provided to the control algorithm. The method further includes, based on tracking errors associated with the at least one controlled variable, adjusting (314) at least one adaptive weight parameter in the extended version of the controller objective function. The at least one adaptive weight parameter is associated with at least one of the one or more additional terms.

    Abstract translation: 一种方法包括使用控制器目标函数来执行(302)用于工业过程的控制算法,其中工业过程与至少一个受控变量相关联。 该方法还包括使用控制器目标函数的扩展版本来执行(306)用于工业过程的优化算法。 控制器目标函数的扩展版本包括添加到控制器目标函数中的一个或多个附加项,并且将优化算法的一个或多个结果提供给控制算法。 该方法还包括:基于与所述至少一个受控变量相关联的跟踪误差,在所述控制器目标函数的扩展版本中调整(314)至少一个自适应权重参数。 所述至少一个自适应权重参数与所述一个或多个附加项中的至少一个相关联。

    SPECTROSCOPIC SENSOR FOR THICKNESS OR WEIGHT MEASUREMENT OF THIN PLASTIC FILMS
    10.
    发明申请
    SPECTROSCOPIC SENSOR FOR THICKNESS OR WEIGHT MEASUREMENT OF THIN PLASTIC FILMS 审中-公开
    用于薄膜厚度或重量测量的光谱传感器

    公开(公告)号:WO2016149790A1

    公开(公告)日:2016-09-29

    申请号:PCT/CA2016/000073

    申请日:2016-03-14

    Abstract: Continuous on-line thin film measurements employ a sensor having a spectrometer for interferometric measurements and a stack of single channel detectors for adsorption measurements. The stack is separated from the spectrometer, which analyzes radiation that emerges (transmitted pass or reflected from) the film, whereas the stack analyzes radiation that has passed through the film multiple times. The spectrometer is (i) positioned directly opposite the source of radiation so that it detects transmitted radiation or (ii) disposed on the same side of the film as is the source of radiation so that the spectrometer detects radiation that is specularly reflected from the film. The sensor includes a broadband radiation source emitting visible to far infrared light which propagates through a measurement cell defined by reflective surfaces exhibiting Lambertian-type scattering. The sensor is capable of measuring thin plastic films with thicknesses down to 1 micron or less.

    Abstract translation: 连续在线薄膜测量使用具有用于干涉测量的光谱仪的传感器和用于吸附测量的单通道检测器的堆叠。 堆叠与光谱仪分离,光谱仪分析出现(辐射通过或从膜反射)的辐射,而堆叠分析已经通过膜的辐射多次。 光谱仪是(i)与辐射源直接相对放置,以便其检测透射辐射,或(ii)设置在与辐射源相同的膜侧,使得光谱仪检测从膜的镜面反射的辐射 。 传感器包括向远红外光发射可见的宽带辐射源,其传播通过表现朗伯型散射的反射表面限定的测量单元。 传感器能够测量厚度低于1微米或更小的薄塑料薄膜。

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