SELF-CALIBRATING POLYMER NANO COMPOSITE (PNC) SENSING ELEMENT

    公开(公告)号:US20210389265A1

    公开(公告)日:2021-12-16

    申请号:US17346049

    申请日:2021-06-11

    IPC分类号: G01N27/20

    摘要: Aspects of the present application allow for measurement of a calibrated resistance for a resistive film in a sensing element, such that effects from contact resistance and background resistance drifts due to factors such as temperature, strain or aging can be reduced or eliminated. In some embodiments, by taking a plurality of two-terminal resistance measurements between various pairs of electrodes on a resistive film, a contact-resistance-independent resistance of a reference portion of the resistive film can be determined. Further, a contact-resistance-independent resistance of a sensing portion of the resistive film can be determined based on a plurality of two-terminal resistance measurements between pairs of electrodes. The resistance of the reference portion can be removed from the measured resistance of the sensing portion, such that variations in the reference portion resistance that are not caused by a sensed environmental condition may be compensated.

    PASSIVE SENSOR SYSTEM WITH CARBON NANOTUBE COMPONENTS

    公开(公告)号:US20170358854A1

    公开(公告)日:2017-12-14

    申请号:US15618542

    申请日:2017-06-09

    发明人: Yosef Stein

    IPC分类号: H01Q1/36 H01Q1/24

    摘要: A passive wireless sensor system is disclosed that includes components fabricated from carbon nanotube (CNT) structures. In some situations, the passive wireless sensor system includes a CNT structure sensor and an antenna that communicates wirelessly by altering an impedance of the antenna. The passive wireless sensor system includes a non-battery-powered energy storage device that harvests energy from carrier signals received at the antenna. The antenna and the energy storage device can be formed from CNT structures.

    Passive sensor reader authentication protocol

    公开(公告)号:US11461454B2

    公开(公告)日:2022-10-04

    申请号:US15944732

    申请日:2018-04-03

    摘要: According to various aspects, systems and methods are provided for secure communication between a passive sensor node and a reader. A passive sensor node may be used for monitoring in a variety of situations. A reader may power the passive sensor while communicating with the passive sensor. In some scenarios, it may be necessary or desirable to provide security between the passive sensor and the reader. According to one aspect, the reader may send a first message initiating communication with the passive sensor, which may respond with a second message including encrypted data. An authorized reader may decrypt the data and respond with data encrypted based on the second message in a third message, which may be used by the device to authenticate the reader.

    Quadrature error correction using polynomial models in tone calibration
    6.
    发明授权
    Quadrature error correction using polynomial models in tone calibration 有权
    使用音调校准中的多项式模型进行正交误差校正

    公开(公告)号:US09281907B2

    公开(公告)日:2016-03-08

    申请号:US13897719

    申请日:2013-05-20

    IPC分类号: H04B1/16 H04B17/21 H04B17/391

    CPC分类号: H04B17/21 H04B17/391

    摘要: One example embodiment provides a system, apparatus, and method for using polynomial models in tone calibration for quadrature error correction in I/Q receivers. In one example embodiment, method for calibrating an I/Q receiver is provided and includes receiving a first mismatch parameter indicating a mismatch between I and Q channels of the I/Q receiver; and estimating a second mismatch parameter from the first mismatch parameter using a polynomial model.

    摘要翻译: 一个示例性实施例提供了一种用于在I / Q接收机中用于正交纠错的音调校准中的多项式模型的系统,装置和方法。 在一个示例实施例中,提供了用于校准I / Q接收机的方法,并且包括接收指示I / Q接收机的I和Q信道之间的失配的第一失配参数; 以及使用多项式模型从所述第一失配参数估计第二失配参数。

    QUADRATURE ERROR CORRECTION USING POLYNOMINAL MODELS IN TONE CALIBRATION
    7.
    发明申请
    QUADRATURE ERROR CORRECTION USING POLYNOMINAL MODELS IN TONE CALIBRATION 有权
    使用多边形模型在音调校准中的校正误差校正

    公开(公告)号:US20140273902A1

    公开(公告)日:2014-09-18

    申请号:US13897719

    申请日:2013-05-20

    IPC分类号: H04B17/00

    CPC分类号: H04B17/21 H04B17/391

    摘要: One example embodiment provides a system, apparatus, and method for using polynomial models in tone calibration for quadrature error correction in I/Q receivers. In one example embodiment, method for calibrating an I/Q receiver is provided and includes receiving a first mismatch parameter indicating a mismatch between I and Q channels of the I/Q receiver; and estimating a second mismatch parameter from the first mismatch parameter using a polynomial model.

    摘要翻译: 一个示例性实施例提供了一种用于在I / Q接收机中用于正交纠错的音调校准中的多项式模型的系统,装置和方法。 在一个示例实施例中,提供了用于校准I / Q接收机的方法,并且包括接收指示I / Q接收机的I和Q信道之间的失配的第一失配参数; 以及使用多项式模型从所述第一失配参数估计第二失配参数。

    WIRELESS SENSOR READER WITH SOFTWARE-CONTROLLED POWER EXCITER AND METHOD FOR OPERATING THE SAME

    公开(公告)号:US20210314871A1

    公开(公告)日:2021-10-07

    申请号:US16840274

    申请日:2020-04-03

    IPC分类号: H04W52/02

    摘要: A reader apparatus with software-controller power exciter, and methods for operating the same to wirelessly interrogate an environmental or structural sensor are disclosed. Some aspects of the application are directed to a reader apparatus that transmits high power for a fast cold start of a sensor and subsequently switch to low power transmission in response to an indication signal received from the sensor indicating that a state of charge of the sensor has reached a threshold value such that high power transmission is no longer necessary, thereby extending battery life of the reader apparatus.

    SYSTEMS AND METHODS FOR NARROWBAND SIGNAL QUADRATURE ERROR CORRECTION
    10.
    发明申请
    SYSTEMS AND METHODS FOR NARROWBAND SIGNAL QUADRATURE ERROR CORRECTION 有权
    用于窄带信号的系统和方法正交校正错误

    公开(公告)号:US20150288549A1

    公开(公告)日:2015-10-08

    申请号:US14657029

    申请日:2015-03-13

    发明人: Wei An Yosef Stein

    IPC分类号: H04L27/227 H04L7/00

    摘要: Apparatus and method for quadrature error correction for narrowband or tone signal are disclosed. An analog circuit receives a modulated signal and processes in-phase signal and quadrature-phase signal in in-phase and quadrature-phase signal paths respectively. A digital signal processor performs discrete Fourier transform on each of the in-phase and quadrature-phase signals and determines statistical parameters responsive to mismatch characteristics to estimate quadrature error correction.

    摘要翻译: 公开了用于窄带或音调信号的正交纠错的装置和方法。 模拟电路接收调制信号,分别处理同相和正交相信号路径中的同相信号和正交相位信号。 数字信号处理器对每个同相和正交相位信号执行离散傅立叶变换,并且确定响应失配特性的统计参数以估计正交误差校正。