Measurement of soil moisture
    1.
    发明授权
    Measurement of soil moisture 失效
    测量土壤水分

    公开(公告)号:US4341112A

    公开(公告)日:1982-07-27

    申请号:US162093

    申请日:1980-06-23

    IPC分类号: G01N22/04 G01N27/02

    CPC分类号: G01N22/04

    摘要: A method and apparatus for measuring the moisture content of bulk material which involves placing a length of leaky co-axial cable in the bulk material so as to be buried therein and spaced from an electro-magnetic sensor in the region of interest. A signal of high frequency electro-magnetic energy is injected into the cable, and at least one of phase and time of arrival of the signal at the sensor with respect to the injected signal is measured and therefrom the moisture content of the material determined. The electro-magnetic sensor is preferably a second leaky co-axial cable buried in the bulk material and spaced a selected distance from the first coaxial cable and parallel thereto. The spacing therebetween the coaxial cables is in the range of one to fifty feet and the frequency of the electro-magnetic energy is in the range of 20-500 MHz.

    摘要翻译: 一种用于测量散装材料的水分含量的方法和装置,其包括将一长度的泄漏的同轴电缆放置在散装材料中,以便被埋在其中并与感兴趣区域中的电磁传感器间隔开。 将高频电磁能的信号注入到电缆中,并且测量信号相对于注入的信号在传感器处的相位和时间到达中的至少一个,从而确定材料的含水量。 电磁传感器优选地是埋在散装材料中并与第一同轴电缆间隔开一定距离并与之平行的第二泄漏同轴电缆。 同轴电缆之间的间隔在一至五十英尺的范围内,电磁能的频率在20-500MHz的范围内。

    Wireless Intraocular Pressure Sensor
    2.
    发明公开

    公开(公告)号:US20240341598A1

    公开(公告)日:2024-10-17

    申请号:US18633882

    申请日:2024-04-12

    发明人: Yong Jun Lai

    IPC分类号: A61B3/16

    CPC分类号: A61B3/16

    摘要: Apparatus and method for measuring and monitoring intraocular pressure (IOP) of a subject includes a contact lens disposed on the subject's eye, the contact lens having a polymer matrix and a nanowire network embedded in the polymer matrix. An electrically conductive coil is disposed in close proximity to the contact lens such that it electromagnetically couples with the nanowire network of the contact lens. A resonant frequency of the electrically conductive coil is measured and correlated with the IOP of the subject. Changes in IOP result in deformation of the nanowire network of the contact lens and a resulting change in the resonant frequency, which is measured and correlated with the change in IOP. The electrically conductive coil is adapted to be worn by the subject and may be mounted on a pair of glasses.

    Electrochemical Analysis of Water with Multiplex Electrodes

    公开(公告)号:US20240329025A1

    公开(公告)日:2024-10-03

    申请号:US18619477

    申请日:2024-03-28

    IPC分类号: G01N33/18 G01N27/30

    CPC分类号: G01N33/1813 G01N27/301

    摘要: Methods and apparatus for analyzing water use a plurality of working electrodes and at least one counter electrode adapted to be in contact with the water, and a source of electrical potential difference that simultaneously applies to each of the plurality of working electrodes a different potential selected from at least one range of potentials. A multichannel device obtains chronoamperometry measurements from the plurality of working electrodes. The chronoamperometry measurements are used to generate a pattern of electrical charge on the plurality of electrodes, and the pattern of electrical charge is correlated with one or more known patterns to perform one or more of: identify one or more analytes in the water, perform speciation of analytes, and determine one or more concentration of the one or more analytes in the water.

    Method and apparatus for assessing sensorimotor performance

    公开(公告)号:US11547325B2

    公开(公告)日:2023-01-10

    申请号:US16408656

    申请日:2019-05-10

    IPC分类号: A61B5/11 A61B5/16 A61B5/00

    摘要: A method and apparatus for quantifying differences in human sensorimotor performance useful for diagnosing, assessing, and/or detecting brain injury and/or a neurological disorder, or identifying exceptional performance in a subject. In a task a subject's limb movement is restricted to a limited workspace and an object moves towards the limb. The objective of the task is for the subject to contact the object with the limb within a set time period. During the task a perturbation directed to the object and/or limb, or other feature of the environment, may occur on some trials, requiring a rapid motor correction in order to contact the object, or the subject may receive an alternative instruction on whether to interact with the object. Position data and/or motion data and/or kinetic data of the limb or portions thereof with respect to a presented object are obtained, and a data set is acquired for a plurality of trials. The acquired data set provides information about brain injury and/or a neurological disorder in the subject or exceptional capabilities of the subject.

    Methods and Circuits for Sensing Isolated Power Converter Output Voltage Across the Isolation Barrier

    公开(公告)号:US20220368238A1

    公开(公告)日:2022-11-17

    申请号:US17742846

    申请日:2022-05-12

    IPC分类号: H02M3/335

    摘要: A control circuit for an isolated power converter includes a first sensing circuit that senses a secondary side output voltage and produces a pulse wave modulation (PWM) signal having a duty cycle that is proportional to a value of the secondary side output voltage. The PWM is transferred across the converter isolation barrier to the primary side, and a primary side circuit receives the PWM signal and outputs a control signal. A controller determines the value of the secondary side output voltage from the control signal and uses the value to control primary side power switching devices of the isolated power converter to regulate the secondary side output voltage at a selected value.

    Intraocular Pressure Monitoring Contact Lens

    公开(公告)号:US20220218202A1

    公开(公告)日:2022-07-14

    申请号:US17614157

    申请日:2020-05-29

    摘要: A device for non-invasive monitoring and measuring of intraocular pressure (IOP) of a subject includes a flexible lens that fits on the eye and changes curvature in response to a change in curvature of the eye. A microchannel disposed in or on the lens has one or more ends that are open to the atmosphere and an indicator solution is disposed in a portion of the 5 microchannel. The microchannel exhibits a change in volume in response to a change in curvature of the lens, which results in a change in position of the indicator solution in the microchannel. The change in position of the indicator solution in the microchannel is indicative of a change in IOP. The change in position of the indicator solution may be detected in digital images of the lens taken with a camera of a mobile electronic device such 0 as a smartphone or a camera worn by the subject.