中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

223 records (took 0.024 seconds)

    REACTANCE MEASUREMENT CIRCUIT
    52.
    发明专利
    REACTANCE MEASUREMENT CIRCUIT 未知

    公开(公告)号：HK89985A

    公开(公告)日：1985-11-22

    申请号：HK89985

    申请日：1985-11-14

    Applicant: ROSEMOUNT INC

    Inventor： RUESCH JAMES R ,  FRICK ROGER L ,  GRINDHEIM EARL A

    IPC: G01D5/12 ,  G01D5/24 ,  G01L9/12 ,  G01R27/26 ,  G08C19/02

    Abstract: A circuit for measuring the reactance of an AC reactance sensor which varies responsive to a condition to be sensed, such as pressure, is disclosed. The circuit comprises an oscillator coupled to the sensor for providing a time varying oscillator signal having a variable frequency and a substantially constant peak to peak voltage to the sensor, and a plurality of rectifiers coupled to the oscillator and to the sensor for providing the oscillator signal as a charging signal to the sensor and for providing discharging signals from the sensor, the discharging signals being a function of the reactance of the sensor, and an amplifier coupled to the rectifiers and to the oscillator for providing an input control signal to the oscillator to control the frequency of the oscillator signal as a function of the reactance of the sensor.

    REACTANCE MEASUREMENT CIRCUIT
    54.
    发明专利
    REACTANCE MEASUREMENT CIRCUIT 未知

    公开(公告)号：GB2106255A

    公开(公告)日：1983-04-07

    申请号：GB8225577

    申请日：1982-01-18

    Applicant: ROSEMOUNT INC

    Inventor： FRICK ROGER L ,  GRINDHEIM EARL A ,  RUESCH JAMES R

    IPC: G01D5/12 ,  G01D5/24 ,  G01L9/12 ,  G01R27/26 ,  G08C19/02

    Abstract: A circuit for measuring the reactance of an AC reactance sensor which varies responsive to a condition to be sensed, such as pressure, is disclosed. The circuit comprises an oscillator coupled to the sensor for providing a time varying oscillator signal having a variable frequency and a substantially constant peak to peak voltage to the sensor, and a plurality of rectifiers coupled to the oscillator and to the sensor for providing the oscillator signal as a charging signal to the sensor and for providing discharging signals from the sensor, the discharging signals being a function of the reactance of the sensor, and an amplifier coupled to the rectifiers and to the oscillator for providing an input control signal to the oscillator to control the frequency of the oscillator signal as a function of the reactance of the sensor.

    DIFFERENTIAL PRESSURE TRANSDUCER
    57.
    发明专利
    DIFFERENTIAL PRESSURE TRANSDUCER 未知

    公开(公告)号：CA944579A

    公开(公告)日：1974-04-02

    申请号：CA96047

    申请日：1970-10-20

    Applicant: ROSEMOUNT INC

    Inventor： FRICK ROGER L

    IPC: G01L9/12 ,  G01L9/00 ,  G01L13/02

    Abstract: 1318780 Pressure transducers ROSEMOUNT ENG CO 20 Oct 1970 [27 Oct 1969] 49768/70 Heading G1N A differential pressure transducer comprises a movable metal diaphragm 28 which forms with metallic layers 39, 40 the electrodes of a differential capacitor, the diaphragm communicating with first and second isolation diaphragms 44, 45 by way of oil-filled chambers and passageways 31, 32, and the glass insulation filling the cavities 29, and on concave surfaces of which the metallic layers are deposited, serving as a mechanical stop for deflection of the metal diaphragm before an isolation diaphragm can be engaged by an adjacent surface 31. Metal tubes 34 are electrically connected with the layers 39, 40 and serve as leads to the capacitor, the movable electrode of which is connected to the metal housing 27. The tubes also provide for filling the transducer with oil. Ceramic tubes 33 having axially extending openings are provided in the passageways 32 and fused into the glass during manufacture. The isolation diaphragms are corrugated and of stainless steel whilst layers 39, 40 are nickel.

    58.
    发明专利
    未知

    公开(公告)号：DE2344530A1

    公开(公告)日：1974-03-14

    申请号：DE2344530

    申请日：1973-09-04

    Applicant: ROSEMOUNT INC

    Inventor： FRICK ROGER L

    IPC: G01L9/00 ,  G01L13/02 ,  F15B3/00

    Abstract: A diaphragm construction for a differential pressure transducer wherein the diaphragm is deflected under pressure, and which has means around the periphery thereof to isolate the diaphragm stresses from the mounting portion of the diaphragm.

    Optical sensor for measuring physical and material properties
    60.
    发明专利
    Optical sensor for measuring physical and material properties 未知

    公开(公告)号：GB2391617B

    公开(公告)日：2005-05-18

    申请号：GB0312380

    申请日：2001-11-28

    Applicant: ROSEMOUNT INC

    Inventor： FRICK ROGER L

    IPC: G01D5/26 ,  G01D5/353 ,  H01S3/00 ,  H01S3/06 ,  H01S3/08 ,  H01S3/083 ,  H01S3/091 ,  H01S3/0933 ,  H01S3/10 ,  H01S5/14 ,  H01S5/183

    Abstract: An optical medium having a cavity that defines a variable gap is provided. The optical medium is used in an optical sensor, laser, and variable frequency resonator, by way of example. The cavity is physically altered in response to changes in a measurable parameter like pressure, temperature, force, flow rate, and material composition. The optical medium is characterized in some embodiments by having a cavity disposed near or within a high Q optical resonator. The optical resonator can be formed by various structures of which Bragg reflector cavities, ring resonators, microdiscs, and microspheres are examples. The optical resonator is preferably coupled to a laser source. The altering of the cavity affects the resonance condition within the optical resonator and thereby the laser signal of the system. If the laser source is a mode locked laser, the repetition rate of the pulse train changes in response to changes in the measurable parameter. If the laser source is a CW source the frequency of the laser signal is dependent upon a measurable parameter.

Patent Agency Ranking