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    • 4. 发明授权
    • Thermometric vapor sensor with evaporation surface having micropores
    • 具有蒸发表面的微孔蒸气传感器具有微孔
    • US06202480B1
    • 2001-03-20
    • US09054852
    • 1998-04-02
    • Ganapati R. MauzeMichael GreensteinPaul LumHewlett E. Melton, Jr.
    • Ganapati R. MauzeMichael GreensteinPaul LumHewlett E. Melton, Jr.
    • G01N2562
    • G01N25/64
    • A sensor for sensing in a gas stream a vapor of a liquid. The sensor includes a micropore and a wet temperature sensor. The micropore has an evaporation end and has a lumen to conduct liquid from a supply of the liquid for evaporation at the evaporation end. The wet temperature sensor has a heat sensitive part in contact with the liquid in the micropore. The heat sensitive part circumscribes the micropore and forms part of the lumen. Heat loss due to evaporation of the liquid when the wet temperature sensor wet with the liquid is placed in the gas stream will result in the temperature sensed by the wet temperature sensor being lower than the non-evaporative temperature of the gas stream. This lowering in temperature can be measured to determine the concentration of the vapor in the gas stream. An example of such a sensor has a thermocouple junction having micropores passing through the thermocouple junction.
    • 一种传感器,用于在气流中检测液体的蒸汽。 该传感器包括微孔和湿温度传感器。 微孔具有蒸发端,并且具有内腔以在蒸发端从用于蒸发的液体供应源输送液体。 湿式温度传感器具有与微孔中的液体接触的热敏部分。 热敏部分围绕微孔并形成管腔的一部分。 将潮湿的温度传感器用液体湿润时液体的蒸发导致的热损失被放置在气流中将导致由湿式温度传感器感测到的温度低于气流的非蒸发温度。 可以测量这种温度降低以确定气流中的蒸气的浓度。 这种传感器的示例具有热电偶结,其具有穿过热电偶结的微孔。
    • 9. 发明授权
    • Ultrasonic frequency-domain system and method for sensing fluid flow
    • 超声频域系统和感应流体流的方法
    • US5375600A
    • 1994-12-27
    • US104309
    • 1993-08-09
    • Hewlett E. Melton, Jr.King-Wah W. YeungMichael Greenstein
    • Hewlett E. Melton, Jr.King-Wah W. YeungMichael Greenstein
    • A61B8/06G01P5/00G01P13/00G01S15/58
    • G01S15/8984A61B8/06A61B8/488G01S15/582
    • Pulses of ultrasound are focused in the patient's body to create an interrogation volume where a characteristic of blood flow is to be measured. The bandwidth of the back-scattered Doppler return signal is measured. In order to measure flow velocity independent of direction, the interrogation volume is generated substantially as a sphere in which the range dimension is set equal to the lateral dimensions (azimuth and elevation) of the interrogation signal. The Doppler bandwidth is then scaled to provide a direction-independent measurement of flow velocity. In order to determine the direction of flow, the interrogation volume is generated substantially as an ellipsoid. The long axis of the ellipsoidal interrogation volume is then rotated until the measured Doppler bandwidth is at a minimum, which is reached when the long axis is aligned with the flow direction. The interrogation volume is preferably rotated and translated using differential phasing of the ultrasonic signals from different transducer elements in a two-dimensional array.
    • 超声波的脉冲聚焦在患者的身体中以产生要测量血流特征的询问体积。 测量背散射多普勒返回信号的带宽。 为了独立于方向测量流速,询问体积基本上产生为范围尺寸设置为等于询问信号的横向尺寸(方位角和仰角)的球体。 然后缩放多普勒带宽以提供流速独立的方向测量。 为了确定流动的方向,询问体积基本上产生为椭圆体。 然后旋转椭圆询问体积的长轴直到测量的多普勒带宽处于最小值,当长轴与流动方向对准时达到最小。 询问体积优选地以二维阵列使用来自不同换能器元件的超声波信号的微分相位来旋转和平移。
    • 10. 发明授权
    • Rotary encoder for intravascular ultrasound catheter
    • 旋转编码器用于血管内超声导管
    • US5485845A
    • 1996-01-23
    • US434616
    • 1995-05-04
    • Edward VerdonkMichael GreensteinHewlett E. Melton, Jr.Mir S. Seyed-Bolorforosh
    • Edward VerdonkMichael GreensteinHewlett E. Melton, Jr.Mir S. Seyed-Bolorforosh
    • A61B8/12A61B19/00G01S5/24G01S15/74G01S15/87G01S15/89
    • A61B8/12A61B8/445A61B8/4461G01S15/74G01S15/874G01S15/8943A61B2090/3929G01S5/24
    • An ultrasound system and method for intravascular ultrasonic imaging includes an array of beacons that are fixed to direct ultrasonic energy toward an imaging transducer, with individual beacons being identifiable in order to determine the angular position of the imaging transducer. Based upon the data related to beacon identification, operation of the imaging device is adaptively adjusted in order to compensate for variations in angular velocity of the transducer. Adaptive compensation may be performed by adjusting the pulse repetition rate of transmitted ultrasonic energy, by adjusting the scan conversion algorithm or mapping reflected ultrasonic energy, or by varying control of the drive structure for rotating the transducer. The beacons are preferably piezoelectrically active, but passive beacons may also be used. Position identification may be performed by techniques including amplitude sensing, phase sensing, pulse length sensing, and frequency sensing. As an alternative to rotation of the transducer, ultrasonic signals may be formed at a proximal end of a probe and then conducting the energy to the distal end via a waveguide.
    • 用于血管内超声成像的超声系统和方法包括固定以朝向成像换能器直接超声能量的信标阵列,其中各个信标是可识别的,以便确定成像换能器的角位置。 基于与信标识别相关的数据,自适应地调整成像装置的操作,以补偿换能器的角速度的变化。 可以通过调整扫描转换算法或映射反射的超声能量,或者通过改变用于旋转传感器的驱动结构的控制来调节发射的超声能量的脉冲重复率来执行自适应补偿。 信标优选地是压电有源的,但也可以使用被动信标。 可以通过包括幅度感测,相位感测,脉冲长度感测和频率感测的技术来执行位置识别。 作为换能器旋转的替代方案,可以在探针的近端处形成超声波信号,然后经由波导将能量传导到远端。