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    • 6. 发明公开
    • SYSTEM AND METHOD FOR NON-INTRUSIVE AND CONTINUOUS LEVEL MEASUREMENT OF A LIQUID SPECIFICATION
    • 系统及方法液体规格的非侵入性,连续物位测量
    • EP3115753A1
    • 2017-01-11
    • EP15195777.6
    • 2015-11-23
    • ABB Schweiz AG
    • Kassubek, FrankLenner, MiklosKaufmann, TobiasPape, Detlef
    • G01F23/296G01S7/52G01S7/539G01S15/32G01S15/88
    • G01F23/2962G01B17/00G01H5/00G01N29/024G01N29/041G01N29/222G01N2291/011G01N2291/02836G01N2291/02854G01N2291/0427G01N2291/102G01S7/52004G01S7/536G01S7/539G01S15/003G01S15/32G01S15/88
    • A system and a method for non-intrusive and continuous level measurement of a liquid are described, where the liquid is enclosed by a solid wall of a vessel (41). The system comprises an ultrasonic transmitter (48) for generating an ultrasound wave and for emitting it into the vessel wall, an ultrasonic receiver (49) for receiving the ultrasound wave through the vessel wall, and at least one electronic control and data processing unit (6) for controlling operation of the transmitter (48) and of the receiver (49) and for determining the liquid level (H) from a time of flight of the ultrasound wave. The transmitter (48) is a frequency-tunable transmitter which is placed at a first position at the outside of the vessel wall and below the level of the liquid surface (44) in such a way that the transmitter (48) is able to emit the ultrasound wave as a primary Lamb wave into the vessel wall so that a part of the primary Lamb wave leaks from the vessel wall into the liquid in form of a pressure wave (43) in an inclined and upward direction towards the liquid surface (44). The receiver (49) is placed at a second position at the outside of the vessel wall and below the level of the liquid surface (44) in such a way that the receiver (49) is able to receive a secondary Lamb wave which is generated by the pressure wave (43, 45) hitting the vessel wall after having been reflected by the liquid surface (44). The at least one electronic control and data processing unit (6) is adapted to repeatedly determine the time of flight (t) of the pressure wave (43, 45), change the ultrasonic frequency (f) of the transmitter (48) until the determined time of flight reaches a minimum (tmin), and determine the liquid level (H) based on the relationship that the minimum time of flight (tmin) equals the length of the travel path of the pressure wave (43, 45) divided by the speed of the pressure wave in the liquid (cL).
    • 的系统和用于液体的非侵入式和连续电平测量的方法被描述,其中,所述液体由容器(41)的实心壁包围。 该系统包括(对于在超声波产生和发射它到血管壁中以超声接收器(49),用于通过血管壁接收超声波的超声波发射器(48),和至少一个电子控制和数据处理单元 6),用于控制操作的发射器(48)和接收器(49)和用于从所述超声波的飞行时间确定性采矿液位(H)。 发射机(48)是一个频率可调发射机所有这一切都在第一位置在寻求一种方式并发送器(48)放置在血管壁的外部和下面的液体表面(44)的电平是能够发射 超声波作为主兰姆波到血管壁中,从而没有从所述血管壁的主要Lamb波泄漏的一部分成在倾斜和向上的方向朝向液体表面的压力波(43)的形式,所述液体(44 )。 所述接收器(49)在第二位置在寻求一种方式做了接收器(49)放置在血管壁的外部和下面的液体表面(44)的电平是能够接收次级兰姆波所有其中产生 由压力波(43,45)撞击由所述液体表面(44)反射之后的血管壁。 该至少一个电子控制和数据处理单元(6)是angepasst反复确定性矿的压力波(43,45)的飞行(t)中的时间,改变超声波频率(f)的发射机(48),直到的 的飞行确定性开采时间到达基于该关系的最小(T min),以及确定性矿液面(H)那样的飞行(T min),将最小时间等于压力波的行进路径的长度(43,45)除以 在液体(CL)中的压力波的速度。