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公开(公告)号：EP0145384A3
公开(公告)日：1986-02-26
申请号：EP84308135
申请日：1984-11-23
CPC分类号： G01F1/667 , A61M16/08 , A61M16/085 , A61M2230/432
摘要： A measuring conduit adapted for flow rate and concentration of a fluid for use in a measuring apparatus which measures both the flow rate of the fluid such as a respiratory gas containing a particular gas component, for example, carbon dioxide, using an ultrasonic wave and the concentration of the particular gas component in an optical manner. In order to simultaneously measure the flow rate and concentration and also to reduce the dead space of the measuring conduit, this measuring conduit comprises a single conduit member (2) through which the fluid flows: a pair of ultrasonic transducers (4a, 4b) attached to the conduit member so as to face each other along a line slanted with respect to a flow direction of the fluid; and a pair of light transmitting windows (5a, 5b) airtightly provided in the wall of the conduit member between the ultrasonic transducers so as to face each other. One (5a) of the light transmitting windows introduces a light beam from an external light source (8) into the conduit member (2). The other light transmitting window (5b) introduces the light penetrating the fluid flowing through the conduit member into a photo detecting element (13) of the measuring apparatus.
摘要翻译： 一种测量管道，其适用于用于测量装置的流体的流速和浓度，该测量装置使用超声波测量诸如包含特定气体成分的呼吸气体（例如二氧化碳）的流体的流量， 特定气体组分以光学方式浓缩。 为了同时测量流量和浓度以及减少测量导管的死空间，该测量导管包括流体流过的单个导管构件; 一对超声换能器，其沿着相对于流体的流动方向倾斜的线相对于所述导管构件相互面对; 以及在超声波换能器之间气密地设置在导管构件的壁中的一对透光窗，以便彼此面对。 一个透光窗将来自外部光源的光束引入导管构件。 另一个透光窗口将穿过导管构件的流体的光引入测量装置的光检测元件。
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公开(公告)号：EP0078381A3
公开(公告)日：1984-12-27
申请号：EP82108339
申请日：1982-09-09
发明人： Mount, Bruce E. , Rader. Con D.
摘要： A transducer assembly comprising an inner, primary, transducer having a pair of transducers fixed to a liner or cavity for providing the fluid compression sending and receiving signals for measuring the velocity and change of composition of fluid in the cavity which is being inspired and expired by a patient in a setting, such as in an intensive care unit of a hospital. The inner transducer is disposed in a heated housing to maintain the temperature of the inner transducer at a temperature above the saturation point of the fluid being measured and is further provided with (1) an acoustical absorber to prevent sound energy from the connection tubes, which connect the transducer assembly to endotracheal tubing, from adversely affecting fluid measurements and, (2) water absorbing material to prevent I water, which might condense in the connecting tubing, from entering the inner transducer and affecting the fluid measurements. I
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公开(公告)号：EP0087552A3
公开(公告)日：1985-07-17
申请号：EP83100079
申请日：1983-01-07
申请人： Doltron AG
发明人： Rechsteiner, Alfred
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公开(公告)号：EP0031102A3
公开(公告)日：1983-06-22
申请号：EP80107865
申请日：1980-12-12
申请人： EBARA CORPORATION
发明人： Yasuda, Yoshichiro , Satoh, Seio
摘要： An inexpensive flow meter with a special arrangement of a minimum of transducers always provides an accurate measure of flow of the fluid in a conduit irrespective of the condition of the fluid. Mode control switching circuitry including fluid condition detecting means selectively energizes one or two transmitters in the transducers each of which then feeds a beam of ultrasonic waves to the fluid. Receiver means in the transducers selectively receives both the transmission (transit) mode waves and the reflection (Doppler-shifted) mode waves in accordance with the current condition of the fluid. In one embodiment, the beam of ultrasonic waves uses a single path of travel extending from a transmitter and a receiver while in another embodiment, it uses dual parallel paths extending from two transducers and two receivers.
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公开(公告)号：EP0056137A3
公开(公告)日：1983-03-16
申请号：EP81110556
申请日：1981-12-17
发明人： Loveland, Robert S.
IPC分类号： G01F01/66
CPC分类号： G01F1/667
摘要： A flowmeter system and method comprising means defining a path for the flow of a fluid medium therethrough, first and second spaced apart transducers disposed along said flow path for generating acoustic compression waves (energy) in the flow medium between the transducers with increased transmission times and occurring immediately following the cessation of transmission of the other transducer, and means for measuring the phase difference in the received acoustic compression waves relative to that transmitted and for producing sum and difference voltage signals dependent upon the sum and differences of the two measured phase differences the length of time for the generation of energy in the fluid being long enough to allow the energy to equilibrate and to allow more time after initiation of transmission before measurement of the phase difference and the purpose of having the second transmitter generate energy immediately following the cessation of the generation of the prior transducer is to swamp out the energy generated by the prior transmission. The system is a phase lock loop transmitter receiver system and also includes means for automatically adjusting the frequency of the acoustic compression waves so that a constant compression wave length is maintained and for producing signals indicative of the direction and magnitude of the flow of the medium in the flow path as well as changes in composition of the medium.
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公开(公告)号：EP0179541A3
公开(公告)日：1987-08-26
申请号：EP85302198
申请日：1985-03-29
申请人： SMITH METER INC.
IPC分类号： G01F01/66
CPC分类号： G01F1/667
摘要： The disclosed meters employ mechanical radiant energy to determine the flow velocity of flowing material. Mechanical radiant energy is propagated through the flowing material in two directions to permit the material to cause a variance between the average velocity at which the energy travels in a first direction from the average velocity at which the energy travels in a second direction. Since the variance in average velocities is due to the movement of the material and is related thereto, the variance, and the difference in time required for the energy to propagate through the material, can be used to determine the flow velocity of the material. One embodiment employs the following equation to calculate the flow velocity: where t. and t, represent the time required for the energy to traverse the path in each direction. Another embodiment transmits energy pulses in each direction in groups of at least two pulses and imposes a time delay between the time each pulse finishes propagating along the path and the transmission of the next pulse. The time required for the energy to propagate along the path In each direction is determined from the time required to transmit along the path all the energy pulses of each group and the total duration of the time delays. A further embodiment examines the received energy and determines whether the level of the transmitted energy should be altered to improve signal processing. A further embodiment assumes that the energy has reached the end of the path, and is therefore able to determine the time required for the pulse to traverse the path, by defining a receive point which is a predetermined point at which the received signal crosses a reference axis following the peak level of the signal. The preferred embodiment combines all the features identified above.
摘要翻译： 所公开的仪表采用机械辐射能来确定流动材料的流速。 机械辐射能量在两个方向上传播通过流动材料，以允许材料在能量沿第一方向行进的平均速度与能量在第二方向上行进的平均速度之间引起变化。 由于平均速度的变化是由于材料的移动和与之相关的，因此能量通过材料传播所需的方差和时间差可用于确定材料的流速。 一个实施例采用以下等式计算流速：
其中tu和td表示能量在每个方向上穿过路径所需的时间。 另一个实施例在至少两个脉冲的组中在每个方向上传输能量脉冲，并且在每个脉冲完成沿着路径传播的时间与下一个脉冲的传输之间施加时间延迟。 能量沿着每个方向的路径传播所需的时间是从沿着路径传送每组的所有能量脉冲和时间延迟的总持续时间所需的时间确定的。 另一实施例检查所接收的能量并确定是否应改变发射能量的电平以改善信号处理。 另一个实施例假设能量已经到达路径的末端，并且因此能够通过定义接收点来确定脉冲穿过路径所需的时间，接收点是接收信号穿过参考点的预定点 轴跟随信号的峰值电平。 优选实施例组合了上述所有特征。 -
公开(公告)号：EP0048791A3
公开(公告)日：1983-06-15
申请号：EP81103834
申请日：1981-05-19
发明人： Meisser, Claudio , Lechner, Hubert
IPC分类号： G01F01/66
CPC分类号： G01F1/662
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8.发明公开
公开(公告)号：EP0056136A3
公开(公告)日：1983-03-16
申请号：EP81110555
申请日：1981-12-17
发明人： Loveland, Robert S.
IPC分类号： G01F01/66
CPC分类号： G01F1/667
摘要： A flowmeter system for measuring the flow and changes in the velocity of sound due to changes in composition or temperature of a fluid medium in a flow tube including transducers which generate acoustic compression waves in the fluid medium, phase lock loop transmitter/receiver circuitry including means for measuring the difference in phase of the acoustic compression waves transmitted upstream relative to that received and for measuring the phase difference of the acoustic compression waves transmitted downstream relative to that received and producing a sum signal dependent upon the sum of the two measured phase differences, means for producing a difference signal proportional ot the difference of the two measured phase differences which provides an output signal representing the direction and magnitude of the measured flow means for automatically adjusting the frequency of the acoustic compression waves so that their wave lengths remains constant, said means for automatically adjusting the frequency including a voltage controlled oscillator whose output frequency changes with a change in the sum signal, and synchronous clock means coupled to the output of the voltage controlled oscillator for providing a time base for the entire circuit which is synchronized with the output frequency of the voltage controlled oscillator.
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公开(公告)号：EP0056135A3
公开(公告)日：1983-03-16
申请号：EP81110554
申请日：1981-12-17
发明人： Loveland, Robert S.
IPC分类号： G01F01/66
CPC分类号： G01F1/667
摘要： A flowmeter system having means defining a path for confining the flow of a fiuid medium therethrough, first and second transducers disposed along said flow path for generating and receiving acoustic compression waves in the fluid medium between the transducers, a phase lock loop transmitter/receiver system including a voltage controlled oscillator for adjusting the frequency of the acoustic compression waves to maintain the compression wave length constant, means for measuring the phase difference of the received acoustic compression waves relative to that transmitted and means for producing a sum signal proportional to the sum of the two measured phase differences to vary the output of said voltage controlled oscillator, and means for producing a difference signal proportional to the difference of the two measured phase differences which provides an output signal representing the direction and magnitude of the measured flow, said means for measuring the phase sum and difference comprising a phase detector of the edge triggered type comprising a set/resetflipflop which is physically separated from the voltage controlled oscillator. The system also includes means for generating signals representing changes in velocity of sound in the fluid medium.
摘要翻译： 一种流量计系统，具有限定用于限制流体介质流动的路径的装置，沿着所述流动路径设置的第一和第二换能器，用于在换能器之间的流体介质中产生和接收声压缩波;锁相环发射器/接收器系统 包括用于调节声压缩波的频率以保持压缩波长恒定的压控振荡器，用于测量接收到的声压缩相对于传输的压缩波的相位差的装置，以及用于产生与 两个测量的相位差以改变所述压控振荡器的输出，以及用于产生与两个测量的相位差的差成比例的差分信号的装置，其提供表示测量流的方向和幅度的输出信号，所述装置 测量相位和差分比较 是边缘触发型的相位检测器，其包括与压控振荡器物理分离的置位/复位触发器。 该系统还包括用于产生表示流体介质中的声速变化的信号的装置。
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10.发明公开
公开(公告)号：EP0198731A3
公开(公告)日：1987-01-07
申请号：EP86400456
申请日：1986-03-05
申请人： FRAMATOME
CPC分类号： G10K11/24 , G01F1/662 , G01N2291/02836 , G01N2291/02872
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