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1. 发明专利

JP2002296085A ULTRASONIC FLOWMETER 失效
公开(公告)号：JP2002296085A
公开(公告)日：2002-10-09
申请号：JP2001103757
申请日：2001-04-02
申请人： TOKYO KEISO KK , TECHNO DATA KK
发明人： KOBAYASHI TAMOTSU , SHIGETA KUNIKAZU , FUJII TORU
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter capable of controlling properly the gain of an amplifier regardless of the quantity of impurities such as air bubbles or the like included in a fluid, executing flow measurement with a high S/N ratio even to the change of the kind or the temperature of the fluid, and executing stably always accurate flow measurement. SOLUTION: This flowmeter is constituted so that waveform data including at least a peak value in a received signal are digitally converted by an analog- digital converter 9 and preserved in a memory 11, and that a processor 10 selects the peak value in the case where the impurities such as the air bubbles, the solid powder or the like are not included in the fluid, as a selected peak value from among the peak values preserved in the memory at each prescribed time interval, compares the selected peak value with a peak set value set beforehand in the processor, transmits a control signal to a gain control terminal of the amplifier 5 based on the comparison result, and controls so that the peak value in an output signal of the amplifier becomes roughly in the same degree as the peak set value.

2. 发明专利

JP2002162269A ULTRASONIC FLOWMETER BY PROPAGATION TIME DIFFERENCE SYSTEM 失效
公开(公告)号：JP2002162269A
公开(公告)日：2002-06-07
申请号：JP2000359495
申请日：2000-11-27
申请人： TOKYO KEISO KK , TECHNO DATA KK
发明人： KOBAYASHI TAMOTSU , SHIGETA KUNIKAZU , FUJII TORU
IPC分类号： G01F1/66 , G01F1/74
摘要： PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter by a propagation time difference system capable of obtaining stable measuring values even in the case that it hardly receives the influence of electric pulse noise from the outside, impurities such as bubbles in liquid and solid powder are contained and a receiving signal is attenuated. SOLUTION: An analog-digital converter converts the amplification waveform of the receiving signal amplified by an amplifier into a plurality of voltage value-time vs data. A digital signal processor selects object peaks P1, P2 taking the maximum value on the basis of time data and voltage value data in the waveform of the voltage value-time vs data, the object peak or at least one zero cross point q1, q2, q3 continuing to the front and rear of the peak adjacent to the object peak is estimated by calculation from the plurality of the voltage value-time vs data distributed before and after the time of the zero cross point, the propagation time of one zero cross point or the average propagation time of the plurality of the zero cross points are found to output a flow rate signal.

3. 发明专利

JP2003139592A ULTRASONIC FLOWMETER BY PROPAGATION TIME DIFFERENCE METHOD 审中-公开
公开(公告)号：JP2003139592A
公开(公告)日：2003-05-14
申请号：JP2001335162
申请日：2001-10-31
申请人： TOKYO KEISO KK , TECHNO DATA KK
发明人： FUJII TORU , KOBAYASHI TAMOTSU , SHIGETA KUNIKAZU
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter capable of obtaining sufficiently high resolution, and of executing stable high-precision measurement regardless of fluctuation of the sampling phase of an analog-digital converter, and having excellent measurement accuracy. SOLUTION: This ultrasonic flowmeter is provided with a pair of ultrasonic oscillators 2a and 2b mounted on the upstream side and the downstream side in the fluid flow direction of a pipe body 1 for a passage; a switch 3 for alternately switching their transmission and reception; an amplifier 5 for amplifying a received signal; and a data processor 9 for measuring the zero-cross point of the amplified received signal to obtain propagation times for the upstream side and for the downstream side and thereby calculating a flow signal from the propagation times. The data processor is so constituted that the amplified waveforms of the received signal is converted into a plurality of coupled data of voltage values-times, at least one zero-cross point is selected from the plural zero-cross points where the amplified waveform intersects with the time axis, two approximate expressions of an equal order or an approximate expression of third order or above are obtained from a plurality of coupled data distributed in a time before and after the zero-cross point, and a time approximate value of the zero-cross point is obtained form the time axis intercept of the approximate expression to calculate a propagation time from the transmission to the reception of the ultrasonic waves.

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