Abstract: A signal processing method, a signal processing apparatus, and a Coriolis flowmeter are capable of always performing measurement with constant precision and performing phase measurement with high filtering performance and a small amount of computation even when a temperature of a fluid to be measured changes, air bubbles are mixed into the fluid to be measured, or the fluid to be measured rapidly changes from a gas to a liquid. The Coriolis flowmeter detects at least one of a phase difference and a vibration frequency proportional to a Coriolis force acting on at least one flow tube or a pair of flow tubes.

Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion to combine an oscillation frequency to each of two flow rate signals obtained by A/D conversion on input signals of the phase difference and/or the vibration frequency proportional to the Coriolis force acting on the at least one flow tube; measuring a frequency of a composite waveform associated with at least one of the vibration detection sensors; transmitting a control signal based on the measured frequency; controlling so that a sum frequency component or a difference frequency component of a composite component of a composite frequency signal is constant; and measuring phases from a sum signal or a difference signal of each of controlled converted composite frequencies, to thereby obtain a phase difference signal component.

Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion to combine an oscillation frequency to each of two flow rate signals obtained by A/D conversion on input signals of the phase difference and/or the vibration frequency proportional to the Coriolis force acting on the at least one flow tube; measuring a frequency of a composite waveform associated with at least one of the vibration detection sensors; transmitting a control signal based on the measured frequency; controlling so that a sum frequency component or a difference frequency component of a composite component of a composite frequency signal is constant; and measuring phases from a sum signal or a difference signal of each of controlled converted composite frequencies, to thereby obtain a phase difference signal component.

Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion of a first digital signal, the frequency conversion performed on the first digital signal modulating the frequency of the first digital signal so that the frequency of the first digital signal after the frequency conversion is 1/Nth of the frequency of the first digital signal before the frequency conversion, where N is an integer; performing frequency conversion of a second digital signal, the frequency conversion performed on the second digital signal modulating the frequency of the second digital signal so that the frequency of the second digital signal after the frequency conversion is 1/Nth of the frequency of the second digital signal before the frequency conversion; and measuring a phase difference between (i) the frequency converted first digital signal and (ii) the frequency converted second digital signal.

Abstract: A signal processing method for a Coriolis flowmeter, the signal processing method including: measuring a frequency of a first digital signal obtained by converting a first input signal from one of a pair of vibration detection sensors into the first digital signal; transmitting a modulatable frequency signal based on the measured frequency of the first digital signal; performing frequency conversion to add or subtract the frequency of the modulatable frequency signal to or from the frequency of the first digital signal; performing frequency conversion to add or subtract the frequency of the modulatable frequency signal to or from the frequency of a second digital signal obtained by converting a second input signal from the other one of the pair of vibration detection sensors into the second digital signal; and measuring a phase difference between (i) the frequency converted first digital signal and (ii) the frequency converted second digital signal.

Abstract: Disclosed is a positive displacement gas-liquid two-phase flowmeter and a multi phase flow rate measurement system, and more specifically to a positive displacement gas-liquid two-phase flowmeter capable of measuring a flow rate of each of a gas and a liquid of a gas-liquid two-phase flow including the liquid and the gas flowing in a pipe line and a multiphase flow rate measurement system that includes the flowmeter.

Abstract: A hierarchical structure display device according to the present invention includes operation condition output means for outputting operation condition information for a switch operation condition of a first switch or a second switch to cause an operator to recognize the operation. condition information, and screen transition means for operating only when a detected switch operation of the first switch or the second switch satisfies the switch operation condition related to the operation condition information output from the operation condition output means to carry out a screen transition of a display screen. Further, the operation condition information is a display image which is displayed within the display screen and repeatedly inverted at predetermined timing during a switch operation, and a necessary number of times of inversion for the switch operation condition is displayed as the display image.

Abstract: A processing method for an operation system which performs operation processing in accordance with a detection amount detected by detection means and pulse output processing in which an operation result from the operation processing is transmitted as a pulse output, including: controlling transmission of the pulse output performed in the pulse output processing to make the transmission of the pulse output asynchronous with a timing of an end of the operation processing; and transmitting, by repeating the controlling, a pulse train having time-series continuity.

Abstract: [Object] To provide a signal processing apparatus which may always perform measurement with constant precision and performs phase measurement with high filtering performance and a small amount of computation even when a temperature of a fluid to be measured changes, air bubbles are mixed into the fluid to be measured, or the fluid to be measured rapidly changes from a gas to a liquid.

Abstract: [Object] To provide a signal processing apparatus with which, even when a temperature of a fluid to be measured changes, even when air bubbles are mixed into the fluid, to be measured, or even when the fluid to be measured rapidly changes from gas to liquid, measurement may be always performed with constant precision and phase and density measurements may be performed with a small computing amount.

Abstract: A signal processing method, a signal processing apparatus, and a Coriolis flowmeter are capable of always performing measurement with constant precision and performing phase measurement with high filtering performance and a small amount of computation even when a temperature of a fluid to be measured changes, air bubbles are mixed into the fluid to be measured, or the fluid to be measured rapidly changes from a gas to a liquid. The Coriolis flowmeter detects at least one of a phase difference and a vibration frequency proportional to a Coriolis force acting on at least one flow tube or a pair of flow tubes.

Abstract: [Summary] [Object] To provide a signal processing method, a signal processing apparatus, and a Coriolis flowmeter, which may always perform measurement with constant precision and performs phase measurement with high filtering performance and a small amount of computation even when a temperature of a fluid to be measured changes, air bubbles are mixed into the fluid to be measured, or the fluid to be measured rapidly changes from a gas to a liquid. [Solving Means] In a Coriolis flowmeter, a phase difference and/or a vibration frequency proportional to a Coriolis force acting on at least one flow tube or a pair of flow tubes are/is detected, to thereby obtain a mass flow rate and/or density of the fluid to be measured.

Abstract: [Object] To provide a signal processing apparatus which may always perform measurement with constant precision and performs phase measurement with high filtering performance and a small amount of computation even when a temperature of a fluid to be measured changes, air bubbles are mixed into the fluid to be measured, or the fluid to be measured rapidly changes from a gas to a liquid. [Solving Means] In a Coriolis flowmeter, a vibrator is operated to vibrate at least one flow tube or a pair of flow tubes (2 and 3). A phase difference and/or a vibration frequency proportional to a Coriolis force acting on the flow tubes (2 and 3) are/is detected by vibration detection sensors to obtain a mass flow rate and/or density of the fluid to be measured.

Abstract: In order to extract a part of a three-phase flow from a pipe line, a pair of communication pipes, which are connected to upstream and downstream sides of an orifice provided in the pipe line, and a gas-liquid extraction tank are used. Flowing of a slag flow or the like into the pipe line causes a periodical change in a pressure difference between input and output sides of the orifice. This causes extraction of gas-liquid and discharge mainly of gas to be simultaneously effected in the pair of communication pipes and the gas-liquid extraction tank. Within the gas-liquid extraction tank, the gas-liquid is forcibly shaken horizontally, vertically, etc. for agitating, whereby gas-liquid of high liquid-phase rate remains. Then, the gas is removed from this gas-liquid of high liquid-phase rate to thereby extract mixture liquid, which is accumulated in a liquid storage tank. The mixture liquid flows from the liquid storage tank in an amount required at a Coriolis meter.

Abstract: A first inlet portion, a second inlet portion, a first outlet portion, and a second outlet portion are fixed to a fixing member, and a connecting tube portion is provided between the first outlet portion and the second inlet portion. Further, the first inlet portion and the second inlet portion 6 are arranged in a non-parallel state such that the distance between the two increases as they depart from the fixing member. The first outlet portion and the second outlet portion are similarly arranged in a non-parallel state, the first inlet portion and the second inlet portion and the first outlet portion and the second outlet portion being arranged symmetrically. Further, the first outlet portion, the second inlet portion, and the connecting tube portion are arranged such that their three tube axes are in a straight line.

Abstract: Provided is a processing method for an operation system which performs operation processing in accordance with a detection amount detected by detection means and pulse output processing in which an operation result from the operation processing is transmitted as a pulse output, including: controlling transmission of the pulse output performed in the pulse output processing to make the transmission of the pulse output asynchronous with a timing of an end of the operation processing; and transmitting, by repeating the controlling, a pulse train having time-series continuity.

Abstract: In order to extract a part of a three-phase flow from a pipe line (23), a pair of communication pipes (13), which are connected to upstream and downstream sides of an orifice (12) provided in the pipe line (23), and a gas-liquid extraction tank (14) are used. Flowing of a slag flow or the like into the pipe line (23) causes a periodical change in a pressure difference between input and output sides of the orifice (12). This causes extraction of gas-liquid and discharge mainly of gas to be simultaneously effected in the pair of communication pipes (13) and the gas-liquid extraction tank (14). Within the gas-liquid extraction tank (14), the gas-liquid is forcibly shaken horizontally, vertically, etc. for agitating, whereby gas-liquid of high liquid-phase rate remains. Then, the gas is removed from this gas-liquid of high liquid-phase rate to thereby extract mixture liquid, which is accumulated in a liquid storage tank (17).

Abstract: A hierarchical structure display device according to the present invention (1) includes operation condition output means (11) for outputting operation condition information (10) for a switch operation condition (9) of a first switch (4) or a second switch (5) to cause an operator to recognize the operation condition information, and screen transition means (12) for operating only when a detected switch operation of the first switch (4) or the second switch (5) satisfies the switch operation condition (9) related to the operation condition information (10) output from the operation condition output means (11) to carry out a screen transition of a display screen (6). Further, the operation condition information (10) is a display image which is displayed within the display screen (6) and repeatedly inverted at predetermined timing during a switch operation, and a necessary number of times of inversion for the switch operation condition (9) is displayed as the display image.

Abstract: A flow tube composed of a bent tube having a shape symmetrical with respect to a first axis is supported at its both ends by support portions having an outlet and inlet respectively. A drive device for alternately driving the flow tube rotationally about a second axis connecting the positions where the flow tube is supported is disposed on the vertical axis of a Coriolis flowmeter. A Pair of second drive devices for alternately driving the flow tube rotationally is disposed at positions laterally symmetrical with respect to the drive device. The paired second drive devices are driven in phase; the drive device is driven with the opposite phase to those of the second drive devices. A pair of vibration detecting sensors is disposed between the drive device and one of the second drive device and between the drive device and the other respectively.