Oval Corporation

Kabushiki Kaisha Toshiba

Hideki Shimada

Hirokazu Kitami

Kazuo Suzuki

Yukishige Maezawa

Masahiro Tadauchi

Terunobu Hayata

Fuminobu Tezuka

Jiro Kano

Isao Ito

Takeshi Gotanda

Masao Koyama

Akinori Hongu

Kazuhito Haruki

Shunji Saitoh

Kazuhiko Nishimura

Satoshi Kanazawa

Miho Takahashi

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.

Signal processing method, signal processing apparatus, and Coriolis flowmeter

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.

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.

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.

Signal processing method, signal processing apparatus, and coriolis flowmeter

A drive device for operating an electromagnetic oscillator includes an OP amplifier for amplifying an analog input signal from an electromagnetic pick-off and an A/D converter for converting an analog signal output from the OP amplifier into a digital signal. The drive device also includes a D/A converter for converting, after digital processing performed by a DSP on the digital signal output from the A/D converter based on phase detection, a digital signal having a processed data amount into an analog signal, and a D/A converter for converting, after the digital processing performed by the DSP on the digital signal output from the D/A converter based on the phase detection, a digital signal having a processed data amount into an analog signal.

Coriolis flowmeter

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.

Processing method in operation system, flow rate converter, and coriolis flow meter

A value of a line-to-line resistor () is determined by subtracting a resistance value determined as a product of a voltage ratio based on divided voltages and a value of a reference resistor in a non-conductive state between a second electric wire () and a third electric wire () from a resistance value determined as a product of a voltage ratio based on the divided voltages and the value of the reference resistor in a conductive state therebetween. Once the value of the line-to-line resistor () is determined, it becomes possible to determine a compensated resistance value related to temperature.

Temperature measuring circuit in a flowmeter

Supplier-specific data of material items are extracted from data of various material items used for the manufacture of a product. Tabular data having a structure that allows various pieces of environment consideration condition information about the extracted data to be input is created by using general-purpose spreadsheet software. The tabular data is laid out to locate an item whose contents are likely to change at an end of a table so as to minimize a change in data structure in the event of a change in contents of environment consideration condition items. The tabular data is provided to the supplier. Environment consideration condition information about each material item is acquired by using the tabular data containing the environment consideration condition information added to the tabular data on the supplier side.

Method of acquiring environment consideration condition information

Disclosed is a method and apparatus for pyrolytically decomposing waste plastic which may contain halogen-containing polymer such as PVC. The plastic is heated at 270&deg; to 350&deg; C., whereby a plasticizer contained in the plastic material is decomposed and vaporized, and a chlorine-containing polymer is dechlorinated to produce hydrogen chloride. The vaporized decomposition matter and the hydrogen chloride are removed from the plastic, and the vaporized decomposition matter is separated from the hydrogen chloride. Then isolated plastic is further heated to 450&deg; C. or higher to produce a pyrolysis product. Alternatively, the former heating step is divided into two steps of: heating at a temperature lower than 270&deg; C., whereby a plasticizer is decomposed; and heating to 270&deg; to 350&deg; C., whereby a chlorine-containing polymer contained in the plastic material is dechlorinated. Accordingly, the decomposition matter of plasticizer and hydrogen chloride are separately removed from the plastic.

Method and apparatus for pyrolytically decomposing waste plastic

Disclosed is a method and an apparatus for pyrolytically decomposing waste plastic, e.g. PVC, to recover light fuel oil. The invention enables to prevent the product from contamination by halogen compounds. The plastic is first thermally decomposed in an atmosphere of a normal or reduced pressure to produce a primary decomposition product in the form of gas and a decomposition residue. The primary decomposition product is cooled at a first cooling temperature to separate the primary decomposition product into a relatively light fraction containing a desired light constituent and a relatively heavy fraction by condensation of the relatively heavy fraction, and the relatively heavy fraction is then thermally decomposed in an atmosphere pressurized at a predetermined pressure to produce a secondary decomposition product containing the desired light constituent in the form of gas. The relatively light fraction and the secondary decomposition product are cooled at a second cooling temperature to condense a fraction containing the desired light constituent. This method may be changed so that the first and second thermal decomposition steps are performed at the same high pressure in one vessel and the heavy fraction is circulated. Additionally, alkali treatment of time plastic to be decomposed or the decomposition gas, thermal pretreatment of the plastic and addition of water or catalyst to the plastic can be used. The decomposition apparatus which is so systematized that the decomposition can be continuously performed is shown.

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Tokyo, Japan

Hideki Shimada