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Author

Michael Wiesinger

Bio: Michael Wiesinger is an academic researcher from AVL. The author has contributed to research in topics: Pressure regulator & Pressure sensor. The author has an hindex of 7, co-authored 22 publications receiving 170 citations.

Papers
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Patent
16 Jul 2004
TL;DR: An ultrasonic gas flowmeter includes a measuring pipe with flowing gas, transmitting and receiving sound transducers, transmission and reception electronics, and evaluation electronics as discussed by the authors, which is designed as capacitive electroacoustic ultrasonic transducers to construct a flowmeter with improved capacity.
Abstract: An ultrasonic gas flowmeter includes a measuring pipe with flowing gas, transmitting and receiving sound transducers, transmission and reception electronics, and evaluation electronics. The sound transducers (7, 8, 9, 10) are designed as capacitive electro-acoustic ultrasonic transducers to construct a flowmeter with improved capacity, especially in view of temperature stability and the reduction and consideration of a temperature profile. Devices (5, 6) are provided to level the gas temperature profile and to minimize the influence of the temperature profile on the flow measurement. A more accurate and dependable detection of the volume flow or the mass flow of gases is to be achieved, especially in highly dynamic flows, for the method of determining the flow of gases whereby the mean flow velocity is determined and the flowing gas quantity is determined with highly synchronized resolution from the two transit times of two acoustic signals. In addition, an assessed value is computed (35) for the flow after the determination of the transit times and the assessed value is corrected at least by means of a characteristic temperature of the gas and the temperature of the wall of the measuring pipe (36).

67 citations

Journal ArticleDOI
TL;DR: This paper introduces a novel Ultrasonic capacitance transducer for operation at elevated gas temperatures of several hundred degrees Celsius based on a metallic membrane foil and a backplate made of an electrically conducting substrate coated with an insulation layer.
Abstract: This paper introduces a novel Ultrasonic capacitance transducer for operation at elevated gas temperatures of several hundred degrees Celsius. The transducer design is based on a metallic membrane foil and a backplate made of an electrically conducting substrate coated with an insulation layer. Guidelines are given for selecting suitable materials for the membrane foil, the backplate substrate, and the coating. Manufacturing techniques applied for fabrication of different transducer types are described in detail. Transducers tested were composed of titanium substrates with insulation layers of silicon nitride or of silicon substrates with silicon oxide coatings. Experimental setup and test procedures are described. Results of transducer characterization and performance tests at elevated temperatures are presented and discussed. Transducer functionality is proven for air temperatures of up to 500/spl deg/C.

20 citations

Patent
18 Dec 2003
TL;DR: In this article, a method and device for continuous measuring of dynamic fluid consumption, particularly gaseous or liquid motor fuel, employs a continuously operating flow sensor with variable decrease in pressure, preferably a mass flow sensor.
Abstract: A method and device for continuous measuring of dynamic fluid consumption, particularly gaseous or liquid motor fuel, employs a continuously operating flow sensor with variable decrease in pressure, preferably a mass flow sensor. The pressure downstream from the flow sensor is adjusted to a constant value by changing the admission pressure of the sensor to make possible accurate and rapid consumption measurements with controlled output pressure for the fluid by means of an open system, and also to allow simultaneous measuring of at least a short-time return flow. The device includes a preferably controllable pump (6) possibly a conditioning device and a tank (2), and continuously operating flow sensor (7) for the fluid, preferably a Coriolis sensor, whereby a line branches off behind the sensor (7) leading to a pressure sensor whose output is connected to a control device that triggers the devices to influence the volume flow upstream from the sensor (7).

14 citations

Patent
27 Sep 2000
TL;DR: In this paper, the system is designed with a discontinuously measuring calibrating unit (2) for the mass flow sensor, arranged in series with the continuously measuring mass flow sensors (6) preferably a Coriolis-Sensor.
Abstract: The system is designed with a discontinuously measuring calibrating unit (2) for the mass flow sensor, arranged in series with the continuously measuring mass flow sensor (6) preferably a Coriolis-Sensor. During calibration, the calibrating unit (2) also determines the fuel consumption determined by the mass flow sensor and is operated as a second measuring system. Fuel is fed from supply line (1) by valve (4) controlled by computing unit (3) of the calibration unit (2) and is fed to continually measuring through flow and/or mass flow sensor (6) via changeover valve (7), also controlled by computing unit to supply load (8) with fuel. Sensor provides measurement data to computing unit. The calibration unit (2) has a calibrating tank, connected with the mass flow sensor with at least one pressure sensor arranged in the lower region of this calibrating tank.

13 citations

Patent
25 May 2006
TL;DR: In this paper, a two-way flow sensor is used to measure the consumption of gaseous or liquid fuel, where a minimum quantity of fluid is fed through a pressure regulator at any desired time whereby fluid is continuously returned in variable quantities from the region of constant exit pressure to the region between the flow sensor and the pressure regulator to make possible a continuous, accurate and timely highly defined consumption measurement with controlled exit pressure for the fluids using an open system which is able to maintain pressures in the entire line system even at highly dynamic consumption changes and which does not allow the formation of
Abstract: A method for continuous measurement of the dynamic fluid consumption of a consumer by use of a two-way flow sensor, particularly the measurement of gaseous or liquid fuel, and possibly a conditioning device, whereby the pressure is reduced to a constant exit pressure downstream from the flow sensor. A minimum quantity of fluid is fed through the pressure regulator at any desired time whereby fluid is continuously returned in variable quantities from the region of constant exit pressure to the region between the flow sensor and the pressure regulator to make possible a continuous, accurate and timely highly defined consumption measurement with controlled exit pressure for the fluids using an open system which is able to maintain pressures in the entire line system even at highly dynamic consumption changes and which does not allow the formation of a multiphase flow. The device for to carrying out the method is provided with a pressure control device downstream from the flow sensor and a connecting line with a pump leading from the region behind the pressure control device to the region between the flow sensor and the pressure control device.

10 citations


Cited by
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Patent
18 Dec 2008
TL;DR: In this paper, a method and system for operating a medical device with or without a cassette in place is described, and a method for adding additional VTBI to an ongoing infusion without stopping the infusion and with maintaining the infusion parameters.
Abstract: A method and system is disclosed for operating a medical device with or without a cassette in place. A method is disclosed for adding additional VTBI to an ongoing infusion without stopping the infusion and with maintaining the infusion parameters. A method and system is disclosed for changing the CCA without having to interrupt or completely stop an ongoing infusion. Quick titration buttons are provided to allow improved navigation between various delivery display screens.

227 citations

Journal ArticleDOI
TL;DR: The results presented in this paper demonstrate that large-area CMUTs, which produce high-intensity ultrasound, can be fabricated for transmitting directional sound with parametric arrays.
Abstract: In this study, we examine the use of capacitive micromachined ultrasonic transducers (CMUTs) with vacuum- sealed cavities for transmitting directional sound with parametric arrays. We used finite element modeling to design CMUTs with 40-mum- and 60-mum-thick membranes to have resonance frequencies of 46 kHz and 54 kHz, respectively. The wafer bonding approach used to fabricate the CMUTs provides good control over device properties and the capability to fabricate CMUTs with large diameter membranes and deep cavities. Each CMUT is 8 cm in diameter and consists of 284 circular membranes. Each membrane is 4 mm in diameter. Characterization of the fabricated CMUTs shows they have center frequencies of 46 kHz and 55 kHz and 3 dB bandwidths of 1.9 kHz and 5.3 kHz for the 40-mum- and 60-mum-thick membrane devices, respectively. With dc bias voltages of 380 V and 350 V and an ac excitation of 200 V peak-to-peak, the CMUTs generate average sound pressure levels, normalized to the device's surface, of 135 dB and 129 dB (re 20 muPa), respectively. When used to generate 5 kHz sound with a parametric array, we measured sound at 3 m with a 6 dB beamwidth of 8.7deg and a sound pressure level of 58 dB. To understand how detector nonlinearity (e.g., the nonlinearity of the microphone used to make the sound level measurements) affects the measured sound pressure level, we made measurements with and without an acoustic low-pass filter placed in front of the microphone; the measured sound levels agree with numerical simulations of the pressure field. The results presented in this paper demonstrate that large-area CMUTs, which produce high-intensity ultrasound, can be fabricated for transmitting directional sound with parametric arrays.

127 citations

Patent
17 Aug 2012
TL;DR: In this article, the authors describe systems and methods for a graphical interface including a graphical representation of medical data and provide medical safety reporting capabilities including reporting of history data and real-time visual monitoring data.
Abstract: This disclosure describes systems and methods for a graphical interface including a graphical representation of medical data The graphical interface platform may receive medical data and provide medical safety reporting capabilities including reporting of history data and real-time visual monitoring data The graphical interface platform may be configured to identify potential problems and corrections to medical devices in operation while a reporting cycle is underway through visual representation of performance metrics

60 citations

Journal ArticleDOI
TL;DR: A method for analyzing capacitive micromachined ultrasonic transducer arrays and arrays of elements composed of several CMUTs is proposed, based on a combination of a free acoustic mode description of an isolated CMUT, and the coupling of these modes to the fluid in which waves should be excited or detected through an impedance matrix that will depend on frequency.
Abstract: A method for analyzing capacitive micromachined ultrasonic transducer (CMUT) arrays and arrays of elements composed of several CMUTs is proposed. It is based on a combination of a free acoustic mode description of an isolated CMUT, and the coupling of these modes to the fluid in which waves should be excited or detected through an impedance matrix that will depend on frequency. The parameters of the model describing the isolated CMUT is independent of frequency and excitation of neighbor CMUTs, whereas the acoustic impedance matrix describing the coupling to the fluid will depend on both the excitation of neighbor CMUTs and frequency. Hence, this splitting of the calculations has a potential for saving computer time. The analysis gives transfer functions from excitations that vary harmonically with time and space along the array surface to CMUT parameters as current, mode excitations, or output acoustic pressure. Based on this, the response of essentially arbitrary excitations of the CMUTs may be obtained. The method is used to analyze an infinitely large array of circular CMUTs on a rectangular grid. The CMUTs are assumed to be operating in collapsed mode. Sharp resonances are shown to occur that could be significantly damped by adding series resistors to the CMUTs or increasing the water viscosity.

51 citations

Patent
22 Dec 2004
TL;DR: In this article, a method of determining a fluid inflow profile along the length of a permeable inflow region of an underground wellbore is proposed, where the heater cable may have a layer of compacted mineral powder and temperatures may be measured with an optical fiber.
Abstract: A method of determining a fluid inflow profile along the length of a permeable inflow region of an underground wellbore comprising: transferring heat into or from the permeable inflow region of the wellbore during a well shut period; starting production of hydrocarbon fluids via the permeable inflow region; measuring substantially simultaneously the temperature of the fluids at various points of the inflow region; determining at selected intervals of time after production start up a temperature profile of the inflow region on the basis of the thus measured temperatures; and determining a fluid inflow profile of the inflow region on the basis of a comparison of the determined temperature profiles at selected intervals after production start up. The heater cable may have a layer of compacted mineral powder and temperatures may be measured with an optical fiber.

49 citations