Patent•
Ultrasonic gas flowmeter as well as device to measure exhaust flows of internal combustion engines and method to determine flow of gases
AVL1
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).
Citations
More filters
Patent•
18 Dec 2008TL;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
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
Patent•
22 Dec 2004TL;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
Patent•
16 Jun 2015
TL;DR: In this article, a system and method for monitoring and delivering medication to a patient is described, which includes a controller that has a control algorithm and a closed loop control that monitors the control algorithm.
Abstract: A system and method for monitoring and delivering medication to a patient. The system includes a controller that has a control algorithm and a closed loop control that monitors the control algorithm. A sensor is in communication with the controller and monitors a medical condition. A rule based application in the controller receives data from the sensor and the closed loop control and compares the data to predetermined medical information to determine the risk of automation of therapy to the patient. A system monitor is also in communication with the controller to monitor system, remote system, and network activity and conditions. The controller then provides a predetermined risk threshold where below the predetermined risk threshold automated closed loop medication therapy is provided. If the predetermined risk threshold is met or exceeded, automated therapy adjustments may not occur and user/clinician intervention is requested.
40 citations
Patent•
21 Jul 2006
TL;DR: In this paper, the authors present a method for determining transducer delay time and transduce separation in ultrasonic flow meters, which is based on measuring a delay time for a first transducers pair, measuring a total measured time for ultrasonic signals transmitted between a second transducers in an ultrasonic meter in which both the first and second transducers are installed.
Abstract: Methods and related systems for determining transducer delay time and transducer separation in ultrasonic flow meters At least some of the illustrative embodiments are a method comprising measuring a delay time for a first transducer pair, measuring a total measured time for ultrasonic signals transmitted between a second transducer pair in an ultrasonic meter in which both the first and second transducer pairs are installed, calculating a parameter associated with the second transducer pair using the delay time of the first transducer pair and the total measured time for said second transducer pair
39 citations
References
More filters
Patent•
08 Aug 2003TL;DR: In this article, the authors described a micromachined ultrasonic transducers (MUTS) and a method of fabrication, where the membranes of the transducers are fusion bonded to cavities to form cells.
Abstract: There is described a micromachined ultrasonic transducers (MUTS) and a method of fabrication. The membranes of the transducers are fusion bonded to cavities to form cells. The membranes are formed on a wafer (11) of sacrificial material. This permits handling for fusions bonding. The sacrificial material is then removed to leave the membrane (14). Membranes of silicon, silicon nitride, etc. can be formed on the sacrificial material. Also described are cMUTs, pMUTs and mMUTs.
151 citations
TL;DR: In this paper, the authors present fluidic devices and systems which have micromachined ultrasonic transducers integrated into microchannels, which can be disposed and operated to measure fluid characteristics such as pressure, density, viscosity, flow rate and can also be used to mix and pump fluids.
Abstract: The present invention provides fluidic devices and systems which have micromachined ultrasonic transducers integrated into microchannels. The ultrasonic transducers generate and receive ultrasonic waves. The transducers can be disposed and operated to measure fluid characteristics such as pressure, density, viscosity, flow rate and can also be used to mix and pump fluids.
74 citations
Patent•
06 Jul 1999
TL;DR: In this article, a method for measuring the displacement of a fluid in a conduit, by measuring the transit time of ultrasounds between two transducers (12, 13), in one direction and in the other, was proposed.
Abstract: The invention concerns a method for measuring the displacement of a fluid in a conduit, by measuring the transit time of ultrasounds between two transducers (12, 13), in one direction and in the other, characterised in that it consists in: simultaneously exciting (16) both transducers; then simultaneously measuring (17, 18) the signals received on each of the transducers coming from the other transducer. The measured signals can then be digitised and correlated to determine the difference between the transit times. The invention enables to obtain faster and more reliable measurement of transit times between transducers.
1 citations