Detlef Pape

Bio: Detlef Pape is an academic researcher from Brown, Boveri & Cie. The author has contributed to research in topics: Lamb waves & Ultrasonic sensor. The author has an hindex of 5, co-authored 11 publications receiving 297 citations.

System and method for non-intrusive and continuous level measurement of a liquid

Abstract: A system and a method for non-intrusive and continuous level measurement of a liquid enclosed by a solid wall of a vessel. The system comprises an ultrasonic transmitter for generating an ultrasound wave and for emitting it into the vessel wall, an ultrasonic receiver for receiving the ultrasound wave, and an electronic control and data processing unit (ECDU) for controlling operation of the transmitter and of the receiver and for determining the liquid level. The transmitter is able to emit the ultrasound wave as a primary Lamb wave into the vessel wall so that a part of the primary Lamb wave leaks from the vessel wall into the liquid in form of a pressure wave. The ECDU is adapted to repeatedly determine the time of flight of the pressure wave, change the ultrasonic frequency of the transmitter until the determined time of flight reaches a minimum, and determine the liquid level.

Temperature sensor having means for in-situ calibration

Abstract: A temperature sensor is disclosed as having a resistance thermocouple, accommodated in a sensor housing, for detecting a process temperature. The thermocouple can be connected via a multipole electric line to an electronic temperature transmitter for measured-value conditioning, the resistance thermocouple being equipped for in-situ calibration with a Johnson noise thermometer for determination of a reference temperature.

System and method for measuring a signal propagation speed in a liquid or gaseous medium

Abstract: A system and a method for measuring a signal propagation speed in a liquid contained in a vessel or in a gaseous medium contained in the same vessel above the surface of the liquid are proposed. A transmitter transmits a first signal in a first direction which is at an acute or right angle to a first reflective surface, wherein the first reflective surface reflects the first signal so that it travels in a second direction is received by a first acoustic or electromagnetic receiver. The transmitter transmits a second signal in a predetermined third direction which is at an acute angle to the first direction, where the first or a second reflective surface reflects the second signal so that it travels in a predetermined and angular fourth direction with respect to the first or second reflective surface and is received by the first or a second acoustic or electromagnetic receiver. The speed of sound is then determined under the assumption that both the first and the second signals travel at the same average speed.

System and method for non-intrusive and continuous level measurement of a liquid specification

Abstract: A system and a method for non-intrusive and continuous level measurement of a liquid are described, where the liquid is enclosed by a solid wall of a vessel (41). The system comprises an ultrasonic transmitter (48) for generating an ultrasound wave and for emitting it into the vessel wall, an ultrasonic receiver (49) for receiving the ultrasound wave through the vessel wall, and at least one electronic control and data processing unit (6) for controlling operation of the transmitter (48) and of the receiver (49) and for determining the liquid level (H) from a time of flight of the ultrasound wave. The transmitter (48) is a frequency-tunable transmitter which is placed at a first position at the outside of the vessel wall and below the level of the liquid surface (44) in such a way that the transmitter (48) is able to emit the ultrasound wave as a primary Lamb wave into the vessel wall so that a part of the primary Lamb wave leaks from the vessel wall into the liquid in form of a pressure wave (43) in an inclined and upward direction towards the liquid surface (44). The receiver (49) is placed at a second position at the outside of the vessel wall and below the level of the liquid surface (44) in such a way that the receiver (49) is able to receive a secondary Lamb wave which is generated by the pressure wave (43, 45) hitting the vessel wall after having been reflected by the liquid surface (44). The at least one electronic control and data processing unit (6) is adapted to repeatedly determine the time of flight (t) of the pressure wave (43, 45), change the ultrasonic frequency (f) of the transmitter (48) until the determined time of flight reaches a minimum (tmin), and determine the liquid level (H) based on the relationship that the minimum time of flight (tmin) equals the length of the travel path of the pressure wave (43, 45) divided by the speed of the pressure wave in the liquid (cL).

A Megatrend Challenging Analytical Chemistry: Biosensor and Chemosensor Concepts Ready for the Internet of Things.

Abstract: The Internet of Things (IoT) is a megatrend that cuts across all scientific and engineering disciplines and establishes an integrating technical evolution to improve production efficiencies and daily human life. Linked machines and sensors use decision-making routines to work toward a common product or solution. Expanding this technical revolution into the value chain of complex areas such as agriculture, food production, and healthcare requires the implementation and connection of sophisticated (bio)analytical methods. Today, wearable sensors, monitors, and point-of-care diagnostic tests are part of our daily lives and improve patients' medical progression or athletes' monitoring capabilities that are already beyond imagination. Also, early contributions toward sensor networks and finally the IT revolution with wireless data collection and transmission via Bluetooth or smartphones have set the foundation to connect remote sensors and distributed analytical chemical services with centralized laboratories, cloud storage, and cloud computing. Here, we critically review those biosensor and chemosensor technologies and concepts used in an IoT setting or considered IoT-ready that were published in the period 2013-2018, while also pointing to those foundational concepts and ideas that arose over the last two decades. We focus on these sensors due to their unique ability to be remotely stationed and that easily function in networks and have made the greatest progress toward IoT integration. Finally, we highlight requirements and existing and future challenges and provide possible solutions important toward the vision of a seamless integration into a global analytical concept, which includes many more analytical techniques than sensors and includes foremost next-generation sequencing and separation principles coupled with MS detection.