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Martinson, Emil
Publications (5 of 5) Show all publications
Martinson, E. & Delsing, J. (2010). Electric spark discharge as an ultrasonic generator in flow measurement situations (ed.). Flow Measurement and Instrumentation, 21(3), 394-401
Open this publication in new window or tab >>Electric spark discharge as an ultrasonic generator in flow measurement situations
2010 (English)In: Flow Measurement and Instrumentation, ISSN 0955-5986, E-ISSN 1873-6998, Vol. 21, no 3, p. 394-401Article in journal (Refereed) Published
Abstract [en]

In this paper, a gap discharge approach to create acoustic signals for ultrasonic low pressure gas flow measurements is investigated. The objective is to develop an ultrasonic gas flow meter system that is capable of operation in extreme industrial environments. These environments might have extremely high temperatures (1200 °C), moisture, steam, dust, low gas pressure and large transmission distances.

Most other types of ultrasonic transducers found show sensitivity to such conditions: their operation suffers, or they may even stop functioning if exposed to such environments. The development of new transducer technology is therefore crucial to allow ultrasonic flow measurements in extreme industrial environments. In this paper, the gap discharge emitter is evaluated as a candidate to be used in these applications. Its capabilities as a sound source are investigated, and its impact on flow meter performance is estimated. It can be concluded that, despite the uncertainties it introduces to a flow meter system, it stands out as a strong candidate to be used as an acoustic emitter in a gas flow meter system for extreme environments.

Keywords
Ultrasound flow meter, Robust transducer, Extreme environments, Gap discharge
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-12620 (URN)10.1016/j.flowmeasinst.2010.04.011 (DOI)000282083100032 ()2-s2.0-77955842210 (Scopus ID)bc761dd0-e8ac-11de-bae5-000ea68e967b (Local ID)bc761dd0-e8ac-11de-bae5-000ea68e967b (Archive number)bc761dd0-e8ac-11de-bae5-000ea68e967b (OAI)
Note

Validerad; 2010; 20091214 (emimar)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2022-08-22Bibliographically approved
Martinson, E. & Delsing, J. (2009). Environmental tests of gap discharge emitter for use in ultrasonic gas flow measurements (ed.). Paper presented at International Symposium on Fluid Flow Measurement : 12/08/2009 - 14/08/2009. Paper presented at International Symposium on Fluid Flow Measurement : 12/08/2009 - 14/08/2009.
Open this publication in new window or tab >>Environmental tests of gap discharge emitter for use in ultrasonic gas flow measurements
2009 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

In some situations, the ability to measure gas flows can be very limited due to difficult environmental conditions.Examples of such conditions identified in real situations include very high temperatures of up to 1200°C, low pressuregas, high humidity, dust, heavy surface contamination and large dimensions (1-5m pipe diameters).In this paper, we investigate the performance of the only ultrasound emitter type we expect to be able to handle the mentioned conditions. The transmitter has been developed for harsh condition gas flow measurement using the approach of transit time or sing around technology for flow metering. Tests have been performed in a real environment in the iron ore process industry. The testing environment includes gas flows with condensing moisture, moderate temperatures and heavy surface contamination.The device investigated for the emission of ultrasound uses the principle of electric gap discharge to obtain acousticpressure waves. Since all exposed parts of the emitter can be made using high quality metal and ceramics if necessary,it can be designed for very high temperatures, with a goal of reaching around 1200°C. The tests performed here are divided into two categories: the effects of long term exposure in a bad environment andthe sonic performance in the same environment.The first test revealed that both emitters were capable of surviving the contamination problem and could still work afteralmost 1.5 months in the environment. The signal amplitude difference before and after the test was less than 5%. Insome cases the signal was stronger after the test than before.The second test showed that sound signals feasible for flow measurement under high dust content and high humiditywere obtained. This was shown under realistic operation conditions in an iron ore pelletizing plant. The sound pathvaried from 1.9 – 3m, and the temperatures were moderate, around 30-80°C.From the results in these two tests it can be stated that the idea of using a gap discharge emitter in the above mentioned conditions is a promising way to generate ultrasonic pulses for flow measurements in difficult and unfriendlyenvironments.

Abstract [en]

In some situations, the ability to measure gas flows can be very limited due to difficult environmental conditions. Examples of such conditions identified in real situations include very high temperatures of up to 1200°C, low pressure gas, high humidity, dust, heavy surface contamination and large dimensions (1-5m pipe diameters). In this paper, we investigate the performance of the only ultrasound emitter type we expect to be able to handle the mentioned conditions. The transmitter has been developed for harsh condition gas flow measurement using the approach of transit time or sing around technology for flow metering. Tests have been performed in a real environment in the iron ore process industry. The testing environment includes gas flows with condensing moisture, moderate temperatures and heavy surface contamination. The device investigated for the emission of ultrasound uses the principle of electric gap discharge to obtain acoustic pressure waves. Since all exposed parts of the emitter can be made using high quality metal and ceramics if necessary, it can be designed for very high temperatures, with a goal of reaching around 1200°C. The tests performed here are divided into two categories: the effects of long term exposure in a bad environment and the sonic performance in the same environment. The first test revealed that both emitters were capable of surviving the contamination problem and could still work after almost 1.5 months in the environment. The signal amplitude difference before and after the test was less than 5%. In some cases the signal was stronger after the test than before. The second test showed that sound signals feasible for flow measurement under high dust content and high humidity were obtained. This was shown under realistic operation conditions in an iron ore pelletizing plant. The sound path varied from 1.9 - 3m, and the temperatures were moderate, around 30-80°C. From the results in these two tests it can be stated that the idea of using a gap discharge emitter in the above mentioned conditions is a promising way to generate ultrasonic pulses for flow measurements in difficult and unfriendly environments.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-30457 (URN)44769730-8bf3-11de-8da0-000ea68e967b (Local ID)44769730-8bf3-11de-8da0-000ea68e967b (Archive number)44769730-8bf3-11de-8da0-000ea68e967b (OAI)
Conference
International Symposium on Fluid Flow Measurement : 12/08/2009 - 14/08/2009
Note
Godkänd; 2009; 20090818 (emimar)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2023-09-06Bibliographically approved
Martinson, E. (2009). Robust gas flow metering under extreme industrial conditions (ed.). (Licentiate dissertation). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Robust gas flow metering under extreme industrial conditions
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, a different method for creating acoustic pulses that can be used in the ultrasonic spectrum is proposed. The aim is to develop a robust and reliable system that uses ultrasonic techniques, such as transit time or sing-around, to measure gas flows in extreme environments. Extreme environments involve high temperatures, contaminating dust and sometimes high moisture content. The investigated method in this work utilizes electric spark discharges to generate acoustic pulses. Studies of the gap discharge acoustic emitter were performed in two parts: environmental tests and studies of the transmitted sound. Environmental tests were performed at industrial sites to test the gap discharge emitter when exposed to heavy surface contamination and moderate temperatures. Studies of the transmitted sound were performedwith a primary focus on the time stability of the emitted sound. Due to the nature of the spark discharge phenomena, there are inconsistencies in the transmitted acoustic pulse. When pulses are transmitted and received consecutively, their measured travel times will contain a time jitter relative to each other. This jitter is investigated and put into the perspective of a gas flow measurement situation. Acoustic pulses from the gas discharge emitter are shown to be strong enough to be used in large geometries of several meters. Additionally tests were performed in the industrial environments to determine if the acoustic pulses can be sent through large gas flow ducts and detected at the oppositeside.The tests show that the gap discharge transducer at the prototype stage performs well in a real industrial environment. The emitter continues to work when subjected to heavy contamination. The emitted sound is loud enough to be detected using standard piezo ceramic ultrasonic transducers when sent through large gas flows (air). If used in measurement situations that involve acoustic travel paths longer than around 1.5 meters and gas flows in the range of a few m/s or larger, this emitter can deliver sufficient accuracy.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2009. p. 85
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-17351 (URN)2fb04af0-b8ce-11de-b769-000ea68e967b (Local ID)978-91-7439-013-1 (ISBN)2fb04af0-b8ce-11de-b769-000ea68e967b (Archive number)2fb04af0-b8ce-11de-b769-000ea68e967b (OAI)
Presentation
2009-11-13, A1514, Luleå tekniska universitet, Luleå, 10:00
Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-11-29Bibliographically approved
Martinson, E. (2008). Gasflödesmätning under extrema förhållanden (ed.). In: (Ed.), : . Paper presented at ProcessIT innovations 2008 : 12/03/2008 - 12/03/2008.
Open this publication in new window or tab >>Gasflödesmätning under extrema förhållanden
2008 (Swedish)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-32536 (URN)70ff3b00-0d2c-11dd-9b51-000ea68e967b (Local ID)70ff3b00-0d2c-11dd-9b51-000ea68e967b (Archive number)70ff3b00-0d2c-11dd-9b51-000ea68e967b (OAI)
Conference
ProcessIT innovations 2008 : 12/03/2008 - 12/03/2008
Note

Godkänd; 2008; 20080418 (emimar)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-02-27Bibliographically approved
Martinson, E. & Delsing, J. (2007). Mechanical thermal expansion correction design for an ultrasonic flow meter (ed.). In: (Ed.), (Ed.), 14th International Flow Measurement Conference 2007, FLOMEKO 2007: Sandton, Gauteng, South Africa, 18 - 21 September 2007. Paper presented at International Flow Measurement Conference : 19/09/2007 - 21/09/2007 (pp. 96-101). Red Hook: Curran Associates, Inc.
Open this publication in new window or tab >>Mechanical thermal expansion correction design for an ultrasonic flow meter
2007 (English)In: 14th International Flow Measurement Conference 2007, FLOMEKO 2007: Sandton, Gauteng, South Africa, 18 - 21 September 2007, Red Hook: Curran Associates, Inc., 2007, p. 96-101Conference paper, Published paper (Other academic)
Abstract [en]

When an ultrasonic flow meter system using the transit time technique is subjected to an increasing ambient or fluid temperature, the material in the meter will expand due to thermal expansion. This will affect the measurements due to a mismatch between the calibrated lengths in the meter system and the true lengths that varies with temperature. This paper incorporates a simple idea to reduce this problem. By the insertion of a compensation body behind the transducers the thermal expansion of this body will work to compensate for the errors due to the expansion in the materials that the flow meter is made of. Simulations have been performed to verify the idea and they show on a high level of compensation for the mentioned errors. Theinfluences from thermal expansions can theoretically be reduced to a negligible level.

Place, publisher, year, edition, pages
Red Hook: Curran Associates, Inc., 2007
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-31543 (URN)5c379d50-4b14-11dc-ac5f-000ea68e967b (Local ID)978-161567802-0 (ISBN)5c379d50-4b14-11dc-ac5f-000ea68e967b (Archive number)5c379d50-4b14-11dc-ac5f-000ea68e967b (OAI)
Conference
International Flow Measurement Conference : 19/09/2007 - 21/09/2007
Note
Godkänd; 2007; 20070815 (emimar)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2023-09-06Bibliographically approved
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