| 1. |
- Westin, Jonathan, 1980, et al.
(författare)
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Digitising Sensitive Heritage Monuments In Antarctica
- 2024
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Ingår i: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLVIII-2/W4-2024. 10th International Workshop 3D-ARCH "3D Virtual Reconstruction and Visualization of Complex Architectures, 21–23 February 2024, Siena, Italy / editor(s): S. Campana, F. Fassi, and F. Remondino. - : International Society for Photogrammetry and Remote Sensing. - 1682-1750.
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Konferensbidrag (refereegranskat)abstract
- During the Antarctica expedition CHAQ2020, several cultural heritage sites – remains from the Swedish South Polar Expedition (1901–1903) – were documented using a range of different techniques and technologies. These physical monuments and environments are for all intents and purposes unavailable for most researchers due to their remote location and are also threatened by the effects of climate change. Hence, the deployed documentation techniques and technologies were selected both as a consequence of the inherently difficult conditions in Antarctica, where their reliance, durability, and speed were key considerations, but also for their perceived ability to document the unique and fragile environment. The documentation was carried out with the double intention of both allowing for observations in situ through processes of analytical drawings and data capture, but also capturing the environment as broadly and deeply as possible, in essence making a copy of it open for studies of unknown unknowns, that could serve as a source material for research questions still undefined. Hence, with the documentation of the winter station on Snow Hill Island as a case study, and with a perspective on documentation as a method through which to process, preserve, and disseminate information, this article serves to critically detail, compare, and evaluate the digital techniques and technologies that the expedition deployed to capture architectural elements and spatial contexts, and the data that could be obtained through these.
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| 2. |
- Bengtsson, Lars, 1963
(författare)
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Embedded FPGA systems : VHDL programming and soft CPU systems
- 2018
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- This textbook introduces the reader to VHDL which is a Hardware Description Language, i.e. a means to describe digital electronic circuits in a text editor and how to compile this text into electronics. The first part is concluded by writing VHDL code for a simple CPU (a "soft CPU"). In the second part, a commercial soft CPU is downloaded to the FPGA target circuit and programmed in C.
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| 3. |
- Bengtsson, Lars, 1963
(författare)
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Embedded Measurement Systems
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The subject of Embedded Measurement Systems (EMS) is the merging of embedded systems and electrical measurement systems. This indicates that EMSs are hardware-software systems dedicated to measuring one or a few physical quantities. Applications are numerous; EMSs measure the temperature in refrigerators, freezers, irons, ovens and automobile combustion engines, they sense vibrations in tilt alarms and game consoles, they measure airflow in engines and ventilation systems, they measure shock impact in crash detectors and are used as shock and temperature loggers for transport goods, they measure air pressure in airplane cabins, humidity in air-conditioned environments, they measure liquid levels in fuel tanks, they detect smoke in fire alarms, they measure the viscosity of lubricant oil in engines, they measure the rotation speed of spinning wheels (in any engine), they measure torque in engines and are used as heart rate and ECG detectors in medicine etc. The commercial demand for ever cheaper products and worldwide environmental legislations force vendors to continuously look for more cost-efficient and less power-consuming solutions for their embedded measurement systems. This thesis is concerned most of all with the implementation of cost-efficient/low-power measurement systems in embedded controllers. This includes some novel ideas in voltage, time and resistance measurements with embedded controllers and it will demonstrate how these quantities, analog in nature, can be measured accurately and precisely by inherently digital embedded controllers.
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| 4. |
- Bengtsson, Lars, 1963
(författare)
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New design ideas for TDR-based liquid level detectors
- 2017
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Ingår i: I2MTC 2017 - 2017 IEEE International Instrumentation and Measurement Technology Conference. 22-25 May 2017. Turin, Italy. Proceedings. - : IEEE. - 1091-5281. - 9781509035960
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Konferensbidrag (refereegranskat)abstract
- This work suggests some new solutions to TDR-based liquid level detectors. A 3D-printed waveguide cylinder has been designed in order to increase the sensitivity of the level measurement. By wrapping the probing waveguide-pair around a cylinder, an inclination angle ϕ is introduced which increases the time-of-flight by a factor of 1/sinϕ and hence the level resolution is increased (by the same factor). This work also illustrates how nanosecond pulses (for TDR systems) can be generated by applying a technique usually found in FIMs (Field Ion Microscopes). A time resolution of 2 ns/mm (of liquid level) is reported and a generic nanosecond pulse generator isdemonstrated.
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| 5. |
- Bengtsson, Lars, 1963
(författare)
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Single-Chip Implementation of Level-Crossing ADC for ECG sampling
- 2017
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Ingår i: Journal of Electrical & Electronic Systems. - : OMICS Publishing Group. - 2332-0796. ; 6:1
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Tidskriftsartikel (refereegranskat)abstract
- This work demonstrates for the first time the implementation of a level-crossing analog-to-digital converter (LC-ADC) in a single, commercially available IC (that costs less than $2). The implementation utilizes adaptive threshold levels in order to prevent overload distortions for fast-changing signals. The entire design is based on a 20-pin PIC16F1769 microcontroller from Microchip and no external components are required. In fact, the only external circuitry required is a single jumper wire. This is due to the fact that the new generation of microcontrollers have integrated core-independent hardware, analog as well as digital. This design takes full advantage of the core-independent logic and analog blocks in a PIC16F17xx circuit to implement the LC-ADC technique that so far has required multiple-circuit designs or ASIC implementation. The design is demonstrated on a standard electrocardiogram (ECG) signal.
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| 6. |
- Bengtsson, Lars, 1963
(författare)
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Single-chip Implementation of LVDT Signal Conditioning
- 2018
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Ingår i: American Journal of Sensor Technology. - 2373-3454 .- 2373-3462. ; 5:1, s. 7-16
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this work was to prove that the signal conditioning electronics for linear variable transformers (LVDTs) can be implemented in inexpensive, general-purpose 8-bit microcontrollers, making expensive dedicated signal conditioning chips redundant. A low-cost, high-resolution signal conditioning solution for LVDTs is presented. Apart from a few external passive components, the entire solution is implemented in a low-cost, analog-digital hybrid microcontroller. The excitation sinusoid is generated by filtering out the fundamental frequency of a (self-sustained) pwm-generated square wave and the secondary coils’ signals are demodulated with classic peak detector circuits implemented in the microcontroller using a combination of its embedded analog and digital building blocks. A resolution of 1 μm over a range of ±6.35 mm for a commercial LVDT is reported and an uncertainty of 6 μm in the absolute value is deduced. The entire solution is implemented as surface mounted components on a small printed circuit board and the LVDT core displacement is displayed on an LCD display. Due to the simplicity and low-cost components required, this signal conditioning proposal has the potential to have a significant impact on commercial LVDT signal conditioning chips in the future since it is significantly less expensive than the present state-of-the-art signal conditioning chips offered by the main commercial suppliers and other solutions previously suggested in scientific literature.
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| 7. |
- Behdadi, Dorna, 1988, et al.
(författare)
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A Normative Approach to Artificial Moral Agency
- 2020
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Ingår i: Minds and Machines. - : Springer Science and Business Media LLC. - 0924-6495 .- 1572-8641. ; 30:2, s. 195-218
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Tidskriftsartikel (refereegranskat)abstract
- This paper proposes a methodological redirection of the philosophical debate on artificial moral agency (AMA) in view of increasingly pressing practical needs due to technological development. This “normative approach” suggests abandoning theoretical discussions about what conditions may hold for moral agency and to what extent these may be met by artificial entities such as AI systems and robots. Instead, the debate should focus on how and to what extent such entities should be included in human practices normally assuming moral agency and responsibility of participants. The proposal is backed up by an analysis of the AMA debate, which is found to be overly caught in the opposition between so-called standard and functionalist conceptions of moral agency, conceptually confused and practically inert. Additionally, we outline some main themes of research in need of attention in light of the suggested normative approach to AMA.
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| 8. |
- Bengtsson, Lars, 1963
(författare)
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Electrical interferences in electrical measurement systems demystified
- 2012
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Ingår i: International Journal of Electrical Engineering Education. - 0020-7209. ; 49:2, s. 101-113
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Tidskriftsartikel (refereegranskat)abstract
- This paper is concerned with the practical aspects of protecting an electrical measurement system against different kinds of interfering cross-talk. We categorize different kinds of cross-talk, describe their origin and how to decoupled them in order to protect the system. This presentation is a primer for students or application engineers concerned with the practical operation of an electrical measurement system. We explain cross-talk phenomena with a minimum of electromagnetic theory, focusing more on understanding the origin of cross-talk in terms of basic electric and magnetic circuits rather than advanced electromagnetic wave equations, and how to decouple them. Compared to a typical textbook presentation on the subject, this work categorizes all kinds of electromagnetic interferences (EMI), using a minimum of mathematic equations, and clearly explain their origin and illustrates clearly how each one is decoupled.
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| 9. |
- Bengtsson, Lars, 1963
(författare)
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Signalbehandling
- 2003
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Ingår i: Tabeller och Formler. - Stockholm : Liber AB. - 9147050926 ; , s. 355-360
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Denna formel- och tabellsamling innehåller grundläggande definitioner, tabeller och formler inom det naturvetenskapliga och tekniska området. Boken är lämplig för högskoleingenjörsutbildning och grundläggande utbildningar för civilingenjörer. Författarnas inriktning har varit att ge boken en sådan bredd att den också kan användas som referenslitteratur på gymnasiet.
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| 10. |
- Bengtsson, Lars, 1963
(författare)
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Embedded Vernier TDC with sub-nano second resolution using fractional-N PLL
- 2017
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Ingår i: Measurement. - : Elsevier BV. - 0263-2241. ; 108, s. 48-54
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Tidskriftsartikel (refereegranskat)abstract
- A novel implementation technique for Vernier-based time-to-digital converters is reported. It is based on fractional-N phase-locked loops which allows the design of Vernier clocks with very close frequencies. The Vernier registers comparing counter values have been implemented in hardware in order to guarantee minimum detection latency of the moment of coincidence. Two Vernier clocks with close frequencies increment two 24-bit counters in a Cyclone V FPGA. A Vernier TDC with a demonstrated time resolution of 476 ps is reported. It is also established that the time resolution limit that can be achieved with the suggested design is 10 ps.
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