| 131. |
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| 132. |
- Norlin, Börje, 1967-, et al.
(författare)
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Energy Resolved X-ray Imaging as a Tool for Characterization of Paper Coating Quality
- 2009
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Ingår i: IEEE Nuclear Science Symposium Conference Record 2009. - : IEEE conference proceedings. - 9781424439621 ; , s. 1703-1706
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Konferensbidrag (refereegranskat)abstract
- Energy resolved X-ray imaging can be used as a tool to analyze the variation in the chemical content of an object. In this work we have used energy resolved X-ray imaging to measure the variation in the chemical content of paper and paper coating. This is an important quality parameter for the paper industry. In order to separate the variation in coating thickness from the variation in paper thickness, energy resolution is used to separate the response of the coating from the response of the paper. The MEDIPIX2 single photon processing X-ray imaging system [1] has been used in the measurements. The measurement results are compared to simulations with MCNP. The influence of charge sharing is discussed and the effects have been studied by comparing results from detectors with 220x220 µm2 pixels and detectors with 55x55 µm2 pixels. There is a trade-off between good spatial resolution obtained with detectors with small pixels and good energy resolution obtained with detectors with large pixels. The requirements on image quality, to achieve the resolution of coating distribution relevant for the application, are discussed.
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| 133. |
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| 134. |
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| 135. |
- Oelmann, Bengt, et al.
(författare)
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All-Digital Window Discriminator for Photon Counting Pixel Detectors
- 2001
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194. ; 37:6, s. 373-374
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Tidskriftsartikel (refereegranskat)abstract
- An all-digital window discriminator is presented. It is event-driven and does not rely on any external or internal timing references. In addition, it provides an area-efficient implementation of photon counting pixel detectors. The transistor-level implementation of the circuit is presented with its circuit area and timing performance.
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| 136. |
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| 137. |
- Oelmann, Bengt, et al.
(författare)
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Automatic FSM synthesis for low-power mixed synchronous/asynchronous implementation
- 2001
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Ingår i: VLSI design (Print). - 1065-514X .- 1563-5171. ; 12:2, s. 167-186
-
Tidskriftsartikel (refereegranskat)abstract
- Power consumption in a synchronous FSM (Finite-State Machine) can be reduced by partitioning it into a number of coupled sub-FSMs where only the part that is involved in a state transition is clocked. Automatic synthesis of a partitioned FSM includes a partitioning algorithm and sub-FSM synthesis to an implementation architecture. In this paper, we first introduce an implementation architecture for partitioned FSMs that uses gated-clock technique for disabling idle parts of the circuits and asynchronous controllers for communication between the sub-FSMs. We then describe a new transformation procedure for the sub-FSM. The FSM synthesis flow has been automated in a prototype tool that accepts an FSM specification. The tool generates RT-level VHDL code with identical cycle-to-cycle input/output behaviour in accordance to with the specification. An average power reduction of 45% has been obtained for a set standard FSM benchmarks.
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| 138. |
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| 139. |
- Oelmann, Bengt, et al.
(författare)
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LIFS: A Tool for Low-Power Implementation of FSMs
- 1999
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Ingår i: Proceedings of the 17th IEEE Norchip Conference.
-
Konferensbidrag (refereegranskat)abstract
- We present a tool (LIFS) for low-power implementation of finite state machines (FSMs). The tool decomposes a FSM into several small communicating sub state machines (partitions). Low-power operation is achieved since only one partition is active (clocked) at a time, thus fewer registers need to be clocked. The hand-over mechanism between different partitions in the final state machine is controlled by asynchronous controllers. By using an asynchronous hand-over mechanism our approach has up to five times less power overhead than comparable approaches. To show the effectiveness of the LIFS tool, we present experimental results from standard benchmark examples.
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| 140. |
- Oelmann, Bengt, et al.
(författare)
-
Robust window discriminator for photon-counting pixel detectors
- 2002
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Ingår i: IEE Proceedings - Optoelectronics. - : Institution of Engineering and Technology (IET). - 1350-2433 .- 1359-7078. ; 149:2, s. 65-69
-
Tidskriftsartikel (refereegranskat)abstract
- The paper proposes a robust and area-efficient way of designing window discriminators for photon-counting pixel detectors. For that, an all-digital window discriminator is proposed. It is event-driven and does not rely on any external or internal timing references, which makes it possible to use it over a wide range of specifications. In addition, it provides an overall area efficient implementation of the digital electronics in photon-counting pixel detectors. The transistor-level implementation of the circuit is presented with its circuit area and timing performance.
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