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- 摘要
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- 实验方案
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Data Acquisition System for ITER Neutron Diagnostic Divertor Neutron Flux Monitor
摘要： The ITER nuclear diagnostics Divertor Neutron Flux Monitor (DNFM) is designed to determine the ITER fusion power. DNFM diagnostic provides a neutron yield and fusion power measurements for both deuterium-deuterium and deuterium-tritium plasmas with the required time resolution and uncertainty. The data acquisition system (DAQ) is a part of the DNFM diagnostic. This system is designed for signal processing of the three neutron detectors modules, each including six fission chambers (FC). The DAQ system performs the following functions: FCs bias generation and signals detection; transformation of the measurement data into neutron flux values at the location of the detector module; detectors module FCs and measurement channels calibration with external neutron source; data transfer to the upper systems – CODAC; diagnostics of measurement channels and their components, including a detector modules and a communication lines.
关键词： Divertor Neutron Flux Monitor,Neutron Diagnostic,Fission Chambers,ITER,Data Acquisition System
更新于2025-09-11 14:15:04
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[IEEE 2018 International Conference on Indoor Positioning and Indoor Navigation (IPIN) - Nantes, France (2018.9.24-2018.9.27)] 2018 International Conference on Indoor Positioning and Indoor Navigation (IPIN) - Geometric Constraint Model and Mobility Graphs for Building Utilization Intelligence
摘要： In recent years the availability of mobile indoor way finding technologies, Internet-of-Things sensor infrastructures, and geographic information systems has dramatically increased. These systems have been introduced for many reasons, such as: increasing accessibility to users with reduced mobility, optimizing logistics, or reducing the environmental impact of facilities. While these technologies can bring some new insight in how buildings are used, they all suffer from limitations in coverage, accuracy, or scalability. However, when they are combined, a new window into the understanding of human mobility and building utilization is opened. This paper introduces methods to increase accuracy of data obtained from an off-the-shelf commercial indoor navigation by including Internet of Things (IoT) sensor infrastructure and geographic information through a Geometric Constraint Model (GCM). Furthermore, a Mobility Graph (MG) is introduced to visualize trajectory distributions. A simple experiment was conducted to validate the methods. For this, a long narrow hall was equipped with iBeacon infrastructure, an indoo.rs Navigation instance, and a few cheap Raspberry Pi based sensor stations. The environment was mapped using state-of-art geodetic measurements, and a set of recorded experiments were made. In such a long and narrow environment the indoor navigation system is unable to resolve features along the short traverse axis. Without a combined analysis, a divider in the environment is not discernible in the MG, while results using the GCM introduced in this paper clearly indicate the presence of this divider. Automating this approach, can bring indoor location analytics from a descriptive to a prescriptive regime. Furthermore, the application of MG provide a useful tool to better understand large indoor navigation data sets.
关键词： Indoor navigation,Internet of Things,Data Mining,Data Acquisition,Particle Filter
更新于2025-09-10 09:29:36
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An FPGA-Based Backend System for Intravascular Photoacoustic and Ultrasound Imaging
摘要： The integration of intravascular ultrasound (IVUS) and intravascular photoacoustic (IVPA) imaging produces an imaging modality with high sensitivity and specificity which is particularly needed in interventional cardiology. Conventional side-looking IVUS imaging with a single-element ultrasound (US) transducer lacks forward-viewing capability, which limits the application of this imaging mode in intravascular intervention guidance, Doppler-based flow measurement, and visualization of nearly or totally blocked arteries. For both side-looking and forward-looking imaging, the necessity to mechanically scan the US transducer limits the imaging frame rate, and therefore array-based solutions are desired. In this paper, we present a low-cost, compact, high-speed, and programmable imaging system based on a field-programmable gate array (FPGA) suitable for dual-mode forward-looking IVUS/IVPA imaging. The system has 16 US transmit and receive channels and functions in multiple modes including interleaved photoacoustic (PA) and US imaging, hardware-based high-frame-rate US imaging, software-driven US imaging, and velocity measurement. The system is implemented in the register-transfer level, and the central system controller is implemented as a finite state machine. The system was tested with a capacitive micromachined ultrasonic transducer (CMUT) array. A 170-frames-per-second (FPS) US imaging frame rate is achieved in the hardware-based high-frame-rate US imaging mode while the interleaved PA and US imaging mode operates at a 60-FPS US and a laser-limited 20-FPS PA imaging frame rate. The performance of the system benefits from the flexibility and efficiency provided by low-level implementation. The resulting system provides a convenient backend platform for research and clinical IVPA and IVUS imaging.
关键词： software/hardware co-design,velocity measurement,ultrasound imaging,Photoacoustic imaging,FPGA,data acquisition,finite state machine
更新于2025-09-10 09:29:36
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Implementation of a Hyperspectral X-ray Camera control and processing software chain
摘要： Hyperspectral X-ray detectors, which provide the full energy spectrum detected by each individual pixel, have become available for use in lab-based facilities. The addition of spectral information currently comes at the cost of low overall acceptable ?ux rates, and can introduce countrate nonlinearity at higher energies. Neither of these drawbacks are desirable for transmission imaging and tomography. In this paper a new data processing software chain is presented for the SLcam, a pnCCD-based hyperspectral camera prototype, allowing for more control over the conversion from raw frames to hyperspectral images. Complementary to the processing software, a set of live data visualisations was developed to aid in monitoring ongoing experiments and to allow for preliminary data processing on-the-?y. The combination of these software elements forms the ?rst step towards general applicability of hyperspectral imaging at laboratory tomography setups.
关键词： Data acquisition concepts,Detector control systems,X-ray detectors,Solid state detectors
更新于2025-09-10 09:29:36
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A synchronization and data acquisition system for silicon detectors
摘要： A dedicated synchronization bus has been developed and integrated into the FITPix COMBO device. It can be used as Timepix read-out (involving back-side-pulse acquisition) or as a simple spectrometer device — Spectrig (when an external single pad sensor is connected, e.g. ?E detector). The synchronization bus permits the implementation of a system of up to 32 distinct devices running in clock locked mode while the absolute value of the timestamp is distributed to all devices in the system. Any combination of Timepix or spectrometer devices (up to 32) can be connected-up to create a ?nal measurement set-up. The synchronization bus has also been designed to control a trigger signal and busy signal to allow an e?ective ?ltration of unpaired events when coincidence measurement is performed. The system has been tested with a ?E?E telescope consisting of a thin detector and Timepix. The thin detector has been used for ?E and the Timepix detector for E measurements. The ?E detector has an area of 10 × 10 mm2 and a thickness of 12 μm with non-uniformity of 8%. The area and thickness of Timepix are 14 × 14 mm2 and 300 μm, respectively. The detection system can provide simultaneous information about position, energy, time and type of registered particles with high synchronization accuracy. Test measurements have been carried out with an alpha particle source (Ra-226) in a vacuum and the results of these measurements are presented in this paper.
关键词： Trigger concepts and systems (hardware and software),Instrumentation and methods for heavy-ion reactions and ?ssion studies,Ion identi?cation systems,Data acquisition concepts
更新于2025-09-09 09:28:46
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Timepix3 detector network at ATLAS experiment
摘要： We describe the technical design and show results of first measurements of a network based on the Timepix3 and the Katherine readout (with Gigabit Ethernet interface) installed in the ATLAS cavern in the LHC in January 2018. The network consists of four Timepix3 detectors, arranged in two two-layer telescopes. All detectors in the network are synchronized with each other and the LHC orbit clock. The technical solution and the concept of the project are described in details. Since the radiation field inside ATLAS is rather harsh, only the detector units (sensors with power supplies) of the system are placed in the cavern. The detectors are connected to the readout electronics (situated in a rack room with radiation levels comparable to the natural background radiation) by 80 m long cables. The technical design was tested for distances up to 120 m. First measurements are presented, which demonstrate the capabilities of the ATLAS-TPX3 network.
关键词： Data acquisition concepts,Detector control systems,Trigger concepts and systems
更新于2025-09-04 15:30:14
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NOVEL DATA ACQUISITION METHOD FOR INTERFERENCE SUPPRESSION IN DUAL-CHANNEL SAR
摘要： Various interference sources either intentional or unintentional can mask the synthetic aperture radar (SAR) signals and cause image degradation. With a novel data acquisition mode, a new method based on dual-channel SAR is applied to suppress the interference. Using the received dual-channel data, the two-dimensional location of the interference source can be estimated and then the interference can be removed via a Two-Channel-Cancelation method. By establishing a linear model of the interference-removed signal, the SAR image is reconstructed based on compressed sensing (CS) theory. Our method requires only a minor change to the traditional SAR system hardware while obtains a higher resolution. Simulation results are shown to demonstrate the validity of the proposed method.
关键词： interference suppression,SAR,dual-channel,data acquisition,compressed sensing
更新于2025-09-04 15:30:14