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[en] With the theory and characteristic of the high-energy X-ray ICT's data acquisition system,the structure of the data acquisition system is introduced, and explains the controlling arithmetic for the integrator IVC102 and A/D convertor AD7679, which is based on FPGA. (authors)
[en] We are developing a new device for explosive and chemical detection using the Associated Particle Imaging (API) technology and based on a new Associated Particle Sealed Tube Neutron Generator (APSTNG) which specifications comply with one of the basic requirements of a portable device: it must be light. Our objective is to have a total weight lower than 25 kg. This includes the neutron generator, its VHV supply, the detectors, the data acquisition system and all the electronics. Everything is in a suitcase that can be put near an object the content of which one wants to know. Few minutes are enough to identify what is inside and to detect illicit materials as explosives or chemicals. The device will be globally described and the first laboratory results will be presented. (author)
[en] The primary motivation for building neutrino telescopes is to open the road for neutrino astronomy, and to offer another observational window for the study of cosmic ray origins. Other physics topics, such as the search for WIMPs, can also be developed with neutrino telescope. As of March 2008, the IceCube detector, with half of its strings deployed, is the world largest neutrino telescope taking data to date and it will reach its completion in 2011. Data taken with the growing detector are being analyzed. The results of some of these works are summarized here. AMANDA has been successfully integrated into IceCube data acquisition system and continues to accumulate data. Results obtained using only AMANDA data taken between the years 2000 and 2006 are also presented. The future of IceCube and the extensions in both low and high energy regions will finally be discussed in the last section
[en] Complete text of publication follows. The U. S. Geological Survey Geomagnetism Program is now collecting one-second triaxial fluxgate magnetometer data at its observatories. Extensive testing is being done to validate the data and document its resolution and timing accuracy. Magnetometer resolution is evaluated by examining the second-to-second differences of each individual component to estimate the noise level. The noise level is determined for the data acquisition system itself and then at each observatory site. Timing accuracy is tested by using the one pulse per second (PPS) output from a GPS clock to trigger a pulse generator with delay. Through this test we are able to quantify the delay introduced by each component of our data acquisition system, including the fluxgate magnetometer and A/D converter. As a second test of timing accuracy, a sine wave is used to examine the delay in the analog output from the fluxgate. The results of these tests are compared with the standards of 0.01 nT resolution and 10 millisecond time accuracy as proposed by Intermagnet in 2008.
[en] A Data Acquisition System using the Domino Ring Sampler chip is being developed for use in the Magic experiment. We present the main features of this system and the results of a test on the Magic-I telescope
[en] The CMS Data Acquisition System is designed to build and filter events originating from 476 detector data sources at a maximum trigger rate of 100 KHz. Different architectures and switch technologies have been evaluated to accomplish this purpose. Events will be built in two stages: the first stage will be a set of event builders called FED Builders. These will be based on Myrinet technology and will pre-assemble groups of about 8 data sources. The second stage will be a set of event builders called Readout Builders. These will perform the building of full events. A single Readout Builder will build events from 72 sources of 16 KB fragments at a rate of 12.5 KHz. In this paper we present the design of a Readout Builder based on TCP/IP over Gigabit Ethernet and the optimization that was required to achieve the design throughput. This optimization includes architecture of the Readout Builder, the setup of TCP/IP, and hardware selection
[en] Motivations, applications and design of the Fast Tracker upgrade for the ATLAS trigger are reported. The system would increase flexibility and power of the ATLAS high-level triggers by providing full inner detector tracking to all trigger algorithms within a short latency.
[en] In the new KLOE2 experiment, at DAΦNE particle accelerator of LNF-INFN, a pair of tagger detectors will be installed in order to investigate gamma-gamma physics. We shall need to acquire a 32 bits pattern for each detector and to allow a high time-resolution event reconstruction with KLOE data. The acquisition system will be implemented with Virtex-5 FPGA in order to avoid expensive TDC. The real time sampling and holding system, reference providing system, memorization and transfer data system will be described.
[en] Data acquisition systems (DAS) play a fundamental role in a lot of modern measurement solutions. One of the parameters characterizing a DAS is its maximum sample rate, which imposes constraints on the signals that can be alias-free digitized. Bandpass sampling theory singles out separated ranges of admissible sample rates, which can be significantly lower than carrier frequency. But, how to choose the most convenient sample rate according to the purpose at hand? The paper proposes a method for the automatic selection of the optimal sample rate in measurement applications involving bandpass signals; the effects of sample clock instability and limited resolution are also taken into account. The method allows the user to choose the location of spectral replicas of the sampled signal in terms of normalized frequency, and the minimum guard band between replicas, thus introducing a feature that no DAS currently available on the market seems to offer. A number of experimental tests on bandpass digitally modulated signals are carried out to assess the concurrence of the obtained central frequency with the expected one
[en] To increase accurateness and reliability of the evaluation of power tool vibration transmitted to an operator, it is necessary to measure the grip and feed forces during the measurement of hand-transmitted vibration. In the study a system was invented to measure the vibration and the grip and/or feed force, which consists of a measurement handle and a PC with a data acquisition system and the corresponding software. Strain gages and an accelerometer were mounted on the handle surface for the simultaneous measurement of the forces and the vibration. The program in the system makes it possible to monitor the grip and feed force during the tool operation so that the operator keeps the applying forces within the pre-determined range. Investigating the vibration total values, frequency-weighted root-mean-square accelerations at the handle, obtained in repetition for each power tool with control of the grip and feed force showed more consistency than those measured without force control. By using the system the experimenter can reduce uncertainty in measurement of hand-held power tool vibration