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Content available remote Regulated common-gate TIA with noise improvement for radiation detectors
A Transimpedance Amplifier (TIA) is a device which performs current-voltage conversion and signal shaping. The most commonly used solution is an Avalanche Photo-Diode (APD) as radiation detector with a feedback TIA. Recently, Silicon Photo-Multipliers (SiPMs), have proven to be good alternatives. The main objective in this paper is to show, evaluate and compare the behavior of a regulated common-gate (RCG) TIA when the light sensitive device is an APD or a SiPM. We will also present two alternative circuits based on the RCG topology. The first can be resumed to the insertion of a transistor, responsible for an improvement in the output noise response of the TIA. This solution proves itself to be a good alternative, since it will improve the Signal-to-Noise Ratio (SNR) of the circuit by around 3 dB, with negligible penalty in consumption (only 2%). The second alternative will be a proposed differential version of the RCG topology, in which the first solution will be included. These two latter solutions will only be tested with a SiPM at the input. We will also study the RCG topology in a RF front-end, providing there is a passive mixer at the TIA’s input. The proposed circuits are simulated with standard CMOS technology (UMC 130 nm), from a 1.2 V supply.
Content available Ochrona radiologiczna portów lotniczych
W artykule przedstawiono system informatyczny przeznaczony do ochrony radiologicznej portów lotniczych. Przedstawiono podstawowe elementy bloku detekcji promieniowania gamma i neutronowego oraz rozwiązanie systemu informatycznego do ich zarządzania i monitorowania. Z uwagi na specyfikę obiektu jakim są porty lotnicze, ważnym elementem systemu informatycznego jest identyfikacja źródła promieniowania. Zaprezentowano rozwiązanie tego zagadnienia.
In the paper an information system designed for radiological protection of airports is presented. Basic elements of the block detecting gamma and neutron radiation (Fig. 1) and the block diagram of a computer system for managing and monitoring are outlined. The detection block is used for detection of nuclear and radioactive materials. Detectors presented in the paper are manu-factured by Polish Company Relpol Ltd. They are a new generation of radiation detectors and can be used at border crossings, airports, nuclear factories, etc. The detection blocks can be monitored by a local control module or remotely by an information system which can managed up to 16 detection blocks. The information system collects from the detection blocks the data about its current status and events and stores this information in its data base. Due to the fact that airports are a specific object, the important component of a radiological system is identification of the place of radiation sources. A solution to this issue is based on integration of the data from the detection block and a picture from an IP camera. The functional solution and the view of the main window of the radiology system with precise identification of the radiation source are shown in Figs. 4 -7.
W artykule zaprezentowany zostanie rozproszony system informatyczny przeznaczony do nadzoru pracy stacjonarnych monitorów promieniowania (SMP). W artykule zostaną zaprezentowane urządzenia SMP wraz ich możliwościami i wybranymi parametrami oraz przedstawione zostaną możliwości systemu informatycznego zbudowanego do ich nadzoru. System wykorzystuje nowoczesne technologie, takie jak technologie sieciowe, kamery video IP do dokumentowania zdarzeń oraz bazy danych do przechowywania informacji.
In the paper Stationary Radiation Monitors (SRMs) and a radiology control system based on them are presented. SRMs manufactured by the division Polon of the Relpol company are described. Selected parameters of the elaborated SRM and information system to supervise their work are outlined. Components of the SRM are shown in figure 1. The basic SRM components are gamma and neutron detection modules and a control module with a touch screen and thermal printer. SRMs are used for detection of nuclear and radioactive materials. SRMs presented in the paper are a new generation of gamma and neutron radiation detector devices and can be used on border crossings, airports, nuclear factories, etc. SRMs installed in the field can be configured and monitored by a local control module or remotely by a monitoring system. The monitoring system can manage up to 16 SRMs. The monitoring system collects information about the SRM current status and events generated by the SRM and stores them in a data base. The functional and program modules and the main window view of the monitoring program are shown in figures 3 and 4. The new generation of SRMs is equipped with intelligent IP cameras with pre-triggering function. This function allows tracing a picture up to one minute before the alarm occurs. Video pictures and alarms are stored in the monitoring system data base and can be displayed by the authorized personnel.
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