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ADC/MCA Module With PC Interface (RS232/RS485/USB/Ethernet)

ADC/MCA Module With PC Interface (RS232/RS485/USB/Ethernet). Georgi Georgiev , Ivaylo Peev Institute For Nuclear Research And Nuclear Energy Bulgarian Academy Of Sciences. The Goal. Building a combination of fast ADC with low differential non-linearity (DNL) and multi-channel analyzer.

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ADC/MCA Module With PC Interface (RS232/RS485/USB/Ethernet)

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  1. ADC/MCA Module With PC Interface(RS232/RS485/USB/Ethernet) Georgi Georgiev, Ivaylo Peev Institute For Nuclear Research And Nuclear Energy Bulgarian Academy Of Sciences Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  2. The Goal • Building a combination of fast ADC with low differential non-linearity (DNL) and multi-channel analyzer. • Compact size. • Operate multiple ADC/MCA modules by one computer. • Remote operation and management over TCP/IP. Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  3. The Solution • Using Gatti correction proposed by C. Cottini, E.Gatti and V.Svelto in 1963. • Involving modern technology. • Fast A/D and D/A converters. • Programmable logic devices. • “Smart” approach. Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  4. Implementation Electronic Control DAC Pile Up Gate ADC with S/H Input stages ADC/MCA Control Logic & RAM FPGA Input Processor Precise DAC PC Interface (USB/Ethernet) Peak Detector Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  5. Main Points • Precise peak detector used for accurate start of measurement process. • Fixed dead time differential input ADC with S/H. • Only one precise voltage reference source is used in order to minimize possible errors. • Predefined spectra capture time (Live time). Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  6. Main Points • High precision DAC used to shift the measurement point on each event. • 4-channel DAC used to control LLD, ULD and other parameters. • Fully buffered spectra capture and transfer. • Micro-controller manages the communication channel and handles the protocol. • Optically isolated interface (RS232/485/USB). Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  7. The device Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  8. Features and performance • Total processing time of 640ns. • No added dead time for pulses with 125ns shaping time. • 1k, 2k and 4k channel spectra captured. • Digital control of LLD, ULD and other front-end parameters. Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  9. Software Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  10. Sample results 25.19 KeV 8.04 KeV Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  11. Possible signal sources • SDD detectors. • NaI(Tl) scintillators. • Conventional detectors. Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

  12. Applications • Fast on-line analysis. • Analysis using high intensity sources. Georgi Georgiev, Ivaylo Peev - Bulgarian Academy Of Sciences

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