A pulse coherent nqr spectrometer with effective transient suppression

Александр Григорьевич Хандожко, Виктор Александрович Хандожко, Андрей Петрович Самила

Abstract


The presence of the quadrupole moments of isotopes of gallium and indium in GaSe and InSe allows applying the radiospectroscopy of nuclear quadrupole resonance (NQR) for studying of the crystal structures of these compounds.

The structure of the pulse coherent spectrometer with a minimum number of functional nodes is proposed.

The source of carrier frequency, oscillations is the frequency synthesizer for filling the probe pulses in the range of NQR resonance frequencies 2 ÷ 50 MHz (isotopes 14N, 69Ga, 71Ga, 113In, 115In). The nuclear spin induction signal after the amplification is fed to a synchronous detector, made on the balanced mixer. The output power amplifier on the field-effect transistor MRF6VP11KH develops an excitation pulse power up to 1 kW in the receiving coil. Restoration of the NQR spectrum of the spin induction signal is carried out by the fast Fourier transform method.

The circuit solutions on the elimination of the receiving coil "ringing" of oscillating circuit of spectrometer and transient suppression in the receive path of the NQR pulse radio spectrometer are proposed. Safe closing of the receive path in the pauses between probe pulses (up to 100 dB for the carrier frequency) is provided by the scheme of three similar cascades on the dual-gate FET.

Keywords


radio spectrometer; NQR; spin induction; Fourier transform; semiconductor; transient; coherence

References


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Lastivka G.I. The electric field gradient asymmetry parameter in InSe / G.I. Lastivka, A.G. Khandozhko, Z.D. Kovalyuk, A.P. Samila // Semiconductor Physics, Quantum Electronics and Optoelectronics. – 2011. № 2. – P. 164-166.

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Gabidullin D.D. A Precision Frequency Synthesizer with Direct Digital Synthesis for a Low-Field Magnetic-Resonance Imager / D.D. Gabidullin, N.M. Gafiyatullin, N.A. Krylatykh, and Ya.V. Fattakhov // Instruments and Experimental Techniques. – 2012. – Vol. 55, № 4. – P. 49-51.

Цифровой осциллограф BORDO B-421. [електронний ресурс] / Режим доступу: http://www. cims.bsu.by/files/B-421.pdf.

RF Power Field Effect Transistors. Technical Data. [електронний ресурс] / Режим доступу: http://www.freescale.com/files/rf_if/doc/data_sheet/MRF6VP11KH.pdf.

Double-balanced mixer and oscillator. [електронний ресурс] / Режим доступу : http://www.stanford.edu/class/ee133/datasheets/SA612A.pdf.

Hex inverting Schmitt trigger with 5 V tolerant input. [електронний ресурс] / Режим доступу: http://www.nxp.com/documents/data_sheet/74LVC14A.pdf.

Bastow, T. J., Cambell, I. D., Whitfeld, H. J. (1981). A 69Ga, 115In NQR study of polytypes of GaS, GaSe and InSe. Sol. St. Com., 39, 307-311.

Hideo Itozaki, Go Ota. (2007). Nuclear quadrupole resonance for explosive detection. International journal on smart sensing and intelligent systems, 1(3), 705-715.

Kovalyuk, Z. D., Lastivka, G. I., Khandozhko, A. G. (2009). Fine structure of NQR Spectra in GaSe. Semiconductor physics, Quantum electronics and Оptoelectronics, 12(4), 370-374.

Lastivka, G. I., Khandozhko, A. G., Kovalyuk, Z. D., Samila, A. P. (2011). The electric field gradient asymmetry parameter in InSe. Semiconductor Physics, Quantum Electronics and Optoelectronics, 2, 164-166.

Rudakov, T. N., Shpilevoi, A. A. (1997). An Input Device for the Receiving Channel of a Nuclear Quadrupole Resonance Spectrometer. Instruments and experimental techniques, 40(2), 215-216.

Gabidullin, D. D., Gafiyatullin, N. M., Krylatykh, N. A., Fattakhov, Ya. V. (2012). A Precision Frequency Synthesizer with Direct Digital Synthesis for a Low-Field Magnetic-Resonance Imager. Instruments and Experimental Techniques, 55(4), 49-51.

Tsifrovoy ostsillograf BORDO B-421. Aailable: http://www. cims.bsu.by/files/B-421.pdf.

RF Power Field Effect Transistors. Technical Data. Aailable: http://www.freescale.com/files/rf_if/doc/data_sheet/MRF6VP11KH.pdf.

Double-balanced mixer and oscillator. Aailable: http://www. stanford.edu/class/ee133/datasheets/SA612A.pdf.

Hex inverting Schmitt trigger with 5 V tolerant input. Aailable: http://www.nxp.com/documents/data_sheet/74LVC14A.pdf.


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Copyright (c) 2014 Александр Григорьевич Хандожко, Виктор Александрович Хандожко, Андрей Петрович Самила

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061