A portable Digital Multipulse NQR Spectrometer for the Study of the Sensory Properties, Structure and Defects in Layered Semiconductors

Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA

“…As a hardware base for the implementation of the proposed configuration structure, we used the motherboard of a pulsed NQR sensor ( Figure 7 a), the operating principle of which is described in detail in [ 21 , 31 ]. The core of the motherboard is an FPGA EP4CE15E22C8, the internal structure of which contains more than 15,000 logic gates.…”

A Low-Cost Digital Pulsed Coherent Spectrometer for Investigation of NQR in Layered Semiconductor GaSe and InSe Crystals

“…A block diagram of the developed device is simple, since all main modules of digital processing and synthesis on the field-programmable gate array (FPGA) are implemented ( Figure 1). In more detail, this block diagram and the principle of operation are described in paper [1]. Some parts and units of the proposed device are described in detail in papers [14][15][16][17][18][19].…”

“…This paper is an extension of work originally presented in TCSET-2020 [1]. Gallium and indium monoselenides (GaSe, InSe) are semiconductor compounds of the A III B VI group.…”

“…The levels of quadrupole energy in a solid substance arise when quadrupole moments interact with a non-uniform electric field at the location of the resonating nucleus, therefore the NQR spectrum reflects the distribution of electron density near a certain atom. Therein lies the uniqueness of the NQR method in the study of the fine features of the structure of chemical compounds [1].…”

“…Gallium and indium monoselenides (GaSe, InSe) are semiconductor compounds of the A III B VI group. They possess a number of interesting physical properties and a specific chemical structure which has sparked interest in them over the past half century [1][2][3][4][5][6][7]. The increased interest in these materials is caused by the possibilities of their application: in nonlinear optics, in solar energy converters, in high-sensitivity infrared optical sensors, in solid-state current sources and high-sensitivity pressure sensors.…”