Energy efficiency increase of NQR spectrometer transmitter at pulse resonance excitation with noise signals

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

“…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].…”

“…The application of the developed methods of NQR pulsed radio spectroscopy made it possible to increase spectral resolution, improve spectral shape and significantly reduce the time of research. In the case of studying InSe and GaSe crystals, spectra with SNR values of 41.9 dB were observed in samples with a volume of 0.1 cm 3 [14]. The total time of observation of each NQR spectrum and the calculation of the FFT was about 10 s. To improve the SNR, an averaging of 128 iterations was used.…”

High power LDMOS radio frequency transmitter for NQR experiments

“…The latter leads to increased requirements for the radio frequency transmitter of the NQR radio spectrometer, in particular, an increase in its efficiency, increased reliability and energy characteristics, which is especially important in a portable version of the design 5 . This paper presents an improved solution of the radio frequency transmitter of the NQR pulse spectrometer 6 . The device is made in the form of a separate functional module, which consists of a driver, an output amplification stage on a specialized LDMOS BLF188XR, a high-pass filter, power supply and protection circuits 7 .…”

Synthesis of the configuration structure of digital receiver of NQR radiospectrometer

“…The study of physical properties of substances using pulsed electromagnetic radiation has become widespread in optical and radio wave spectroscopy. Pulsed Fourier spectroscopy of nuclear quadrupole resonance (NQR) is based on powerful radio frequency excitation pulses and the use of highly sensitive equipment [1][2][3]. In response to the short broadband δ-pulse, this method ensures the excitation of all resonance frequencies of the NQR spectrum.…”