METHOD FOR GENERATING AND CONTROLLING HIGH-FREQUENCY PULSES FOR RECORDING DOUBLE ELECTRON-NUCLEAR RESONANCE SPECTRA Russian patent published in 2024 - IPC G01N24/12 G01R33/62 

FIELD: radio engineering.

SUBSTANCE: invention can be used for the formation of radio pulses in magnetic resonance spectroscopy, in particular in double electron-nuclear resonance, for the study and analysis of materials. The inventive method for generating and controlling high-frequency pulses for recording double electron-nuclear resonance spectra using a high-frequency pulse control module, consisting of a microcontroller and an RF switch, includes: the formation of rectangular pulses by a spectrometer programmer with a given duration at given times to create microwave pulses; formation of a triggering rectangular pulse by the spectrometer programmer between the intended microwave pulses with a given duration at a given time to create an RF pulse and feed it to the microcontroller of the high-frequency pulse control module; generation of a code by the microcontroller program to set the generator frequency; reading by a code generator to set a given frequency; generating a harmonic signal in the generator and feeding it to the RF switch of the high-frequency pulse control module; formation by the microcontroller of a rectangular pulse with a given duration to modulate the harmonic RF signal passing through the RF switch; modulation of the harmonic signal received from the generator with a rectangular pulse from the microcontroller in order to form an RF pulse and send it to the RF power amplifier; supplying an amplified RF pulse to the resonator coil (location of the sample under study) of the EPR spectrometer; registration of the first point of the double electron-nuclear resonance spectrum, obtained by simultaneous exposure of the sample to both microwave and HF pulses and detection of the microwave response; repeated repetition of the above procedures to obtain the full spectrum of double electron-nuclear resonance, with the only difference that in each new repetition cycle the microcontroller generates a new code to set the generator frequency with a given step until the final frequency of the RF pulses is reached.

EFFECT: recording of identical double electron-nuclear resonance spectra in EPR spectrometers that are not equipped with a special complex for taking double electron-nuclear resonance due to the design of a simple, universal and inexpensive module for generating and controlling high-frequency pulses for double electron-nuclear resonance and coordinating the operation of the specified software module, which allows expanding the capabilities of the EPR spectrometer.

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