Singularities of anisotropy of acoustic attenuation in paratellurite crystals

Akhmedzhanov, Farkhad; Mirzaev, S. Z.; Saidvaliev, U.A.

doi:10.1121/2.0000937

Cited by 4 publications

(2 citation statements)

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“…Now let's assume that the duration of the elastic wave packet is much less than τ 0 , i. e. τ i << τ 0 . Under these conditions, the voltage at the output of the PМТ, determined by equation ( 25), is formed due to the component, which is determined by equation (23). At the same time, the contributions of the components determined by equations ( 22) and ( 24) become negligibly small.…”

Section: Methodsmentioning

confidence: 99%

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Development of an axonometric model of photoelastic interaction in an acousto-optic delay line and its approbation

Гасанов

Hasanov

Rustamov

et al. 2022

TAPR

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The object of research is a mathematical model of the photoelastic interaction in an acousto-optic delay line (AODL). Two possible cases are discussed as applied to the ratio of the input pulse duration to the time of crossing the optical beam by an elastic wave packet. It is shown that in both cases the voltage at the output of the device is found as the sum of three components, which are formed by different mechanisms. If the duration of the input pulse is longer than the time of crossing the optical beam by an elastic wave packet, then the first component is determined by the process of entry of the leading edge of the elastic wave packet into the optical beam, the second – by the process of complete interaction of the optical beam with the elastic wave packet, and the third – by the process of exit of the trailing edge of the elastic wave packet from the optical beam. In the second case, i. e. when the duration of the input pulse is less than the time of crossing the optical beam by an elastic wave packet, the first term is determined by the process of entry of the elastic wave packet into the optical beam, the second – by the process of advancing the elastic wave packet in the aperture of the optical beam, and the third – by the process of exit of the elastic wave packet from the aperture of the optical beam. The corresponding equations for calculating the parameters of the output pulse were obtained by applying a rectangular pulse to the AODL input. It is proved that if the pulse duration at the AODL input is longer than the time of intersection of the optical beam by an elastic wave packet, then the pulse duration at its output will be equal to the duration of the input pulse. In the case when the duration of the input pulse is less than the time of crossing the optical beam by an elastic wave packet, the duration of the output pulse will be determined by the time of propagation of the elastic wave packet in the aperture of the optical beam. The obtained equations are confirmed by numerical calculations. The results of the numerical analysis were tested experimentally, which confirms the unequivocal adequacy of the proposed model of photoelastic interaction in an AODL.

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Section: Methodsmentioning

confidence: 99%

“…Since, the speed of transverse waves in these materials is approximately 616 m/s. However, it should be taken into account that these materials exhibit anisotropy [23].…”

Section: Methodsmentioning

confidence: 99%

Development of an axonometric model of photoelastic interaction in an acousto-optic delay line and its approbation

Гасанов

Hasanov

Rustamov

et al. 2022

TAPR

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Широкосмуговий Акустооптичний Амплітудний Демодулятор

Гасанов,

Рустамов

et al. 2023

Известия вузов. Радиоэлектроника

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Обоснована научно-практическая значимость синтеза демодуляторов в решении задачи мониторинга неизвестных радиоизлучений. Особенности фотоупругого эффекта обсуждаются в контексте построения амплитудного демодулятора. Составлена математическая модель процесса формирования сигнала на выходе демодулятора. Показано, что выходной сигнал является точной копией информации, содержащейся в радиосигнале на входе. Отмечается, что амплитудный демодулятор выполняет также функцию фильтра нижних частот с характерной частотой среза. Обсуждается метод расчета частоты среза демодулятора на основе переходной характеристики. Создан лабораторный образец акустооптического амплитудного демодулятора на основе ячейки Брэгга с центральной частотой 80МГц. Для проверки установленных положений был проведен ряд экспериментальных исследований. Рассмотрены процессы демодуляции сигналов с амплитудной и импульсной модуляцией. Проведен сравнительный анализ модулирующего сигнала и сигнала на выходе демодулятора. Показано, что акустооптический амплитудный демодулятор воспроизводит информацию с достаточной для практики точностью. Приведен пример определения частоты среза акустооптического амплитудного демодулятора по форме выходного импульса.

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Broadband Acousto-optic Amplitude Demodulator

Gasanov,

Rustamov

et al. 2023

Radioelectron.Commun.Syst.

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Singularities of anisotropy of acoustic attenuation in paratellurite crystals

Cited by 4 publications

References 0 publications

Development of an axonometric model of photoelastic interaction in an acousto-optic delay line and its approbation

Development of an axonometric model of photoelastic interaction in an acousto-optic delay line and its approbation

Широкосмуговий Акустооптичний Амплітудний Демодулятор

Broadband Acousto-optic Amplitude Demodulator

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