An application of membrane sensors in hydrolocation systems using digital laser interferometers

• Дата: 2019
• Автори: Britsky, A. I., Tokalin, О. A.
• Формат: Стаття
• Мова: rus
• Опубліковано: Інститут проблем реєстрації інформації НАН України 2019
• Теми: цифровий лазерний інтерферометр; «товстий» мембранний датчик; частотні характеристики; digital laser interferometer; «thick» membrane sensor; frequency characteristics
• Онлайн доступ: http://drsp.ipri.kiev.ua/article/view/199392
• Назва журналу: Data Recording, Storage & Processing

The results of theoretical studies of forced oscillations of a «thick» disk are presented with the aim of using it as a membrane sensor for a receiver of ultrasonic sonar signals for sonar systems based on digital laser interferometers. By an external action on a disk that is rigidly fixed around the circumference, it is meant that the total constant pressure of water and the variable pressure of the hydroacoustic signal carried by infrasound waves. To describe the oscillations of the disk membrane, a simple model is considered in the form of a wave equation for a neutral surface in the middle of the disk, the equilibrium of which is described by a fourth-order differential two-dimensional operator. In this model, the influence of the thickness of the disk is taken into account using the elastic parameter — cylindrical stiffness. Using the Fourier transform of the wave equation in time variable for a monochromatic acoustic signal, a general solution to the equation is found. The classical transfer function of the considered sensor model is obtained as a reaction to a monochromatic external action in the form of the amplitude of the forced oscillations of the disk in its central region, the natural vibration frequencies are determined depending on the size and elastic properties of the disk materials, and the frequency characteristics of the model are calculated. In the area of infrasonic frequencies to be much lower than the fundamental frequency of the disk’s own vibrations (first resonance), the amplitude-frequency characteristic is well approximated by a power function with an exponent of –2 and significantly exceeds the sensitivity of the sensor in the region between the resonance frequencies. Fig.: 3. Refs: 8 titles.