SMALL DIGITAL VIBROMETER

Abstract

During scientific studies of the operation of ultrasonic equipment in modern technological processes, it is necessary to measure the amplitude of the mechanical vibration of the working tool, which at high frequencies has significant technical complexity. Knowing the magnitude of the amplitude of ultrasonic vibration makes it possible to precisely dose the amount of energy necessary to obtain a high-quality processing product, as well as for constant repeatability of the results of the equipment. Known foreign vibrometers are purposefully produced for specific conditions of use and are characterized by complexity, bulkiness and high cost, which is an obstacle to wide use. Therefore, the purpose of this work is to develop a low-cost, small-sized vibrometer for measuring the amplitude of ultrasonic emitters. For this, a capacitive measurement method with frequency modulation of the carrier frequency is used, which is characterized by high sensitivity and resistance to external interference. This vibrometer consists of two parts: a vibration sensor with an electronic converter of a high-frequency signal into a constant voltage proportional to the vibration amplitude, and a power supply unit and digital signal processing and indication of the amplitude in μm. The vibrometer sensor is mounted on a hinged tripod for ease of installation in any plane at a distance of ≈1 mm from the tested surface. The vibrometer is powered by a 220V network. The vibrometer is equipped with microprocessor processing and indication of the results of measurement of the vibration amplitude, as well as control and indication of the gap between the vibration sensor and the tested surface and stabilization of the amplitude readings when this gap varies within 0.7...1.2 mm. The vibration amplitude measurement range is 0...99 μm, with a resolution of 1 μm. The vibration frequency range is 5...50 kHz. The analog signal from the output of the vibrosensor can be used in the ultrasound generator feeding the piezoelectric transducer as a feedback signal to stabilize the amplitude of the mechanical vibrations of the emitter at the required level.