The application of ultrasonic waves and envelope energies in a closed chamber based on an air/methane mixture

This work proposes the experimental method of using a new matching layer (chemical wood) which can measure the methane gas of the main component in natural gas from a PZT (MS-21) of the most widely using BaTiO3. The experiment includes a differentiated analysis of envelope voltage, standard Gaussian distribution, acoustic pattern, and energy attenuation in a closed chamber according to an air/methane gas mixture. Experimental devices and methods were used to examine the characteristics of envelope energies via control models and transmission devices using a designed circuit, which could be fitted at resonance points of electrical signal change, frequency change, and pulse change to high sensitive ultrasonic sensors, for energy measurement regarding envelope, pattern, and attenuation. Signal analysis was used to verify the characteristics of transmission signal, voltage, shape, and frequency of the envelope which was measured factually by oscilloscope equipment. The experimental results were verified by a characteristic of acoustic energy whereby an ultrasonic sensor was diffused at minimal side energy from an λ2 sensor, while maintaining a value of θ at a minimum of 0.3 m, 18° and maximum of 1.5 m, 15° from the envelope energy pattern characteristics. Consequently, the matching layer material of general ultrasonic sensors has a significant weakness in not transferring a receiving signal that includes strength, permeability, and directivity of acoustic energy in a gaseous medium.