This paper proposes a method based on the phased parametric array to solve the problem of the orientation of infrasonic waves in the air. Firstly, the principles and models of the phased parametric array are introduced, and the models are analyzed via simulation, thus proving that this orientation method can generate infrasonic waves with good directivity. At the same time, the Doyle-Chebyshev beam control method is used to suppress the sidelobes and concentrate the generated infrasonic waves in the direction of the main axis. Finally, the important parameter, namely the infrasonic wave array length, is analyzed to find out at which length the infrasound source level reaches the approximate peak. Through comparison, it is found that the actual array length is smaller than the effective array length.
KEYWORDS: Temperature sensors, Control systems, Telecommunications, Analytical research, Sensors, Reliability, Time metrology, Temperature metrology, Signal generators, Information operations
Aiming at the problem of insufficient durability testing of thermal energy meters, a durability testing and quality analysis platform with complete functions and high degree of automation is developed and designed. In order to verify the monitoring accuracy and stability of the platform system, the performance test and quality analysis were carried out for the real-time performance of the platform system, the repeatability and reproducibility of the measurement system, and the effectiveness analysis are conducted according to the judgment criteria to ensure the safety and reliability of the platform system and meet the performance and quality requirements of the heat meter.
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