Ilnytska T. Scientific and technical principles of the development of the measurement standard of ultrasound power unit in water medium

. Ultrasound power measurement methods and the current state of metrological assurance of measurement of acoustic variables in the ultrasonic frequency range both in Ukraine and abroad have been analyzed. The theoretical research of propagation of high frequency ultrasound in water medium has been conducted. The mathematical model of measurement during the realization of ultrasound power unit emitted into the water medium has been improved. The Procedure for Uncertainty Management has been improved and applied for the first time and at an early stage of development of the measurement standard of ultrasound power unit. The new adaptive method of construction of the measurement standards of measured variables with specified characteristics of accuracy in conditions of limited resources has been developed and implemented. Experimental research has been conducted to determine the metrological characteristics of established measurement standard. Monte Carlo method for evaluation uncertainty of measurement of the measurement standard has been applied and application program for its implementation has been developed. The measurement standard of ultrasound power unit in water medium has been created and enacted. The verification scheme for measurement of ultrasound power in water medium, the method of meteorological attestation of measurement standard, the method of calibration of ultrasonic transducers, and the method of verification of ultrasonic power meter have been developed.