FLOW RATE MEASUREMENT METHOD, ULTRASONIC FLOW RATE METER, FLOW VELOCITY MEASUREMENT METHOD, TEMPERATURE OR PRESSURE MEASUREMENT METHOD, ULTRASONIC THERMOMETER AND ULTRASONIC PRESSURE GAGE

摘要

Using a frequency phase difference is zero and provides a flow rate measuring method, and ultrasonic flow meters in accuracy can be satisfactorily measure the flow rate of the fluid. ; Preparing an ultrasonic velocity of the standard state that is the basis for the fluid, the fluid flowing from within the tubular body (10) and transmitting the ultrasonic wave from the one side, receives the ultrasonic wave from the other, and measuring the ultrasonic velocity A at that time. Flowing fluid from within the tubular body and emitting a ultrasonic wave from the other side, receiving the ultrasonic wave from one side, and measuring the ultrasonic velocity B at that time. By calculating a mean value of the ultrasonic velocity A and the ultrasonic velocity B detect the absolute velocity of the ultrasonic waves in the fluid, and by dividing the difference between the ultrasonic velocity A and the ultrasonic velocity B by 2, detecting the velocity V of the fluid, and wherein the standard conditions by correction of the velocity V from the ultrasound speed and the deviation of the absolute velocity, detecting an accurate flow rate of the fluid, and measuring the flow rate of the fluid from the cross-sectional area within the tube and the correct flow rate. ; Flow measurement, flow rate measurement, temperature measurement, pressure measurement, ultrasonic flowmeters, ultrasonic, temperature and pressure gauges.