Apparatus for measuring average particle size of steel plate using ultrasonic backscattering and measuring method using the same

摘要

The present invention relates to an apparatus for measuring the average particle size of a steel sheet using ultrasonic backscattering and to a method for measuring the average grain size (average grain size) of stainless steel cold rolled steel sheet on-line using ultrasonic waves,;The steel plate 16 passes through the water tank 17a which is supplied with water to maintain a constant water level; The ultrasonic transducer 13 installed inside the water tank 17a to be immersed in water receives a high voltage pulse wave from the pulse transmitter 11 and scans the ultrasonic wave to the steel sheet 16 using water as a contact medium; The ultrasonic transducer 13 receives the ultrasonic wave scattered back by the steel plate 16 and sends the ultrasonic wave to the pulse transmitter 11; Amplifying the pulse signal received from the pulse transmitter (11) by the signal amplifier (14) and sending it to the calculation unit (15); The calculation unit 15 is configured to convert the measured signal into an energy value by a program input in advance to calculate and output the average particle size of the steel sheet 16,;Ultrasonic waves are incident on the stainless steel cold rolled steel sheet and the Rayleigh critical angle, and the energy of the reflected signal is calculated. Therefore, the average grain size of the cold rolled steel sheet can be measured online.