플렉스 센서 유량계 및 차압형 유량계의 동적 반응 특성 비교 연구

When force is applied to a flex sensor, it undergoes bending deformation, leading to a change in its internal resistance. A flowmeter was developed using these characteristics of the flex sensor. To induce dynamic flow conditions, two butterfly valves capable of controlling the flow direction were installed. A flex sensor was installed by protruding it into a pipe through which fluid flows. To compare the dynamic response characteristics of a flex sensor flowmeter and an average Pitot (APT) flowmeter, which is a differential pressure flowmeter, they were installed in series. The dynamic response times of the flex sensor and APT flowmeters were obtained by measuring the voltage signal output from the sensors. When increasing the flow rate in the pipe from zero to its maximum, the dynamic response time was defined as the time taken by the sensor output to reach 63% of its maximum value. Prior to analyzing the sensor output signal, noise was eliminated using the OriginPro Savitzky-Golay method. The average dynamic response times of the flex sensor and APT flowmeters were 0.06 s and 0.16 s, respectively.