| 摘要 |
<p>The invention provides an ultrasonic flowmeter formed by three ultrasonic sensors, two microcontrollers PIC and ARM, three temperature sensors, a clock with configurable GSM/GPRS, a MMC/SD card, a GLCD screen, a numeric keyboard and a power source. This device allows the flow to be measured by determining the sound speed and time used for travelling a distance.</p> |
