measurement accuracy and provide color-independent object detection, immunity to dust, and operation up to +70°C. They measure distances based on time-of-flight technology where the distance is equal to the speed of sound multiplied by the total acoustic time of flight (t 2 ) with the total divided by 2 (Figure 6). Ultrasonic sensors like model UM30-212111 are suited for applications like empty tote monitoring. An internal temperature monitor produces a measurement accuracy of ±1%. These color- independent sensors can detect hard to distinguish objects even in the presence of dirt and dust. Conclusion The good news is that there’s a wide range of proximity and distance sensor technology choices. That means there’s a solution for every application requirement. The challenge is sorting through the many choices and finding the optimal solution for detection of specific materials under actual application and operating conditions.
Figure 7: Ultrasonic sensors can measure distance based on the total time of flight (t 2 ) of the sound waves. (Image source: SICK)
we get technical
25
Powered by FlippingBook