If you ever watched a deep sea diving documentary, you might have wondered how researchers can tell the depth of water without actually getting into it. For those who do not already know, this is done with the help of distance sensors. Generally, distance sensors are non-contact devices. There are different kinds of distance sensors that use different technologies. These include infrared, laser and ultrasonic technologies. Over the last few years, most distance sensors have been using ultrasonic technology to determine distances between the devices and their targets.
How do ultrasonic distance sensors work?
The functioning of ultrasonic distance sensors is very simple and can be related to the way bats fly. These devices send out ultrasonic pulses and then listen for returning echoes. These echoes are reflected off the target. Distance measurements are obtained from the time of transmission until the echo returns. Most distance sensors can also pick up targets that are small or even those which are very absorptive to sounds. Distance sensors are also capable of measuring multiple targets.
In certain instances, an independent measurement may be required for compensating the distance readings of distance sensors. This becomes necessary because the speed of sound in air differs with temperature. For this purpose, a simple calculation is used along with the initial reading and this helps to get a precise distance reading.
Like other sensors, there are different types of distance sensors and these are used for various applications. The most common applications in which distance sensors are used are measuring water levels and snow depths. Due to their applications, distance sensors have to be designed to meet the most stringent conditions.
