Ultrasonic transducers or ultrasonic sensors are a type of acoustic sensor divided into three broad categories: transmitters, receivers and transceivers. (Wikipedia)
Ultrasonic transducers are needed to be able to use ultrasonic waves in taking measurements. Human ears cannot detect the sounds produced by ultrasonic waves because they have very high frequencies. The frequencies of these sounds are over the maximum frequency that humans can hear, which is 20kHz. Sound waves travel at various speeds, depending on factors such as the kind of medium they are traveling through and the conditions of the atmosphere. In general, ultrasonic transducers have a receiver and a transmitter.
To be able to take the proper measurements, you should have the right kind of transducer. In choosing a transducer, there are several factors that you should consider. These factors include the medium that the sound waves will travel through, the mounting configuration, the needed width of the beam, and the maximum distance that the sound waves will cover. Aside from transducer, you also need a timer.
Once you have the ultrasonic transducer and timer ready, do the following:
- Choose a medium. At one end of that medium, put the transmitter.
- Put the receiver at the other end. There are instances that the receiver and transmitter have to be positioned side by side. One example is when the sound waves reflect off a surface.
- After you have positioned the ultrasonic transmitter and receiver, get the timer. Use this timer to know how long it will take the waves to go from the transmitter to the receiver.
- Set your timer depending on the parameters that you will measure. You can measure how many waves pass from the transmitter to the receiver per second or how fast the ultrasonic waves travel through the medium.
Ultrasonic transducers are really valuable instruments. They are important not only in the fields of industry and research, but also in the field of medicine. Transducers are used in scanning bodies of human. There are various sizes and shapes of transducers and the size and shape that should be used will depend on the task that will be handled.