There are many areas where an ultrasonic transducer is needed, like in flaw detection, gauging thickness, material research, and medical diagnostics, the biomedical world, nondestructive application evaluations, as well as for penetration of think materials. It works through the principle of transformation of sound energy into electrical energy, and its reversal. It is capable of generating and pick the ultrasounds, which is how it can tell the distance. It comes with three main parts, and other smaller parts. These shall be the piezoelectric crystal, wear plate, and backing; acoustic matching layer; and the acoustic lens.
The piezoelectric crystal forms the heart of the gadget. It shall go through a series of rarefactions and compressions for it to convert electrical energy into ultrasonic energy, and vice versa. There shall be electrodes on both sides of the crystal. When a vibration originates from the outside of the crystal, it shall make a voltage out of it. The crystal is in the form of strips on which electrodes are affixed. A strip will have the size of a strand of hair. These are important in getting the unit to measure distance.
There is then a wear plate that keeps the crystal safe from harm. IT goes further and prevents corrosion, and wear and tear. It may also act as an acoustic transformer between water, wedge, crystal, or delay line.
There shall then be the backing materials, which has to be constructed from a materials that has the right density to help it do its attenuating work properly. It shall therefore absorb the energy radiating from the back of the crystal, which helps to keep the vibration in check. This unit will keep in check the vibration, resulting in the generation of ultrasonic waves that shall possess a shorter pulse length, thereby giving images that have the best possible resolution.
There is also the acoustic matching layer, which lies between the object and piezoelectric element. Its purpose is to ensure the element does not get reflected off a target, since there is a big difference in acoustic impendence between the object and piezoelectric element. The acoustic matching layer shall therefore see to it that the generated waves go into the object more efficiently. The layer is made from different resin materials that enable the device to have the right acoustic impendence value.
The acoustic lens forms the gray section that resembles a rubber fixed at the tip of the probe. When ultrasonic waves are transmitted from the probe, they shall spread and move rapidly. This lens shall control their spreading by getting them to focus, thereby giving a better image resolution.
You shall many brands, designs and styles for these devices. It is important that you get this device from a reputable and reliable manufacturer.