Four common problems of ultrasonic transducers

Four common problems of ultrasonic transducers

If the ultrasonic vibrator is damp, you can use a megohmmeter to check the plug connected to the ultrasonic level transducer, and check the insulation resistance value to judge the basic situation. Generally, the insulation resistance is required to be greater than 5 megohms. If the insulation resistance value cannot be reached, the transducer is generally damp. You can put the whole transducer (excluding the plastic-sprayed casing) into an oven and set it at 100°C for 3 hours or use a hair dryer to remove moisture to the resistance value. so far.

The vibrator of the ultrasonic range transducer is ignited, and the ceramic material is broken. It can be checked with the naked eye and a megger. Generally, as an emergency measure, individual damaged vibrators can be disconnected without affecting the normal use of other vibrators. The vibrator is degummed. Our transducers are double-guaranteed by cementation and screw fastening. This situation will occur under normal circumstances.

The stainless steel vibrating surface is perforated. Generally, the vibrating surface of the transducer may be perforated after 10 years of full load use. The ultrasonic transducer is an energy conversion device. On the one hand, its function is to convert the input electrical power into mechanical power ) and then transmitted, on the other hand, it itself consumes a small part of the power.

Custom ultrasonic transducers can be divided into piezoelectric transducers, sandwich transducers, column transducers, inverted horn transducers, and so on. The structure of some single crystal materials has asymmetric characteristics. When these materials are subjected to external stress and generate strain, the change (deformation) of their internal lattice structure will destroy the original macroscopic state of electrical neutrality, resulting in a polarized electric field (electrical polarization), and the resulting electric field (electrical polarization) is proportional to the magnitude of the strain.

This phenomenon is called the positive piezoelectric effect, which was discovered by the Curie brothers in 1880. Then in 1881, it was further discovered that this type of single crystal material also has an inverse piezoelectric effect, that is, when a material with a positive piezoelectric effect is subjected to an external electric field, there will be stress and strain, and its strain is proportional to the magnitude of the external electric field. .

The piezoelectric effect is a characteristic of the crystal structure, which is related to the asymmetry of the crystal structure, and the magnitude and nature of the piezoelectric effect are related to the applied stress, or the relative direction of the electric field to the crystal axis. There are many types of single crystal materials with piezoelectric effect, commonly used such as natural quartz crystal, and artificial single crystal materials such as lithium sulfate, lithium niobate and so on.