Electromagnetic Ultrasonic Thickness Gauge

Suitable for high-temperature testing.

With the country's investment and development in energy and power enterprises, various high-temperature and high-pressure pipelines are increasingly in demand.

As pressure pipelines for special equipment, any accidents can result in severe losses. In response, manufacturers of penetrating coating electromagnetic ultrasonic thickness gauges are required by national policies and regulations to conduct mandatory inspections to achieve a lower incidence of accidents.

This makes high-temperature and high-pressure pipeline inspection an urgent issue to address. Electromagnetic ultrasonic is a good choice for solving this problem. A significant advantage of electromagnetic ultrasonic over conventional ultrasonic is its non-contact nature.

The temperature field radiated by a hot body in space decays exponentially. The electromagnetic ultrasonic thickness gauge manufacturer notes that with each increase in distance from the probe to the surface of the test piece, there is a significant drop in the probe's ambient temperature. Therefore, electromagnetic ultrasonic can be used for high-temperature pipeline inspections.

Eddy Current Ultrasonic Thickness Gauge

Principle of Electromagnetic Ultrasonic Generation

Metal conductors in a variable magnetic field, manufacturers of electromagnetic ultrasonic thickness gauges for metal shells, will generate eddy currents internally. Simultaneously, due to the Lorentz force acting on any current in a magnetic field, and the metal medium producing stress waves under alternating stresses, stress waves within the ultrasonic frequency range are referred to as ultrasonic waves.

In contrast, manufacturers of pen-type electromagnetic ultrasonic thickness gauges, due to the reversible nature of this effect, the return sound pressure causes the vibration of particles under the influence of the magnetic field to also change the voltage at the ends of the eddy current coil. Therefore, it can be received and amplified by the receiving device and displayed. We call the ultrasonic waves excited and received in this manner electromagnetic ultrasonic.

In the aforementioned methods, the transducer is no longer merely a combination of an eddy current coil for transmitting alternating current and an external fixed magnetic field. The metal surface is an essential component of the transducer, and the conversion of electricity to sound is accomplished through the metal surface.

Electromagnetic ultrasound can only be generated on conductive media, thus its application is limited to conductive media.

Eddy Current Ultrasonic Thickness Gauge

When the magnetic field lines generated by the magnet are perpendicular to the metal surface, the eddy currents are subjected to forces parallel to the metal surface, causing particles to produce ultrasonic shear waves perpendicular to the acting force.

When the magnetic lines are parallel to the metal surface, eddy currents are subjected to repeated force actions perpendicular to the metal surface, resulting in ultrasonic longitudinal waves in the direction of the force.

If the high-frequency coil is shaped into a snake pattern, with the current directions of adjacent two winding sections opposite, and the spacing equal to half the wavelength, Rayleigh waves will be generated on the specimen surface. The excited ultrasonic signal is reflected and refracted at the surface of the tested piece, and the echo signals are received by the receiving instrument. The receiving principle is the inverse process of electromagnetic ultrasonic excitation, converting mechanical energy into electrical energy.

Utilize a supervisory computer to denoise and analyze echo signals, determine if the inspected workpiece has any defects, and achieve the detection process.

Penetrating Coating Ultrasonic Thickness Gauge Manufacturer - Beijing Han Gu - The electromagnetic ultrasonic thickness gauge manufacturer is provided by Beijing Han Gu Precision Instrument Co., Ltd. Beijing Han Gu Precision Instrument Co., Ltd. has invested a great deal of passion and enthusiasm in the field of instruments, components, and equipment. Beijing Han Gu has always been customer-centric, creating value for customers, and winning the market with quality and service. We sincerely hope to cooperate with all sectors of society to achieve success and create brilliance. For related business inquiries, please contact Manager Wang.