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What Is Ultrasonic Thickness Gauge?

Aug. 26, 2021

Ultrasonic thickness gauges are a widely used non-destructive testing technique for measuring the thickness of materials from one side. It is fast, reliable, and versatile, and unlike micrometers or calipers, it requires contact with only one side of the specimen. The first commercially available ultrasonic gauges using a principle derived from sonar were introduced in the late 1940s. Small, portable instruments optimized for a variety of testing applications became commonplace in the 1970s. Later advances in microprocessor technology brought new levels of performance to today's sophisticated, easy-to-use miniature instruments.


Why is ultrasonic testing used?

In many industries, ultrasonic thickness measurements are critical for monitoring corrosion, erosion, and damage. Ultrasonic thickness measurement (UTM) is a commonly used method that can be applied to a wide range of structures and components, including ship hulls, pipelines, pressure vessels, and structural steel.  


Detecting metal loss due to corrosion, erosion or damage is essential to ensure the continued safety and operation of the item/structure being inspected. It can also help determine if repairs or replacements are needed, or if the item/structure should be decommissioned. Ultrasonic thickness measurement data provides the customer with the necessary information to determine if the item being inspected has the adequate metal thickness for which it was designed.


HS F91 Electromagnetic Ultrasonic Thickness Gauge

 HS F91 Electromagnetic Ultrasonic Thickness Gauge

Types of Ultrasonic Thickness Gauge

Commercial ultrasonic thickness gauges are generally divided into two types: corrosion gauges and precision thickness gauges. One of the most important applications of ultrasonic gauging is the measurement of the remaining wall thickness of metal pipes, tanks, structural components, and pressure vessels that are subject to internal corrosion that is not visible from the outside. Designed for this type of measurement, corrosion gauges use signal processing techniques optimized for detecting the minimum remaining thickness in rough, corroded specimens and use specialized bicrystal sensors for this purpose.


Precision gauges using single-crystal sensors are recommended for all other applications, including smooth metals as well as plastics, fiberglass, composites, rubber, and ceramics. With a wide range of sensors available, precision gauges are very versatile and in many cases can measure to +/- 0.001" (0.025 mm) or better than what can be achieved with corrosion gauges.

HS F91 electromagnetic ultrasonic thickness gauge is a new type of portable electromagnetic ultrasonic thickness gauge that uses an EMAT probe to detect any metal or magnetic material.


The instrument does not need couplant when working, has fast detection speed and good repeatability, and can be used for high-temperature workpieces (up to 600°). The probe is not in direct contact with the measured object and has the function of automatic high-temperature sound velocity compensation. It is suitable for the detection of materials with rough surfaces and coating (paint, rust, etc.) on the surface.


Where is ultrasonic testing used?

Almost any common engineering material can be measured ultrasonically. Ultrasonic thickness gauges can be set up for metals, plastics, composites, fiberglass, ceramics, and glass. In-line or in-process measurements of extruded plastics and rolled metals are often possible, as is the measurement of individual layers or coatings in multi-layer manufacturing. Liquid levels and biological samples can also be measured. Ultrasonic measurements are always completely non-destructive and do not require cutting or slicing.

Materials that are usually not suitable for conventional ultrasonic measurements include wood, paper, concrete, and foam products due to poor transmission of high-frequency sound waves.

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Wuhan Zhongke Innovation Technology Co., Ltd., is a scientific and technological enterprise and a nondestructive testing equipment manufacturer with independent intellectual property rights. Zhongke Innovation has been committed to providing the market users with various kinds of all-around, efficient, steady, reliable, safe, and environment-friendly nondestructive testing solutions and products.

In 1988, Zhongke Innovation adhered to the business concept of “Leading Technology, Integrity-based, High Quality and Efficiency, Progressive Innovation” to take the lead in independently researching, developing, and manufacturing China's first digital ultrasonic testing equipment. 

Let us help you find the best nondestructive testing solutions for your project. When you contact us, please provide your detailed requirements. That will help us give you a valid quotation.


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