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​​What is Ultrasonic C Scan Visualization?

In this blog post, you’ll read:The ultrasonic C scan is one of the best methods of inspecting flaws on large surfaces. The ultrasonic flaw detectors use the A-scan data to create a C-scan map

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Achieving accurate results out of your ultrasonic scanner can come in handy when inspecting flaws in machine parts. This is where the ultrasonic C scan visualization comes in. One of the most important techniques for mapping and analyzing the output of an ultrasonic flaw detector is the ultrasonic C scan visualization.It represents a three dimensional model of the tested material plotted horizontally and vertically to reveal a visual degradation map of the material. In this article, you will learn C-scan visualization and how it can help you get the most out of your ultrasonic testing.


I. What is Ultrasonic C Scan?

The ultrasonic C scan is one of the best methods of inspecting flaws on large surfaces. The ultrasonic flaw detectors use the A-scan data to create a C-scan map that is three-dimensional. The C-scan map uses pixels to interpret the A-scan data, with each pixel representing the amplitude of waves recorded in the A-scan. With the C scan data, you can easily analyze the flaws and defects present in the test material. Using the C scan visualization effectively analyzes the integrity of parts and test materials over three-dimensional planes. The depth of the ultrasonic penetration is measured by the height of the diffraction pattern which appears on the screen and can be either bright or dark. A bright image means little change in thickness, and vice versa for dark images. Two parameters indicate whether the defect is deep or shallow. These are depth of penetration and diameter spreads.


II. What is Ultrasonic B Scan?


The ultrasonic B scan is an important parameter for evaluating materials’ internal quality. This is a two-dimensional view of the cross-section of the material being inspected. 

The B scan shows the thickness of the material over different positions measured at different times. You can adjust the time and time intervals of the B scan according to the ultrasonic testing standards.

The B scan shows different values depending on the material being tested. It also shows data based on the material’s thickness, density, and acoustic impedance. The B scan is useful for examining the material to determine penetration depth. You can achieve this by looking at the cross-section of the material in B scan mode.


III. What is Ultrasonic A Scan?


The ultrasonic A scan, also known as the amplitude scan, is the basic representation of waves as they pass from the ultrasonic detector to the test material. The A scan appears as a one-dimension graphical representation of amplitude as a function of time. You can use it to identify resonances and other defects in the material. The A scan is the simplest and most basic way of measuring the strength of the material and can also be used to find air gaps and other defects, such as defects in depths. From the data collected from A scan, you can create other scans, such as the B and C scans, to get a bigger picture of the defects in the test material.


IV. What is the theory of Ultrasonic C Scan Visualization (C-Scan Ultrasonic Visualization Mechanism)?

Ultrasonic C Scan Visualization
source: @geckorobotics

The visualization of the ultrasonic C scan is a very effective technique for locating flaws and corrosion in materials. A transducer sends ultrasonic pulses during an inspection, and the results are then analyzed. The data collected can be displayed in various forms, such as the A scan, B scan, or C scan. The C scan shows a 3D model of the ultrasonic waves which includes the amplitude and depth of the waves. In contrast, the other scans represent the data in a 2 dimension grid plot. This method improves the accuracy of flaw detection in the test materials because data is shown in high resolution and different color patterns.

The C scan ultrasonic flaw detection can be done based on the amplitude and depth of the material.

Depth-based testing: In depth-based testing, a transducer sends ultrasonic waves into the material and records the backscattered waves. The amplitude of the waves is then analyzed to measure distance in terms of thickness. The thickness measured by this method can vary depending on the machine settings and materials used. Different color codes represent the depth measurement called depth maps. 

Amplitude-based testing: Amplitude-based testing is another method for flaw detection in the material using a transducer. In this method, the amplitude of the waves is analyzed as they pass through the material. The amplitude of the waves decreases as they pass through materials; this information is used to observe the material’s behavior. Amplitude-based scans can measure and spot weaknesses in welds and other materials with inconsistencies.


V. How to use Ultrasonic C Scan Visualization to improve inspection efficiency?


This method is one of the most effective methods by which the inner dimensional strength of materials can be checked.

  • With C scan visualization, you can detect the position and depth of the defects. This can be hard to detect using normal visual inspection.
  • You can test materials with different properties and identify the pattern of flaws.
  • Multiple flaws can be identified in a single test.


With C scan visualization, you can save time and money when performing ultrasonic testing as you need to check many samples rather than just one with a visual inspection. You also improve the accuracy and speed of ultrasonic testing. The method uses advanced probes and software to inspect and analyze the test materials quickly and accurately, saving a lot of time. Firms can use this downtime to increase productivity in other fields.

The C scan visualization is completely different from the traditional method in which an inspector needs to do a visual inspection of every sample checked and then make a conclusion based on his observation. In the C scan visualization, inspectors save time as they only need to observe small samples for a few seconds and then make a conclusion about that sample.


VI. How to use Ultrasonic C Scan Visualization for Enhanced Analysis?


Ultrasonic C scan visualization provides an efficient way of inspection and analysis. The C scan visualization method is used to evaluate the internal quality of materials. You can use this method to map out, detect and observe changes in materials from the outside. The C scan visualization is very useful in many fields because it can provide accurate results in depth, amplitude, and phase images of inconsistencies and reveal weak spots inside materials. 

The C scan visualization also plays a crucial role in detecting defects. Since defects can be detected through the C-scan visualization, it becomes important to identify the defect type and its position. When flaws are identified, you can measure them accurately to estimate the materials’ strength. 

The ultrasonic flaw scanning helps provide reliable results and improve inspection efficiency at a high level when compared with its visual counterpart.

C scan visual inspection is one of the most effective ways to identify inaccessible parts of the material. C-scan visualization also provides an effective method for identifying and assessing the extent of corrosion.



Ultrasonic flaw detection can be used in various industries and materials. Ultrasonic testing is an advanced method of inspection which uses the process of transducing sound waves into a material and then interpreting the waves for flaw detection. The C scan ultrasonic visualization is a very efficient method for flaw detection and corrosion mapping in materials. With the C-scan ultrasonic visualization, you can detect the position and intensity of flaws. You, thus, can identify the patterns and types of flaws in various materials whose properties are different. The C scan visualization also helps detect material flaws, which are generally hard to detect by visual inspections or traditional methods.

Ultrasonic flaw detection forms the basis of an acceptable inspection system for many industries, including aerospace, automotive, mining, and railways.

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