How to 3D Scan Large-scale Subway for Inspection

How to 3D Scan Large-scale Subway for Inspection

Sep 21, 2022

Do you need to inspect large-scale parts? Are you worried about low efficiency and poor measurement results? This case will share how a 3D scanner can help inspect large-scale subways.

Here are the highlights we would like to share with you

• Built-in Photogrammetry
• Infrared large-area scanning
• Accuracy up to 0.020 mm
• Instant and intuitive report

The inspection aims to ensure that a manufactured part meets a defined set of quality criteria or customer requirements. Manufacturers check and test parts by comparing them with original CAD models to determine whether a part conforms to the standards and specifications.

The inspection requirements for subway are becoming higher to ensure passengers’ safe traveling. Subways are large and feature curved surfaces.

When they are inspected with traditional methods, the process is usually time-consuming and the measurement results are of low quality. The introduction of 3D scanning can help to ease these pain points.

“We used to measure our parts manually. The measurement results are not good enough. The 3D scanner we use has built-in photogrammetry for measuring large-scale parts. It is portable and easy to use. I am impressed by its high accuracy, high efficiency, and intuitive reports.”

3D Inspection for Subway Car Body

The customer in this case needs a 3D scanner to collect 3D data on the subway car body. The company aims to measure the subway’s dimensions, such as its whole length and the length and width of doors and windows.

The measurement results are used to inspect whether the mounting holes in the windows and doors conform to the standard and to check whether they can be installed successfully.

Besides, the data can be stored and serve as a data basis for regular inspection and maintenance. After a user session, the subway may undergo variations that need to be inspected to check whether there are deformations or errors to ensure safe operation.

After 3D scanning the subway car body, engineers obtained the 3D data and compared them to the original model to check the deformation.

Thanks to the 3D software ScanViewer that goes with KSCAN-Magic, the manufacturer got an accurate and intuitive inspection report to guide the maintenance.

3D Scanner

KSCAN-Magic composite 3D Scanner for subway inspection

KSCAN-Magic composite 3D Scanner for subway inspection

Benefits of Scantech’s 3D Solution for Inspection

Built-in photogrammetry

Multi-functional 3D scanners to ensure precise results

We used KSCAN-Magic’s photogrammetry to ensure high-precision measurement results when measuring the subway as long as 20 meters.

Photogrammetry helps to capture the whole structure and serves as a basis for further detail scanning. It ensures the accuracy of data capturing and reduces alignment errors.

Built-in photogrammetry

Using Scantech’s photogrammetry system MSCAN-L15, you can also accurately obtain the targets (for spatial positioning) stuck on the car body.


Infrared Large-area Scanning

Fewer targets and high efficiency

The engineer used the infrared large-area scanning mode of KSCAN-Magic for scanning. It is one of the first 3D scanners that incorporate infrared laser into 3D scanning.

Thanks to its 1440 mm x 860 mm scanning area, fewer targets are needed, and scanning sessions are reduced, significantly increasing scanning efficiency.

Blue Laser Fine Scanning

Efficient and flexible, comprehensive data

KSCAN-Magic’s blue laser ultra-fine scanning mode was used for scanning details to present parts meticulously. It accurately obtained the details of grooves of the doors and windows with complete and comprehensive data, whose resolution is up to 0.010 mm.

Visual Inspection Report

Comprehensive analysis and visualization

After scanning the car body, the complete 3D data was imported into the 3D software to generate an intuitive visual inspection report, which was easy to read.

inspection report

Whether it is the inspection of subways, the structural section inspection of subway tunnels, or the automatic inspection of subway rails, 3D scanning performs well for vast applications in railway transportation.

Scantech provides 3D solutions, conforming to strict standards, for rail transportation. We provide accurate data for applications such as product development, virtual assembly, repeatability analysis, and traceability.

Click the link below to learn more about 3D solutions for rail transportation

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How to 3D Scan Large-scale Subway for Inspection


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