The Rise of SWIR Imaging in Industrial Inspection

Machine vision has always been about seeing what the human eye can’t catch fast enough, consistently enough, or accurately enough. But as industrial inspection becomes more advanced, visible-light imaging isn’t always enough.

That’s where SWIR imaging, or short-wave infrared imaging, is gaining attention.

By capturing wavelengths beyond the visible spectrum, SWIR imaging helps manufacturers and inspection teams reveal details that would otherwise stay hidden. From spotting defects to analyzing materials, this technology is quietly becoming a powerful tool for modern industrial automation.

What Is SWIR Imaging?

SWIR stands for short-wave infrared, typically referring to wavelengths outside the visible range. While traditional cameras capture what people can see, SWIR cameras capture light in a range that can reveal different material properties.

In practical terms, SWIR imaging can help detect contrast that isn’t visible under standard lighting. That makes it useful in applications where inspection depends on seeing through surfaces, identifying material differences, or detecting subtle flaws.

Why SWIR Is Gaining Momentum in Industrial Inspection

Industrial inspection is becoming more demanding. Manufacturers need faster throughput, higher accuracy, and more reliable quality control. At the same time, products and materials are becoming more complex.

SWIR imaging supports this shift by giving machine vision systems another layer of visual information. Instead of relying only on visible-light contrast, inspection systems can use SWIR to identify features that may be invisible to standard cameras.

SWIR imaging is particularly beneficial for various applications, such as:

• Material sorting, where different materials may look similar in visible light
• Moisture detection, where SWIR imaging can help reveal water content or contamination
• Semiconductor inspection, where precision and detail are critical
• Food and agriculture inspection, where internal quality and surface differences matter
• Packaging inspection, where visibility through certain materials can improve accuracy

In high-speed production environments, increased visibility can determine whether a defect is caught or missed.

SWIR and the Future of Smarter Automation

With the rise of interconnected factories, machine vision systems must evolve beyond image capture to provide essential visual data for smart, automated decision-making.

SWIR imaging fits naturally into this future. It gives systems access to more information, which can improve inspection confidence and reduce false rejects or missed defects. When paired with advanced sensors, lighting, and software, SWIR can help inspection systems become more adaptable and precise.

This complexity is one reason SWIR imaging is becoming more relevant in Industry 4.0 environments. Smarter factories need better data, and in machine vision, better data starts with better images.

The Lens Matters More Than Ever

While SWIR cameras and sensors get a lot of attention, the lens is just as important. Even the most advanced imaging sensor can only perform as well as the image it receives.

In SWIR applications, lens performance is critical because systems often need to work across visible and short-wave infrared wavelengths. If a lens introduces focus shift, distortion, or poor transmission, the inspection result can suffer.

A high-quality SWIR lens helps ensure the image stays sharp, consistent, and reliable across the required wavelength range. That’s essential for machine vision systems where accuracy directly impacts production quality.

Computar ViSWIR: Built for Visible + SWIR Imaging

Computar’s ViSWIR series is engineered for the latest visible and SWIR imaging sensors, including Sony Semiconductor Solutions Corporation’s IMX990/991 sensors. The series covers the spectrum from visible light to the SWIR band ( 800–1700 nm), helping machine vision systems capture clear images across multiple bands.

The ViSWIR Hyper APO Series is engineered for broadband use and achieves high transmittance and high resolution without focus shifting across multiple bands. Its APO floating design helps reduce focus shift at different wavelengths and working distances, making it a strong fit for demanding machine vision, UAV, and remote sensing applications.

For applications that need clear imaging from visible to SWIR in a more streamlined solution, the ViSWIR Lite Series uses multilayer coating and a hyper-wideband AR coat to achieve high transmittance from 400–1700 nm.

As SWIR imaging continues to expand in industrial inspection, choosing the right lens will be essential. The sensor may capture the data, but the lens determines the quality of what reaches it.

Contact us for more information on SWIR imaging, Computar’s ViSWIR series, and help choosing the right lens for your application.

Resources:

1. https://www.photonics.com/Articles/SWIR-Imaging-An-Industrial-Processing-Tool/a25134
2. https://www.automate.org/vision/tech-papers/why-use-swir-imaging
3. https://www.computar.com/blog/beyond-visible-how-swir-viswir-lenses-unlockhidden-signals-for-machine-vision
4. https://www.computar.com/viswir