CMM (Coordinate Measuring Machine)
White, Blue, and Violet Light Handheld Scanners; What should you choose?
3D handheld scanning has been at the forefront of the metrology world for the last few decades, and recently has been making significant strides to get even better. While various types of scanners exist, the illumination source—be it white, blue, or violet light—plays a critical role in determining a handheld scanner's precision, efficiency, and versatility. This article dives into the characteristics of each light type, highlighting their strengths and limitations, and ultimately showcasing why advances in violet light scanning, particularly with the KEYENCE WM-6000 Series, might be the best option for you!
White Light Handheld Scanners: The Traditional Approach
White light handheld scanners operate by projecting a broad spectrum of light patterns onto an object. A camera then captures the distorted patterns, and software calculates the 3D coordinates of each point.
Advantages:
- Reliability: With the right setup, you can scan most materials and finishes very easily and consistently.
- Cost-Effective: Often a more budget-friendly option for general 3D scanning needs due to the lower cost of white light scanners.
Limitations:
- Sensitivity to Ambient Light: Performance can be significantly impacted by surrounding light, requiring controlled environments or enclosures.
- Surface Reflectivity: Highly reflective or transparent surfaces can be challenging to scan accurately without pre-treatment with spray or stickers.
- Accuracy: While good for general purpose, white light typically offers lower precision compared to blue and violet light.
Blue Light Handheld Scanners: Enhanced Precision
Blue light handheld scanners utilize a narrow band of blue light, which is less susceptible to interference from ambient light compared to white light. This monochromatic approach allows for improved signal-to-noise ratio and often higher accuracy.
Advantages:
- Reduced Ambient Light Interference: More robust in varied lighting conditions.
- Improved Accuracy: Generally, provides higher precision than white light systems, making them suitable for more demanding applications.
- Detail Capture: Better at capturing fine details due to the shorter wavelength.
Limitations:
- Surface Challenges: While better than white light, very dark, highly reflective, or extremely thin surfaces can still present scanning difficulties that require spray and/or stickers
- Slower Scan Speeds: Can sometimes be slower than advanced violet light systems due to processing requirements.
Violet Light Handheld Scanners: The Best of Both Worlds
Violet light scanners, with an even shorter wavelength than blue light, represent the cutting edge in optical 3D measurement. This technology offers unparalleled precision, stability, and adaptability, making it the ideal choice for even the most challenging industrial applications.
Advantages:
- Superior Accuracy and Resolution: The shorter wavelength allows for the capture of extremely fine details and delivers the highest level of accuracy, crucial for tight tolerances and intricate parts.
- Exceptional Performance on Challenging Surfaces: Violet light is highly effective at scanning a broader range of material types, including very dark, highly reflective, and even translucent surfaces, often eliminating the need for spray or pre-treatment with stickers.
- Minimal Ambient Light Interference: Its specific wavelength makes it exceptionally resilient to ambient light, ensuring consistent and reliable measurements in various environments, from shop floors to laboratories.
- Enhanced Stability: The combination of a stable light source and advanced algorithms ensures highly repeatable results.
- Fast Data Acquisition: Modern violet light systems are designed for rapid scanning, significantly reducing inspection times and improving throughput.
Limitations:
- Excessive Data: While this may not be an issue in most use cases, since it can pick up on most materials and surfaces, it may give you more data than you are looking for. That said, it is very easy to remove this data.
Spray and Stickers
As mentioned earlier, white and blue light scanners often have to utilize spray and/or stickers to be able to scan different surfaces or finishes. This chalk-based spray makes an otherwise shiny object, matte white, which helps the scanner pick up on its geometry. It rarely causes issues with smaller parts, but on larger parts, the spray can be very tedious and the setup time can take as long if not more time than the actual scanning.
Stickers, also known as positioning targets, are small reflective dots that help the scanner pick up on parts that may otherwise be hard to scan. Like with spray, this is usually much more of an issue with larger parts as the stickers have to be placed generously across the part. This setup time can take away from scanning, and adds more time to the process that can be sped up.
The KEYENCE WM-6000 Series scanner does not need spray or stickers, making it a great solution for quick, easy, and accurate scans!
The KEYENCE WM-6000 Series: Harnessing the Power of Violet Light
The KEYENCE WM-6000 Series Wide Area Coordinate Measuring Machine (CMM) is the only metrology grade scanner on the market to use violet light. This advanced handheld CMM leverages the inherent benefits of violet light to deliver a powerful, precise, and user-friendly measurement solution for a wide array of applications. In addition to violet light, it also can use cross-hatch lasers to scan larger areas much quicker than traditional single line scanners.
Why the WM-6000 Series is Best-in-Class:
- Unrivaled Portability with Violet Light Precision: The WM-6000 Series combines the flexibility of a handheld system with the high accuracy typically associated with stationary CMMs, thanks to its optimized violet light projection.
- Effortless Scanning of Complex Parts: Its ability to handle diverse surface finishes and geometries without pre-treatment makes it incredibly versatile for measuring everything from large automotive frames to intricate machined components.
- Intuitive Operation: Designed for ease of use, the WM-6000 Series allows operators of varying skill levels to achieve precise measurements quickly and efficiently, minimizing the learning curve.
- Robust Performance in Any Environment: The violet light system's resistance to ambient light ensures reliable data collection directly on the shop floor, eliminating the need to move parts to a dedicated inspection room.
- Promotes Efficiency and Reduces Costs: By providing fast, accurate, and repeatable measurements directly where they are needed, the WM-6000 Series streamlines quality control processes, reduces rework, and ultimately lowers operational costs.
Choosing Your Ideal Handheld 3D Scanning Solution
When selecting a 3D scanning solution, consider the following critical factors:
- Required Accuracy and Detail: For the highest precision and intricate detail, violet light scanners are indispensable.
- Material Types and Surface Conditions: If you frequently scan challenging surfaces, violet light offers significant advantages.
- Environmental Conditions: For shop-floor use or environments with variable lighting, violet light's resistance to interference is key.
- Ease of Use and Workflow Integration: Look for systems that enhance productivity and can be easily integrated into existing processes.
- Budget vs. Long-Term Value: While initial investment may vary, consider the long-term benefits of superior accuracy, reduced rework, and increased throughput provided by advanced technologies like violet light.
In conclusion, while white and blue light handheld scanners have their applications, violet light scanning, exemplified by systems like the KEYENCE WM-6000 Series, stands out as the superior choice for demanding industrial measurement tasks. Its unparalleled precision, surface adaptability, and environmental robustness make it the optimal investment for future-proofing your quality control processes!
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