--- title: "Automated CMM Types: Tactile, Laser, Structured Light, X-Ray | Polyrix" description: Learn about automated CMM types, Tactile Probe, Laser Interferometry, Laser Scanners, Structured Light, and X-Ray, for precision manufacturing and inline metrology. image: https://polyrix.com/hubfs/AI-Generated%20Media/Images/Show%20a%20robotic%20arm%20on%20a%20production%20line%20moving%20a%20car%20part%20the%20robotic%20arm%20should%20be%20in%20blue%20ideally%20colour%200066FF-1.png --- [+1 418-210-0198](tel:+1-418-210-0198) [![logo-polyrix-white](https://polyrix.com/hs-fs/hubfs/Polyrix%20Logos/logo-polyrix-white.png?width=45&height=36&name=logo-polyrix-white.png "logo-polyrix-white")](https://polyrix.com/) [Book a Demo](https://polyrix.com/contact#section-2) - [Products](https://polyrix.com/overview) - [Overview](https://polyrix.com/overview) - [PolyScan XS](https://polyrix.com/polyscan-xs) - [PolyScan XM](https://polyrix.com/polyscan-xm) - [PolyScan XL](https://polyrix.com/polyscan-xl) - [PolyScan XH](https://polyrix.com/polyscan-xh) - [PolyScan V](https://polyrix.com/polyscan-v) - [Technology](https://polyrix.com/technology/polyrix-portal) - [Polyrix Portal](https://polyrix.com/technology/polyrix-portal) - [Surround.Scan](https://polyrix.com/technology/surround-scan) - [Live.Inspection](https://polyrix.com/technology/live-inspection) - [Simulation.Lab](https://polyrix.com/technology/simulation-lab) - [Fast.Scan](https://polyrix.com/technology/fast-scan) - [Smart.Fit](https://polyrix.com/technology/smart-fit) - [Calibration.Plus](https://polyrix.com/technology/calibration-plus) - [Applications](https://polyrix.com/applications/inline-metrology) - [Inline](https://polyrix.com/applications/inline-metrology) - [Process Integration](https://polyrix.com/applications/process-integration) - [Automotive](https://polyrix.com/applications/automotive) - [Aerospace](https://polyrix.com/applications/aerospace) - [Sheet Metal](https://polyrix.com/applications/sheet-metal) - [Casting](https://polyrix.com/applications/casting) - [Partners](https://polyrix.com/partners) - [About](https://polyrix.com/about) - [FAQs](https://polyrix.com/about/faq) - [Blog](https://polyrix.com/blog) - [Case Studies](https://polyrix.com/blog/tag/case-study) - [Contact](https://polyrix.com/contact) [+1 418-210-0198](tel:+1-418-210-0198) [Book a Demo](https://polyrix.com/contact#section-2) This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. [Inline Metrology](https://polyrix.com/blog/tag/inline-metrology) [Metrology Trends](https://polyrix.com/blog/tag/metrology-trends) [Offline Metrology](https://polyrix.com/blog/tag/offline-metrology) [At-Line Metrology](https://polyrix.com/blog/tag/at-line-metrology) # Exploring the Different Types of Automated Coordinate Measuring Machines (CMMs): Tactile Probe, Laser Interferometry, Laser Scanners, Structured Light, and X-Ray for Precision Manufacturing ![Kim Marx Bloomfield](https://polyrix.com/hs-fs/hubfs/Kim%20Headshot%201723043659148.jpeg?width=48&height=48&name=Kim%20Headshot%201723043659148.jpeg) By Kim Marx Bloomfield 4 min read Nov 6, 2025 ##### Share - - - - [mailto:?subject=Check%20out%20https://polyrix.com/blog/exploring-the-different-types-of-automated-coordinate-measuring-machines-cmms-tactile-probe-laser-interferometry-laser-scanners-structured-light-and-x-ray-f-1762448606001&body=Check%20out%20https://polyrix.com/blog/exploring-the-different-types-of-automated-coordinate-measuring-machines-cmms-tactile-probe-laser-interferometry-laser-scanners-structured-light-and-x-ray-f-1762448606001&media=https://44715633.fs1.hubspotusercontent-na1.net/hubfs/44715633/AI-Generated%20Media/Images/Show%20a%20robotic%20arm%20on%20a%20production%20line%20moving%20a%20car%20part%20the%20robotic%20arm%20should%20be%20in%20blue%20ideally%20colour%200066FF-1.png](mailto:?subject=Check%20out%20https://polyrix.com/blog/exploring-the-different-types-of-automated-coordinate-measuring-machines-cmms-tactile-probe-laser-interferometry-laser-scanners-structured-light-and-x-ray-f-1762448606001&body=Check%20out%20https://polyrix.com/blog/exploring-the-different-types-of-automated-coordinate-measuring-machines-cmms-tactile-probe-laser-interferometry-laser-scanners-structured-light-and-x-ray-f-1762448606001&media=https://44715633.fs1.hubspotusercontent-na1.net/hubfs/44715633/AI-Generated%20Media/Images/Show%20a%20robotic%20arm%20on%20a%20production%20line%20moving%20a%20car%20part%20the%20robotic%20arm%20should%20be%20in%20blue%20ideally%20colour%200066FF-1.png) ## **Introduction to Industrial Metrology and Quality Assurance** In modern manufacturing, **industrial metrology**—the science of precise measurement—is essential for **quality control and production efficiency**. From automotive to aerospace and medical devices, accurate metrology ensures components meet specifications, reduces scrap, and optimizes throughput. It's important to balance quality with requirements; over-specifying parts can be costly, while failing to check quality can lead to defects. Choosing the right **automated metrology system** directly impacts **productivity, measurement accuracy, and cost savings**. The goal of any CMM is to measure precise points on a part to create accurate 3D geometries that support manufacturers with part identification, quality assurance, and traceability of finished products. This guide compares top **automated CMM technologies** — **Tactile Probe**, **Laser Radar**, **Laser Scanners**, **Structured Light** (like[**Polyrix Surround.Scan™**](https://polyrix.com/technology/surround-scan)), and **X-Ray/CT Metrology**. We also review **offline, at-line, and** [**inline inspection**](https://polyrix.com/services/inline-metrology) methods, highlighting advantages, limitations, and best-use cases. Learn how these technologies can be integrated into **automated production lines**, including robotics, for modern manufacturing. ### **Tactile Probe CMM – High-Accuracy Contact Measurement![I need an unbranded Tactile Probe CMM using colour0066FF-1](https://polyrix.com/hs-fs/hubfs/AI-Generated%20Media/Images/I%20need%20an%20unbranded%20Tactile%20Probe%20CMM%20using%20colour0066FF-1.png?width=225&height=225&name=I%20need%20an%20unbranded%20Tactile%20Probe%20CMM%20using%20colour0066FF-1.png)** **Tactile Probes**, also known as Contact Probes, are a foundational industry standard for **dimensional metrology**, using physical contact. #### **Advantages of Tactile Probe CMM:** - High precision and repeatability - Works on any type of surface finish (even mirror or transparent) - Ideal for small-to-medium parts - Stable, traceable calibration #### **Limitations of Tactile Probe CMM:** - Point-by-point probing slows cycle times, less suitable for inline inspection - Requires controlled lab environments - Limited access for complex geometries - Requires contact with the part (risk of collision or damage) - Repair costs for damaged probes can be high **Best for:** Ultra-precise dimensional verification where accuracy is prioritized over speed. ### **Laser Interferometry and Laser Scanning – Non-Contact 3D Measurement![I need an unbranded laser tracker like httpswwwgooglecomurlsaiurlhttps3A2F2Fleicageosystemscom2Fproducts2FlasertrackersystemspsigAOvVaw1XvIGm9gic6LWlY](https://polyrix.com/hs-fs/hubfs/AI-Generated%20Media/Images/I%20need%20an%20unbranded%20laser%20tracker%20like%20httpswwwgooglecomurlsaiurlhttps3A2F2Fleicageosystemscom2Fproducts2FlasertrackersystemspsigAOvVaw1XvIGm9gic6LWlY.png?width=200&height=200&name=I%20need%20an%20unbranded%20laser%20tracker%20like%20httpswwwgooglecomurlsaiurlhttps3A2F2Fleicageosystemscom2Fproducts2FlasertrackersystemspsigAOvVaw1XvIGm9gic6LWlY.png)** **Laser interferometry systems**, or **laser scanners**, create dense 3D point clouds by sweeping a laser across the part surface. They offer **fast, non-contact inspection** of large components. Although one uses triangulation and the other a single laser (interferometry), their advantages, disadvantages, and use cases are similar. #### **Advantages of Laser Interferometry and Laser Scanning:** - High-speed scanning of large assemblies (slightly slower than structured light systems) - Non-contact, avoiding collision issues - Excellent for freeform surfaces - ***Interferometry:*** Limited accuracy for large assemblies; very accurate at a single depth #### **Limitations of Laser Interferometry and Laser Scanning:** - Sensitive to vibration, lighting, and surface reflectivity - Slightly less accurate than tactile probes for fine tolerances - Line-of-sight limitations - Surface finish can impact results - Generally requires robotic positioning to maintain laser alignment **Best for:** High-throughput inspections where **speed and surface coverage** are critical. ### **Structured Light CMM – Optical 3D Scanning with Polyrix Surround.Scan™** ### **![Polyrix - PolyScan V - 506053-2](https://polyrix.com/hs-fs/hubfs/Polyrix%20Product%20Images/Polyrix%20-%20PolyScan%20V%20-%20506053-2.jpg?width=332&height=222&name=Polyrix%20-%20PolyScan%20V%20-%20506053-2.jpg)** **Structured Light** uses a projected pattern to capture more data at once, converting images into a full 3D model using advanced algorithms. This **non-contact optical metrology** is ideal for **inline, at-line, or offline inspection**. Two common configurations exist: a movable single system on a robotic arm or a fixed array. Polyrix’s Surround.Scan™ uses a fixed array of multiple scan units around the part, saving time and increasing data capture speed. #### **Advantages of Structured Light:** - Fast full-field data capture in seconds - No part movement or contact required if surround configuration is used - Adaptable: single movable system or multiple sensor array - Scalable for small to large assemblies - Flexible for production integration #### **Limitations of Structured Light:** - Lighting may affect accuracy - Surface finish can impact results - Line-of-sight limitations - Hidden features may require additional scan units - If not part of an array, a robot or turntable is likely required **Best for:** Automated high-speed inspection with **full coverage and flexibility**. **Polyrix [Surround.Scan™](https://polyrix.com/technology/surround-scan)** combines **multiple sensors and structured light** for **360° capture without part rotation or targets**, making it ideal for **inline and at-line metrology**. [Discover the full capabilities of Surround.Scan™](https://polyrix.com/technology/surround-scan)   ### **X-Ray and Computed Tomography (CT) CMM – Internal and External Inspection![I need an unbranded Xray scanner using colour0066FF-1](https://polyrix.com/hs-fs/hubfs/AI-Generated%20Media/Images/I%20need%20an%20unbranded%20Xray%20scanner%20using%20colour0066FF-1.png?width=200&height=200&name=I%20need%20an%20unbranded%20Xray%20scanner%20using%20colour0066FF-1.png)** **X-Ray/CT metrology** allows non-destructive measurement of internal and external geometries. #### **Advantages of X-Ray and Computed Tomography (CT):** - Detects internal defects, cracks, and voids - Captures hidden geometries in a single scan - Supports full-part validation for complex assemblies #### **Limitations of X-Ray and Computed Tomography (CT):** - Expensive and slower scanning - Requires radiation safety protocols - Limited by part size and material density **Best for:** Internal inspection and quality verification of critical parts such as casting inspection, additive manufacturing, and defect detection. ## **Comparing Offline, At-Line, and Inline Automated CMM Metrology Across Technologies** | **Setup Type** | **Description** | **Compatible Automated CMM Technology** | **Advantages** | **Limitations** | | --- | --- | --- | --- | --- | | **Offline** | **Dedicated measurement lab away from production ** | - Tactile Probe - X-Ray/CT | - Maximum accuracy - Controlled environment | - Not real-time  - Slower feedback | | **At-Line** | **Near-production,  often to the side of production for sampling** | - Laser Interferometry/ Laser Scanning - Structured Light | - Faster feedback - Reduced logistics - Semi-automated operation | - Some handling required - Can be completed with robotics but typically not fully automated | | **Inline ** | **Fully integrated into production** | - Structured Light  - Laser Scanning | - Real-time automated inspection - Zero handling - Supports closed-loop control | - Higher integration cost - Requires inline process management and calibration | > **Polyrix [Surround.Scan](https://polyrix.com/technology/surround-scan)™** bridges offline, at-line, and inline systems, delivering **high-speed, automated metrology-grade precision** without contact, markers, or any required movement of sensor(s). > >   ## **Robotics in Industrial Metrology** Integrating **robots with metrology** enables automated, continuous inspection. Robots can position scanners, cameras, or parts for precise, repeatable measurements. #### **Advantages of leveraging Robotics:** - Enables real-time quality control - Reduces handling and cycle times - Compatible with multiple inspection tools - Supports closed-loop production feedback #### **Robotics limitations to consider:** - Robot speed may constrain scan rate - Requires strict calibration and safety standards - Repairs can be costly in case of collisions or maintenance ## **Choosing the Right Metrology Strategy** Consider the following when selecting a metrology solution: - **Accuracy vs. Speed** – Balance tolerance requirements with production throughput - **Part Complexity** – Evaluate accessibility, hidden features, and geometry - **Production Environment** – Lab versus shop-floor conditions - **Automation Goals** – Robot, conveyor, and MES integration - **Scalability** – Handle multiple part types efficiently - **Value** – Price and desired outcomes, including potential cost savings from reduced returns and product recalls Flexible systems like **[Polyrix Surround.Scan](https://polyrix.com/technology/surround-scan)™** often provide the ideal combination of **speed, precision, and automation**. ---   ##### **Experience Real-Time Industrial Metrology with Polyrix Surround.Scan™** **Polyrix Surround.Scan™** transforms automated inspection with **multiple structured light sensors offering full 3D measurement without part rotation or manual setup**. - **Automation-ready:** Optimized for production environments; single-button operation perfect for at-line, offline, and inline metrology - **360° coverage:** Multi-baseline (combinatorial coverage) provides full part scanning in seconds - **Fast and precise:** Production-speed inspection with metrology-grade accuracy Enhance your quality control with a **non-contact, high-speed, and data-rich metrology solution**. > [➡️ **Learn more about Surround.Scan™**](https://polyrix.com/technology/surround-scan) or [**contact our team**](https://polyrix.com/contact) to discover how it can improve your automated inspection strategy. 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