坐标测量机与光学测量：主要区别是什么？

制造部件的测量技术历经数十年演进。传
传统坐标测量机（CMM）为精度验证奠定了基础，而
光学计量技术则带来了高速检测与非接触式检测的突破。

什么是CMM（坐标测量机）？

坐 三坐标测量机 is a device that measures the geometry of physical objects
using a probing system. A probe touches the part surface at different points, recording X, Y
and Z coordinates. These coordinates define distances, flatness, roundness, concentricity
and dimensional variation.

CMM technology relies on physical contact. A stylus travels along different axes,
interpolates coordinates, compares them with nominal design values and produces
deviations. This approach has been used for decades in machining, aerospace tooling,
automotive castings and large assemblies.

CMM acts like a mechanical inspector that verifies size with direct surface contact.
Measurements are repeatable, stable and highly trusted when dealing with metal blocks,
gears, brackets and fixtures. However, touch-based sensing introduces limits when features
become smaller, surfaces more delicate, or inspection cycle time requires significant speed.

坐标测量机类型

Different mechanical structures exist because measurement needs vary in volume, weight
and dimensional reach.

1. 桥式 坐标测量机

桥式三坐标测量机通常适用于精度稳定的中型零件。其结构类似龙门架，探头臂沿X-Y轴移动，垂直Z轴立柱则用于测量高度。

2. 悬臂式 坐标测量机

悬臂式三坐标测量机提供三面开放式操作通道，可容纳更宽的工件装载，但在伸展长度下刚性较低。

3. 龙门式 坐标测量机

龙门式三坐标测量机可处理大型发动机、航空航天梁和重型模具。该结构在长跨度下保持刚性，但需要专用占地面积和隔振措施。

4. 卧式臂坐标测量机

卧式臂式三坐标测量机适用于钣金件、车身及大型外壳的测量。其具备较大的测量范围，但相较于桥式系统精度有所降低。

Each type balances rigidity, workspace and accuracy. Selection depends on tolerance bands,
part mass, environment control and measurement complexity.

的最佳应用场景

CMM fits applications where contact probing is acceptable. Metal machining, mold base
inspection, gear measurement, bearing surfaces, automotive blocks and turbine housings
form common examples.

Large parts that require deep probing benefit from mechanical travel. Form checks such as
perpendicularity, flatness, roundness and hole-to-hole spacing work effectively. Tolerance
studies, PPAP validation, reverse engineering and calibration tasks frequently rely on
contact-based metrology.

CMM maintains accuracy for macro-dimensioned components. It functions well when
throughput is moderate and manual programming time is manageable.

何时CMM会成为瓶颈？

CMM limitations appear when micro-features reduce to micron-level dimensions, when
reflective surfaces disturb touch response or when cycle time becomes critical. The stylus
cannot measure soft materials without deformation risk. Miniaturized electronics, wafer-
level packaging, HDD suspension parts, connectors and micro-mechanical components
challenge the probing tip.

Mechanical contact increases inspection time because each feature requires sequential
touches. For high-volume production, tool wear, operator dependency and thermal
variation further slow throughput. In such environments, non-contact optical metrology
emerges as a practical alternative.

什么是光学计量？

光学计量 measures features using light. Cameras, sensors, interferometers and
vision systems capture images instead of touching surfaces. Algorithms convert pixels into
dimensional information.

Optical systems read edges, contours, heights and surface textures using illumination.
Because no physical probe contacts the part, delicate geometries remain undisturbed.
Speed increases significantly as entire areas capture data in a single frame.

This approach serves industries that demand high-resolution imaging, micron-level accuracy,
wafer measurement, lens inspection, mobile components, micro-electronics and critical
dimension analysis.

光学计量如何工作？

The principle revolves around light projection and image capture. A camera observes the
component while illumination highlights edges and surfaces. Software detects boundaries
and computes dimensions mathematically.

In 2D mode, XY coordinates define lengths, diameters and spacing. In 3D mode, structured
light, confocal imaging or interferometry generate depth profiles. Millions of points capture
simultaneously, creating a dense measurement cloud.

Calibration standards ensure repeatability. Algorithms correct distortion, focus depth and
temperature influence. This process offers ultra-fast analysis, particularly suited for
semiconductor processing, HDD suspension metrology, connector measurement, WLP
metrology, non-contact inspection and critical micro-feature validation.

光学测量系统类型

光学系统因照明条件、传感器类型及尺寸深度而异。

● A video measuring machine processes 2D dimensions rapidly with high
magnification lenses.
● A 3D optical scanner provides contour mapping, form analysis and large point
clouds.
● A white light interferometer evaluates surface flatness, micro-roughness and sub-
micron features.
● A vision-based measurement scope measures edges, pitch, spacing and hole
diameter without touching the sample.

Each method strengthens non-contact metrology depending on part scale, geometry
complexity and surface reflectivity.

为什么非接触式测量是未来趋势？

Product miniaturization continues across technology sectors. Micro-chips, dense
connectors, flexible substrates and wafer-level packages demand measurement without
damage. Touch probing struggles with evolving materials, scale and geometry.

Non-contact systems achieve high throughput with minimal operator skill dependency.
Optical metrology integrates automation, robotic part handling and inline process control.
This aligns with modern manufacturing where feedback loops reduce re-work, scrap and
inspection overhead.

As production accelerates, measurement resolution and speed form core competitive
parameters. Optical metrology supports rapid decision cycles without compromising
tolerance verification.

CMM vs Optical Metrology (Comparison)

The difference reflects not superiority but suitability, depending on material, tolerance and
throughput expectation.

何时选择三坐标测量机（CMM）与何时选择光学测量系统

The decision depends on geometry scale, tolerance class, material type and inspection load.
CMM suits macro parts requiring deep probing or tactile reference; on the other hand,
optical metrology suits micro-level features, high-volume production and fragile
components.

Many facilities adopt hybrid systems, using CMM for structural verification and optical
measurement for fine-feature validation.

适用于以下应用场景：

Large industrial components, metal blocks, gears, housings and fixtures require tactile
verification. CMM applies when speed is secondary, accuracy matters and measurement
depth is essential. Manual inspection tasks, prototype validation and legacy tooling remain
CMM-oriented as long as geometry stays macro-scaled.

光学计量适用于以下应用场景：

Miniaturized electronics, semiconductor wafers, HDD suspensions, mobile modules, thin
connectors, micro-optical parts and wafer-level packaging components require non-contact
evaluation. High throughput, precise imaging and fragile material handling align with optical
metrology capability. It handles reflective, flexible and contamination-sensitive surfaces
effectively.

受益于光学计量技术的行业

Semiconductor fabrication, micro-electronics assembly, probe card inspection, connector
manufacturing, HDD suspension design, precision optics, wafer-level chip packaging and
mobile-phone component metrology leverage optical technology.

Non-contact imaging allows entire fields of view to be measured simultaneously,
maintaining speed and resolution that CMM struggles to deliver in miniature work
environments.

现代光学计量学如何适应这一转变

Optical systems represent an evolution in dimensional metrology. They address needs
arising from miniaturization, tighter tolerances and faster manufacturing cycles. Light-based
scanning collects data without mechanical drag, removing friction, deformation and probe-
induced uncertainty.

Automation integration supports inline inspection strategies. Quality loops shrink as
inspection connects directly to production control. Dimensional verification transitions from
a bottleneck to a flow-aligned process.

光学计量能力

Optical measurement platforms handle 2D and 3D features with precision. Magnification
lenses, advanced illumination, contrast optimization and interferometric sensors create
high-density point clouds.

Critical dimension measurement becomes efficient. Non-contact metrology measures
features difficult to reach mechanically such as micro vias, lead frames, solder pads, spring
contacts and thin metallic suspensions.

光学计量有何不同？

Speed, no physical contact, high-resolution imaging and superior performance at small
scales define optical measurement. Vision algorithms detect edges precisely, and optical
zoom reaches sub-micron levels with consistent repeatability.

Unlike touch probes, no physical wear alters measurement behavior. Entire areas capture
rather than single points, enabling statistical representation of surfaces rather than isolated
coordinates.

深入了解先进光学技术，尽在View MM

The evolution from contact-based CMM inspection to high-speed optical measurement
reflects how manufacturing is rapidly shifting toward micro-precision, non-contact
dimensional control.

在 ViewMM focus on these next-generation metrology requirements through optical
video measurement, critical dimension analysis, probe-card inspection and semiconductor-
scale accuracy. For teams exploring faster, more scalable and delicate-part-friendly
inspection technology, a direct discussion offers clarity, application fit and outcome
understanding.

Get in touch to discuss requirements, application needs or integration possibilities, the
conversation begins here.

要点

CMM and optical metrology serve dimensional measurement, but operate fundamentally
differently. CMM applies tactile contact and excels with large parts, deep blind features and
rigid structures. Optical metrology removes probe dependency, improving speed and
allowing micro-scale inspection.

Manufacturing trends shift toward micro-electronics, wafer packaging and miniature
connectivity. In such domains, non-contact imaging aligns with future measurement
demands. Both technologies remain relevant as long as environments match their strengths.

常见问题解答

坐标测量机（CMM）与光学测量技术的主要区别是什么？

CMM通过物理探针测量几何形状，而光学系统则利用光线进行非接触式尺寸测量。

能否测量微型部件？

随着特征尺寸缩小，挑战随之而来。探针尺寸限制了可达性，变形风险随之上升。

为什么光学计量更快？

基于图像的系统能够一次性捕获整个区域，而坐标测量机（CMM）则是一点一点地采集数据。

光学测量能否完全取代三坐标测量机？

两者仍具实用价值，具体取决于零件尺寸、精度要求及材料特性。

哪种方法适用于半导体元件？

非接触式光学计量技术更适用于晶圆级、易碎且高度微型化的部件。