Submillimetre-accuracy dimensional verification of complex fabrications, turbine components, pressure vessel heads, and precision assemblies — capturing the complete three-dimensional form of a component against CAD nominal geometry and GD&T specifications where manual measurement tools and contact-based CMM cannot reach.
High-precision 3D laser scanning
metrology is the measurement of a component's complete three-dimensional form
against its engineering specification — using non-contact laser scanning
systems to capture geometry at submillimetre accuracy across surfaces that
conventional CMM probes, hand gauges, and template checks cannot fully
characterise.
The full scan dataset is
registered against the component's CAD nominal geometry or its GD&T
(Geometric Dimensioning and Tolerancing) drawing specification. The result is a
comprehensive, surface-by-surface deviation analysis — showing every point where
the manufactured component deviates from its design intent and by how much —
across curved surfaces, compound angles, internal features, and large-format
components that exceed the working envelope of contact measurement systems.
All metrology scanning performed
by Altair Engineering Inspection is traceable to UKAS-accredited calibration
standards. Measurement uncertainty documentation is structured to meet the
requirements of ISO 17025 and ASME B89. Reports are formatted for engineering
review, regulatory submission, and client quality management system
requirements.
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Precision fabrication
dimensional verification — flanges, nozzles, vessel heads, tube sheets
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Turbine and rotating
equipment casing geometry assessment
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Structural assembly fit-up
verification prior to installation
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As-built vs. as-designed
dimensional comparison — CAD overlay and deviation mapping
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Repair geometry
verification following post-machining or post-weld dressing
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Reverse engineering data
capture for legacy and heritage components
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Quality gate inspection at
fabrication hold points — dimensional conformance prior to next stage
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OEM and third-party
acceptance inspection for precision manufactured components
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ISO 17025 — Measurement
traceability and laboratory accreditation requirements
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ASME B89.4 — Performance
evaluation of coordinate measuring systems (applicable to 3D scanning
metrology)
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ISO 10360 — Acceptance and
reverification tests for coordinate measuring machines
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ASME Y14.5 — Geometric
Dimensioning and Tolerancing — the basis for GD&T deviation reporting
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ISO 1101 — Geometrical
product specifications (GPS) — tolerances of form, orientation, location
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VDI/VDE 2634 — Optical 3D
measuring systems — performance characteristics and verification
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OEM-specific inspection
specifications for turbine, aerospace, and precision component acceptance