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Start by identifying the method and decision
“Laser inspection” can describe different tests with different measurands. A dimensional scan or profilometer maps surface geometry; shearography and holography observe surface movement under stress to infer certain hidden flaws; laser vibrometry measures vibration. Their results are not interchangeable, and each requires method-appropriate interpretation and training. ASNT summarizes the limitation: “Most laser methods measure the surface. They detect hidden defects only by measuring how the surface responds to those defects, not by seeing through the material directly.” ASNT’s overview of laser methods.
Before interpreting a plot, establish what the inspection was meant to decide: dimensional release, a need for further inspection, a nonconformance, or another disposition. Also establish whether the document is a measurement report, a nonconformance report (NCR), or an authorized disposition. A measurement supplies evidence; it does not by itself authorize acceptance or rejection.
What each method can support
| Method | What it measures | What the result can support |
|---|---|---|
| Laser scanning or profilometry | Surface geometry, such as dimensions, wear, erosion, weld profiles, or overall shape. | Assessment of the measured surface. It does not directly show internal defects. |
| Shearography or holography | Surface movement patterns before and during applied stress. | Inference about possible underlying disbonds, delaminations, or other flaws from deformation response—not a direct image through the material. ASNT describes shearography as less sensitive to environmental vibration than holography. |
| Laser vibrometry | Vibration, measured without contact from changes in reflected light. | Interpretation of vibration output in relation to the test setup and expected behavior, not as a dimensional deviation map. |
Check the report context before reading its colors
Confirm that the report identifies the inspected part and the governing reference: drawing or CAD file name and revision, units, datum or reference strategy, alignment method, tolerance source, and feature annotations. It should also identify the coverage, scale range, and who reviewed the result. Missing context makes a map difficult to connect to a specific requirement or decision.
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- Reference: Is the drawing or CAD revision the one that governs this inspection, and are the units correct?
- Alignment: Is the part aligned by datums or by best fit, and is the choice explained? Those methods can produce different deviation pictures. A favorable global best fit does not necessarily establish critical datum relationships.
- Criteria and authority: What specification supplies the tolerance, and who is authorized to accept, reject, or disposition a nonconformance?
- Report status: Does the document state a measurement, identify an NCR, or record an approved disposition?
GDS guidance on reading a 3D scan report likewise emphasizes that the color map is not an acceptance decision.
Separate measured coverage from missing or unreliable data
Inspect the coverage and data-quality information for missing regions, occlusions, low point density, reflective noise, motion, or access limitations. A blank or unmeasured area is not the same as a measured area within tolerance. If a critical surface could not be seen or measured reliably, the scan cannot establish its condition.
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Surface finish and test environment can affect results. Reflective, transparent, and very dark surfaces may interfere with measurement. Ambient light, vibration, air movement, and temperature can also affect accuracy. Treat low coverage and noisy or moving returns as data-quality concerns to resolve, not as clean measurements. Ask whether the inspection needs another setup, a different method, or a separate examination of the affected feature.
Read the map scale and feature results against the requirement
For a deviation map, check the units, legend limits, tolerance band, viewing orientation, and feature annotations. Determine whether the colors are clipped or automatically scaled and whether the displayed threshold matches the acceptance criterion. Red and blue indicate values relative to the selected reference and scale; neither color means “fail” or “pass” on its own.
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Give priority to feature results tied to drawing callouts and functional surfaces over the overall rendering. A small deviation on a mating feature may be more consequential than a larger deviation on a noncritical surface. Compare each relevant result with its actual specified tolerance and feature criticality rather than judging by the apparent size or color of a patch.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Relate deviation to uncertainty and acceptance authority
A reported deviation is evidence, not an automatic verdict. Compare it with the governing drawing, procedure, contract specification, or applicable method-specific standard, taking account of the inspection method’s capability and uncertainty. The report should provide calibration or traceability information appropriate to the decision and identify who sets the criteria and who can make the disposition.
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NIST’s 2021 review of terrestrial laser scanners discusses application-dependent tolerance needs, scanner error sources, performance evaluation, and traceability. It describes tasks ranging from “few tens of millimeters” for historical monument digitization to “few tens of micrometers” in high-precision manufacturing and assembly. Those figures describe the range of application needs, not a promise of scanner accuracy. NIST’s review of terrestrial laser scanner metrology.
NIST also publishes an expanded uncertainty of U(k=2)=(22+0.6L) µm, where L is interval length in meters, for sphere-to-sphere center-distance testing in its laser scanner ranging service. This is a result for that stated test, not a universal accuracy rating for laser scanners. NIST’s laser scanner ranging service description.
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When a result is not enough to decide
Pause the acceptance decision when the report does not identify its method or reference, when critical features are missing or unreliable, when the alignment or map threshold is unclear, or when uncertainty and authority are not addressed for a close result. Ask the inspection provider or responsible quality authority to clarify the report, assess the affected feature with a suitable method, or determine the required follow-up under the governing specification. The applicable acceptance standard cannot be inferred without the industry, material, method, and jurisdiction.
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