Precision parts Foreign matter inspection

Small-hole contamination: compare the bore with its surrounding surface

The application capture shows a grid of bright holes in a textured surface. Coaxial illumination provides a controlled view along the camera axis so bore appearance can be tested against the surrounding material.

Test the full bore depth before treating a bright hole as an unobstructed one.

Parts in this setup Build this system
3D illustration of the inspection setup: Contamination in small holesSource blue-coaxial capture: circular holes appear brighter than the textured surface around them.Real camera capture
3D illustration of the arrangement · Explore it in 3D
  • MethodBlue coaxial illumination
  • EvidenceReal application-lab capture
  • SetupSource light identified; imaging kit proposed
  • AcceptanceValidate on your own parts

The challenge

Small holes may contain shadows, machining texture and debris with similar intensity.

Changing the light angle can turn a usable bore view into glare or hide material along a wall.

How it was solved

The source uses the blue LS-COPS40 coaxial light for impurity inspection in holes. Illumination is directed through the coaxial module into the same general axis used for viewing.

The proposed trial compares empty, partially obstructed and acceptable holes at the final depth and surface finish.

Why it works

  1. 1

    Coaxial illumination changes which flat surfaces and internal features return light toward the camera.

  2. 2

    The source demonstrates visible hole contrast; it does not identify the contaminant material or state its size.

Lighting application-lab catalog capture

Evidence you can inspect

Visible in the images

Circular bright holes stand out from a darker textured surrounding surface.

What the source reports

The source labels the application impurity inspection in holes and identifies the blue LS-COPS40.

How to use this evidence

This is a lighting trial. A dark or bright patch alone cannot identify a material or prove a clear passage at every depth.

From image contrast to a production decision

What to validate on your part

  1. 01

    Define acceptable bore appearance

    Include real machining marks, edge chamfers and depth variation.

  2. 02

    Place known obstructions

    Test representative debris at the entry, wall and bottom of the hole.

  3. 03

    Set the decision region

    Compare detection and false calls using the same focus, aperture, illumination and part position.

From the demo to your test bench

Parts in this setup

Build this system
40 x 40 mm Coaxial parallel light (LS-COPS40) LightTested LS-COPS40 40 x 40 mm Coaxial parallel light (LS-COPS40) Blue LS-COPS40 is explicitly identified in the source impurity-in-hole example. Printed emitting area 40 × 40 mm; housing 135 × 50 × 48 mm. $109.00 In proposed setup Hikrobot MV-CS050-10GM(NPOE) 5 MP GigE area scan camera, IMX264, Gen 2 basic version, Mono, Without PoE CameraOur pick MV-CS050-10GM(NPOE) Hikrobot MV-CS050-10GM(NPOE) 5 MP GigE area scan camera, IMX264, Gen 2 basic version, Mono, Without PoE 5 MP monochrome global-shutter camera for a bench contrast trial; confirm sampling, sensitivity and exposure on the actual part. $819.00 In proposed setup 35mm, F2.8, 1.1", C-mount, Macro lens (59 mm (-0.7X) to 150 mm (-0.25X)) (LS-KF3528M-ML) LensOur pick LS-KF3528M-ML 35mm, F2.8, 1.1", C-mount, Macro lens (59 mm (-0.7X) to 150 mm (-0.25X)) (LS-KF3528M-ML) Proposed 35 mm C-mount macro lens. The illustration uses its printed 0.25x magnification at 150 mm working distance. The proposed camera sensor gives a derived 33.7824 × 28.2624 mm field. Confirm field, focus and residual distortion on the actual sample; this is not calibrated measurement accuracy. $339.00 In proposed setup Camera stand with XZ adjustment and glass tray, height 600 mm (LS-BT-XZ-G-6-6045) Camera test stationOur pick LS-BT-XZ-G-6-6045 Camera stand with XZ adjustment and glass tray, height 600 mm (LS-BT-XZ-G-6-6045) 600 mm column, 600 × 450 mm breadboard, XZ adjustment, glass tray and two lighting holders as listed. Proposed bench fixture; confirm loads, travel and camera/lens clamps. $359.00 In proposed setup

"Tested" identifies the part named in the source. "Our pick" is a proposed alternative or supporting part. Confirm colour, optics, controllers, power supplies, cables and mounting before ordering.

The set-up

LightingBlue coaxial illumination
Test lightLS-COPS40, blue
Emitting area (printed)40 × 40 mm
Camera and lensSource versions not identified; current proposed parts below
3D spacingIllustrative, to be confirmed on the sample
Derived proposed field33.7824 × 28.2624 mm = sensor dimensions / 0.25x; source field not supplied
Mounting (proposed)LS-BT-XZ-G-6-6045; 600 mm column, 600 × 450 mm base, glass tray and two light holders

Mount the optics with intent

The station is an optical test bench, with its two lighting holders included in the catalog listing. The 3D column and base follow the published height and footprint. Carriages, clamps and part supports are schematic: confirm camera screw pattern, lens support, light fasteners, permissible load and actual travel before ordering.

Complete the electrical system

Select a controller against the exact light voltage, drive mode and power, then confirm camera data/power/I/O cables and a suitable PC. These are not silently added to the proposed optical kit.

Build this system

Start from this setup, adapt it to your part.

The configurator opens with this study's camera, lens, light and station picked. Swap any part, check fit and price, then buy or ask for a quote.

Build this system Quote the proposed setup Explore the 3D setup

Camera and available lens CAD are published models. Lens and light envelopes use printed dimensions. The linked station uses its published base size and column height; carriage, brackets, fittings, parts and spacing are illustrative. Confirm load, travel, fasteners and clearances before ordering. Light paths explain the arrangement and do not simulate optical performance. Representative part geometry is illustrative, not reconstructed inspection evidence.

Metal parts and machining

Related case studies

All metal parts and machining studies
Source backlight image: a dark circular plate contains four spring-window patterns, openings and a central hole. Metal parts and machining Mechanical assembly · Spring-pattern appearance Spring-window appearance in a clutch plate Use the spring-window pattern for appearance and prove mechanical function separately.Light in sourceLS-HFS150100 · whiteExplore the study Source blue-ring capture showing the small circular bit face, darker shaped regions and a bright central strip. Metal parts and machining Cutting-tool manufacturing · End-face appearance inspection Cutting-bit end-face appearance Prove the local end-face signal before assigning a wear or damage threshold.Light in sourceLS-FLS74 · blueExplore the study Fourth-generation line-light capture: the marked feature has stronger visible contrast; the red box is original. Metal parts and machining Machining and cylindrical components · Curved-surface inspection Scratch contrast on a machined cylinder A curved surface needs a tested angular coverage plan.Proposed light housing (spec)440 × 50 × 117.13 mmExplore the study

Make the next trial specific.

Tell us the part size, smallest defect or tolerance, available working distance, material and line speed. Include what a good part and a reject look like.

Discuss your application Browse all case studies

About this case study: the photos and camera images come from the application laboratory of the maker of the lighting and optics we sell, imaged on the parts shown; your results depend on your part, camera and set-up. This is an application-lab study, not a LumaSpec customer deployment. Source figures are reported results; proposed components require a fresh trial. The 3D scene illustrates the arrangement and does not simulate imaging performance.