Glossy phone shells: see scratches in a controlled coaxial field
The real source capture shows several dark scratches against a bright, nearly even shell surface. A compact coaxial light supplies a controlled reflection for a small inspection region.
Control the reflected field before setting a scratch threshold.
Real camera capture
- Proposed light housing (spec)41 × 30 × 24 mm
- EvidenceReal application-lab captures
- Camera (proposed)2448 × 2048 monochrome
- Field (derived proposal)16.89 × 14.13 mm derived from printed 0.5x magnification
Lighting application-lab image sheet
What the camera saw
Cropped from the source test sheet; original test annotations are retained. Captures are not generated or enhanced. Drag a comparison slider, or open any image full size.
The challenge
A glossy shell reflects its surroundings. Scratches can disappear into uncontrolled highlights even when they cover many camera pixels.
How it was solved
The source uses white LS-3COX18-CP. The proposed 35 mm macro lens uses its printed 0.5x / 78 mm working-distance pair for a small field that fits the light.
The part photograph and result are source evidence; the camera, macro lens and test station are proposed.
Why it works
- 1
Illumination close to the viewing axis creates a bright background from the shell surface while local changes redirect the reflection.
- 2
A dark scratch line indicates visible surface contrast. Its intensity is not a depth measurement or proof of coating penetration.
Lighting application-lab image sheet
Evidence you can inspect
Several dark linear marks are visible against the bright shell surface.
The source describes clear scratch contrast; it supplies no scratch width, depth or validated detection percentage.
An application-lab lighting demonstration, not a customer deployment or a qualified production inspection. Proposed camera, lens, fixture and scene spacing require a fresh trial. Source observations do not establish a defect-size limit, accuracy guarantee or production false-call rate.
From image contrast to a production decision
What to validate on your part
- 01
Build a finish set
Collect good shells and known scratches across gloss, colour and coating lots.
- 02
Challenge direction
Rotate scratches and vary part tilt while keeping exposure fixed.
- 03
Set a visual reject rule
Validate the smallest unacceptable mark using calibrated sampling and observed contrast, without inferring depth.
From the demo to your test bench
Parts in this setup
LightTested
LS-3COX18-CP
High precision coaxial light, 41 x 30 x 24 mm (LS-3COX18-CP)
Exact source white light; 41 × 30 × 24 mm housing and 18 × 18 mm emitting surface. Confirm viewport clearance on the final setup.
$109.00
In proposed setup
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
Proposed 5 MP monochrome global-shutter camera, 2448 × 2048 pixels at 3.45 µm, C-mount. The source camera is unidentified. This NPOE model requires separate power and does not support PoE.
$819.00
In proposed setup
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)
35 mm C-mount macro lens. The printed 0.5x / 78 mm working-distance pair gives a derived 16.89 × 14.13 mm field on the proposed camera. Confirm focus and clearance through the small coaxial housing.
$339.00
In proposed setup
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, glass tray and two lighting holders. Proposed bench fixture; actual load, travel, clamps, mounting fasteners and light clearance must be confirmed.
$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
| Source camera | Not identified in the source sheet |
|---|---|
| Camera and lens | Proposed catalog components |
| Proposed field | 16.89 × 14.13 mm derived from printed 0.5x magnification |
| Lens-to-part in proposed scene | 78 mm; printed working-distance pair |
| Mounting (proposed) | LS-BT-XZ-G-6-6045 · catalog test station with two lighting 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.
Camera and available lens CAD are published models. Light envelopes and the station base/height use printed dimensions. Part shapes, brackets, holders, shielding and spacing are illustrative; they are not reconstructions of a source part or a complete mechanically validated assembly. Light paths explain the proposed arrangement and do not simulate optical performance. The proposed field is derived from the printed camera pixel dimensions and the stated lens magnification/working-distance pair, not measured from the source capture.
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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.
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.