Aluminium film: change the light angle to reveal local surface disturbance
The real comparison shows local marks on aluminium film under a conventional and an oblique line light. The oblique field gives the marked region stronger visible structure without measuring its depth.
Make a surface change visible before deciding whether it exceeds the specification.
Real camera capture
- Proposed light housing (spec)340 × 48 × 75 mm
- EvidenceReal application-lab captures
- Camera (proposed)2448 × 2048 monochrome
- Field (derived proposal)84.46 × 70.66 mm derived from printed 0.1x 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.
Oblique line light: Oblique line-light capture from the same test; the local marked structure is more visible.
The challenge
A reflective film can look nearly featureless under one angle. A shallow surface change may blend into the normal texture rather than form a strong intensity edge.
How it was solved
The sheet compares white LS-4LIN300 with white LS-4LIT300 on the same aluminium-film application. The source calls the marks indentation pits and also describes scratch visibility; their physical depth is not supplied.
The proposed camera observes a stationary region under one oblique light. Motion transport, tension control and whole-roll scanning remain separate engineering choices.
Why it works
- 1
A local change in surface slope redirects a directional reflection. Choosing another illumination angle can separate the disturbed region from the surrounding film.
- 2
The source comparison demonstrates contrast, not calibrated height or a material-thickness measurement.
Lighting application-lab image sheet
Evidence you can inspect
The oblique-light image shows more visible local surface disturbance inside the source annotation.
The source describes indentation-pit/scratch visibility with oblique illumination; no depth, minimum size or measured detection rate is given.
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
Rotate the mark
Test known acceptable and unacceptable marks at several directions relative to the light.
- 02
Vary film state
Include normal texture, tension, curvature and coating changes.
- 03
Set a visual decision
Measure image contrast and false calls at the required sampling; use a separate height method if depth is the acceptance criterion.
From the demo to your test bench
Parts in this setup
LightTested
LS-4LIT300
Oblique line scan light, 340 x 48 x 75 mm (LS-4LIT300)
White oblique line light named in the source; 340 × 48 × 75 mm housing and 300 × 18 mm emitting area.
$729.00
In proposed setup
LightTested
LS-4LIN300
Natural cooling line scan light, 340 x 48 x 75 mm (LS-4LIN300)
Conventional white line light used in the source comparison.
$729.00
Separate test / alternative
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-KF1628M-ML
16mm, F2.8, 1.1", C-mount, Macro lens (52 mm (-0.25X) to 546 mm (-0.03X)) (LS-KF1628M-ML)
16 mm C-mount macro lens. Its printed 0.1x / 152 mm working-distance pair gives a derived 84.46 × 70.66 mm field on the proposed camera. Confirm focus, coverage and fixture clearance.
$319.00
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 | 84.46 × 70.66 mm derived from printed 0.1x magnification |
| Lens-to-part in proposed scene | 152 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.