Fastener-head crack appearance: keep the head face visible beneath the washer
A dark line crosses the bright head face in the real fastener capture, below the threaded shank and washer-like hardware. The useful trial is to preserve that local face contrast without confusing a head slot, finish mark or reflection with damage.
Keep the head face visible, then distinguish damage from normal head features.
Real camera capture
- Light in sourceLS-BKL-1298 · white
- EvidenceReal application-lab image
- Imaging kitCamera, lens and fixture proposed
- AcceptanceValidate on representative parts
Explore it in 3D
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. The specimen and lighting angle are representative, not dimensions or settings recovered from the source capture.
Lighting application-lab catalog capture
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 head slot, machining mark and crack-like line can all be dark features on a reflective fastener.
The washer and shank can shade the same face region that the inspection needs to see.
How it was solved
The source identifies the white flat-panel model and labels the application screw-side-crack inspection. It does not document the light position, exposure or source camera.
The panel is catalogued as a backlight, but a silhouette alone would not show this head-face detail. The proposed bench arrangement uses the panel as an off-axis reflected source and must be tested on the actual head geometry.
Why it works
- 1
A broad reflected source can create contrast at a local line or surface change while leaving the head face visible.
- 2
A dark line in an image does not determine crack depth, cause or remaining mechanical strength.
Lighting application-lab catalog capture
Evidence you can inspect
A dark line is visible across the head face below the thread and washer-like hardware.
The source labels the example screw-side-crack inspection and identifies the white LS-BKL-1298.
One source appearance image, without a labelled defect set, crack dimensions, mechanical test or detection statistics. The proposed light angle is not a recovered source setting.
From image contrast to a production decision
What to validate on your part
- 01
Separate normal head features
Include slots, tool marks, finish variation and washer positions from accepted fasteners.
- 02
Use verified damaged samples
Test independently identified head damage close to the required rejection boundary.
- 03
Validate the view and acceptance
Check shadows, rotations and exposure, and retain any required mechanical or other defect-verification method.
From the demo to your test bench
Parts in this setup
LightTested
LS-BKL-1298
50 x 50 mm Back light source (LS-BKL-1298)
White LS-BKL-1298 flat panel explicitly named in the source screw-side-crack example. Printed 50 × 50 mm emitting area and 78 × 64 × 19 mm housing. The source does not give its position; the proposed scene places the panel off axis to view the head face.
$209.00
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
5 MP monochrome global-shutter camera proposed for a contrast trial. Confirm field, sampling, exposure and algorithm on the actual application.Not available in the United States. Available for delivery to other countries.
$819.00
In proposed setup
LensOur pick
LS-FFL-1456
35mm, F2.8, 1.1", C-mount, Macro lens (59 mm (-0.7X) to 150 mm (-0.25X)) (LS-FFL-1456)
Proposed 35 mm C-mount macro lens at its printed 0.25x magnification / 150 mm working-distance pair. The proposed 2448 × 2048 sensor with 3.45 µm pixels gives a derived 33.7824 × 28.2624 mm field; confirm focus, coverage and residual distortion on the real sample.
$339.00
In proposed setup
Camera test stationOur pick
LS-MNT-0097
Camera stand with XZ adjustment and glass tray, height 600 mm (LS-MNT-0097)
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.
$629.00
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
| Tested light | LS-BKL-1298, white |
|---|---|
| Source camera / lens | Not specified in the source image caption; proposed parts below |
| Proposed lens point | 0.25x at 150 mm, printed lens pair |
| Derived proposed field | 33.7824 × 28.2624 mm = sensor dimensions / 0.25x; not a source test field |
| Panel housing (printed) | 78 × 64 × 19 mm |
| Emitting area (printed) | 50 × 50 mm |
| Source light position | Not supplied; off-axis reflected-light arrangement is proposed |
| Mounting (proposed) | LS-MNT-0097; 600 mm column, 600 × 450 mm base, glass tray and two included 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. 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. The specimen and lighting angle are representative, not dimensions or settings recovered 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.