Transparent glass: look for dark inclusions in a bright transmitted field
A directional spot used behind transparent glass produces a bright transmitted field with a small dark feature in the real capture. The sheet calls this “dead pixel” inspection, but the pictured workpiece is glass rather than an active display.
A dark spot is an observed image feature until its physical cause is verified.
Real camera capture
- Proposed light housing (spec)Ø58 × 150.5 mm
- EvidenceReal lighting-lab captures
- Camera (proposed)2448 × 2048 monochrome
- Field (derived proposal)33.78 × 28.26 mm
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
Transparent material can return room reflections, fixture edges and marks on either surface. A small dark feature needs a controlled bright background before it can be evaluated.
How it was solved
The sheet uses white LS-HSL15058 pointed toward the camera through the glass. The printed product envelope is 58 mm diameter and 150.5 mm long, with a 50 mm emitting diameter.
The proposed monochrome camera and macro lens are a bench arrangement, not a reproduction of the unspecified source camera.
Why it works
- 1
Transmitted light makes a light-blocking or redirecting feature darker than the background.
- 2
The source does not identify the feature as an internal inclusion, dust or surface damage. Its physical cause must be established independently.
Lighting application-lab image sheet
Evidence you can inspect
A small dark feature is visible in the supplied bright-field glass image.
The sheet calls the task dead-pixel inspection on transparent glass; no display operation, feature size or confirmed defect origin is given.
A lighting application-lab demonstration. The source supplies no customer deployment, defect-size limit, repeatability study or production false-call data. Proposed camera, lens, field, mounting and spacing are not the original tested system.
From image contrast to a production decision
What to validate on your part
- 01
Establish the feature origin
Use clean reference glass and inspect both surfaces; distinguish dust from a material inclusion.
- 02
Check the transmitted field
Record background uniformity, fixture occlusion and flare at the final aperture.
- 03
Prove the required size
Use known features and a calibrated image scale, then measure false calls on clean parts.
From the demo to your test bench
Parts in this setup
LightTested
LS-HSL15058
50 mm Collimated collector light (LS-HSL15058)
White directional spot used in the source; 58 mm diameter, 150.5 mm length and 50 mm emitting diameter. Requires a compatible constant-current controller.
$449.00
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, 2448 × 2048 pixels, 3.45 µm pixels and C-mount. Proposed for a bench contrast trial; the source does not identify its camera. Requires separate camera power; this NPOE model 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; its printed 0.25x at 150 mm working distance gives a derived 33.78 × 28.26 mm field on the proposed camera. Confirm light coverage and focus on the actual part.
$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, 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
| Lighting evidence | Application-lab source captures |
|---|---|
| Camera and lens | Proposed catalog components; source camera unspecified |
| Proposed field (derived) | 33.78 × 28.26 mm at 0.25x |
| Lens working distance (spec) | 150 mm at the listed magnification |
| Mounting (proposed) | LS-BT-XZ-G-6-6045 · 600 mm station, glass tray and 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. 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. The part geometry is illustrative and is not reconstructed from the camera image. The proposed field is derived from the printed lens magnification and camera pixel dimensions; actual coverage and focus need a bench check. Representative part geometry is illustrative, not reconstructed inspection evidence.
Glass, displays and optics
Related case studies
Glass, displays and optics
Three line-light trials on display glass
Choose a lighting direction on your screen before comparing light output.Proposed light housing (spec)220 × 53 × 121.5 mmExplore the study
Glass, displays and optics
Grid spacing on a glass cover plate
Clear stripes support measurement only after the edge rule and scale are proven.Proposed light housing (spec)74 × 50 × 50 mmExplore the study
Glass, displays and optics
Dark residue on a bright glass field
Prove the difference between unacceptable residue and acceptable background.Proposed light housing (spec)105.5 × 46 × 47 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.
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.