PCB adhesive under UV: separate material presence from board texture
The supplied UV board captures show bright material contrast on populated electronics. They support a trial for adhesive presence and spread while keeping component appearance, coating and solder reflections in the test.
Identify what fluoresces before deciding what the bright regions mean.
Real camera capture
- Method365 nm UV material contrast
- EvidenceReal application-lab capture
- SetupSource light identified; imaging kit proposed
- AcceptanceValidate on your own parts
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 PCB contains coatings, inks, solder and component bodies that may respond differently under UV.
A bright region can be the desired adhesive, a coating or an unrelated reflection unless the material is validated.
How it was solved
The source provides two separate 365 nm examples: one with a UV bar and one with a UV ring. They do not form a controlled comparison on the same board.
The proposed LS-BS15030-UV365 bar differs from the source bar. Start with one illumination direction and confirm whether more coverage is required before adding another unit.
Why it works
- 1
UV-responsive adhesive can become easier to segment from the board when its emitted spectrum and the camera filter are well chosen.
- 2
The images demonstrate material contrast under the source lighting; they do not identify every bright region as adhesive or quantify coverage.
Lighting application-lab catalog capture
Evidence you can inspect
The first board capture has a blue bright region; the separate ring-lit board has strong bright contrast around components.
The source labels both examples UV adhesive inspection on circuit boards and names their bar and ring lights.
No material formulation, camera filter, threshold, acceptable coverage or cure measurement is given.
From image contrast to a production decision
What to validate on your part
- 01
Measure material response
Compare adhesive, solder mask, conformal coating, markings and flux residue under the selected UV/filter combination.
- 02
Include placement variation
Use populated boards with acceptable adhesive spread as well as known missing and excess deposits.
- 03
Test obscured areas
Check shadows beneath tall components and at the edge of the required bead region.
From the demo to your test bench
Parts in this setup
LightOur pick
LS-BS15030-UV365
140 x 25 mm UV light, UV series (LS-BS15030-UV365)
150 × 30 × 24 mm 365 nm UV bar with 140 × 25 mm luminous area, proposed in place of the different source bar. Begin with one bar; bracket geometry and direction are illustrative.
$109.00
In proposed setup
CameraOur pick
MV-CS050-10GC
Hikrobot MV-CS050-10GC 5MP Area Scan Camera, GigE, IMX264, Color, Basic
5 MP colour global-shutter camera for colour and angle-coded contrast; confirm colour processing and exposure in the trial.
$739.00
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)
Proposed 16 mm C-mount macro lens. The illustration uses its printed 0.1x magnification at 152 mm working distance. The proposed camera sensor gives a derived 84.456 × 70.656 mm field. Confirm field, focus and residual distortion on the actual sample; this is not calibrated measurement accuracy.
$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, 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 | 365 nm UV material contrast |
|---|---|
| Source evidence | Independent bar-lit and ring-lit board examples |
| Proposed bar envelope | 150 × 30 × 24 mm |
| Camera and lens | Source versions not identified; current proposed parts below |
| 3D spacing | Illustrative, to be confirmed on the sample |
| Derived proposed field | 84.456 × 70.656 mm = sensor dimensions / 0.1x; 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.
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.
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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.