Glass components carrying crosses, circles or coded fiducials for machine-vision alignment, coordinate registration and assembly inspection.
Fiducials establish a stable reference frame for a part or fixture. They can be combined with functional patterns, identification marks or orientation features on the same substrate. Artwork polarity must match the detection algorithm and lighting.
Choose fiducials for repeatable location, centring and orientation during image registration or optical assembly. Dense field calibration instead calls for a distributed array or grid.
A fiducial supplies a detectable location or orientation; a graduated scale supplies many measurement intervals. Asymmetric marks can resolve orientation that a symmetric cross or circle leaves ambiguous.
Crosses, circles, coded shapes, label fields and multiple marks can be positioned relative to mounting datums and the active optical region.
A patterned glass component with the agreed coating geometry, substrate outline and inspection records.
| Marker geometry | Cross, ring or approved recognition pattern |
|---|---|
| Reference coordinates | Marker locations and orientation relative to the part |
| Detection conditions | Field of view, illumination and polarity |
Inspect feature positions, marker identity and registration to mechanical or optical datums.
Fiducials are recognizable features used to find a centre, direction or coordinate frame. A small set can support image registration or alignment without covering the whole field with a calibration grid. Place them where the camera or operator can observe them after mounting.
Crosses, rings and asymmetric markers provide different cues to a detector. Specify expected image scale, lighting and pattern polarity. A symmetrical marker can locate a centre while leaving orientation ambiguous; an additional asymmetric feature may resolve that ambiguity.
A precisely drawn mark only becomes an assembly reference when its position is tied to a physical datum. Record the relationship between the mark, plate edges or bore, and any functional pattern. Agree whether inspection reports physical-datum coordinates or best-fit coordinates.
| Control item | Information to confirm |
|---|---|
| Geometry and position |
|
| Substrate and optical path | Specify glass grade, thickness, wavelength and illumination side. Review transmission and reflections in the actual optical arrangement. |
| Inspection and acceptance | Inspect feature positions, marker identity and registration to mechanical or optical datums. |
| Drawing and revision | Provide a 1:1 DWG with declared units, clear and opaque layers, viewing direction, active area and the approved revision. |
Alignment features for repeat imaging and fixture registration.
Registration markers for equipment and optical inspection setups.
Supplies a visible registration reference tied to the instrument mounting datum.
Reference marks to align repeated images or slide positions.
Yes. Supply the authorized marker family, IDs, cell size and required quiet zones. The finished pattern must remain detectable under your illumination.
Fiducial-patterned glass supplies marks at defined locations and orientations for optical alignment and coordinate registration.
Define identifiers, positions and coordinate directions together with the mark shape. Keep measured image features linked to physical coordinates.
Mark artwork, identifiers, coordinates, axes, clear field and mounting datums.
Also define its location, identifier and coordinate direction so detected features can be matched to intended positions.