Radiant Source
Incandescent lighting relies on a tungsten filament encased in a small envelope containing a halogen gas to produce a continuous spectrum. Standard halogen illumination provides the broad near-infrared coverage necessary for identifying different fibre types on a conveyor.
Thermal Output
Heat management becomes a factor because these bulbs convert a high percentage of energy into infrared radiation. Excessive halogen illumination might damage delicate synthetic fibres or cause thermal drift in nearby optical sensors. Protective shielding and cooling fans are often integrated into the inspection housing to mitigate these effects.
Spectral Consistency
Stability of the light output ensures that the reflectance data used for material identification remains accurate over long shifts. Variations in halogen illumination can lead to false readings if the system is not regularly calibrated against a white reference tile. Maintaining a constant voltage to the lamps prevents shifts in the colour temperature that would alter the perceived spectral signature of the fabric.
Maintenance Requirement
Service life for these bulbs is typically shorter than for solid state alternatives, requiring a planned replacement schedule to avoid line stoppages. Modern halogen illumination units often feature dual-lamp configurations to provide redundancy during critical production runs. Technicians monitor the total hours of operation to ensure the intensity remains within the specified range for the detection algorithm.
