Calibrating Short Wave Infrared Sensors for Blowroom Contamination Removal
Calibrating short-wave infrared sensors using dynamic dual-band ratioing isolates white polypropylene from cotton lint while preventing false ejection cycles.
InGaAs Line Scan
Sensor Type
Imaging sensors based on indium gallium arsenide detect infrared light to identify hidden defects or foreign materials in moving textile webs. The ingaas line scan operates in the short wave infrared spectrum, which allows it to see through certain dyes or surface finishes that block visible light. This capability is essential.
Inspection Velocity
High speed data acquisition allows the system to capture a continuous image of the fabric as it passes at hundreds of meters per minute. The ingaas line scan processes one row of pixels at a time, building a high resolution map of the entire roll without the motion blur associated with traditional area cameras. It is often positioned after the dryer or before the final winder to provide a final quality check.
Detection Capability
Differences in the infrared absorption of plastic and cotton allow the sensor to flag clear contaminants that are invisible to the naked eye. In dark or heavily patterned fabrics, an ingaas line scan identifies structural flaws like missing picks or broken ends by detecting the heat or light transmission through the gap. The signal processing hardware must be fast enough to trigger a marking system or stop the machine before the defect is wound onto the beam.
Commercial Value
Reducing the volume of defective material sent to the cutting room lowers the overall cost of garment production.