Allied Vision Helps Reset the Speed Barrier for Thin-Film Quality Control in Roll-to-Roll Manufacturing

Why It Matters

Real‑time, full‑width metrology removes blind spots in high‑speed R2R lines, directly boosting production yield and reducing scrap in flexible electronics and battery manufacturing.

Key Takeaways

• First inline imaging‑ellipsometer for roll‑to‑roll lines
• Allied Vision EXO250ZU3 camera enables 75 fps measurement
• Full‑width, real‑time thickness maps improve yield
• Fresnel lens design reduces cost and footprint
• System handles foil widths up to 2 m

Pulse Analysis

Roll‑to‑roll manufacturing has become the backbone of flexible electronics, battery electrodes and next‑generation displays, yet its speed—often exceeding 100 m min⁻¹—has outpaced traditional quality‑control tools. Conventional ellipsometers are confined to laboratories because they require narrow, collimated beams and cannot cover the multi‑meter widths of production foils. The lack of inline, full‑area metrology forces manufacturers to rely on intermittent sampling, which risks undetected process excursions propagating across entire rolls, inflating scrap rates and eroding margins.

The breakthrough stems from a clever optical redesign and a high‑performance polarized sensor. By swapping bulky refractive lenses for large‑aperture Fresnel lenses, TU Wien achieved a compact, low‑cost illumination system that preserves the precise angle‑of‑incidence essential for ellipsometry. Coupled with Allied Vision’s EXO250ZU3 camera—built on Sony’s IMX250MZR sensor, featuring 2448 × 2048 pixels, 3.45 µm pitch and a nanowire polarizer—the system records all four polarization states in a single exposure at 75 frames s⁻¹. The on‑roll geometry suppresses vibration, fixes the illumination angle, and uses a modest LED bandwidth to eliminate interference from backside reflections, delivering nanometer‑scale thickness maps without moving parts.

From a business perspective, the technology promises immediate ROI. Real‑time, full‑width inspection enables early defect rejection, reducing waste and improving yield for high‑value products such as lithium‑ion battery electrodes and transparent conductive films. The modular hardware can be retrofitted to existing lines, scaling linearly with foil width and supporting both nanometer‑thin organic layers and micron‑scale coatings. As manufacturers push toward wider webs—up to two meters—the solution positions Allied Vision and its partners as key enablers of the next wave of flexible‑electronics production, potentially reshaping supply chains and accelerating time‑to‑market for emerging devices.