SURAGUS EddyCus TF Inline Non-Contact Sheet Resistance Monitor

Overview

The SURAGUS EddyCus TF Inline Non-Contact Sheet Resistance Monitor is an industrial-grade eddy current-based metrology system engineered for real-time, non-destructive characterization of conductive thin films during high-speed roll-to-roll, wafer-level, or sheet-fed manufacturing processes. Unlike contact-based four-point probe methods, this system operates on the principle of electromagnetic induction: a high-frequency alternating magnetic field generated by the sensor induces eddy currents in the conductive layer; the resulting perturbation in the sensor’s impedance is quantitatively correlated to sheet resistance (R_s), film thickness, and material conductivity—without physical contact or electrical connection. This physics-based approach ensures long-term stability, immunity to surface contamination, and compatibility with dynamic production environments where substrates travel at speeds exceeding 10 m/min. The system is specifically designed for integration into vacuum deposition lines (e.g., sputtering, evaporation, ALD), wet coating processes (slot-die, spray, gravure), thermal treatment (annealing, sintering), and post-processing steps (etching, cleaning, oxidation), delivering traceable, repeatable data directly to MES or SCADA platforms.

Key Features

• Non-contact operation with standoff distance up to 60 mm—enabling measurement over encapsulated layers, fragile substrates, or through protective windows
• High-speed sampling at up to 1000 measurements per second, synchronized to line speed via encoder input or external trigger
• Multi-channel architecture supporting 1–99 independently configurable sensors per system, facilitating cross-web profiling or multi-zone monitoring
• Temperature-compensated electronics ensuring measurement stability across ambient fluctuations (±0.05 %/°C typical drift compensation)
• Robust mechanical design rated for continuous operation in cleanroom ISO Class 5–8 environments and vacuum chambers down to 10⁻⁶ mbar
• Edge-sensitive geometry allowing reliable R_s acquisition within 3 mm of substrate edge—critical for narrow-margin flexible electronics and photovoltaic ribbons

Sample Compatibility & Compliance

The EddyCus TF Inline supports a broad spectrum of conductive and semi-conductive thin-film systems deposited on non-magnetic, non-ferrous substrates including soda-lime glass, PET/PEN foils, silicon wafers (up to 300 mm), aluminum foil, ceramic tiles, and cellulose-based papers. It characterizes not only metallic layers (Cu, Al, Ag, ITO, NiCr) but also doped metal oxides, conductive polymers (PEDOT:PSS), and carbon-based films (graphene, CNT networks). All measurements comply with ASTM F84-22 (Standard Test Method for Sheet Resistance of Semiconductor Materials Using a Collinear Four-Point Probe) *by correlation*, and raw impedance data meets traceability requirements under ISO/IEC 17025 for accredited calibration laboratories. When deployed with EC Control software, the system supports audit-trail-enabled data logging aligned with FDA 21 CFR Part 11 and EU Annex 11 for regulated pharmaceutical and medical device manufacturing environments.

Software & Data Management

The system interfaces natively with industrial automation protocols including OPC UA, Modbus TCP, and EtherNet/IP, enabling direct integration into Siemens PCS7, Rockwell FactoryTalk, or Beckhoff TwinCAT control architectures. SURAGUS provides two complementary software layers: (1) the real-time EC Control suite—delivering live visualization, statistical process control (SPC) charts (X-bar/R, Cpk), alarm thresholds, and CSV/SQL export with timestamped metadata; and (2) the EC Analyze post-processing toolkit, supporting batch trend analysis, spatial mapping (R_s uniformity heatmaps), and correlation modeling between sheet resistance and secondary parameters (e.g., annealing temperature, deposition power). All data archives include full sensor diagnostics, environmental logs (temperature, pressure), and user-accessible calibration certificates.

Applications

This monitor is deployed across semiconductor front-end processing (metal stack qualification on 200/300 mm wafers), flat-panel display manufacturing (ITO uniformity on Gen 8+ glass), photovoltaic production (Ag grid sintering validation on PERC cells), flexible printed electronics (conductive ink drying and curing verification), and advanced packaging (RDL and redistribution layer resistivity monitoring). It further supports R&D applications such as in-situ optimization of sputter target utilization, plasma-enhanced CVD parameter tuning, and electrochemical deposition bath stability assessment. In battery manufacturing, it verifies current collector coating integrity pre-calendering and detects micro-cracks in cathode/anode layers after slurry drying.

FAQ

Does the system require recalibration when switching between different substrate materials?

No—calibration is material-specific but stored in sensor firmware; users select pre-loaded profiles (e.g., “Al on PET”, “Cu on SiO₂”) without hardware adjustment.

Can it measure through insulating layers such as SiO₂ or polymer encapsulation?

Yes—provided the total dielectric thickness is ≤100 µm and the underlying conductor remains electromagnetically coupled to the sensor field.

Is vacuum-compatible cabling and feedthrough included in the standard delivery?

Vacuum-rated coaxial cabling and CF-40 or KF-25 feedthroughs are available as optional accessories, qualified to UHV standards.

How is measurement uncertainty quantified and validated?

Each system ships with NIST-traceable calibration reports; uncertainty budgets (k=2) are provided per application matrix, covering repeatability, temperature drift, and standoff variation.

What level of technical support is offered for MES integration?

SURAGUS provides protocol-specific integration guides, test scripts, and on-site commissioning support—including validation documentation (IQ/OQ) for GxP-regulated facilities.