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Development of a radiation-safe CW-THz roll-to-roll monitoring system using UTC-PD emitter and ZBD for industrial metal-particle coatings
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- Authors
- Jin Chul Cho, Soo Cheol Kang, Mugeon Kim, Dong Woo Park, Sungwoo Jo, Eui Su Lee
- Issue Date
- 2026-02
- Citation
- Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, v.65, no.3, pp.1-7
- ISSN
- 0021-4922
- Publisher
- Japan Society of Applied Physics
- Language
- English
- Type
- Journal Article
- Abstract
- We demonstrate a compact, radiation-safe continuous-wave terahertz (THz) system for in-line industrial monitoring. The system integrates a high-efficiency uni-traveling-carrier photodiode emitter and a zero-bias detector into a single robust monitoring system for roll-to-roll manufacturing. Its efficiency was validated by monitoring platinum (Pt) catalyst loading in hydrogen-fuel-cell electrodes. Critically, the THz transmission showed a strong linear correlation with conventional X-ray fluorescence measurements, not only for dried films (R2 = 0.957) but also for the as-coated wet slurry (R2 = 0.804). This result confirms the feasibility of non-destructive, real-time quality control before the energy-intensive drying process, offering a practical solution for material savings and process optimization in advanced manufacturing.
- KSP Keywords
- Advanced Manufacturing, Continuous-wave terahertz, Drying process, In-line, Industrial monitoring, Its efficiency, Linear correlation, Monitoring system, Platinum (Pt) catalyst, Process Optimization, Quality Control