Material Sensing & Instrumentation
We develop novel process-monitoring systems for industrial application based on our high-speed dielectric sensing technology. We provide measurement service and consulting in related areas of dielectric research including: *High-frequency process sensing and millimeter-scale fault detection. *Broadband complex permittivity and impedance analysis to 12 GHz. *Microwave cavity characterization in low-loss materials to 18 GHz. *Custom microwave cavity manufacture and sales. *TDR and microwave cavity acquisition and analysis software. *General polymer characterization including DSC and FTIR.
- 717 361 1377
- nehager@msi-sensing.com
- 772 Dorsea Road
Lancaster, PA 17601
United States
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Microwave Cavity Characterization
Material Sensing & Instrumentation
Microwave cavity characterization complements TDR Dielectric Spectroscopy in low-loss materials, providing high-resolution permittivity and loss data at specific single frequencies. Since measurements do not change significantly with frequency in low-loss materials (Kramer-Kronig relation) cavity measurement at select frequencies provides a full characterization across the RF/microwave range.
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TDR Structural Health Monitoring
Material Sensing & Instrumentation
MSI Time-Domain-Reflectometry (TDR) Structural-Health Monitoring probes the structural health of a composite part by propagating a fast electrical pulse along a distributed linear sensor which has been fabricated directly in the laminate. The sensor is formed from the native graphite fibers already used in composite manufacture, and constitutes zero defect. Fibers are patterned into a microwave waveguide geometry, or transmission line, and interrogated by a rapid pulse as shown below. Structural faults along the line cause distortions in waveguide geometry, producing reflected pulses similar to radar. Cracking, delamination, disbonds, moisture penetration, marcelling, and strain are all detected by propagation delay, for sensor lengths up to several meters.
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Broadband Dielectric Spectroscopy
Material Sensing & Instrumentation
Broadband Dielectric Spectroscopy is a powerful tool for investigating a variety of dielectric processes for both electrical and non-electrical applications. Also called Impedance Spectroscopy, the measurement separates molecular process on the basis of response time, providing a unique relaxation frequency along with a signature variation with frequency.
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TDR Concrete Cure Monitoring
Material Sensing & Instrumentation
MSI Time-Domain-Reflectometry (TDR) Concrete Cure Monitoring provides a new approach to cure monitoring in concrete and cementitious materials [1-7]. Using an ultrafast pulse and inexpensive capacitance sensor, our TDR system follows rotation of individual chemical states of water participating in the hydration reaction. The system monitors formation of bound-water hydration products, as well as unreacted free-water to form the hydrated state.
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TDR Composite Cure Monitoring
Material Sensing & Instrumentation
MSI Time-Domain-Reflectometry (TDR) Composite Cure Monitoring [1-4] provides a new approach to cure monitoring of advanced polymer composites. Using a high-speed pulse and inexpensive microwave sensor, our TDR system follows rotation of a polar resin molecule, providing real-time information on viscosity and percent cure. Operating in the microwave frequency range, TDR Cure Monitoring provides an alternative between high-frequency fiber-optic methods and low-frequency dielectric methods, combining optical-style precision and miniaturization with electrode-based simplicity and robustness.
