Resource Library

We have developed this library of resources to provide access to the tremendous amount of content that we have developed over the years. It includes product-specific literature, application-based technical resources, and media presentations of our unique technologies.

If you know which specific product or application you’re looking for, simply click on that link below and you’ll find in-depth content. Alternatively, you can use the search function to connect you to literature and media related to your specific interest.

Published Papers

Title
Product Area
Return Loss Measurement in the Presence of Variable Insertion Loss Using Optical Frequency Domain Reflectometry
  • Optical Test
Short Summary
The capability of measuring localized insertion loss using OFDR presents a unique opportunity to provide consistent
measurements of device RL even in the presence of variable connector loss, even for short lead lengths. This paper outlines the methodology used to establish a value for the scatter in optical fiber, and how this Rayleigh scatter level is used to maintain consistent reflection measurements.
Abstract

The high spatial resolution and high sensitivity inherent to optical frequency domain reflectometery enables precise measurements of distributed insertion loss and return loss events. The ability to compensate return loss for variable insertion loss greatly adds to the accuracy and practicality of measurements. Further, the capability of measuring the Rayleigh backscatter internal to the instrument provides a stable power calibration artifact.

Citation
S. Kreger et al., “Return Loss Measurement in the Presence of Variable Insertion Loss Using Optical Frequency Domain Reflectometry,” NIST SPECIAL PUBLICATION SP, 2006, 1055, 18.
Self-Calibrating Binary Polarization Analyzer
  • Polarization
Small Scale Crack Growth Sensor
Test Method for Monitoring Atmospheric Corrosion Rate by Electrochemical Measurements
Three-Axis Distributed Fiber Optic Strain Measurement in 3D Woven Composite Structures
  • ODiSI/HD-FOS
Short Summary
In the present application optical fiber for distributed sensing was embedded on a commercial weaving loom and used for three-axis strain measurement and subsequent spatial frequency analysis.
Abstract

Recent advancements in composite materials technologies have broken further from traditional designs and require advanced instrumentation and analysis capabilities. Success or failure is highly dependent on design analysis and manufacturing processes. By monitoring smart structures throughout manufacturing and service life, residual and operational stresses can be assessed and structural integrity maintained. Composite smart structures can be manufactured by integrating fiber optic sensors into existing composite materials processes such as ply layup, filament winding and three-dimensional weaving. In this work optical fiber was integrated into 3D woven composite parts at a commercial woven products manufacturing facility. The fiber was then used to monitor the structures during a VARTM manufacturing process, and subsequent static and dynamic testing. Low cost telecommunications-grade optical fiber acts as the sensor using a high resolution commercial Optical Frequency Domain Reflectometer (OFDR) system providing distributed strain measurement at spatial resolutions as low as 2mm. Strain measurements using the optical fiber sensors are correlated to resistive strain gage measurements during static structural loading.

Citation
M.A. Castellucci, S. Klute, E.M. Lally, M.E. Froggatt, D. Lowry. Three-Axis Distributed Fiber Optic Strain Measurement in 3D Woven Composite Structures, SPIE Smart Structures 2013
Tomographic Inspection of Fiber Coils Using Optical Coherence Tomography
  • Polarization
Waveplate Analyzer using Binary Magneto-optic Rotators
  • Polarization
Wireless, Non-invasive, Asset Life-cycle Monitoring System