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.

Drawings

Title
Product Area
Drawing - 1x4 Coupler Box
  • HYPERION/FBGs
Drawing - Connector Protection Fitting Kit
  • HYPERION/FBGs
Drawing - os3110 Strain Gage Drawing
  • HYPERION/FBGs
Drawing - os5100
  • HYPERION/FBGs
Drawing - si155 HYPERION
  • HYPERION/FBGs
Drawing - si155 OEM, Flat Heat Sink
  • HYPERION/FBGs
Drawing - si255 Rack Mount Shelf Kit
  • HYPERION/FBGs
Drawing - Weatherproof Connector Protection Fitting Assembly
  • HYPERION/FBGs
Drawing os3150
  • HYPERION/FBGs
Drawing os7510
  • HYPERION/FBGs
Drawing os7520
  • HYPERION/FBGs
FFP-TF-Dip-Pin-Drawing
  • Lasers and Tunable Filters
FFP-TF-Side-Terminals-Drawing
  • Lasers and Tunable Filters
FFP-TF2-Drawing
  • Lasers and Tunable Filters
HSC50yn Compact Industrial Sensor Drawing
  • Terahertz
os3155 Drawing - Rugged Strain Gage with Temperature Compensation
  • HYPERION/FBGs
os4210 Assembly Drawing
  • HYPERION/FBGs
os4310 Assembly Drawing
  • HYPERION/FBGs
os4310 Drawing - Non-metallic Temperature Probe - Single Ended
  • HYPERION/FBGs
os4330 Assembly - Epoxy Mount - Drawing
  • HYPERION/FBGs
os4350 Assembly - Armored Cable Flange - Drawing
  • HYPERION/FBGs
os5000 Drawing - Displacement Gage
  • HYPERION/FBGs
os5100 Drawing - Displacement Gage
  • HYPERION/FBGs
os5500 Drawing - Long Range Displacement Gage
  • HYPERION/FBGs
os7100 Drawing - 1D Accelerometer
  • HYPERION/FBGs
os7100 Drawing - 1x3 Coupler Box
  • HYPERION/FBGs
os7100 Drawing - Triaxial Mounting Block
  • HYPERION/FBGs
si155 HYPERION Drawing
  • HYPERION/FBGs
Short Summary
si155, drawing, HYPERION
si255 HYPERION Drawing
  • HYPERION/FBGs
sm125v1 Drawing
  • HYPERION/FBGs
sm125v2 Drawing
  • HYPERION/FBGs
sm130 Drawing
  • HYPERION/FBGs
Triaxial Mount
  • HYPERION/FBGs

Published Papers

Title
Product Area
A Non-Halogenated Flame Retardant Additive for Pultrusion
A Novel Method for Determining and Improving the Quality of a Quadrupolar Fiber Gyro Coil under Temperature Variations
  • Optical Modules
A Novel Non-Halogenated Flame Retardant for Composite Materials
Accuracy and Survivability of Distributed Fiber Optic Temperature Sensors
  • ODiSI/HD-FOS
Short Summary
Describes tests and results associated with temperature coefficients of fiber sensors.
Abstract

Obtaining a high accuracy, high spatial resolution temperature profile of critical test artifacts and test components has long been the holy grail of temperature sensing. Optical Frequency-Domain Reflectometry (OFDR) facilitates the use of unaltered optical fiber as high resolution distributed temperature sensors. Coating selection is a major parameter to consider in determining the best sensor choice based on the operating environment, especially the temperature range. We assess the performance of several fiber sensor coatings for the purpose of converging to the best sensor option for the -40°C to 200°C range. Stripped and carbon coated fiber maintain uniformity through the temperature cycles, resulting in accuracies of +/-0.5°C. A packaged fiber sensor was also held at 551°C for 3000 hrs to measure its performance over time. The survivability and accuracy of fiber sensors at high temperatures provide clear advantages compared to single point thermocouples in terms of displaying localized temperature variations.

Accurate measurements of circular and residual linear birefringences of spun fibers using binary polarization rotators
  • Polarization
Accurate Method for Measuring the ThermalCoefficient of Group Birefringence of Polarization-Maintaining Fibers
  • Polarization
Additively Manufactured Components with Embedded Instrumentation
  • ODiSI/HD-FOS
Abstract

Additively manufactured components enable complex structures to be rapidly fabricated and tested for use in the automotive and aerospace industries. Additive manufacturing capabilities have expanded to include a variety of plastics, metal alloys, and fiber-reinforced polymers. Luna Innovations has developed and demonstrated methods to embed high definition fiber optic sensing (HD-FOS) technology into components that have been additively manufactured using ABS plastic as well as a cobalt chrome alloy.

Citation
• Davis, Matthew, Middendorf, John, Garg, Naman, Ohanian, O. John. "Additively Manufactured Components with Embedded Instrumentation." ASME International Mechanical Engineering Congress and Exposition, November 11-17, 2016. Phoenix, AZ. IMECE2016-66697
Automatic Maximum–Minimum Search Method for Accurate PDL and DOP Characterization
  • Polarization
  • Optical Test
Complete Characterization of Polarization-Maintaining Fibers Using Distributed Polarization Analysis
  • Polarization
  • Optical Test
Defect Detection during Manufacture of composite Wind Turbine Blade with embedded fiber optic distributed strain sensor
  • ODiSI/HD-FOS
Short Summary
We present results from using optical frequency domain reflectometry for high-density distributed fiber optic measurement of strain in a composite wind blade during dynamic fatigue testing. This work illustrates the potential of distributed fiber optic strain measurement for early defect detection in large-scale composite structural health monitoring.
Abstract

High resolution fiber optic strain sensing is used to monitor the distributed strain throughout the manufacturing process of a 9-meter wind turbine blade with intentionally introduced defects.  Standard telecommunications-grade optical fiber was embedded in several layers of the carbon fiber spar cap and used to sense distributed strain during the VARTM process.  The amplitude and phase of the light reflected from the fibers are measured using a commercial optical frequency domain reflectometer (OFDR). Changes in the amplitude and phase of the backscattered light were measured to determine the strain along the entire length of the spar cap with 5 millimeter resolution.  Distributed strain measurements throughout the depth of the spar cap provide valuable information at intermediate points in the manufacturing process which elucidate defects both prior to and during infusion.  The embedded sensors will subsequently be used to measure strain during fatigue testing of the blade to provide a cradle-to-grave method for non-destructive testing of composite structures.

Citation
S. M. Klute et al., “Defect Detection During Manufacture of Composite Wind Turbine Blade with Embedded Fiber Optic Distributed Strain Sensor,” 43rd Proc. International SAMPE Tech. Conf, Ft. Worth, TX, 2011.
Embedded and Surface Mounted Fiber Optic Sensors Detect Manufacturing Defects and Accumulated Damage as A Wind Turbine Blade is Cycled to Failure
  • ODiSI/HD-FOS
Short Summary
High resolution fiber optic strain sensing is used to monitor the distributed strain during fatigue testing of a 9-meter CX-100 wind turbine blade with intentionally introduced defects.
Abstract

High resolution fiber optic strain sensing is used to monitor the distributed strain during fatigue testing of a 9-meter CX-100 wind turbine blade with intentionally introduced defects.  Commercially available telecommunications-grade optical fiber was embedded in several layers of the carbon fiber spar cap and surface mounted along the spar cap and leading edges of the finished blade.  The amplitude and phase of the light reflected from the fibers are measured using a commercial Optical Frequency Domain Reflectometer (OFDR). Changes in the amplitude and phase of the backscattered light are used to determine the strain along the entire length of the fiber with 2.5 millimeter spatial resolution.  Distributed strain measurements throughout the depth of the spar cap provide an unprecedented view into the strain field within a composite wind turbine blade with defects during fatigue testing to failure.  

Citation
J. R. Pedrazzani et al., “Embedded and Surface Mounted Fiber Optics Sensors Detect Manufacturing Defects and Accumulated Damage as a Wind Turbine Blade is Cycled to Failure” SAMPE Tech. Conf. Proc.: Emerging Opportunities: Materials and Process Solutions, Baltimore, MD, 2012.
High Accuracy Polarization Measurements using Binary Polarization Rotators
  • Polarization
  • Optical Test
High resolution optical frequency domain reflectometry for characterization of components and assemblies
  • Optical Test
Short Summary
In this report we describe a method for polarization diverse OFDR that achieves, to the best of our knowledge, the highest reported combination of length and resolution.
Abstract

We describe a technique for polarization sensitive optical frequency domain reflectometry (OFDR) that achieves 22 micrometer two-point spatial resolution over 35 meters of optical length with -97 dB sensitivity in a single measurement taking only seconds. We demonstrate OFDR’s versatility in both time- and frequency-domain metrology by analyzing a fiber Bragg grating (FBG) in both the spectral and impulse response domains. We also demonstrate how a polarization diversity receiver can be used in an OFDR system to track changes in the polarization state of light propagating through a birefringent component.

Citation
B. Soller, D. Gifford, M. Wolfe, and M. Froggatt, "High resolution optical frequency domain reflectometry for characterization of components and assemblies," Opt. Express 13, 666-674 (2005).
High-Speed and Highly Repeatable Polarization-State Analyzer for 40-Gb/s System Performance Monitoring
  • Polarization
Highly repeatable all-solid-state polarization-state generator
  • Polarization
Improved Fast Scanning Delay Line in Optical Coherence Tomography Applications Utilizing Fiber Stretcher
  • Polarization
In-situ Monitoring and Control of Induction Welding in Thermoplastic Composites Using High Definition Fiber Optic Sensors
  • ODiSI/HD-FOS
Abstract

This paper presents a novel method for providing temperature feedback to the control system of an induction welder during the joining of thermoplastic composite components. Thermoplastic composites are attractive due to their ability to be re-heated and melted repeatedly without degrading the strength of the materials. This enables joining components via fusion bonding or welding, bypassing mechanical fasteners or adhesive bonding completely. In order to ensure a successful joint, the relevant process parameters need to be dialed in and controlled, for specific levels and durations. Induction welding has the advantage of applying a very localized heat, minimizing geometrical distortion of the parts being joined. For the induction welding processes, current and pressure are controlled in an effort to achieve the appropriate temperature at the weld surface with sufficient force to join the two components. Thermocouples are the typical sensors used for temperature measurements, but their size prevents them from being accepted as an inclusion in the final part. As a viable alternative, high definition fiber optic sensing (HD-FOS) is explored as a method for providing a temperature measurement every 1.3 mm along the joint. The small form factor of the sensor lends itself to permanent embedding within the final part. In this work, a high-definition fiber optic sensor is used to provide spatially dense temperature measurements within an induction weld. A control scheme is set up to use the sensor’s measurements as feedback to the controller and to adjust the settings accordingly. This functionality is demonstrated in a dynamic thermoplastic weld setup where the sensor is sandwiched in a lap shear joint configuration. The strength of this weld is evaluated after manufacture and correlated to in-situ temperature measurements. It is shown that HD-FOS could significantly benefit the quality of the final composite part by providing spatially resolved in-situ feedback to the control system to insure uniform temperature profiles at the weld zone and proper processing conditions for each production part.