Technical Articles

  1. Understanding The Dynamics Of Droplets And Turbulence

    Turbulent flows laced with particles can be found everywhere, and include fuel droplets in combustion engines, airborne pollen, and water droplets in clouds. Even though they have been studied often, questions still remain that have to do with the particles’ inertia prohibiting them from following turbulence flow, making the Navier-Stokes equations insufficient for solving their equations. This white paper presents a project studying the dynamics of inertial droplets in a turbulent flow in a well-controlled environment. Measurements of droplet size distribution and turbulent dispersion rate in this study are done with interferometric particle imaging (IPI) and phosphorescent tagging techniques.

  2. 3D Machine Vision: One Small Step For Robots, A Giant Leap For Factory Automation

    3D machine vision systems “see,” analyze, and make decisions to meet production requirements of high accuracy, speed, and low maintenance while also being durable enough to withstand factory conditions.

  3. The Evolution Of Ultrafast, Ultra-Precise Beam Steering Techniques For Micro-Material Processing

    When designing micromaterial processing equipment, manufacturers need to consider a complex interplay of factors, such as accurate positioning of lasers for cutting, drilling, scribing, or  marking at the highest rate possible. In many integrated circuits, the required beam accuracies can be staggering. 

  4. Using 6-Axis Hexapod Motion Platforms In Dental Research

    As hexapod motion and positioning platforms become more mainstream technologies, their applications have expanded into medical fields such as dental biomechanics. This article details the use of the HexMeS and highlights the key reasons for choosing hexapod motion systems in dental research applications.

  5. High-Precision Piezomechanic Scanners Improve Laser Control In Ophthalmology

    Vision defects have been successfully corrected with optical glass dating as far back as medieval times, and the first clinical studies investigating surgical methods to “shape” the cornea started in the last century. 

  6. How Ophir-Spiricon Determines The Dynamic Range Of Laser Measurement Products

    This article explains the importance of understanding and stating a dynamic range correctly. This paper also provides insight on how Ophir-Spiricon, a global leader in precision infrared optics and photonics instrumentation, determines its products’ dynamic range properly.

  7. Meeting Optical Needs For Drones

    UAV optics with higher MTF values and lower F# are used more frequently as detectors become larger in size and smaller in pixel size to maximize imaging performance. This article describes the  improvement of lens quality with higher performance levels to ensure that UAVs operate with the highest performance possible.

  8. How To Make Laser Welding And Cutting Affordable And Sustainable

    This article discusses the consequences of poor measurements in more detail, and presents a measurement solution that can help make applications like laser welding and cutting affordable and sustainable.

  9. Precision Of FLEET Velocimetry Using High-Speed CMOS Camera Systems

    Femtosecond laser electronic excitation tagging (FLEET) is an optical measurement technique that permits quantitative velocimetry of unseeded air or nitrogen using a single laser and a single camera. This paper seeks to determine the fundamental precision of the FLEET technique using high-speed complementary metal-oxide semiconductor (CMOS) cameras. 

  10. Development Of Background-Oriented Schlieren For NASA Langley Research Center Ground Test Facilities

    This paper provides an overview of recent wind tunnel tests performed at the NASA Langley Research Center where the Background-Oriented Schlieren (BOS) technique was used to provide information pertaining to flow-field density disturbances. The facilities where the BOS technique was applied included the National Transonic Facility (NTF), Transonic Dynamics Tunnel (TDT), 31-Inch Mach 10 Air Tunnel, 15-Inch Mach 6 High-Temperature Air Tunnel, Rotor Test Cell at the 14×22 Subsonic Tunnel, and a 13-Inch Low-Speed Tunnel.