Technical Articles

  1. 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.

  2. 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.

  3. Laser Beam Profiling And Infrared Cameras

    This white paper addresses the general need for laser beam profile analysis, describes laser beam analysis instruments, and provides an overview of laser applications, in particular for infrared wavelengths.

  4. Hot Topic: The Promise, Advantages, And Challenges of High-Speed Infrared Cameras

    While IR cameras are nothing new, the latest high-speed variants bring with them new functionality, benefits, and a few limitations. This Q&A seeks to shed light on some of those functions, benefits, and limitations and address some of the key questions often asked about the technology.

  5. PbSe Infrared Detectors: It's Easier To Make A Detector Noise Limited System Than You Think

    The key to making an instrument detector noise limited instead of circuit noise limited is understanding the relationships between signal-to-noise ratio and bias voltage, and between optical frequency chopping and detector noise levels.

  6. Laser Beam Diagnostics In GHz Applications

    It usually is insufficient to rely on one standard measurement technology when working with applications in exotic optical wavelengths and unusually low average powers. This white paper goes through an example of calculating many laser beam diagnostics within high GHz applications.

  7. What To Expect In A Laser Profiling Demonstration

    When asking someone for a laser beam profiling demonstration, it is important to understand what you are asking for and what you should expect. This white paper covers the steps needed to take to set up a demonstration, and what is expected of each party.

  8. Working In The Basement: Measuring Signals Below The Noise Floor With A Lock-In Amplifier

    This article presents the advantages of using lock-in amplifiers for measuring signals below the noise floor, how they work, and available devices from Ophir.

  9. Sensor Fusion Enables Comprehensive Analysis Of Laser Processing In Additive Manufacturing

    This white paper discusses sensor fusion, a process that merges data from numerous sensors to create a more complete understanding of the laser-enabled process.

  10. Laser Illumination For High-Speed Imaging

    An incorrect or poorly lit subject affects the image, regardless of camera system quality. Therefore, the illumination source is just as important as the camera's resolution and sensitivity. See how a laser can be used for illumination in these four high-speed imaging application examples.