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 using high-speed complementary metal-oxide semiconductor (CMOS) cameras. A comparison of the performance of several different high-speed CMOS camera systems for acquiring FLEET velocimetry data in air and nitrogen free-jet flows is also provided.

  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

    One of the key parameters for understanding how a laser will perform in an application is the spatial intensity distribution. In many industial laser cutting or welding applications, monitoring the beam quality is critical for successful operation. The measurement of the beam can either be made during the design stage of the laser, or it might be more sufficient for continuous real-time monitoring during the laser’s operation. 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. Inspectahire Relies On Optical Gas Imaging For Leak Detection In the Offshore Oil And Gas Industry

    Inspectahire is a company that helps customers manage the safety, profitability, and environmental impacts of their assets through remote visual inspection technologies and solutions. The FLIR’s GFx320 Optical Gas Imaging (OGI) camera is their preferred technology to use when tasked with the detection of fugitive hydrocarbon emissions.

  5. Avoiding Outages With Hydrogen Leak Detection Technology

    A power plant must keep up maintenance of the hydrogen-cooled generators for the safety of its workers and the environment, as well as for efficient operation of the plant. Traditional methods for hydrogen leak detection in a cooling system may be able to find the general area where hydrogen is present, but can be unreliable at finding the source of the leak. The introduction of optical gas imaging cameras has greatly improved the efficiency and performance of leak detection. With the addition of a dedicated thermal imaging camera for CO2 leak detection, utilities now have a way to efficiently find hydrogen leaks while using CO2 as a tracer gas.

  6. Optical Gas Imaging At Jonah Energy: Saving Gas And Money Through Regular OGI Surveys

    The oil and gas industry loses an average of eight million metric tons of methane through gas leaks every year. Although this does not equate to some major methane leaks in the past, such as at the Aliso Canyon natural gas storage facility in 2015, the industry is still faced with how to best find and repair leaks at potential escape points. As an alternative to the industry standard for leak detection and repair, Optical Gas Imaging (OGI) is being used to make surveys easier and more efficient.

  7. FLIR Optical Gas Imaging Cameras Help To Spot Gas Leaks From The Air

    The Al Hosn Shah Gas Processing Plant in Abu Dhabi is a natural gas processing plant that purifies gases by removing certain contaminants in a sweetening process. The gas pipelines and other infrastructures that process sour gases need to be continuously monitored for leaks as the contaminant gases are often dangerous for human exposure. This case study explores the innovative combination of UAV and FLIR optical gas imaging technologies as an efficient way of monitoring vast gas fields from the air.

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

    Thermally characterizing high-speed targets is a challenging task, one that is difficult to undertake with traditional forms of temperature measurement. This Q&A details how next-generation high-speed IR cameras are up to this challenge, pointing out their functions, benefits and limitations.

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

    It is possible to achieve optimal PbSe IR detector operation by choosing the optimal bias voltage, the ideal optical chopping frequency, or a combination of the two. This is possible because these specific values are both instrument and application dependent. The key to making an instrument detector noise limited instead of circuit noise limited is in understanding the relationships between signal-to-noise ratio and bias voltage, and between optical frequency chopping and detector noise levels.

  10. 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.