Technical Articles

  1. When Lightning And Rods Connect

    There are many challenges associated with recording lightning with high-speed video images, including placing the camera close enough to the chosen structure in an observable way, as well as the filming process requiring a long observation time to capture the strike – if it happens at all. Now, for the first time, a team of researchers has captured lightning striking a rod using Vision Research’s high-speed cameras. The results not only broaden the understanding of how lightning connects with lightning rods, but also provide the field data necessary to improve current lightning protection systems.

  2. The Instrument Transfer Function

    An interferometer is a common instrument for measuring optical surfaces to very high precision that can be applied with care to enable extremely low uncertainty measurements to address tight metrology requirements. The ability of an interferometer to quantify mid-spatial frequency content is defined not only by its sampling density (camera resolution), but also by the many critical design aspects of the optical illumination and imaging system. The instrument transfer function (ITF) quantitatively characterizes the response of the instrument as a function of spatial frequency.

  3. Selecting The Right Hyperspectral Imager Is Key To Bringing Critical Data Into View

    Hyperspectral imaging is a valuable technique for revealing data the eye alone cannot capture. Now, a new class of hyperspectral imaging systems is taking things one step further by addressing image quality issues and enabling further ease-of-use. These features, coupled with their unwavering ability to pick out different characteristics from an image, make hyperspectral imagers highly prized for a range of applications, from studying crime scenes to gather forensic evidence and checking foods for signs of contamination, to precision agriculture using unmanned aerial vehicles (UAVs).

  4. Fiber Optic Sensing

    The two types of sensing include local measurement points and distributed sensing. This paper presents the technical basics behind sensing over fiber technologies, its main applications, and the cabling solutions involved.

  5. Understanding LIDT Laser Optics For High Power Lasers

    To analyze the specific damage characteristics of high power laser optics, it is important to understand the Laser Induced Damage Threshold (LIDT), an analytical threshold determination method that can reveal damage diagnostics, and its testing provides a lower-cost option for coating development. This paper details the different test types of LIDT, how to measure the optical thresholds, how to identify defects within high power lasers, and more.

  6. Why SWIR And InGaAs Are Useful

    Sensing in the shortwave infrared (SWIR) range (wavelengths from 0.9 to 1.7 microns) has been made practical by the development of indium gallium arsenide (InGaAs) sensors. This white paper covers the importance of using InGaAs technologies in SWIR applications.

  7. Understanding Latency In Real-Time Imaging Systems

    Latency performance data helps imaging system designers to determine how quickly a system can process, analyze, and in some applications display images. The lower latencies are critical for applications requiring higher-speed quality inspections, including image-guided surgery, and military systems where end-users need real-time imaging data to make decisions. This paper provides an overview on the constituent elements of latency, and delivers latency test results for image transfer over a GigE Vision link.

  8. Considering High Dynamic Range Global Shutter CMOS Sensors

    CMOS Image sensors with a global shutter(GS)  - used to avoid image degradation caused by rolling shutter (RS) distortion - are ideal for applications including factory automation, UAVs, and automobile advanced driver-assistance systems (ADAS). 

  9. 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.

  10. Reducing Costs And Improving Adherence For Self-Administration Of New Biologics

    3-D 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.