TELOPS Articles & Applications Notes

  1. Volcanic Eruption Observations From An Elevated Point Of Stromboli Using Thermal Infrared Hyperspectral Imaging

    Scientific research on different indicators of imminent volcanic eruptions is carried out on an ongoing basis, especially with volcanoes that are located close to urban areas. Remote sensing technologies are the preferred method of investigation due to the hazardous and sometimes unpredictable behavior of these volcanoes. The Telops Hyper-Cam has established itself as a reference tool for investigating clouds over large distances, and has illustrated its capabilities by imaging the Stromboli volcano, well known for its periodic eruptions of small magnitude containing various proportions of ash, lava, and gases. This application note highlights the benefits of using standoff infrared hyperspectral imaging for characterizing volcanic process.

  2. Direct Imaging Of Shale Gas Leaks Using Passive Thermal Infrared Hyperspectral Imaging

    Many types of natural gas from shale formations, including methane (CH4), are odorless, colorless, highly flammable, and leaks/emanations are important considerations for safety and the environment. Telops has recently launched the Hyper-Cam Methane, a field-deployable thermal infrared hyperspectral camera specially tuned for detecting methane infrared spectral features under ambient conditions and over large distances. This application note illustrates the benefits of using this imager a site where shale gas leaks unexpectedly happened during a geological survey near the Enfant-Jesus hospital in Quebec City, Canada, during December 2014.

  3. Infrared Imaging For Material Characterization In Fracture Mechanics Experiments

    When developing new materials, the characterization of mechanical properties becomes extremely important. Many different measurements as well as the nature of the material to be characterized dictate what parameters are needed and to what extent. Among the challenges encountered during the characterization of a material’s thermal patterns is the need for both high spatial and temporal resolution. Infrared imaging provides information about surface temperature that can be attributed to the stress response of the material and breaking of chemical bonds. This application note covers the process of performing tensile and shear tests on an variety of materials using high-speed and high-definition infrared imaging.

  4. High-Speed Infrared Imaging For Analysis Of A Diesel Engine Supplied With Premixed Methane-Air Charge

    Engineers are continuously looking to improve the efficiency of internal combustion engines (ICEs) in areas such as lowering fuel consumption and reducing soot formation. Among the strategies used to improve combustion efficiency is the use of premixed air-methane charge in place of the use of air. In order to observe and analyze this technique, an optical engine is used with high-speed infrared imaging. This white paper walks through this experiment and investigates the different phases of the combustion cycle using four different spectral filters in order to see the difference in the exhaust fumes.

  5. Non-Destructive Testing Of Mid-IR Optical Fiber Using Infrared Imaging

    Some materials such as the fluoride and chalcogenide glasses used in the manufacture of optical fiber lasers cannot have any defects in order for the laser system to be efficient. This can be difficult because most existing quality control techniques are not compatible to these materials. To address this problem, a novel non-destructive testing (NDT) methodology has been developed based on infrared imaging. This application note shows how infrared imaging can be used to carry out NDT of optical fiber integrity. The methodology allows the screening of tens of meters in just a few seconds.

  6. FAST Thermal Imaging – Tank/Artillery Muzzle Flash Analysis

    Typical large caliber muzzle flash last less than 0.2 seconds in the MW (3μm to 5μm) band. This fact leads to the most important technological challenge when it comes to the detection and characterization of short, millisecond long events: high frame rate.

  7. Urban Heat Island Characterization With Airborne Thermal Infrared Hyperspectral Imaging

    . This application note discusses how to efficiently characterize urban heat islands using airborne TIR hyperspectral imaging, and to better understand their relationship with man-made materials.

  8. Time-Resolved Multispectral Imaging Of Combustion Reactions

    Most combustion gases selectively absorb/emit infrared radiation over a very narrow spectral range, so spectral filters are used to estimate these parameters and provide selectivity of the combustion gases’ chemical nature. Telops developed a time-resolved multispectral to characterize combustion experiments, and measure temperature profiles. This application note illustrates how the Telops’ MS-IR MW was used to calculate the combustion profile of a lit candle.

  9. Standoff Midwave Infrared Hyperspectral Imaging Of Ship Plumes

    Characterization of ship plumes is very challenging due to the great variety of ships, fuel, and fuel grades, as well as the extent of a gas plume. In this work, imaging of ship plumes from an operating ferry boat was carried out using standoff midwave (3-5 m) infrared hyperspectral imaging. Quantitative chemical imaging of combustion gases was achieved by fitting a radiative transfer model. Combustion efficiency maps and mass flow rates are presented for carbon monoxide (CO) and carbon dioxide (CO2). The results illustrate how valuable information about the combustion process of a ship engine can be successfully obtained using passive hyperspectral remote sensing imaging.

  10. Airborne Thermal Infrared Hyperspectral Imaging For Mineral Mapping

    In order to illustrate the benefits of thermal infrared hyperspectral imaging (HSI) for mineral mapping, an airborne survey was carried out over an open-pit mine in the Thetford Mines (Qc, Canada) area. The results show how high spectral resolution data facilitates temperature emissivity separation (TES) and atmospheric correction in order to retrieve a thermodynamic temperature map of the area and its associated spectral emissivity datacube. Mineral mapping of various minerals such as lizardite, serpentinite, and quartz was achieved through linear unmixing of the emissivity data using reference emissivity curves found in spectral libraries. The results illustrate the potential of TIR HSI for airborne mapping of silicate minerals.