29/03/2024
Radiometry – The basics What is radiometry? The etymology of radiometry links to “radiation” and “measurement”. More precisely, radiometry is the science studying the transport of energy through radiation.The present document aims at presenting a summary of the principal laws of radiometry involved in the understanding of the world surrounding us, as seen through light-sensitive instruments! Among these are the main T...
Technical Note
991.35 Ko
29/03/2024
How to Interpret Images From Infrared Cameras A field campaign. A laboratory testbed. A volcano. Different applications of infrared cameras, but the very same modus operandi. Turn the camera on, point it toward the scene, and get images on the screen. It looks so simple! And the image is even calibrated in real temperature units. Great!Real life conditions are unfortunately a bit more complex. Accurate interpretation of the infrared images...
Technical Note
560.24 Ko
28/03/2024
Direct Imaging of Shale Gas Leaks Using Passive Thermal Infrared Hyperspectral Imaging There are many types of natural gas fields including shale formations that are common especially in the St-Lawrence Valley (Canada). Since methane (CH4), the major component of shale gas, is odorless, colorless and highly flammable, in addition to being a greenhouse gas, methane emanations and/or leaks are important to consider for both safety and environmental reasons.Telops recently launched ...
Application Note
882.93 Ko
28/03/2024
High-Speed Infrared Imaging of a Split-Hopkinson Pressure Bar Experiment In order to illustrate this concept, high-speed infrared imaging was carried out at 13 000 frames per second during a split-Hopkinson pressure bar experiment on a polymer sample at the Structural Impact Laboratory (SIMLab) of the Norwegian University of Science and Technology. The results illustrate how high-speed infrared imaging can provide detailed information about the thermal properties of...
Application Note
592.99 Ko
28/03/2024
Volcanic Eruption Observations from an Elevated Point of Stromboli Using Thermal Infrared Hyperspectral Imaging The Stromboli volcano is well known for its periodic eruptions of small magnitude containing various proportions of ash, lava and gases. Imaging was carried out at a relatively high spectral and spatial resolution before and during eruptions from the North-East crater. Both sulfur dioxide (SO2) and silicon tetrafluoride (SiF4) could be successfully identified within the volcano’s plume from the...
Application Note
590.9 Ko
28/03/2024
High-Speed Infrared Imaging of Metal Parts Fabrication by Additive Manufacturing Additive manufacturing, also known as 3D printing, is considered by many to be the biggest industrial revolution since the Internet. This method allows rapid fabrication of metal pieces with various compositions, shapes and sizes. However, the extremely high thermal gradients involved in this fabrication process can induce stress and deformation in the materials. In an effort to better understa...
Application Note
617.82 Ko
28/03/2024
High-Speed Infrared Imaging of Crack and Hot-Spot Formation in a Graphite-Fiber and Epoxy Composite Under Stress The enormous progress made in the three last decades in high-speed thermal imaging have given rise to a wide variety of applications, of which material testing is maybe one of the most prominent. Split-Hopkinson bar experiments can especially benefit from the development of high-speed and high-resolution thermal infrared imaging. When materials are subjected to mechanical stress, rapid changes ...
Application Note
485.41 Ko
28/03/2024
Absolute Temperature and Emissivity Calculation Using a Multispectral Infrared Camera and n-Color TES Image Processing Over the past few years, two-color pyrometry has proven to be a fast and reliable non-invasive method to accurately determine the temperature of materials by overcoming emissivity issues usually encountered by thermal infrared cameras. However, the need for multiple independent cameras makes this method expensive to implement. In this work, a single Telops MS M100k equipped with a fast-rotating...
Application Note
485.41 Ko
28/03/2024
Multispectral Infrared Imaging for In-Process Monitoring of Welding OperationsThermal infrared imaging technology is well suited to monitoring the spatially-varying temperature gradients induced in fabricated metal parts during high-temperature welding processes. This application note demonstrates how Telops multispectral thermal infrared cameras can be used to monitor important welding process characteristics like melt pool geometry and local heating and cooling gradients.
Application Note
787.95 Ko
28/03/2024
Quantification of CO2 Passive Degassing at Sulphur Banks from Kilauea Volcano using thermal Infrared Multispectral Imaging Volcanic carbon dioxide (CO2) emission rates play an important role for assessing volcanic hazards and for constraining the role of magma degassing in the biogeochemical cycle of carbon. Quantification of CO2 emission rates from volcanoes remain challenging, mainly due to the difficulty of measuring volcanic CO2 against the high level of CO2 in the atmosphere. Thermal Infrared (TIR) imaging is ...
Application Note
762.78 Ko
28/03/2024
Thermal Infrared Hyperspectral Imaging for the Detection, Identification, and Quantification of Industrial Stack Gas Emissions Thermal infrared hyperspectral imaging is well suited for the detection, identification, and quantification of industrial stack gas emissions. This application note describes a measurement campaign performed at the Port of Rotterdam with the Telops Hyper-Cam, a commercial high-performance, FTIR-based hyperspectral imaging instrument. Principles of gas detection, quantification, and identificati...
Application Note
448.5 Ko
28/03/2024
Thermal Infrared Hyperspectral Imaging for Visualization and Flow Rates Quantification of Methane Releases Gas leaks present obvious health, safety and environmental risks. In oil and gas companies for instance, constant monitoring is crucial to preserve on-site personnel security and to prevent damage to the installations. The need for a reliable and cost-efficient gas detection system is of prime importance especially when security-threatening situations like gas leaks and emissions occur. Precise...
Application Note
570.25 Ko
28/03/2024
Airborne Quantification of Methane Leaks Safety is a major concern for oil and gas companies as chemicals encountered in their installations can be toxic or presentSafety is a major concern for oil and gas companies as chemicals encountered in their installations can be toxic or presenta high explosion potential. A reliable gas identification and quantification imaging system represents an upgrade to thecurrent gas detection technolog...
Application Note
665.96 Ko
28/03/2024
Analysis of Ballistic Impacts on Composite Materials by Infrared Active Thermography In this study, we investigated the assessment of the damaged area on composites ballistic plates subjected to high velocity impact. The active pulsed thermography technique was used for performing post-mortem analysis of the impacted specimens. Quantitative analysis of the damaged areas shows consistent results with the size of the projectile suggesting high precision of the quantification done...
Application Note
894.4 Ko
28/03/2024
Measurement of Gas Temperature and Concentration Profiles Resulting from Detonation of TNT Using High Speed Hyperspectral Camera The measurement of physical properties of expanding gases in the infrared region following a high-explosive detonation requires cameras having both high framerate and fine spectral resolution. Moreover, an accurate gas model is required to adequately explain and quantify the rapidly-evolving events based on properly-interpreted gas emissivity signatures. To achieve this goal, a Telops MW Fast-M...
Application Note
520.32 Ko