QOGI Resources

QOGI Validation & Studies

Quantitative Optical Gas Imaging (QOGI) has been evaluated through a range of controlled testing, independent field studies, and internal performance assessments. Together, these efforts help define where image-based gas quantification performs well, where limitations exist, and how results should be interpreted in real-world operating conditions.

Learn more about validation studies and interpretations that support informed use of QOGI across leak detection and repair (LDAR), Measurement-Reporting-Verification (MRV), and emissions management workflows.

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“The FLIR quantitative optical gas imaging (QOGI) system allows surveyors to measure the leak rates for methane and other hydrocarbon emissions without close contact with the gas.”

Dani Urton, Manager, Emissions Management Group, Vertex

“QOGI provides customers with clear visibility of loss mechanisms, allowing them to target repairs effectively and validate the impact of maintenance over time.”

Philippe Lambert, VP Commercial and Service for John Crane

Independent Field & Controlled‑Release Studies

Independent, peer-reviewed studies have confirmed QOGI’s reliability and accuracy. Best results are achieved with proper setup, environmental awareness, and operator training.

Read the article to learn how QOGI is evaluated and how its performance compares to other measurement approaches. You can also click below to explore specific topics.

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An Evaluation of an Optical Gas Imaging System for the Quantification of Fugitive Hydrocarbon Emissions

A controlled-release study showing QOGI’s superior quantification accuracy and reliability compared to Method 21.

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Blind Testing Comparing QL320 to Other Quantitative Technologies

Blind outdoor testing demonstrated QOGI’s robustness and the importance of operator technique for reliable quantification.

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Alberta Methane Field Challenge

Large-scale field trials in Alberta confirmed QOGI’s value for rapid, facility-level emission screening and MRV workflows.

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METEC QOGI Study

Single-blind experiments at METEC validated QOGI’s practical accuracy under realistic field conditions.

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What QOGI Studies Reveal About Real-World Performance

Evaluation Category	What Is Examined	Practical Takeaway	Flir Guidance
Leak Rate Sensitivity	Controlled and variable release rates	QOGI performs best above defined detection thresholds	QOGI is ideal when aligned with common regulatory leak sizes. For the U.S. EPA, this is often referred to as 60 g/h and up.
Distance & Geometry	Standoff distance and viewing angle	Consistent setup improves reliability	Basic understanding of QOGI and reviewing lessons learned create positive results.
Environmental Conditions	Wind, turbulence, thermal contrast	Like all measurement technologies, certain conditions increase measurement uncertainty	Understanding the technology, including how environmental conditions affect results, ensures better results.
Repeatability	Multiple measurements under similar setups	Stable workflows matter more than fine tuning	Using QOGI in camera simplifies workflow and helps create more efficient LDAQ processes.
Comparison Methods	Cross‑checks with other measurement tools	QOGI aligns best when used for comparative or trend analysis	While aggregate measurements increase accuracy, FLIR helps on a per reading basis with the new uncertainty metric per measurement.