Methane is a powerful greenhouse gas that traps heat in the atmosphere, and a lot of it escapes from oil and gas pipelines every year. Until now, finding and measuring these invisible leaks was a real challenge for energy companies and regulators. But a team of scientists in Hefei, China may have found a better way.
Professor Zhang Zhirong and his team at the Hefei Institutes of Physical Science have built a laser-based system that can see methane gas clouds in three dimensions. Using a technique called Tunable Diode Laser Absorption Spectroscopy — basically, a special laser that can "sniff out" methane molecules in the air — the device scans an area and builds a 3D picture of where the gas is floating and how much is leaking. The study was published in the journal Environmental Science & Technology.
Older detection tools had big limitations. Many relied on a single sensor that pointed in one direction at a time, making it easy to miss leaks entirely. Wind could also blow the methane away before it was even detected. The new system avoids these problems by scanning continuously and combining its readings with wind data to calculate exactly how fast methane is escaping. The researchers call this the "flux-based inversion method."
The system uses a coaxial transmit-receive optical path design, which simply means the laser sends and receives signals through the same opening. This makes the device more sensitive at long distances and reduces signal loss, allowing it to pick up even tiny, or "micro," leaks that might otherwise go unnoticed.
The team is now applying this technology to help energy companies monitor their pipeline networks more intelligently. Instead of just knowing that a leak exists somewhere, operators can now know exactly where it is and how serious it is in real time.
Methane leakage from pipelines poses both safety risks — because methane is flammable — and climate risks, since it traps heat far more effectively than carbon dioxide over short time periods. Better detection tools like this one could be a meaningful step toward cleaner energy management.