Hydrogen gas is positioned as a promising energy source due to its lightweight nature, storability, energy density, and environmental friendliness compared to fossil fuels. However, its highly flammable nature necessitates reliable detection methods for leaks and purity assurance. Various hydrogen sensing techniques have been developed, with tunable diode laser absorption spectroscopy (TDLAS) emerging as a promising method. A recent study led by Associate Professor Tatsuo Shiina from Chiba University in Japan introduced an innovative method for precise hydrogen gas measurement using TDLAS. The researchers meticulously controlled pressure and modulation parameters in the TDLAS setup, achieving highly sensitive detection of hydrogen gas. They also implemented a calibration-free technique that enhances adaptability to a wide range of concentrations. By passing laser light through a pressurized gas cell and modulating its wavelength around the target absorption line of hydrogen, they were able to improve the accuracy of measurements. Through simulations and careful analysis, the team identified optimal pressure and modulation parameters for accurate detection of hydrogen concentrations. By utilizing a calibration-free technique and high-pressure gas cell as a reference, the researchers achieved accurate measurements within a wide detection range from 0.01% to 100%, with improved results observed at longer integration times. The system developed by the team can significantly enhance hydrogen detection systems for safety and quality control purposes, enabling broader adoption of hydrogen fuel. This advancement holds practical implications for detecting leakages in hydrogen fuel cell cars and other industrial applications, contributing to the advancement of hydrogen as a clean energy source.