If you are wondering what is nerve gas detection method, well, there are several but the most common ones are laser photoacoustic spectroscopy, Non-dispersive infrared, IR absorption, and Fourier transform infrared spectroscopy. Out of them, laser photoacoustic spectroscopy is the common method of detecting nerve gas in the air. Under this technology, there are three different lasers fixed at three different frequencies to produce different sound waves. These different wavelengths are then sent into a sensor known as the photoacoustic cell where the nerve gas vapors are present. Some nerve agent stimulants that can be identified with this method are DMMP, SEMP, DIMP, Sarin nerve gas, and others.