Method of infrared spectrometric measurement of tunnel gas

A method of infrared spectrometric measurement of tunnel gas, comprising:

• a step S10, providing a gas measurement system comprising a gas collection unit, a gas analysis unit, and a positioning indication unit in a tunnel, and connecting the gas collection unit to the gas analysis unit;
• a step S20, starting the positioning indication unit to emit a plurality of laser beams onto a wall of the tunnel space in the tunnel to form a plurality of laser spots on the wall, the laser beams and the laser spots employed to divide a tunnel space of the tunnel into a plurality of detection regions, each having a shape of circular sector;
• a step S30, selecting one of the detection regions as a target detection region, the gas collection unit sampling and transferring the gas in the target detection region to the gas analysis unit;
• a step S40, employing the gas analysis unit to analyze the gas from the gas collection unit, the gas analysis unit comprising a spectrometer and an analysis computer, the spectrometer being a mobile gas Fourier transformation Infrared spectrometer (FTIR) and electrically connected to the analysis computer provided with a display function, the spectrometer being controlled by the analysis computer to operate, the spectrometer having a connection port for connecting the gas collection unit to receive and detect the gas in the target detection region to generate and transmit a spectrum analysis data to the analysis computer;
• a step S50, employing the analysis computer to analyze the gas in the target detection region based on the spectrum analysis data to generate and display an analysis result;
• a step S60, determining whether all of the detection regions are analyzed and completed or not, if any detection region not analyzed, returning back to the step S30 and selecting another detection region as the target detection region for analysis;
• and
• a step S70, ending up the operation of the method infrared spectrometric measurement of tunnel gas,
• wherein the analysis result comprises a data and a figure for indicating a sort and concentration of the gas in the detection region.