隧洞施工现场二氧化碳分析数据
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通过采集隧洞内二氧化碳气体的检测值（分子量），分析隧洞内单位范围内的气体浓度，实现隧洞施工现场内二氧化碳浓度的预警及报警，保障隧洞内施工人员的人身安全。通过实时上传的监测数据计算出单位范围内气体浓度，实现隧洞现场内有毒气体的预警及报警，具体过程如下： （1）数据采集：实时检测隧洞施工现场的二氧化碳，由于气体分子近红外光谱选择吸收的特性，不同物质分子会选择性吸收一定波长的光，二氧化碳气体在4.26μm红外区有一个吸收峰。 （2）数据处理：根据红外吸收原理与朗伯-比尔定律通过传感器中的光度可计算出二氧化碳浓度，二氧化碳浓度根据A =ε*C*L公式计算隧洞施工现场的二氧化碳浓度；（A为光度，ε为摩尔吸光系数，C为吸光物质浓度，L为吸光溶液的厚度） （3）将上述二氧化碳浓度与系统中预先设置的预警值相比较，实现隧洞现场内二氧化碳浓度的实时预警及报警。 （4）同时可根据采集所得的数据按天、月、年等时间维度进行趋势分析，形成安全报表数据。
By collecting the detection values (related to molecular weight) of carbon dioxide gas in the tunnel and analyzing the gas concentration per unit range in the tunnel, early warning and alarm for carbon dioxide concentration at the tunnel construction site can be implemented to safeguard the personal safety of construction personnel inside the tunnel. Additionally, early warning and alarm for toxic gases at the tunnel construction site can be realized by calculating the gas concentration per unit range from the real-time uploaded monitoring data. The specific process is as follows: (1) Data Collection: Perform real-time detection of carbon dioxide at the tunnel construction site. Based on the characteristic of selective absorption of near-infrared spectra by gas molecules, different substance molecules selectively absorb light of specific wavelengths. The carbon dioxide gas has an absorption peak in the infrared region at 4.26 μm. (2) Data Processing: According to the infrared absorption principle and the Lambert-Beer Law, the carbon dioxide concentration can be calculated from the luminosity detected by the sensor. The carbon dioxide concentration at the tunnel construction site is calculated using the formula A = ε*C*L, where A represents luminosity, ε represents the molar absorption coefficient, C represents the concentration of the light-absorbing substance, and L represents the thickness of the light-absorbing solution. (3) Compare the aforementioned carbon dioxide concentration with the pre-set early warning values in the system to realize real-time early warning and alarm for carbon dioxide concentration at the tunnel construction site. (4) In addition, trend analysis can be conducted on the collected data according to time dimensions such as day, month and year, and safety report data can be generated.
