基于红外传感器的核电安全壳内挥发性有机物安全浓度的监测方法

It is difficult to monitor the concentrations of volatile organic compounds (VOCs) quantitively since the response coefficients of VOCs on the infrared sensor are different due to their molecular structures. To solve this issue, an online testing system based on gas chromatography (GC) and infrared sensor is constructed to determine the concentrations of some specific volatile organic compounds in a container. In the online testing system, the correction coefficients of the infrared sensors towards the specific compounds used in the nuclear containment during maintenance, including ethanol, isopropanol, n-butyl alcohol, toluene, xylol and n-undecane, are calculated based on the data obtained on GC and infrared sensor, and the correction coefficients maintain stable in different concentrations. The correction coefficients can be used to correct the data obtained from the infrared sensors. Six main VOCs in the nuclear containment during maintenance are tested with this system, and the correction coefficients of the six VOCs are obtained based on the data from GC and infrared sensor. The concentration of relative chemical can be obtained through multiplying the infrared sensor datum by the correction coefficient. Furthermore, according to the lower explosive limits of VOCs, the VOCs monitoring method in confined space based on infrared sensor is then established.