Ultraviolet differential optical absorption spectroscopy (uv-doas) and open path (op) based long-distance detection device for chlorine gas, and method

An ultraviolet differential optical absorption spectroscopy (UV-DOAS) and open path (OP) based long-distance detection device for a chlorine gas, comprising:

• an ultraviolet (UV) light source, a UV focusing module, a reference gas cell module, a multi-point corner cube retroreflector (CCR) array, a UV spectrometer, and a processor, wherein
• the UV light source is configured to generate UV light, and project the UV light to the UV focusing module and the UV spectrometer;
• the UV focusing module is configured to focus the UV light, and project resulting collimated UV light to the reference gas cell module and the multi-point CCR array;
• the reference gas cell module is filled with an environmental gas;
• and the reference gas cell module is configured to reflect collimated UV light penetrating the environmental gas to the UV spectrometer;
• a to-be-detected chlorine gas is located between the UV focusing module and the multi-point CCR array;
• and the multi-point CCR array is configured to reflect collimated UV light penetrating the to-be-detected chlorine gas to the UV spectrometer;
• the UV spectrometer is configured to generate a first absorption spectrogram for the UV light, a second absorption spectrogram for the collimated UV light penetrating the environmental gas, and a third absorption spectrogram for the collimated UV light penetrating the to-be-detected chlorine gas;
• and
• the processor is in communication connection with the UV spectrometer;
• and the processor is configured to perform calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain an absorption spectrogram for reference for concentration calculation, extract a characteristic parameter of the absorption spectrogram for reference for concentration calculation, and compare the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter of a standard absorption spectrogram for each of standard chlorine gases of different concentrations to determine a concentration of the to-be-detected chlorine gas, wherein the characteristic parameter comprises a waveform, a wavelength width, and a peak value of each absorption peak.