Water quality detection system

A water quality detection system, comprising:

• a light source, configured to emit a plurality of excitation light pulse trains to a to-be-detected water sample in a time division manner, to generate fluorescence, wherein each excitation light pulse train in the plurality of excitation light pulse trains corresponds to a different wavelength, and each excitation light pulse train corresponds to a respective generated fluorescence;
• a reflector disposed along a shortest virtual line between the light source and the to-be-detected water sample, wherein the plurality of excitation light pulse trains are emitted into the to-be-detected water sample through the reflector;
• a spectrometer, configured to:
• for each excitation light pulse trains in the plurality of excitation light pulse trains, receive the fluorescence corresponding to the respective excitation light pulse train after the fluorescence passes through the reflector;
• and
• output a fluorescence spectrum based on fluorescence generated by the plurality of excitation light pulse trains;
• and
• a data processor, configured to identify the to-be-detected water sample based on the fluorescence spectrum, and obtain a parameter of the to-be-detected water sample;
• wherein for each two sequential excitation light pulse trains in the plurality of excitation light pulse trains, a time interval Δt between a cutoff time of emitting an earlier excitation light pulse train corresponding to a first wavelength and a start time of emitting a later excitation light pulse train corresponding to a second wavelength is 100 ms to 1 s;
• and
• wherein a wavelength difference between each two sequential excitation light pulse trains emitted by the light source to the to-be-detected water sample Δt is 5 nm to 30 nm.