A new device of online detection of dissolved organic matter (DOM) in
water was developed. The optical filter part of the detection system uses the filter disc.
As a monochromator, the rotating disc can produce continuous UV—visible spectrum
in 230 nm to 500 nm. The photoelectric detection device uses a photomultiplier
spectral response ranging from 185 nm to 650 nm, a maximum response at 340nm
wavelength. In the signal processing part, the wavelet entropy based on denoising
algorithm is used to verify that the wavelet analysis method has a good effect of signal
and noise separation for the fluorescent signal.