Ultraviolet-visible spectrum noise reduction comprehensive evaluation parameter and noise reduction method thereof
A technology for comprehensive evaluation of parameters and spectra, which is applied in the field of ultraviolet-visible spectrum water quality detection, can solve the problems of measurement result influence, light intensity jump, measurement absorption spectrum interference, etc., achieve significant denoising effect, small distortion and reproducibility Good results
Pending Publication Date: 2020-11-10
SHANGHAI HENGTONG MARINE EQUIP CO LTD
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Problems solved by technology
The light intensity output by the pulsed xenon lamp will have a non-stationary jump, which is manifested as a sudden pulse interference noise; there are also interference between the various modules of the circuit and power supply noise interference
The anti-ultraviolet silica fiber used in the optical path will interfere with the measurement of the absorption spectrum due to reasons such as fiber cross-section, attenuation of the fiber interface, and uneven core diameter.
The output signal of the miniature spectrometer contains Gaussian white noise, fractal noise, etc., and the spectrometer itself contains inherent types of noise, such as low-frequency background noise caused by stray light and high-frequency noise composed of dark current noise and transfer noise, which will affect the measurement results. have a certain impact
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[0025] The invention will be further explained with reference to the following drawings and specific examples, so that those skilled in the art can better understand the invention and implement it. However, the cited examples should not be taken as a limitation of the invention.
[0026] The absorption spectrum obtained by the ultraviolet-visible absorption measurement system of the invention is a noisy spectrum, which can be expressed in the following form:
[0027] NS i ＝S(t i )+σ·Z i i＝1，2，3，n
[0028] In the expression, NSi represents the noisy spectrum, and S(ti) is the real spectrum, where ti = I / n, σ is the noise level, and z i Is noise. The essence of spectrum denoising is to remove the noise contained in the noisy spectrum and obtain the estimated value s (t i ), so that the mean square error (MSE) can be minimized, and then the purpose of denoising can be achieved.
[0029]
[0030]Here, the mean square error can be used as a criterion to evaluate the denoising effect....
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The invention discloses an ultraviolet-visible spectrum noise reduction comprehensive evaluation parameter and a noise reduction method thereof, and the method comprises the following steps: defininga noise reduction comprehensive evaluation parameter YTA = (MSE.SA) / SNR, wherein the smaller the YTA is, the better the spectrum noise reduction effect is, SA is a spectrum angle, SNR is a signal-to-noise ratio, and MSE is a mean square error; different denoising tools are used for obtaining values of MSE, SA and SNR, multiple sets of noise reduction comprehensive evaluation parameters YTA are obtained through calculation, the multiple sets of noise reduction comprehensive evaluation parameters YTA are compared and output, and the parameter combination of the optimal denoising tool is obtained. The invention has the advantages of fast denoising, small distortion degree and good reproducibility, and can greatly improve the signal-to-noise ratio of signals.
Description
Technical field [0001] The invention relates to the technical field of ultraviolet-visible spectrum water quality detection, in particular to an ultraviolet-visible spectrum noise reduction comprehensive evaluation parameter and a noise reduction method thereof. technical background [0002] Compared with the traditional wet chemical method, the monitoring of water quality parameters by UV-vis spectrometry has the advantages of no need of reagents, environmental friendliness, fast detection speed, and simultaneous multi-parameter detection. However, the validity and accuracy of UV-visible spectrum detection data will be affected by UV-visible spectrum noise. Therefore, the noise treatment of spectral data directly affects the accuracy of water quality data detected by spectral method. The noise sources in the detection of water quality parameters by UV-Vis absorption spectrum mainly include pulse xenon lamp, light path and micro spectrometer. The output light intensity of xenon l...
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Login to View More IPC IPC(8): G06K9/00G01N21/33G01N21/31
CPCG01N21/33G01N21/314G01N2021/3155G06F2218/06
Inventor 魏升慧向晨徐林
Owner SHANGHAI HENGTONG MARINE EQUIP CO LTD