Rapid peak searching method for online gas chromatographic peak

Abstract

The invention discloses a rapid peak searching method for an online gas chromatographic peak, which comprises the following steps: calibrating a peak searching interval by using a standard gas, and taking out a chromatographic signal in the peak searching interval; smoothing the chromatographic signal by adopting a central sliding mean filtering method, and filtering burrs and noise; selecting thedata point with the maximum numerical value as a preset peak top point; determining a peak starting point and a peak ending point; calculating and processing data points on the left side and the right side of the preset peak point respectively; and setting a proper window width, sliding leftwards by taking a preset peak top point as a starting point, continuing to slide leftwards if the value inthe window meets a monotonous rising trend until the condition is not met, determining the first point of the first window which does not meet the condition as the peak starting point, similarly determining a peak end point, and finishing peak searching. The peak searching method disclosed by the invention can be used for rapidly and accurately searching peaks, and the accuracy and the real-time performance of the online gas chromatograph for measuring the components and the concentration are improved.

Description

technical field [0001] The invention belongs to the technical field of signal processing of a chromatograph measurement system, and relates to an accurate and rapid peak-seeking method for a single peak of an online gas chromatography peak. Background technique [0002] On-line gas chromatograph is an instrument that continuously monitors the composition and concentration of volatile organic compounds in the atmosphere. The measurement principle is that if there is a certain component in the gas entering the instrument, the peak will appear at the corresponding time point, and the concentration of the component can be calculated by the peak area. Since the chromatograph operates periodically, in order to closely monitor the components in the atmosphere, the cycle period must be as short as possible, so a high-precision and fast peak-finding algorithm is very important to improve the performance of the chromatograph. [0003] At present, the peak-finding algorithms mainly in...

AI Technical Summary

Problems solved by technology

The direct peak-finding algorithm and the half-peak detection algorithm have low computational complexity and short response time, but their anti-noise performance is poor, so they are not suitable for chromatographic peak-finding in complex engineering environments; The peak accuracy is limited; the Gaussian fitting algorithm and the polynomial fitting algorithm have high peak-finding accuracy, but they have strict requirements on the spectrum type; although the genetic algorithm can improve the peak-finding accuracy, it takes a long training time to determine the parameters in the parameters. suitable for real-time computing

[0004] Based on the above reasons, the existing peak-finding algorithm is not suitable for peak-finding of online gas chromatograph

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