A Lubricating Oil Metal X-ray Fluorescence Detection and Spectral Preprocessing Method

Abstract

The invention relates to a fluorescence-detecting and spectrum pre-processing method for lubricating oil metal X-rays. The fluorescence-detecting and spectrum pre-processing method comprises the following steps: primary X-ray excitation and control, lubricating oil metal X-ray fluorescence spectrum detection, environment gas regulation, and detected spectrum pre-processing. According to the fluorescence-detecting and spectrum pre-processing method, the optimal excitation voltage and current are determined according to the critical excitation energy of a detected metal component, so that scattering spectrum influences caused by characteristic spectrum of a target material are the smallest, and the characteristic peak type and the energy spectrum with the best strength can be obtained; the performances of the detected whole spectrum and the characteristic spectrum are changed by designing pulse shaping time, pulse width, pulse signal recording time, a quick threshold value, an energy spectrum correction coefficient and the like, so that the requirements of simultaneously recording a strong characteristic peak and a weak characteristic peak are met; the gas environment of a measuring light path is flexibly regulated according to the measuring requirements, so that the accurate measurement on light metal elements in a low-energy-spectrum area is realized; and by adopting background baseline self-adaptive correction based on multi-scale decomposition is adopted, so that the requirements of directly measuring lubricating oil metal of an aero-engine are met.

Description

technical field [0001] The invention relates to a lubricating oil metal X-ray fluorescence detection and spectrum preprocessing method, which can adopt background baseline adaptive correction based on multi-scale decomposition according to the background baseline characteristics of the measurement spectrum, and flexibly adjust the gas environment of the measurement optical path according to the measurement requirements , to achieve accurate measurement of light metal elements in the low energy spectrum region. Background technique [0002] During the wear process of the aero-engine, the metal wear debris produced can easily cause a certain degree of damage to the aero-engine. At present, the detection of aero-engine lubricating oil wear metals is mainly through on-site sampling, and pretreatment of the samples, and then testing with measuring instruments. Existing commonly used lubricating oil metal detection methods include atomic absorption method, plasma emission spectro...

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Problems solved by technology

[0006] (3) Affected by oxygen in the air, etc., the excitation lines of light metals contained in lubricating oil are easily absorbed and difficult to be detected;

[0007] (4) Commonly used detection methods require pretreatment of lubricating oil samples such as filtration and drying, and detection instruments such as ferrography can only analyze some metal components such as iron

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