CN-122016664-A - Titanium alloy component determination method and system based on spectrometer

CN122016664ACN 122016664 ACN122016664 ACN 122016664ACN-122016664-A

Abstract

The invention discloses a titanium alloy component determination method and system based on a spectrometer, wherein the method comprises the steps of focusing a first laser pulse on the surface of a titanium alloy sample to be detected to generate an initial excitation area, applying a second laser pulse on the initial excitation area after a preset delay time is reached after the first laser pulse is acted, collecting spectral signals emitted by the initial excitation area in at least two different preset polarization analysis directions during the second laser pulse, obtaining polarization resolution spectral data, obtaining characteristic analysis signals of target elements, and calculating the component content of each element in the titanium alloy sample to be detected according to the characteristic analysis signals of each target element. The spectral signals are collected in at least two different preset polarization analysis directions to obtain polarization resolution spectral data, and response signals of the spectral signals in specific polarization direction combinations are calculated to obtain characteristic analysis signals, so that isotropic background radiation and spectral line interference of non-target elements are effectively inhibited in physical principle.

Inventors

ZHENG LI
LIU YILING
XIANG JIAHAO

Assignees

成都市林翔机械设备有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1.A method for measuring titanium alloy components based on a spectrometer is characterized by comprising the following steps: Focusing a first laser pulse on the surface of a titanium alloy sample to be detected, wherein the energy density of the first laser pulse is lower than the ablation threshold value of the titanium alloy, and the first laser pulse is used for generating an initial excitation area on the surface of the sample; After a preset delay time after the first laser pulse acts, a second laser pulse acts on the initial excitation area, wherein the polarization state of the second laser pulse is preset or actively modulated into a selected state; during the action of the second laser pulse, collecting spectral signals emitted by the initial excitation area in at least two different preset polarization analysis directions to obtain polarization resolution spectral data; Processing the polarization resolution spectrum data for each target element, and calculating response signals of the target elements under specific polarization direction combination, so as to obtain characteristic analysis signals of the target elements; and according to the characteristic analysis signals of each target element, calculating to obtain the component content of each element in the titanium alloy sample to be measured.
2. The method for measuring titanium alloy components by using a spectrometer according to claim 1, wherein the polarization state of the second laser pulse is preset to be a fixed linear polarization state.
3. The method for measuring titanium alloy components based on a spectrometer according to claim 1, wherein said at least two different predetermined polarization analysis directions are a first direction and a second direction perpendicular to each other.
4. A method for measuring titanium alloy components based on a spectrometer according to claim 3, wherein said calculating response signals under specific polarization direction combinations comprises calculating characteristic wavelengths of target elements Where the normalized differential signal of the spectral intensity in the first direction and the spectral intensity in the second direction , The said As the characteristic analysis signal, a value is used, wherein, And (3) with The spectral intensities in the first direction and the second direction respectively, Indicating that the pixel is at time Is a time of acquisition of (a).
5. The method for measuring titanium alloy components based on a spectrometer according to claim 4, wherein said calculating component content based on the characteristic analysis signal of each target element comprises the steps of: for each target element, a physical boot quantification factor is constructed Wherein , The signal is analyzed for a characteristic of the target element, The characteristic analysis signals are obtained by calculating characteristic spectral lines of titanium matrix elements according to the same method; Based on the physical boot quantification factor And calculating to obtain the component content of the target element.
6. A method for measuring a titanium alloy component by using a spectrometer according to claim 5, wherein the physical guide quantification factor is obtained by Substituting into the unitary linear calibration equation c=kr+b for calculation, where C is the element content and k and b are coefficients determined by standard sample fitting.
7. The method for measuring titanium alloy components based on a spectrometer according to claim 1, wherein the wavelength of said second laser pulse is tuned to the resonance wavelength of the specific atomic or ionic energy level transition of the target element by using a tunable laser.
8. The method for measuring titanium alloy components based on a spectrometer according to claim 7, wherein the collection of the spectrum signals emitted by the initial excitation area is realized by a polarization analysis device, and the polarization analysis device is arranged in front of an optical path inlet of the spectrometer and performs real-time separation and directional reception on fluorescent signals in different preset polarization directions.
9. The method for measuring titanium alloy components based on a spectrometer according to claim 8, wherein when the polarization analysis device is set to be in two orthogonal directions of 0 DEG and 90 DEG, the fluorescence intensity ratio of the same element in the horizontal polarization state and the fluorescence intensity ratio in the vertical polarization state are synchronously obtained, and the ratio directly reflects the spatial orientation of the transition dipole moment and the symmetry of the local lattice field.
10. A spectrometer-based titanium alloy composition measurement system for performing the spectrometer-based titanium alloy composition measurement method of any one of claims 1 to 9, comprising: The initial excitation module is used for focusing a first laser pulse to act on the surface of the titanium alloy sample to be detected, the energy density of the first laser pulse is lower than the ablation threshold value of the titanium alloy, and the first laser pulse is used for generating an initial excitation area on the surface of the sample; the secondary excitation module is used for acting a second laser pulse on the initial excitation area after a preset delay time after the first laser pulse acts on the secondary excitation module, wherein the polarization state of the second laser pulse is preset or actively modulated into a selected state; The spectrum acquisition module is used for acquiring spectrum signals emitted by the initial excitation area in at least two different preset polarization analysis directions during the action of the second laser pulse to obtain polarization resolution spectrum data; The characteristic analysis module is used for processing the polarization resolution spectrum data aiming at each target element and calculating a response signal of the target element under the combination of specific polarization directions so as to obtain a characteristic analysis signal of the target element; And the component measurement module is used for calculating and obtaining the component content of each element in the titanium alloy sample to be measured according to the characteristic analysis signals of each target element.

Description

Titanium alloy component determination method and system based on spectrometer Technical Field The invention relates to the technical field of material component analysis, in particular to a titanium alloy component determination method and system based on a spectrometer. Background Titanium alloy has become a core material of key rotating parts of aerospace engines, main bearing structures of spacecrafts, biomedical implants and high-end chemical equipment by virtue of excellent specific strength, corrosion resistance, high-temperature resistance and good biocompatibility. The Laser Induced Breakdown Spectroscopy (LIBS) technology is a promising atomic emission spectroscopy analysis technology, which focuses high-energy laser pulses on the surface of a sample to enable trace materials to be gasified instantaneously and form high-temperature plasmas, and analyzes the spectrums which are emitted by the plasmas in the cooling process and have element characteristics to realize qualitative and quantitative analysis of sample elements. However, when the LIBS technology is applied to the component verification and quality screening of the above-mentioned high value-added titanium alloy finished products (such as finished engine blades and surface-treated implants), there are still some problems, for example, the analysis base of the conventional LIBS technology relies on the ablation of a sample by laser to generate plasma, which process inevitably forms micron-scale ablation pits on the surface of the sample, causing permanent physical damage, extremely high equivalent values for single crystal blades of aeroengines and medical implants, extremely demanding structural integrity requirements and not allowing the introduction of any components which may be a source of fatigue cracks, such damage detection mode is unacceptable, although damage can be reduced by reducing laser energy, directly leading to rapid deterioration of signal strength and signal to noise ratio, losing the value of quantitative analysis. In addition, the titanium alloy is not pure metal, the performance of the titanium alloy is regulated and controlled by adding a plurality of elements such as aluminum, vanadium, iron, molybdenum, chromium and the like, the characteristic emission lines of the elements are densely distributed on a spectrogram, and due to the inherent broadening effect of laser plasmas, the line width is increased, serious overlapping and interference occur between the lines of different elements, and the complicated spectrum overlaps background noise, so that the accurate extraction of the net line intensity of a single element becomes extremely difficult, and the method becomes a main technical bottleneck for restricting LIBS to realize high-precision multi-element simultaneous quantitative analysis on the titanium alloy. Therefore, there is a need for a method and a system for measuring titanium alloy components based on a spectrometer to solve the above technical problems. It should be noted that the above information disclosed in this background section is only for understanding the background of the inventive concept and, therefore, it may contain information that does not constitute prior art. Disclosure of Invention The invention aims to solve the problems that in the prior art, due to serious overlapping and interference between spectral lines of different elements, the net spectral line intensity of a single element is difficult to accurately extract, so that component measurement cannot be completed. In order to solve the technical problems, the invention provides a titanium alloy component determination method based on a spectrometer, which comprises the following steps: Focusing a first laser pulse on the surface of a titanium alloy sample to be detected, wherein the energy density of the first laser pulse is lower than the ablation threshold value of the titanium alloy, and the first laser pulse is used for generating an initial excitation area on the surface of the sample; After a preset delay time after the first laser pulse acts, a second laser pulse acts on the initial excitation area, wherein the polarization state of the second laser pulse is preset or actively modulated into a selected state; during the action of the second laser pulse, collecting spectral signals emitted by the initial excitation area in at least two different preset polarization analysis directions to obtain polarization resolution spectral data; Processing the polarization resolution spectrum data for each target element, and calculating response signals of the target elements under specific polarization direction combination, so as to obtain characteristic analysis signals of the target elements; and according to the characteristic analysis signals of each target element, calculating to obtain the component content of each element in the titanium alloy sample to be measured. Further, the polarization state of the second laser pulse is