Portable laser probe component analyzer

Abstract

The invention discloses a portable laser probe component analyzer, which comprises a detection head and a host system. The detection head consists of a shell, an optical fiber collimating mirror and a lens. The host system includes a microcontroller, a portable PC machine, a laser power supply, a spectrometer, a light collector, a dichroic mirror, an optical fiber coupler, a diaphragm and a laser emission head. The laser pulse and collected light are all transmitted through one same optical fiber, thus avoiding a complex optical path system, reducing the detection head volume of the laser probe component analyzer, and enhancing the anti-interference performance and repeatability of the system. By adopting dual pulse excitation, the detection limit can be well reduced, and the signal-to-background ratio and the plasma spectrum stability can be improved. At the same time, small energy laser pulse with a pulse energy of 10-20mJ is employed to excite a sample and improve the analysis accuracy, and large damage to the sample surface can be avoided simultaneously. Upper computer software is employed to control a small displacement platform to realize automated focusing and collection.

Description

technical field [0001] The invention belongs to the technical field of laser precision detection, and specifically relates to a portable laser probe component analyzer (laser probe instrument for short), which is mainly used for qualitative and quantitative analysis of material element components. Background technique [0002] In metallurgy, machinery, energy, chemical industry, environmental protection, food safety, biopharmaceutical and other fields, qualitative or quantitative analysis of material components is often required. At present, the relatively mature analysis methods are: ultraviolet spectrophotometry (UV), atomic absorption method (AAS), atomic fluorescence method (AFS), inductively coupled plasma method (ICP), X-ray fluorescence spectroscopy (XRF), inductively coupled Plasma mass spectrometry (ICP-MS), etc. However, due to the cumbersome sample preparation and long analysis period of these methods, pretreatment of samples is generally required, and the cost o...

AI Technical Summary

Problems solved by technology

[0008] First of all, most traditional LIBS systems use Nd:YAG lasers to build complex optical path systems on optical platforms. The equipment is bulky and has high requirements for the environment where the equipment is placed. For example, a special optical platform is required, and some lasers require constant temperature and dry environments. , so it is impossible to move the instrument to the wild environment or industrial site for analysis;

[0009] Secondly, the current movable LIBS system generally puts the entire laser emitting head into the detection head, so that the volume of the detection head is still relatively large, which brings inconvenience to field detection and industrial field analysis

At the same time, due to the use of a single pulse, the detection limit and accuracy are greatly limited, and it is difficult to detect trace elements

[0010] Third, in order to enhance the plasma spectral intensity, some current LIBS systems often adopt some auxiliary enhancement measures, such as filling shielding gas, evacuating, electric spark or microwave heating, etc. The addition of these auxiliary devices often requires a Special sample room, the size of the sample room greatly limits the size of the target sample, and cannot complete the component analysis of large-sized samples, and cannot perform real-time monitoring on the industrial site

However, the larger laser pulse energy has more severe ablation on the surface of the sample and greater damage to the sample.

[0012] It can be seen that due to various reasons, the existing LIBS system still has many defects: such as relatively large equipment volume, high environmental requirements, analysis accuracy, detection limit, stability and repeatability need to be further improved, and is not suitable for use in harsh environments. Real-time monitoring of field environment or industrial site

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