Laser probe analyzer based on aerosolization and resonance excitation

Abstract

The invention discloses a laser probe component analyzer. The laser probe component analyzer comprises a Nd. YAG (neodymium-doped yttrium aluminum garnet) laser system, a wavelength tunable laser system, an aerosolization system, a spectrum collection system and a computer, wherein the aerosolization system is used for producing an aerosol from a solution to be analyzed; the Nd. YAG laser is used for producing a high-energy laser beam and focusing the laser beam on the aerosol to excite plasma flame; the wavelength tunable laser system is used for producing a pumped laser beam with required resonance excitation wavelength and focusing the laser beam on the plasma flame to produce a resonance excitation effect; and the spectrum collection system is used for collecting characteristic spectral signals produced after resonance excitation, converting the spectral signals to electric signals and then transmitting the electric signals to the computer to analyze substance components in the solution. The system can overcome the shortcomings of the prior art, greatly improve the detection sensitivity of an LIBS (laser induced breakdown spectroscopy) technology in detection of trace elements in the solution, achieve the requirements of actual applications in the fields of environmental monitoring and the like and simultaneously perform online precise qualitative and quantitative analysis of substances in a liquid.

Description

technical field [0001] The invention belongs to the technical field of component analysis and detection, and specifically relates to an aerosol-based laser probe component analyzer, which is mainly used for precise definite and quantitative analysis of material components in solutions. Background technique [0002] Laser probe technology, that is, Laser-Induced Breakdown Spectroscopy (LIBS for short) technology, is a new type of atomic emission spectroscopy technology, which uses a high-energy-density laser beam to bombard the analyte to generate plasma. It is a new type of material composition analysis technology that collects and analyzes the characteristic spectrum emitted by the plasma, and then obtains the type and content of the elements contained in the analyzed material. LIBS technology has the advantages of no need for sample pretreatment, simultaneous detection of multiple elements, and online, real-time, and remote detection. It has been widely concerned since its...

AI Technical Summary

Problems solved by technology

However, when using LIBS technology to detect and analyze the elements in the solution, there are still four problems: 1. When the laser is applied to the liquid surface, it is easy to generate liquid sputtering and pollute the optical measurement system; 2. The fluid characteristics of the liquid itself The shock wave generated during the interaction between the laser and the liquid will cause ripples on the liquid surface, affecting the accuracy of the laser focus and focal length, and reducing the repeatability of the test; 3. The sputtering liquid generated after laser excitation will absorb or block the plasma The light emitted by the body affects the accuracy of the detection; 4. The laser pulse will generate bubbles inside the liquid, and these bubbles will change the characteristics of the plasma generated by the laser excitation on the liquid surface

The device is used to analyze the content of elements in liquids, gases and dust particles, and can also monitor environmental water pollution and air pollution online in real time. However, the device still has the following shortcomings: 1. The device has a complex structure and is prone to unpredictable samples. 2. There is no effective restraint control on the generated aerosol, which will cause fluctuations in the breakdown point, resulting in low repeatability and accuracy of the experiment; 3. Cannot overcome the low detection sensitivity of single-pulse LIBS technology problem, it is difficult to be applied in reality

[0005] In short, when the existing LIBS technology analyzes the components in the solution, unfavorable factors such as the volatility and splashing of the solution make the spectral signal extremely unstable and the life of the plasma is greatly shortened.

The repeatability, accuracy and detection sensitivity of the experiment are not high

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