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Feedback regulation method and system of pulse laser and laser-induced breakdown spectrometer

A pulsed laser and feedback adjustment technology, applied in the field of spectroscopic instruments, can solve the problems of time jitter, large difference in laser pulse energy, large output pulse timing jitter, etc., and achieve the effect of high accuracy and low cost

Pending Publication Date: 2021-07-27
CHENGDU ALIEBN SCI & TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the passive Q-switched mode laser generally has the problems of large timing jitter between output pulses, large uncertainty of pulse interval time, and large energy difference between different laser pulses.
In the working mode of the LIBS instrument, this will lead to serious time jitter between the trigger signals generated by the passive Q-switched mode laser, which cannot ensure accurate trigger timing, thus seriously affecting the stability of the LIBS instrument and the accuracy of the spectrum acquisition results.

Method used

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  • Feedback regulation method and system of pulse laser and laser-induced breakdown spectrometer
  • Feedback regulation method and system of pulse laser and laser-induced breakdown spectrometer
  • Feedback regulation method and system of pulse laser and laser-induced breakdown spectrometer

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Embodiment 1

[0048] Embodiment 1 Feedback regulation method and system of pulsed laser

[0049] The system of this embodiment is as follows: it includes a pulsed laser 1 , a trigger feedback adjustment system 5 and a control system 7 . The pulsed laser 1 is connected to the trigger feedback adjustment system 5 through an optical path, and various optical elements can be arranged on the optical path as required.

[0050] The feedback adjustment system 5 is electrically connected to the control system 7 , and the power supply of the pulsed laser 1 is electrically connected to the control system 7 .

[0051] The trigger feedback adjustment system 5 includes a photoelectric signal conversion module, a signal regulation module and a pulse delay module; the photoelectric signal conversion module is used to perform photoelectric conversion of pulsed laser light; Monitor to determine whether the waveform parameters meet preset requirements, and output a feedback signal to the control system 7; th...

Embodiment 2

[0067] Embodiment 2 laser-induced breakdown spectrometer (LIBS instrument)

[0068] The LIBS instrument of the present embodiment is as figure 2 As shown, it includes the system described in Example 1. Specifically, the LIBS instrument of this embodiment includes: a pulsed laser 1, an imaging system 2, a spectrometer 3, a beam shaping system 4, a trigger feedback adjustment system 5, a signal collection system 6, a control system 7, a sample stage 8 and a chopper 10 .

[0069] The pulse laser 1, the beam shaping system 4, the chopper 10 and the sample stage 8 are sequentially arranged through the first optical path, the beam shaping system 4 can split light to generate a second optical path, and the trigger feedback adjustment system 5 is arranged on the on the second light path.

[0070] In this embodiment, the control system 7 includes a host computer and control software installed in the host computer. The control software is used to adjust the output light energy of th...

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Abstract

The invention belongs to the technical field of optical spectrum instruments, and particularly relates to a feedback regulation method and system of pulse laser and a laser-induced breakdown spectrometer. The feedback regulation method of the pulse laser comprises the following steps of (a) performing photoelectric conversion on the pulse laser to obtain an electric signal, (b) monitoring a waveform parameter of the electric signal, and judging whether the waveform parameter meets a preset requirement or not, (c) when the waveform parameter does not meet the preset requirement, changing the output light energy of the pulse laser in a feedback regulation mode, and when the waveform parameter meets a preset requirement, outputting the electric signal. The invention also provides a system for realizing the method and a laser-induced breakdown spectroscopy (LIBS instrument) based on the system. According to the method, the stability of the pulse laser energy can be improved, so that the pulse laser energy meets the requirements of an LIBS instrument, the miniaturization of the LIBS instrument realized by adopting a low-cost laser is facilitated, and the application value is very high.

Description

technical field [0001] The invention belongs to the technical field of spectroscopic instruments, and in particular relates to a pulse laser feedback adjustment method and system and a laser-induced breakdown spectrometer. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS) is an atomic emission spectrometry technique using laser as the excitation source. With the ability of remote non-contact analysis, this technology has high application value in all walks of life, and has been given great attention in recent years. [0003] In LIBS instruments, plasma excitation and spectrometer triggering are achieved by pulsed laser light. Specifically, the triggering method of the spectrometer is: using a photoelectric cell to respond to a pulsed laser, and then realizing the conversion of an optical signal into an electrical signal, so as to obtain an external triggering electrical signal of the spectrometer. In this process, the intensity of the trigger electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71G01N21/01
CPCG01N21/71G01N21/01G01N2021/0112
Inventor 段忆翔林庆宇杨燕婷
Owner CHENGDU ALIEBN SCI & TECH CO LTD