CN214472708U - Absorption breakdown spectrum combined measurement system based on three-dimensional adjustable multi-optical-path structure - Google Patents
Absorption breakdown spectrum combined measurement system based on three-dimensional adjustable multi-optical-path structure Download PDFInfo
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- CN214472708U CN214472708U CN202120556637.4U CN202120556637U CN214472708U CN 214472708 U CN214472708 U CN 214472708U CN 202120556637 U CN202120556637 U CN 202120556637U CN 214472708 U CN214472708 U CN 214472708U
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Abstract
The utility model relates to an absorption breakdown spectroscopy combined measurement system based on a three-dimensional adjustable multi-optical-path structure, which comprises a multi-optical-path adjusting device and a detection device; the spectral measurement mechanism includes an Nd: YAG laser, reflector, focusing lens, coupling lens, first spectrometer, light source, immersion optical fiber, second spectrometer and computer; the utility model discloses combine both laser-induced breakdown spectroscopy technique and ultraviolet/visible absorption spectroscopy technique to build measurement system, adopt three-dimensional adjustable many optical pathsThe adjusting device realizes the adjustment of heavy metal, COD, TOC and NO in the solution3High-precision detection of-N and other organic matter parameters, so as to quickly realize qualitative and quantitative analysis of metal elements and on-line measurement of chemical parameters.
Description
Technical Field
The utility model belongs to the technical field of the spectral detection technique and specifically relates to an absorption breakdown spectroscopy combined measurement system based on three-dimensional adjustable many optical paths structure.
Background
Ultraviolet/visible absorption spectrum technology for COD, TOC and NO in water3The detection technology of-N and other organic matters is relatively perfect. In the existing research on the influence of optical path change on liquid component measurement, most cuvettes with different optical path lengths or the number of spacers or two-dimensional structure supports are adopted to realize the control of the optical path, the defects of few optical path numbers, low resolution, complex operation and the like can be selected for a single-optical-path spectrum detection method, the single-optical-path spectrum is used for modeling multi-optical-path nonlinearity and is introduced as a measurement means, the different equivalent absorption coefficients of samples in different optical paths are utilized, the spectrum nonlinearity characteristics of the spectra measured in different optical paths are irrelevant to each other, theoretically, the multi-optical-path spectrum is used for simultaneously participating in modeling, the information of more sample component contents can be provided, and the model performance is better than that of the single-optical-path spectrum modeling. For the spectrum detection method of the two-dimensional structure support, the defect of a single optical path is made up, but the defects of low precision, low efficiency and complex operation exist in the selection of the optimal position of the optical fiber probe, so that the defects of low precision and low experimental efficiency of the spectrum detection result are caused.
The laser-induced breakdown spectroscopy technology has the advantages of rapid and real-time analysis of samples, simultaneous analysis of multiple elements, low sample loss, no need of sample pretreatment, remote non-contact detection, suitability for samples of various forms and the like. At present, a great deal of research is carried out on the detection of heavy metals in aqueous solutions by utilizing the LIBS technology. The ultraviolet/visible absorption spectrum technology makes up the defects of the laser-induced breakdown spectroscopy technology in the aspect of high-precision detection of water quality parameters. Ultraviolet/visible absorption spectrometry for TOC, COD and NO3The detection of water quality parameters such as-N is more mature, purpleThe external visible spectrum is scanned in the full spectrum section of 220-720nm, and the absorption spectra with different wavelengths are obtained by multi-wavelength scanning, so that the distribution of various substances in the water body can be clearly reflected. According to different detection methods, the ultraviolet/visible spectrum water quality analysis parameters mainly include continuous spectrum analysis, multi-wavelength analysis, dual-wavelength analysis, single-wavelength analysis and the like.
The laser-induced breakdown spectroscopy technology can realize the detection of the heavy metal in the liquid, and particularly, a great deal of research on qualitative and quantitative analysis of the heavy metal in the solution is already available. The laser-induced breakdown spectroscopy technology generates plasma by ablating and exciting a substance to be detected through high-energy laser, detects the emission spectrum of the plasma through a spectrometer and a detector, judges the element types by utilizing the characteristic spectral lines of target elements, and determines the element content through the strength of the characteristic spectral lines of the target elements, thereby realizing qualitative and quantitative analysis of the target elements. Because the laser-induced breakdown spectroscopy technology is lack of detection on the content of organic matters in a solution, and the ultraviolet/visible absorption spectroscopy technology is used for detecting COD, TOC and NO in water3The detection of the content of organic matters such as-N and the like is mature. The development process of water quality detection of the ultraviolet/visible absorption spectrum technology is developed from single wave to multi-wave, and finally developed to continuous spectrum analysis, and the corresponding mathematical model is established and selected by means of linear or nonlinear fitting, so that the water quality parameters are accurately predicted.
In order to realize synchronous high-precision on-line measurement of two parameters of inorganic substances and organic substances for water quality. And the comprehensive visualization of the water quality problem is realized. The utility model discloses a spectrum combination technique based on three-dimensional adjustable many optical paths structure builds an on-line measuring system, can realize aquatic heavy metal element and COD, TOC, NO3Comprehensive, accurate and high-precision measurement of water quality parameters such as-N and the like. The system provides a more convenient, accurate and comprehensive method for water quality detection, and has the advantages of high detection capability, more accurate measurement result and higher reliability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an absorption breakdown spectroscopy based on three-dimensional adjustable many optical paths structureA combined measuring system for solving the problem that the prior detecting system can not realize heavy metal elements in water, COD, TOC and NO3The water quality parameters such as-N and the like are comprehensively, accurately and precisely measured.
The utility model discloses a realize like this: an absorption breakdown spectrum combined measurement system based on a three-dimensional adjustable multi-optical-path structure comprises a multi-optical-path adjusting device and a detection device;
the detection device comprises a sample bearing mechanism and a spectrum measuring mechanism, wherein the sample bearing mechanism comprises a container for bearing the liquid to be detected, a funnel positioned above the container and a water pump for pumping the liquid to be detected in the container to the funnel;
the spectral measurement mechanism includes an Nd: YAG laser, reflector, focusing lens, coupling lens, first spectrometer, light source, immersion optical fiber, second spectrometer and computer; and the Nd: the YAG laser is used for emitting pulse laser, the pulse laser passes through the reflector and the focusing lens and then is irradiated on the liquid to be detected flowing between the funnel and the container, and the coupling lens is used for collecting plasma generated by the liquid to be detected under the action of the pulse laser and transmitting the plasma to the first spectrometer through the optical fiber; the light source is used for transmitting the light path to the bottom of the container through the incident optical fiber, the immersion optical fiber is fixed on the multi-optical-path adjusting device, a probe of the immersion optical fiber is immersed in the liquid to be measured, the multi-optical-path adjusting device is used for adjusting the position of the probe of the immersion optical fiber entering the liquid to be measured, the immersion optical fiber is used for transmitting emergent light penetrating the liquid to be measured to the second spectrometer, and the computer analyzes and processes data transmitted by the first spectrometer and the second spectrometer.
The multi-optical-path adjusting device comprises a control mechanism and an adjusting mechanism, wherein the control mechanism comprises a power supply, a motor, a driver, a controller and a metal inductive switch; the power supply provides energy for the controller, the driver and the motor; the controller controls the rotation direction and the rotation speed of the motor through the driver; the adjusting mechanism comprises a base, a sliding ball screw arranged on the base, optical axes positioned on two sides of the sliding ball screw, a sliding block capable of moving along the optical axes and the sliding ball screw, and a clamp fixed on the sliding block.
The clamp is an OM4A-LBE22 type optical fiber bracket and is used for fixing an invasive optical fiber.
The motor controls the movement distance and the movement direction of a sliding block in the adjusting mechanism; the metal inductive switch is used for controlling the switch of the driver, selecting the initial position of the clamp and determining the movement distance and the movement direction of the clamp.
And a storage table is arranged on one side of the clamp and used for placing the container.
The light source is a DH-2000 deuterium-tungsten halogen combined light source, and the emission wavelength of the light source is 215-2000 nm.
And the Nd: the YAG laser emits pulsed laser light with a wavelength of 1064 nm.
The first spectrometer is an ocean optics MAX2500+ spectrometer, and the second spectrometer is an MS5204i spectrometer.
The system combines the ultraviolet/visible absorption spectroscopy technology with the laser-induced breakdown spectroscopy technology. The chemical parameters of organic matters in the solution are measured by utilizing a three-dimensional adjustable multi-optical-path structure to realize an ultraviolet/visible absorption spectrum technology, a DH-2000 halogen light source emits stable spectrum output with the wavelength of 215-2000nm and is transmitted to the solution to be measured in the container through an incident optical fiber, an optical fiber probe is fixed on a three-dimensional adjustable multi-optical-path structure device and is transmitted to an MS5204i spectrometer through an emergent optical fiber, and optical signals collected by the spectrometer are transmitted to a computer with spectral analysis and the spectral data are processed; and carrying out qualitative and quantitative analysis on the heavy metal content of the detected solution by using a laser-induced breakdown spectroscopy technology. YAG pulse laser with emission wavelength of 1064nm is used as a light source, the laser emission pulse laser changes the propagation direction after passing through a reflector, the laser emission pulse laser enters a measured object after passing through a focusing lens, the surface of the measured object is burned by the laser to generate plasma under the natural environment, the plasma is collected by a coupling lens and transmitted to an ocean optics MAX2500+ spectrometer, and finally the spectral data is processed and analyzed by a computer.
The utility model provides a spectrum combination detecting system based on three-dimensional adjustable many optical paths structure, this system can realize the heavy metal to in the aqueous solutionElements and COD, TOC, NO in aqueous solution3Detection of organic matter parameters such as N. Its advantages are the following two aspects:
1. the optimal optical paths corresponding to all parameters in the water quality are different, and in order to realize high-precision measurement of all parameters, a three-dimensional multi-optical-path combined measurement structure is provided. For simultaneously measuring heavy metal elements in the solution and COD, TOC and NO in the solution3The parameters of organic matters such as-N and the like provide a new idea and have wide application prospect in the field of detecting solutions.
2. A combined measuring system of laser-induced breakdown spectroscopy and ultraviolet/visible absorption spectroscopy is provided. The ultraviolet/visible absorption spectrum technology makes up the defects of COD, TOC and NO in the measured solution by the laser-induced breakdown spectroscopy technology3The method has the advantages that the method has the defect of relatively immature organic matter parameters such as-N, the ultraviolet/visible absorption spectrum technology has relatively low measurement precision on the heavy metal in the solution, and the laser-induced breakdown spectroscopy technology makes up the defect of low measurement precision on the heavy metal in the solution.
Drawings
Fig. 1 is a schematic structural diagram of the middle detecting device of the present invention.
Fig. 2 is a schematic structural diagram of the multi-optical path adjusting device of the present invention.
Fig. 3 is a side view of fig. 2.
In the figure: 1. container, 2, funnel, 3, Nd: YAG laser, 4, a reflector, 5, a focusing lens, 6, a coupling lens, 7, a first spectrometer, 8, a light source, 9, an immersion optical fiber, 10, a second spectrometer, 11, a computer, 12, a multi-optical-path adjusting device, 13, a motor, 14, a base, 15, a sliding ball screw rod, 16, an optical axis, 17, a sliding block, 18, a clamp, 19 and a storage table.
Detailed Description
As shown in fig. 1 to 3, the structure of the present invention includes a multi-optical path adjusting device and a detecting device; the detection device comprises a sample bearing mechanism and a spectrum measuring mechanism, wherein the sample bearing mechanism comprises a container 1 for bearing the liquid to be detected, a funnel 2 positioned above the container 1 and a water pump (not shown in the figure) for pumping the liquid to be detected in the container to the funnel 2; the water pump is connected with a hose and is used for conveying the solution to be detected from the container 1 to the funnel 2 to make the solution flow so as to improve the detection sensitivity.
The spectral measurement mechanism includes Nd: YAG laser 3, reflector 4, focusing lens 5, coupling lens 6, first spectrometer 7, light source 8, immersion optical fiber 9, second spectrometer 10 and computer 11; nd: the YAG laser 3 is used to emit pulsed laser light, Nd: the YAG laser 3 emits pulsed laser light having a wavelength of 1064 nm. Pulse laser passes through a reflector 4 and a focusing lens 5 and then is irradiated on the liquid to be measured flowing between the funnel and the container, and a coupling lens 6 is used for collecting plasma generated by the liquid to be measured under the action of the pulse laser and transmitting the plasma to a first spectrometer 7 through an optical fiber; the first spectrometer 7 is an ocean optics MAX2500+ spectrometer. The light source 8 is used for transmitting the light path to the bottom of the container 1 through an incident optical fiber, the light source 8 is a DH-2000 deuterium-tungsten halogen combined light source, and the emission wavelength of the light source 8 is 215-2000 nm. The immersion optical fiber 9 is fixed on the multi-optical path adjusting device 12, the probe of the immersion optical fiber 9 is immersed in the liquid to be measured, the multi-optical path adjusting device 12 is used for adjusting the position of the probe of the immersion optical fiber entering the liquid to be measured, the immersion optical fiber 9 is used for transmitting the emergent light penetrating through the liquid to be measured to the second spectrometer 10, and the second spectrometer 10 is an MS5204i spectrometer. The computer 11 analyzes and processes the data transmitted by the first spectrometer and the second spectrometer.
The multi-optical-path adjusting device 12 comprises a control mechanism and an adjusting mechanism, wherein the control mechanism comprises a power supply, a motor 13, a driver, a controller and a metal inductive switch; the power supply provides energy for the controller, the driver and the motor; the controller controls the rotation direction and the rotation speed of the motor through the driver; the motor controls the movement distance and the movement direction of a sliding block in the adjusting mechanism; the metal inductive switch is used for controlling the switch of the driver, selecting the initial position of the clamp and determining the movement distance and the movement direction of the clamp. The adjusting mechanism comprises a base 14, a sliding ball screw 15 arranged on the base 14, optical axes 16 positioned at two sides of the sliding ball screw 15, a sliding block 17 capable of moving along the optical axes 16 and the sliding ball screw 15, and a clamp 18 fixed on the sliding block 17. The fixture 18 is an OM4A-LBE22 model fiber optic support for holding an invasive optical fiber. One side of the clamp 18 is provided with a storage table 19, the storage table 19 is used for placing the container 1, and the bottom of the storage table is provided with a hole for a light source to penetrate through.
The utility model discloses a YAG pulse laser that emission wavelength is 1064nm is as the light source, the pulse laser that the laser sent changes direction of propagation behind the holophote, act on flowing liquid surface through the focusing lens, under natural environment, the liquid surface can be burnt by the laser and produce plasma, plasma that produces flowing liquid with the coupling lens couples and transmits it to the spectrum appearance through optic fibre, this part adopts ocean optics MAX2500+ spectrum appearance, detection range 200nm-2500nm, spectral resolution is not less than 0.04nm and carries out the collection of data, carry out data analysis and processing with data transmission to the computer after the collection; meanwhile, a DH-2000 deuterium-tungsten halogen combined light source is adopted to continuously output a spectrum to generate a stable spectrum of 215 plus 2000nm, an ultraviolet-resistant optical fiber is utilized to transmit an optical signal to the bottom of a solution to be detected, an immersion type optical fiber probe is fixed on a three-dimensional adjustable multi-optical-path structure device and is used for receiving the optical signal after the transmission of water quality, the three-dimensional adjustment of the optical fiber probe is realized through an adjustment controller, the position of the optical fiber probe is changed to realize multi-optical-path detection, and the received transmission light source is transmitted to an MS5204i spectrometer; and finally, respectively transmitting the electric signals output by the two spectrometers to a computer with software analysis, and finally completing data analysis of the experiment.
Claims (8)
1. An absorption breakdown spectrum combined measurement system based on a three-dimensional adjustable multi-optical-path structure is characterized by comprising a multi-optical-path adjusting device and a detection device;
the detection device comprises a sample bearing mechanism and a spectrum measuring mechanism, wherein the sample bearing mechanism comprises a container for bearing the liquid to be detected, a funnel positioned above the container and a water pump for pumping the liquid to be detected in the container to the funnel;
the spectral measurement mechanism includes an Nd: YAG laser, reflector, focusing lens, coupling lens, first spectrometer, light source, immersion optical fiber, second spectrometer and computer; and the Nd: the YAG laser is used for emitting pulse laser, the pulse laser passes through the reflector and the focusing lens and then is irradiated on the liquid to be detected flowing between the funnel and the container, and the coupling lens is used for collecting plasma generated by the liquid to be detected under the action of the pulse laser and transmitting the plasma to the first spectrometer through the optical fiber; the light source is used for transmitting the light path to the bottom of the container through the incident optical fiber, the immersion optical fiber is fixed on the multi-optical-path adjusting device, a probe of the immersion optical fiber is immersed in the liquid to be measured, the multi-optical-path adjusting device is used for adjusting the position of the probe of the immersion optical fiber entering the liquid to be measured, the immersion optical fiber is used for transmitting emergent light penetrating the liquid to be measured to the second spectrometer, and the computer analyzes and processes data transmitted by the first spectrometer and the second spectrometer.
2. The system according to claim 1, wherein the multi-optical path adjusting device comprises a control mechanism and an adjusting mechanism, the control mechanism comprises a power supply, a motor, a driver, a controller and a metal inductive switch; the power supply provides energy for the controller, the driver and the motor; the controller controls the rotation direction and the rotation speed of the motor through the driver; the adjusting mechanism comprises a base, a sliding ball screw arranged on the base, optical axes positioned on two sides of the sliding ball screw, a sliding block capable of moving along the optical axes and the sliding ball screw, and a clamp fixed on the sliding block.
3. The system of claim 2, wherein the holder is an OM4A-LBE22 type fiber holder for holding an invasive optical fiber.
4. The system of claim 2, wherein the motor controls the distance and direction of movement of a slider in the adjustment mechanism; the metal inductive switch is used for controlling the switch of the driver, selecting the initial position of the clamp and determining the movement distance and the movement direction of the clamp.
5. The system of claim 2, wherein a stand is disposed on one side of the holder, the stand being configured to receive the container.
6. The system of claim 1, wherein the light source is a DH-2000 deuterium-tungsten halogen combined light source, and the emission wavelength of the light source is 215-2000 nm.
7. The system according to claim 1, wherein said Nd: the YAG laser emits pulsed laser light with a wavelength of 1064 nm.
8. The system of claim 1, wherein the first spectrometer is an ocean optics MAX2500+ spectrometer and the second spectrometer is an MS5204i spectrometer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116087105A (en) * | 2022-12-26 | 2023-05-09 | 上海富科思分析仪器有限公司 | Variable optical path flow cell in ultraviolet visible spectrum range and control method thereof |
| CN116735567A (en) * | 2023-08-15 | 2023-09-12 | 光谱时代(北京)科技有限公司 | Laser-induced breakdown spectroscopy element analysis equipment |
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2021
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116087105A (en) * | 2022-12-26 | 2023-05-09 | 上海富科思分析仪器有限公司 | Variable optical path flow cell in ultraviolet visible spectrum range and control method thereof |
| CN116087105B (en) * | 2022-12-26 | 2023-10-24 | 上海富科思分析仪器有限公司 | Variable optical path flow cell in ultraviolet visible spectrum range and control method thereof |
| CN116735567A (en) * | 2023-08-15 | 2023-09-12 | 光谱时代(北京)科技有限公司 | Laser-induced breakdown spectroscopy element analysis equipment |
| CN116735567B (en) * | 2023-08-15 | 2023-10-20 | 光谱时代(北京)科技有限公司 | Laser-induced breakdown spectroscopy element analysis equipment |
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