Continuous sample detection device for laser-induced breakdown spectroscopy

Abstract

The utility model belongs to the technical field of laser-induced breakdown spectroscopy detection, and particularly relates to a continuous sample detection device for laser-induced breakdown spectroscopy. The device comprises a conveying track, two guide rails are arranged on the upper side of the conveying track, the guide rails are matched with sliding blocks, each guide rail is provided with two sliding blocks, an operation box is fixed below the sliding blocks, and the operation box can move on the guide rails along with the sliding blocks. A pulse laser, a focusing lens, a detector, a spectrograph and a constant temperature device are arranged in the operation box, so that a sample to be detected on the conveying crawler belt can be conveniently detected through the pulse laser. According to the utility model, a plurality of samples can be carried at one time, so that the samples moving on the conveying track can be detected continuously, and the detection efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to laser-induced breakdown spectroscopy detection technical field, especially relate to a kind of for laser-induced breakdown spectroscopy continuous sample inspection device. BACKGROUND

[0002] Laser-induced breakdown spectroscopy analysis system uses high peak power pulsed laser to irradiate sample, and light beam is focused to a very small analysis point.In the laser irradiation spot area, the material in sample is ablated and stripped, and particle cloud is formed above sample.Due to the energy of laser is significantly absorbed by the cloud, gradually forming plasma.High-energy plasma makes particles melt, excite and radiate spectrum.The light emitted by atoms, ions and molecules in plasma can be received and recorded by detector, and by analyzing characteristic wavelength and intensity information of spectrum, different element composition and concentration information existing in measured sample can be obtained.

[0003] LIBS spectrometer is generally mainly composed of laser, sample stage, spectrometer and computer, and its basic working process is that laser output by laser light source is focused on sample surface by focusing lens, sample is excited to plasma state, and emitted plasma spectrum is sent into spectrometer by optical fiber, and data collected by spectrometer is transmitted to computer, and data saving, analysis and display are realized by software.

[0004] Currently, when LIBS spectrometer carries out detection work, sample is generally placed on sample stage, laser is directly focused on sample surface to carry out induction breakdown, and then sample spectrum signal is acquired to carry out measurement.But sample stage can only carry one sample at present, so when multiple samples need to be continuously detected, sample after detection is taken out, and sample is placed again, so efficiency is low, and closed cover of sample stage needs to be opened every time sample is placed, so operation is inconvenient.

[0005] Therefore, a laser-induced breakdown spectroscopy detection system is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to solve the problems of efficiency offset and inconvenient operation of prior art.

[0007] To achieve the above object, the utility model provides a kind of for laser-induced breakdown spectroscopy continuous sample inspection device, including conveying caterpillar, conveying caterpillar is sleeved on the roller of left-right symmetry, and the both ends of two rollers are connected with two side plates by fixed shaft, and a plurality of uniformly distributed small holes are opened on side plate;

[0008] The upper side of the conveying caterpillar is fixed with a guide rail, a sliding block is installed on the guide rail, an operation box is installed at the lower end of the sliding block, a light hole is formed in the bottom of the operation box, a focusing lens, a reflector, a pulse laser, a probe, a spectrometer, a detector and a constant temperature device are installed in the operation box;

[0009] The focusing lens is located directly above the light hole, the reflector is located directly above the focusing lens, the angle between the reflector and the horizontal plane is 45°, the pulse laser is located on the right side of the reflector, and the pulse laser generated by the pulse laser is located on the incident light path of the reflector.

[0010] Further, four supporting rods are installed on the bottom plate at the bottom of the conveying caterpillar and are symmetrically distributed on the left and right ends of the bottom plate, the supporting rod is a matched structure of a hollow cylinder and a solid cylinder, the solid cylinder is inside the hollow cylinder, a plurality of openings are formed in the hollow cylinder, a plurality of openings with the same size are formed in the solid cylinder, and the two are fixed and matched through screws and nuts.

[0011] Further, the guide rail is a linear guide rail, the sliding block is a flange type sliding block, the length of the guide rail is 1 m, the length of the sliding block is 15 cm, and the distance between the two guide rails is 30 cm.

[0012] Further, the detector is installed on the spectrometer and is connected with a computer, and the constant temperature device is located at the right side of the top of the operation box.

[0013] Further, the spectrometer channel and the light hole have a spacing of 10 mm, and the spectrometer channel and the probe of the spectrometer have a spacing of not more than 5 mm.

[0014] Beneficial effects:

[0015] The linkage assembly of the laser-induced breakdown spectroscopy analysis system realizes the simultaneous movement of the to-be-detected sample and the laser, the to-be-detected sample moves from right to left on the conveying caterpillar, the operation box is driven to move through the sliding block, the number of times that the laser pulse acts on the to-be-detected sample is increased, the pulse laser and the spectrometer are packaged together, the relative position of the spectrum acquisition lens and the laser acting on the sample is fixed, and therefore the stability of the light path is improved, a plurality of samples are carried at one time, the detection of the moving sample on the conveying caterpillar can be continuously carried out, and the detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a continuous sample detection platform structure for laser-induced breakdown spectroscopy detection of the utility model;

[0017] Fig. 2 It is an internal view of the operation box of the utility model;

[0018] Fig. 3 is a guide rail specific schematic diagram of the utility model;

[0019] Mark: 1-conveying caterpillar, 2-roller, 3-fixed axle, 4-side plate, 5-supporting rod, 6-operation box, 7-pulse laser, 8-reflector, 9-focusing lens, 10-light hole, 11-probe, 12-spectrometer, 13-detector, 14-computer, 15-constant temperature device, 16-guide rail, 17-sliding block. DETAILED DESCRIPTION

[0020] In order to further understand the invention content, characteristics and efficacy of the utility model, the following examples are cited, and the detailed description is as follows in conjunction with the drawings.

[0021] The structure of the utility model is described in detail below in conjunction with the drawings.

[0022] As Figs. 1-3 shown, a kind of continuous detection device for laser-induced breakdown spectroscopy, including conveying caterpillar 1, roller 2, fixed axle 3, side plate 4, supporting rod 5, operation box 6, pulse laser 7, reflector 8, focusing lens 9, light hole 10, probe 11, spectrometer 12, detector 13, computer 14, constant temperature device 15, guide rail 16, sliding block 17.

[0023] Conveying caterpillar 1 is covered on the roller 2 of left-right symmetry, and the roller 2 is cylindrical structure, and the two ends of two rollers 2 are connected with two side plates 4 through fixed axle 3, and two side plates 4 are located at the front and back of conveying caterpillar 1 and symmetrically distributed.The side plate 4 is provided with a plurality of uniformly distributed small holes, which can reduce the weight of the whole conveying caterpillar system, and also help heat dissipation and ventilation, so that the heat or gas generated during sample detection can be effectively discharged.The fixed axle 3 is fixed on the side plate 4 by a hexagon nut.The conveying caterpillar 1 is designed with sand surface, and the roller 2 is driven by an additional motor to drive the conveying caterpillar 1 to rotate in a clockwise direction.

[0024] Four supporting rods 5 are respectively distributed at the two sides of the bottom of conveying caterpillar 1, and are fixed on the bottom plate of conveying caterpillar 1 by screws, and two pairs of symmetrically distributed are at the left and right ends of the bottom plate, and the supporting rod 5 is a cooperating structure of hollow cylinder and solid cylinder, and the solid cylinder is inside the hollow cylinder, and a plurality of openings are arranged on the hollow cylinder, and a plurality of openings with same size are arranged on the solid cylinder, and the two are fixed and matched by screw nut, so as to realize the fine adjustment of the supporting height and stability of the bottom plate of conveying caterpillar, so that the balance and stability of the device are maintained during operation, and vibration or inclination is prevented.

[0025] Two guide rails 16 are fixed at the middle position of the conveying caterpillar 1, and two sliding blocks 17 are installed on each guide rail 16. The lower end of the sliding block 17 is provided with an operation box 6 which needs to be linearly moved. The sliding block 17 is driven by a motor to move in a given direction in a circular reciprocating linear motion. The guide rail 16 has the characteristics of high smoothness and good rigidity, so as to provide stable motion support. The sliding block 17 has a guide surface matched with the guide rail 16, and is internally provided with a ball to reduce the friction and provide smooth motion.

[0026] In the embodiment, the operation box 6 is a cuboid with a volume of 45cm x 50cm x 17cm and is made of engineering plastic. The operation box 6 is fixedly connected with the sliding block 17 through screws and nuts, so that the operation box 6 has one degree of freedom in the direction of the guide rail 16. The connection between the operation box 6 and the sliding block 17 is tight connection, and the operation box 6 cannot freely slide under the action of gravity.

[0027] In the embodiment, the guide rail 16 is a linear guide rail, and the sliding block 17 is a flange type sliding block. The flange type sliding block has a low height and a wide width, and the mounting hole is a through threaded hole. The guide rail 16 and the sliding block 17 are both made of high-strength metal material steel, and the model of the guide rail 16 and the sliding block 17 is HGH20. The length of the guide rail 16 is 1m, the length of the sliding block 17 is 15cm, and the distance between the two guide rails 16 is 30cm.

[0028] The operation box 6 is arranged above the conveying caterpillar 1, and a light hole 10 is formed in the bottom of the operation box 6. The operation box 6 is internally provided with a focusing lens 9, a reflector 8, a pulse laser 7, a probe 11, a spectrometer 12, a detector 13 and a constant temperature device 15.

[0029] The focusing lens 9 is located directly above the light hole 10, the reflector 8 is located directly above the focusing lens 9, the angle between the reflector 8 and the horizontal plane is 45°, the pulse laser 7 is located on the right side of the reflector 8, and the pulse laser generated by the pulse laser 7 is located on the incident light path of the reflector 8.

[0030] The pulse laser 7 vertically emits pulse laser to the sample to be measured on the conveying caterpillar 1 through the light hole 10 to generate plasma. The spectrometer 12 is located on the right side of the light hole 10, and the probe 11 of the spectrometer 12 is inclined towards the arrangement, that is, the probe 11 of the spectrometer 12 has an angle between the optical axis and the pulse laser of the laser emitting part, which is usually set to be between 30° and 60°, so that the probe 11 of the spectrometer 12 can be inclined to receive the plasma emission spectrum relative to the pulse laser, preventing the blur damage of the converging lens caused by the splashing of particles during the measurement of elements.

[0031] The detector 13 is installed on the spectrometer 12, the detector 13 is connected with a computer 14, and the constant temperature device 15 is located at the right side of the top of the operation box 6.

[0032] The laser emission component and the spectrometer 12 are based on the principle of focusing high-energy density laser onto the measured object, generating high-temperature and high-pressure plasma composed of electrons, ions and atoms near the ablation area on the sample surface. The particles in the plasma undergo atomic energy level transition, radiate element characteristic spectrum, and the characteristic spectrum is collected by the probe 11 into the spectrometer 12, and then transmitted to the detector 13 after being processed by the spectrometer 12. The light signal is converted into an electrical signal by the detector 13 and displayed on the computer 14. In this embodiment, the laser emission component and the spectrometer 12 can adopt the existing structure, and the specific structure is the prior art, which will not be described in detail here.

[0033] The constant temperature device 15 ensures the stability of the internal temperature of the spectrometer 12 to provide accurate and reliable experimental results. By maintaining a constant temperature, the influence of temperature changes on the experiment can be reduced, ensuring the accuracy and repeatability of the experimental data. In addition, the constant temperature device 15 can also protect the internal components of the spectrometer 12 from temperature fluctuations, prolong the service life of the equipment, and improve the stability and reliability of the experiment.

[0034] In this embodiment, the light transmission hole 10 is provided at the side bottom of the operation box 6, ensuring that only the emission spectrum in this direction can enter the spectrometer 12. The light spectrum channel has a gap of 10mm between the light transmission hole 10 and the light spectrum channel, and a gap of not more than 5mm between the light spectrum channel and the probe 11 of the spectrometer 12. The gap forms an airflow entering the light spectrum channel from the outside to the inside, wherein the light spectrum channel refers to a special light path between the light transmission hole 10, the probe 11 and the spectrometer 12, used to guide the spectral information emitted by the measured object into the spectrometer. In addition, the airflow can also form a flushing effect in front of the probe 11 of the spectrometer 12, reducing the probability of fine particles adhering to the probe 11. The gap between the light spectrum channel and the probe 11 of the spectrometer 12 is less than 5mm, which can ensure the flushing effect of the airflow on the probe 11 of the spectrometer 12. If the gap is too large, the flushing effect will basically disappear. In this embodiment, the gap is specifically 5mm, and in other embodiments, the gap can also be 4mm or 3mm.

[0035] The analysis process of the elements contained in the rock debris of the utility model is as follows:

[0036] Step 1, sample preparation and loading, placing the rock debris sample mined out at the right end of the conveying belt 1, ensuring that the sample surface is flat, so that the laser can uniformly and accurately irradiate the sample surface;

[0037] Step 2, set the parameters of the laser, including pulse energy, wavelength, pulse width, etc., to ensure that the laser can effectively break through the sample and generate plasma;

[0038] Step 3, start the conveyor belt 1 to move the rock sample steadily at a speed of 10 cm / s, and then start the guide rail 16 to move the slider 17 at a speed of 5 mm / s to drive the operation box 6 to move on the guide rail 16 in a reciprocating manner, so that the laser can continuously scan the surface of the sample;

[0039] Step 4, start the laser and sample detection, start the pulsed laser 7 and the spectrometer 12, the pulsed laser starts to break the sample to be detected, and single-point multi-detection or multi-point multi-detection mode can be used, and the spectrometer 12 continuously collects the spectral information of the sample;

[0040] Step 5, end of detection and sample exit, turn off the pulsed laser 7 and the spectrometer 12, take the sample to be detected from the conveyor belt 1, and put it into the next sample for detection, or turn off the equipment to stop detection.

[0041] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment are within the scope of the technical scheme of the present application.

Claims

1. A continuous sampling device for laser-induced breakdown spectroscopy, characterized in that, The transmission caterpillar is sleeved on the rollers arranged symmetrically left and right, and the two rollers are connected with the side plates through fixed shafts at the front and rear ends; The upper side of the transmission caterpillar is fixed with a guide rail, the guide rail is installed with a sliding block, the lower end of the sliding block is installed with an operation box, the bottom of the operation box is provided with a light hole, and the operation box is installed with a focusing lens, a reflector, a pulse laser, a probe, a spectrometer, a detector and a constant temperature device; The focusing lens is located directly above the light hole, the reflector is located directly above the focusing lens, the angle between the reflector and the horizontal plane is 45°, the pulse laser is located to the right of the reflector, and the pulse laser generated by the pulse laser is located on the incident light path of the reflector; the spectrometer is located to the right of the light hole, and the probe of the spectrometer is inclined towards the arrangement.

2. The continuous sampling device for laser-induced breakdown spectroscopy according to claim 1, characterized in that A plurality of uniformly distributed small holes are formed in the side plates.

3. The continuous sampling device for laser-induced breakdown spectroscopy according to claim 1, characterized in that, Four supporting rods are installed on the bottom plate at the bottom of the transmission caterpillar, and two pairs of the supporting rods are symmetrically distributed at the left and right ends of the bottom plate, and the supporting rods are the combined structure of hollow columns and solid columns.

4. The continuous sampling device for laser-induced breakdown spectroscopy according to claim 1, characterized in that, The guide rail is a linear guide rail, the sliding block is a flange type sliding block, the length of the guide rail is 1m, the length of the sliding block is 15cm, and the distance between the two guide rails is 30cm.

5. The continuous sampling device for laser-induced breakdown spectroscopy according to claim 1, wherein, The detector is installed on the spectrometer, the detector is connected with a computer, and the constant temperature device is located at the right side of the top of the operation box.

6. The continuous sampling device for laser-induced breakdown spectroscopy according to claim 1, wherein, The light hole, the probe and the spectrometer form a spectrum channel, the spectrum channel and the light hole have a spacing of 10mm, and the spectrum channel and the probe of the spectrometer have a spacing of less than or equal to 5mm.

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