CN109297800B - Laser ablation purging pool - Google Patents
Laser ablation purging pool Download PDFInfo
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- CN109297800B CN109297800B CN201811307937.8A CN201811307937A CN109297800B CN 109297800 B CN109297800 B CN 109297800B CN 201811307937 A CN201811307937 A CN 201811307937A CN 109297800 B CN109297800 B CN 109297800B
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- 238000010926 purge Methods 0.000 title claims abstract description 64
- 238000000608 laser ablation Methods 0.000 title claims abstract description 48
- 238000005070 sampling Methods 0.000 claims abstract description 68
- 230000005540 biological transmission Effects 0.000 claims abstract description 45
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 210000005056 cell body Anatomy 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000443 aerosol Substances 0.000 claims description 26
- 230000001681 protective effect Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 210000003437 trachea Anatomy 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 claims 1
- 239000000523 sample Substances 0.000 abstract description 125
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000013068 control sample Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 75
- 238000010586 diagram Methods 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 6
- 238000010408 sweeping Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001819 mass spectrum Methods 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a laser ablation purging pool and a using method thereof, wherein the laser ablation purging pool comprises a pool body, a sampling head, a box body, a sample disc, a sample feeding gas circuit and a purging gas circuit, wherein the box body is arranged below the pool body; the sample tray is arranged in the cell body, a plurality of sample trays are uniformly arranged on the same circumference of the sample tray, the sample trays are cylindrical through holes, and a frame body is welded at the bottom of the sample trays; the sample injection gas circuit comprises a sample injection gas pipe and two sample gas valves; the blowing gas circuit comprises a gas source, a blowing gas pipe and an auxiliary gas pipe, wherein the gas source is arranged in the box body, and the blowing gas pipe and the auxiliary gas pipe are connected with the gas source. The design of the multi-channel purging gas circuit combined sampling head and the electric control sample tray is used for improving the transmission efficiency of the object to be detected, automatic batch analysis of the samples is realized, meanwhile, the samples to be detected are ensured to be led into the rear-end analysis equipment at the same spatial position in the purging pool, the difference of the transmission efficiency caused by different spatial positions is eliminated, and the uniformity of parallel sample detection results is ensured.
Description
Technical Field
The invention relates to a laser ablation purging pool.
Background
The purging pool is an effective means for introducing aerosol containing an object to be detected, which is generated by laser ablation sampling, into rear-end analysis equipment, can make up for the defects of poor sample introduction reproducibility and low sensitivity of a capillary tube, and is widely applied to analysis of the object to be detected in constant and trace solid samples.
The conventional laser ablation purging pool is of a cylindrical or cuboid structure, a purging gas inlet and a purging gas outlet horizontally pass through the center of the purging pool, and the purging gas inlet and the purging gas outlet are on the same straight line. After entering the purging pool, most of the gas is rapidly conveyed to the gas outlet through the central narrow area, vortex flows are remarkably formed at two sides of the center of the gas flow channel, and the aerosol transmission efficiency of the laser ablation sample is reduced; meanwhile, the existence of the eddy flow can also obviously prolong the carrier gas flushing balance time of the two analysis gaps, and is not beneficial to rapid analysis. In order to reduce the turbulence effect and shorten the analysis time, the volume of the purging pool body is often smaller, the number of samples which can be placed in the pool body is greatly limited, the purging pool needs to be frequently opened for sample loading during batch analysis, and the automation degree is low.
Except the defect in the design of the purging gas circuit, the conventional purging pool is used for fixing the sample support for placing the sample at different positions in the sample pool, and on the premise that the carrier gas condition is not changed, the transmission efficiency of the same sample is different when the same sample is positioned on the sample support at different positions in the purging pool, so that the analysis sensitivity and the uniformity of a parallel sample detection result are directly influenced.
Disclosure of Invention
One of the objectives of the present invention is to solve the above technical problems, and to provide a laser ablation purging pool, which has a simple structure, a reasonable design, and a high transmission efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a laser ablation sweeps pond, includes cell body, sampling head, still includes:
the tank body is arranged below the pool body;
the sample tray is arranged in the cell body and can automatically transmit by taking the central axis of the sample tray as an axis, a plurality of sample trays are uniformly arranged on the same circumference of the sample tray, the sample trays are cylindrical through holes, and a frame body which is convenient for placing samples and can be ventilated is welded at the bottom of the sample tray;
the sample injection gas path comprises a sample injection gas pipe which penetrates through the tank body, and two sample gas valves which are arranged at the end part of the sample injection gas pipe outside the tank body; the sampling head is longitudinally arranged on a sample injection air pipe in the tank body, and a sample injection port of the sampling head is opposite to a sample support positioned below the sampling head; a laser window is arranged at the position of the top wall of the tank body, which is opposite to the sampling head;
the device comprises a sampling head, a blowing gas circuit, a gas source, a blowing gas pipe, an auxiliary gas pipe and a gas source control circuit, wherein the sampling head is arranged in the tank body; the blowing air pipe is provided with a blowing air valve, and the auxiliary air pipe is provided with an auxiliary air valve.
The device further comprises a transmission system, wherein the transmission system comprises a protective cover arranged in the box body, a stepping motor arranged in the protective cover and a transmission shaft which is connected with the stepping motor and sequentially penetrates through the protective cover, the top wall of the box body and the lower wall of the pool body, and the upper part of the transmission shaft is fixed with the middle part of the sample disc so as to drive the sample disc to automatically transmit; and the transmission shaft and the protective cover are in dynamic sealing through an O-shaped ring.
Concretely speaking, transmission system still includes sensor holding ring and photoelectric sensor, the sensor holding ring sets up on the transmission shaft between protection casing and the box roof and rotates with the transmission shaft is synchronous, be equipped with the response groove with the position one-to-one of sample support on the same circumference of sensor holding ring, photoelectric sensor has two at least and sets up on the protection casing, and photoelectric sensor realizes the accurate location of sample dish through survey response groove.
Specifically, the sampling head comprises an upper flow guide cone, a middle connecting cylinder and a lower flow guide cover which are sequentially connected and have central axes coincident to form a laser channel; establish to big-end-up's round platform shape water conservancy diversion chamber in the water conservancy diversion awl, then establish to big-end-up's round platform shape appearance chamber in the kuppe, form the cross-joint between connecting cylinder and the kind trachea and be connected, and connecting cylinder upper end and water conservancy diversion chamber intercommunication, connecting cylinder lower extreme and kind chamber intercommunication.
Specifically speaking, the lower part of the outer side of the upper flow guide cone is provided with a connecting ring, a fixing piece is arranged below the top wall of the tank body around the laser window, and the lower part of the fixing piece is matched with the connecting ring and is in threaded connection with the connecting ring so as to fix the whole sampling head.
Preferably, the inner diameter of the connecting cylinder is consistent with the minimum inner diameter of the diversion cavity.
As a preferable scheme, the auxiliary air pipe is provided with a guiding-in part, the guiding-in part is in a horn shape with a large top and a small bottom, the maximum diameter of the guiding-in part is larger than the diameter of the sample holder, a central circular blocking piece is arranged on an air outlet of the guiding-in part, the edge of the central circular blocking piece is fixed with the guiding-in part through a plurality of connecting pieces, and an annular gap for the auxiliary air to pass through is formed between the central circular blocking piece and the guiding-.
As a preferred scheme, the frame body is a cross rib.
The invention also aims to provide the using method of the laser ablation purging pool, which can effectively improve the transmission efficiency of the object to be detected, ensure that each sample to be detected is introduced into the rear-end analysis equipment at the same spatial position in the purging pool, eliminate the transmission efficiency difference caused by different spatial positions and ensure the uniformity of the detection result of the parallel sample.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a use method of a laser ablation purging pool comprises the following steps:
s1: a scavenging gas valve is opened, scavenging gas enters the tank body and can enter the sampling head from a flow guide cavity and a sample introduction cavity on the sampling head;
s2: starting a transmission system to enable any sample holder with a sample to rotate to be coaxial with the sampling head and the lead-in part;
s3: opening a sample gas valve at the gas inlet end of a sample gas inlet pipe, generating laser ablation aerosol after external laser acts on a sample through a laser window and a sampling head, and enabling the laser ablation aerosol to enter the sampling head from the lower part of the sampling head under the carrying belt of purge gas flowing through the sampling head;
s4: after the sample enters the sampling head, the laser ablation aerosol is brought into the other end of the sample inlet air pipe by the sample inlet air in the direction perpendicular to the laser ablation aerosol, and the other end of the sample inlet air pipe can be connected with the mass spectrum to finish sample inlet.
Further, in step S1, the purge gas valve is opened simultaneously with the auxiliary gas valve, so that the auxiliary gas is purged upward from the bottom edge of the sample holder to introduce the laser ablation aerosol into the sample inlet, and a cylindrical gas curtain is formed at the edge of the sample holder to prevent the laser ablation aerosol from escaping from the sample holder into the sample pool.
Compared with the prior art, the invention has the following beneficial effects:
the purging pool provided by the invention effectively overcomes the defects in the prior art, the transmission efficiency of the object to be tested is obviously improved by the design of the multi-channel purging gas path combined sampling head and the electric control sample tray, the analysis time is obviously shortened, the automatic batch analysis of the samples is realized, and simultaneously, the introduction of the samples to be tested into the rear-end analysis equipment at the same spatial position in the purging pool is ensured, the transmission efficiency difference caused by different spatial positions is eliminated, and the uniformity of the detection result of the parallel samples is ensured.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic structural diagram of two different angles of the sampling head according to the present invention.
FIG. 4 is a diagram showing the positional relationship of the sampling head, the sample tray, and the introducing member according to the present invention.
FIG. 5 is a schematic view of a sample plate according to the present invention.
FIG. 6 is a schematic view of the transmission system of the present invention.
FIG. 7 is a schematic view of the structure of the lead-in member of the present invention.
Fig. 8 is a cross-sectional view of an introducer of the invention.
FIG. 9 is a schematic view of the purge gas flow path of the present invention.
FIG. 10 is a power diagram of the control system of the present invention.
FIG. 11 is a PLC wiring diagram of the control system of the present invention.
FIG. 12 is a wiring diagram of the stepper motor driver of the control system of the present invention.
Wherein, the names corresponding to the reference numbers are:
1-a cell body, 11-a fixing part, 2-a flow guide cone, 21-a connecting cylinder, 22-a flow guide cover, 23-a flow guide cavity, 24-a sample injection cavity, 25-a connecting ring, 3-a sample plate, 31-a sample holder, 32-a frame body, 4-a sample injection pipe, 41-a sample gas valve, 5-a purge gas pipe, 51-an auxiliary gas pipe, 52-a leading-in part, 54-a purge gas valve, 55-an auxiliary gas valve, 56-a circular baffle, 57-a connecting piece, 6-a protective cover, 61-a stepping motor, 62-a transmission shaft, 63-a sensor positioning ring, 64-a photoelectric sensor, 65-a sensing groove and 7-a box body.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
The embodiment is a laser ablation purging pool designed for solving the problems of low transmission efficiency, large turbulence effect, long analysis time, low automation degree, poor analysis sensitivity, poor uniformity of parallel sample detection results and the like of the purging pool in the prior art, and provides a using method thereof, specifically referring to fig. 1-12, the structure of the laser ablation purging pool comprises a pool body 1, a box body 7, a sample introduction gas circuit, a purging gas circuit, a sampling head, a sample disc 3 and a transmission system, and specifically comprises the following steps:
the pool body 1 can be directly selected from the existing pool body of the sweeping pool, and the positions of openings such as an inlet and an outlet are adjusted to adapt to the device.
And the box body 7 is arranged below the tank body and is used for installing electromechanical equipment, an air source pipeline and the like of the device.
The sample gas path comprises a sample gas pipe 4 penetrating through the tank body and two sample gas valves 41 arranged at the end parts of the sample gas pipe outside the tank body, wherein one sample gas valve enters the sample gas after being started, and the other sample gas valve can be connected with a sample mass spectrometer outside by a flange according to the inlet requirement so as to facilitate sample introduction; the sampling head is longitudinally arranged on a sample injection air pipe in the tank body, and a sample injection port of the sampling head is opposite to a sample support positioned below the sampling head; and a laser window is arranged at the position of the top wall of the tank body, which is opposite to the sampling head, so that laser can be incident conveniently.
The purging gas circuit comprises a gas source, a purging gas pipe 5 and an auxiliary gas pipe 51, wherein the gas source is arranged in the box body 7, and the purging gas pipe and the auxiliary gas pipe are connected with the gas source; the upper end of the purge gas pipe 5 is communicated with the tank body 1, a purge gas valve 54 is arranged on the purge gas pipe, and purge gas can be supplied to the tank body 1 when the purge gas valve is opened; the upper end of the auxiliary air pipe penetrates into the lower portion of a sample plate in the cell body and is right opposite to a sample inlet of the sampling head, an auxiliary air valve 55 is arranged on the auxiliary air pipe, a guide-in piece 52 is arranged on the auxiliary air pipe 51, the guide-in piece is in a horn shape with a large upper portion and a small lower portion, the maximum diameter of the guide-in piece is slightly larger than the diameter of a sample support, the center of the guide-in piece is closed, specifically, a central circular blocking piece 56 is arranged on an air outlet of the guide-in piece, the edge of the central circular blocking piece is fixed with the guide-in piece through a plurality of connecting pieces 57, an annular gap for auxiliary air to pass through is formed between the central circular blocking piece and the guide-in piece, besides the laser ablation aerosol is introduced into the sampling head.
The sampling head adopts a funnel-shaped cavity design and comprises an upper diversion cone 2, a middle connecting cylinder 21 and a lower diversion cover 22 which are sequentially connected from top to bottom; establish to big-end-up's round platform shape water conservancy diversion chamber 23 in the water conservancy diversion awl 2, then establish to big-end-up's round platform shape appearance chamber 24 in the kuppe 22, form the cross-connection between connecting cylinder 21 and the appearance trachea 4, and connecting cylinder upper end and water conservancy diversion chamber intercommunication, connecting cylinder lower extreme and advance a kind chamber intercommunication, formed the laser access of inner chamber axis coincidence promptly to then all be fan-shaped (refer to fig. 8) from top to bottom to the sweeping gas forms like the air current access that the arrow point is shown. Laser penetrates through a laser window on an upper cover of the cell body and then passes through the flow guide cavity, the inner cavity of the connecting cylinder and the sample injection cavity, the laser is hit on a sample placed in the sample holder to generate ablation aerosol, and the blowing gas guides the laser ablation aerosol into the sampling head and then sample gas further guides the aerosol into a pipeline connected with the mass spectrum. Wherein, 2 outside lower parts of upper portion water conservancy diversion awl are equipped with the go-between 25, 1 roof below of cell body is equipped with a mounting 11 around the laser window, this mounting lower part and go-between match and with go-between threaded connection, with fixed whole sampling head, the mounting 11 of this embodiment is the form of class gallows, including lower part and go-between threaded connection's fixed disk, and the many connecting rods of fixed disk and cell body roof are connected to upper portion, of course, this mounting also can be other forms, as long as can be fixed with the go-between and can not obstruct the interior sweeping gas of cell body and get into the water conservancy diversion chamber can. In addition, the inner diameter of the connecting cylinder 21 is consistent with the minimum inner diameter of the diversion cavity 23. Because the sampling head link up from top to bottom, the sweeping gas that gets into through the water conservancy diversion chamber in the sampling head top can prevent to get into the laser ablation aerosol of sampling head and upwards spill the sampling head, and the conical design in sampling head water conservancy diversion chamber and appearance chamber can realize the focus of sweeping gas, prevents that laser ablation aerosol from spilling, and the cooperation sweeps gas circuit, advances the gas circuit and supplementary gas circuit realizes the high-efficient transmission of laser ablation sample.
The sample tray 3 is arranged in the tank body, 12 sample holders 31 are uniformly arranged on the same circumference of the sample tray, each sample holder is a cylindrical through hole, and a cross rib which is convenient for placing a sample and can ventilate is welded at the bottom of each sample holder to serve as a frame body 32; this sample dish can use self axis to pass as the axle under transmission system drives to in proper order hold in the palm the sample and move to under the sampling head in proper order, evenly place 12 samples on the sample dish, sample dish is every rotates 30 degrees promptly, and the laser sampling window corresponds the sample box and pauses the sample.
The transmission system comprises a protective cover 6 arranged in the box body 7, a stepping motor 61 arranged in the protective cover, and a transmission shaft 62 connected with the stepping motor and sequentially penetrating through the protective cover, the top wall of the box body and the lower wall of the tank body, wherein the upper part of the transmission shaft is fixed with the middle part of the sample disc 3 to drive the sample disc to automatically transmit; and the difference lies in, this application realize the transmission shaft movive seal through O type circle between transmission shaft and the protection casing, and transmission system still includes sensor holding ring 63 and photoelectric sensor 64, the sensor holding ring sets up on the transmission shaft between protection casing and the box roof and rotates with the transmission shaft is synchronous, be equipped with on the same circumference of sensor holding ring with the position one-to-one of sample support 31 response groove 65, photoelectric sensor has two at least and sets up on the protection casing, and photoelectric sensor realizes the accurate location of sample dish through survey response groove.
In this embodiment, the transmission system may be directly controlled manually, or may be automatically controlled by setting an electric control unit in advance. Taking automatic control as an example, as shown in a control system power supply diagram of fig. 10, a control system PLC wiring diagram of fig. 11, and a control system stepper motor driver wiring diagram of fig. 12, the present embodiment mainly controls a stepper motor: according to the requirement of an input file, 12 samples are uniformly placed on the sample measuring turntable, namely, each time the sample disk rotates 30 degrees, the laser sampling window stops sampling corresponding to the sample box. The device simultaneously has local inching reset, inching forward rotation and inching reverse rotation; remote inching reset, inching forward rotation, inching reverse rotation and linkage. In the remote linkage, the sample box pauses for testing time which is set by an operator and ranges from 1 s to 99 s; the number of the linkage rotation steps can also be set by an operator, the range is between 1 step and 11 steps, and the maximum is 11 steps. This electrical control unit belongs to a comparatively mature technical unit, and it is very simple and convenient to realize, therefore this embodiment no longer gives detailed description to its specific circuit structure, theory of operation.
In addition, the embodiment also provides a use method of the laser ablation purging pool, which specifically comprises the following steps:
s1: a purge gas valve 54 is opened, purge gas enters the tank body 1 and can enter a sampling head from a flow guide cavity and a sample introduction cavity on the sampling head;
s2: starting a transmission system to enable any sample holder 31 filled with a sample to rotate to be coaxial with the sampling head and the lead-in piece 52;
s3: opening a sample gas valve 41 at the gas inlet end of the sample gas inlet pipe 4, generating laser ablation aerosol after external laser acts on a sample through a laser window and a sampling head, and enabling the laser ablation aerosol to enter the sampling head from the lower part of the sampling head under the carrying belt of purge gas flowing through the sampling head;
s4: after the sample enters the sampling head, the laser ablation aerosol is brought into the other end of the sample inlet air pipe by the sample inlet air in the direction perpendicular to the laser ablation aerosol, and enters a mass spectrometer or other detection equipment to finish sample introduction.
In step S1, the purge valve 54 is opened and the auxiliary gas valve 55 is opened at the same time, so that the auxiliary gas is purged upward from the bottom edge of the sample holder 31 to introduce the laser ablation aerosol into the sample inlet, and a cylindrical gas curtain is formed at the edge of the sample holder to prevent the laser ablation aerosol from escaping from the sample holder into the sample pool.
The design that this embodiment sweeps the pond and has effectively overcome prior art not enough, and its multichannel sweeps the gas circuit and unites sampling head and automatically controlled sample dish is showing and is improving determinand transmission efficiency, is showing and has shortened the analysis time, guarantees each sample that awaits measuring and introduces rear end analytical equipment in sweeping same spatial position in the pond when realizing the automatic batch analysis of sample, has eliminated because the different transmission efficiency differences that cause of spatial position, has guaranteed the homogeneity of parallel appearance testing result.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a laser ablation sweeps pond, includes cell body (1), sampling head, its characterized in that still includes:
the tank body (7) is arranged below the tank body;
the sample tray (3) is arranged in the pool body and can automatically transmit by taking the central axis of the sample tray as an axis, a plurality of sample trays (31) are uniformly arranged on the same circumference of the sample tray, the sample trays are cylindrical through holes, and a frame body (32) which is convenient for placing samples and can be ventilated is welded at the bottom of the sample tray;
the sample injection gas path comprises a sample injection gas pipe (4) which penetrates through the tank body, and two sample gas valves (41) which are arranged at the end parts of the sample injection gas pipe outside the tank body; the sampling head is longitudinally arranged on a sample injection air pipe in the tank body, and a sample injection port of the sampling head is opposite to a sample support positioned below the sampling head; a laser window is arranged at the position of the top wall of the tank body, which is opposite to the sampling head;
the device comprises a blowing gas circuit, a sampling head and a gas source, wherein the blowing gas circuit comprises a gas source arranged in a box body (7), a blowing gas pipe (5) connected with the gas source and an auxiliary gas pipe (51), the upper end of the blowing gas pipe is communicated with a pool body, and the upper end of the auxiliary gas pipe penetrates into the lower part of a sample disc in the pool body and is opposite to a sample inlet of the sampling head; the blowing air pipe is provided with a blowing air valve (54), and the auxiliary air pipe is provided with an auxiliary air valve (55).
2. The laser ablation purging pool according to claim 1, further comprising a transmission system, wherein the transmission system comprises a protective cover (6) arranged in the box body (7), a stepping motor (61) arranged in the protective cover, and a transmission shaft (62) connected with the stepping motor and sequentially penetrating through the protective cover, the top wall of the box body and the lower wall of the pool body, and the upper part of the transmission shaft is fixed with the middle part of the sample disc (3) to drive the sample disc to automatically transmit; and the transmission shaft and the protective cover are in dynamic sealing through an O-shaped ring.
3. The laser ablation purging pool according to claim 2, wherein the transmission system further comprises a sensor positioning ring (63) and photoelectric sensors (64), the sensor positioning ring is arranged on the transmission shaft between the protective cover and the top wall of the box body and rotates synchronously with the transmission shaft, the same circumference of the sensor positioning ring is provided with sensing grooves (65) which correspond to the positions of the sample holders (31) one by one, at least two photoelectric sensors are arranged on the protective cover, and the photoelectric sensors realize accurate positioning of the sample plate by measuring the sensing grooves.
4. The laser ablation purging pool according to claim 2 or 3, wherein the sampling head comprises an upper flow guide cone (2), a middle connecting cylinder (21) and a lower flow guide cover (22) which are connected in sequence and have central axes coincident to form a laser passage; establish to big-end-up's round platform shape water conservancy diversion chamber (23) in water conservancy diversion awl (2), then establish to big-end-up's round platform shape appearance chamber (24) in kuppe (22), form the cross-connection between connecting cylinder (21) and advance kind trachea (4), and connecting cylinder upper end and water conservancy diversion chamber intercommunication, connecting cylinder lower extreme and advance kind chamber intercommunication.
5. A laser ablation purging pool according to claim 4, wherein a connecting ring (25) is arranged at the lower part of the outer side of the upper flow guiding cone (2), a fixing piece (11) is arranged around the laser window below the top wall of the pool body (1), and the lower part of the fixing piece is matched with the connecting ring and is in threaded connection with the connecting ring so as to fix the whole sampling head.
6. A laser ablation purging pool according to claim 5, wherein the connecting cylinder (21) inner diameter is consistent with the smallest inner diameter of the diversion cavity (23).
7. The laser ablation purging pool as claimed in claim 6, wherein the auxiliary gas pipe (51) is provided with a guiding member (52), the guiding member is in a horn shape with a large top and a small bottom, the maximum diameter of the guiding member is larger than the diameter of the sample holder, a central circular baffle (56) is arranged at a gas outlet of the guiding member, the edge of the central circular baffle is fixed with the guiding member through a plurality of connecting pieces (57), and an annular gap for the auxiliary gas to pass through is formed between the central circular baffle and the guiding member.
8. A laser ablation purging pool according to claim 7, wherein the frame body (32) is a cross rib.
9. The method of using a laser ablation purge cell of claim 8, comprising the steps of:
s1: a purge gas valve (54) is opened, purge gas enters the tank body (1) and can enter the sampling head from a flow guide cavity and a sample introduction cavity on the sampling head;
s2: starting a transmission system to enable any sample holder (31) filled with a sample to rotate to be coaxial with the sampling head and the lead-in part (52);
s3: opening a sample air valve (41) at the air inlet end of a sample air pipe (4), generating laser ablation aerosol after external laser acts on a sample through a laser window and a sampling head, and enabling the laser ablation aerosol to enter the sampling head from the lower part of the sampling head under the carrying belt of purge gas flowing through the sampling head;
s4: after the sample enters the sampling head, the laser ablation aerosol is brought to the other end of the sample gas pipe by the sample gas in the direction perpendicular to the laser ablation aerosol, and sample introduction is completed.
10. The method for using the laser ablation purge pool according to claim 9, wherein in step S1, the purge gas valve (54) is opened simultaneously with the auxiliary gas valve (55) to purge the auxiliary gas from the bottom edge of the sample holder (31) upwards to introduce the laser ablation aerosol into the sample inlet and form a cylindrical gas curtain at the edge of the sample holder to prevent the laser ablation aerosol from escaping from the sample holder into the sample pool.
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| CN201811307937.8A CN109297800B (en) | 2018-11-05 | 2018-11-05 | Laser ablation purging pool |
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| CN113267641B (en) * | 2021-06-25 | 2024-12-24 | 珠海丰炎科技有限公司 | A single-specimen pneumatic rotary cyclic launching device |
| CN117054212A (en) * | 2023-08-15 | 2023-11-14 | 上海凯来仪器有限公司 | Miniaturized laser ablation system and sample cell module |
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