CN109580556B - Detection environment air pressure control structure of handheld laser-induced breakdown spectrometer - Google Patents
Detection environment air pressure control structure of handheld laser-induced breakdown spectrometer Download PDFInfo
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- CN109580556B CN109580556B CN201910014855.2A CN201910014855A CN109580556B CN 109580556 B CN109580556 B CN 109580556B CN 201910014855 A CN201910014855 A CN 201910014855A CN 109580556 B CN109580556 B CN 109580556B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0162—Arrangements or apparatus for facilitating the optical investigation using microprocessors for control of a sequence of operations, e.g. test, powering, switching, processing
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a detection environment air pressure control structure of a handheld laser-induced breakdown spectrometer, which comprises a housing of the spectrometer and a collecting hole arranged at the front end of the housing, wherein a first sealing ring encircling the periphery of the collecting hole is arranged on the outer wall of the front end of the housing, a laser lens is arranged in the housing, the first sealing ring, the collecting hole and the laser lens jointly form an air cavity, an air inlet and an air outlet are arranged on the laser lens, the aperture of the air inlet is larger than that of the air outlet, an air cylinder is arranged in the housing, an air outlet of the air cylinder is communicated to the air inlet through a pressure reducing valve and a manual valve, air is supplied to the air cavity, a first pressure sensor is arranged between the pressure reducing valve and the manual valve, and a second pressure sensor is arranged between the manual valve and the air inlet. The first sealing ring is in sealing abutting connection with the tested substance, so that the interior of the air cavity is isolated from the external space, the air cavity is relatively airtight, and the control of the air pressure in the air cavity is realized.
Description
Technical Field
The invention belongs to the technical field of spectrum detection equipment, and particularly relates to a detection environment air pressure control structure of a handheld laser-induced breakdown spectrometer.
Background
The handheld laser-induced breakdown spectrometer comprises a laser excitation part and a spectrum analysis part, and the working principle of the handheld laser-induced breakdown spectrometer is that a small part of materials on the surface of an object to be measured are converted into a plasma state by utilizing laser, then light emitted by the materials in the plasma state is collected by adopting a light collector, and the collected light is further subjected to spectrum analysis by adopting the spectrum analysis part so as to determine the components of the object to be measured.
When the handheld laser-induced breakdown spectrometer detects substances, an inert gas is generally required to be used for protecting a detected area so as to prevent the detected chemical reaction from changing the components of the detected area, and meanwhile, the spectrum analysis accuracy can be improved.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the environment detection air pressure control structure of the handheld laser-induced breakdown spectrometer can control the pressure of the environment detection inert gas.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a handheld laser induction breakdown spectroscopy's detection environment atmospheric pressure control structure, includes the casing of spectrum appearance and sets up the collection hole at the casing front end, is provided with one on the casing front end outer wall and encircles at the peripheral first sealing washer of collection hole, and this first sealing washer outwards stands out in the casing, the inside laser instrument camera lens that is provided with one and gathers the coaxial setting in hole of casing, the front end of this laser instrument camera lens is sealed to dock on the collection hole through the third sealing washer, first sealing washer, collection hole and laser instrument camera lens constitute an air cavity jointly, be provided with an inlet port and an exhaust hole on the laser instrument camera lens, inlet port and exhaust hole homoenergetic intercommunication casing inner space and air cavity, the aperture of inlet port is greater than the aperture of exhaust hole, the inside or outside of casing still is provided with a gas cylinder, is connected with a relief pressure valve on the gas outlet of this gas cylinder, connects first pressure sensor and manual pressure sensor respectively through first three-way connection on the output of manual valve, connects second pressure sensor and inlet port respectively through second three-way connection, and gas cylinder inwards through manual valve and the first pressure sensor, first pressure sensor and second hand-held main control meter display the first pressure sensor that is connected to the first hand-held type laser sensor display the display breakdown signal to the first main control pressure sensor, and the handheld laser induction breakdown sensor display the display pressure sensor.
As a preferred scheme, be connected with a preceding camera lens of covering on gathering the hole between casing front end and the first sealing washer, be provided with a through-hole that sets up coaxial with gathering the hole on the preceding camera lens, offered one on the terminal surface of the front camera lens back to gathering the hole and encircleed at the peripheral annular caulking groove of through-hole, first sealing washer card is established in the caulking groove, and the degree of depth of caulking groove is less than the section diameter of first sealing washer, and outside part first sealing washer exposed the caulking groove, through second sealing washer sealing connection between preceding camera lens and the casing, the second sealing washer also encircleed at the through-hole periphery.
As a preferable scheme, the through hole is a conical hole, and the larger end of the through hole opening is opposite to the collecting hole.
As a preferable scheme, the connecting pipe which extends forwards axially and is matched with the collecting hole is arranged on the front end face of the laser lens, a third sealing ring is sleeved on the connecting pipe, the third sealing ring is tightly abutted on the inner wall of the shell around the collecting hole by the front end face of the laser lens, and the laser lens is fixedly connected inside the shell.
As a preferable scheme, the output air pressure adjusting range of the pressure reducing valve is 0-40 psig.
The beneficial effects of the invention are as follows: the invention utilizes the first sealing ring, the collecting hole and the laser lens to jointly form an air cavity, the air cavity is communicated with the inner space of the shell by utilizing the air exhaust hole, then the air cylinder is adopted to charge air into the air cavity through the air inlet hole, when the air cavity is used, the first sealing ring is in sealing contact with the surface of a detected object to isolate the air cavity from external air, then a small amount of air originally existing in the air cavity is driven into the inner space of the shell from the air exhaust hole by utilizing the air filled in the air cylinder, so that no air exists in the air cavity, the aperture of the air exhaust hole is smaller than the air inlet hole, the air inlet speed is higher than the air exhaust speed, inert gas in the air cavity has certain pressure, finally the air pressure upper limit of the air cavity can be controlled by adjusting the pressure reducing valve, and the air pressure in the air cavity is further adjusted within the upper limit range by the manual valve, thereby realizing the accurate control of the detected environmental air pressure.
The air cavity is isolated from the outside air through the first sealing ring, so that plasma plumes can be prevented from overflowing from the front end of the air cavity to the outside and cannot be collected by the spectrometer, the detection precision can be improved, and meanwhile, the damage of the plasma plumes to human eyes can be reduced.
The invention further connects a front lens covered on the collecting hole between the front end of the shell and the first sealing ring, and the front lens is provided with a through hole, the front lens enlarges the space of the air cavity, prolongs the distance between the detected object and the laser lens, and protects the laser lens from being damaged by the detected object in a plasma state.
The invention further sets the through hole as a conical hole, increases the air cavity space and reduces the temperature of the air cavity.
The invention further provides a connecting pipe which extends forwards axially and is matched with the acquisition hole on the front end face of the laser lens, and the laser lens is positioned by using the connecting pipe, so that the coaxiality of a laser light path and the acquisition hole is ensured.
The invention further sets the output air pressure adjusting range of the pressure reducing valve to be 0-40 psig so as to meet the pressure requirement of the air cavity.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is an enlarged view of a portion a in fig. 1;
FIG. 3 is a perspective view of a laser lens;
fig. 4 is a perspective view of a connection structure of a gas cylinder and a gas inlet hole in the present invention.
In fig. 1 to 4: 1. the device comprises a shell, 2, a collecting hole, 3, a first sealing ring, 4, a laser lens, 5, an air cavity, 6, an air inlet, 7, an air outlet, 8, an air bottle, 9, a pressure reducing valve, 10, a first three-way joint, 11, a first pressure sensor, 12, a manual valve, 13, a second three-way joint, 14, a second pressure sensor, 15, a second sealing ring, 16, a main controller, 17, a display panel, 18, a front lens, 19, a through hole, 20, a caulking groove, 21, a connecting pipe, 22 and a third sealing ring.
Detailed Description
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1-4, the structure for controlling the air pressure of the detection environment of the handheld laser-induced breakdown spectroscopy according to the invention comprises a housing 1 of the spectroscopy and a collection hole 2 arranged at the front end of the housing 1, wherein a front lens 18 covering the collection hole 2 is connected to the outer wall of the front end of the housing 1, a through hole 19 coaxially arranged with the collection hole 2 is arranged on the front lens 18, the through hole 19 is a conical hole, one end of the conical hole with a large opening faces the collection hole 2, an annular caulking groove 20 surrounding the periphery of the through hole 19 is formed in the end face of the front lens 18 opposite to the collection hole 2, a first sealing ring 3 is arranged in the caulking groove 20, the depth of the caulking groove 20 is smaller than the section diameter of the first sealing ring 3, part of the first sealing ring 3 is exposed out of the caulking groove 20, the front lens 18 is in sealing connection with the housing 1 through a second sealing ring 15, and the second sealing ring 15 also surrounds the periphery of the through hole 19.
The inside laser lens 4 that is provided with one and gathers hole 2 coaxial setting of casing 1 is provided with the connecting pipe 21 that extends forward and match with gathering hole 2 axially on the front end terminal surface of this laser lens 4, cup joints third sealing washer 22 on the connecting pipe 21, laser lens 4 front end face tightly supports third sealing washer 22 on gathering hole 2 outlying casing 1 inner wall, laser lens 4 fixed connection is inside casing 1, and specific fixed mode can adopt mechanical bolted connection or bond through the viscose or utilize other parts in the handheld laser induction breakdown spectrometer to carry out butt location connection to and other prior art schemes that can be used for fixed laser lens 4.
The invention discloses a laser spectrum sensor, which is characterized in that a first sealing ring 3, a collecting hole 2 and a laser lens 4 jointly form an air cavity 5, an air inlet 6 and an air outlet 7 are arranged on the laser lens 4, the air inlet 6 and the air outlet 7 can be communicated with the inner space of a shell 1 and the air cavity 5, the inner space of the shell 1 does not comprise the air cavity 5 positioned in the shell 1, the aperture of the air inlet 6 is larger than that of the air outlet 7, an air bottle 8 is arranged in the shell 1, a pressure reducing valve 9 is connected to an air outlet of the air bottle 8, an output end of the pressure reducing valve 9 is respectively connected with a first pressure sensor 11 and a manual valve 12 through a first three-way joint 10, an output end of the manual valve 12 is respectively connected with a second pressure sensor 14 and the air inlet 6 through a second three-way joint 13, the air bottle 8 is respectively and electrically connected to an air cavity 5 through the pressure reducing valve 9 and the manual valve 12, the first pressure sensor 11 and the second pressure sensor 14 are respectively electrically connected to a pressure sensor 16 of a hand-held laser spectrum breakdown-induced spectrometer, the pressure sensor 16 processes detection signals sent by the first pressure sensor 11 and the second pressure sensor 14, and the pressure sensor 14 are displayed on a hand-held laser spectrum-induced pressure sensor 17 after the pressure sensor is processed, and the pressure sensor 14 displays the detected pressure values on a hand-held laser spectrum sensor display panel 17.
The output air pressure of the pressure reducing valve 9 is regulated to be 0-40 psig (Pound per square inch, gauge).
Although the gas cylinder 8 in the present embodiment is fixedly connected to the inside of the housing 1, in actual use, a separate gas cylinder 8 may be used as the gas source, as long as the pressure reducing valve 9 is connected to the gas outlet of the gas cylinder 8.
The working principle of the invention is as follows: as shown in figures 1-4, the invention utilizes the first sealing ring, the collecting hole and the laser lens to jointly form an air cavity, utilizes the air cavity to be communicated with the inner space of the shell, adopts the air bottle to charge air into the air cavity through the air inlet, seals and contacts the surface of the detected object by utilizing the first sealing ring when in use, isolates the air cavity from external air, utilizes the gas filled into the air cavity by utilizing the air bottle to drive a small amount of air originally existing in the air cavity into the inner space of the shell from the air outlet, thereby ensuring that no air exists in the air cavity, simultaneously, sets the aperture of the air outlet smaller than the air inlet, ensures that the air inlet speed is higher than the air outlet speed, ensures that inert gas in the air cavity has certain pressure, finally can control the air pressure upper limit of the air cavity through adjusting the pressure reducing valve, and controls the air pressure in the air cavity to be further adjusted within the upper limit range through the manual valve, thereby realizing accurate control of the detected ambient air pressure.
The air cavity is isolated from the outside air through the first sealing ring, so that plasma plumes can be prevented from overflowing from the front end of the air cavity to the outside and cannot be collected by the spectrometer, the detection precision can be improved, and meanwhile, the damage of the plasma plumes to human eyes can be reduced.
The above embodiments are merely illustrative of the principles and effects of the present invention, and some of the applied embodiments, and are not intended to limit the invention; it should be noted that modifications and improvements can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the present invention.
Claims (5)
1. The utility model provides a handheld laser-induced breakdown spectroscopy's detection environment atmospheric pressure control structure, includes the casing (1) of spectrum appearance and sets up collection hole (2) at casing (1) front end, its characterized in that is provided with one on casing (1) front end outer wall and encircles in collection hole (2) outlying first sealing washer (3), and this first sealing washer (3) outwards protrude in casing (1), casing (1) inside is provided with one and gathers laser lens (4) of hole (2) coaxial setting, and the front end of this laser lens (4) passes through the sealed butt joint of third sealing washer on collection hole (2), first sealing washer (3), collection hole (2) and laser lens (4) constitute an air cavity (5) jointly, be provided with an inlet port (6) and an exhaust hole (7) on laser lens (4), inlet port (6) and exhaust hole (7) all can communicate casing (1) inner space and air bottle (5), and the aperture of gas bottle (6) is greater than the aperture of exhaust hole (7), casing (1) inside or outside are provided with a decompression valve (8) and are connected with one and are provided with one and are connected with (8) this air outlet (9), the output end of the pressure reducing valve (9) is respectively connected with the first pressure sensor (11) and the manual valve (12) through the first three-way joint (10), the output end of the manual valve (12) is respectively connected with the second pressure sensor (14) and the air inlet hole (6) through the second three-way joint (13), the air bottle (8) supplies air to the air cavity (5) through the pressure reducing valve (9) and the manual valve (12), the first pressure sensor (11) and the second pressure sensor (14) are respectively electrically connected to a main controller (16) of the handheld laser-induced breakdown spectrometer, and after the air pressure detection signals sent by the first pressure sensor (11) and the second pressure sensor (14) are processed, the pressure values detected by the first pressure sensor (11) and the second pressure sensor (14) are displayed on a display panel (17) of the handheld laser-induced breakdown spectrometer.
2. The argon atmosphere control structure of the handheld laser-induced breakdown spectrometer according to claim 1, characterized in that a front lens (18) covered on the collecting hole (2) is connected between the front end of the shell (1) and the first sealing ring (3), a through hole (19) coaxially arranged with the collecting hole (2) is formed in the front lens (18), an annular caulking groove (20) encircling the periphery of the through hole (19) is formed in the end face, opposite to the collecting hole (2), of the front lens (18), the first sealing ring (3) is clamped in the caulking groove (20), the depth of the caulking groove (20) is smaller than the section diameter of the first sealing ring (3), part of the first sealing ring (3) is exposed out of the caulking groove (20), the front lens (18) is in sealing connection with the shell (1) through a second sealing ring (15), and the second sealing ring (15) also encircles the periphery of the through hole (19).
3. The argon atmosphere control structure of the handheld laser-induced breakdown spectrometer according to claim 2, wherein the through hole (19) is a conical hole, and the larger end of the through hole (19) is opposite to the collecting hole (2).
4. The argon atmosphere control structure of the handheld laser-induced breakdown spectrometer according to claim 2, wherein a connecting pipe (21) which extends forwards axially and is matched with the collection hole (2) is arranged on the front end face of the laser lens (4), a third sealing ring (22) is sleeved on the connecting pipe (21), the third sealing ring (22) is tightly abutted on the inner wall of the shell (1) at the periphery of the collection hole (2) by the front end face of the laser lens (4), and the laser lens (4) is fixedly connected inside the shell (1).
5. The argon atmosphere control structure of the handheld laser-induced breakdown spectrometer according to claim 1, wherein the output air pressure of the pressure reducing valve (9) is adjusted to be in a range of 0-40 psig.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910014855.2A CN109580556B (en) | 2019-01-08 | 2019-01-08 | Detection environment air pressure control structure of handheld laser-induced breakdown spectrometer |
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| CN201910014855.2A CN109580556B (en) | 2019-01-08 | 2019-01-08 | Detection environment air pressure control structure of handheld laser-induced breakdown spectrometer |
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| CN109580556B true CN109580556B (en) | 2023-07-04 |
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Families Citing this family (2)
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| CN111896526A (en) * | 2020-06-28 | 2020-11-06 | 苏州星帆华镭光电科技有限公司 | Detection environment air pressure control structure of multifunctional laser-induced breakdown spectrometer |
| CN111929291A (en) * | 2020-06-28 | 2020-11-13 | 苏州星帆华镭光电科技有限公司 | Air cavity air pressure adjusting device of multifunctional laser-induced breakdown spectrometer |
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