CN107727725B - Planetary vehicle cabin inner detection system for micro-area substance fine analysis - Google Patents
Planetary vehicle cabin inner detection system for micro-area substance fine analysis Download PDFInfo
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- CN107727725B CN107727725B CN201710950214.9A CN201710950214A CN107727725B CN 107727725 B CN107727725 B CN 107727725B CN 201710950214 A CN201710950214 A CN 201710950214A CN 107727725 B CN107727725 B CN 107727725B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
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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
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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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
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
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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
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
Abstract
The invention discloses a detection system in a planetary vehicle cabin for finely analyzing substances in a micro-area, which consists of a mass spectrum subsystem, an optical head, an ultraviolet ultrafast pulse LIBS laser, an ultraviolet single longitudinal mode Raman laser, a high-resolution high-sensitivity ultraviolet visible spectrometer, a time sequence controller and a main controller. The invention has the beneficial effects that the multi-technology fusion detection system in the planet cabin for fine analysis of micro-area material distribution is provided, the three-dimensional shape distribution of micro-areas, n-wavelength ultraviolet laser Raman images, m-spectrum ultraviolet laser induced fluorescence hyperspectral images, LIBS element coarse content distribution images and mass spectrum element fine distribution images of all scanning points on the three-dimensional shape distribution can be obtained, and abundant micro-area material information can be provided for planet science research.
Description
Technical Field
The invention relates to a substance detection system, in particular to a substance detection system adopting laser desorption mass spectrometry, laser induced plasma LIBS, confocal scanning laser Raman imaging and confocal scanning laser induced fluorescence imaging, which is suitable for being installed in a planet cabin and used for detecting micro-area substances in a deep space detection planet open environment, and belongs to the field of planet in-situ detection.
Background
For future deep space exploration, higher requirements are put on substance component detection technology and method, and in-situ fine detection capability is a high-point technology aimed by various aerospace countries. The fine detection requires smaller laser focus point, small analyzed substance quantity, richer element and molecular species, more accurate quantification and is carried out under the monitoring of extremely high spatial resolution imaging.
Laser desorption mass spectrometry (LIBS), laser induced plasma spectroscopy (Raman) and ultraviolet laser induced fluorescence are important means for analyzing substance components, wherein LIBS can realize coarse analysis of substance constituent elements, laser desorption mass spectrometry can realize fine analysis of substance constituents, laser Raman can realize analysis of substance molecular constituents, and ultraviolet laser induced fluorescence can be used for imaging and also can be used for analyzing some elements, especially rare earth elements.
How to efficiently realize the fusion of four detection technologies in a deep space micro-region environment is a great challenge, including the fusion of laser desorption mass spectrometry and LIBS, and the problem of efficient transmission of desorption particles in an open environment is solved; the fusion of laser Raman and ultraviolet fluorescence hyperspectral imaging needs to be solved, and the reasonable selection of laser wavelength, and the division and processing of spectrum signals are needed to be solved; the LIBS and the Raman are fused, so that the multiplexing problem of an optical path and a spectrum channel is required to be solved; detecting the fineness problem, and adding the constraint of a confocal pinhole; in addition, the femto-second laser source can detach nano-scale particles, but at the same time, the LIBS signal is relatively weak, so that the sensitivity of the spectrometer needs to be improved, and the like.
Aiming at the challenges and problems faced by the deep space micro-area multi-technology fusion, the invention provides an integrated detection system in a planet car cabin, which can efficiently combine four technical means of laser desorption mass spectrum, laser induced plasma spectrum (LIBS), laser Raman (Raman) and ultraviolet laser induced fluorescence, and can realize the detection of the geometrical morphology, elements and molecular distribution of all scanning points in the same micro-area through the control of time sequence and scanning and the application of various multiplexing means.
Disclosure of Invention
The invention aims to provide a detection system in a planet car cabin for finely analyzing substances in deep space, which can be used for finely distributing and detecting substances in micro areas of detection objects such as rocks, soil, minerals and the like on the surface of a planet below through a downward window in the planet car cabin.
The invention provides a planetary vehicle cabin internal detection system which is used for finely detecting micro-area substance components of planetary detection targets such as soil, rock, minerals and the like on the surface of a planet, is arranged in a planetary cabin and consists of a mass spectrum subsystem, an optical head, an ultraviolet ultrafast pulse LIBS laser, an ultraviolet single longitudinal mode Raman laser, a high-resolution high-sensitivity ultraviolet visible spectrometer, a time sequence controller and a main controller;
the optical head comprises an LIBS optical fiber coupling mirror, an optical fiber coupler, a receiving pinhole, an ultraviolet visible beam expander, a cut-in controller, a pulse laser beam expander, a transmitting optical fiber coupler, a transmitting pinhole, an ultraviolet beam expander, an ultraviolet dichroic mirror, an ultraviolet visible dichroic mirror, an LIBS cut-in reflector, a three-dimensional high-precision scanning platform, an ultraviolet microscope objective and a scanning controller; the optical head is provided with a test window so as to test; the ultraviolet microscope objective is arranged on the three-dimensional high-precision scanning platform and can be driven by the scanning controller to perform three-dimensional fine movement;
the mass spectrum subsystem comprises an auxiliary air supply device, a mass spectrometer, a mass spectrum detector, a separation cone, an ICP assembly, a interception cone, a capillary tube, a sampling cone, a reflux tube, a flowmeter, a transportation air pump, an ICP air pump and a mass spectrum air pump;
the ultraviolet single longitudinal mode Raman laser is used for Raman molecular imaging and fluorescence hyperspectral imaging, stokes wave number frequency shift of most of Raman molecules pumped by shorter ultraviolet wavelength is still in the ultraviolet range, and fluorescence spectrum of laser is mostly in the visible spectrum. Therefore, the ultraviolet Raman laser is selected to excite Raman and fluorescence spectra and simultaneously have a certain degree of separation; the ultraviolet single longitudinal mode Raman laser is an optical fiber output and is coupled into the transmitting optical axis of the optical head through the transmitting optical fiber and the transmitting optical fiber coupler;
there are two modes of operation for an ultraviolet ultrafast pulsed LIBS laser: the low-repetition frequency mode (less than 10 Hz) is used as an LIBS laser source for exciting LIBS signals of the planetary detection targets and performing element composition coarse analysis; a high repetition frequency mode (more than 5 kilohertz) for transporting laser desorption particles to a mass spectrum subsystem for fine analysis of planetary detection target constituent elements;
the particle transporting module consists of a intercepting cone, a sampling cone, an ICP air pump, a capillary tube, a reflux tube, a transporting air pump and a flowmeter, and can transport laser desorption particles to the ICP assembly with high efficiency in a planetary open environment; the interception cone, the sampling cone and the ICP air pump belong to inlet component parts of the ICP component, and mainly complete efficient enrichment of particles in an enrichment area and entering the ICP component before entering the ICP component; an ICP air pump is connected between the interception cone and the sampling cone, and can be pumped into high vacuum by the ICP air pump to form negative pressure so as to facilitate transport of plasma particle flow; the capillary tube, the return tube and the transport air pump utilize the pumping and siphoning effects, so that plasma aerosol generated by laser ablation and desorption of the ultraviolet ultrafast pulse LIBS laser enters the capillary tube under the bearing of the planet atmosphere to form a plasma particle flow in the tube, and is transported with high efficiency; the return pipe is used for separating the planet atmosphere bearing molecules entering the capillary from the plasma particle flow in the pipe, and pumping the planet atmosphere bearing molecules back to the planet atmosphere environment through the transport air pump; the ICP assembly carries out secondary high-temperature plasma ionization on the plasma particle flow conveyed by the particle conveying module and sends the plasma particle flow into a separation cone in the mass spectrometer, and the auxiliary air supply device is used for cooling a high-temperature torch tube in the ICP assembly; the mass spectrum air pump is used for pumping the region between the separation cone and the mass analyzer in the mass spectrometer into high vacuum so as to effectively enter the mass analyzer by utilizing the secondary high-temperature plasma output by the ICP assembly; the mass analyzer separates out different element particles, and the mass analyzer is used for detection analysis by the mass spectrum detector;
the high-resolution high-sensitivity ultraviolet visible spectrometer is characterized in that LIBS is multiplexed with laser Raman fluorescence spectrum detection, the spectrum range is 220-900nm, the whole spectrum range is divided into three channels, the ultraviolet spectrum range is 220-355 nm, the visible spectrum range is 360-580nm, and the near infrared spectrum range is 580-900nm, so that the optical resolution of the whole spectrum range is 0.2nm on average; since the excitation wavelength of the laser Raman and fluorescence is 360nm, the laser Raman and fluorescence multiplex the second channel, namely 360-580nm. Because the LIBS signal excited by the femtosecond laser is weaker and the Raman signal is also weaker, the requirements of high sensitivity are considered in all three channels, and the sensor array selects an enhanced charge coupled device ICCD; LIBS and laser Raman fluorescence spectrum signals are respectively coupled into a high-resolution high-sensitivity ultraviolet visible spectrometer through two input optical fibers of two-in-one optical fibers to acquire spectrum signals;
the three control ports of the time sequence controller are respectively connected with an ultraviolet single longitudinal mode Raman laser, an ultraviolet ultrafast pulse LIBS laser and an external trigger port of a high-resolution high-sensitivity ultraviolet visible spectrometer, and are used for setting the working frequency of the ultraviolet ultrafast pulse LIBS laser and the time delay of opening between the ultraviolet ultrafast pulse LIBS laser and the high-resolution high-sensitivity ultraviolet visible spectrometer; setting synchronization of the ultraviolet single longitudinal mode Raman laser and the high-resolution high-sensitivity ultraviolet visible spectrometer, namely starting the high-resolution high-sensitivity ultraviolet visible spectrometer to collect at the moment of starting the ultraviolet single longitudinal mode Raman laser;
the main controller can send control instructions to the access controller, the time sequence controller and the scanning controller; for receiving flow value information of a flow meter; controlling the air extraction speed of the transport air pump, the ICP air pump and the mass spectrum air pump; setting the exposure time of the high-resolution high-sensitivity ultraviolet visible spectrometer and receiving the spectrum data output by the high-resolution high-sensitivity ultraviolet visible spectrometer; starting and receiving mass spectrum data output by a mass spectrum detector;
the LIBS receiving optical axis, the transmitting optical axis, the main optical axis and the LIBS transmitting optical axis are coplanar, the main optical axis is parallel to the LIBS transmitting optical axis and is perpendicular to the LIBS receiving optical axis and the transmitting optical axis;
the micro-area substance fine analysis method of the detection system in the planetary vehicle cabin provided by the invention comprises the following steps:
(1) Micro-zone confocal scanning laser Raman/fluorescence imaging
The main controller sends out an instruction to start the time sequence controller; sending an instruction to a cut-in controller to drive the LIBS to cut in the reflector to cut out a main optical axis; the main controller sends out an instruction to set the exposure time of the high-resolution high-sensitivity ultraviolet visible spectrometer; the time sequence controller sends out control pulse to trigger the ultraviolet single longitudinal mode Raman laser and the high-resolution high-sensitivity ultraviolet visible spectrometer to start working;
the ultraviolet single longitudinal mode Raman laser focuses a continuous narrow linewidth ultraviolet laser beam emitted by an emitting optical fiber to an emitting pinhole through an emitting optical fiber coupler, laser passing through the emitting pinhole travels along an emitting optical axis after being expanded by an ultraviolet beam expander, travels upwards along a main optical axis after being reflected by an ultraviolet visible polychromatic mirror through an ultraviolet dichroic mirror, and is focused to a planet detection target focusing point by an ultraviolet microobjective; the Raman scattering and fluorescence emission signals in the backward echo pass through an ultraviolet microscope objective lens, an ultraviolet visible polychromatic lens and an ultraviolet visible beam expander lens and then focus on a receiving pinhole; the Raman and fluorescence signals passing through the receiving pinhole are focused into a two-in-one optical fiber through an optical fiber coupler, and are transmitted into a high-resolution high-sensitivity ultraviolet visible spectrometer through the two-in-one optical fiber to be subjected to light splitting and photoelectric conversion to be converted into fluorescence spectrum signals containing Raman, the signals are transmitted to a main controller, and analysis software in the main controller calculates and updates the integral intensity G of the whole spectrum curve in real time; the main controller sends out an instruction to the scanning controller to drive the ultraviolet microscope objective arranged on the three-dimensional high-precision scanning platform to finely move up and down in the Z direction until G reaches the maximum value, and the scanning controller is in a tight focusing state at the moment; the receiving pinhole and the transmitting pinhole are in confocal symmetrical relation with respect to the ultraviolet-visible multi-color mirror, and the optical constraint can ensure that only echo signals of the laser focusing point can pass through the receiving pinhole to be received and analyzed;
the main controller determines the number of scanning points A, B in the XY direction of the micro-area analysis and the scanning step C, D; the main controller sends an instruction to the scanning controller to drive an ultraviolet microscope lens arranged on a three-dimensional high-precision scanning platform to perform S-shaped scanning on an XY plane (namely, after scanning a step length C to A points along an X axis, a step length D is moved forward along the X axis, A points are scanned backward along the X axis, the number of common scanning points is A multiplied by B, namely A is multiplied by B), and each point on the XY plane moves up and down along a Z axis, so that a single-point tight focusing state is realized according to the fact that G reaches the maximum value;
for each scanning point i, in a tight focusing state, the main controller records the three-dimensional displacement of the three-dimensional high-precision scanning platform and determines the three-dimensional coordinates (x i ,y i ,z i ) The method comprises the steps of carrying out a first treatment on the surface of the Analysis software in the main controller separates Raman discrete spectral line signals from continuous fluorescence spectrum, and extracts n discrete Raman spectral lines lambda 1 ，λ 2 ，...，λ n Record its spectral line intensity I i1 ,I i2 ,...,I in The method comprises the steps of carrying out a first treatment on the surface of the Then dividing the continuous fluorescence spectrum line into m sections with equal spectral intervals; and recording the average intensity J of the fluorescence spectrum of each segment i1 ,J i2 ,J i3 ,...,J im The method comprises the steps of carrying out a first treatment on the surface of the (note: i ranges from 1 to equalIn A X B)
After micro-region scanning of A multiplied by B scanning points is completed, the main controller firstly synthesizes three-dimensional coordinates of the A multiplied by B scanning points and draws the three-dimensional geometric morphology of the micro-region on the surface of the planetary detection target; then, the I of each scanning point is integrated 11 ,I 21 ,...,I i1 ,. the wavelength of the surface micro-area of the planetary detection target is lambda 1 Similarly, the I of each scanning point is integrated 12 ,I 22 ,...,I i2 ,. the wavelength of the surface micro-area of the planetary detection target is lambda 2 Until a wavelength lambda of the planetary detection target surface micro-region is obtained n Raman image of (a); finally, integrating J of each scanning point 11 ,J 21 ,...,J i1 ,. obtaining a fluorescence image of a first spectral band of a microdomain of the surface of the planetary probe target, and similarly integrating the J's of the individual scan points 12 ,J 22 ,...,J i2 ,. obtaining a fluorescence image of a second spectral band of the planetary detection target surface micro-region, until a fluorescence image of an m-th spectral band of the planetary detection target surface micro-region is obtained;
(2) Micro-domain LIBS crude analysis
The main controller sends an instruction to the cut-in controller to drive the LIBS to cut into the main optical axis of the reflector; the main controller sends out instructions to set the exposure time of the high-resolution high-sensitivity ultraviolet visible spectrometer; the main controller sends out instructions to the time sequence controller, and sets the working frequency of the ultraviolet ultrafast pulse LIBS laser and the time delay for starting between the ultraviolet ultrafast pulse LIBS laser and the high-resolution high-sensitivity ultraviolet visible spectrometer;
the main controller sends out an instruction to the scanning controller to drive the ultraviolet microscope objective arranged on the three-dimensional high-precision scanning platform to perform opposite scanning with the step (1) according to the recorded three-dimensional coordinates of A multiplied by B scanning points, namely reverse S-shaped scanning, and reversely finishing the scanning points A multiplied by B of the same micro-area;
performing LIBS detection on each scanning point with a single point of time and second, wherein at the moment, a femtosecond-level ultraviolet pulse laser emitted by an ultraviolet ultrafast pulse LIBS laser along an LIBS emission optical axis is expanded by a pulse laser beam expander, reflected by an ultraviolet bicolor mirror and then transmitted along the emission optical axis, reflected by an ultraviolet visible polychromatic mirror and then travels along a main optical axis, and focused to a planetary detection target focusing point by an ultraviolet microscope objective; the instantaneous excited high-temperature plasma radiation returns through an ultraviolet microscope objective lens, passes through an ultraviolet visible multi-color mirror, is totally reflected by an LIBS cut-in reflecting mirror, is focused by an LIBS optical fiber coupling mirror and enters into a two-in-one optical fiber, and is transmitted into a high-resolution high-sensitivity ultraviolet visible spectrometer through the two-in-one optical fiber to carry out spectrum acquisition; the main controller receives the LIBS spectrum information output by the high-resolution high-sensitivity ultraviolet visible spectrometer, and qualitatively and quantitatively analyzes the element composition and content of the point according to the spectral line position and the intensity relation until the micro-area LIBS analysis of the whole A multiplied by B point is completed;
(3) Micro-area laser desorption mass spectrometry fine analysis
The main controller sends out an instruction to the time sequence controller, sets the working frequency of the ultraviolet ultrafast pulse LIBS laser and starts; the main controller sends out an instruction to the scanning controller to drive the ultraviolet microscope objective arranged on the three-dimensional high-precision scanning platform to perform S-shaped scanning the same as that of the step (1) according to the recorded three-dimensional coordinates of the A multiplied by B scanning points, so as to finish the number A multiplied by B of the scanning points of the same micro-area;
for each scanning point, high-repetition-frequency femtosecond-level ultraviolet pulse laser emitted by an ultraviolet ultrafast pulse LIBS laser along an LIBS emission optical axis is expanded by a pulse laser beam expander, reflected by an ultraviolet bicolor mirror and then transmitted along the emission optical axis, reflected by an ultraviolet visible polychromatic mirror and then travels along a main optical axis, and focused to a planet detection target focusing point by an ultraviolet microscope objective; the high temperature and high pressure formed on the surface of the focusing point ablates and unattached on the focusing point to excite continuous plasma particle aerosol; the main controller starts the transport air pump, the ICP air pump and the mass spectrum air pump according to the set initial air pumping speed; when the three air pumps are started, plasma aerosol generated by laser ablation and desorption of the ultraviolet ultrafast pulse LIBS laser enters the capillary under the driving of planetary atmosphere in an open environment to form an in-tube plasma particle stream, the in-tube plasma particle stream flows to the ICP assembly along the capillary, the flow speed of the in-tube plasma particle stream is related to the air extraction speed of the transport air pump, the air extraction speed is monitored by the flowmeter, the reading of the real-time flowmeter is transmitted to the main controller, and the main controller changes the air extraction speed of the transport air pump according to the reading so as to form stable plasma particle stream. The plasma particle flow flows into the return pipe under the bearing of the planetary atmosphere, reaches the cone tip position of the sampling cone, and the planetary atmosphere is extracted through the return pipe and returns to the planetary open atmosphere environment; the plasma particle flow forms an enrichment area at the cone tip position of the sampling cone, enters the sampling cone, passes through a cone hole of the sampling cone, passes through the interception cone and enters the ICP assembly; the ICP component carries out secondary high-temperature plasma ionization on the plasma particle flow, sends the plasma particle flow into a separation cone, and then enters a mass analyzer of the mass spectrometer, the mass analyzer separates out different element particles, and the mass analyzer is detected and counted by a mass spectrum detector; the main controller acquires a count value for analysis to obtain the composition and the accurate content of the elements at the scanning point; until the micro-area mass spectrum analysis of the whole A multiplied by B point is completed;
(4) Micro-region substance analysis light mass spectrum information fusion
And (3) the main controller fuses the information in the steps (1) to (3) to finish fine analysis of the micro-region substances, namely, three-dimensional morphology distribution of the micro-region is obtained altogether, and n-wavelength ultraviolet laser Raman images of A multiplied by B scanning points, m-spectrum ultraviolet laser induced fluorescence hyperspectral images, LIBS element coarse content distribution images and mass spectrum element fine distribution images on the three-dimensional morphology distribution are obtained.
The invention has the beneficial effects that the multi-technology fusion detection system in the planet cabin for fine analysis of micro-area material distribution is provided, the three-dimensional shape distribution of micro-areas, n-wavelength ultraviolet laser Raman images, m-spectrum ultraviolet laser induced fluorescence hyperspectral images, LIBS element coarse content distribution images and mass spectrum element fine distribution images of all scanning points on the three-dimensional shape distribution can be obtained, and abundant micro-area material information can be provided for planet science research.
Drawings
FIG. 1 is a schematic diagram of a system structure according to the present invention, wherein: 1-a planetary compartment; 2—a mass spectrometry subsystem; 3-an auxiliary air supply; 4-mass spectrometer; 5-mass spectrometer detector; 6, separating cone; 7-ICP assembly; 8, cutting a cone; 9—libs fiber optic coupling mirror; 10—libs receive optical axis; 11-an optical fiber coupler; 12-receiving pinholes; 13-ultraviolet visible beam expander; 14-ultraviolet ultrafast pulsed LIBS laser; 15-a master controller; 16-ultraviolet single longitudinal mode raman laser; 17—a timing controller; 18-cut-in controller; 19—pulsed laser beam expander; 20—an emission fiber; 21-two-in-one fiber; 22-high resolution high sensitivity uv-vis spectrometer; 23—a launch fiber coupler; 24—an emission pinhole; 25-ultraviolet beam expander; 26—an emission axis; 27—an optical head; 28-ultraviolet dichroic mirror; 29—a main optical axis; 30—an ultraviolet visible polychromatic mirror; 31—libs cut into the mirror; 32—a three-dimensional high precision scanning platform; 33—planetary probe target; 34—focus point; 35—a test window; 36-ultraviolet microscope objective; 37-a plasma particle stream; 38-capillary; 39—a scan controller; 40—sampling cone; 41-a return pipe; 42-an enrichment zone; 43—a flow meter; 44—a transport air pump; 45-ICP air pump; 46—mass spectrometry air pump; 47—libs transmit optical axis.
Note that: LIBS, laser-induced spectroscopy, laser-induced breakdown spectroscopy; ICP, inductively coupled plasma, inductively coupled plasma.
Detailed Description
An embodiment of the present invention is shown in fig. 1.
The invention provides a planetary vehicle cabin internal detection system which is used for finely detecting micro-area substance components of a planetary detection target 33 such as soil, rock, minerals and the like on the surface of a planet, is arranged in a planetary cabin 1 and consists of a mass spectrum subsystem 2, an optical head 27, an ultraviolet ultrafast pulse LIBS laser 14, an ultraviolet single longitudinal mode Raman laser 16, a high-resolution high-sensitivity ultraviolet visible spectrometer 22, a time sequence controller 17 and a main controller 15;
the optical head 27 comprises a LIBS optical fiber coupling mirror 9, an optical fiber coupler 11, a receiving pinhole 12, an ultraviolet visible beam expander 13, a cut-in controller 18, a pulse laser beam expander 19, an emitting optical fiber coupler 23, an emitting pinhole 24, an ultraviolet beam expander 25, an ultraviolet dichroic mirror 28, an ultraviolet visible polychromatic mirror 30, an LIBS cut-in reflector 31, a three-dimensional high-precision scanning platform 32, an ultraviolet microscope objective 36 and a scanning controller 39; the optical head 27 is provided with a test window 35 for testing; the ultraviolet microscope objective 36 is arranged on the three-dimensional high-precision scanning platform 32 and can be driven by the scanning controller 39 to perform three-dimensional fine movement;
the mass spectrum subsystem 2 comprises an auxiliary gas supply device 3, a mass spectrometer 4, a mass spectrum detector 5, a separation cone 6, an ICP assembly 7, a interception cone 8, a capillary tube 38, a sampling cone 40, a return pipe 41, a flowmeter 43, a transport gas pump 44, an ICP gas pump 45 and a mass spectrum gas pump 46;
an ultraviolet single longitudinal mode raman laser 16 (this embodiment employs a continuous semiconductor pumped solid state laser with a wavelength of 360nm, single longitudinal mode, narrow linewidth, and power of 30 mW) is used for molecular imaging and fluorescence hyperspectral imaging of raman, the stokes number shift of most of the raman molecules pumped at the shorter ultraviolet wavelength still lies in the ultraviolet range, while the fluorescence spectrum of the laser is mostly in the visible range. Therefore, the ultraviolet Raman laser is selected to excite Raman and fluorescence spectra and simultaneously have a certain degree of separation; the ultraviolet single longitudinal mode Raman laser 16 is an optical fiber output and is coupled into an emission optical axis 26 of the optical head 27 through the emission optical fiber 20 and the emission optical fiber coupler 23;
the ultra-violet ultra-fast pulsed LIBS laser 14 (this embodiment employs a femtosecond laser with a wavelength of 355nm, an adjustable repetition frequency of 1-1MHz, a pulse width of less than 400fs, a pulse energy of 40 μj, an average power of 4W, and a peak power of 100 MW) has two modes of operation: a low repetition frequency mode (less than 10 Hz) is used as a LIBS laser source for exciting a LIBS signal of the planetary probe target 33 to perform a rough analysis of the elemental composition; a high repetition frequency mode (more than 5 kilohertz) for transporting laser desorption particles to the mass spectrum subsystem 2 for fine analysis of constituent elements of the planetary detection target 33;
the intercepting cone 8, the sampling cone 40, the ICP air pump 45, the capillary 38, the return pipe 41, the transport air pump 44 and the flowmeter 43 form a particle transport module, which can transport laser desorption particles to the ICP assembly 7 in a planetary open environment with high efficiency; the interception cone 8, the sampling cone 40 and the ICP air pump 45 belong to inlet components of the ICP assembly 7, and mainly complete efficient enrichment of particles in the enrichment area 42 and entering the ICP assembly 7 before entering the ICP assembly 7; an ICP air pump 45 is connected between the interception cone 8 and the sampling cone 40, and can be pumped into high vacuum by the ICP air pump 45 to form negative pressure so as to facilitate the transportation of the plasma particle stream 37; the capillary tube 38, the return tube 41 and the transport air pump 44 can realize that plasma aerosol generated by laser ablation and desorption of the ultraviolet ultrafast pulse LIBS laser 14 enters the capillary tube 38 under the bearing of the planet atmosphere to form an in-tube plasma particle stream 37 for efficient transport by utilizing the pumping and siphoning effects; the return conduit 41 functions to separate the planet atmospheric carrier molecules entering the capillary 38 from the in-conduit plasma particle stream 37 and is drawn out by the transport air pump 44 back into the planet atmospheric environment; the ICP assembly 7 carries out secondary high-temperature plasma ionization on the plasma particle stream 37 conveyed by the particle conveying module and sends the plasma particle stream to the separation cone 6 in the mass spectrometer 4, and the auxiliary air supply device 3 is used for cooling a high-temperature tube in the ICP assembly 7; the mass spectrum air pump 46 is used for pumping the region between the separation cone 6 and the mass analyzer in the mass spectrometer 4 into high vacuum so as to effectively enter the mass analyzer by utilizing the secondary high-temperature plasma output by the ICP assembly 7; the mass analyzer separates out different element particles, and the different element particles are detected and analyzed by the mass spectrum detector 5;
the high-resolution high-sensitivity ultraviolet visible spectrometer 22 is the multiplexing of LIBS and laser Raman fluorescence spectrum detection, the spectrum range is 220-900nm, the whole spectrum range is divided into three channels, the ultraviolet spectrum range is 220-355 nm, the visible spectrum range is 360-580nm, and the near infrared spectrum range is 580-900nm, so that the optical resolution of the whole spectrum range is 0.2nm on average; since the excitation wavelength of the laser Raman and fluorescence is 360nm, the laser Raman and fluorescence multiplex the second channel, namely 360-580nm. Because the LIBS signal excited by the femtosecond laser is weaker and the Raman signal is also weaker, the requirements of high sensitivity are considered in all three channels, and the sensor array selects an enhanced charge coupled device ICCD; LIBS and laser Raman fluorescence spectrum signals are respectively coupled into a high-resolution high-sensitivity ultraviolet visible spectrometer 22 through two input optical fibers of a two-in-one optical fiber 21 to acquire spectrum signals;
the three control ports of the time schedule controller 17 are respectively connected with the ultraviolet single longitudinal mode Raman laser 16, the ultraviolet ultrafast pulse LIBS laser 14 and the external trigger port of the high-resolution high-sensitivity ultraviolet visible spectrometer 22, and are used for setting the working frequency of the ultraviolet ultrafast pulse LIBS laser 14 and the opening time delay between the ultraviolet ultrafast pulse LIBS laser 14 and the high-resolution high-sensitivity ultraviolet visible spectrometer 22; the synchronization of the ultraviolet single longitudinal mode Raman laser 16 and the high-resolution high-sensitivity ultraviolet visible spectrometer 22 is set, namely the high-resolution high-sensitivity ultraviolet visible spectrometer 22 is started to collect at the moment of starting the ultraviolet single longitudinal mode Raman laser 16;
the main controller 15 may send control instructions to the access controller 18, the timing controller 17, and the scan controller 39; for receiving flow value information of the flow meter 43; controlling the pumping speeds of the transport air pump 44, the ICP air pump 45 and the mass spectrum air pump 46; setting the exposure time of the high-resolution high-sensitivity ultraviolet visible spectrometer 22 and receiving the spectrum data output by the high-resolution high-sensitivity ultraviolet visible spectrometer 22; starting and receiving mass spectrum data output by a mass spectrum detector 5;
the LIBS receiving optical axis 10, the transmitting optical axis 26, the main optical axis 29 and the LIBS transmitting optical axis 47 are coplanar, the main optical axis 29 is parallel to the LIBS transmitting optical axis 47 and is perpendicular to the LIBS receiving optical axis 10 and the transmitting optical axis 26;
the micro-area substance fine analysis method of the detection system in the planetary vehicle cabin provided by the invention comprises the following steps:
(1) Micro-zone confocal scanning laser Raman/fluorescence imaging
The main controller 15 gives an instruction to start the time sequence controller 17; issuing a command to the cut-in controller 18 to drive the LIBS to cut into the mirror 31 and cut out the primary optical axis 29; the main controller 15 issues an instruction to set the exposure time of the high-resolution high-sensitivity ultraviolet visible spectrometer 22; the time schedule controller 17 sends out control pulse to trigger the ultraviolet single longitudinal mode Raman laser 16 and the high-resolution high-sensitivity ultraviolet visible spectrometer 22 to start working;
the ultraviolet single longitudinal mode Raman laser 16 focuses a continuous narrow linewidth ultraviolet laser beam emitted by the emitting optical fiber 20 to the emitting pinhole 24 through the emitting optical fiber coupler 23, and the laser beam passing through the emitting pinhole 24 travels along the emitting optical axis 26 after being expanded by the ultraviolet beam expander 25, travels upwards along the main optical axis 29 after being reflected by the ultraviolet visible polychromatic mirror 30 through the ultraviolet dichroic mirror 28, and is focused to the focusing point 34 of the planetary detection target 33 by the ultraviolet microobjective 36; the Raman scattering and fluorescence emission signals in the backward echo pass through the ultraviolet microscope objective 36, the ultraviolet visible polychromatic mirror 30 and the ultraviolet visible beam expander 13 and then are focused on the receiving pinhole 12; the Raman and fluorescence signals passing through the receiving pinhole 12 are focused into a two-in-one optical fiber 21 through an optical fiber coupler 11, are transmitted into a high-resolution high-sensitivity ultraviolet visible spectrometer 22 through the two-in-one optical fiber 21 to be subjected to light splitting and photoelectric conversion to be converted into fluorescence spectrum signals containing Raman, the signals are transmitted to a main controller 15, and analysis software in the main controller 15 calculates and updates the integral intensity G of the whole spectrum curve in real time; the main controller 15 sends a command to the scanning controller 39 to drive the ultraviolet microscope objective 36 arranged on the three-dimensional high-precision scanning platform 32 to finely move up and down in Z until G reaches the maximum value, and the state is in a tight focusing state at the moment; the receiving pinhole 12 and the transmitting pinhole 24 are in confocal symmetry with respect to the uv-visible polychromatic mirror 30, and the optical constraint ensures that only the echo signal of the laser focal point 34 can be received and analyzed through the receiving pinhole 12;
the main controller 15 determines the number of scanning points A, B in the XY direction of the micro-area analysis, and the scanning step C, D; the main controller 15 sends an instruction to the scanning controller 39 to drive the ultraviolet microscope objective 36 mounted on the three-dimensional high-precision scanning platform 32 to perform S-shaped scanning on an XY plane (namely, after scanning to A points along an X axis according to a scanning step C, the Y axis is positively moved by a step D, then the X axis is reversely scanned by A points, then the Y axis is positively moved by a step D, then the X axis is reversely scanned by A points, the total scanning point is A multiplied by B, namely A is multiplied by B, and each point on the XY plane is vertically moved along a Z axis, so that a single-point tight focusing state is realized according to the fact that G reaches the maximum value;
for each scanning point i, in a tight focusing state, the main controller 15 records the three-dimensional displacement amount of the three-dimensional high-precision scanning platform 32, determines the three-dimensional coordinates (x i ,y i ,z i ) The method comprises the steps of carrying out a first treatment on the surface of the Analysis software within the main controller 15 willThe raman discrete spectral line signal is separated from the continuous fluorescence spectrum, and n (n=3 in this embodiment) discrete raman spectral lines lambda are extracted 1 ，λ 2 ，...，λ n Record its spectral line intensity I i1 ,I i2 ,...,I in The method comprises the steps of carrying out a first treatment on the surface of the The continuous fluorescence line is then divided into m segments of equal spectral interval (this example m=200); and recording the average intensity J of the fluorescence spectrum of each segment i1 ,J i2 ,J i3 ,...,J im The method comprises the steps of carrying out a first treatment on the surface of the (note: i is from 1 up to equal to A X B)
After micro-area scanning of the A×B scanning points is completed, the main controller 15 firstly synthesizes three-dimensional coordinates of the A×B scanning points and draws the three-dimensional geometric morphology of the micro-area on the surface of the planetary detection target 33; then, the I of each scanning point is integrated 11 ,I 21 ,...,I i1 ,. it is obtained that the wavelength of the surface micro-region of the planetary probe target 33 is lambda 1 Similarly, the I of each scanning point is integrated 12 ,I 22 ,...,I i2 ,. it is obtained that the wavelength of the surface micro-region of the planetary probe target 33 is lambda 2 Until a wavelength lambda of the surface micro-region of the planetary probe target 33 is obtained n Raman image of (a); finally, integrating J of each scanning point 11 ,J 21 ,...,J i1 ,. obtaining a fluorescence image of a first spectral band of the microdomains of the surface of the planetary probe target 33, similarly integrating the J's of the individual scan points 12 ,J 22 ,...,J i2 ,., obtaining a fluorescence image of a second spectral band of the surface micro-region of the planetary detection target 33, until a fluorescence image of an m-th spectral band of the surface micro-region of the planetary detection target 33 is obtained;
(2) Micro-domain LIBS crude analysis
The main controller 15 sends an instruction to the cut-in controller 18 to drive the LIBS cut-in mirror 31 to cut into the main optical axis 29; the main controller 15 issues an instruction to set the exposure time (1 ms in this embodiment) of the high-resolution high-sensitivity uv-vis spectrometer 22; the main controller 15 sends instructions to the timing controller 17 to set the operating frequency of the ultra-fast pulse LIBS laser 14 (3 hz in this embodiment) and the delay time between the start of the ultra-fast pulse LIBS laser 14 and the high-resolution high-sensitivity uv-vis spectrometer 22 (10 μs in this embodiment);
the main controller 15 sends out an instruction to the scanning controller 39 to drive the ultraviolet microscope objective 36 arranged on the three-dimensional high-precision scanning platform 32 to perform the scanning opposite to the step (1) according to the recorded three-dimensional coordinates of the A×B scanning points, namely, reversely scanning in an S shape, and reversely completing the scanning points A×B of the same micro-area;
for each scanning point, LIBS detection is carried out for 1 second at a single point, at this time, femtosecond ultraviolet pulse laser emitted by the ultraviolet ultrafast pulse LIBS laser 14 along the LIBS emission optical axis 47 is expanded by the pulse laser beam expander 19, reflected by the ultraviolet dichroic mirror 28 (355 nm high reflection, 360nm high lens in this embodiment) and then transmitted along the emission optical axis 26, reflected by the ultraviolet visible polychromatic mirror 30 (355-360 nm high reflection, 220-350 and 364nm high lens in this embodiment) and then travels along the main optical axis 29, and is focused by the ultraviolet microobjective 36 to the focusing point 34 of the planetary detection target 33; the high temperature plasma radiation excited instantaneously returns through the ultraviolet microscope objective 36, passes through the ultraviolet visible polychromatic mirror 30, is totally reflected by the LIBS cut-in reflecting mirror 31, is focused by the LIBS optical fiber coupling mirror 9 and enters the two-in-one optical fiber 21, and is transmitted into the high resolution high sensitivity ultraviolet visible spectrometer 22 through the two-in-one optical fiber 21 for spectrum acquisition; the main controller 15 receives the output LIBS spectrum information of the high-resolution high-sensitivity uv-vis spectrometer 22 (in this embodiment, 3 LIBS spectra obtained in 1 second are averaged and then analyzed), and qualitatively and quantitatively analyzes the elemental composition and content of the point according to the spectral line position and intensity relationship until the micro-area LIBS analysis of the entire a×b point is completed;
(3) Micro-area laser desorption mass spectrometry fine analysis
The main controller 15 sends a command to the time sequence controller 17, sets the working frequency (1 MHz in this embodiment) of the ultraviolet ultrafast pulse LIBS laser 14 and starts; the main controller 15 sends out an instruction to the scanning controller 39 to drive the ultraviolet microscope objective 36 arranged on the three-dimensional high-precision scanning platform 32 to perform S-shaped scanning the same as that of the step (1) according to the recorded three-dimensional coordinates of A multiplied by B scanning points, so as to finish the number A multiplied by B of the scanning points of the same micro-area;
for each scanning point, the high-repetition-frequency femtosecond-level ultraviolet pulse laser emitted by the ultraviolet ultrafast pulse LIBS laser 14 along the LIBS emission optical axis 47 is expanded by the pulse laser beam expander 19, reflected by the ultraviolet dichroic mirror 28 and then transmitted along the emission optical axis 26, reflected by the ultraviolet visible polychromatic mirror 30 and then travels along the main optical axis 29, and is focused to a focusing point 34 of the planetary detection target 33 by the ultraviolet microscope objective 36; the high temperature and high pressure formed on the surface of the focusing point 34 ablates and unattached on the focusing point 34, and continuous plasma particle aerosol is excited; the main controller 15 starts the transport air pump 44, the ICP air pump 45 and the mass spectrum air pump 46 according to the set initial air pumping speed; when the three air pumps are started, plasma aerosol generated by laser ablation and desorption of the ultraviolet ultrafast pulse LIBS laser 14 enters the capillary 38 under the drive of the planetary atmosphere in an open environment to form an in-pipe plasma particle stream 37, and flows to the ICP assembly 7 along the capillary 38, the flow speed of the in-pipe plasma particle stream is related to the air extraction speed of the transport air pump 44, the air extraction speed is monitored by the flow meter 43, the reading of the real-time flow meter 43 is transmitted to the main controller 15, and the main controller 15 changes the air extraction speed of the transport air pump 44 according to the reading so as to form a stable plasma particle stream 37. The plasma particle stream 37 flows into the return pipe 41 under the bearing of the planet atmosphere, reaches the cone tip position of the sampling cone 40, and the planet atmosphere is extracted through the return pipe 41 and returns to the planet open atmosphere environment; the plasma particle flow 37 forms an enrichment area 42 at the cone tip position of the sampling cone 40, enters the sampling cone 40, passes through the cone hole of the sampling cone 40, passes through the interception cone 2 and enters the ICP assembly 7; the ICP assembly 7 carries out secondary high-temperature plasma ionization on the plasma particle stream 37, sends the plasma particle stream into the separation cone 6, and then enters a mass analyzer of the mass spectrometer 4, wherein the mass analyzer separates out different element particles, and the different element particles are detected and counted by the mass spectrometer detector 5; the main controller 15 obtains the count value for analysis to obtain the composition and the accurate content of the elements at the scanning point; until the micro-area mass spectrum analysis of the whole A multiplied by B point is completed;
(4) Micro-region substance analysis light mass spectrum information fusion
And (3) the main controller 15 fuses the information in the steps (1) to (3) to finish fine analysis of the micro-area substances, namely, three-dimensional morphology distribution of the micro-area is obtained altogether, and n-wavelength ultraviolet laser Raman images, m-spectrum ultraviolet laser induced fluorescence hyperspectral images, LIBS element coarse content distribution images and mass spectrum element fine distribution images of A multiplied by B scanning points on the three-dimensional morphology distribution are obtained.
Claims (1)
1. An in-cabin detection system of a planet vehicle for finely analyzing substances in a micro-area consists of a mass spectrum subsystem (2), an optical head (27), an ultraviolet ultrafast pulse LIBS laser (14), an ultraviolet single longitudinal mode Raman laser (16), a high-resolution high-sensitivity ultraviolet visible spectrometer (22), a time sequence controller (17) and a main controller (15); the method is characterized in that:
the optical head (27) comprises an LIBS optical fiber coupling mirror (9), an optical fiber coupler (11), a receiving pinhole (12), an ultraviolet visible beam expander (13), a cut-in controller (18), a pulse laser beam expander (19), an emitting optical fiber coupler (23), an emitting pinhole (24), an ultraviolet beam expander (25), an ultraviolet dichroic mirror (28), an ultraviolet visible polychromatic mirror (30), an LIBS cut-in reflector (31), a three-dimensional high-precision scanning platform (32), an ultraviolet microscope objective (36) and a scanning controller (39); the optical head (27) is provided with a test window (35) for testing; the ultraviolet microscope objective (36) is arranged on the three-dimensional high-precision scanning platform (32) and can be driven by the scanning controller (39) to perform three-dimensional fine movement;
the mass spectrum subsystem (2) comprises an auxiliary air supply device (3), a mass spectrometer (4), a mass spectrum detector (5), a separation cone (6), an ICP assembly (7), a interception cone (8), a capillary tube (38), a sampling cone (40), a return tube (41), a flowmeter (43), a transport air pump (44), an ICP air pump (45) and a mass spectrum air pump (46);
the ultraviolet single longitudinal mode Raman laser (16) is used for Raman molecular imaging and fluorescence hyperspectral imaging, stokes wave number frequency shift of most of Raman molecules pumped by shorter ultraviolet wavelength is still in the ultraviolet range, and meanwhile, most of fluorescence spectrum of laser is in the visible spectrum; therefore, the ultraviolet Raman laser is selected to excite Raman and fluorescence spectra and simultaneously have a certain degree of separation; the ultraviolet single longitudinal mode Raman laser (16) is an optical fiber output and is coupled into an emission optical axis (26) of the optical head (27) through an emission optical fiber (20) and an emission optical fiber coupler (23);
the ultraviolet ultrafast pulse LIBS laser (14) has two working modes: a low repetition frequency mode of less than 10Hz is used as a LIBS laser source for exciting LIBS signals of the planetary detection targets (33) to perform element composition coarse analysis; the high-repetition frequency mode above 5 kilohertz is used for transporting laser desorption particles to a mass spectrum subsystem (2) to carry out fine analysis on constituent elements of a planetary detection target (33);
the particle transporting module consists of a intercepting cone (8), a sampling cone (40), an ICP air pump (45), a capillary tube (38), a reflux tube (41), a transporting air pump (44) and a flowmeter (43), and can transport laser desorption particles to the ICP assembly (7) with high efficiency in a planetary open environment; the interception cone (8), the sampling cone (40) and the ICP air pump (45) belong to inlet component parts of the ICP assembly (7), and mainly complete efficient enrichment of particles in an enrichment area (42) and entering the ICP assembly (7) before entering the ICP assembly (7); an ICP air pump (45) is connected between the interception cone (8) and the sampling cone (40), and can be pumped into high vacuum by the ICP air pump (45) to form negative pressure so as to facilitate the transportation of plasma particle flow (37); the capillary tube (38), the return tube (41) and the transportation air pump (44) can realize that plasma aerosol generated by laser ablation and desorption of the ultraviolet ultrafast pulse LIBS laser (14) enters the capillary tube (38) under the bearing of the planet atmosphere to form an in-tube plasma particle flow (37) and carry out high-efficiency transportation; the function of the return pipe (41) is to separate the planet atmospheric carrier molecules entering the capillary (38) from the in-pipe plasma particle flow (37) and to withdraw the planet atmospheric carrier molecules by the transport air pump (44) and return to the planet atmospheric environment; the ICP assembly (7) carries out secondary high-temperature plasma ionization on a plasma particle stream (37) conveyed by the particle conveying module and sends the plasma particle stream to a separation cone (6) in the mass spectrometer (4), and the auxiliary air supply device (3) is used for cooling a high-temperature torch tube in the ICP assembly (7); the mass spectrum air pump (46) is used for pumping the region between the separation cone (6) and the mass analyzer in the mass spectrometer (4) into high vacuum so as to effectively enter the mass analyzer by utilizing the secondary high-temperature plasma output by the ICP assembly (7); the mass analyzer separates out different element particles, and the mass analyzer is detected and analyzed by the mass spectrum detector (5);
the high-resolution high-sensitivity ultraviolet visible spectrometer (22) is formed by multiplexing LIBS with laser Raman fluorescence spectrum detection, the spectrum range is 220-900nm, the whole spectrum range is divided into three channels, the ultraviolet spectrum range is 220-355 nm, the visible spectrum range is 360-580nm, and the near infrared spectrum range is 580-900nm, so that the optical resolution of the whole spectrum range is 0.2nm on average; because the excitation wavelength of the laser Raman and the fluorescence is 360nm, the laser Raman and the fluorescence multiplex the second channel, namely 360-580nm; because the LIBS signal excited by the femtosecond laser is weaker and the Raman signal is also weaker, the requirements of high sensitivity are considered in all three channels, and the sensor array selects an enhanced charge coupled device ICCD; LIBS and laser Raman fluorescence spectrum signals are respectively coupled into a high-resolution high-sensitivity ultraviolet visible spectrometer (22) through two input optical fibers of a two-in-one optical fiber (21) for spectrum signal acquisition;
the three control ports of the time sequence controller (17) are respectively connected with an ultraviolet single longitudinal mode Raman laser (16), an ultraviolet ultrafast pulse LIBS laser (14) and an external trigger port of a high-resolution high-sensitivity ultraviolet visible spectrometer (22) and are used for setting the working frequency of the ultraviolet ultrafast pulse LIBS laser (14) and the opening time delay between the ultraviolet ultrafast pulse LIBS laser (14) and the high-resolution high-sensitivity ultraviolet visible spectrometer (22); setting the synchronization of the ultraviolet single longitudinal mode Raman laser (16) and the high-resolution high-sensitivity ultraviolet visible spectrometer (22), namely starting the high-resolution high-sensitivity ultraviolet visible spectrometer (22) to collect at the moment of starting the ultraviolet single longitudinal mode Raman laser (16);
the main controller (15) can send control instructions to the access controller (18), the time sequence controller (17) and the scanning controller (39); for receiving flow value information of a flow meter (43); controlling the pumping speeds of the transport air pump (44), the ICP air pump (45) and the mass spectrum air pump (46); setting the exposure time of the high-resolution high-sensitivity ultraviolet visible spectrometer (22) and receiving the spectrum data output by the high-resolution high-sensitivity ultraviolet visible spectrometer (22); starting and receiving mass spectrum data output by a mass spectrum detector (5);
the LIBS receiving optical axis (10), the transmitting optical axis (26), the main optical axis (29) and the LIBS transmitting optical axis (47) are coplanar, the main optical axis (29) is parallel to the LIBS transmitting optical axis (47), and is perpendicular to the LIBS receiving optical axis (10) and the transmitting optical axis (26).
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| CN112345477A (en) * | 2020-10-11 | 2021-02-09 | 嘉兴天培智能检测科技有限公司 | Calibration system and method for calibrating gas phase concentration of laser-induced fluorescence measurement |
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