CN206804519U - Environmental gas remote sensing is equipped after multi-parameter mine calamity - Google Patents
Environmental gas remote sensing is equipped after multi-parameter mine calamity Download PDFInfo
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- CN206804519U CN206804519U CN201621144869.4U CN201621144869U CN206804519U CN 206804519 U CN206804519 U CN 206804519U CN 201621144869 U CN201621144869 U CN 201621144869U CN 206804519 U CN206804519 U CN 206804519U
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- 230000007613 environmental effect Effects 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 50
- 238000004891 communication Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims description 23
- 239000004065 semiconductor Substances 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 241000790917 Dioxys <bee> Species 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 231100000331 toxic Toxicity 0.000 abstract description 2
- 230000002588 toxic effect Effects 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 238000009826 distribution Methods 0.000 abstract 1
- 238000004880 explosion Methods 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000002341 toxic gas Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses environmental gas remote sensing after a kind of multi-parameter mine calamity to equip.The equipment is mainly used in underground Post disaster relief, mainly including generating laser, laser pickoff, control process unit, display screen and communication interface；Equipment can be measured using open air chamber by laser to the multiple gases concentration in certain distance in environment.The accident such as fire damp blast and fire; a large amount of toxic and harmful gas can be produced; and consume substantial amounts of oxygen; the application of the equipment can make to search after mine calamity, rescue personnel knows the various gas concentrations and gas characteristic distributions for not reaching region in advance; adopt an effective measure in advance; it is allowed to produce the harm of a large amount of toxic gases from accidents such as gas explosion and fire, protects rescue personnel's life, improve rescue efficiency.
Description
Technical field
Environmental gas remote sensing after a kind of multi-parameter mine calamity is the utility model is related to equip, the equipment be related to laser technology,
The fields such as spectral analysis technique, signal processing technology.
Background technology
Coal is China's main energy sources, accounts for primary energy 70%.Coal industry is high risk industries, gas, fire, top
The accidents such as plate, coal dust annoying Safety of Coal Mine Production.After accident occurs, down-hole accident field condition is grasped in time, is correct, has
Effect rescue, reduce the key of casualties.The accident such as fire damp blast and fire, can produce a large amount of CO, CO2, CH4Etc. poisonous
Pernicious gas, consume a large amount of O2.As scene of the accident toxic and harmful gas concentration superelevation, O2When content is relatively low, search can be endangered, rescued
The life of shield personnel, therefore when carrying out underground Post disaster relief, should be first to the Minepit environment air in the certain distance that does not reach
Danger is detected.Surrounding air method for detecting includes short distance remote sensing monitoring, feeler lever detecting and throwing in existing rescue work
Detecting.Short distance remote sensing monitoring applied to mine can only be detected to methane concentration at present, it is impossible to it is dense to detect other gases
Degree and environment temperature, and typically detecting distance is no more than 30 meters；Feeler lever detecting is that methane transducer is fixed at the top of feeler lever,
Feeler lever is extended and does not reach region and is detected, for the method by feeler lever length limitation, detecting efficiency is low, influences rescue work effect
Rate；Throwing detecting is to throw methane transducer to tunnel by special throwing equipment not reach region, then environment is entered
Row detecting, be affected by human factors larger due to throwing equipment operation, sensor degradation rate is high, and it is low to throw success rate, detect away from
From though feeler lever mode is higher than, practical application effect is unsatisfactory.So need to can be applied at present underground Post disaster relief, can
It is carrying with, underground CO, CO can be detected at a distance2, CH4, O2Etc. the new detection equipment of gas concentration.
Utility model content
The utility model purpose is after providing a kind of multi-parameter mine calamity that environmental gas remote sensing is equipped.The equipment is main
Including generating laser, laser pickoff, control process unit, display screen and communication interface；Equipment, can be right using open air chamber
Multiple gases concentration carries out remote sensing monitoring；Control process unit is responsible for controlling laser transmitter projects laser, handles laser pick-off
The signal that device returns obtains gas concentration and reverberation distance, and control communication interface is communicated, and control display screen is shown；Control
Processing unit and generating laser, the descending unidirectional connection communication of display screen；Control process unit is up unidirectional with laser pickoff
Connection communication；Control process unit is bi-directionally connected with communication interface to communicate；Generating laser is responsible for swashing for ranging and gas-monitoring
The transmitting of optical signal, laser is produced by lasing light emitter, a lasing light emitter can produce the laser for detecting multiple gases；Laser connects
Receive device to be responsible for receiving laser signal, laser signal is converted into electric signal, electric signal is one-way transmitted to control process unit；Dress
It is standby that there is laser ranging function；Equipment has automatically scanning monitoring function, and equipment can launch the laser of multiple different directions automatically；
The generating laser of equipment is using the generating laser in adjustable Laser emission direction, and control process unit is to scan monitoring mode
Laser emission direction is controlled, carries out different directions gas concentration and apart from monitoring.
1. the equipment further comprises：It is equipped for explosion-proof type equipment.
2. the equipment further comprises：The lasing light emitter of the generating laser of equipment includes semiconductor laser with tunable；
The controlled processing unit control of semiconductor laser with tunable sends the laser of different wave length；Laser pickoff is received and reflected
Laser, laser signal is converted into electric signal, control process cell processing electric signal obtains corresponding gas concentration.
3. the equipment further comprises：Generating laser can send methane, carbon monoxide, carbon dioxide and oxygen molecule
The laser of the different wave length of absorption peak.
4. the equipment further comprises：The display screen of equipment uses colorful display screen, can be controlled by control process unit
Show different color gas concentrations and perspective three dimensional spatial model.
5. the equipment further comprises：The communication interface of equipment includes wireless communication interface.
Brief description of the drawings
The composition schematic diagram of embodiment 1 is equipped in environmental gas remote sensing after Fig. 1 multi-parameter mine calamities.
The principle schematic of embodiment 1 is equipped in environmental gas remote sensing after Fig. 2 multi-parameter mine calamities.
The composition schematic diagram of embodiment 2 is equipped in environmental gas remote sensing after Fig. 3 multi-parameter mine calamities.
The principle schematic of embodiment 2 is equipped in environmental gas remote sensing after Fig. 4 multi-parameter mine calamities.
The semiconductor laser with tunable arrangement architecture of embodiment 2 is equipped in environmental gas remote sensing after Fig. 5 multi-parameter mine calamities
Schematic diagram.
Fig. 6 signal generator principle schematics.
Fig. 7 digital phase discriminator principle schematics.
Environmental gas remote sensing armament-related work flow chart after Fig. 8 multi-parameter mine calamities.
Embodiment
The embodiment 1 of the remote sensing equipment is as shown in figure 1, equipment component units include：
1. control process unit (101)：It is responsible for control generating laser (109) transmitting laser；Handle laser pickoff
(112) signal returned obtains gas concentration and reverberation distance；Control communication interface (116) is communicated；Control display screen
(119) show；Receive the operation signal of button (120) and handled accordingly.Concrete composition includes：
(1) core processor (102), using Samsung S3C2440 processors, S3C2440 is based on the micro- of ARM920T kernels
Processor,；S3C2440 has 3 UART interfaces, 2 SPI interfaces, 2 USB interfaces, 1 IIC-BUS interface；Pass through UART
Interface and digital phase discriminator (204) connection communication；, realize that drive control communicates using embedded Linux platform.
(2) power supply and clock module (103), including D/C voltage conversion and Clock management element, D/C voltage conversion use
MAX1724 series of power chips, for all chip power supplies；From 12MHz crystal oscillators.
(3) memory module (104)；Including 256M NAND Flash, a piece of 4M NOR Flash, 128M SDRAM, a piece of
The EEPROM of IIC-BUS interfaces.
(4) signal generator (105), it is responsible for producing the tune for being used to control laser transmitter projects to be used for gas concentration monitoring
Sawtooth wave control signal processed, concrete structure and operation principle illustrate in Fig. 5.
(5) phaselocked loop amplifier (106), using two modules, be each responsible for extracting gas absorption signal once, it is secondary
Harmonic wave, suppress noise using the orthogonal property of signal and noise, improve signal to noise ratio, LIA-MV-150 locks can be used mutually to put
Big device module.
(6) analog-digital converter (107), be responsible for by lock-in amplifier demodulate once, secondary analog signal is converted into counting
Word signal, using 16 multi-channel a/d converter chips of ADS8364, there are 6 fully differential input channels.
(7) digital phase discriminator (108), it is responsible to handle the distance measuring signal received, by reception signal with sending control signal
It is compared, obtains the phase difference between signal, and phase difference is sent to core processor by interface with data mode.Numeral
Phase discriminator concrete structure and operation principle illustrate in Fig. 6.
2. generating laser (109), is responsible for the transmitting of the laser signal of ranging and gas-monitoring, concrete composition includes：
(1) lasing light emitter (110) uses semiconductor laser with tunable, can send the laser of multi-wavelength, for measuring not
Same gas concentration, can use IBSG-TO5TEC series semiconductor laser with tunable, and the semiconductor laser with tunable integrates
TEC current temperatures control semiconductor element, for temperature adjustment, stabilizing wave lenth of laser and power.
(2) head (111), for controlling the direction of the launch of lasing light emitter (110) and the reception direction of laser pickoff, by core
The external MAX485 chips in heart processor SPI communication port are moved by cradle head control protocol integrated test system head, and head uses video camera
With standard supervision head, can both horizontally and vertically rotated.
3. laser pickoff (112), it is responsible for receiving laser signal, laser signal is converted into electric signal, concrete composition bag
Include：
(1) receiving lens (113), the laser for being responsible for will reflect back into are assembled to photodetector.
(2) darkroom (114), using closed cylindrical structure, inwall applies light absorbent.
(3) photodetector (115), it is responsible for the laser signal received being converted to electric signal, including light receiving element
And amplifying circuit；Light receiving element uses InGaAs PIN photodiodes, and amplifying circuit main element uses AD603, in parallel
Two voltage followers connect phaselocked loop amplifier (106) and digital phase discriminator (108) respectively.
4. communication interface (116), transmitted for Monitoring Data, including wired communication interface (117) and wireless communication interface
(118)。
(1) wired communication interface (117), main chip use the single-chip ether that DM9000, DM9000 are completely integrated
Net mac controller, the procotol on upper strata is driven by the built-in Linux of core processor to be supported.DM9000 supports 10/100M
Adaptively, 3.3V and 5V supply voltage is supported.DM9000 passes through the YL18-1080S connections of network isolation transformer interface chip
RJ45 network interfaces, realize and the physical connection of network is communicated.
(2) wireless communication interface (118), using the Wifi wireless network cards of standard USB interface, system, USB port driving and
Wifi WLAN Device Drivers realize network communication services under supporting.
5. display screen (119), it is responsible for Monitoring Data and shows that data can be shown by word or diagrammatic form, three dimensions
Gas concentration data show that different colours represent gas with various concentration by perspective model figure mode.Display screen uses 3.5 cun of coloured silks
Color LCD screen, resolution ratio 480x800, display driving software driving is carried by Linux.
6. button (120), for man-machine interaction, including equipment on ＆ off switch, monitoring start key, function setting operation key.
Fig. 2 show the principle schematic of the equipment embodiment 1.
Fig. 3 is the composition schematic diagram of the equipment embodiment 2, and the principle that Fig. 4 show the equipment embodiment 2 is shown
It is intended to.Embodiment 2 does not have head, and uses 8 semiconductor laser with tunable, and each semiconductor laser with tunable points to
Different directions, 8 semiconductor laser with tunable connection multi-channel data selectors (121), multi-channel data selector (121)
Controlled by core processor, the semiconductor laser with tunable control signal that signal generator (105) is sent is sent to difference
Semiconductor laser with tunable, so as to realize the multichannel time-sharing multiplex of signal generator (105)；1 is selected using CD4051BC 8
Bilateral analog switch, gating, 1 I/O mouth controlling switch are controlled by 3 I/O mouths of core processor (102)；COMMON IN/
OUT port is connected with signal generator (105).
Fig. 5 is the equipment semiconductor laser with tunable arrangement architecture schematic diagram of embodiment 2, each tunable partly to lead
Body laser points to different directions.
Fig. 6 is signal generator principle schematic, is mainly included：
1.DDS generators (601), it is responsible for producing ranging control sine wave signal or gas concentration monitors required sinusoidal tune
Signal processed, AD9835 Direct Digital Synthesizers can be used, SPI interface Control on Communication is passed through by core processor (102)
Signal frequency changes.
2.D/A changes (602), and being handled (102) control by core processor produces sawtooth signal, D/A can be used to change
Chip DAC0832.
3. filter circuit (603), being filtered for signal, high impedance low-noise operational amplifier LF353, output ranging control can be used
Sinusoidal modulation signal needed for sine wave signal or gas concentration monitoring.
4. adder (604), it is responsible for sawtooth signal and modulated sinusoid signal synthesizing modulated sinusoid signal, uses
In control semiconductor laser with tunable, using adder chip LM107.
5. comparator (605), it is responsible for carrier wave sinusoidal signal being converted to same frequency with the square-wave signal of phase, comparator can be used
Chip LM393.
6. frequency multiplier circuit (606), it is responsible for being produced as the square-wave signal of carrier wave sinusoidal signal frequency multiplication, can be by phase-locked loop chip
HEF4046 and counter chip CD4520 is formed.
Fig. 7 is digital phase discriminator principle schematic, and digital phase discriminator has two-way input, is produced by signal generator all the way
Shaken signal with the master of phase with frequency with modulated sinusoid signal, another way is to convert reception telecommunications by laser pick-off unit
Number.Digital phase discriminator circuit includes a local oscillation signal generator (701), and local oscillation signal generator produces one than the main signal that shakes
The lower slightly local oscillation signal of frequency；Local oscillation signal generator is mixed local oscillation signal with receiving electric signal by frequency mixer (702)
Frequently, low frequency signal is obtained, this low frequency signal carries modulation laser caused phase difference in two-way process；Digital phase discriminator leads to
Cross another frequency mixer to be mixed the main signal that shakes with local oscillation signal, obtain another mixed frequency signal, two-way frequency mixer is defeated
The mixed frequency signal gone out is sent into phase measuring apparatus (703) and carries out phase difference measurement, obtains phase data.The main bag of digital phase discriminator composition
Include：
1. local oscillation signal generator (701), output frequency 9.99MHz, VCXO CVCSO-914- can be used
0010。
2. frequency mixer (702), analog multiplier chip MC1496 can be used.
3. phase measuring apparatus (703), the GP1 of high precision time measurement chip TDC mono- can be used.
The armament-related work flow is as shown in Figure 8：
1. (801), when the monitoring start key of button (120) is pressed, core processor (102) receives signal, starts
Once monitor scanning process.
2. (802), carrying out laser ranging first, core processor (102) control signal generator (105) is producing 10M just
String ripple signal.
3. (803), sine wave signal driving lasing light emitter (110) sends the laser for detection range.Embodiment 1 is sinusoidal
Ripple signal directly drives semiconductor laser with tunable, and the sine wave signal of embodiment 2 need to pass through multi-channel data selector (121)
Behind selection path, then drive corresponding semiconductor laser with tunable.
4. (804), range laser runs into reverberation fraction of laser light and reflected, receiving lens (113) collect what is reflected
Laser is assembled to photodetector (115), photodetector (115) is converted to electric signal by the laser signal received.
5. after the processing such as the ranging electric signal that (805), digital phase discriminator (108) processing receives, amplified, mixing, obtain
Obtain sending the phase difference between control signal, phase difference sends core processor to data mode by interface.
6. (806), core processor (102) receiving phase difference data, is equipped between reverberation according to phase difference
Distance.
7. (807), core processor (102) control signal generator sends 50Hz sawtooth signal and with 50kHz's
Sinusoidal signal is modulated.
8. (808), modulated sawtooth signal driving lasing light emitter (110) sends inswept a certain gas absorption peak ripple
The laser of long scope.The sine wave signal of embodiment 1 directly drives semiconductor laser with tunable, the sine wave of embodiment 2 letter
Number need to be behind multi-channel data selector (121) selection path, then drive corresponding semiconductor laser with tunable.
9. (809), laser runs into reverberation fraction of laser light through the air of tested region and reflected, receiving lens (113)
The laser that collection reflects, which is assembled to photodetector (115), photodetector (115), changes the laser signal received
For electric signal.
10. (810), phaselocked loop amplifier (106) receives electric signal, and the modulation letter that timesharing reception signal generator provides
Number and modulated signal frequency-doubled signal, through processing extraction timesharing obtain once, second harmonic signal.
11. (811), analog-digital converter (107) will once, second harmonic signal digitlization.
12. (812), core processor (102) receive once, the data of second harmonic signal, processing obtain through light path
On the concentration for surveying gas.
13. (813), core processor control converted gas monitoring, repeat the gas concentration measurement mistake of (807) to (812)
Journey monitoring is until complete all gas concentration monitor.
14. (814), embodiment 1：Core processor (102) control head (111) drives semiconductor laser with tunable
An angle is rotated with laser pickoff；Embodiment 2：Core processor (102) control multi-channel data selector (121) choosing
Select another semiconductor laser with tunable path.(802) are repeated to the process of (813) ranging and gas concentration monitoring until complete
Into the monitoring of all set angles.
15. (815), core processor processing (102) institute angled upper acquisition distance and each gas concentration, obtain difference
Each gas concentration data of distance areas and three-dimensional spatial area
16. (816), core processor processing (102) uploads data by communication interface (116), and by showing screen display
Registration evidence, three-dimensional space model is shown in a manner of perspective model figure, different gas concentrations is shown with different colors.
Claims (6)
1. environmental gas remote sensing is equipped after a kind of multi-parameter mine calamity, it is characterised in that：Equipment mainly includes generating laser, swashed
Optical receiver, control process unit, display screen and communication interface；Equipment can be carried out using open air chamber to multiple gases concentration
Remote sensing monitoring；Control process unit is responsible for controlling laser transmitter projects laser, and the signal that processing laser pickoff returns obtains
Gas concentration and reverberation distance, control communication interface are communicated, and control display screen is shown；Control process unit is sent out with laser
The descending unidirectional connection communication of emitter, display screen；Control process unit and the up unidirectional connection communication of laser pickoff；Control process
Unit is bi-directionally connected with communication interface and communicated；Generating laser is responsible for the transmitting of the laser signal of ranging and gas-monitoring, passes through
Lasing light emitter produces laser, and a lasing light emitter can produce the laser for detecting multiple gases；Laser pickoff is responsible for receiving laser
Signal, laser signal is converted into electric signal, electric signal is one-way transmitted to control process unit；Equipment has laser ranging work(
Energy；Equipment has automatically scanning monitoring function, and equipment can launch the laser of multiple different directions automatically；The generating laser of equipment
Using the generating laser in adjustable Laser emission direction, control process unit controls Laser emission side to scan monitoring mode
To carrying out different directions gas concentration and apart from monitoring.
2. remote sensing equipment as claimed in claim 1, it is characterised in that：It is equipped for explosion-proof type equipment.
3. remote sensing equipment as claimed in claim 1, it is characterised in that：The lasing light emitter of the generating laser of equipment includes tunable
Semiconductor laser；The controlled processing unit control of semiconductor laser with tunable sends the laser of different wave length；Laser pick-off
Device receives the laser reflected, laser signal is converted into electric signal, control process cell processing electric signal obtains accordingly
Gas concentration.
4. remote sensing equipment as claimed in claim 1, it is characterised in that：Generating laser can send methane, carbon monoxide, dioxy
Change the laser of the different wave length of carbon and oxygen molecule absorption peak.
5. remote sensing equipment as claimed in claim 1, it is characterised in that：The display screen of equipment uses colorful display screen, can be by controlling
Processing unit control processed shows different color gas concentrations and perspective three dimensional spatial model.
6. remote sensing equipment as claimed in claim 1, it is characterised in that：The communication interface of equipment includes wireless communication interface.
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| CN201621144869.4U CN206804519U (en) | 2016-10-21 | 2016-10-21 | Environmental gas remote sensing is equipped after multi-parameter mine calamity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621144869.4U CN206804519U (en) | 2016-10-21 | 2016-10-21 | Environmental gas remote sensing is equipped after multi-parameter mine calamity |
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| CN206804519U true CN206804519U (en) | 2017-12-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918440A (en) * | 2018-05-30 | 2018-11-30 | 上海禾赛光电科技有限公司 | A kind of Laser stealth material system and method |
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2016
- 2016-10-21 CN CN201621144869.4U patent/CN206804519U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918440A (en) * | 2018-05-30 | 2018-11-30 | 上海禾赛光电科技有限公司 | A kind of Laser stealth material system and method |
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