CN103487165B - Explosive fusion cast process process internal Temperature Distribution test macro - Google Patents
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- CN103487165B CN103487165B CN201310432117.2A CN201310432117A CN103487165B CN 103487165 B CN103487165 B CN 103487165B CN 201310432117 A CN201310432117 A CN 201310432117A CN 103487165 B CN103487165 B CN 103487165B
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Abstract
The invention discloses a kind of explosive fusion cast process process internal Temperature Distribution test macro, by optical fiber Bragg grating sensor array, input and demodulating equipment, service forms with supervising device and explosive casting apparatus four part, optical fiber Bragg grating sensor array is that serpentine arrangement is formed by the optical fiber it being arranged several grating sensors, to be fixed in 1/2 in explosive casting apparatus on axial plane, wherein grating sensor keeps at a certain distance away setting, and in array distribution, input and demodulating equipment are positioned at outside explosive casting apparatus, with Fiber connection, service and supervising device circuit connection signal detect and demodulating equipment.The present invention effectively shields the elasto-optical effect of Bragg grating pair THERMAL STRESS RESPONSE, solely can carry out perception and the measurement of temperature signal, to carry out continuously the internal temperature field situation of change of explosive fusion-casting process, multiple spot monitoring.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relating to a kind of test macro for testing interior temperature distribution in explosive fusion cast process process.More particularly, the present invention relates to a kind of continuous print be built in explosive casting system, the distributed optical fiber grating temperature-measuring system of multiple spot.
Technical background
Temperature and temperature field are the problems that explosive fusion cast process process and mechanism law study answer first concern and emphasis assurance, research and the main parameters controlling explosive crystallization and freezing process and the formation of anomalous mass feature, relate to the temperature dynamic change, environment temperature etc. of the temperature of explosive suspending liquid (or fused solution), process of setting, be presented as and the temperature of time, process covariant and temperature field.A large amount of practice shows, temperature and temperature field extensively associate internal, the Basic Problems such as explosive fusion cast process mechanism, molding structure and quality, its change by basic process Characteristic and law shaping for direct appreciable impact castexplosive, as crystallization property, solidification law, shrinking law, qualitative character, abnormal formation rule etc.If explosive internal temperature field is uneven can produce thermal stress, thermal stress is comparatively large and discharge insufficient explosive foundry goods that will cause and crack.Even if do not form crackle in forming process, also in use or storage process, easily damage and failure may be caused due to there is larger internal residual stress.The too small thermograde of explosive fusion-casting process internal layer can cause generating loose column or dendritic crystalline region, affects its capability and performance and detonation property.
Therefore, the temperature of on-line monitoring explosive suspending liquid, the temperature dynamic change of process of setting, to the quality improving shaping powder column, eliminating crackle, shrinkage porosite etc. has important meaning.And along with the development of explosive fusion cast process technology, and improving constantly that Forming Quality is required, the chilling temperature be badly in need of in continuous coverage explosive coagulation forming process provides the important information of process modification.But due to the poor stability of explosive, the technology of on-line monitoring explosive fusion cast process temperature is still immature so far.
For testing the temperature changing regularity of explosive melt inside, needing to build a set of successional temp measuring system, meeting the requirement of the following aspects: 1) this cover temp measuring system can monitor the temperature changing regularity of explosive melt inside continuously; 2) temperature measurement accuracy can reach actual operation requirements; 3) because explosive is dangerous substances, and in a heated state, therefore this cover temp measuring system should meet the safety requirements of test.
The method of now widely used measurement explosive fusion cast process process internal temperature is embedded thermocouple thermometry and ultrasound thermometry, all can be every research and provides basic physical basis.As temperature sensor, thermopair has that measurement range is wide, temperature-responsive is fast, structure is simple, easy to use, by the little advantage of medium influence.Its principle utilizes the thermoelectric effect between semiconductor material to realize induction, the test of temperature.But exist in following problem: 1) its heat transfer character and explosive difference greatly, have a certain impact to the temperature field of measurand explosive simultaneously; 2) its thermometric process can produce thermoelectric effect, form electric current in the loop, and the electrostatic sensitivity of explosive is higher, does not meet the security requirement of thermometric experiment; 3) temperature measurement accuracy is lower, and generally can only reach 0.1 DEG C, and most explosive solid-liquid phase in version interval is less, if TNT is 78-80 DEG C, DNAN is 89-93 DEG C, can not measure more accurately its Tc; 4) volume is comparatively large, and can not accurately locate the position specific to space, namely spatial positioning accuracy is low.Ultrasonic temperature measurement technology has the advantage that precision is high, sensitivity good, measurement range is wide, contactless, is also used to the temperature monitoring of explosive fusion-casting process.Its principle utilizes the single-valued function relation of ultrasonic propagation velocity and explosive temperature to realize the measurement of explosive internal temperature field.But also have the following disadvantages: 1) its sensitive material has high-temperature brittleness, therefore more difficultly to choose; 2) acoustic signals raises with temperature and decays, therefore ultrasonic temperature measurement precision is at high temperature poor; 3) acoustic signals is subject to external interference, causes detection curve to occur linear drift, i.e. poor anti jamming capability.
In view of these problems occurred when thermopair and ultrasound thermometry are applied in explosive fusion-casting process, the current temperature monitoring method to explosive fusion-casting process expands research both at home and abroad, its focus is high response speed, pinpoint accuracy, high temperature-measuring range, can be applied to the temperature sensor technology of explosive, and wherein optical fiber grating temperature-measuring technology has advantage clearly.
Optical fiber grating temperature-measuring technology is development along with the communication technology and optical fiber and develops rapidly, is a newer technology.Its ultimate principle utilizes the detection to the movement of raster center reflection wavelength, induction also measuring tempeature indirectly, there is the advantage of its uniqueness: 1) precision is high, its sensing process obtains heat transfer agent by the modulation of extraneous parameter to raster center wavelength, and various light intensity fluctuation can be avoided in sensor the interference of measuring accuracy; 2) antijamming capability is strong, and its measuring-signal is not by the impact of the factors such as bending loss of optical fiber, junction loss and detection instrument are aging; 3) can multiple spot, real time temperature measurement be carried out, multiple fiber grating can be set and form distributed sensing point and form distributed sensor, on a large scale, thermometric be carried out to multiple spot simultaneously; 4) volume is little, positional precision is high, easily imbeds or embeds in measured material and carry out high resolving power and large-range measuring to its internal temperature; 5) little on measured medium impact, because fiber optic fiber has non-conducting, small to the Influence of Temperature Field of medium.Based on above many merits, this technology is widely used in the thermometric of inflammable, the explosive industries such as petrochemical complex; The health monitoring of large-scale composite material and xoncrete structure; The detection of the temperature variation of cogeneration plant, warehouse heap putting material; The temperature detection of the industry such as nuclear industry, electric power strong electromagnetic occasion; Forest fire detecting and warning system etc.
But also there is problem demanding prompt solution in the application of optical fiber grating temperature-measuring technology in castexplosive field, i.e. the sensing characteristics of grating pair temperature and stress cross sensitivity.The accumulation that can cause explosive material thermal stress falls in the phase transformation before and after castexplosive solidifies and temperature, grating sensor is embedded in explosive inside, can inevitably, side by side respond to temperature and thermal stress, namely temperature and stress all can cause the drift of optical grating reflection ripple centre wavelength, cause measurement result to occur deviation.In addition, the elasto-optical effect that the thermal stress of explosive fusion-casting process causes also can impact thermometric.
For solving temperature and strain cross sensitivity problem, the impact of the solid liquid phase transition process particularly existed during thermometric, generally all simply encapsulates Bragg grating sensitizing range.Traditional packaging effect is shown in Fig. 1, one section of capillary tubing 4 is being had with cover on the optical fiber 5 of polyimide coating 6, capillary tubing 4 two-port epoxy resin 2 seals, shaft core position in the middle part of the capillary tubing 4 Bragg grating 7 being fixed on hollow, capillary tubing 4 is wrapped up completely in center, epoxy resin 2 filling of gap between the two again with a steel casing 8.But this kind of structure still has the following disadvantages, 1) conduct heat mainly through the epoxy resin that thermal conductivity is low between Bragg grating and measured medium, there is certain temperature hysteresis; 2) epoxy resin of filling in Steel Casing is large to bare fibre bonding strength, and its temperature variant thermal expansion can produce optical fiber and draw/compressive stress, and then makes the optical grating reflection wavelength in capillary tubing produce extra skew; 3) though external fiber scribbles polyimide coating, by the heat accumulation stress influence after explosive solidification process, solidification, distortion may be produced or be pulled off.
Summary of the invention
The object of this invention is to provide a kind of explosive fusion cast process process internal Temperature Distribution test macro, the encapsulating structure that this system is traditional to optical fiber Bragg raster improves, and form distributed network sensor array and be applied to explosive casting system, to carry out monitoring that is successional, multiposition point to the internal temperature field situation of change of explosive fusion-casting process.
Technical matters to be solved by this invention is effectively shielded the elasto-optical effect of Bragg grating pair THERMAL STRESS RESPONSE, solely carries out perception and the measurement of temperature signal, applied to enable optical fiber grating temperature-measuring technology in castexplosive field.
For achieving the above object, explosive fusion cast process process internal Temperature Distribution test macro of the present invention by optical fiber Bragg grating sensor array, input and demodulating equipment, serve and form with supervising device and explosive casting apparatus four part, described explosive casting apparatus is for implementing explosive fusion cast process; Described optical fiber Bragg grating sensor array is that serpentine arrangement is formed by the optical fiber it being arranged several grating sensors, to be fixed in 1/2 in explosive casting apparatus on axial plane, grating sensor wherein on optical fiber keeps at a certain distance away setting, and in array distribution, for measuring multi-point temp in explosive casting apparatus and output optical signal; Described input and demodulating equipment are positioned at outside explosive casting apparatus, with described Fiber connection, for measuring light wave and converting temperature signal to; Described service and supervising device circuit connection signal detect and demodulating equipment, for realizing Long-distance Control and display.
Wherein, described grating sensor is by Bragg grating, capillary tubing and steel casing are formed, described Bragg grating is wrapped in capillary tubing, and fill the gap between Bragg grating and capillary tubing with 703 glue, Bragg grating is fixed on the axle center place of capillary tubing, steel casing is enclosed with as containment vessel in the outside of capillary tubing, steel casing two ends filling epoxy resin, capillary tubing is adhesively fixed on the center of steel casing, and the optical fiber be fixed in outside capillary tubing, heat medium oil is filled with in space between steel casing stage casing and capillary tubing.
And then the present invention is wrapped with Teflon-clad in the coating of described optical fiber.
In the present invention, described grating sensor, as a kind of New temperature sensor of high comprehensive performance, is carry out measuring tempeature indirectly by the change of incident light wave centre wavelength in detection also demodulation Bragg grating.
The encapsulating structure that the present invention is first traditional to optical fiber Bragg raster improves; modified node method is using heat medium oil as main heat transfer medium; thermal response region is formed by capillary tubing-703 glue-Bragg grating nested structure; steel casing is as sensor protection layer; Teflon-clad, as fiber optic protection layer, finally also fixes internal layer nested structure, steel casing and Teflon-clad with epoxy bond.Modified node method can solve liquid phase in explosive fusion-casting process and cause the tender subject of Bragg raster center wavelength shift to the built-in thermal stress produced during solid transformation, only respond to temperature, and antijamming capability is strong.
Grating sensor after improvement compares with traditional fiber grating encapsulating structure, have the following advantages: 1) gap between Bragg grating and capillary tubing filled by good 703 glue of, plasticity little with cohesive strength, can cushion the radial stress for Bragg grating because capillary tubing thermal deformation produces; 2) contact area of epoxy resin and plain fiber portion is reduced, alleviate because epoxy resin thermal expansion and strong cohesive property are to the stretching of optical fiber, compression, coated Teflon-clad on optical fiber simultaneously, and bondingly with steel casing to be connected, more effectively can reduce axial tensile stress during explosive solidification; 3) between steel casing stage casing and capillary tubing, fill the heat medium oil that specific heat is little, thermal conductivity is high in space, shorten the response time of Bragg grating pair temperature; 4) with the coated optical fiber be exposed in explosive of teflon, differential contraction stress is reduced when explosive solidifies on the impact of optical fiber.
The present invention has carried out rational design, layout to the connected mode of grating sensor and space distribution then, considers the symmetry of radial heat transfer, only needs medicine grating sensor to be distributed in casting apparatus axial plane in 1/2; Multiple grating sensor unit is connected by an optical fiber, Special composition array on half " Gui " font support is fixed in serpentine, forming multiple spot distributed network is built in explosive casting apparatus, the multiple spot distribution situation of internal temperature in explosive fusion cast process process can be reflected, simple for structure, little to Influence of Temperature Field.The present invention all needs reserved certain space in the top of sensor array, bottom simultaneously, to reduce explosive solidification shrinkage, optical fiber compressive stress to the impact of test process, thus monitor the temperature space distributed intelligence of explosive casting apparatus inside in explosive fusion-casting process more all sidedly.Achieve real-time, dynamic monitoring castexplosive internal temperature Evolution, continuity thermometric can be realized.
The input that test macro of the present invention uses and demodulating equipment preferred FBG-3000 type Fibre Optical Sensor measuring instrument, its major function is the measurement realizing multi-channel fiber Bragg grating wavelength, the measurement (becoming temperature by wavelength convert) of physical quantity, analyze spectrum, the measurement that EFPI chamber is long, the teletransmission of Bragg grating wavelength and spectrum, the display of data and playback.
The service that test macro of the present invention adopts and supervising device comprise system configuration software and display, and its function is mainly for Data Acquisition & Processing Software provides operation platform, carries out long-range display and control.
Explosive fusion cast process process internal Temperature Distribution test macro of the present invention is on the basis that optical fiber Bragg raster is generally applied, its encapsulating structure is improved, and by the grating sensor composition multiple spot distributive array network after multiple improvement, fix, be built in explosive casting apparatus, the temperature data of the multiple distributed points of continuous acquisition explosive fusion-casting process also exports input and demodulating equipment to broadband optical signal, realizes the measurement of Bragg grating wavelength and wavelength convert is become temperature.Test macro of the present invention effectively shields the elasto-optical effect of Bragg grating pair THERMAL STRESS RESPONSE, solely can carry out perception and the measurement of temperature signal, to test the development law in its temperature field, be applicable to continuous, the multiple spot distributed measurement of explosive fusion-casting process Temperature Distribution, have the advantages that precision is high, security good, continuity is good, antijamming capability is strong, obtain good application in castexplosive field.
Accompanying drawing explanation
Fig. 1 is the encapsulating structure schematic diagram of existing grating sensor.
Fig. 2 is the encapsulating structure schematic diagram of grating sensor of the present invention.
Fig. 3 is the A-A cut-open view of Fig. 2.
Fig. 4 is the B-B cut-open view of Fig. 2.
Fig. 5 is the C-C cut-open view of Fig. 2.
Fig. 6 is the structural drawing of explosive fusion cast process process internal Temperature Distribution test macro of the present invention.
Fig. 7 is the spatial distribution map of optical fiber Bragg grating sensor array in Fig. 6.
Fig. 8 is temperature-time curve comparison diagram that No. 1 position uses grating sensor of the present invention, traditional raster sensor and reference temperature measurement amount respectively in optical fiber Bragg grating sensor array.
Fig. 9 is temperature-time curve comparison diagram that No. 2 positions use grating sensor of the present invention, traditional raster sensor and reference temperature measurement amount respectively in optical fiber Bragg grating sensor array.
Figure 10 is temperature-time curve comparison diagram that No. 3 positions use grating sensor of the present invention, traditional raster sensor and reference temperature measurement amount respectively in optical fiber Bragg grating sensor array.
Embodiment
Explosive fusion cast process process internal Temperature Distribution test macro involved in the present invention is divided into four parts: optical fiber Bragg grating sensor array 10, input and demodulating equipment 30, service and supervising device 40 and explosive casting apparatus 20.This overall system framework is as Fig. 6.
Described explosive casting apparatus 20 is made up of the explosive in mould, Technological cover, insulated feeder and mould, and major function is the fusion cast process and the placement optical fiber Bragg grating sensor array 10 that realize explosive, to realize the monitoring of temperature.Described optical fiber Bragg grating sensor array 10 by an optical fiber by several grating sensor units in series together, and is arranged in array, for measuring multi-point temp in explosive casting apparatus 20 and output optical signal in serpentine.Described input and demodulating equipment 30 are FBG-3000 type Fibre Optical Sensor measuring instrument, be positioned at outside explosive casting apparatus 20, and with the Fiber connection of optical fiber Bragg grating sensor array 10, function comprise realize multi-channel fiber Bragg grating wavelength measurement, physical quantity measurement (becoming temperature by wavelength convert), analyze the long measurement in spectrum, EFPI chamber, optic fiber grating wavelength and the teletransmission of spectrum and the display of data and playback.Described service and supervising device 40 comprise system configuration software and display, are connected with demodulating equipment 30 circuit with input, for Data Acquisition & Processing Software provides operation platform, for realizing Long-distance Control and display.
Consider the symmetry of radial heat transfer, optical fiber Bragg grating sensor array 10 only to need to be distributed in explosive casting apparatus 20 axial plane in 1/2.Fig. 7 gives the concrete spatial distribution map of optical fiber Bragg grating sensor array 10 in explosive casting apparatus 20.An optical fiber 12 keeps at a certain distance away a grating sensor 11 is set, arrange 20 altogether.The support 13 of one and half " Gui " font is welded into the steel bar of 2mm, be fixed on support 13 by "S" shape for optical fiber 12, make 20 grating sensors 11 with 4 × 5 arrayed, sensor longitudinal pitch is 80mm, 100mm, 100mm, 80mm, horizontal spacing 16mm, grating sensor 11 and support 13 contact site nylon wire are fastened, and form optical fiber Bragg grating sensor array 10.Be placed on by optical fiber Bragg grating sensor array 10 in explosive casting apparatus 20, the space of the top of array, all reserved 20mm in bottom, to reduce explosive solidification shrinkage, optical fiber compressive stress to the impact of test process.
The structure of grating sensor 11 as shown in Figure 2.First, the Teflon-clad 1 of, good heat resistance higher in the polyimide coating 6 outer cladding last layer intensity of optical fiber 5.Consider that grating sensor needs thermal response rates faster, the capillary tubing 4 of the Bragg grating 7 part diameter 0.6mm of diameter 0.2mm on optical fiber 5 is wrapped to form sandwich construction, and 703 lower for two lamellar spacing bonding strengths glue 9 are filled, Bragg grating 7 is fixed on the axle center place of capillary tubing 4.Select the steel casing 8 of steel pipe as aforementioned sandwich construction of long 2mm, wall thickness 0.2mm, carry out bonding with the epoxy resin 2 that bonding strength is high at two ends place between steel casing 8 with aforementioned sandwich construction.Sandwich because epoxy resin has air bubble in the curing process, cause that bonding strength is uneven, specific heat is higher, so its effect just fixes Bragg grating-capillary tubing structure in steel casing 8 center, can not, as heat transfer medium, heat medium oil 3 (GB/T4016-83) be selected to be filled between steel casing 8 and capillary tubing 4 in addition.The characteristic that heat medium oil specific heat is little, thermal conductivity is high is suitable as heat transfer medium.Teflon-clad 1 on optical fiber 5, deeply in steel casing 8, contacts with epoxy resin 2, fixes.Fig. 3, Fig. 4, Fig. 5 sets forth the A-A cut-open view of grating sensor 11 in Fig. 2, B-B cut-open view and C-C cut-open view.
The encapsulating structure of above-mentioned grating sensor 11 has following reasonable structure: 1) little, good 703 glue of plasticity of cohesive strength can cushion the radial stress because capillary tubing distortion produces; 2) epoxy resin and optical fiber contact area little, reduce because its thermal expansion and strong cohesive property are to the stretching of optical fiber, compression, and be connected bonding with steel casing for Teflon-clad, drawing stress vertically when more effectively reducing explosive solidification; 3) heat medium oil that specific heat is little, thermal conductivity is high shortens the response time of Bragg grating pair temperature; 4) be exposed to coated Teflon-clad on the optical fiber in explosive, reduce when explosive solidifies differential contraction stress to the impact of optical fiber.
The course of work of explosive fusion cast process process internal Temperature Distribution test macro is: 1) according to each assembly of Fig. 6 mounting test system, runs FS-3000 software systems, and fusing explosive is waited to cast.2) select single channel measurement pattern, normal temperature demarcation (initial temperature and initial wavelength) is carried out to each Bragg grating of series connection, and set scale factor in parameter configuration.3) castable explosive melt is in mould, starts timing, with certain hour step-length image data in software systems simultaneously.4) be cooled to end experiment after normal temperature until explosive, playback of data, dismantles Bragg grating after slow heat fused explosive.
Fix two groups of optical fiber Bragg grating sensor arrays in mould inner axes position in advance, wherein one group adopts the grating sensor of common encapsulating structure shown in Fig. 1, and another group adopts the grating sensor of the modified node method shown in Fig. 2.Every group pattern is provided with 3 Bragg gratings, and wherein bottom, middle part and top are respectively 1,2 and No. 3 position.In two groups, two Bragg gratings of same level position are as far as possible close.For the thermometric effect of contrast Bragg grating, near each temperature measurement location, be fixed with thermometer.
Adopt pipeline steam that carrier explosive is heated to 120 DEG C, add solid phase particles, be injected into after being mixed in mould, treat that explosive has been cast and namely start timing, the data acquiring frequency 3 times/min of Bragg grating and thermometer, draws out the temperature variations of each Bragg grating and its reference temperature(TR) meter as Fig. 8, Fig. 9 and Figure 10.
As can be seen from three width temperature-time curve comparison diagrams, along with the decline of temperature, it is increasing that the Bragg grating thermometric effect of common encapsulating structure is subject to heat accumulation stress influence, and the optical fiber Bragg raster of modified node method test effect is comparatively close to actual.Therefore the optical fiber Bragg raster after the present invention's improvement encapsulates, cascaded structure can effectively be tested the castexplosive temperature field that there is solidification process, analyze.
Claims (4)
1. explosive fusion cast process process internal Temperature Distribution test macro, it is characterized in that by optical fiber Bragg grating sensor array, input and demodulating equipment, service forms with supervising device and explosive casting apparatus four part, described optical fiber Bragg grating sensor array is that serpentine arrangement is formed by the optical fiber it being arranged several grating sensors, to be fixed in 1/2 in explosive casting apparatus on axial plane, grating sensor wherein on optical fiber keeps at a certain distance away setting, and in array distribution, described input and demodulating equipment are positioned at outside explosive casting apparatus, with described Fiber connection, described service and supervising device circuit connection signal detect and demodulating equipment,
Wherein, described grating sensor comprises Bragg grating, capillary tubing and steel casing, described Bragg grating is wrapped in capillary tubing, and fill the gap between Bragg grating and capillary tubing with 703 glue, Bragg grating is fixed on the axle center place of capillary tubing, steel casing is enclosed with as containment vessel in the outside of capillary tubing, steel casing two ends filling epoxy resin, capillary tubing is adhesively fixed on the center of steel casing, and the optical fiber be fixed in outside capillary tubing, heat medium oil is filled with in space between steel casing stage casing and capillary tubing.
2. explosive fusion cast process process internal Temperature Distribution test macro according to claim 1, is characterized in that being wrapped with Teflon-clad in the coating of described optical fiber.
3. explosive fusion cast process process internal Temperature Distribution test macro according to claim 1, is characterized in that all reserved certain space in the top of described optical fiber Bragg grating sensor array and explosive casting apparatus, bottom.
4. explosive fusion cast process process internal Temperature Distribution test macro according to claim 1, is characterized in that described input and demodulating equipment are FBG-3000 type Fibre Optical Sensor measuring instrument.
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| CN106706075A (en) * | 2015-07-21 | 2017-05-24 | 张银强 | Method of measuring the position of the continuous casting molten steel liquid surface position with fiber optical grating sensor |
| CN106645281B (en) * | 2017-02-21 | 2019-04-19 | 西安近代化学研究所 | Gel state cloud detonator laboratory high temperature ageing experimental system |
| CN106918297A (en) * | 2017-03-29 | 2017-07-04 | 西安近代化学研究所 | A kind of method that filling explosive wastewater charge constitution damages real-time monitoring |
| CN107512996B (en) * | 2017-09-06 | 2019-07-23 | 西安近代化学研究所 | A kind of castexplosive digitlization research and development manufacturing method |
| CN109765258B (en) * | 2019-01-09 | 2021-07-23 | 上海公路桥梁（集团）有限公司 | Method for monitoring the compaction temperature of asphalt paving |
| CN110108744B (en) * | 2019-05-08 | 2021-10-08 | 西安近代化学研究所 | Explosive classification method based on thermal accelerated aging test |
| CN110132122B (en) * | 2019-05-23 | 2020-03-17 | 西安电子科技大学 | Solid engine grain strain measurement method based on full-flexible large strain sensor |
| CN111795994A (en) * | 2020-04-30 | 2020-10-20 | 中山市精量光电子科技有限公司 | Plug-in fiber bragg grating water seepage monitoring sensor |
| CN113959579A (en) * | 2021-10-27 | 2022-01-21 | 西安工业大学 | Explosive internal temperature field measuring device |
| CN118031833A (en) * | 2024-02-02 | 2024-05-14 | 南通理工学院 | Burying method of pavement structure response dynamic perception monitoring system |
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| CN1206194C (en) * | 2002-06-28 | 2005-06-15 | 长沙矿冶研究院 | Method and device for preparing black-TNT mixed fusion cast explosive in wet mode |
| CN1916681A (en) * | 2006-08-30 | 2007-02-21 | 暨南大学 | Embedment structure of optical fiber and embedment method for enhancing cohesive force between optical fiber and packaging material |
| CN201955172U (en) * | 2010-12-09 | 2011-08-31 | 江苏联通电缆有限公司 | Encapsulated high temperature and stress resistant fiber grating temperature sensor |
| KR101209627B1 (en) * | 2011-04-29 | 2012-12-07 | 국방과학연구소 | Optical fiber sensor system using an optical spectrometer |
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