CN105004751B - A kind of light extraction time set based on after laser power stability - Google Patents
A kind of light extraction time set based on after laser power stability Download PDFInfo
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- CN105004751B CN105004751B CN201510451923.3A CN201510451923A CN105004751B CN 105004751 B CN105004751 B CN 105004751B CN 201510451923 A CN201510451923 A CN 201510451923A CN 105004751 B CN105004751 B CN 105004751B
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- optical occluder
- occluder component
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Abstract
The invention discloses a kind of light extraction time set based on after laser power stability, including laser, light intensity light source, adjusting rod, three-way pipe, valve, gas cylinder, trip bolt, pedestal, photodiode, timekeeping system, light shield, support base, the first optical occluder component, the second optical occluder component, clamp nut and upper shadow shield.The present invention is with low cost, simple easy-maintaining, working stability.Because the present invention is just to start timing after laser power stability, thus using the present invention can make that the ignition delay time of solid propellant measures it is more accurate, the fluctuation of experimental data diminishes, the credible raising of experimental result.
Description
Technical field
The invention belongs to solid propellant Laser Ignition Processes, and in particular to a kind of light extraction based on after laser power stability
Time set.
Background technology
Ignition Research under the irradiation of solid propellant laser starts from eighties of last century sixties.《Laser-induced
ignition of solid propellants for gas generators》Mentioned in one text, will using beam splitter
LED is arranged close to solid propellant and can enter the position of video frames, and the initial time of Laser shock loading is by the LED in video recording
Light to record first, by the frame numbers first between luminous frame and propellant generation initial flame frame of LED in calculating video recording most
Ignition delay time is obtained eventually.The shortcoming of this method is：（1）Certainty of measurement is limited by video recording equipment frame frequency, and logical
Cross human eye and judge to obtain two frame pictures of the luminous initial times of LED and solid propellant ignition initial time that error is larger；
（2）When laser has just started light extraction power be change, the laser energy for being actually irradiated to propellant surface be not measure swash
Light energy.
China Patent No. 201410422901.X discloses a kind of signal based on the experiment of solid propellant laser ignition and adopts
Acquisition means, photodiode that will be sensitive to flame is affixed on laser pipe surface, and photodiode produces electricity after Laser output
Stream signal, triggering timing after current signal transfer to timekeeping system.This structure is still just to be opened when laser is unstable
Beginning timing, cause can experimental data fluctuation it is big, experimental result is unreliable.
The content of the invention
It is an object of the invention to provide a kind of light extraction time set based on after laser power stability, solve due to swashing
The unstable problem for causing experimental data bounce big of light device initial time rate.
The technical solution for realizing the object of the invention is：A kind of light extraction time set based on after laser power stability,
Including laser, light intensity light source, adjusting rod, three-way pipe, valve, gas cylinder, trip bolt, pedestal, photodiode, timing
System, light shield, support base, the first optical occluder component, the second optical occluder component, clamp nut and upper shadow shield；Support base bag
Support bar and first base are included, the shaft of support bar is provided with boss, and support bar bottom is fixed in first base；Pedestal includes
Cylinder and second base, its center are provided with first through hole, and cylinder is fixed in second base；Adjusting rod stretches into pedestal
Cylinder first through hole in, by be arranged on cylindrical sidewall trip bolt position；First optical occluder component includes the
One connection ring 1, the first plate body and the first connection boss, the first connection ring and the first connection boss are respectively positioned at the two of the first plate body
End；Second optical occluder component includes the second connection ring, the second plate body and the second connection boss, and the second connection ring and the second connection are convex
Platform is respectively positioned at the two ends of the second plate body；First connection ring of the first optical occluder component is arranged on the boss of the support bar of support base
Top, the second connection ring of the second optical occluder component is arranged in the top of the first connection ring on support bar, the second connection
Ring top is positioned by clamp nut；Regulation club body is provided with the second through hole, and three-way pipe is arranged in second through hole, threeway
Pipe one end is connected with valve, the other end connection gas cylinder of valve；The other two ends of three-way pipe are connected boss with first respectively
Connected with the second connection boss；Upper shadow shield is connected in the second plate body top of the second optical occluder component, and laser is located at upper screening
Tabula rasa top；Photodiode is located at the first plate body lower section of the first optical occluder component, is connected by connector and adjusting rod, light
Electric diode is located in light shield, and light shield bottom is arranged on connector, and top contacts with the first optical occluder component；Light shield
Top is provided with light intensity light source；Timekeeping system is connected with photodiode.
Also include rubber ring, three-way pipe is connected boss with first and the second connection boss junction is respectively equipped with rubber ring.
The first plate body and the second plate body are parallel to each other, and parallel with base.
Compared with prior art, its remarkable advantage is the present invention：（1）The ignition delay time of solid propellant can be made
It is more accurate：Because timekeeping system is just to allow laser to be irradiated to propellant after laser power reaches stabilization to show and start in time
, influence of the laser power fluctuation to ignition delay time is eliminated, make experimental data relatively reliable.
（2）It is with low cost.
（3）Simple structure, it is easy-maintaining：The power of laser is very high, and prolonged irradiation can more than be hidden with ablation metal
Tabula rasa needs often to change, and because upper shadow shield is fixed by screws on the first optical occluder component, dismantles very convenient.
（4）It is reliable and stable, will not limited by use condition by false triggering：There is light shield outside photodiode, on the one hand
External light source signal fluctuation false triggering timekeeping system can be avoided, such as laboratory is opened the door suddenly so that illumination becomes strong and triggers real
Check system；Even if on the other hand being worked in the case where extraneous intensity of illumination is very high, due to the presence of light shield, photodiode
Will not saturation, photoelectric current only can be just produced when system is opened, timekeeping system is just started working.
Brief description of the drawings
Fig. 1 is the light extraction time set general illustration based on after laser power stability of the invention.
Fig. 2 is the top view of the light extraction time set based on after laser power stability of the invention.
Fig. 3 is the second optical occluder component of the light extraction time set based on after laser power stability of the invention.
Fig. 4 is the optical occluder component of light extraction time set first based on after laser power stability of the invention.
Fig. 5 is the office of the gases at high pressure opening shadow shield of the light extraction time set based on after laser power stability of the invention
Portion's schematic diagram.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
With reference to Fig. 1 ~ Fig. 5, a kind of light extraction time set based on after laser power stability, including laser 1, light intensity light source
2nd, adjusting rod 3, three-way pipe 5, valve 6, gas cylinder 7, trip bolt 8, pedestal 9, photodiode 10, timekeeping system 11, screening
Light shield 12, support base 13, the first optical occluder component 14, the second optical occluder component 15, clamp nut 16 and upper shadow shield 17.Support
Seat 13 includes support bar and first base, and the shaft of support bar is provided with boss, and support bar bottom is fixed in first base, the
One base is fixed on testing stand.Pedestal 9 includes cylinder and second base, and its center is provided with first through hole, cylinder
It is fixed in second base, second base is fixed on testing stand.Cylindrical sidewall is provided with screwed hole, and trip bolt 8 is arranged on
In above-mentioned screwed hole, adjusting rod 3 is stretched into the first through hole of the cylinder of pedestal 9, is positioned by trip bolt 8.First shading
Board component 14 includes the first connection ring 14-1, the first plate body 14-2 and the first connection boss 14-3, the first connection ring 14-1 and the
One connection boss 14-3 is respectively positioned at the two ends of the first plate body 14-2.Second optical occluder component 15 include the second connection ring 15-1,
The connection boss of connection boss 15-3, the second connection ring 15-1 and second of second plate body 15-2 and second 15-3 is located at the second plate respectively
The two ends of body 15-2.First connection ring 14-1 of the first optical occluder component 14 is arranged on the boss top of the support bar of support base 13
Portion, the second connection ring 15-1 of the second optical occluder component 15 is arranged in the top of the first connection ring 14-1 on support bar,
Second connection ring 15-1 tops are positioned by clamp nut 16.The shaft of adjusting rod 3 is provided with the second through hole, and three-way pipe 5 is arranged on institute
State in the second through hole, the one end of three-way pipe 5 is connected with valve 6, the other end connection gas cylinder 7 of valve 6.Three-way pipe 5 is in addition
Two ends are connected the connection boss 15-3 connections of boss 14-3 and second with first respectively.Upper shadow shield 17 is connected in the second shadow shield group
The second plate body 15-2 tops of part 15, laser 1 is located at the top of upper shadow shield 17.Photodiode 10 is located at the first shadow shield group
The first plate body 14-2 lower sections of part 14, are connected by connector and adjusting rod 3, and photodiode 10 is located in light shield 12, is hidden
The bottom of light shield 12 is arranged on connector, and top contacts with the first optical occluder component 14.The top of light shield 12 is provided with light intensity light source
2.Timekeeping system 11 is connected with photodiode 10.
Also include rubber ring 4, three-way pipe 5 is connected the connection boss 15-3 of boss 14-3 and second junctions with first and sets respectively
There is rubber ring 4.
First plate body 14-2 and the second plate body 15-2 are parallel with testing stand.
Timekeeping system 11（It is purchased in market, Sweden SLOPE-HS4）Electric current for recording the generation of photodiode 10.
With reference to Fig. 5, propellant is arranged on the lower section of upper shadow shield 17, during using the present invention, is seen first by power meter
After examining laser stabilization, valve 6 is opened, after the gases at high pressure in gas cylinder 7 pass through three-way pipe 5, by the first optical occluder component 14
The upper shadow shield 17 being connected with the second optical occluder component 15 and with the second optical occluder component 15 blows open, and now laser 1 sends
Laser is irradiated to propellant surface, while light intensity light source 2 is irradiated on photodiode 10, photodiode 10 produces electric current letter
Number, triggering timing system 11, timekeeping system 11 starts timing.
Embodiment 1
With reference to Fig. 1 ~ Fig. 5, a kind of light extraction time set based on after laser power stability, including laser 1, light intensity light source
2nd, adjusting rod 3, three-way pipe 5, valve 6, gas cylinder 7, trip bolt 8, pedestal 9, photodiode 10, timekeeping system 11, screening
Light shield 12, support base 13, the first optical occluder component 14, the second optical occluder component 15, clamp nut 16, upper shadow shield 17.Support
Seat 13 includes support bar and first base, and the shaft of support bar is provided with boss, support bar bottom welding in first base, the
One base is bolted on testing stand.Pedestal 9 includes cylinder and second base, and its center is provided with first and leads to
Hole, cylinder is welded in second base, and second base is bolted on testing stand.Cylindrical sidewall is provided with screw thread
Hole, trip bolt 8 is arranged in above-mentioned screwed hole, and adjusting rod 3 is stretched into the first through hole of the cylinder of pedestal 9, by screwing
The secured adjusted bar 3 of trip bolt 8.First optical occluder component 14 includes integrally formed first connection ring 14-1, the first plate body 14-
2 and first connect boss 14-3, the first connection ring 14-1 and the first connection boss 14-3 respectively positioned at the two of the first plate body 14-2
End.Second optical occluder component 15 includes the second connection ring 15-1, the second plate body 15-2 and the second connection boss 15-3, the second connection
The connections of ring 15-1 and second boss 15-3 is respectively welded the two ends of the second plate body 15-2.First connection of the first optical occluder component 14
Ring 14-1 is enclosed within the boss top of the support bar of support base 13, and the second connection ring 15-1 of the second optical occluder component 15 is enclosed within and is located at
The top of the first connection ring 14-1 on support bar, the second connection ring 15-1 tops are provided with clamp nut 16, by screwing fastening
Nut 16, the first connection ring 14-1 and the second connection ring 15-1 are fixed.The shaft of adjusting rod 3 is provided with the second through hole, and three-way pipe 5 is consolidated
It is scheduled in second through hole, the one end of three-way pipe 5 is connected with valve 6, the other end connection gas cylinder 7 of valve 6.Three-way pipe 5
Other two ends the connection boss 15-3 connections of boss 14-3 and second are connected with first respectively, junction is provided with rubber ring 4.Second
Three screwed holes are provided with plate body 15-2, upper shadow shield 17 is connected in the second plate body of the second optical occluder component 15 by screw 18
In screwed hole at the top of 15-2, laser 1 is located at the top of upper shadow shield 17.Photodiode 10 is located at the first optical occluder component 14
The first plate body 14-2 lower sections, be connected by connector and adjusting rod 3, photodiode 10 is located in light shield 12, light shield
12 bottoms are fixed on connector, and top contacts with the first optical occluder component 14, but do not influence the first optical occluder component 14 to open.
The top of light shield 12 is provided with light intensity light source 2.Timekeeping system 11 is connected with photodiode 10.
Timekeeping system 11（It is purchased in market, Sweden SLOPE-HS4）Electric current for recording the generation of photodiode 10.
When light extraction time set based on after laser power stability of the present invention is not used, it is by 4W of laser power
Example, propellant is NEPE, 5 groups of NEPE propellant fires is done in nitrogen environment and postpones experiment, and experimental data is as shown in table 1.
Table 1 is not used the experimental data during present invention
| Specimen coding | 1 | 2 | 3 | 4 | 5 |
| Ignition delay time（ms） | 54.867 | 66.366 | 68.551 | 41.252 | 39.089 |
This group of average value of data is 54.025ms, and standard deviation is 13.695ms, and relative standard deviation is 25.35%.Phase
To standard deviation than larger, illustrate that data fluctuations are big, the reliability of data is low.
During using light extraction time set based on after laser power stability of the present invention, still with laser power as 4W
As a example by, propellant is NEPE, 5 groups of NEPE propellant fires is done in nitrogen environment and postpones experiment, and experimental data is as shown in table 2.
Experimental data when table 2 is using the present invention
| Specimen coding | 1 | 2 | 4 | 4 | 5 |
| Ignition delay time（ms） | 50.259 | 46.895 | 68.551 | 48.562 | 52.436 |
This group of average value of data is 50.768ms, and standard deviation is 3.432ms, and relative standard deviation is 6.76%.Relatively
Standard deviation substantially diminishes, and illustrates that data fluctuations reduce the reliability raising of data.
Using the light extraction time set based on after laser power stability of the invention, because timekeeping system is in laser power
Just allow laser to be irradiated to propellant after reaching stably to show and start timely, when eliminating laser power fluctuation to firing delay
Between influence, make experimental data relatively reliable；It is with low cost.It is simple easy-maintaining.It is reliable and stable, will not made by false triggering
Limited with condition：There is light shield outside photodiode, on the one hand can avoid external light source signal fluctuation false triggering timekeeping system,
As laboratory is opened the door suddenly so that illumination becomes strong and triggers experimental system；Even if on the other hand very high in extraneous intensity of illumination
In the case of work, due to the presence of light shield, photodiode will not saturation, light only can be just produced when system is opened
Electric current, timekeeping system is just started working.
Claims (3)
1. a kind of light extraction time set based on after laser power stability, it is characterised in that：Including laser（1）, light intensity light source
（2）, adjusting rod（3）, three-way pipe（5）, valve（6）, gas cylinder（7）, trip bolt（8）, pedestal（9）, photodiode
（10）, timekeeping system（11）, light shield（12）, support base（13）, the first optical occluder component（14）, the second optical occluder component
（15）, clamp nut（16）With upper shadow shield（17）；Support base（13）Including support bar and first base, on the shaft of support bar
Boss is provided with, support bar bottom is fixed in first base；Pedestal（9）Including cylinder and second base, its center sets
There is first through hole, cylinder is fixed in second base；Adjusting rod（3）Stretch into pedestal（9）Cylinder first through hole in, lead to
Cross the trip bolt for being arranged on cylindrical sidewall（8）Positioning；First optical occluder component（14）Including the first connection ring（14-1）,
One plate body（14-2）With the first connection boss（14-3）, the first connection ring（14-1）With the first connection boss（14-3）It is located at respectively
First plate body（14-2）Two ends；Second optical occluder component（15）Including the second connection ring（15-1）, the second plate body（15-2）With
Second connection boss（15-3）, the second connection ring（15-1）With the second connection boss（15-3）The second plate body is located at respectively（15-2）
Two ends；First optical occluder component（14）The first connection ring（14-1）The boss top of the support bar of support base 13 is arranged on,
Second optical occluder component（15）The second connection ring（15-1）It is arranged in the first connection ring on support bar（14-1）Top
Portion, the second connection ring（15-1）Top passes through clamp nut（16）Positioning；Adjusting rod（3）Shaft is provided with the second through hole, three-way pipe
（5）It is arranged in second through hole, three-way pipe（5）One end and valve（6）It is connected, valve（6）The other end connection high pressure gas
Bottle（7）；Three-way pipe（5）Other two ends be connected boss with first respectively（14-3）With the second connection boss（15-3）Connection；On
Shadow shield（17）It is connected in the second optical occluder component（15）The second plate body（15-2）Top, laser（1）Positioned at upper shadow shield
（17）Top；Photodiode（10）Positioned at the first optical occluder component（14）The first plate body（14-2）Lower section, by connector
With adjusting rod（3）It is connected, photodiode（10）Positioned at light shield（12）It is interior, light shield（12）Bottom is arranged on the connector
On, top and the first optical occluder component（14）Contact；Light shield（12）Top is provided with light intensity light source（2）；Timekeeping system（11）With
Photodiode（10）Connection.
2. the light extraction time set based on after laser power stability according to claim 1, it is characterised in that：Also include rubber
Cushion rubber（4）, three-way pipe（5）Boss is connected with first（14-3）With the second connection boss（15-3）Junction is respectively equipped with rubber ring
（4）.
3. the light extraction time set based on after laser power stability according to claim 1, it is characterised in that：Described first
Plate body（14-2）With the second plate body（15-2）It is parallel to each other, and it is parallel with base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510451923.3A CN105004751B (en) | 2015-07-28 | 2015-07-28 | A kind of light extraction time set based on after laser power stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510451923.3A CN105004751B (en) | 2015-07-28 | 2015-07-28 | A kind of light extraction time set based on after laser power stability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105004751A CN105004751A (en) | 2015-10-28 |
| CN105004751B true CN105004751B (en) | 2017-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510451923.3A Expired - Fee Related CN105004751B (en) | 2015-07-28 | 2015-07-28 | A kind of light extraction time set based on after laser power stability |
Country Status (1)
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| CN (1) | CN105004751B (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430346A (en) * | 1989-10-13 | 1995-07-04 | Ultra Performance International, Inc. | Spark plug with a ground electrode concentrically disposed to a central electrode and having precious metal on firing surfaces |
| US7789153B2 (en) * | 2006-10-26 | 2010-09-07 | Alliant Techsystems, Inc. | Methods and apparatuses for electronic time delay and systems including same |
| CN102305757B (en) * | 2011-05-20 | 2013-04-03 | 西安电子科技大学 | Device and method for measuring concentration of high-pressure combustion carbon black particles |
| CN202854077U (en) * | 2012-09-10 | 2013-04-03 | 浙江大学 | Boron particle combustion observation device for realizing ignition by high-voltage xenon lamp |
| CN102930763B (en) * | 2012-10-26 | 2014-10-08 | 山东省远大网络多媒体股份有限公司 | Photoelectric timing and ranging tester |
| CN203572347U (en) * | 2013-10-10 | 2014-04-30 | 中国航天科技集团公司川南机械厂 | Intelligent delay igniter |
| CN104181160B (en) * | 2014-08-25 | 2019-07-12 | 南京理工大学 | A kind of signal pickup assembly based on the experiment of solid propellant laser ignition |
| CN104596768B (en) * | 2015-01-13 | 2017-04-12 | 浙江大学 | Device for testing ignition combustion characteristics and propulsive performance of solid fuel micro-thruster |
| CN204882418U (en) * | 2015-07-28 | 2015-12-16 | 南京理工大学 | Light -emitting timing device based on stable back of laser power |
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2015
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