CN107328504A - A kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity - Google Patents
A kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/241—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet by photoelastic stress analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0038—Force sensors associated with force applying means applying a pushing force
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Abstract
The present invention relates to a kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity.The present invention, based on dynamic photoelasticity, light path system, the real-time change of optics stripe pattern during by determining its stress, so as to show the size and situation of change of instantaneous stress is built by core of Photoelasticity element according to the thrust feature of electric propulsion.The system includes laser, Photoelasticity element, High-speed transient image acquisition device and necessary image processing techniques, is mainly used in the transient driving force being continually changing with the time of acquisition pulse formula propulsion system generation.The system is based on stress-optic law, and the thrust for producing thruster with photoelasticity special material and high-speed photography device is visualized, and the change procedure of thrust is especially recorded, to study the change mechanism of electric propulsion thruster thrust.
Description
Technical field
The present invention relates to a kind of Micromass cell culture system, more particularly to its microthrust is measured in real time in electric propulsion field it is
System.
Background technology
At present, domestic microthrust and the high-acruracy survey of micro- momentum to electric propulsion thruster, relatively common is based on single
Pendulum, inverted pendulum, the Thrust Measuring System such as rock.Wherein, when the balance,electromagnetic based on inverted pendulum principle measures momentum, exist tight
The null offset of weight, the unstable measurement accuracy that also results in balance,electromagnetic equilbrium position is poor, therefore, and it is fixed to be typically used for
Property or semi-quantitative analysis.
Comparatively, using measurement thrust or momentum is rocked with higher accuracy and sensitiveness, the history rocked can
Trace back to the torsion balance that all one's life in 1798 is invented to measure gravity acceleration constant.With to rocking measurement apparatus
Update, its measurement range becomes more extensively, and C.Phipps et al. devises a kind of rocking for use static demarcating, come
The momentum of what measurement laser ablation microthruster was produced receive ox second-time.Although rocking measuring system has such advantage,
Its average thrust that can only be produced to thruster and momentum are measured, it is difficult to which solution is related to asking for the instantaneous thrust of thruster
Topic.
The widely used mainly piezoelectric transducer, including piezo-electric crystal, piezoelectricity of instantaneous thrust is measured at this stage
Ceramics and PVDF (polyvinylidene fluoride) piezoelectric transducer, the advantage is that can be converted to voltage by thrust to be measured, can be with
The thrust of accurate measurement change, and with many advantages, such as response is fast, sensitivity is high and simple in construction.But piezoelectric type
The operating environment requirements of sensor are harsh, are vulnerable to the influence of electromagnetic field in the electric thruster course of work, cause measurement result not
Accurate or measurement can not be normally carried out.
Dynamic photo-elasticity is a kind of basic model test method in experimental solid mechanics, utilizes optics sensitive material stress
Photoelasticity element is made in the characteristic that temporary birefrigent phenomenon can be produced afterwards, when applying continuous load, the stress hair of element each point
Different degrees of deformation can also occur for changing, corresponding striped, now, by using the bar of high speed photography recording element
Line change procedure, and then stress variation process is obtained, it counter may finally release the changing rule of thrust.Dynamic photoelasticity by
In having the advantages that intuitive and instantaneity, structure should during having been widely used for collision, impact and explosion etc.
The dynamic corresponding analysis of power.
Traditional thrust-measuring device is primarily used to measure the average thrust and momentum of thruster, and the survey of transient driving force
Amount method is relatively fewer, also deficienter always for high-precision measurement means, relatively common thrust/impulse measurement platform
Frame includes single pendulum, inverted pendulum, rocked.In research, thruster had once been carried out using the balance,electromagnetic based on inverted pendulum principle
Micro- impulse measurement, but find that balance,electromagnetic has serious null offset by measurement result.Balance,electromagnetic equilbrium position is unstable
It is fixed, cause measurement accuracy to be difficult to ensure that, can only typically be used for qualitative or semi-quantitative analysis.What current microthruster can be exported
First momentum is from sub- uNs to hundreds of μ Ns.The momentum that microthruster is produced is typically smaller, and its magnitude arrives for uNs
Between mNs.Although micro- momentum of milli ox second or ox second-time is easier measurement, however, with the reduction of micro- momentum, receiving
The accurate measurement of ox second and the micro- momentum of micro- ox second then becomes very difficult.And the momentum one that pulsed plasma thruster is produced
As be micro- ox second-time.The laser microthruster (μ LPT) for producing thrust based on laser ablation solid working medium can then be produced
The microthrust of nNs magnitudes.First momentum that the pulse plasma thruster that Chinese T EPO engineerings are used is produced is 58.4 μ Ns.
The thruster of micro- ox magnitude is used in NASA and ESA LISA engineerings.In addition, NASA ST7 tasks use 2-20 μ
N thruster, precision is within 0.1 μ N.In experimental study, so small thrust is accurately measured relatively difficult.Due to measurement
Instrument has noise with environment in itself, often floods measured signal, greatly influences measurement accuracy.Microthruster works
When, measurement stand stress produces vibration, can also influence measurement accuracy.In addition, vacuum also can be to vacuum chamber and internal survey
Amount system has a negative impact.Therefore, it is still to need what is solved in experimental study to the accurate measurement of micro thrust and momentum
Problem.
The content of the invention
The technical problem to be solved in the present invention is, the thrust being continually changing with the time produced for microthruster, rock,
The problem of traditional thrust measurement mode such as balance,electromagnetic can not measure thruster transient driving force sizes values and piezoelectric type sensing
It is vulnerable to the shortcoming of thruster electromagnetic interference in device measurement process, proposes that a kind of is that can measure thruster transient driving force energy again
Enough record the transient driving force measuring system of thruster thrust variation whole process.Dynamic photo-elasticity method is applied to by the present invention
The fields of measurement of thruster transient driving force, it is most heavy on the one hand with simple in construction, easily operated and high reliability
What is wanted is to provide method to solve the problem of traditional thrust test method is difficult to measurement transient driving force
The present invention is using pulsed plasma thruster as application background, in dynamic photo-elasticity method as main technical schemes,
Using image acquisition device (including ccd video camera and image pick-up card), pulse laser, pulsed plasma thruster and
Optical element constitutes Instantaneous digital image capturing system, and quantitative analysis and photoelastic stress analysis are carried out to bar graph using computer,
Realize and pulsed plasma thruster working thrust is measured, design a set of height suitable for pulsed plasma thruster
Precision, high-resolution transient state Micromass cell culture platform.
A kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity of the present invention, optical system master
Will be by LASER Light Source, Photoelasticity element and High-speed transient image acquisition device.Pulse laser produces optics ring as light source
Border, the duration of its pulse laser produced is 30~50ns, and it is " fast equivalent to millions of width/high-speed camera per second
The time that door " is opened, it is considered that the deflection of Photoelasticity element is zero in this time interval.It is many non-crystal
Bright material, such as glass, celluloid, phenolic resin, epoxy resin, the cruel plastics of poly- carbonic acid, under stress conditions, meeting
Present and be similar to the same birefringence effect of birefringece crystal.This effect exists with the presence of stress, and disappearing with stress
Lose and disappear, therefore referred to as temporary birefrigent effect.Birefringence effect is the physical basis of photoelastic method.The core of dynamometry embodies
On Photoelasticity element, therefore selection suitable material and size are the cores of dynamometry precision and resolution ratio.Dynamic photo-elasticity
The key of method dynamometry is the bar graph of flexible member, and the quality of bar graph directly determines the precision of dynamometry, therefore for height
For fast transient images collector, it is desirable to which it can quickly and accurately record image.
The present invention intends using dynamic photo-elasticity method according to the characteristics of pulsed plasma thruster, with Photoelasticity member
Part is that core builds light path system, by determining optical stripe image change during its stress, shows the size of its stress and divides
Cloth rule.The transient images of optical stripe, the real-time change of approximate reflection thruster are recorded using high-speed camera simultaneously.This
It is non-contact measurement to plant metering system, is also nondestructive measuring method, it is not necessary to sensing is mounted directly on works
Device or other measurement apparatus, can reduce the interference of mechanical oscillation, power cable to thrust measurement, solve to commonly use micro- push away at present
Null offset that power and micro- impulse measurement device are present, equilbrium position are unstable, demarcation is difficult and the low problem of precision.
The electric propulsion field microthrust transient measurement system based on dynamic photoelasticity of the present invention includes five parts, respectively
For：Optical environment excitation system, thruster system, control system, transient images collector and image procossing show system,
Wherein, optical environment excitation system, thruster system, transient images collector, image procossing show system all by control system
Control, overall composition is as shown in Figure 1.
The optical environment excitation system：LASER Light Source 1, collimating mirror 2, polarizer 3,1/4 slide are followed successively by from left to right
I 4, photoelasticity element 5,1/4 slide II 6, analyzer 7, condenser 8, each element central o'clock is all on an axis, each member
The distance between spec characteristic and element of part meet optical imagery rule, it is ensured that the stress image of generation is clearly accurate.Thrust
Device 11 is connected by rigid plate 10 with photoelasticity element 5, and high speed camera 9 is located at the side of condenser 8.
In addition, according to the difference of thruster thrust size, photoelasticity element 5 can be changed, to meet measurement request, one
As in the case of photoelasticity element can select that optical sensitivity is higher, there is after stress the asphalt mixtures modified by epoxy resin of temporary birefrigent effect characteristic
Fat or makrolon.Light source 1 uses white light, can be protected in order that obtaining photoelasticity element in high-speed photography imaging clearly
Light source is demonstrate,proved away from collimating mirror suitable distance.The effect of collimating mirror 2 is that the cone-shaped beam for sending light source is changed into directional light, makes light
Can be vertically into photoelasticity element.Polarizer is divided into polarizer and analyzer, wherein be polarizer 3 close to light source side,
Natural light after polarizer by obtaining linearly polarized light；It is analyzer 7 close to the side of condenser 8, it is to examine light that it, which is acted on,
The polarization state of ripple.1/4 slide I 4 effect close to light source side is that linearly polarized light is changed into circularly polarized light, close to optically focused
1/4 slide II 6 effect of the side of mirror 8 is that circularly polarized light is changed into linearly polarized light.
The species of photoelasticity element 5 is various, can select suitable according to factors such as surveyed thrust size and rate of changes
Elastooptic mateiral, it should meet, and transparency is good, have the high (fringe value of temporary birefrigent effect, optical sensitivity after stress
It is low), modulus of elasticity big and initial stress and time edge effect is small etc. requires, usually using more frequently there is epoxy resin
And polycarbonate.
Condenser 8 effect be aggregation directional light, can on high speed camera blur-free imaging.
The shooting process of high speed camera 9 is by control system control, and its film speed can reach each second 1,000,000 times, exposes
It is less than 1 microsecond between light time.
Light source 1 produces cone-shaped beam, and directional light is become by collimating mirror 2, through producing linearly polarized light after polarizer 3,
Linearly polarized light becomes circularly polarized light after 1/4 slide I 4, and circularly polarized light occurs birefringence through photoelasticity element 5 and showed
As producing interference, circularly polarized light passes through the complanation polarised light of 1/4 slide II 6 afterwards.Linearly polarized light now is relatively above
Linearly polarized light for, carry stress information, through analyzer 7 after converged by condenser 8 after, generate stressed cord figure,
It can be gathered by Instantaneous digital image capturing system.
Optical environment excitation system major function is to build an optical environment to photoelasticity element, it is ensured that bullet after stress
Property the element stressed cord figure that can tell on excellent, the relevant information of stressed cord figure is passed while passing through optical element
Deliver in image acquisition device.
Thruster system：Major function is at stress to produce thrust, and thrust being delivered on photoelasticity element
State.Thruster system includes thruster 11 and rigid plate 10, and the present invention does not consider thrust for the purpose of realizing dynamometry
26S Proteasome Structure and Function inside device, different types of thruster is changed according to the need for dynamometry.Herein, with pulsed plasma
Exemplified by thruster.
The rigid effect of version 10 is connection thruster and epoxide resin material, and the thrust that thruster is produced is delivered into photoelasticity
Material surface, adapts to different size of thrust, so that stress becomes in epoxy resin by the shape for changing rigid plate
Change.
Control system, including electromagnetic wave transmitter 13, electromagnetism trigger 14, pressure trigger 15, delayer 16 and automatically controlled
Device 17, major function is precision synchronous control LASER Light Source triggering moment, thruster loading moment and transient acquisition stress image
Moment, wherein, electromagnetic wave transmitter 13 launches electromagnetic wave to electromagnetism trigger 14,
Pressure trigger 15 is between rigid plate and flexible member, in interference fits；
Instantaneous digital image capturing system：Including mainly being realized by high speed camera.
The duration for the pulse laser that light source 1 is produced is between tens nanosecond.It is equivalent to millions of width/high speed per second
The time that camera " shutter " is opened.Think stress optic in this time interval and be deformed into invariant.In order to gather photoelasticity
Interference image of the element by a certain moment after thruster thrust, it should make LASER Light Source triggering moment, thruster loading moment
Three accurately synchronizes Synchronization Control at the time of with transient acquisition interference image, when thruster starts, equivalent to when
Between origin O.Thruster work is to be obtained by jet plasma plume using the principle of active force and reaction force
Thrust is taken, therefore thruster operation sprays plasma plume, plasma, which has, to be absorbed and decay electromagnetic wave, and
And the characteristic that can be reflected, reflect and scatter.When thruster works, the plasma plume of ejection prevents electromagnetic wave transmitter
The transmission of 13 electromagnetic waves, electromagnetism trigger 14 now produces signal PC when being triggered for the first time as the electric controller 17 of LASER Light Source 1
Between t0, so that first pulsed light produced, to be now used as the timing origin O of light source 1.It at the time of be tQ1.Pressure activated
Device 15 is in interference fits in rigid plate and flexible member, when thruster does not work, rigid plate 10 and pressure trigger 15
In contact and not in contact with critical point, by OT1 the and T1T2 periods, when thruster 11 works, thruster 11 is extruded just
Property plate 10 so that squeeze pressure trigger 15 so as to be allowed to the electric impulse signal CT that produces as second of light source 1 triggering when
Carve, be transferred again to the electric controller 17 of LASER Light Source 1, equivalent to K points on SECO figure, can be selected according to requirement of experiment
At the time of determining LASER Light Source and project pulsed light Q, △ t are to gather the time of stress image after photoelasticity element stress.This is
The time control precision of system is less than 1 μ s.
In order to control Instantaneous digital image capturing system triggering moment, by the electric impulse signal of electromagnetism trigger 14, except passing
Pass outside LASER Light Source 1, then be transmitted to delayer 16, the electric pulse electric signal for sending a delay is touched as the outer of high speed camera 9
Signal, so as to excite Instantaneous digital image capturing system to start working.
Control system control high speed camera triggering is started working, and then starts to shoot a series of fringe stress figure until pushing away
Power device is stopped.When thruster pulsed operation next time, electromagnetism trigger is triggered again and opens high speed camera work.When
When thruster 11 works, the plasma plume touched can hinder Electromagnetic Wave Propagation, and electromagnetic wave trigger 14 produces electromagnetic pulse
Signal triggers LASER Light Source electric controller, using now as the timing origin O of light source 1, by OT1And T1T2Period.Work as thrust
When the thrust of device 11 is transmitted to photoelasticity element 5, pressure trigger 15 produces pulse signal and passes to the automatically controlled of LASER Light Source 1
Device 17, equivalent to K points on SECO figure, at the time of can selecting LASER Light Source injection pulsed light Q according to requirement of experiment,
△ t are to gather the time of stress image after photoelasticity element stress.In order to gather transient images, pass through electromagnetism trigger
Electric impulse signal, in addition to passing to controller, then be transmitted to Precision delayer 16, send one delay electric pulse telecommunications
Number as high speed camera 9 external trigger signal.
Image procossing shows system：The measurement result form obtained using Instantaneous digital image capturing system is all kinds of photoelastic figures
Each point in piece, picture contains two important parameters --- and the stress direction angle of each point and fringe order, fringe order are represented
The principal stress difference of the point, but the independent component of principal stress can not directly be tried to achieve by the difference and stress direction angle, therefore it is right
The separation that the important process after photoelastic picture is exactly stress is obtained for image processing system.
Stress separation can be by creating free boundary so that occurs pure stress border in model, so as to obtain main answer
Power separating resulting.Drilling processing is carried out to photoelasticity element in the present invention, an artificial free boundary is introduced, due to freedom
Border is uniaxial stressed state in two-dimensional problems, therefore directly can judge side by the photoelastic fringe order after introduction hole
The stress intensity on boundary.After due to being drilled in sample the stress value that obtains must and drilling before value there is certain deviation, therefore
Need to calculate the stress value before perforate by the stress value after perforate by corresponding formula.The Isochromatic fringes of tapping
The directions of 2 symmetry axis determine principal direction of stress at tapping point.The numerical value of principal stress is by two point A and B points in hole
Direct stress numerical value A and B determine that the two points are positioned at the edge in hole, and direct stress size is obtained by photoelastic equal difference line series, side
To tangent with the edge of point.The size of principal stress numerical value is further obtained, thrust is drawn according to the conversion relation of stress and thrust
Size, this step can realize with MATLAB.
Each tensile stress picture to should the moment instantaneous thrust size, and control system and Instantaneous digital image capturing system are protected
High speed camera shooting is demonstrate,proved and has obtained thrust size of a certain instantaneous thrust size approximated by the time interval of setting, led to
Cross smoothly to connect a series of thrust of stress images progress processing acquisition according to the priority at moment and can approximately reflect thrust
The real-time change of thrust when device works.
The major function of the system is is calculated and handled according to stress image, extraction thrust information therein, and with
Concrete numerical value and thrust image are shown.
The advantage of the invention is that：The present invention is non-contact measurement, is also nondestructive measuring method, it is not necessary to
Sensor or other measurement apparatus are mounted directly on works, mechanical oscillation, power cable can be reduced to thrust measurement
Interference, solves that null offset, equilbrium position that conventional microthrust at present and micro- impulse measurement device be present is unstable, demarcation is tired
It is difficult to and the low problem of precision.Dynamic photo-elasticity method is applied to the fields of measurement of thruster transient driving force by the present invention, has
Simple in construction, easily operated and high reliability, it is most important that difficult to solve traditional electric propulsion thrust test method
The problem of to measure transient state microthrust provide fundamental measurement thinking, can realize high accuracy accurately measure instantaneous thrust and
Momentum.
Brief description of the drawings
Fig. 1 transient driving force measuring system composition schematic diagrams；
Fig. 2 optical environment excitation system structure composition schematic diagrams；
Fig. 3 control system architecture schematic diagrams.
Embodiment
The present invention, based on dynamic photoelasticity, is built according to the thrust feature of electric propulsion by core of Photoelasticity element
Light path system, the real-time change of optics stripe pattern during by determining its stress, so as to show size and the change of instantaneous stress
Situation.System includes laser, Photoelasticity element, High-speed transient image acquisition device and necessary image processing techniques.This
Invention is mainly used in the transient driving force being continually changing with the time of acquisition pulse formula propulsion system generation.The system be based on stress-
Optical laws, the thrust for producing thruster with photoelasticity special material and high-speed photography device is visualized, it is particularly possible to
The change procedure of thrust is recorded, is easy to study the change mechanism of electric propulsion thruster thrust.
The system includes optical environment excitation system, thruster system, control system, transient images collector and figure
As processing display system, wherein, optical environment excitation system, thruster system, transient images collector, image procossing are shown
System all by control system control,
The optical environment excitation system includes photoelasticity element, optical environment excitation system generation stressed cord figure, the stress
Bar graph is gathered by Instantaneous digital image capturing system；
The thruster system includes thruster and rigid plate, and thruster is connected by rigid plate with photoelasticity element；
Instantaneous digital image capturing system is realized by high speed camera；
When control system control LASER Light Source triggering moment, thruster loading moment and transient acquisition stress image moment this 3
Carve synchronous；
The control system, as shown in figure 3, including electromagnetic wave transmitter, electromagnetism trigger, pressure trigger, delayer and electricity
Device is controlled, pressure trigger is between rigid plate and flexible member, in interference fits；
The optical environment excitation system as shown in Fig. 2 be followed successively by LASER Light Source, collimating mirror, polarizer, 1/4 glass from left to right
Piece I, photoelasticity element, 1/4 slide II, analyzer, condenser, each element central o'clock all on an axis, each element
The distance between spec characteristic and element meet optical imagery rule, it is ensured that the stress image of generation is clearly accurate；
LASER Light Source, collimating mirror, polarizer, 1/4 slide I, photoelasticity element, 1/4 slide II, analyzer, condenser, laser
Light source produces cone-shaped beam, and directional light is become by collimating mirror, through producing linearly polarized light, linearly polarized light after polarizer
Become circularly polarized light after 1/4 slide I, circularly polarized light occurs birefringent phenomenon through photoelasticity element and produces interference, it
Circularly polarized light passes through the complanation polarised light of 1/4 slide II afterwards, and linearly polarized light now carries stress information, through inspection
After being converged after polariscope by condenser, stressed cord figure is generated, the stressed cord figure is gathered by Instantaneous digital image capturing system；
During the thruster work, the plasma plume of ejection prevents the transmission of electromagnetic wave transmitter electromagnetic wave, electromagnetism triggering
Device now produces signal PC as the electric controller triggered time first time t of LASER Light Source0, so that first pulsed light produced,
To be now used as the timing origin O of light source 1；When thruster does not work, rigid plate is in pressure trigger and contacts and do not connect
Tactile critical point, by OT1 the and T1T2 periods, when thruster works, thruster extrudes rigid plate and then squeeze pressure is touched
Hair device, so as to be allowed to the electric controller that the electric impulse signal CT produced is transferred again to LASER Light Source, is K on SECO figure
Point, at the time of selecting LASER Light Source and project pulsed light Q, △ t be to gather after photoelasticity element stress stress image when
Between；
The photoelasticity element carries out drilling processing, free boundary is created, so as to obtain separating main stresses result.
Claims (5)
1. a kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity, using Photoelasticity element as core
Build light path system, the real-time change of optics stripe pattern during by determining its stress, thus show the size of instantaneous stress with
Situation of change, it is characterised in that system includes optical environment excitation system, thruster system, control system, transient images collection
Device and image procossing show system, wherein, optical environment excitation system, thruster system, transient images collector, at image
Display system is managed all by control system control,
The optical environment excitation system includes photoelasticity element (5), and optical environment excitation system generation stressed cord figure should be answered
Power bar graph is gathered by Instantaneous digital image capturing system；
The thruster system includes thruster (11) and rigid plate (10), and thruster (11) passes through rigid plate (10) and photoelasticity
Element is connected；
Instantaneous digital image capturing system is realized by high speed camera (9)；
When control system control LASER Light Source triggering moment, thruster loading moment and transient acquisition stress image moment this 3
Carve synchronous.
2. a kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity according to claim 1,
Characterized in that, the control system, including electromagnetic wave transmitter (13), electromagnetism trigger (14), pressure trigger (15), prolong
When device (16) and electric controller (17),
The pressure trigger (15) is between rigid plate and flexible member, in interference fits.
3. a kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity according to claim 1,
Characterized in that, the optical environment excitation system be followed successively by from left to right LASER Light Source (1), collimating mirror (2), polarizer (3),
1/4 slide I (4), photoelasticity element (5), 1/4 slide II (6), analyzer (7), condenser (8), each element central point all in
On one axis, the distance between spec characteristic and element of each element meet optical imagery rule, it is ensured that the stress diagram of generation
As clear accurate；
LASER Light Source, collimating mirror, polarizer, 1/4 slide I, photoelasticity element, 1/4 slide II, analyzer, condenser, laser light
Source (1) produces cone-shaped beam, becomes directional light by collimating mirror (2), linearly polarized light, plane are produced afterwards through polarizer (3)
By becoming circularly polarized light, circularly polarized light after 1/4 slide I (4) through photoelasticity element (5) birefringent phenomenon occurs for polarised light
Interference is produced, circularly polarized light passes through 1/4 slide II (6) complanation polarised light afterwards, and linearly polarized light now is carried should
Force information, through analyzer (7) after by condenser (8) converge after, generate stressed cord figure, the stressed cord figure is by transient images
Acquisition system is gathered.
4. a kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity according to claim 1,
Characterized in that, during the thruster work, the plasma plume of ejection prevents the biography of electromagnetic wave transmitter (13) electromagnetic wave
Pass, electromagnetism trigger (14) now produces signal PC as electric controller (17) triggered time first time t of LASER Light Source (1)0, from
And first pulsed light produced, to be now used as the timing origin O of light source 1；When thruster does not work, rigid plate (10) with
Pressure trigger (15) be in contact and not in contact with critical point, by OT1 the and T1T2 periods, when thruster works, push away
Power device extrudes rigid plate and then squeeze pressure trigger is transferred again to LASER Light Source so as to be allowed to the electric impulse signal CT produced
Electric controller (17), on SECO figure be K points, select LASER Light Source project pulsed light Q at the time of, △ t are photoelasticity
The time of stress image is gathered after element stress.
5. a kind of electric propulsion field microthrust transient measurement system based on dynamic photoelasticity according to claim 1,
Characterized in that, the photoelasticity element (5) carries out drilling processing, free boundary is created, so as to obtain separating main stresses result.
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