CN107655858A - Measuring system and measuring method - Google Patents
Measuring system and measuring method Download PDFInfo
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- CN107655858A CN107655858A CN201711097070.3A CN201711097070A CN107655858A CN 107655858 A CN107655858 A CN 107655858A CN 201711097070 A CN201711097070 A CN 201711097070A CN 107655858 A CN107655858 A CN 107655858A
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- curable glue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
The present invention provides a kind of measuring system, is related to fields of measurement.The measuring system includes：Optical signal transmitting unit, processing unit and compression generating unit.Optical signal transmitting unit includes：Optical signal cell and conduction optical fiber, optical signal cell are connected by conducting optical fiber and photo-curable gemel connection, processing unit with optical signal cell, and compression generating unit is connected with processing unit.Processing unit, for producing control signal, control signal is transmitted to compression generating unit, control signal is used for proof stress generating unit and applies stress to photo-curable glue.Optical signal cell, for producing initial optical signal, initial optical signal is transmitted to photo-curable glue by conducting optical fiber, and the interference light signal that photo-curable glue reflects under different stress is transmitted to processing unit.Processing unit, it is additionally operable to handle interference light signal, obtains the elasto-optical coefficient of photo-curable glue, the measuring system optical path adjusting is simple.The present invention also provides a kind of measuring method, can simplify optical path adjusting.
Description
Technical field
The present invention relates to fields of measurement, more particularly to a kind of measuring system and a kind of measuring method.
Background technology
Photo-curable glue is widely used in every profession and trade, when photo-curable glue is used as optical medium, extraneous stress
Influence to the refractive index of photo-curable glue, i.e. elasto-optical coefficient, it is the property for the photo-curable glue that needs are considered important.To light
The measurement of the elasto-optical coefficient of chemosetting glue is particularly important.
The elasto-optical coefficient measuring system of existing photo-curable glue is in space by illumination directive prism, this measuring system
The requirement of locus and angle to incident light is strict, the problem of generally existing optical path adjusting complexity.
The content of the invention
The present invention provides a kind of measuring system, for measuring the elasto-optical coefficient of photo-curable glue, can solve existing measurement
System it is strict to the locus of incident light and the requirement of angle, the problem of optical path adjusting complexity.
The measuring system includes：Optical signal transmitting unit, processing unit and compression generating unit；
The optical signal transmitting unit includes：Optical signal cell and conduction optical fiber, the optical signal cell is by conducting light
It is fine that the processing unit is connected with the optical signal cell with the photo-curable gemel connection, the compression generating unit and
The processing unit connection；
The processing unit, for producing control signal, the control signal is transmitted to the compression generating unit,
The control signal is used to control the compression generating unit to apply default stable state compression group to the photo-curable glue；
The optical signal cell, for producing initial optical signal, the initial optical signal is passed by the conduction optical fiber
The photo-curable glue is transported to, and the interference light signal that the photo-curable glue is reflected under different stable state action of compressive stress passes
Transport to the processing unit；
The processing unit, the interference light signal that processing is obtained by the optical signal cell is additionally operable to, to obtain the light
Elasto-optical coefficient of the chemosetting glue under different stable state action of compressive stress.
The measuring system, due to initial optical signal is transferred into photo-curable glue by conducting optical fiber, therefore to incident light
The requirement of locus and angle is low, and optical path adjusting is simple.
The present invention also provides a kind of measuring method, and the elasto-optical coefficient of photo-curable glue is obtained using measuring system measurement, can
To solve the problem of the strict to the locus of incident light and the requirement of angle of existing measuring method, optical path adjusting complexity.
Wherein described measuring system includes：Optical signal transmitting unit, processing unit and compression generating unit, the light letter
Number transmission unit includes optical signal cell and conduction optical fiber, and the measuring method includes：
The processing unit produces control signal, and the control signal is transmitted to the compression generating unit；
The compression generating unit applies default stable state pressure in response to the control signal to the photo-curable glue
Stress group；
The optical signal cell, produce initial optical signal, by it is described conduction optical fiber by the initial optical signal transmit to
The photo-curable glue, the interference light signal that the photo-curable glue reflects under different stable state action of compressive stress is obtained, and passed
It is defeated by the processing unit；
The processing unit, the interference light signal of optical signal cell transmission is handled, obtains the light
Elasto-optical coefficient of the chemosetting glue under different stable state action of compressive stress, and the elasto-optical coefficient is transferred to the storage element.
The measuring method, due to initial optical signal is transferred into photo-curable glue by conducting optical fiber, therefore to incident light
The requirement of locus and angle is low, and optical path adjusting is simple.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those skilled in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation for the measuring system that first embodiment of the invention provides；
Fig. 2 is that reflection of the initial optical signal in photo-curable Jiao Chu is shown in the measuring system that first embodiment of the invention provides
It is intended to；
Fig. 3 is the structural representation for the measuring system that second embodiment of the invention provides；
Fig. 4 is the flow chart for the measuring method that third embodiment of the invention provides；
Fig. 5 is the flow chart for the measuring method that fourth embodiment of the invention provides.
Embodiment
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
The accompanying drawing that embodiment provides, technical scheme provided in an embodiment of the present invention is clearly and completely described, it is clear that described
Embodiment be only part of the embodiment of the present invention, and not all embodiments.Based on embodiment provided by the invention, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
As shown in figure 1, Fig. 1 is the structural representation for the measuring system that first embodiment of the invention provides, the measuring system
For measuring the elasto-optical coefficient of photo-curable glue, the measuring system includes：Optical signal transmitting unit 110, processing unit 120 and pressure
Stress generating unit 130.
Optical signal transmitting unit 110 includes：Optical signal cell 111 and conduction optical fiber 112, optical signal cell 111 pass through biography
Guiding fiber 112 is connected with photo-curable glue 140, and processing unit 120 is connected with optical signal cell 111, compression generating unit 130
It is connected with processing unit 120.
Processing unit 120, for producing control signal, control signal is transmitted to compression generating unit 130, the control
Signal is used to control compression generating unit 130 to apply photo-curable glue 140 default stable state compression group.
Optical signal cell 111, for producing initial optical signal, initial optical signal is transmitted to light by conducting optical fiber 112
Chemosetting glue 140, and the interference light signal that photo-curable glue 140 reflects under different stable state action of compressive stress is transmitted to processing
Unit 120.
Processing unit 120, the interference light signal that processing is obtained by optical signal cell 111 is additionally operable to, to obtain photo-curable
Elasto-optical coefficient of the glue 140 under different stable state action of compressive stress.
It should be noted that as shown in Fig. 2 Fig. 2 is that initial light is believed in the measuring system that first embodiment of the invention provides
Number photo-curable Jiao Chu reflection schematic diagram, initial optical signal transmitted to photo-curable glue 140 by conducting optical fiber 112,
Initial optical signal is reflected by the first reflecting surface I of photo-curable glue and the second reflecting surface II respectively, forms the first reflected light signal
With the second reflected light signal, the wavelength of first reflected light signal and the second reflected light signal is identical, but phase is different, and first is anti-
Penetrate after optical signal is superimposed with the second reflected light signal, mutually strengthen in some phases, cancelled out each other in some phases, occurred
Interference effect, therefore the reflection of photo-curable glue 140 is interference light signal.
The measuring system that the present embodiment provides, due to initial optical signal is transferred into photo-curable glue by conducting optical fiber,
Therefore the requirement of the locus and angle to incident light is low, optical path adjusting is simple.
As shown in figure 3, Fig. 3 is the structural representation for the measuring system that second embodiment of the invention provides, for measuring light
The elasto-optical coefficient of chemosetting glue, unlike the measuring system shown in Fig. 1, in the present embodiment：
Further, optical signal cell 111 includes light source cell 113 and fiber coupler 114.
Fiber coupler includes first interface, second interface and the 3rd interface.
Light source cell 113 is connected by first interface with fiber coupler device 114.
Fiber coupler 114 is connected by second interface with conducting one end of optical fiber 112.
Photo-curable glue 140 is solidificated in the other end of conduction optical fiber 112.
Processing unit 120 is connected by the 3rd interface with fiber coupler 114.
Light source cell 113, for producing initial optical signal and initial optical signal being transferred into optical fiber coupling by first interface
Clutch 114.
Fiber coupler 114, for the initial optical signal that will be obtained by first interface, conduction is transferred to by second interface
Optical fiber 112.
Optical fiber 112 is conducted, for the initial optical signal obtained by second interface to be transmitted to photo-curable glue 140, and will
The interference light signal that photo-curable glue 140 reflects under different stable state action of compressive stress is transmitted to fiber coupling by second interface
Device 114.
Fiber coupler 114, the interference light signal that will be obtained by second interface is additionally operable to, is transmitted by the 3rd interface to place
Manage unit 120.
Optionally, fiber coupler 114 is tree-like fiber coupler, star-like fiber coupler or optical fiber circulator.
Optionally, single mode of the optical fiber 112 for the single-mode fiber of full-internal reflection type, multimode fibre or photon crystal structure is conducted
One kind in optical fiber, multimode fibre or hollow-core fiber, plastic optical fiber.
In use, it is using optical fiber cutting knife that an ends cutting for conducting optical fiber 112 is smooth, photo-curable glue 140 is attached
On the end face, then the 140 sufficiently long time of photo-curable glue is irradiated using photo-curable adhesive curing light source, so that optics
Solidification glue 140 is solidificated on the end face of conduction optical fiber 112.
Further, as shown in figure 3, processing unit 120 includes spectra collection unit 121 and Operations Analysis 122.
Spectra collection unit 121 includes data output interface.
Operations Analysis 122 include signal output interface.
Spectra collection unit 121 is connected by the 3rd interface with fiber coupler 114.
Spectra collection unit 121 is connected by data output interface with Operations Analysis 122.
Operations Analysis 122 are connected by signal output interface with compression generating unit 130.
Operations Analysis 122, for producing control signal, and by signal output interface by the control signal transmit to
Compression generating unit 130, so that compression generating unit 130 applies default size variation scope, pre- to photo-curable glue 140
If change step and the stable state compression group of default constant pressure retention time.
Fiber coupler 114, be additionally operable to by the 3rd interface, will in the presence of different stable state compression photo-curable glue
The interference light signal of 140 reflections is transmitted to spectra collection unit 121.
Spectra collection unit 121, for the interference light signal obtained by the 3rd interface to be converted into Operations Analysis 122
Accessible interference spectrum, and transmitted the interference spectrum to Operations Analysis 122 by data output interface.
Operations Analysis 122, it is additionally operable to according to the interference spectrum obtained by Data Input Interface and is stored in computing control
Default data and operation relation in unit 122 processed, calculate photo-curable glue 140 elasto-optical coefficient.
The minimum value of the scope is zero in the size variation scope of stable state compression group, and maximum is no more than photo-curable glue
140 yield limit.
More preferably, the maximum is no more than the proportional limit of photo-curable glue 140, remains the relation of stress and strain
Linear relationship, to simplify the calculating of the elasto-optical coefficient of photo-curable glue 140.
It should be noted that the stable state compression group in the range of default size variation, is walked with the default change of identical
The long and default constant pressure retention time applies stable state compression group to photo-curable glue 140.In the presence of the stable state compression group,
Photo-curable glue can not only produce the first strain on the direction parallel with the stable state compression group, can also be answered with stable state pressure
The second strain is produced on the vertical direction of power group, the ratio of first strain and second strain is photo-curable glue 140
Poisson's ratio.Second strain can cause the area of photo-curable glue 140 to change, therefore in order that the change of stable state compression group
Step-length keeps constant, and Operations Analysis 122 control compression generating unit 130 to apply stable state compression to photo-curable glue
When, it is also necessary to control pressure of the compression generating unit 130 according to the modulus of elasticity of photo-curable glue 140 and Poisson's ratio to application
Size is modified, so that the change step of stable state compression group keeps constant.
Further, as shown in figure 3, Operations Analysis 122 include arithmetic element 123 and storage element 124.
Spectra collection unit 121 is connected by data output interface with arithmetic element 123.
Storage element 124 is connected with arithmetic element 123.
Arithmetic element 123 is connected by signal output interface with compression generating unit 130.
Storage element 124, for storativity data, operation relation and the interference light obtained by data output interface
Spectrum.
Arithmetic element 123, for producing control signal, and by signal output interface, the control signal is transmitted to pressure
Stress generating unit 130, so that compression generating unit applies default magnitude range to photo-curable glue 140 and presets change step
With the stable state compression group of default constant pressure retention time.
Arithmetic element 123, usage factor data and operation relation are additionally operable to the interference spectrum that is stored in memory cell 124
Handled, obtain the wavelength under each stable state compression at the default interference minimum of interference spectrum and different stable states pressure is answered
The elasto-optical coefficient of the lower photo-curable glue 140 of power effect.
Arithmetic element 123, it is additionally operable to that wavelength at obtained default interference minimum will be handled and different stable states pressure should
The elasto-optical coefficient of the lower photo-curable glue 140 of power effect, which is transmitted into storage element 124, to be stored.
Optionally, storage element 124 also includes data reading interface and result output interface, and the data read in interface, use
In reading in coefficient data from the external world, the coefficient data includes size variation scope, change step and the constant pressure of stable state compression group
Retention time, modulus of elasticity, Poisson's ratio, initial refractive rate and the original thickness of photo-curable glue 140.The result output interface is used
Externally exported in by the elasto-optical coefficient obtained by arithmetic element 123.
Optionally, Operations Analysis 122 also include display screen, and display screen is connected with arithmetic element 123, storage element
124 transmit the result of calculation of elasto-optical coefficient the bullet light that will be obtained to arithmetic element 123, arithmetic element 123 by storage element 124
The result of calculation of coefficient is converted to the recognizable display signal of the display screen, and the display signal is transmitted to the display screen, shows
The result of calculation of elasto-optical coefficient is visualized output by display screen according to the display signal obtained by arithmetic element 123.
Further, light source cell 113 is wideband light source unit, for producing the initial optical signal of multiple different wave lengths,
The measuring system for providing the present embodiment can measure photo-curable glue 140 simultaneously in the presence of different stable state compression and not
With the elasto-optical coefficient at the wavelength of initial optical signal.
The measuring system that the present embodiment provides, in a first aspect, due to initial optical signal is transferred into light by conducting optical fiber
Chemosetting glue, therefore the requirement of the locus and angle to incident light is low, optical path adjusting is simple.Second aspect, due to fortune
Control unit is calculated, stable state compression group caused by control compression generating unit, protects the change step of the stable state compression group
Hold calculating that is constant, therefore simplifying elasto-optical coefficient.The third aspect, because light source cell is wideband light source unit, bag can be produced
The initial optical signal of multiple different wave lengths is included, therefore this measuring system can be made to measure photo-curable glue simultaneously and answered in different stable states pressure
Elasto-optical coefficient in the presence of power and at the wavelength of different initial optical signals.
As shown in figure 4, Fig. 4 is the flow chart for the measuring method that third embodiment of the invention provides, the measuring method utilizes
Measuring system measurement obtains the elasto-optical coefficient of photo-curable glue, and wherein measuring system includes：Optical signal transmitting unit, processing unit
With compression generating unit.The optical signal transmitting unit includes：Optical signal cell and conduction optical fiber.The measuring method includes following
Step：
S301, the processing unit produce control signal, and the control signal are transmitted to the compression generating unit.
S302, the compression generating unit apply default stable state pressure in response to the control signal to the photo-curable glue
Stress group.
S303, the optical signal cell produce initial optical signal, are transmitted the initial optical signal to this by the conduction optical fiber
Photo-curable glue, the interference light signal that the photo-curable glue reflects under different stable state action of compressive stress is obtained, and be transferred to this
Processing unit.
S304, the processing unit are handled the interference light signal that the optical signal cell transmits, and are obtained the optics and are consolidated
Change elasto-optical coefficient of the glue under different stable state action of compressive stress, and the elasto-optical coefficient is transferred to the storage element.
The measuring method that the present embodiment provides, due to initial optical signal is transferred into photo-curable glue by conducting optical fiber,
Therefore the requirement of the locus and angle to incident light is low, optical path adjusting is simple.
As shown in figure 5, Fig. 5 is the flow chart for the measuring method that fourth embodiment of the invention provides, the measuring method application
In a kind of measuring system, for measuring the elasto-optical coefficient of photo-curable glue, the measuring system and the measurement of 3rd embodiment offer
Unlike the measuring system of method application, in the present embodiment：
Further, the processing unit includes Operations Analysis, then the measuring method mainly includes the following steps that：
S401, the Operations Analysis produce control according to the modulus of elasticity and Poisson's ratio of the default photo-curable glue
Signal, and the control signal is transmitted to the compression generating unit.
S402, the compression generating unit apply default value scope in response to the control signal to the photo-curable glue
With the stable state compression group of default change step, the minimum value of the wherein number range is zero, and maximum is consolidated no more than the optics
Change the yield limit of glue.
The maximum of the number range is no more than the yield limit of photo-curable glue, to ensure that photo-curable glue is steady not at this
Plastic deformation is produced in the presence of state compression group.
It should be noted that stable state compression group includes multiple different size of stable state compression, these stable states pressure should
Power is referred to as stable state compression, and ascending order arranges these stable state compression by size, the difference of size between each adjacent stable state compression
Value is default change step.
In order to improve the accuracy of measurement, the compression generating unit applies a stable state compression to photo-curable glue
Afterwards, it is necessary to which the stable state compression is kept into a period of time, then change the size of the stable state compression, the time is to keep constant pressure
Time.
For measuring system, the change of the size of stable state compression is referred to as encouraging, then the measuring system is under the excitation
Response is produced, the response includes steady-state response and transient response, and the wherein intensity of transient response constantly reduces with the time.Utilizing
When the measuring system measures the elasto-optical coefficient of photo-curable glue, transient response can make measurement produce error, therefore need to keep constant pressure
For a period of time, reduce the intensity of transient response, to reduce influence of the transient response to measurement result, improve the standard of measurement result
True property, and the time of holding constant pressure is longer, measurement result is more accurate.
S403, the optical signal cell produce initial optical signal, are transmitted the initial optical signal to this by the conduction optical fiber
Photo-curable glue, the interference light signal that the photo-curable glue reflects under different stable state action of compressive stress is obtained, and be transferred to this
Processing unit.
The optical signal cell includes：Light source cell and fiber coupler.
Then, step S403 is specifically included：
The light source cell produces initial optical signal, and the initial optical signal is transmitted to the fiber coupler.
The initial optical signal that the fiber coupler transmits the light source cell is transmitted to the conduction optical fiber.
The initial optical signal that the conduction optical fiber transmits the fiber coupler is transmitted to the photo-curable glue, obtains the light
The interference light signal that chemosetting glue reflects in the presence of the stable state compression group, and the interference light signal is transferred to the optical fiber
Coupler.
The interference light signal that the fiber coupler transmits the conduction optical fiber, is transmitted to the processing unit.
S404, the processing unit are handled the interference light signal that the optical signal cell transmits, and are obtained the optics and are consolidated
Change elasto-optical coefficient of the glue under different stable state action of compressive stress, and the elasto-optical coefficient is transferred to the storage element.
The processing unit also includes：Spectra collection unit.
The Operations Analysis include：Arithmetic element and storage element.
Then step S404 implementation process is as follows：
The spectra collection unit is handled the interference light signal that the fiber coupler transmits, and obtains the arithmetic element
Manageable interference spectrum, and the interference spectrum is transmitted to the storage element.
Specifically, the interference light signal that the spectra collection unit transmits the fiber coupler, is converted into frequency domain continuous
Interference spectrum, the continuous interference spectrum abscissa is wavelength, and ordinate is power spectral density.Then according to default sampling
Wavelength interval samples to the continuous interference spectrum, obtains interference spectrum discrete in frequency domain, the discrete interference spectrum
For power spectral density vector, power spectral density vector is the manageable interference spectrum of arithmetic element.The spectra collection list
Member transmits the power spectral density vector to storage element.
The storage element also stores the sampling wavelength interval of the spectra collection unit.
The interference spectrum that the storage element transmits the spectra collection unit, is transmitted to the arithmetic element.
The arithmetic element carries out peak-seeking scanning to the interference spectrum obtained by the storage element, and obtaining should in each stable state pressure
The wavelength at minimum is preset under power, and this is preset into wavelength transmission at minimum to storage element.
Specifically, the implementation process of peak-seeking scanning is, arithmetic element is within a preset range to storage element transmission
Power spectral density vector carries out minimum value search, obtains the power spectral density of minimum, and read the minimum power spectral density pair
The vectorial sequence number answered, and the minimum work(is obtained according to the vectorial sequence number and the sampling wavelength interval being stored in the storage element
Wavelength corresponding to rate spectrum density, the minimum power spectral density are the default minimum, corresponding to the minimum power spectrum density
Wavelength, it is the wavelength at the default minimum.Therefore the effect of a stable state compression can be obtained by the scanning of single peak-seeking
Under, the wavelength at the default minimum.
When the stable state compression that photo-curable glue is subject to changes, the interference light signal of photo-curable glue reflection occurs
Change, then the power spectral density vector that the spectra collection unit obtains also changes, and the sequence number of power spectral density vector is same
Shi Zeng great reduces identical numerical value simultaneously, but the size of power spectral density does not change, i.e. power spectral density vector hair
Raw drift, the knots modification of the sequence number are referred to as drift value.Vectorial sequence number changes corresponding to the minimum power spectral density, i.e., should
Wavelength at default minimum changes.Therefore in the presence of can obtaining each stable state compression by the scanning of real-time peak-seeking, should
Wavelength at default minimum.
Arithmetic element the wavelength at the default minimum, is transmitted in the presence of each stable state compression single to storage
Member, the wavelength that the storage element presets this at minimum store in order in vector form, and this sequentially should with stable state pressure
In power group stable state compression put in order it is identical.
The storage element, also stores coefficient data, and the coefficient data includes：The size variation model of the stable state compression group
Enclose, change step and keep constant pressure time and the photo-curable glue modulus of elasticity, Poisson's ratio, original thickness and original folding
Rate is penetrated, also stores the recurrence formula of the elasto-optical coefficient of calculating optical solidification glue, the storage element is by the coefficient data, the recursion
The wavelength transmission of formula and the default minimum obtained by the arithmetic element is to arithmetic element.
Specifically, the calculating of the elasto-optical coefficient for convenience of photo-curable glue, the change step of stable state compression group is constant,
The size of each stable state compression is stored in the storage element in vector form in stable state compression group.
Optionally, the storage element includes coefficient data output interface, and coefficient data can be obtained from outside, and can be to storage
Coefficient data modify.
The arithmetic element presets the wavelength of minimum, and root according to the coefficient data obtained by the storage element with this
According to the recurrence formula obtained by the storage element：
Computing is obtained under each stable state compression, the elasto-optical coefficient of the photo-curable glue, T (σ in formula (1)N) it is in size
For σNThe stable state compression in the presence of the photo-curable glue elasto-optical coefficient, m is positive integer, σNFor in the stable state compression
The size of n-th stable state compression, σ in groupN-1For the size of the N-1 stable state compression in the stable state compression group, λ
(σN-1) be in size be σN-1The stable state compression in the presence of wavelength at the default minimum, Δ λ (σN) it is in size
For σNThe stable state compression in the presence of wavelength at the default minimum variable quantity, L (σN-1) be in size be σN-1's
The thickness of the photo-curable glue in the presence of the stable state compression, Δ L (σN) be in size be σNThe stable state compression effect
The variable quantity of the thickness of the lower photo-curable glue, n (σN-1) be in size be σN-1The stable state compression in the presence of the optics
The refractive index of solidification glue, Δ σ are the default change step.
Wherein, σN-1With σNRelation be：σN=σN-1+Δσ。
M is constant, and the coefficient data also includes m size.
It should be noted that photo-curable glue and conduction optical fiber form optical fibre Fabry-perot interferometer, for the interference
Instrument, interfere minimum at wavelength, i.e., minimum power spectral density corresponding to wavelength, expression formula be：
In formula (2), λ (σN) in size it is σNThe stable state compression in the presence of, the wavelength at the interference minimum, n
(σN) in size it is σNThe stable state compression in the presence of photo-curable glue refractive index, L (σN) be in size be σNThis is steady
The thickness of photo-curable glue in the presence of state compression.
Formula (2) is subjected to difference：
Calculated to simplify, make to preset the value that change step Δ σ is very little in stable state compression group, make stable state compression big
Small change makes the variable quantity of amounts of thickness variation and refractive index caused by photo-curable glue be the value of very little, and then makes formula (3)
InThe small influence to result of calculation of value of item can be neglected, and Δ σ is smaller, and this is to result of calculation
Influence smaller, measurement result is more accurate.But Δ σ can not be too small, when Δ σ is too small, the variable quantity of the wavelength at minimum is preset
Δλ(σN) it is less than the minimum sampling wavelength interval of spectra collection unit, the spectra collection unit can not sense default minimum
The change of the wavelength at place, measurement is caused to produce error.
In order that spectra collection unit can obtain the change information of the wavelength at default minimum completely, it is fixed according to sampling
Reason, Δ σ should make the minimum value of the variable quantity of the wavelength at default minimum be more than the sampling wavelength interval of the spectra collection unit
Twice.
Ignore in formula (3)Obtained after：
Δ n (σ can be obtained by formula (4)N) calculation formula：
The right and left of equal sign in formula (5) is preset to change step Δ σ simultaneously divided by stable state compression group, you can obtain
The recurrence formula (1) of elasto-optical coefficient.
L(σN-1) and Δ L (σN) can be calculated according to the original length and modulus of elasticity of photo-curable glue.
Specifically, for purposes of illustration only, below using the relation of stress and strain linearly to illustrate, not to photo-curable
The relation of the stress and strain of glue is defined, according to the characteristic of photo-curable glue and the size of suffered stress, stress and strain
Relation can also be non-linear relation.
The relation of stress and strain is：
ξ (σ in formula (6)N-1) be in size be σN-1The stable state compression in the presence of should caused by the photo-curable glue
Become, E is the modulus of elasticity of the photo-curable glue.
Had according to the definition of strain：
Formula (6) is brought into formula (7), had：
L (σ can be calculated to obtain according to formula (8)N-1), in formula (8), L is the original thickness of photo-curable glue, i.e. photo-curable
Glue is not affected by thickness during stable state action of compressive stress.
ΔL(σN-1) calculation formula be：
ΔL(σN-1)=L (σN)-L(σN-1) (9)
L (σ in formula (9)N) can be calculated according to formula (8).
n(σN-1) can be according to recurrence formula (1) and primary condition：The initial refractive rate n of photo-curable glue, iteration obtain.
Further, the light source cell is wideband light source unit, for producing the initial optical signal of multiple different wave lengths.
Then, in obtaining presetting the wavelength at minimum under each stable state compression, the wavelength at the default minimum
Including multigroup wavelength preset under each stable state compression at minimum.
It should be noted that photo-curable glue has the first reflecting surface and the second reflecting surface, initial optical signal by this
One reflective surface obtains the first reflected light signal, and initial optical signal obtains the second reflected light by second reflective surface to be believed
Number, first reflected light signal is identical with the wavelength of second reflected light signal, and phase is different, the first reflected light signal and second
Reflected light signal interferes, and forms interference light signal.The initial optical signal of multiple different wave lengths reflects by photo-curable glue
Afterwards, the phase difference of caused first reflected light signal and the second reflected light signal is different, obtains multigroup different interference light signal,
The corresponding one group of interference light signal of initial optical signal of each wavelength.
Multigroup different interference light signal is transmitted to spectra collection unit, respectively by every group of continuous interference light signal
Switch to interference spectrum discrete on frequency domain, and every group of interference spectrum is transmitted to storage list in vector form in order respectively
Member, storage element store these vectors with a matrix type, the corresponding one group of vector of initial optical signal of each wavelength.
The storage element is carried out the Transfer-matrix to arithmetic element, the arithmetic element by the vectorial direction to the matrix
Peak-seeking scans, and searches sequence number corresponding to the minimum value in each vector, and according to corresponding to the sequence number obtains each minimum value
Wavelength, these wavelength are the wavelength at multiple minimums in the presence of a stable state compression.
When the size of stable state compression changes, these vectors are drifted about, and real-time peak-seeking is carried out to these vectors
Scanning can obtain multigroup wavelength preset under each stable state compression at minimum.The initial optical signal pair of each wavelength
Answer one group of wavelength preset under each stable state compression at minimum.
The arithmetic element, according to the coefficient data obtained by the storage element and the wavelength of the default minimum, and
Recurrence formula (1) computing according to being obtained by the storage element is obtained under each stable state compression, the bullet light of the photo-curable glue
In coefficient,
The arithmetic element, according to the coefficient data and the ripple of multigroup default minimum obtained by the storage element
It is long, and the initial optical signal of different wave length, Mei Gewen are obtained according to recurrence formula (1) computing obtained by the storage element
Under state compression, the elasto-optical coefficient of the photo-curable glue.
The measuring method that the present embodiment provides, in a first aspect, due to being transmitted initial optical signal to light by conducting optical fiber
Chemosetting glue, therefore the requirement of the locus and angle to incident light is low, optical path adjusting is simple.Second aspect, operation control list
Member, stable state compression group caused by control compression generating unit, the change step of the stable state compression group is set to keep constant, therefore
Simplify the calculating of elasto-optical coefficient.The third aspect, at the same obtain photo-curable glue in the presence of different stable state compression and
Elasto-optical coefficient at the wavelength of different initial optical signals, therefore measurement efficiency is high.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or system including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or system also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or system including the key element.
It will be appreciated by those skilled in the art that realize that all or part of step of above-described embodiment can be by hardware come complete
Into by program the hardware of correlation can also being instructed to complete, described program can be stored in a kind of computer-readable storage
In medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as being the technical spirit pair according to the present invention without departing from technical solution of the present invention content
Any simple modification, equivalent change and modification that above example is made, in the range of still falling within technical solution of the present invention.
Claims (10)
1. a kind of measuring system, for measuring the elasto-optical coefficient of photo-curable glue, it is characterised in that the measuring system includes：
Optical signal transmitting unit, processing unit and compression generating unit；
The optical signal transmitting unit includes：Optical signal cell and conduction optical fiber, the optical signal cell by conduct optical fiber with
The photo-curable gemel connection, the processing unit are connected with the optical signal cell, the compression generating unit with it is described
Processing unit connects；
The processing unit, for producing control signal, the control signal is transmitted to the compression generating unit, it is described
Control signal is used to control the compression generating unit to apply default stable state compression group to the photo-curable glue；
The optical signal cell, for producing initial optical signal, by the initial optical signal by it is described conduction optical fiber transmit to
The photo-curable glue, and by the interference light signal that the photo-curable glue reflects under different stable state action of compressive stress transmit to
The processing unit；
The processing unit, the interference light signal that processing is obtained by the optical signal cell is additionally operable to, is consolidated with obtaining the optics
Change elasto-optical coefficient of the glue under different stable state action of compressive stress.
2. measuring system as claimed in claim 1, it is characterised in that the optical signal cell includes：
Light source cell and fiber coupler；
The fiber coupler includes：First interface, second interface and the 3rd interface；
The light source cell is connected by the first interface with the fiber coupler；
The fiber coupler is connected by the second interface with one end of the conduction optical fiber；
The other end of the photo-curable adhesive curing in the conduction optical fiber；
The processing unit is connected by the 3rd interface with the fiber coupler；
The light source cell, for producing initial optical signal and the initial optical signal being transferred into institute by the first interface
State fiber coupler；
The fiber coupler, for the initial optical signal that will be obtained by the first interface, transmitted by the second interface
To conduction optical fiber；
The conduction optical fiber, for the initial optical signal obtained by the second interface to be transmitted to the photo-curable glue, and
By the interference light signal that the photo-curable glue reflects under different stable state action of compressive stress by the second interface transmit to
The fiber coupler；
The fiber coupler, the interference light signal that will be obtained by the second interface is additionally operable to, is passed by the 3rd interface
Transport to the processing unit.
3. measuring system as claimed in claim 2, it is characterised in that the processing unit includes：Spectra collection unit and computing
Control unit；
The spectra collection unit includes data output interface；
The Operations Analysis include signal output interface；
The spectra collection unit is connected by the 3rd interface with the fiber coupler；
The spectra collection unit is connected by the data output interface with the Operations Analysis；
The Operations Analysis are connected by the signal output interface with the compression generating unit；
The Operations Analysis, the control is believed for producing the control signal, and by the signal output interface
Number transmit to the compression generating unit, so that the compression generating unit applies default size to the photo-curable glue
Excursion, default change step and the stable state compression group of default constant pressure retention time；
The fiber coupler, it is additionally operable to by the 3rd interface, will be described in the presence of the different stable state compression
The interference light signal of photo-curable glue reflection is transmitted to the spectra collection unit；
The spectra collection unit, for the interference light signal obtained by the 3rd interface to be converted into the operation control list
The accessible interference spectrum of member, and transmitted the interference spectrum to the operation control list by the Data Input Interface
Member；
The Operations Analysis, it is additionally operable to according to the interference spectrum obtained by the data-interface and is stored in the fortune
Calculate control unit in default data and operation relation, calculate the photo-curable glue elasto-optical coefficient；
The minimum value of scope is zero described in the size variation scope of the stable state compression, and maximum is consolidated no more than the optics
Change the yield limit of glue.
4. measuring system as claimed in claim 3, it is characterised in that the Operations Analysis include：Arithmetic element and storage
Memory cell；
The spectra collection unit is connected by the data output interface with the storage element；
The storage element is connected with the arithmetic element；
The arithmetic element is connected by the signal output interface with the compression generating unit；
The storage element, for packing coefficient data, operation relation and the interference light obtained by the data output interface
Spectrum；
The arithmetic element, for producing control signal, and by the signal output interface, by the control signal transmit to
The compression generating unit, so that the compression generating unit applies default size variation model to the photo-curable glue
Enclose, preset change step and the stable state compression group of default constant pressure retention time；
The arithmetic element, it is additionally operable to described dry to what is stored in the memory cell using the coefficient data and operation relation
Relate to spectrum to be handled, obtain wavelength under each stable state compression at the default interference minimum of the interference spectrum and not
With the elasto-optical coefficient of the photo-curable glue under stable state action of compressive stress；
The arithmetic element, it is additionally operable to that the obtained default wavelength interfered at minimum will be handled and different stable states pressure should
The elasto-optical coefficient of the photo-curable glue, which is transmitted into the storage element, under power effect stores.
5. measuring system as claimed in claim 2, it is characterised in that the light source cell is wideband light source unit, for producing
The initial optical signal of raw multiple different wave lengths.
6. a kind of measuring method, it is characterised in that obtain the elasto-optical coefficient of photo-curable glue using measuring system measurement, wherein institute
Stating measuring system includes：Optical signal transmitting unit, processing unit and compression generating unit, the optical signal transmitting unit include
Optical signal cell and conduction optical fiber, the measuring method include：
The processing unit produces control signal, and the control signal is transmitted to the compression generating unit；
The compression generating unit applies default stable state compression in response to the control signal to the photo-curable glue
Group；
The optical signal cell, initial optical signal is produced, transmitted the initial optical signal to described by the conduction optical fiber
Photo-curable glue, the interference light signal that the photo-curable glue reflects under different stable state action of compressive stress is obtained, and be transferred to
The processing unit；
The processing unit, the interference light signal of optical signal cell transmission is handled, the optics is obtained and consolidates
Change elasto-optical coefficient of the glue under different stable state action of compressive stress, and the elasto-optical coefficient is transferred to the storage element.
7. measuring method as claimed in claim 6, it is characterised in that the processing unit includes：Operations Analysis；
Then, the processing unit produces control signal, and the control signal is transmitted to the compression generating unit, specifically
Including：
The Operations Analysis produce control signal according to the modulus of elasticity and Poisson's ratio of the default photo-curable glue,
And the control signal is transmitted to the compression generating unit；
The compression generating unit applies default stable state compression in response to the control signal to the photo-curable glue
Group, specifically include：
The compression generating unit is in response to the control signal, to photo-curable glue application default value scope and in advance
If the stable state compression group of change step, wherein the minimum value of the number range is zero, maximum is consolidated no more than the optics
Change the yield limit of glue.
8. measuring method as claimed in claim 7, it is characterised in that the optical signal cell includes：
Light source cell and fiber coupler；
Then, the optical signal cell produces initial optical signal, is transmitted the initial optical signal to institute by the conduction optical fiber
Photo-curable glue is stated, obtains the interference light signal that the photo-curable glue reflects under different stable state action of compressive stress, and transmit
To the processing unit, specifically include：
The light source cell produces initial optical signal, and the initial optical signal is transported into the fiber coupler；
The initial optical signal that the fiber coupler transmits the light source cell is transmitted to the conduction optical fiber；
The initial optical signal that the conduction optical fiber transmits the fiber coupler is transmitted to the photo-curable glue, is obtained
The interference light signal that the photo-curable glue reflects in the presence of the stable state compression group, and the interference light signal is passed
It is defeated by the fiber coupler；
The interference light signal that the fiber coupler transmits the conduction optical fiber, is transmitted to the processing unit.
9. measuring method as claimed in claim 8, it is characterised in that the processing unit also includes：Spectra collection unit；
The Operations Analysis include arithmetic element and storage element；
Then, the processing unit is handled the interference light signal that the optical signal cell transmits, and obtains the optics
Elasto-optical coefficient of the solidification glue under different stable state action of compressive stress, is specifically included：
The spectra collection unit is handled the interference light signal that the fiber coupler transmits, and obtains the computing
The manageable interference spectrum of unit, and the interference spectrum is transmitted to the storage element；
The interference spectrum that the storage element transmits the spectra collection unit, transmit to the arithmetic element；
The interference spectrum that the arithmetic element is transmitted to the storage element carries out peak-seeking scanning, obtains in each stable state pressure
The wavelength at minimum is preset under stress, and gives the wavelength transmission at the default minimum to the storage element；
The storage element also stores coefficient data, and the coefficient data includes：The size variation model of the stable state compression group
Enclose, change step and the time and the modulus of elasticity of the photo-curable glue, Poisson's ratio, the original thickness and original that keep constant pressure
Refractive index, also stores the recurrence formula for calculating elasto-optical coefficient, and the storage element is by the coefficient data, the operation relation
With the wavelength transmission of the default minimum that is obtained by the arithmetic element to arithmetic element；
Wavelength at the coefficient data that the arithmetic element is transmitted according to the storage element and the default minimum, and
The recurrence formula transmitted according to the storage element：
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Obtain under each stable state compression, the elasto-optical coefficient of the photo-curable glue, and the elasto-optical coefficient is transferred to described
Storage element；
T (σ in formula (1)N) be in size be σNThe stable state compression in the presence of the photo-curable glue elasto-optical coefficient, m
For positive integer, σNFor the size of n-th stable state compression in the stable state compression group, σN-1For in the stable state compression group
The size of the N-1 stable state compression, λ (σN-1) be in size be σN-1The stable state compression in the presence of the default pole
Wavelength at small value, Δ λ (σN) be in size be σNThe stable state compression in the presence of the pre- wavelength variable quantity, L
(σN-1) be in size be σN-1The stable state compression in the presence of the photo-curable glue thickness, Δ L (σN) it is big
Small is σNThe stable state compression in the presence of the photo-curable glue thickness variable quantity, n (σN-1) it is to be in size
σN-1The stable state compression in the presence of the photo-curable glue refractive index, Δ σ is the default change step；
L (the σN-1) and Δ L (σN) can be calculated according to the original length and modulus of elasticity of the photo-curable glue；
N (the σN-1) can be according to the recurrence formula (1) and primary condition：The initial refractive rate n recursion of the photo-curable glue
Obtain.
10. measuring method as claimed in claim 9, it is characterised in that the light source is wideband light source unit, and generation is multiple not
The initial optical signal of co-wavelength；
Then, it is described to obtain presetting under each stable state compression in the wavelength at minimum, the wavelength at the default minimum
Including multigroup wavelength preset under each stable state compression at minimum；
Wavelength at the coefficient data that the arithmetic element is transmitted according to the storage element and the default minimum, and
Obtained according to the recurrence formula (1) that the storage element transmits under each stable state compression, the bullet spectrum of the photo-curable glue
In number,
Ripple at the coefficient data that the arithmetic element is transmitted according to the storage element and multigroup default minimum
It is long, and the recurrence formula (1) transmitted according to the storage element is obtained at the initial optical signal of different wave length, each
Under stable state compression, the elasto-optical coefficient of the photo-curable glue.
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| CN103278507A (en) * | 2013-05-13 | 2013-09-04 | 中国科学院半导体研究所 | Device and method for measuring elasto-optical coefficient of semiconductor material |
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| CN103278507A (en) * | 2013-05-13 | 2013-09-04 | 中国科学院半导体研究所 | Device and method for measuring elasto-optical coefficient of semiconductor material |
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| 邢进华 等: "用光纤白光干涉技术测量晶体的弹光系数", 光子学报, vol. 36, no. 05, pages 890 - 893 * |
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| WO2019090572A1 (en) * | 2017-11-09 | 2019-05-16 | 深圳大学 | Elasto-optical coefficient measurement system and measurement method |
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