WO2019090572A1 - 弹光系数测量系统及测量方法 - Google Patents

弹光系数测量系统及测量方法 Download PDF

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WO2019090572A1
WO2019090572A1 PCT/CN2017/110138 CN2017110138W WO2019090572A1 WO 2019090572 A1 WO2019090572 A1 WO 2019090572A1 CN 2017110138 W CN2017110138 W CN 2017110138W WO 2019090572 A1 WO2019090572 A1 WO 2019090572A1
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unit
compressive stress
optical signal
steady
optical
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English (en)
French (fr)
Inventor
何俊
张哲�
王义平
王英
廖常锐
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Shenzhen University
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Shenzhen University
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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

Definitions

  • the present invention relates to the field of measurement, and in particular to a measurement system and a measurement method.
  • Optical curing adhesives are widely used in various industries.
  • the influence of external stress on the refractive index of optical curing adhesives, that is, the elastic coefficient, is the property of optical curing adhesives that need to be considered.
  • the measurement of the bounce coefficient of optically cured adhesives is particularly important.
  • the existing optical coefficient measuring system of the optical curing glue illuminates the light toward the prism in space.
  • This measuring system has strict requirements on the spatial position and angle of the incident light, and the problem of complicated optical path adjustment is widespread.
  • the invention provides a measuring system for measuring the elastic coefficient of the optical curing glue, which can solve the problem that the space measurement and the angle of the incident light are strict and the optical path adjustment is complicated.
  • the measuring system comprises: an optical signal transmission unit, a processing unit and a compressive stress generating unit;
  • the optical signal transmission unit includes: an optical signal unit and a conductive optical fiber, wherein the optical signal unit is connected to the optical curing adhesive through a conductive optical fiber, and the processing unit is connected to the optical signal unit, and the compressive stress generating unit and the The processing unit is connected;
  • the processing unit is configured to generate a control signal, and transmit the control signal to the compressive stress generating unit, wherein the control signal is used to control the compressive stress generating unit to apply a preset steady state to the optical curing adhesive Compressive stress group
  • the optical signal unit is configured to generate an initial optical signal, transmit the initial optical signal to the optically curable adhesive through the conductive optical fiber, and reflect the optically cured adhesive under different steady-state compressive stress Transmitting an optical signal to the processing unit;
  • the processing unit is further configured to process the interference light signal obtained by the optical signal unit to obtain an elastic coefficient of the optically-cured adhesive under different steady-state compressive stresses.
  • the initial optical signal is transmitted to the optically-curable adhesive through the conductive fiber, the spatial position and angle of the incident light are low, and the optical path adjustment is simple.
  • the invention also provides a measuring method, which can measure the elastic light coefficient of the optical curing glue by using the measuring system, and can solve the problem that the existing measuring method has strict requirements on the spatial position and angle of the incident light and the optical path adjustment is complicated.
  • the measurement system includes: an optical signal transmission unit, a processing unit, and a compressive stress generating unit, wherein the optical signal transmission unit includes an optical signal unit and a conductive optical fiber, and the measuring method includes:
  • the processing unit generates a control signal and transmits the control signal to the compressive stress generating unit;
  • the compressive stress generating unit applies a preset steady-state compressive stress group to the optically-cured adhesive in response to the control signal;
  • the optical signal unit generates an initial optical signal, and transmits the initial optical signal to the optically-curable adhesive through the conductive optical fiber to obtain an interference optical signal reflected by the optically-cured adhesive under different steady-state compressive stresses. And transmitting to the processing unit;
  • the processing unit processes the interference light signal transmitted by the optical signal unit to obtain an elastic coefficient of the optically-cured adhesive under different steady-state compressive stress, and transmits the elastic optical coefficient to the Storage unit.
  • the initial optical signal is transmitted to the optically-curable adhesive through the conductive fiber, the spatial position and angle of the incident light are low, and the optical path adjustment is simple.
  • FIG. 1 is a schematic structural diagram of a measurement system according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of reflection of an initial optical signal at an optically cured glue in a measurement system according to a first embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a measurement system according to a second embodiment of the present invention.
  • FIG. 4 is a flowchart of a measurement method according to a third embodiment of the present invention.
  • FIG. 5 is a flowchart of a measurement method according to a fourth embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a measurement system according to a first embodiment of the present invention.
  • the measurement system is configured to measure an elastic coefficient of an optical curing adhesive.
  • the measurement system includes: an optical signal transmission unit 110 and a processing unit. 120 and compressive stress generating unit 130.
  • the optical signal transmission unit 110 includes an optical signal unit 111 and a conductive optical fiber 112.
  • the optical signal unit 111 is connected to the optical curing adhesive 140 through the conductive optical fiber 112, and the processing unit 120 is connected to the optical signal unit 111.
  • the compressive stress generating unit 130 and the processing unit 120 are connected. connection.
  • the processing unit 120 is configured to generate a control signal, and transmit the control signal to the compressive stress generating unit 130,
  • the control signal is used to control the compressive stress generating unit 130 to apply a predetermined steady state compressive stress group to the optical curing adhesive 140.
  • the optical signal unit 111 is configured to generate an initial optical signal, transmit the initial optical signal to the optical curing adhesive 140 through the conductive optical fiber 112, and transmit the interference optical signal reflected by the optical curing adhesive 140 under different steady-state compressive stresses to the processing unit. 120.
  • the processing unit 120 is further configured to process the interference light signal obtained by the optical signal unit 111 to obtain an elastic coefficient of the optical curing adhesive 140 under different steady-state compressive stresses.
  • FIG. 2 is a schematic diagram of reflection of an initial optical signal in an optical curing adhesive in a measurement system according to a first embodiment of the present invention.
  • the initial optical signal is transmitted to the optical curing adhesive 140 through the conductive optical fiber 112.
  • the initial optical signals are respectively reflected by the first reflective surface I and the second reflective surface II of the optically-curable adhesive to form a first reflected light signal and a second reflected light signal, and the first reflected light signal and the second reflected light signal are The wavelengths are the same, but the phases are different.
  • the optical curing adhesive 140 reflects the interference.
  • Optical signal is transmitted to the optical curing adhesive 140 through the conductive optical fiber 112.
  • the initial optical signals are respectively reflected by the first reflective surface I and the second reflective surface II of the optically-curable adhesive to form a first reflected light signal and a second reflected light signal, and the first reflected light signal and the second reflected light signal are The wavelengths are the same, but the phases are different.
  • the initial optical signal is transmitted to the optically-cured adhesive through the conductive fiber, the spatial position and angle of the incident light are low, and the optical path adjustment is simple.
  • FIG. 3 is a schematic structural diagram of a measurement system according to a second embodiment of the present invention, which is used for measuring an elastic coefficient of an optically-curable adhesive. Unlike the measurement system shown in FIG. 1, in this embodiment, in:
  • the optical signal unit 111 includes a light source unit 113 and a fiber coupler 114.
  • the fiber coupler includes a first interface, a second interface, and a third interface.
  • the light source unit 113 is connected to the fiber coupler 114 through a first interface.
  • the fiber coupler 114 is coupled to one end of the conductive fiber 112 through a second interface.
  • the optically cured adhesive 140 is cured at the other end of the conductive fiber 112.
  • Processing unit 120 is coupled to fiber coupler 114 via a third interface.
  • the light source unit 113 is configured to generate an initial optical signal and transmit the initial optical signal to the fiber coupler 114 through the first interface.
  • the fiber coupler 114 is configured to transmit the initial optical signal obtained by the first interface to the conductive fiber 112 through the second interface.
  • the conductive fiber 112 is configured to transmit the initial optical signal obtained by the second interface to the optical curing adhesive 140, and transmit the interference optical signal reflected by the optical curing adhesive 140 under different steady-state compressive stresses to the optical fiber coupler through the second interface. 114.
  • the fiber coupler 114 is further configured to transmit the interference optical signal obtained by the second interface to the processing unit 120 through the third interface.
  • the fiber coupler 114 is a tree fiber coupler, a star fiber coupler or a fiber circulator.
  • the conductive fiber 112 is a single-mode fiber of a total internal reflection type, a multimode fiber or a photonic crystal structure, a single mode fiber, a multimode fiber or a hollow fiber, and a plastic fiber.
  • one end surface of the conductive optical fiber 112 is cut flat by a fiber cutter, the optical curing adhesive 140 is attached to the end surface, and then the optical curing adhesive 140 is irradiated with the optical curing adhesive light source for a sufficient time to make the optical curing adhesive 140 is cured on the end face of the conductive fiber 112.
  • the processing unit 120 includes a spectrum acquisition unit 121 and an operation control unit 122.
  • the spectral acquisition unit 121 includes a data output interface.
  • the arithmetic control unit 122 includes a signal output interface.
  • the spectral acquisition unit 121 is coupled to the fiber coupler 114 via a third interface.
  • the spectrum acquisition unit 121 is connected to the arithmetic control unit 122 via a data output interface.
  • the arithmetic control unit 122 is connected to the compressive stress generating unit 130 via a signal output interface.
  • the operation control unit 122 is configured to generate a control signal, and transmit the control signal to the compressive stress generating unit 130 through the signal output interface, so that the compressive stress generating unit 130 applies the optical curing adhesive 140 A set of steady-state compressive stresses with a preset size change range, a preset change step size, and a preset constant pressure hold time.
  • the fiber coupler 114 is further configured to transmit the interference light signal reflected by the optical curing adhesive 140 under different steady-state compressive stresses to the spectrum collecting unit 121 through the third interface.
  • the spectrum acquisition unit 121 is configured to convert the interference light signal obtained by the third interface into an interference spectrum that can be processed by the operation control unit 122, and transmit the interference spectrum to the operation control unit 122 through the data output interface.
  • the operation control unit 122 is further configured to calculate the elastic coefficient of the optical curing adhesive 140 according to the interference spectrum obtained by the data input interface and the preset data and operation relationship stored in the operation control unit 122.
  • the minimum value of the range in the range of the magnitude of the steady-state compressive stress group is zero, and the maximum value does not exceed the yield limit of the optically-curable adhesive 140.
  • the maximum does not exceed the proportional limit of the optically curable adhesive 140, maintaining a linear relationship between stress and strain to simplify the calculation of the bounce coefficient of the optically cured adhesive 140.
  • the steady-state compressive stress group applies a steady-state compressive stress group to the optical curing adhesive 140 with the same preset change step and the preset constant pressure holding time within a preset size variation range.
  • the optically-cured adhesive not only generates a first strain in a direction parallel to the steady-state compressive stress group, but also generates a second direction in a direction perpendicular to the steady-state compressive stress group.
  • the ratio of the first strain to the second strain is the Poisson's ratio of the optical curing adhesive 140.
  • the second strain causes a change in the area of the optical curing adhesive 140.
  • the arithmetic control unit 122 controls the compressive stress generating unit 130 to apply a steady-state compressive stress to the optically cured adhesive. At this time, it is also necessary to control the compressive stress generating unit 130 to correct the applied pressure according to the elastic modulus and the Poisson's ratio of the optical curing adhesive 140 so that the changing step size of the steady-state compressive stress group remains unchanged.
  • the arithmetic control unit 122 includes an arithmetic unit 123 and a storage unit 124.
  • the spectrum acquisition unit 121 is connected to the arithmetic unit 123 via a data output interface.
  • the storage unit 124 is connected to the arithmetic unit 123.
  • the arithmetic unit 123 is connected to the compressive stress generating unit 130 through a signal output interface.
  • the storage unit 124 is configured to store coefficient data, an operation relationship, and an interference spectrum obtained by the data output interface.
  • the operation unit 123 is configured to generate a control signal, and transmit the control signal to the compressive stress generating unit 130 through the signal output interface, so that the compressive stress generating unit applies a predetermined size range to the optical curing adhesive 140 to preset a step size and A set of steady-state compressive stresses that preset a constant pressure hold time.
  • the operation unit 123 is further configured to process the interference spectrum stored in the storage unit 124 by using the coefficient data and the operation relationship, and obtain the wavelength at the preset interference minimum value and the different steady-state pressure of the interference spectrum under each steady-state compressive stress.
  • the elastic coefficient of the optically cured adhesive 140 under stress is further configured to process the interference spectrum stored in the storage unit 124 by using the coefficient data and the operation relationship, and obtain the wavelength at the preset interference minimum value and the different steady-state pressure of the interference spectrum under each steady-state compressive stress.
  • the operation unit 123 is further configured to transmit the wavelength at the preset interference minimum value obtained by the processing and the elastic light coefficient of the optical curing adhesive 140 under different steady-state compressive stresses to the storage unit 124 for storage.
  • the storage unit 124 further includes a data read-in interface and a result output interface, where the data read-in interface is used to read coefficient data from the outside, and the coefficient data includes a size variation range and a change step size of the steady-state compressive stress group. And constant pressure holding time, elastic modulus, Poisson's ratio, original refractive index and original thickness of the optically cured adhesive 140.
  • the result output interface is for outputting the bounce coefficient obtained by the operation unit 123 to the outside.
  • the operation control unit 122 further includes a display screen, and the display screen is connected to the operation unit 123.
  • the storage unit 124 transmits the calculation result of the elastic coefficient to the operation unit 123, and the operation unit 123 uses the elastic coefficient obtained by the storage unit 124.
  • the calculation result is converted into a display signal recognizable by the display screen, and the display signal is transmitted to the display screen, and the display screen visually outputs the calculation result of the elastic light coefficient according to the display signal obtained by the operation unit 123.
  • the light source unit 113 is a broadband light source unit for generating a plurality of initial optical signals of different wavelengths, so that the measuring system provided by the embodiment can simultaneously measure the optical curing adhesive 140 under different steady-state compressive stresses and differently.
  • the coefficient of elasticity at the wavelength of the initial optical signal is a broadband light source unit for generating a plurality of initial optical signals of different wavelengths, so that the measuring system provided by the embodiment can simultaneously measure the optical curing adhesive 140 under different steady-state compressive stresses and differently.
  • the coefficient of elasticity at the wavelength of the initial optical signal is a broadband light source unit for generating a plurality of initial optical signals of different wavelengths
  • the initial optical signal is transmitted to the optically-curable adhesive through the conductive fiber, the spatial position and angle of the incident light are low, and the optical path adjustment is simple.
  • the steady-state compressive stress group generated by the compressive stress generating unit is controlled to keep the change step of the steady-state compressive stress group constant, thereby simplifying the calculation of the elastic coefficient.
  • the light source unit is a broadband light source unit, an initial optical signal including a plurality of different wavelengths can be generated, so that the measuring system can simultaneously measure the optical curing adhesive under different steady-state compressive stresses and at different initial light. The coefficient of elasticity at the wavelength of the signal.
  • FIG. 4 is a flowchart of a measurement method according to a third embodiment of the present invention.
  • the measurement method uses a measurement system to measure an elastic coefficient of an optically cured glue, wherein the measurement system includes: an optical signal transmission unit, and processing. Unit and compressive stress generating unit.
  • the optical signal transmission unit includes: an optical signal unit and a conductive optical fiber.
  • the measurement method includes the following steps:
  • the processing unit generates a control signal, and transmits the control signal to the compressive stress generating unit.
  • the compressive stress generating unit applies a preset steady-state compressive stress group to the optically-cured adhesive in response to the control signal.
  • the optical signal unit generates an initial optical signal, and the initial optical signal is transmitted to the optical curing glue through the conductive optical fiber, and the interference optical signal reflected by the optically solidified adhesive under different steady-state compressive stress is obtained and transmitted to the optical curing adhesive. Processing unit.
  • the processing unit processes the interference optical signal transmitted by the optical signal unit to obtain an elastic coefficient of the optically cured adhesive under different steady-state compressive stress, and transmits the elastic optical coefficient to the storage unit.
  • the initial optical signal is transmitted to the optically-curable adhesive through the conductive fiber, the spatial position and angle of the incident light are low, and the optical path adjustment is simple.
  • FIG. 5 is a flowchart of a measurement method according to a fourth embodiment of the present invention.
  • the measurement method is applied to a measurement system for measuring an elastic coefficient of an optically curable adhesive.
  • the measurement system to which the measurement method provided by the third embodiment is applied is different in this embodiment:
  • the processing unit includes an operation control unit, and the measurement method mainly includes the following steps:
  • the operation control unit generates a control signal according to a preset elastic modulus and a Poisson's ratio of the optical curing adhesive, and transmits the control signal to the compressive stress generating unit.
  • the compressive stress generating unit applies a preset value range and a steady-state compressive stress group of a preset change step to the optical curing glue in response to the control signal, wherein the minimum value of the numerical range is zero, and the maximum value does not exceed The yield limit of the optically cured adhesive.
  • the maximum value of the range of values does not exceed the yield limit of the optically cured adhesive to ensure that the optically cured adhesive does not undergo plastic deformation under the action of the steady state compressive stress group.
  • the steady-state compressive stress group includes a plurality of different-sized steady-state compressive stresses, which are called steady-state compressive stresses, and these steady-state compressive stresses are arranged in ascending order of magnitude, each adjacent stable The difference between the magnitudes of the compressive stresses is the preset change step size.
  • the compressive stress generating unit applies a steady-state compressive stress to the optically cured adhesive
  • the steady-state compressive stress needs to be maintained for a period of time, and then the steady-state compressive stress is changed, and the time is maintained. Constant pressure time.
  • a change in the magnitude of the steady-state compressive stress is referred to as excitation, and the measurement system produces a response under the excitation, the response including a steady-state response and a transient response, wherein the intensity of the transient response decreases over time.
  • the transient response causes an error in the measurement, so it is necessary to maintain a constant voltage for a period of time to reduce the intensity of the transient response to reduce the transient response to the measurement result. The effect of improving the accuracy of the measurement results, and the longer the constant voltage is maintained, the more accurate the measurement results.
  • the optical signal unit generates an initial optical signal, and the initial optical signal is transmitted to the optical curing adhesive through the conductive optical fiber, and the interference optical signal reflected by the optical curing adhesive under different steady-state compressive stress is obtained and transmitted to the optical curing adhesive. Processing unit.
  • the optical signal unit includes a light source unit and a fiber coupler.
  • step S403 specifically includes:
  • the light source unit generates an initial optical signal and transmits the initial optical signal to the fiber coupler.
  • the fiber coupler transmits the initial optical signal transmitted by the light source unit to the conductive fiber.
  • the conducting optical fiber transmits the initial optical signal transmitted by the optical fiber coupler to the optical curing adhesive, and obtains an interference optical signal reflected by the optical curing adhesive under the action of the steady-state compressive stress group, and transmits the interference optical signal to the optical fiber The fiber coupler.
  • the fiber coupler transmits the interference optical signal transmitted by the conductive fiber to the processing unit.
  • the processing unit processes the interference optical signal transmitted by the optical signal unit to obtain an elastic coefficient of the optically cured adhesive under different steady-state compressive stress, and transmits the elastic optical coefficient to the storage unit.
  • the processing unit also includes a spectral acquisition unit.
  • the arithmetic control unit includes an arithmetic unit and a storage unit.
  • step S404 is as follows:
  • the spectrum acquisition unit processes the interference optical signal transmitted by the fiber coupler to obtain an interference spectrum that can be processed by the operation unit, and transmits the interference spectrum to the storage unit.
  • the spectral acquisition unit converts the interference optical signal transmitted by the fiber coupler into a continuous interference spectrum in the frequency domain, wherein the continuous interference spectrum has an abscissa of wavelength and a vertical coordinate of power spectral density. Then, the continuous interference spectrum is sampled according to a preset sampling wavelength interval, and a discrete interference spectrum in the frequency domain is obtained.
  • the discrete interference spectrum is a power spectral density vector, and the power spectral density vector is an interference spectrum that the arithmetic unit can process. .
  • the spectral acquisition unit transmits the power spectral density vector to the storage unit.
  • the storage unit also stores a sampling wavelength interval of the spectral acquisition unit.
  • the storage unit transmits the interference spectrum transmitted by the spectrum acquisition unit to the operation unit.
  • the arithmetic unit performs a peak-searching scan on the interference spectrum obtained by the storage unit, and obtains a stable at each
  • the wavelength at the minimum value is preset under the state compressive stress, and the wavelength at the preset minimum value is transmitted to the storage unit.
  • the peaking scan is implemented by the operation unit performing a minimum value search on the power spectral density vector transmitted by the storage unit within a preset range, obtaining a minimum power spectral density, and reading the minimum power spectral density.
  • the minimum power spectral density is the preset minimum value. Therefore, the wavelength at the preset minimum value can be obtained by a single peak-seeking scan under the action of a steady-state compressive stress.
  • the interference optical signal reflected by the optical curing adhesive changes, and the power spectral density vector obtained by the spectral collecting unit also changes, and the serial number of the power spectral density vector increases simultaneously. Or the same value is reduced at the same time, but the magnitude of the power spectral density does not change, that is, the power spectral density vector drifts, and the amount of change of the serial number is called the drift amount.
  • the vector number corresponding to the minimum power spectral density changes, that is, the wavelength at the preset minimum value changes. Therefore, the wavelength at the preset minimum value can be obtained by real-time peak-seeking scanning under the action of each steady-state compressive stress.
  • the operation unit transmits the wavelength at the preset minimum value to the storage unit under the action of each steady-state compressive stress, and the storage unit sequentially stores the wavelength at the preset minimum value in the form of a vector. This sequence is the same as the order of the steady state compressive stresses in the steady state compressive stress group.
  • the storage unit further stores coefficient data, the coefficient data includes: a range of size changes of the steady-state compressive stress group, a change step size, a time for maintaining a constant voltage, and an elastic modulus, a Poisson's ratio, and an original of the optical curing adhesive. a thickness and an original refractive index, and a recursive formula for calculating an elastic coefficient of the optically curable adhesive, the storage unit, the coefficient data, the recursive formula, and a wavelength at the preset minimum value obtained by the arithmetic unit Transfer to the arithmetic unit.
  • the change step of the steady-state compressive stress group is constant, and the magnitude of each steady-state compressive stress in the steady-state compressive stress group is stored in the storage unit in the form of a vector. in.
  • the storage unit includes a coefficient data output interface, the coefficient data can be obtained from the outside, and the stored coefficient data can be modified.
  • the operation unit is based on the coefficient data obtained by the storage unit and the wavelength at the preset minimum value, and according to a recursion formula obtained by the storage unit:
  • m is a constant, and the coefficient data also includes the size of m.
  • the optically cured glue and the conductive fiber form a fiber Fabry-Perot interferometer.
  • the wavelength at the interference minimum value that is, the wavelength corresponding to the minimum power spectral density, is expressed as:
  • the preset variation step size ⁇ in the steady-state compressive stress group is a small value, so that the change in the steady-state compressive stress causes the thickness variation and the refractive index change of the optical curing adhesive to be small.
  • Value, in turn, in equation (3) The value of the term is so small that the influence on the calculation result is negligible, and the smaller the ⁇ , the smaller the influence of the term on the calculation result, and the more accurate the measurement result.
  • ⁇ cannot be too small, and when ⁇ is too small, the amount of change ⁇ ( ⁇ N ) of the wavelength at the preset minimum value is smaller than the minimum sampling wavelength interval of the spectrum acquisition unit, and the spectrum acquisition unit cannot sense the preset minimum value. The change in wavelength causes errors in the measurement.
  • ⁇ should make the minimum value of the variation of the wavelength at the preset minimum value larger than the sampling wavelength interval of the spectral acquisition unit. Twice.
  • L( ⁇ N-1 ) and ⁇ L( ⁇ N ) can be calculated from the original length and elastic modulus of the optically cured adhesive.
  • the following is a linear description of the relationship between stress and strain, and does not limit the relationship between stress and strain of the optically cured adhesive. According to the characteristics of the optically cured adhesive and the magnitude of the stress, stress and strain Relationships can also be non-linear.
  • the enthalpy ( ⁇ N-1 ) in the formula (6) is the strain generated by the optically curable adhesive under the action of the steady-state compressive stress of the size ⁇ N-1 , and E is the elastic modulus of the optically curable adhesive.
  • L( ⁇ N-1 ) can be calculated according to the formula (8).
  • L is the original thickness of the optically curable adhesive, that is, the thickness when the optically curable adhesive is not subjected to the steady-state compressive stress.
  • L( ⁇ N ) in the formula (9) can be calculated according to the formula (8).
  • n( ⁇ N-1 ) can be obtained iteratively according to the recursive formula (1) and the initial condition: the original refractive index n of the optically cured glue.
  • the light source unit is a broadband light source unit for generating a plurality of initial light signals of different wavelengths.
  • the preset minimum value is The wavelength includes a plurality of sets of wavelengths at predetermined minimum values for each steady state compressive stress.
  • the optical curing adhesive has a first reflective surface and a second reflective surface, and the initial optical signal is reflected by the first reflective surface to obtain a first reflected light signal, and the initial optical signal is reflected by the second reflective surface to obtain a second reflection.
  • the optical signal, the first reflected light signal and the second reflected light signal have the same wavelength and different phases, and the first reflected light signal and the second reflected light signal interfere to form an interference light signal.
  • the phase difference between the first reflected light signal and the second reflected light signal is different, and multiple sets of different interference light signals are obtained, and the initial optical signals of each wavelength correspond to A set of interfering light signals.
  • each set of continuous interference optical signals is respectively converted into discrete interference spectra in the frequency domain, and each set of interference spectra is sequentially transmitted to the storage in the form of vectors.
  • the unit, the storage unit stores the vectors in the form of a matrix, and the initial optical signal of each wavelength corresponds to a set of vectors.
  • the storage unit transmits the matrix to the operation unit, and the operation unit performs peak-searching on the matrix according to the direction of the vector, searches for the serial number corresponding to the minimum value in each vector, and obtains each minimum value according to the serial number.
  • the initial optical signal for each wavelength corresponds to a set of wavelengths at a predetermined minimum at each steady state compressive stress.
  • the operation unit calculates, according to the coefficient data obtained by the storage unit and the wavelength at the preset minimum value, and calculates each steady-state compressive stress according to the recursion formula (1) obtained by the storage unit, Among the elastic coefficients of optical curing adhesives,
  • the operation unit calculates the initial optical signal of different wavelengths according to the coefficient data obtained by the storage unit and the plurality of sets of wavelengths at the preset minimum value, and according to a recursion formula (1) obtained by the storage unit At each steady state compressive stress, the optical coefficient of the optically cured adhesive.
  • the arithmetic control unit controls the steady-state compressive stress group generated by the compressive stress generating unit to keep the change step of the steady-state compressive stress group constant, thereby simplifying the calculation of the elastic coefficient.
  • the optical curing coefficient of the optically cured adhesive under different steady-state compressive stresses and at different wavelengths of the initial optical signals is obtained at the same time, so the measurement efficiency is high.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium to which it is obtained may be a read only memory, a magnetic disk or an optical disk or the like.

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Abstract

一种可简化光路调节的弹光系数测量系统和测量方法。该测量系统包括：光信号传输单元（110）、处理单元（120）和压应力发生单元（130）。光信号传输单元（110）包括：光信号单元（111）和传导光纤（112），光信号单元（111）通过传导光纤（112）与光学固化胶（140）连接，处理单元（120）与光信号单元（111）连接，压应力发生单元（130）与处理单元（120）连接。处理单元（120），用于产生控制信号，将控制信号传输至压应力发生单元（130），控制信号用于控制压应力发生单元（130）对光学固化胶（140）施加应力。光信号单元（111），用于产生初始光信号，将初始光信号通过传导光纤（112）传输至光学固化胶（140），并将光学固化胶（140）在不同应力下反射的干涉光信号传输至处理单元（120）。处理单元（120），还用于处理干涉光信号，得到光学固化胶（140）的弹光系数。

Description

[根据细则37.2由ISA制定的发明名称]　弹光系数测量系统及测量方法 技术领域
本发明涉及测量领域，尤其涉及一种测量系统和一种测量方法。
背景技术
光学固化胶在各行业均有广泛的应用，当光学固化胶用作光学介质时，外界应力对光学固化胶的折射率的影响，即弹光系数，是需要被着重考虑的光学固化胶的性质。对光学固化胶的弹光系数的测量显得尤为重要。
现有的光学固化胶的弹光系数测量系统在空间中将光照射向棱镜，这种测量系统对入射光的空间位置和角度的要求严格，普遍存在光路调节复杂的问题。
发明内容
本发明提供一种测量系统，用于测量光学固化胶的弹光系数，可以解决现有测量系统的对入射光的空间位置和角度的要求严格，光路调节复杂的问题。
该测量系统包括：光信号传输单元、处理单元和压应力发生单元；
所述光信号传输单元包括：光信号单元和传导光纤，所述光信号单元通过传导光纤与所述光学固化胶连接，所述处理单元与所述光信号单元连接，所述压应力发生单元与所述处理单元连接；
所述处理单元，用于产生控制信号，将所述控制信号传输至所述压应力发生单元，所述控制信号用于控制所述压应力发生单元对所述光学固化胶施加预设的稳态压应力组；
所述光信号单元，用于产生初始光信号，将所述初始光信号通过所述传导光纤传输至所述光学固化胶，并将所述光学固化胶在不同稳态压应力作用下反射的干涉光信号传输至所述处理单元；
所述处理单元，还用于处理由所述光信号单元获得的干涉光信号，以得到所述光学固化胶在不同稳态压应力作用下的弹光系数。
该测量系统，由于通过传导光纤将初始光信号传递至光学固化胶，故对入射光的空间位置和角度的要求低，光路调节简单。
本发明还提供一种测量方法，利用测量系统测量得到光学固化胶的弹光系数，可以解决现有测量方法的对入射光的空间位置和角度的要求严格，光路调节复杂的问题。
其中所述测量系统包括：光信号传输单元、处理单元和压应力发生单元，所述光信号传输单元包括光信号单元和传导光纤，所述测量方法包括：
所述处理单元产生控制信号，并将所述控制信号传输至所述压应力发生单元；
所述压应力发生单元响应于所述控制信号，对所述光学固化胶施加预设的稳态压应力组；
所述光信号单元，产生初始光信号，通过所述传导光纤将所述初始光信号传输至所述光学固化胶，获取所述光学固化胶在不同稳态压应力作用下反射的干涉光信号，并传输给所述处理单元；
所述处理单元，对所述光信号单元传输的所述干涉光信号进行处理，得到所述光学固化胶在不同稳态压应力作用下的弹光系数，并将所述弹光系数传输给所述储存单元。
该测量方法，由于通过传导光纤将初始光信号传递至光学固化胶，故对入射光的空间位置和角度的要求低，光路调节简单。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明第一实施例提供的测量系统的结构示意图；
图2为本发明第一实施例提供的测量系统中初始光信号在光学固化胶处的反射示意图；
图3为本发明第二实施例提供的测量系统的结构示意图；
图4为本发明第三实施例提供的测量方法的流程图；
图5为本发明第四实施例提供的测量方法的流程图。
具体实施方式
为使得本发明的发明目的、特征、优点能够更加的明显和易懂，下面将结合本发明实施例提供的附图，对本发明实施例提供的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而非全部实施例。基于本发明提供的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1所示，图1为本发明第一实施例提供的测量系统的结构示意图，该测量系统用于测量光学固化胶的弹光系数，该测量系统包括：光信号传输单元110、处理单元120和压应力发生单元130。
光信号传输单元110包括：光信号单元111和传导光纤112，光信号单元111通过传导光纤112与光学固化胶140连接，处理单元120与光信号单元111连接，压应力发生单元130与处理单元120连接。
处理单元120，用于产生控制信号，将控制信号传输至压应力发生单元130， 该控制信号用于控制压应力发生单元130对光学固化胶140施加预设的稳态压应力组。
光信号单元111，用于产生初始光信号，将初始光信号通过传导光纤112传输至光学固化胶140，并将光学固化胶140在不同稳态压应力作用下反射的干涉光信号传输至处理单元120。
处理单元120，还用于处理由光信号单元111获得的干涉光信号，以得到光学固化胶140在不同稳态压应力作用下的弹光系数。
需要说明的是，如图2所示，图2为本发明第一实施例提供的测量系统中初始光信号在光学固化胶处的反射示意图，初始光信号通过传导光纤112传输至光学固化胶140后，初始光信号分别被光学固化胶的第一反射面Ⅰ和第二反射面Ⅱ反射，形成第一反射光信号和第二反射光信号，该第一反射光信号和第二反射光信号的波长相同，但相位不同，第一反射光信号与第二反射光信号叠加后，在某些相位上相互增强，在某些相位上相互抵消，发生干涉效应，故光学固化胶140反射的是干涉光信号。
本实施例提供的测量系统，由于通过传导光纤将初始光信号传递至光学固化胶，故对入射光的空间位置和角度的要求低，光路调节简单。
如图3所示，图3为本发明第二实施例提供的测量系统的结构示意图，用于测量光学固化胶的弹光系数，与图1所示的测量系统不同的是，在本实施例中：
进一步地，光信号单元111包括光源单元113和光纤耦合器114。
光纤耦合器包括第一接口、第二接口和第三接口。
光源单元113通过第一接口与光纤耦合器器114连接。
光纤耦合器114通过第二接口与传导光纤112的一端连接。
光学固化胶140固化在传导光纤112的另一端。
处理单元120通过第三接口与光纤耦合器114连接。
光源单元113，用于产生初始光信号并通过第一接口将初始光信号传递至光纤耦合器114。
光纤耦合器114，用于将由第一接口获得的初始光信号，通过第二接口传递至传导光纤112。
传导光纤112，用于将由第二接口获得的初始光信号传输至光学固化胶140，并将光学固化胶140在不同稳态压应力作用下反射的干涉光信号通过第二接口传输至光纤耦合器114。
光纤耦合器114，还用于将由第二接口获得的干涉光信号，通过第三接口传输至处理单元120。
可选的，光纤耦合器114为树形光纤耦合器、星型光纤耦合器或光纤环形器。
可选的，传导光纤112为全内反射型的单模光纤、多模光纤或光子晶体结构的单模光纤、多模光纤或空芯光纤、塑料光纤中的一种。
使用时，利用光纤切刀将传导光纤112的一个端面切割平整，将光学固化胶140附着在该端面上，然后利用光学固化胶固化光源照射光学固化胶140足够长的时间，以使光学固化胶140固化在传导光纤112的该端面上。
进一步地，如图3所示，处理单元120包括光谱采集单元121和运算控制单元122。
光谱采集单元121包括数据输出接口。
运算控制单元122包括信号输出接口。
光谱采集单元121通过第三接口与光纤耦合器114连接。
光谱采集单元121通过数据输出接口与运算控制单元122连接。
运算控制单元122通过信号输出接口与压应力发生单元130连接。
运算控制单元122，用于产生控制信号，并通过信号输出接口将该控制信号传输至压应力发生单元130，以使压应力发生单元130对光学固化胶140施 加预设大小变化范围、预设变化步长和预设恒压保持时间的稳态压应力组。
光纤耦合器114，还用于通过第三接口，将在不同稳态压应力的作用下光学固化胶140反射的干涉光信号传输至光谱采集单元121。
光谱采集单元121，用于将由第三接口获得的干涉光信号转化为运算控制单元122可处理的干涉光谱，并通过数据输出接口将该干涉光谱传输至运算控制单元122。
运算控制单元122，还用于根据由数据输入接口获得的干涉光谱和储存于运算控制单元122中的预设的数据及运算关系，计算得光学固化胶140的弹光系数。
稳态压应力组的大小变化范围中该范围的最小值为零，最大值不超过光学固化胶140的屈服极限。
更佳的，该最大值不超过光学固化胶140的比例极限，使应力与应变的关系保持为线性关系，以简化光学固化胶140的弹光系数的计算。
需要说明的是，该稳态压应力组在预设的大小变化范围内，以相同的预设变化步长和预设恒压保持时间对光学固化胶140施加稳态压应力组。在该稳态压应力组的作用下，光学固化胶不仅会在与该稳态压应力组平行的方向上产生第一应变，还会在与该稳态压应力组垂直的方向上产生第二应变，该第一应变与该第二应变的比值即为光学固化胶140的泊松比。该第二应变会导致光学固化胶140的面积发生变化，故为了使稳态压应力组的变化步长保持不变，运算控制单元122控制压应力发生单元130对光学固化胶施加稳态压应力时，还需要控制压应力发生单元130根据光学固化胶140的弹性模量和泊松比对施加的压力大小进行修正，以使稳态压应力组的变化步长保持不变。
进一步地，如图3所示，运算控制单元122包括运算单元123和储存单元124。
光谱采集单元121通过数据输出接口与运算单元123连接。
储存单元124与运算单元123连接。
运算单元123通过信号输出接口与压应力发生单元130连接。
储存单元124，用于储存系数数据、运算关系以及由数据输出接口获得的干涉光谱。
运算单元123，用于产生控制信号，并通过信号输出接口，将该控制信号传输至压应力发生单元130，以使压应力发生单元对光学固化胶140施加预设大小范围预设变化步长和预设恒压保持时间的稳态压应力组。
运算单元123，还用于利用系数数据和运算关系对存储单元124中存储的干涉光谱进行处理，得到每个稳态压应力下干涉光谱的预设干涉极小值处的波长以及不同稳态压应力作用下光学固化胶140的弹光系数。
运算单元123，还用于将处理得到的预设干涉极小值处的波长以及不同稳态压应力作用下光学固化胶140的弹光系数传输至储存单元124中存储。
可选的，储存单元124还包括数据读入接口和结果输出接口，该数据读入接口，用于从外界读入系数数据，该系数数据包括稳态压应力组的大小变化范围、变化步长和恒压保持时间，光学固化胶140的弹性模量、泊松比、原始折射率和原始厚度。该结果输出接口用于将由运算单元123获得的弹光系数对外输出。
可选的，运算控制单元122还包括显示屏，显示屏与运算单元123连接，储存单元124将弹光系数的计算结果传输至运算单元123，运算单元123将由储存单元124获得的弹光系数的计算结果转换为该显示屏可识别的显示信号，并将该显示信号传输至该显示屏，显示屏根据由运算单元123获得的显示信号将弹光系数的计算结果可视化输出。
进一步地，光源单元113为宽带光源单元，用于产生多个不同波长的初始光信号，使本实施例提供的测量系统可同时测量光学固化胶140在不同稳态压应力的作用下和在不同初始光信号的波长处的弹光系数。
本实施例提供的测量系统，第一方面，由于通过传导光纤将初始光信号传递至光学固化胶，故对入射光的空间位置和角度的要求低，光路调节简单。第二方面，由于具有运算控制单元，控制压应力发生单元产生的稳态压应力组，使该稳态压应力组的变化步长保持不变，故简化了弹光系数的计算。第三方面，由于光源单元为宽带光源单元，可以产生包括多个不同波长的初始光信号，故可使本测量系统可同时测量光学固化胶在不同稳态压应力的作用下和在不同初始光信号的波长处的弹光系数。
如图4所示，图4为本发明第三实施例提供的测量方法的流程图，该测量方法利用测量系统测量得到光学固化胶的弹光系数，其中测量系统包括：光信号传输单元、处理单元和压应力发生单元。该光信号传输单元包括：光信号单元和传导光纤。该测量方法包括以下步骤：
S301、该处理单元产生控制信号，并将该控制信号传输至该压应力发生单元。
S302、该压应力发生单元响应于该控制信号，对该光学固化胶施加预设的稳态压应力组。
S303、该光信号单元产生初始光信号，通过该传导光纤将该初始光信号传输至该光学固化胶，获取该光学固化胶在不同稳态压应力作用下反射的干涉光信号，并传输给该处理单元。
S304、该处理单元对该光信号单元传输的该干涉光信号进行处理，得到该光学固化胶在不同稳态压应力作用下的弹光系数，并将该弹光系数传输给该储存单元。
本实施例提供的测量方法，由于通过传导光纤将初始光信号传递至光学固化胶，故对入射光的空间位置和角度的要求低，光路调节简单。
如图5所示，图5为本发明第四实施例提供的测量方法的流程图，该测量方法应用于一种测量系统，用于测量光学固化胶的弹光系数，该测量系统与第 三实施例提供的测量方法应用的测量系统不同的是，在本实施例中：
进一步地，该处理单元包括运算控制单元，则该测量方法主要包括以下步骤：
S401、该运算控制单元根据预设的该光学固化胶的弹性模量和泊松比，产生控制信号，并将该控制信号传输至该压应力发生单元。
S402、该压应力发生单元响应于该控制信号，对该光学固化胶施加预设数值范围和预设变化步长的稳态压应力组，其中该数值范围的最小值为零，最大值不超过该光学固化胶的屈服极限。
该数值范围的最大值不超过光学固化胶的屈服极限，以保证光学固化胶不在该稳态压应力组的作用下产生塑性形变。
需要说明的是，稳态压应力组中包括多个不同大小的稳态压应力，这些稳态压应力称为稳态压应力，这些稳态压应力按大小升序排列，每个相邻的稳态压应力间大小的差值即为预设变化步长。
为了提高测量的准确性，该压应力发生单元对光学固化胶施加一个稳态压应力后，需要将该稳态压应力保持一段时间，再改变该稳态压应力的大小，该时间即为保持恒压时间。
对于测量系统，将稳态压应力的大小的改变称为激励，则该测量系统在该激励下产生响应，该响应包括稳态响应和瞬态响应，其中瞬态响应的强度随时间不断减小。在利用该测量系统测量光学固化胶的弹光系数时，瞬态响应会使测量产生误差，故需要保持恒压一段时间，使瞬态响应的强度减小，以减小瞬态响应对测量结果的影响，提高测量结果的准确性，且保持恒压的时间越长，测量结果越准确。
S403、该光信号单元产生初始光信号，通过该传导光纤将该初始光信号传输至该光学固化胶，获取该光学固化胶在不同稳态压应力作用下反射的干涉光信号，并传输给该处理单元。
该光信号单元包括：光源单元和光纤耦合器。
则，步骤S403具体包括：
该光源单元产生初始光信号，并将该初始光信号传输至该光纤耦合器。
该光纤耦合器将该光源单元传输的该初始光信号传输至该传导光纤。
该传导光纤将该光纤耦合器传输的该初始光信号传输至该光学固化胶，获取该光学固化胶在该稳态压应力组的作用下反射的干涉光信号，并将该干涉光信号传输给该光纤耦合器。
该光纤耦合器将该传导光纤传输的该干涉光信号，传输至该处理单元。
S404、该处理单元对该光信号单元传输的该干涉光信号进行处理，得到该光学固化胶在不同稳态压应力作用下的弹光系数，并将该弹光系数传输给该储存单元。
该处理单元还包括：光谱采集单元。
该运算控制单元包括：运算单元和储存单元。
则步骤S404的实现过程如下：
该光谱采集单元对该光纤耦合器传输的该干涉光信号进行处理，得到该运算单元可以处理的干涉光谱，并将该干涉光谱传输至该储存单元。
具体的，该光谱采集单元将该光纤耦合器传输的干涉光信号，转化为频域内连续的干涉光谱，该连续的干涉光谱横坐标为波长，纵坐标为功率谱密度。然后根据预设的采样波长间隔对该连续的干涉光谱进行采样，得到频域内离散的干涉光谱，该离散的干涉光谱为功率谱密度向量，该功率谱密度向量即为运算单元可以处理的干涉光谱。该光谱采集单元将该功率谱密度向量传输至储存单元。
该储存单元还储存有该光谱采集单元的采样波长间隔。
该储存单元将该光谱采集单元传输的干涉光谱，传输至该运算单元。
该运算单元对由该储存单元获得的干涉光谱进行寻峰扫描，得到在每个稳 态压应力下预设极小值处的波长，并将该预设极小值处的波长传输给储存单元。
具体的，该寻峰扫描的实现过程为，运算单元在预设范围内对该储存单元传输的功率谱密度向量进行最小值搜索，得到最小的功率谱密度，并读取该最小的功率谱密度对应的向量序号，并根据该向量序号和储存在该储存单元中的采样波长间隔得到该最小的功率谱密度对应的波长，该最小的功率谱密度即为该预设极小值，该最小功率谱密度对应的波长，即为该预设极小值处的波长。故通过单次寻峰扫描可以获得一个稳态压应力的作用下，该预设极小值处的波长。
在光学固化胶受到的稳态压应力发生变化时，光学固化胶反射的干涉光信号发生改变，则该光谱采集单元获得的功率谱密度向量也发生改变，该功率谱密度向量的序号同时增大或同时减小相同的数值，但功率谱密度的大小不发生变化，即该功率谱密度向量发生漂移，该序号的改变量称为漂移量。该最小的功率谱密度对应的向量序号发生改变，即该预设极小值处的波长发生变化。故通过实时寻峰扫描可获得每个稳态压应力的作用下，该预设极小值处的波长。
运算单元将该每个稳态压应力的作用下，该预设极小值处的波长，传输至储存单元，该储存单元将该预设极小值处的波长以向量的形式按顺序储存，该顺序与该稳态压应力组中稳态压应力的排列顺序相同。
该储存单元，还储存有系数数据，该系数数据包括：该稳态压应力组的大小变化范围、变化步长和保持恒压的时间以及该光学固化胶的弹性模量、泊松比、原始厚度和原始折射率，还储存有计算光学固化胶的弹光系数的递推公式，该储存单元将该系数数据、该递推公式和由该运算单元获得的该预设极小值处的波长传输给运算单元。
具体的，为方便光学固化胶的弹光系数的计算，稳态压应力组的变化步长为常数，稳态压应力组中每个稳态压应力的大小以向量的形式储存在该储存单元中。
可选的，该储存单元包括系数数据输出接口，可从外部获得系数数据，并可对储存的系数数据进行修改。
该运算单元根据由该储存单元获得的该系数数据和该预设极小值处的波长，并根据由该储存单元获得的递推公式：
Figure PCTCN2017110138-appb-000001
运算得到每个稳态压应力下，该光学固化胶的弹光系数，式(1)中T(σN)为在大小为σN的该稳态压应力的作用下该光学固化胶的弹光系数，m为正整数，σN为在该稳态压应力组中第N个稳态压应力的大小，σN-1为在该稳态压应力组中第N-1个稳态压应力的大小，λ(σN-1)为在大小为σN-1的该稳态压应力的作用下该预设极小值处的波长，Δλ(σN)为在大小为σN的该稳态压应力的作用下该预设极小值处的波长的变化量，L(σN-1)为在大小为σN-1的该稳态压应力的作用下该光学固化胶的厚度，ΔL(σN)为在大小为σN的该稳态压应力的作用下该光学固化胶的厚度的变化量，n(σN-1)为在大小为σN-1的该稳态压应力的作用下该光学固化胶的折射率，Δσ为该预设变化步长。
其中，σN-1与σN的关系为：σN＝σN-1+Δσ。
m为常数，该系数数据还包括m的大小。
需要说明的是，光学固化胶和传导光纤形成光纤法布里-珀罗干涉仪，对于该干涉仪，干涉极小值处的波长，即最小的功率谱密度对应的波长，的表达式为：
Figure PCTCN2017110138-appb-000002
式(2)中，λ(σN)在大小为σN的该稳态压应力的作用下，该干涉极小值处的波长，n(σN)在大小为σN的该稳态压应力的作用下光学固化胶的折射率，L(σN)为在大小为σN的该稳态压应力的作用下光学固化胶的厚度。
将式(2)进行差分：
Figure PCTCN2017110138-appb-000003
为了简化计算，使稳态压应力组中预设变化步长Δσ为很小的值，使稳态压应力大小的变化使光学固化胶产生的厚度变化量和折射率的变化量均为很小的值，进而使式(3)中的
Figure PCTCN2017110138-appb-000004
项的值小到对计算结果的影响可忽略，且Δσ越小，该项对计算结果的影响越小，测量结果越精确。但Δσ也不能过小，Δσ过小时，预设极小值处的波长的变化量Δλ(σN)小于光谱采集单元的最小采样波长间隔，该光谱采集单元无法感应到预设极小值处的波长的变化，致使测量产生误差。
为了使光谱采集单元可以完全获得预设极小值处的波长的变化信息，根据采样定理，Δσ应使预设极小值处的波长的变化量的最小值大于该光谱采集单元的采样波长间隔的两倍。
忽略式(3)中的
Figure PCTCN2017110138-appb-000005
项后得到：
Figure PCTCN2017110138-appb-000006
由式(4)可以得到Δn(σN)的计算公式：
Figure PCTCN2017110138-appb-000007
将式(5)中等号的左右两边同时除以稳态压应力组中预设变化步长Δσ，即 可得到弹光系数的递推公式(1)。
L(σN-1)和ΔL(σN)可根据光学固化胶的原始长度和弹性模量计算得到。
具体的，为便于说明，以下以应力与应变的关系为线性进行说明，并非对光学固化胶的应力与应变的关系进行限定，根据光学固化胶的特性和所受应力的大小，应力与应变的关系还可以为非线性关系。
应力与应变的关系为：
Figure PCTCN2017110138-appb-000008
式(6)中ξ(σN-1)为在大小为σN-1的该稳态压应力的作用下该光学固化胶产生的应变，E为该光学固化胶的弹性模量。
根据应变的定义有：
Figure PCTCN2017110138-appb-000009
将式(6)带入式(7)中，有：
Figure PCTCN2017110138-appb-000010
根据式(8)即可计算得L(σN-1)，式(8)中，L为光学固化胶的原始厚度，即光学固化胶未受到稳态压应力作用时的厚度。
ΔL(σN-1)的计算公式为：
ΔL(σN-1)＝L(σN)-L(σN-1)   (9)
式(9)中L(σN)可根据式(8)算出。
n(σN-1)可根据递推公式(1)和初始条件：光学固化胶的原始折射率n，迭代得到。
进一步地，该光源单元为宽带光源单元，用于产生多个不同波长的初始光信号。
则，在得到在每个稳态压应力下预设极小值处的波长中，该预设极小值处 的波长包括多组在每个稳态压应力下预设极小值处的波长。
需要说明的是，光学固化胶具有第一反射面和第二反射面，初始光信号经过该第一反射面反射得到第一反射光信号，初始光信号经过该第二反射面反射得到第二反射光信号，该第一反射光信号和该第二反射光信号的波长相同，相位不同，第一反射光信号和第二反射光信号发生干涉，形成干涉光信号。多个不同波长的初始光信号经过光学固化胶反射后，产生的第一反射光信号和第二反射光信号的相位差不同，得到多组不同的干涉光信号，每个波长的初始光信号对应一组干涉光信号。
该多组不同的干涉光信号传输至光谱采集单元后，分别将每组连续的干涉光信号转为频域上离散的干涉光谱，并将每组干涉光谱分别按顺序以向量的形式传输至储存单元，储存单元将这些向量以矩阵的形式储存，每个波长的初始光信号对应一组向量。
该储存单元将该矩阵传输至运算单元，该运算单元按该向量的方向对该矩阵进行寻峰扫描，搜索到每个向量中的最小值对应的序号，并根据该序号得到每个最小值对应的波长，这些波长即为在一个稳态压应力的作用下，多个极小值处的波长。
当稳态压应力的大小发生改变时，这些向量发生漂移，对这些向量进行实时寻峰扫描即可得到该多组在每个稳态压应力下预设极小值处的波长。每个波长的初始光信号对应一组在每个稳态压应力下预设极小值处的波长。
该运算单元，根据由该储存单元获得的该系数数据和该预设极小值处的波长，并根据由该储存单元获得的递推公式(1)运算得到每个稳态压应力下，该光学固化胶的弹光系数中，
该运算单元，根据由该储存单元获得的该系数数据和多组该预设极小值处的波长，并根据由该储存单元获得的递推公式(1)运算得到不同波长的该初始光信号处，每个稳态压应力下，该光学固化胶的弹光系数。
本实施例提供的测量方法，第一方面，由于通过传导光纤将初始光信号传输至光学固化胶，故对入射光的空间位置和角度的要求低，光路调节简单。第二方面，运算控制单元，控制压应力发生单元产生的稳态压应力组，使该稳态压应力组的变化步长保持不变，故简化了弹光系数的计算。第三方面，同时得到光学固化胶在不同稳态压应力的作用下和在不同初始光信号的波长处的弹光系数，故测量效率高。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其它实施例的相关描述。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者系统不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者系统所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者系统中还存在另外的相同要素。
本领域技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明，任何熟悉本专业的技术人员，在不脱离本发明技术方案范围内，当可利用上述揭示的技术内容做出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案内容，依据本发明的技术实质对以上实施例所作的任何简单修改、 等同变化与修饰，均仍属于本发明技术方案的范围内。

Claims (10)

  1. 一种测量系统，用于测量光学固化胶的弹光系数，其特征在于，所述测量系统包括：光信号传输单元、处理单元和压应力发生单元；
    所述光信号传输单元包括：光信号单元和传导光纤，所述光信号单元通过传导光纤与所述光学固化胶连接，所述处理单元与所述光信号单元连接，所述压应力发生单元与所述处理单元连接；
    所述处理单元，用于产生控制信号，将所述控制信号传输至所述压应力发生单元，所述控制信号用于控制所述压应力发生单元对所述光学固化胶施加预设的稳态压应力组；
    所述光信号单元，用于产生初始光信号，将所述初始光信号通过所述传导光纤传输至所述光学固化胶，并将所述光学固化胶在不同稳态压应力作用下反射的干涉光信号传输至所述处理单元；
    所述处理单元，还用于处理由所述光信号单元获得的干涉光信号，以得到所述光学固化胶在不同稳态压应力作用下的弹光系数。
  2. 如权利要求1所述的测量系统，其特征在于，所述光信号单元包括：
    光源单元和光纤耦合器；
    所述光纤耦合器包括：第一接口、第二接口和第三接口；
    所述光源单元通过所述第一接口与所述光纤耦合器连接；
    所述光纤耦合器通过所述第二接口与所述传导光纤的一端连接；
    所述光学固化胶固化在所述传导光纤的另一端；
    所述处理单元通过所述第三接口与所述光纤耦合器连接；
    所述光源单元，用于产生初始光信号并通过所述第一接口将所述初始光信号传递至所述光纤耦合器；
    所述光纤耦合器，用于将由所述第一接口获得的初始光信号，通过所述第 二接口传递至传导光纤；
    所述传导光纤，用于将由所述第二接口获得的初始光信号传输至所述光学固化胶，并将所述光学固化胶在不同稳态压应力作用下反射的干涉光信号通过所述第二接口传输至所述光纤耦合器；
    所述光纤耦合器，还用于将由所述第二接口获得的干涉光信号，通过所述第三接口传输至所述处理单元。
  3. 如权利要求2所述测量系统，其特征在于，所述处理单元包括：光谱采集单元和运算控制单元；
    所述光谱采集单元包括数据输出接口；
    所述运算控制单元包括信号输出接口；
    所述光谱采集单元通过所述第三接口与所述光纤耦合器连接；
    所述光谱采集单元通过所述数据输出接口与所述运算控制单元连接；
    所述运算控制单元通过所述信号输出接口与所述压应力发生单元连接；
    所述运算控制单元，用于产生所述控制信号，并通过所述信号输出接口将所述控制信号传输至所述压应力发生单元，以使所述压应力发生单元对所述光学固化胶施加预设大小变化范围、预设变化步长和预设恒压保持时间的所述稳态压应力组；
    所述光纤耦合器，还用于通过所述第三接口，将在不同所述稳态压应力的作用下所述光学固化胶反射的干涉光信号传输至所述光谱采集单元；
    所述光谱采集单元，用于将由所述第三接口获得的干涉光信号转化为所述运算控制单元可处理的干涉光谱，并通过所述数据输入接口将所述干涉光谱传输至所述运算控制单元；
    所述运算控制单元，还用于根据由所述数据接口获得的所述干涉光谱和储存于所述运算控制单元中的预设的数据及运算关系，计算得所述光学固化胶的弹光系数；
    所述稳态压应力的大小变化范围中所述范围的最小值为零，最大值不超过所述光学固化胶的屈服极限。
  4. 如权利要求3所述的测量系统，其特征在于，所述运算控制单元包括：运算单元和储存单元；
    所述光谱采集单元通过所述数据输出接口与所述储存单元连接；
    所述储存单元与所述运算单元连接；
    所述运算单元通过所述信号输出接口与所述压应力发生单元连接；
    所述储存单元，用于存储系数数据、运算关系以及由所述数据输出接口获得的干涉光谱；
    所述运算单元，用于产生控制信号，并通过所述信号输出接口，将所述控制信号传输至所述压应力发生单元，以使所述压应力发生单元对所述光学固化胶施加预设大小变化范围、预设变化步长和预设恒压保持时间的所述稳态压应力组；
    所述运算单元，还用于利用所述系数数据和运算关系对所述存储单元中存储的所述干涉光谱进行处理，得到每个稳态压应力下所述干涉光谱的预设干涉极小值处的波长以及不同稳态压应力作用下所述光学固化胶的弹光系数；
    所述运算单元，还用于将处理得到的所述预设干涉极小值处的波长以及不同稳态压应力作用下所述光学固化胶的弹光系数传输至所述储存单元中存储。
  5. 如权利要求2所述的测量系统，其特征在于，所述光源单元为宽带光源单元，用于产生多个不同波长的所述初始光信号。
  6. 一种测量方法，其特征在于，利用测量系统测量得到光学固化胶的弹光系数，其中所述测量系统包括：光信号传输单元、处理单元和压应力发生单元，所述光信号传输单元包括光信号单元和传导光纤，所述测量方法包括：
    所述处理单元产生控制信号，并将所述控制信号传输至所述压应力发生单元；
    所述压应力发生单元响应于所述控制信号，对所述光学固化胶施加预设的稳态压应力组；
    所述光信号单元，产生初始光信号，通过所述传导光纤将所述初始光信号传输至所述光学固化胶，获取所述光学固化胶在不同稳态压应力作用下反射的干涉光信号，并传输给所述处理单元；
    所述处理单元，对所述光信号单元传输的所述干涉光信号进行处理，得到所述光学固化胶在不同稳态压应力作用下的弹光系数，并将所述弹光系数传输给所述储存单元。
  7. 如权利要求6所述的测量方法，其特征在于，所述处理单元包括：运算控制单元；
    则，所述处理单元产生控制信号，并将所述控制信号传输至所述压应力发生单元，具体包括：
    所述运算控制单元根据预设的所述光学固化胶的弹性模量和泊松比，产生控制信号，并将所述控制信号传输至所述压应力发生单元；
    所述压应力发生单元响应于所述控制信号对所述光学固化胶施加预设的稳态压应力组，具体包括：
    所述压应力发生单元响应于所述控制信号，对所述光学固化胶施加预设数值范围和预设变化步长的稳态压应力组，其中所述数值范围的最小值为零，最大值不超过所述光学固化胶的屈服极限。
  8. 如权利要求7所述的测量方法，其特征在于，所述光信号单元包括：
    光源单元和光纤耦合器；
    则，所述光信号单元产生初始光信号，通过所述传导光纤将所述初始光信号传输至所述光学固化胶，获取所述光学固化胶在不同稳态压应力作用下反射的干涉光信号，并传输给所述处理单元，具体包括：
    所述光源单元产生初始光信号，并将所述初始光信号输至所述光纤耦合器；
    所述光纤耦合器将所述光源单元传输的所述初始光信号传输至所述传导光纤；
    所述传导光纤将所述光纤耦合器传输的所述初始光信号传输至所述光学固化胶，获取所述光学固化胶在所述稳态压应力组的作用下反射的干涉光信号，并将所述干涉光信号传输给所述光纤耦合器；
    所述光纤耦合器将所述传导光纤传输的所述干涉光信号，传输至所述处理单元。
  9. 如权利要求8所述的测量方法，其特征在于，所述处理单元还包括：光谱采集单元；
    所述运算控制单元包括运算单元和储存单元；
    则，所述处理单元对所述光信号单元传输的所述干涉光信号进行处理，得到所述光学固化胶在不同稳态压应力作用下的弹光系数，具体包括：
    所述光谱采集单元对所述光纤耦合器传输的所述干涉光信号进行处理，得到所述运算单元可以处理的干涉光谱，并将所述干涉光谱传输至所述储存单元；
    所述储存单元将所述光谱采集单元传输的所述干涉光谱，传输至所述运算单元；
    所述运算单元对所述储存单元传输的所述干涉光谱进行寻峰扫描，得到在每个稳态压应力下预设极小值处的波长，并将所述预设极小值处的波长传输给所述储存单元；
    所述储存单元还储存有系数数据，该系数数据包括：所述稳态压应力组的大小变化范围、变化步长和保持恒压的时间以及所述光学固化胶的弹性模量、泊松比、原始厚度和原始折射率，还储存有计算弹光系数的递推公式，所述储存单元将所述系数数据、所述运算关系和由所述运算单元获得的所述预设极小值处的波长传输给运算单元；
    所述运算单元根据所述储存单元传输的所述系数数据和所述预设极小值处 的波长，并根据所述储存单元传输的所述递推公式：
    Figure PCTCN2017110138-appb-100001
    得到每个稳态压应力下，所述光学固化胶的弹光系数，并将所述弹光系数传输给所述储存单元；
    式(1)中T(σN)为在大小为σN的所述稳态压应力的作用下所述光学固化胶的弹光系数，m为正整数，σN为所述稳态压应力组中第N个稳态压应力的大小，σN-1为所述稳态压应力组中第N-1个稳态压应力的大小，λ(σN-1)为在大小为σN-1的所述稳态压应力的作用下所述预设极小值处的波长，Δλ(σN)为在大小为σN的所述稳态压应力的作用下所述预波长的变化量，L(σN-1)为在大小为σN-1的所述稳态压应力的作用下所述光学固化胶的厚度，ΔL(σN)为在大小为σN的所述稳态压应力的作用下所述光学固化胶的厚度的变化量，n(σN-1)为在大小为σN-1的所述稳态压应力的作用下所述光学固化胶的折射率，Δσ为所述预设变化步长；
    所述L(σN-1)和ΔL(σN)可根据所述光学固化胶的原始长度和弹性模量计算得到；
    所述n(σN-1)可根据所述递推公式(1)和初始条件：所述光学固化胶的原始折射率n递推得到。
  10. 如权利要求9所述的测量方法，其特征在于，所述光源为宽带光源单元，产生多个不同波长的所述初始光信号；
    则，所述得到在每个稳态压应力下预设极小值处的波长中，所述预设极小值处的波长包括多组在每个稳态压应力下预设极小值处的波长；
    所述运算单元根据所述储存单元传输的所述系数数据和所述预设极小值处的波长，并根据所述储存单元传输的递推公式(1)得到每个稳态压应力下，所述光学固化胶的弹光系数中，
    所述运算单元根据所述储存单元传输的所述系数数据和多组所述预设极小 值处的波长，并根据所述储存单元传输的所述递推公式(1)得到不同波长的所述初始光信号处，每个稳态压应力下，所述光学固化胶的弹光系数。
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