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GB/T 28609-2012: Optical functional films -- Polyethylene terephthalate (PET) -- Determination of birefringence
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Optical functional films -- Polyethylene terephthalate (PET) -- Determination of birefringence
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GB/T 28609-2012
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Basic data | Standard ID | GB/T 28609-2012 (GB/T28609-2012) | | Description (Translated English) | Optical functional films -- Polyethylene terephthalate (PET) -- Determination of birefringence | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G15 | | Classification of International Standard | 71.080.99 | | Word Count Estimation | 10,127 | | Adopted Standard | ASTM D4093-1995 (2005), NEQ | | Regulation (derived from) | National Standards Bulletin No. 13 of 2012 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the use of Sena Meng measurement polyethylene terephthalate (PET) film birefringence methods, including determination of principal strain direction and the phase delay of two parts. This standard applies to one-way or two-way stret | GB/T 28609-2012: Optical functional films -- Polyethylene terephthalate (PET) -- Determination of birefringence
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Optical functional films. Polyethylene terephthalate (PET). Determination of birefringence
ICS 71.080.99
G15
National Standards of People's Republic of China
Optically functional film
Polyethylene terephthalate (PET) film
A birefringence measuring method
Polyethyleneterephthalate (PET) -
Issued on. 2012-06-29
2012-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard reference method using redrafted ASTMD4093.1995 (Reapproved2005) (English) "transparent or translucent plastic
Birefringent material and residual strain photoelastic test methods "preparation, and ASTMD4093.1995 (Reapproved2005) consistency Cheng
Degree is not equivalent.
This standard ASTMD4093.1995 (Reapproved2005) The main differences are as follows.
--- ASTMD4093.1995 (Reapproved2005) in the phase delay film samples over compensation scale range only
6.1.4.3 in a simple introduction, in the optical path and then added a set value compensator, and no detailed instructions, and
This standard has been described in detail;
--- ASTMD4093.1995 (Reapproved2005) compensation method used, and used in this standard Saina Meng (Senarmont) spin
Rotation analyzer method;
--- ASTMD4093.1995 (Reapproved2005) using white light source, and this standard uses monochromatic light source;
--- ASTMD4093.1995 (Reapproved2005) in another test portion of the inner oblique incidence birefringence involves the use of the mark
Registration does not involve the in-plane birefringence;
--- ASTMD4093. in 1995 (Reapproved2005) on residual strain of this standard does not address.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee of the optical thin film materials function (SAC/TC431) centralized.
This standard was drafted. Hefei Lucky Technology Industry Co., Ltd, China Lucky Film Group Corporation, Lucky Film Co., Ltd. of Tianjin.
The main drafters of this standard. Jiaocong Xuan, INTO, Gao Qing, Li Aerospace, Liu province.
Introduction
Speed \u200b\u200bof light in a vacuum is c (3 × 108m/s), in a transparent medium speed is v, v is always less than c, the ratio referred to them
Refractive index that the refractive index n = c/v, isotropic material, the refractive index is a constant and the vibration direction of light propagation direction and irrelevant. Big
Most glass and plastic materials are isotropic in the absence of stress, the refractive index is the same in all directions. When isotropic material should be subject to
Occurs when the force or strain, it will have an anisotropic refractive index to have a direction, this time need to use the three principal refractive indices instead. refraction
The rate of change with the size of the strain is related to the refractive index of a transparent material if no strain occurs as n0, after a strain of three principal refractive index
ni suffered strain is a linear function.
ni-n0 = ΣAijSj
Where i = 1,2,3 denote three directions (by Cartesian coordinates X, Y, Z represents), ni represents a refractive index in the three directions, j = 1,2,3
And i represents the same three directions, Sj represents the strain generated in the three directions. In isotropic materials, the two constants A and B
Material that is the relationship between strain and the resulting stress anisotropy occurs between.
When i = j, Aij = A;
When when i ≠ j, Aij = B
PET film production process, after the setting by the biaxial stretching, the film plane is set to the XY plane, the film is considered in directions X and Y
Stress strain occurs, there is no strain in the Z direction.
When polarized light vertical line through the transparent material, the two main strains of the material located in the S1 and S2 This transparent material plane, the incident light
The polarization direction of S1 and S2 are inconsistent, this time will be split into two polarized rays respectively S1 and S2 strain direction vibration components, such as
v1 and v2 denote two velocity components, compared with the refractive index n1 = C/v1, n2 = C/v2, refractive index difference between the two beams is called the
Birefringent material.
Δδ = n1-n2 = (AB) × (S1-S2) = K × (S1-S2)
Difference in refractive index is proportional to the difference between the two principal strain, K called optical constant strain, it is a constant physical properties, reflecting the performance of the material. by
The two beams of light propagation velocity in two different components is no longer synchronized, when through the thickness t of material to form the optical path difference in the two different levels
S1 and S2 plane polarized light vibrating inside the line after the relative distance has generated through the material, known as delay (delay amount) R, R by the following formula
She said.
R = (n1-n2) × t = K × t × (S1-S2)
Where. t represents the thickness of the material.
Since Δδ = n1-n2 = R/t, so the birefringence can be expressed as the thickness of the material produced by the unit phase delay.
There are two purposes birefringence measurement.
1) identify the main strain of the film (ie, the main stress) direction;
2) to determine the size of the delay amount, then obtain the magnitude of birefringence.
Using polarized light optical interference, by measuring the optical path difference compensation method.
Sena Meng Compensation Law analyzer rotation corresponds to a wavelength of 180 ° phase delay.
When a bunch of vertically polarized light incident on the film, will be split into the main strain S1 and S2 direction vibration two beams of polarized light, the two beams
N1 and n2 the refractive index of the light and the main strain related.
n1-n0 = AS1 B (S1 S2)
n2-n0 = AS2 B (S1 S2)
Where. n0 is no refractive index when isotropic strain; A and B are constants associated with the material.
From the above formula can be drawn.
n1-n2 = (AB) × (S1-S2)
Refractive index (n1-n2) is birefringent Δδ.
Optically functional film
Polyethylene terephthalate (PET) film
A birefringence measuring method
1 Scope
This standard specifies the polyethylene terephthalate (PET) film birefringence measurement method using Sena Meng method should include determination of the main
Change direction and the phase delay of two parts.
This standard applies to one-way or two-way stretch technology manufacturing PET film, apply a stretch plastic film manufacturing process may also be other
use.
Note. This standard only relates to the film surface birefringence, the plane birefringence not considered.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Strain strain
Deformation generated per unit length, it is divided into the manufacturing process introduced by elastic strain permanent plastic strain and the presence of stress, both of which
Strain will produce strain birefringence.
2.2
The optical axis azimuth opticalorientation
Master sample and the sample should slow axis direction TD (film manufacturing equipment transmission direction is called MD direction and the direction perpendicular to MD
Called TD direction, that is, the angle between the web lateral) direction between.
2.3
Delay amount retardation
Light through the spacing between the two wavefront after birefringent material, also known as the relative amount of delay.
2.4
Birefringence birefringence
Anisotropic film refractive index, generally by mechanical or thermal strain generated, depending on the refractive index for the spread of the plane of polarization of the light beam orientation and
Direction, usually produced by the strain, and the crystal orientation of the material during manufacture of the anisotropic material. It can also be expressed as relative unit thickness
delay.
3 Test Equipment
3.1 micrometer or thickness gauge
Micrometer or thickness gauge, test accuracy of 1%.
3.2 Method Sena Meng polarimeter
Polarimeter system structure shown in Figure 1.
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