A testing device for optical glue curing shrinkage

Abstract

The utility model discloses a testing device for the curing shrinkage rate of optical glue, which belongs to the field of optical measurement technology. It includes a light source, a light detection device, and a first light path and a second light path arranged between the light source and the light detection device, wherein the light emitted by the light source enters the first light path through the reflection of the first beam splitter prism, enters the second beam splitter prism through the side of the object-carrying device with the optical glue layer, and is output to the light detection device through the second beam splitter prism; the light emitted by the light source enters the second light path through the transmission of the first beam splitter prism, enters the second beam splitter prism through the side of the object-carrying device without the optical glue layer, and is output to the light detection device after reflection from the second beam splitter prism. The purpose of the utility model is to provide a testing device for the curing shrinkage rate of optical glue in view of the problems existing in the prior art, which is used to measure the curing shrinkage rate of optical glue.

Description

Technical Field

[0001] The utility model belongs to the field of optical measurement, and in particular relates to a device for testing the shrinkage rate of optical glue. Background Art

[0002] Optical glue is a special glue whose main component is a polymer material. The molecular chains formed by this material are very long and can absorb and transfer light. These molecular chains can form a very flat interface on the surface of the optical component, so that the light beam can pass through this interface with very high efficiency. Optical glue is mainly used in the industrial field to manufacture high-precision optical components. These components can be lenses, reflectors, prisms, filters, etc. In addition, optical glue is also widely used in the medical, scientific and aviation fields.

[0003] Optical glue is a glue commonly used in the optical precision manufacturing industry. Many of its characteristics have a great impact on the precision of optical products, such as expansion coefficient, curing shrinkage, etc. How to accurately measure these parameters is particularly important for product design. However, there is no device for accurately measuring the parameters of optical glue in the current existing technology, making it difficult to test and measure specific parameters. Utility Model Content

[0004] The purpose of the utility model is to provide a testing device for the curing shrinkage rate of optical glue in view of the problems existing in the prior art, which is used to measure the curing shrinkage rate of the optical glue.

[0005] According to a part of the invention specification, there is provided a testing device for the curing shrinkage rate of an optical glue, comprising a light source, a light detection device, and a first light path and a second light path arranged between the light source and the light detection device, wherein light emitted by the light source enters the first light path via reflection from a first beam splitter prism, is incident on a second beam splitter prism through a side of a support device having an optical glue layer, and is output to the light detection device via the second beam splitter prism; light emitted by the light source enters the second light path via transmission from the first beam splitter prism, is incident on a side of a support device having no optical glue layer, and is output to the light detection device via reflection from the second beam splitter prism.

[0006] Furthermore, the two beams of light emitted by the light source are received by the light detection device through the device, generating interference fringes. The center fringes are marked before the optical glue is cured, and the shrinkage rate of the glue can be obtained by observing the movement level of the center fringes after curing.

[0007] In the above technical solution, the parallel beam emitted by the laser beam vertically enters the first beam splitter prism and passes through its semi-transparent and semi-reflective surface. The parallel beam is split into two, one of which passes through the semi-transparent and semi-reflective surface of the first beam splitter prism and directly passes through the first beam splitter prism; the other passes through the semi-transparent and semi-reflective surface of the first beam splitter prism and is reflected onto the total reflection surface of the first beam splitter prism, and then is reflected out of the beam splitter prism. The advantages of choosing a beam splitter prism as a beam splitting element are low cost, simple structure, ability to transmit optical energy of various bands, ability to obtain a unique spectrum line, and high energy utilization.

[0008] Furthermore, the first optical path is the optical path of the light emitted by the light source passing through the semi-transparent and semi-reflective surface and the total reflection surface of the first beam splitter prism, the object-carrying device, the optical glue layer, and the semi-transparent and semi-reflective surface of the second beam splitter prism, and then entering the optical detection device; the second optical path is the optical path of the light emitted by the light source passing through the semi-transparent and semi-reflective surface of the first beam splitter prism, the object-carrying device, the semi-transparent and semi-reflective surface and the total reflection surface of the second beam splitter prism, and then entering the optical detection device.

[0009] Furthermore, the light source may be a laser.

[0010] Furthermore, the light beam emitted by the light source is incident vertically onto the first beam splitter prism.

[0011] Furthermore, the first beam splitter prism and the second beam splitter prism are right-angled trapezoidal beam splitters of exactly the same shape and size, and the first beam splitter prism and the second beam splitter prism are placed in opposite directions and inverted to each other. When the light source is emitted, the light can be vertically incident on the two beam splitters placed in opposite directions and inverted to each other, and the light is split into two and finally converged into one light, which is convenient for subsequent observation of changes before and after the optical glue is cured.

[0012] Furthermore, the object-supporting device includes a first window panel, a second window panel, and a third window panel; the first window panel and the second window panel are respectively placed at two ends of the upper surface of the third window panel.

[0013] Optionally, the first window, the second window and the third window are transparent glass, and the first window and the second window are hexahedral transparent glass with exactly the same size, wherein the first window and the third window are separated by an optical glue layer. By controlling other factors except the target variable to remain unchanged, the interference of these factors on the results can be eliminated, the evaluation can be made more accurate, and the accuracy and reliability of the testing device can be improved.

[0014] Furthermore, the optical glue layer is parallel to the glue surfaces on both sides, which prevents the light of the first light path from being refracted by the inclined surface, resulting in the inability to subsequently converge into one light with the light of the second light path, so that the range of the light interference fringes formed by the light detection device becomes larger, resulting in errors in the experiment.

[0015] Optionally, the light detection device may use a charge coupled device (CCD) because it has the advantages of high detection accuracy and high-speed detection efficiency, and can accurately and quickly generate interference fringes when capturing the test light beam.

[0016] Optionally, the device can be operated in a dark dust-free environment to reduce the impact of other light sources on the test process and improve the accuracy of the test results.

[0017] As a further technical solution, before the glue solidifies, we can obtain a set of interference fringes on the light detection device, mark one of the fringes in the center area, and observe the movement distance of the marked fringes after the optical glue solidifies to obtain the change in the optical path difference before and after the optical glue solidifies, which can infer the change in the thickness of the optical glue.

[0018] The refractive index of the optical glue before curing is n1, the refractive index after curing is n2, the thickness before curing is H, and the thickness difference before and after curing is ΔH, that is, the calculation formula for the change in optical path difference is: ΔH×|n2- n1|.

[0019] If the movement order of the stripe is m and the wavelength of the light emitted by the laser is λ, the thickness difference before and after curing is calculated as follows:

[0020]

[0021] The formula for shrinkage is as follows:

[0022]

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The utility model controls the positions of the light source, the beam splitter, the window, and the light detection device to remain unchanged, and only changes the front and back curing factors of the optical glue. By controlling other factors except the target variable to remain unchanged, the interference of these factors on the results is eliminated, the evaluation is made more accurate, and the accuracy and reliability of the test device are improved.

[0025] (2) The parts used in the utility model have high measurement accuracy and are easy to implement. Through mutual cooperation, the effect of accurately measuring the curing rate of optical colloid can be achieved.

[0026] (3) The utility model is convenient to operate for measuring the curing rate of optical glue and saves time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the optical glue curing shrinkage test device of the utility model;

[0028] Figure numerals: ① light source; ② beam splitter prism 1; ③ semi-transparent and semi-reflective surface 1; ④ total reflection surface 1; ⑤ window sheet 1; ⑥ window sheet 2; ⑦ window sheet 3; ⑧ optical glue layer; ⑨ beam splitter prism 2; ⑩ semi-transparent and semi-reflective surface 2; ⑪ total reflection surface 2; ⑫ light detection device. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "parallel", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention / utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention / utility model. In addition, the terms "first", "second", etc., are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention / utility model, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention / utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "bonding" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention / utility model can be understood by specific circumstances.

[0032] like Figure 1, a testing device for the curing shrinkage rate of optical glue is constructed: a light source ①, a light detection device ⑫, and a first light path and a second light path arranged between the light source ① and the light detection device ⑫, wherein the light emitted by the light source ① enters the first light path through the reflection of the dichroic prism 1②, is incident on the dichroic prism 2⑨ through the side of the object-carrying device with the optical glue layer ⑧, and is output to the light detection device ⑫ through the dichroic prism 2⑨; the light emitted by the light source ① enters the second light path through the transmission of the dichroic prism 1②, is incident on the dichroic prism 2⑨ through the side of the object-carrying device without the optical glue layer ⑧, and is output to the light detection device ⑫ after being reflected by the dichroic prism 2⑨.

[0033] Furthermore, the light source ① may be a laser.

[0034] Furthermore, the light detection device ⑫ may adopt a charge coupled device (CCD).

[0035] The first optical path is the optical path of the light emitted by the light source ①, which passes through the semi-transparent and semi-reflective surface 1③ and the total reflection surface 1④ of the dichroic prism 1②, the object-carrying device, the optical glue layer ⑧, and the semi-transparent and semi-reflective surface 2⑩ of the dichroic prism 2⑨, and then enters the optical detection device ⑫; the second optical path is the optical path of the light emitted by the light source ①, which passes through the semi-transparent and semi-reflective surface 1③ of the dichroic prism 1②, the object-carrying device, the semi-transparent and semi-reflective surface 2⑩ of the dichroic prism 2⑨, and then enters the optical detection device ⑫.

[0036] The object-carrying device comprises window pieces 1⑤, 2⑥ and 3⑦; the window pieces 1⑤ and 2⑥ are respectively placed at two ends of the upper surface of the window piece 3⑦.

[0037] After the light emitted by the light source ① enters the first optical path, it is reflected by the semi-transparent and semi-reflective surface 1③ of the beam splitter prism 1② to the total reflection surface 1④, and then reflected through the window sheet 3⑦, the optical glue ⑧, and the window sheet 1⑤, and then through the semi-transparent and semi-reflective surface 2⑩ of the beam splitter prism 2⑨ to be output to the light detection device ⑫; after the light emitted by the light source ① enters the second optical path, it is incident on the beam splitter prism 2⑨ through the semi-transparent and semi-reflective surface 1③ of the beam splitter prism 1②, the window sheet 3⑦, and the window sheet 2⑥, and then reflected by the total reflection surface 2⑪ to be refracted by the semi-transparent and semi-reflective surface 2⑩, and then gathered together with the light of the first optical path, and output together to the light detection device ⑫, and the two beams of light interfere to generate interference fringes.

[0038] Before the optical glue ⑧ is cured, we can obtain a set of interference fringes on the light detection device ⑫, marking a certain fringe in the central area.

[0039] Use ultraviolet light to irradiate the optical glue⑧ to make it solidify. Observe the movement distance of the marked stripes after the optical glue⑧ is solidified to obtain the change in the optical path difference before and after the optical glue⑧ is solidified, and the change in the thickness of the optical glue⑧ can be inferred.

[0040] The refractive index of the optical glue⑧ before curing is n1, the refractive index after curing is n2, the thickness before curing is H, and the thickness difference before and after curing is ΔH, that is, the optical path difference changes to ΔH×|n2-n1|.

[0041] If the movement order of the stripes is m, and the wavelength of the light emitted by laser ① is λ, then the curing difference formula is:

[0042]

[0043] The shrinkage formula is:

[0044]

[0045] Moreover, since the optical glue ⑧ is relatively thin, the thickness change before and after curing is small, and the measurement accuracy of the thickness of the optical glue ⑧ is not required to be high, so the thickness of the optical glue ⑧ is ignored.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A testing device for the curing shrinkage of optical glue, characterized in that: include: A light source, a light detection device, and a first light path and a second light path arranged between the light source and the light detection device, wherein light emitted by the light source enters the first light path through reflection from a first beam splitter prism, enters the second beam splitter prism through a side of a support device with an optical glue layer, and is output to the light detection device through the second beam splitter prism; light emitted by the light source enters the second light path through transmission from the first beam splitter prism, enters the second beam splitter prism through a side of the support device without an optical glue layer, and is output to the light detection device after reflection from the second beam splitter prism.

2. The optical glue curing shrinkage test device according to claim 1, characterized in that: The light source includes a laser.

3. The optical glue curing shrinkage test device according to claim 1, characterized in that: The first optical path is the optical path of the light emitted by the light source passing through the semi-transparent and semi-reflective surface and the total reflection surface of the first beam splitter prism, the object-carrying device, the optical glue layer, and the semi-transparent and semi-reflective surface of the second beam splitter prism, and then entering the optical detection device; the second optical path is the optical path of the light emitted by the light source passing through the semi-transparent and semi-reflective surface of the first beam splitter prism, the object-carrying device, the semi-transparent and semi-reflective surface and the total reflection surface of the first beam splitter prism, and then entering the optical detection device.

4. The optical glue curing shrinkage test device according to claim 1, characterized in that: The first beam splitter prism and the second beam splitter prism are right-angle trapezoidal beam splitter prisms with completely identical shapes and sizes, but the first beam splitter prism and the second beam splitter prism are placed in opposite directions and are inverted to each other.

5. The optical glue curing shrinkage test device according to claim 1, characterized in that: The object-carrying device comprises a first window piece, a second window piece and a third window piece; the first window piece and the second window piece are respectively placed at two ends of the upper surface of the third window piece.

6. The optical glue curing shrinkage test device according to claim 5, characterized in that: The first window sheet, the second window sheet and the third window sheet are transparent glass.

7. The optical glue curing shrinkage test device according to claim 1, characterized in that: The optical glue layer is placed between the first window sheet and the third window sheet, and the adhesive surfaces on two opposite sides of the optical glue layer are parallel.

8. The optical glue curing shrinkage test device according to claim 1, characterized in that: The light detection device includes a charge coupled device CCD.

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