CN116027480B - Angle-selective polymer optical panel for reflective detection and preparation method thereof - Google Patents
Angle-selective polymer optical panel for reflective detection and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an angle selective polymer optical panel for reflective detection and a preparation method thereof, wherein the preparation method comprises the following steps: preparing a light shielding fiber multifilament yarn, preparing an angle-selective optical fiber microstructured rod, preparing an angle-selective polymer optical panel: the light shielding fiber multifilament, the angle-selected optical fiber microstructural rod and the light shielding fiber are structurally arranged in a plate arranging die according to a certain structural design, the arranged blank plates are put into a hot pressing die, and then the blank plates are put into a vacuum hot pressing furnace for vacuum melting, so that the angle-selected polymer optical blank plates are obtained; and carrying out optical cold processing on the angle selective polymer optical blank plate after hot press molding to obtain the angle selective polymer optical panel with preset thickness. The angle selective polymer optical panel solves the problem that a large amount of disordered optical signals are mutually crosstalked when light emitted by the light emitter passes through body tissues, and improves imaging quality and high-sensitivity response.
Description
Technical Field
The invention relates to the technical field of optical panel production, in particular to an angle-selective polymer optical panel for reflective detection and a preparation method thereof.
Background
With the development and advancement of society, health has been increasingly concerned, and non-invasive, painless detection techniques have been developed, optical Coherence Tomography (OCT) is a new technique for performing high resolution cross-sectional imaging, which can provide cross-sectional images of micro-scale tissue structures in situ and in real time. OCT is an optical biopsy, a powerful medical diagnostic imaging technique because, unlike traditional histopathology, which requires removal of tissue specimens and microscopic examination procedures, OCT can provide in situ and real-time tissue images, can be used in situations where standard resections are dangerous or impossible, to reduce sampling errors associated with resections, and to guide interventional procedures.
The principle of OCT technology is to project a beam onto the tissue or specimen being imaged, the beam being reflected by microstructures at different distances. The time delay of the reflected light and the intensity of the reflected light are measured, reflection information obtained by measuring at different positions is converted into a digital signal, and the digital signal is converted into a two-dimensional and three-dimensional image form through computer processing, so that the microstructure of each layer of the imaged tissue is displayed. However, when the light beam emitted by the light emitter inside the instrument irradiates the inside of the tissue, because the reflection and absorption of the light on the skin surface are very complex, the phenomenon of light crosstalk occurs, a great amount of irregular scattering can be generated, the trajectory or serpentine photons of the reflected light signal follow the Snell law, and the generated diffuse photons lose directivity due to Mie scattering of the turbid tissue medium, so that the light signal received by the light sensor is greatly disturbed, the noise is large, the measurement precision and the sensitivity are very low, the finally formed image is further disturbed, the image generates fog, and the definition of the image is greatly affected.
Disclosure of Invention
It is a primary object of the present invention to provide an angle selective polymer optical panel for reflective detection that improves imaging quality and high sensitivity response.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method of making an angle selective polymer optical panel for reflective detection, comprising the steps of:
preparing a light shielding fiber multifilament yarn:
(1) Preparing a light shielding material prefabricated rod from the light shielding material, and drawing the light shielding material prefabricated rod into a light shielding fiber monofilament by adopting an optical fiber drawing machine;
(2) Taking a plurality of light shielding fiber monofilaments, discharging a regular hexagon fiber array plate in a regular hexagon plate discharging mold, binding and fixing two ends to form a light shielding fiber multifilament rod, and drawing the light shielding fiber multifilament rod into a light shielding fiber multifilament through an optical fiber drawing machine;
preparing an optical fiber microstructure bar with a selected angle:
(1) Preparing a light guide material prefabricated rod from a light guide material, and drawing the light guide material prefabricated rod into a light guide fiber monofilament by adopting an optical fiber drawing machine;
(2) Tightly arranging the optical fiber monofilaments in a hexagonal array die in a hexagonal stacking manner to form an optical fiber bundle, placing the optical fiber bundle into a forming cavity of a hot-melt die, placing the hot-melt die into a vacuum hot-press furnace, and applying pressure in a preset direction to polymerize the optical fiber bundle to form an optical fiber microstructure array rod;
(3) Obliquely cutting the optical fiber microstructure array rod at a certain angle to obtain an optical fiber microstructure array rod with an inclined angle, and then processing the optical fiber microstructure array rod with the inclined angle into a column body to obtain an optical fiber microstructure rod with a selected angle;
preparing an angle selective polymer optical panel:
(1) The light shielding fiber multifilament, the angle-selected optical fiber microstructural rod and the light shielding fiber are structurally arranged in a plate arranging die according to a certain structural design, the arranged blank plates are put into a hot pressing die, and then the blank plates are put into a vacuum hot pressing furnace for vacuum melting, so that the angle-selected polymer optical blank plates are obtained;
(2) Performing optical cold processing on the angle selective polymer optical blank plate after hot press molding to obtain an angle selective polymer optical panel with preset thickness;
the certain structural design comprises at least more than 2 angle-selected optical fiber microstructure rods to be placed, the sizes of the angle-selected optical fiber microstructure rods are correspondingly adjusted according to the sizes of the light shielding fiber multifilament, and the angle-selected optical fiber microstructure rods are arranged at intervals.
Further, the method further comprises the following steps:
preparing light shielding filament inserting fiber:
cutting a light shielding material prefabricated rod into a regular hexagonal prism, polishing the regular hexagonal prism to form a light shielding plug wire prefabricated rod, and drawing the light shielding plug wire prefabricated rod into light shielding plug wire fibers with a preset size through an optical fiber drawing machine;
the light shielding material is arranged in the gaps around the angle-selected optical fiber microstructure rod, and the shape of the light shielding fiber inserting fiber is correspondingly adjusted according to the shape changes of the angle-selected optical fiber microstructure rod and the light shielding fiber multifilament. If the light shielding material and the angularly selected optical fiber microstructure rods have no gaps during the alignment process, no light shielding fiber plug is required.
The certain structure is designed as follows: discharging the light shielding fiber multifilament from a regular hexagon fiber array plate in a regular hexagon plate discharging mold, arranging 9 light shielding fiber multifilament on each side, symmetrically arranging two angle-selected optical fiber microstructure rods at the middle of the regular hexagon, and filling gaps between the angle-selected optical fiber microstructure rods and the light shielding fiber multifilament around each angle-selected optical fiber microstructure rod by using the light shielding fiber plug; and the central lines of the two angle-selected optical fiber microstructure rods are provided with three light shielding fiber multifilament yarns and two light shielding fiber inserting yarns.
The light guide material is a polymer optical fiber with a core-skin structure;
the light shielding material is an opaque dark polymer material, and the light shielding material has a transmittance of less than or equal to 8% for light rays of 400nm-1200 nm.
The light guide material and the light shielding material are thermoplastic polymer materials, the temperature difference of glass transition temperatures Tg of the light guide material and the light shielding material is less than or equal to 30 ℃, and the saturated water absorption rate of the polymer materials is less than 0.5%.
The difference percentage of the thermal expansion coefficient of the light guide material and the thermal expansion coefficient of the light shielding material is less than or equal to 30%;
the core material of the light guide material is selected from one of polymethyl methacrylate Polymethyl Methacrylate, PMMA, polycarbonate, PC, polystyrene, PS and cycloolefin copolymer TOPAS, and the skin material of the light guide material is fluororesin; the light guide material is of a polymer optical fiber structure; the light shielding material is obtained by adding substances into the core material in the light guide material to dye the core material so as to change the core material from transparent to dark color.
Further, the light shielding material preform is drawn into a light shielding fiber monofilament with a drawing temperature of 120-260 ℃, a feeding speed of 3-8mm/min, a drawing speed of 1-12r/min, and a diameter of 0.8-5.0mm.
The opposite sides of the light shielding fiber multifilament rod are 18-50mm, the drawing temperature of drawing the light shielding fiber multifilament rod into a light shielding fiber multifilament is 110-250 ℃, the feeding speed is 3-10mm/min, the drawing speed is 3-10r/min, and the opposite sides of the light shielding fiber multifilament rod are 0.5-2.5mm;
drawing the light guide material preform into a light guide fiber monofilament with a drawing temperature of 120-250 ℃, a feeding speed of 3-8mm/min and a drawing speed of 1-12r/min, wherein the diameter of the light guide fiber monofilament is 0.4-1mm;
the light shielding fiber is drawn at 120-260 ℃, the feeding speed is 3-6mm/min, and the drawing speed is 3-15r/min;
the light guide fiber bundle is put into a vacuum hot pressing furnace, the hot pressing temperature is 150-320 ℃, the hot pressing pressure is 0.2-1.2MPa, and the hot pressing time is 10 minutes-6 hours;
the hot pressing temperature of the angle selection polymer optical blank plate is 150-350 ℃, the hot pressing pressure is 0.2-1.5MPa, and the hot pressing time is 10 minutes-12 hours.
The diameter of the angle-selected optical fiber microstructure rod is 1.15-5.77mm, the angle-selected optical fiber microstructure rod is used as an incident light area and a reflecting light area window in the polymer optical panel, the inclination angle of the angle-selected optical fiber microstructure rod of the incident light area is +/-90 degrees, and the inclination angle of the angle-selected optical fiber microstructure rod of the reflecting light area is minus 90 degrees to minus 90 degrees;
The optical fiber microstructure bar with the angle selection is round, regular polygon or rectangle, and consists of one or more optical fiber microstructure bars.
The invention also provides an angle-selective polymer optical panel for reflective detection, which is prepared according to the preparation method.
By means of the technical scheme, the invention has at least the following advantages:
according to the invention, the polymer optical panel is selected by arranging the optical fiber array structure and adding the light shielding fiber inserting to prepare the angle, the optical fiber can be subjected to modularized structural arrangement design, so that the optical fiber can be maximally adapted to market requirements of different equipment devices, and simultaneously, gaps in the plate arrangement process can be effectively eliminated, and further, the transverse deformation of the optical fiber can be reduced in the hot pressing process, so that the relative positions of a plurality of light guide fiber array areas can be maintained unchanged more easily and accurately after hot pressing, and high-precision positioning forming is realized.
The invention can effectively filter the random diffuse reflection reflected back from turbid media such as human tissues and the like by preparing the optical fiber array area with the angle selection light guide and selectively transmitting or blocking the light according to the incident angle of the reflected light, so that the detector can safely retain the optical signals with high precision, the in-band noise and low-frequency noise of the optical signals reflected back to the detector are obviously reduced, and the optical signals of the directed photons can effectively block the noise by using the angle selection polymer optical panel of the invention so as to be effectively collected in the acceptance angle.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a method of making an angle-selective polymer optical panel for reflectance detection according to an embodiment of the present invention;
FIGS. 2-4 are structural variations of a method for fabricating an angularly selected optical fiber microstructured rod according to embodiments of the present invention;
fig. 5 to 6 are structural change diagrams of a method for manufacturing a light shielding fiber plug according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of a structural design arrangement of an angle selective polymer optical blank provided in an embodiment of the present invention;
FIG. 8 is a schematic view of the structure of an angle selective polymer optical panel provided by an embodiment of the present invention;
FIG. 9 is a schematic view of a portion of an angle selective polymer optical panel for use within an instrument device according to an embodiment of the present invention.
FIG. 10 is a schematic illustration of a structural design arrangement of an angle selective polymer optical blank without the need for inserting light shielding filament fibers, in accordance with an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted for achieving the preset aim of the invention, the following detailed description refers to the specific implementation, structure, characteristics and effects of the invention with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
As shown in fig. 1, a method for preparing an angle-selective polymer optical panel for reflective detection includes the steps of:
preparing a light shielding fiber multifilament yarn:
(1) Preparing a light shielding material prefabricated rod from the light shielding material, and drawing the light shielding material prefabricated rod into a light shielding fiber monofilament by adopting an optical fiber drawing machine;
(2) Taking a plurality of light shielding fiber monofilaments, discharging a regular hexagon fiber array plate in a regular hexagon plate discharging mold, binding and fixing two ends to form a light shielding fiber multifilament rod, and drawing the light shielding fiber multifilament rod into a light shielding fiber multifilament through an optical fiber drawing machine;
preparing an optical fiber microstructure bar with a selected angle:
(1) Preparing a light guide material prefabricated rod from a light guide material, and drawing the light guide material prefabricated rod into a light guide fiber monofilament by adopting an optical fiber drawing machine;
(2) The fiber arranging machine is controlled by a high-precision grating ruler and a precision motor, fiber guiding filaments are closely arranged in a regular hexagon fiber arranging mould in a hexagonal stacking manner to form a fiber guiding bundle, the fiber guiding bundle is placed into a forming cavity of a hot melting pressing mould, then the hot melting pressing mould is placed into a vacuum hot pressing furnace, and pressure in a preset direction is applied to polymerize the fiber guiding bundle to form an optical fiber microstructure array rod;
(3) And obliquely cutting the optical fiber microstructure array rod at a certain angle through a linear cutting machine to obtain an optical fiber microstructure array rod with an inclined angle, and then processing the optical fiber microstructure array rod with the inclined angle into a column through machine tool equipment to obtain the optical fiber microstructure rod with the angle selection.
Preparing light shielding filament inserting fiber:
cutting a light shielding material prefabricated rod into a regular hexagonal prism, polishing the regular hexagonal prism to form a light shielding plug wire prefabricated rod, and drawing the light shielding plug wire prefabricated rod into light shielding plug wire fibers with a preset size through an optical fiber drawing machine;
the light shielding material is arranged in the gaps around the angle-selected optical fiber microstructure rod, and the shape of the light shielding fiber inserting fiber can be correspondingly adjusted according to the shape changes of the angle-selected optical fiber microstructure rod and the light shielding fiber multifilament;
Preparing an angle selective polymer optical panel:
(1) The light shielding fiber multifilament, the angle-selected optical fiber microstructural rod and the light shielding fiber are structurally arranged in a plate arranging die according to a certain structural design, the arranged blank plates are put into a hot pressing die, and then the blank plates are put into a vacuum hot pressing furnace for vacuum melting, so that the angle-selected polymer optical blank plates are obtained;
(2) Performing optical cold processing on the angle selective polymer optical blank plate after hot press molding to obtain an angle selective polymer optical panel with preset thickness;
the certain structural design comprises at least more than 2 angle-selected optical fiber microstructure rods to be placed, the sizes of the angle-selected optical fiber microstructure rods are correspondingly adjusted according to the sizes of the light shielding fiber multifilament, and the angle-selected optical fiber microstructure rods are arranged at intervals.
At least 2 angle-selective optical fiber microstructural rods are selected, because after the angle-selective polymer optical panel is manufactured, at least one incident light area of a light transmitting path of a light emitter and a reflected light area transmitted to a light sensor path along the incident light area through reflection of internal tissues of the light emitter can be correspondingly adjusted according to the size of the multifilament of the light shielding fiber, the optical fiber microstructural rods are arranged at intervals, the light shielding material is arranged around the optical fiber microstructural rods, the shape of the light shielding fiber can be correspondingly adjusted according to the shape changes of the angle-selective optical fiber microstructural rods and the light shielding fiber multifilament, and if no gap exists in the structural design of the row plate, the light shielding fiber can be not inserted.
The angle selective polymer optical panel for reflective detection solves the problem that a large amount of disordered optical signals are mutually crosstalked when light emitted by a light emitter passes through body tissues, reduces diffuse photons which are reflected by tissues and blood and lose directivity, has a controlled angle receiving angle for back scattered light in the body tissues, selectively transmits or blocks light propagation, reduces non-directional and unexpected emitted photons before reaching a light sensor, further reduces noise signals, improves the stability of received signal precision, and further improves imaging quality and high-sensitivity response.
Further, the light guide material is a polymer optical fiber with a core-skin structure;
the light shielding material is an opaque dark polymer material, and the light shielding material has a transmittance of less than or equal to 8% for light of 400nm-1200nm, and may be 4%, 3%, 2%, 1% or 0.
The light guide material and the light shielding material are thermoplastic polymer materials, the temperature difference of glass transition temperature Tg of the light guide material and the light shielding material is less than or equal to 30 ℃, the saturated water absorption of the polymer material is less than 0.5%, and the polymer material has excellent mechanical properties and can be used in a wire drawing process. If the difference between the glass transition temperatures Tg is too large, one material is easily melted and deformed in the wire drawing or hot pressing process, and other materials are not softened, so that the processing process is difficult.
The percentage difference between the coefficient of thermal expansion of the light guide material and the coefficient of thermal expansion of the light shielding material should be less than or equal to 30%.
The core material of the light guide material is selected from one of polymethyl methacrylate Polymethyl Methacrylate, PMMA, polycarbonate, PC, polystyrene, PS and cycloolefin copolymer TOPAS, and the skin material of the light guide material is fluororesin; the light guide material is of a polymer optical fiber structure; the light shielding material is obtained by adding substances into the core material in the light guide material to dye the core material so as to change the core material from transparent to dark color.
The molecular chain movement of the polymer material has strong dependence on temperature, when the temperature is lower than the glass transition temperature Tg, the movement of the polymer chain segment is frozen, the thermal expansion coefficient is smaller, when the temperature is higher than the glass transition temperature Tg, the movement of the chain segment is accelerated, the molecular chain is expanded along with the diffusion movement of the chain segment, and the volume expansion is macroscopically generated. If the difference between the coefficients of thermal expansion of the light guide material and the light shielding material is large, a large pressing force is likely to be generated inside the bar during the hot pressing process, thereby causing cracking or bending of the bar inside.
Further, the light shielding material preform is drawn into a light shielding fiber monofilament with a drawing temperature of 120-260 ℃, a feeding speed of 3-8mm/min, a drawing speed of 1-12r/min, and a diameter of 0.8-5.0mm.
The method comprises the steps of binding light shielding fiber monofilaments through a row bar to obtain a regular hexagon light shielding fiber multifilament bar, wherein the opposite sides of the light shielding fiber multifilament bar are 18-50mm, drawing temperature of the light shielding fiber multifilament bar drawn into a light shielding fiber multifilament is 110-250 ℃, feeding speed is 3-10mm/min, drawing speed is 3-10r/min, and the opposite sides of the light shielding fiber multifilament are 0.5-2.5mm;
drawing the light guide material preform into a light guide fiber monofilament with the drawing temperature of 120-250 ℃, the feeding speed of 3-8mm/min and the drawing speed of 1-12r/min, wherein the diameter of the light guide fiber monofilament is 0.4-1mm;
the light shielding plug wire prefabricated rod is formed by cutting and polishing a light shielding material prefabricated rod in a regular hexagonal prism shape through machine tool equipment, wherein the wire drawing temperature of the light shielding plug wire fiber is 120-260 ℃, the feeding speed is 3-6mm/min, and the wire drawing speed is 3-15r/min;
orderly arranging the optical fiber monofilaments in a regular hexagon wire arranging die to form an optical fiber bundle, then placing the optical fiber bundle into the die, and placing the optical fiber bundle into a vacuum hot pressing furnace for hot pressing to form an optical fiber microstructure array rod, wherein the hot pressing temperature is 150-320 ℃, the hot pressing pressure is 0.2-1.2MPa, and the hot pressing time is 10 minutes-6 hours;
The hot pressing temperature of the angle selection polymer optical blank plate is 150-350 ℃, the hot pressing pressure is 0.2-1.5MPa, and the hot pressing time is 10 minutes-12 hours.
The optical fiber microstructure array rod with the inclined angle is formed by cutting the optical fiber microstructure array rod in the same direction and at the same angle through a wire cutting machine, and finally the optical fiber microstructure array rod with the diameter of 1.15-5.77mm is manufactured, wherein the angle-selected optical fiber microstructure rod is used as an incident light area and a reflecting light area window in a polymer optical panel, the inclined angle of the angle-selected optical fiber microstructure rod of the incident light area is +/-90 degrees, and the inclined angle of the angle-selected optical fiber microstructure rod of the reflecting light area is-90 degrees;
the shape of the optical fiber microstructure bar with the angle selection can be round, regular polygon or rectangle, and can be composed of one or more pieces.
According to the required angle of the optical fiber microstructure array rod, corresponding cutting can be performed by adjusting the cutting placement position of the optical fiber microstructure array rod or mobilizing the position of a cutting tool. The inclination angle is 0 ° in the X-axis direction and 90 ° in the Y-axis direction, for example: and (3) obliquely cutting the optical fiber microstructure array rod with the cutting angle of 60 degrees, horizontally placing the cut optical fiber microstructure array rod, forming an included angle of 30 degrees with the X-axis direction of a tabletop, rounding the optical fiber microstructure array rod into a cylinder, and obtaining the optical fiber microstructure rod with the angle of-30 degrees if the cylinder is turned upside down, wherein the angle of the optical fiber microstructure array rod is 30 degrees. The optical fiber microstructure bar with the angle of +/-90 degrees is directly rounded into a cylinder without oblique cutting after hot pressing, namely 90 degrees is perpendicular to the X-axis direction, and the angle is minus 90 degrees after the optical fiber microstructure bar with the angle of +/-90 degrees is inverted up and down.
The angle-selected optical fiber microstructure rod can be further drawn into an angle-selected optical fiber microstructure rod with smaller size and containing more light-guiding optical fiber monofilaments through an optical fiber drawing machine.
Referring to fig. 2-4, process flow diagrams of a method of preparing an angularly selected optical fiber microstructured rod are shown.
Firstly, the optical fiber microstructure array rod 110 is cut obliquely along the cutting line 1, then the optical fiber microstructure array rod 111 with the inclination angle obtained after cutting is placed horizontally, at this time, in the horizontal direction, the unit optical fiber wires in the optical fiber microstructure array rod are inclined at a certain angle, then the optical fiber microstructure array rod with the inclination angle is cut and rounded into a cylinder through machine tool equipment, and finally the optical fiber microstructure rod 112 with the angle selection is obtained.
Referring to fig. 5 and 6, a process flow diagram of a method of manufacturing a light-shielding filament fiber is that first, a longitudinal arc cut is made at an arc of 60 ° and through two opposite apexes of the same side of a light-shielding material preform 120 shaped as a regular hexagonal prism, and then the cut light-shielding filament preform is drawn into a light-shielding filament fiber 121 by an optical fiber drawing machine, the h-dimension of the light-shielding filament fiber 121 being one half of the length of opposite sides of the light-shielding filament multifilament. Specifically 0.25-1.25mm.
The purpose of the light shielding filament fibers is to fill the gap between the angularly selected fiber microstructural rod and the light shielding fiber multifilament yarn, if no gap is present in the structural design, the light shielding filament fibers need not be prepared. For example, when the shape and the size of the optical fiber microstructure bar selected by the design angle are the same as those of the light shielding fiber multifilament, no gaps exist due to the tight arrangement, and the preparation of the light shielding fiber is not needed. When the shape and the size of the optical fiber microstructure bar and the light shielding fiber multifilament have gaps in the arrangement process, the corresponding light shielding fiber plug is prepared according to the shape of the gaps, and the gaps of the two materials of the optical fiber microstructure bar and the light shielding fiber multifilament with angle selection in the graphic design are filled.
As shown in fig. 7, one structural design of the present invention: the angle-selective polymer optical blank 130 is composed of angle-selective optical fiber microstructured bars 112, light shielding fiber multifilament 131, light shielding filament inserting fibers 121, the angle-selective optical fiber microstructured bars 112 being composed of a plurality of micron-sized polymer optical fiber arrays.
Specifically, the light shielding fiber multifilament 131 is discharged from a regular hexagon fiber array plate in a regular hexagon plate discharge mold, 9 light shielding fiber multifilament 131 are arranged on each side, two angle-selected optical fiber microstructure rods 112 are symmetrically arranged at the middle position of the regular hexagon, and the periphery of each angle-selected optical fiber microstructure rod 112 is filled with gaps between the angle-selected optical fiber microstructure rods 112 and the light shielding fiber multifilament 131 by using light shielding fiber inserting 131; three light shielding fiber multifilaments 131 and two light shielding filament inserting fibers 112 are provided on the center lines of the two angle-selected optical fiber microstructured bars 112. The resulting angle-selective polymer optical panel as shown in fig. 8, the angle-selective polymer optical panel 140 includes a light shielding region 141, an incident light region 142, and a reflected light region 143, each of the incident light region 142 and the reflected light region 143 for passing a light beam.
As shown in fig. 8 and 9, the angle selective polymer optical panel of the present invention works on the principle of inside the instrument device: the light beam emitted by the light emitter 152 passes through the incident light region 142 of the angle-selective polymer optical panel 140, enters the human tissue 150, a portion of the light beam is absorbed by the human tissue, a portion of the light beam is reflected, and the reflected light passes through the reflected light region 143 into the light sensor 151. The incident light zone 142 is composed of a plurality of optical fiber monofilaments perpendicular to the direction of the angle-selective polymer optical panel 140, and the reflected light zone 143 is composed of an optical fiber microstructure rod with angle selection, so that all effective light signals in the angle can be effectively received, stray light signals outside the angle are blocked, and the problem of crosstalk between the light signals is further avoided.
The angle selective polymer optical panel of the present invention includes a light shielding region and a light guiding fiber array region having an oblique angle. The angle selective polymer optical panel exhibits a controlled angular acceptance of backscattered light in human tissue according to Snell's law, thereby reducing non-directional and unwanted noise signals before reaching the light sensor. By precisely controlling the angle of the light guiding array structure, the directional light signals can be effectively collected in the receiving angle, and the imaging quality and the high-sensitivity response are further improved.
The invention is further illustrated by the following examples:
example 1
A method of making an angle selective polymer optical panel for reflective detection, comprising the steps of:
preparing a light shielding fiber multifilament yarn:
the light guide material is a light guide fiber with a core-skin structure formed by taking polymethyl methacrylate (PMMA) as a core material and taking fluororesin as a skin material.
The light shielding material is a dark opaque material prepared by using polymethyl methacrylate (PMMA) as a base material and adding black master batch for dyeing.
(1) Preparing a light shielding material prefabricated rod from the light shielding material, and drawing the light shielding material prefabricated rod into a light shielding fiber monofilament by adopting an optical fiber drawing machine; the drawing temperature is 180 ℃, the feeding speed is 6mm/min, the drawing speed is 7r/min, and the diameter of the light shielding fiber monofilament is 1.25mm.
(2) Taking a plurality of light shielding fiber monofilaments, discharging a regular hexagon fiber array plate in a regular hexagon plate discharging mold, binding and fixing two ends to form a light shielding fiber multifilament rod, and drawing the light shielding fiber multifilament rod into a light shielding fiber multifilament through an optical fiber drawing machine; drawing the light shielding fiber multifilament rod into a light shielding fiber multifilament with the opposite side of 27.4mm, wherein the drawing temperature of the light shielding fiber multifilament rod is 175 ℃, the feeding speed is 5mm/min, the drawing speed is 3r/min, and the opposite side of the light shielding fiber multifilament rod is 1.8mm;
Preparing an optical fiber microstructure bar with a selected angle:
(1) Preparing a light guide material prefabricated rod from a light guide material, and drawing the light guide material prefabricated rod into a light guide fiber monofilament by adopting an optical fiber drawing machine; the wire drawing temperature is 190 ℃, the feeding speed is 6mm/min, the wire drawing speed is 8r/min, and the diameter of the optical fiber monofilament is 0.5mm;
(2) The fiber arranging machine is controlled by a high-precision grating ruler and a precise motor, fiber guiding monofilaments are closely arranged in a regular hexagon fiber arranging mold in a hexagonal stacking manner to form fiber guiding bundles, the fiber guiding bundles are placed into a forming cavity of a hot melting pressing mold, then the hot melting pressing mold is placed into a vacuum hot pressing furnace, the hot pressing temperature is 220 ℃, the hot pressing pressure is 0.3MPa, and the hot pressing time is 1 hour, so that the fiber guiding bundles are polymerized to form an optical fiber microstructure array rod;
(3) Two optical fiber microstructural bars with angle selection are respectively prepared, wherein one optical fiber microstructural bar is used as a window of an incident light area, and the other optical fiber microstructural bar is used as a window of a reflection light area: obliquely cutting one optical fiber microstructure array rod at an angle of 60 degrees by a wire cutting machine, and then inverting the cut optical fiber microstructure array rod up and down to obtain an optical fiber microstructure array rod with an inclination angle of-30 degrees, and then processing the optical fiber microstructure array rod with the inclination angle into a cylinder by a machine tool device to obtain an optical fiber microstructure rod with a diameter of 4.15mm and an angle selection as a reflected light area window; and another optical fiber microstructure array rod is directly processed into an optical fiber microstructure rod with the diameter of 4.15mm by machine tool equipment, and the optical fiber microstructure array rod does not need to be obliquely cut, and the angle is 90 degrees and is used as a window of an incident light area.
The optical fiber microstructure array rod with the inclined angle is formed by cutting the optical fiber microstructure array rod in the same direction and at the same angle through a wire cutting machine, and finally the optical fiber microstructure array rod with the diameter of 4.15mm is manufactured into an angle-selected optical fiber microstructure rod, wherein the angle-selected optical fiber microstructure rod is used as an incident light area and a reflecting light area window in a polymer optical panel, the inclined angle of the angle-selected optical fiber microstructure rod of the incident light area is 90 DEG, and the inclined angle of the angle-selected optical fiber microstructure rod of the reflecting light area is-30 DEG;
preparing light shielding filament inserting fiber:
cutting a light shielding material prefabricated rod into a regular hexagonal prism, polishing the regular hexagonal prism to obtain a light shielding plug wire prefabricated rod, and drawing the light shielding plug wire prefabricated rod into a light shielding plug wire fiber with the size h of 0.9mm through an optical fiber drawing machine; the light shielding fiber is drawn at 180 ℃, the feeding speed is 6mm/min, and the drawing speed is 4r/min;
the light shielding fiber is arranged in the gaps around the angle-selected optical fiber microstructure rod, and the shape of the light shielding fiber can be correspondingly adjusted according to the shape changes of the angle-selected optical fiber microstructure rod and the light shielding fiber multifilament; the adjusted light-shielding filament-inserting fiber can completely fill the gap between the periphery of the optical fiber microstructure bar with the selected angle and the light-shielding fiber multifilament.
Preparing an angle selective polymer optical panel:
(1) Arranging the light shielding fiber multifilament, the angle-selected optical fiber microstructural rod and the light shielding fiber in a row plate die according to a certain structural design, putting the blank plate after arrangement into a hot pressing die, and then putting the blank plate into a vacuum hot pressing furnace for vacuum melting, wherein the hot pressing temperature is 235 ℃, the hot pressing pressure is 0.6MPa, and the hot pressing time is 2 hours, so as to obtain the angle-selected polymer optical blank plate;
(2) Performing optical cold processing on the angle selective polymer optical blank plate after hot press molding to obtain an angle selective polymer optical panel with preset thickness;
the certain structural design comprises 2 angle-selected optical fiber microstructural rods, the sizes of the angle-selected optical fiber microstructural rods are correspondingly adjusted according to the sizes of the light shielding fiber multifilament, and when the angle-selected optical fiber microstructural rods are arranged, the angle-selected optical fiber microstructural rods are arranged at intervals.
Example 2
The preparation method is basically the same as that of the examples, except that:
the light guide material is a light guide fiber with a core-sheath structure formed by taking Polycarbonate (PC) as a core material and taking fluororesin as a sheath material.
The light shielding material is a dark opaque material prepared by using Polycarbonate (PC) as a base material and adding black master batch for dyeing.
Drawing the light shielding material preform into a light shielding fiber monofilament, wherein the drawing temperature of the light shielding fiber monofilament is 200 ℃, the feeding speed is 5.5mm/min, the drawing speed is 7.8r/min, and the diameter of the light shielding fiber monofilament is 1mm.
The method comprises the steps of binding light shielding fiber monofilaments through a row bar to obtain a regular hexagon light shielding fiber multifilament bar, wherein the opposite sides of the light shielding fiber multifilament bar are 30.6mm, the drawing temperature of the light shielding fiber multifilament bar drawn into the light shielding fiber multifilament is 195 ℃, the feeding speed is 4mm/min, the drawing speed is 3.5r/min, and the opposite sides of the light shielding fiber multifilament are 1.5mm;
drawing a light guide material preform into a light guide fiber monofilament, wherein the drawing temperature of the light guide fiber monofilament is 203 ℃, the feeding speed is 5mm/min, the drawing speed is 11r/min, and the diameter of the light guide fiber monofilament is 0.45mm;
the light shielding plug wire prefabricated rod is formed by cutting and polishing a light shielding material prefabricated rod with a regular hexagonal prism shape through machine tool equipment, the wire drawing temperature of the light shielding plug wire fiber is 200 ℃, the feeding speed is 5mm/min, the wire drawing speed is 5.8r/min, and the size h of the light shielding plug wire fiber is 0.75mm;
And (3) neatly arranging the optical fiber monofilaments in a regular hexagon wire arranging die to form an optical fiber bundle, then placing the optical fiber bundle into the die, and placing the optical fiber bundle into a vacuum hot pressing furnace for hot pressing to form an optical fiber microstructure array rod, wherein the hot pressing temperature is 230 ℃, the hot pressing pressure is 0.35MPa, and the hot pressing time is 80 minutes, so that the optical fiber bundle is polymerized to form the optical fiber microstructure array rod.
The hot pressing temperature of the angle selection polymer optical blank plate is 243 ℃, the hot pressing pressure is 0.68MPa, and the hot pressing time is 77 minutes.
The optical fiber microstructure array rod with the inclined angle is formed by cutting the optical fiber microstructure array rod in the same direction and at the same angle through a wire cutting machine, and finally the optical fiber microstructure array rod with the diameter of 3.46mm is manufactured, wherein the optical fiber microstructure rod with the angle selection is used as an incident light area and a reflecting light area window in a polymer optical panel, the inclined angle of the optical fiber microstructure rod with the angle selection of the incident light area is 90 DEG, and the inclined angle of the optical fiber microstructure rod with the angle selection of the reflecting light area is-90 DEG;
the shape of the angle-selected optical fiber microstructure rod is round.
Example 3
The preparation method is basically the same as that of the examples, except that:
the light guide material is a light guide fiber with a core-skin structure formed by taking polymethyl methacrylate (PMMA) as a core material and taking fluororesin as a skin material.
The light shielding material is a dark opaque material prepared by using polymethyl methacrylate (PMMA) as a base material and adding black master batch for dyeing.
The preparation method is basically the same as that of the examples, except that:
drawing the light shielding material preform into a light shielding fiber monofilament, wherein the drawing temperature of the light shielding fiber monofilament is 180 ℃, the feeding speed is 5.5m/min, the drawing speed is 6.5r/min, and the diameter of the light shielding fiber monofilament is 1.4mm.
The method comprises the steps of binding light shielding fiber monofilaments through a row bar to obtain a regular hexagon light shielding fiber multifilament bar, wherein the opposite sides of the light shielding fiber multifilament bar are 35.5mm, the drawing temperature of the light shielding fiber multifilament bar drawn into the light shielding fiber multifilament is 177 ℃, the feeding speed is 6.3mm/min, the drawing speed is 4.7r/min, and the opposite sides of the light shielding fiber multifilament are 1.2mm;
drawing a light guide material preform into a light guide fiber monofilament, wherein the drawing temperature of the light guide fiber monofilament is 191 ℃, the feeding speed is 7mm/min, the drawing speed is 5.5r/min, and the diameter of the light guide fiber monofilament is 0.6mm;
Orderly arranging the optical fiber monofilaments in a regular hexagon wire arranging die to form an optical fiber bundle, then placing the optical fiber bundle into the die, and placing the optical fiber bundle into a vacuum hot pressing furnace for hot pressing to form an optical fiber microstructure array rod, wherein the hot pressing temperature is 218 ℃, the hot pressing pressure is 0.33MPa, and the hot pressing time is 48 minutes, so that the optical fiber bundle is polymerized to form the optical fiber microstructure array rod;
the hot-pressing temperature of the angle selective polymer optical blank plate is 235 ℃, the hot-pressing pressure is 0.62MPa, and the hot-pressing time is 110 minutes, so that the angle selective polymer optical blank plate is obtained.
The optical fiber microstructure array rod with the inclined angle is formed by cutting and then drawing the optical fiber microstructure array rod in the same direction and at the same angle through a wire cutting machine, and finally processing the optical fiber microstructure array rod into an optical fiber microstructure rod with the opposite side of 1.2mm and the angle of which is selected from a regular hexagon, wherein the angle of the optical fiber microstructure rod is selected as an incident light area and a reflecting light area window in a polymer optical panel, the inclined angle of the optical fiber microstructure rod with the angle of the incident light area is +/-90 degrees, and the inclined angle of the optical fiber microstructure rod with the angle of the reflecting light area is +/-90 degrees;
Referring to fig. 10, in order to schematically arrange the structural design of the angle-selective polymer optical blank without inserting the light-shielding filament-inserting fibers, an angle-selective polymer optical blank 160 of embodiment 3 is composed of angle-selective optical fiber microstructure rods 161 and light-shielding fiber multifilaments 162.
The optical fiber microstructure bar 161 with the angle selection is regular hexagon, the reflected light area window and the incident light area window are respectively composed of 7 optical fiber microstructure bars 161 with the angle selection of regular hexagon, and the optical fiber microstructure bars 161 with the angle selection are consistent with the shape and the size of the light shielding fiber multifilament 162, so that no gap exists in the arrangement process, and the light shielding fiber is not required to be inserted.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (10)
1. A method of making an angle selective polymer optical panel for reflective detection comprising the steps of:
preparing a light shielding fiber multifilament yarn:
(1) Preparing a light shielding material prefabricated rod from the light shielding material, and drawing the light shielding material prefabricated rod into a light shielding fiber monofilament by adopting an optical fiber drawing machine;
(2) Taking a plurality of light shielding fiber monofilaments, discharging a regular hexagon fiber array plate in a regular hexagon plate discharging mold, binding and fixing two ends to form a light shielding fiber multifilament rod, and drawing the light shielding fiber multifilament rod into a light shielding fiber multifilament through an optical fiber drawing machine;
preparing an optical fiber microstructure bar with a selected angle:
(1) Preparing a light guide material prefabricated rod from a light guide material, and drawing the light guide material prefabricated rod into a light guide fiber monofilament by adopting an optical fiber drawing machine;
(2) Tightly arranging the optical fiber monofilaments in a hexagonal array die in a hexagonal stacking manner to form an optical fiber bundle, placing the optical fiber bundle into a forming cavity of a hot-melt die, placing the hot-melt die into a vacuum hot-press furnace, and applying pressure in a preset direction to polymerize the optical fiber bundle to form an optical fiber microstructure array rod;
(3) Obliquely cutting the optical fiber microstructure array rod at a certain angle to obtain an optical fiber microstructure array rod with an inclined angle, and then processing the optical fiber microstructure array rod with the inclined angle into a column body to obtain an optical fiber microstructure rod with a selected angle;
preparing an angle selective polymer optical panel:
(1) The light shielding fiber multifilament, the angle-selected optical fiber microstructural rod and the light shielding fiber are structurally arranged in a plate arranging die according to a certain structural design, the arranged blank plates are put into a hot pressing die, and then the blank plates are put into a vacuum hot pressing furnace for vacuum melting, so that the angle-selected polymer optical blank plates are obtained;
(2) Performing optical cold processing on the angle selective polymer optical blank plate after hot press molding to obtain an angle selective polymer optical panel with preset thickness;
the certain structural design comprises at least 2 optical fiber microstructure rods with angle selection, wherein the sizes of the optical fiber microstructure rods with angle selection are correspondingly adjusted according to the sizes of the light shielding fiber multifilament, and the optical fiber microstructure rods with angle selection are arranged at intervals.
2. The method of manufacturing an angle-selective polymer optical panel for reflectance detection according to claim 1, further comprising:
Preparing light shielding filament inserting fiber:
cutting a light shielding material prefabricated rod into a regular hexagonal prism, polishing the regular hexagonal prism to form a light shielding plug wire prefabricated rod, and drawing the light shielding plug wire prefabricated rod into light shielding plug wire fibers with a preset size through an optical fiber drawing machine;
the light shielding material is arranged in the gaps around the angle-selected optical fiber microstructure rod, and the shape of the light shielding fiber inserting fiber is correspondingly adjusted according to the shape changes of the angle-selected optical fiber microstructure rod and the light shielding fiber multifilament.
3. The method of claim 2, wherein the structure is designed to: discharging the light shielding fiber multifilament from a regular hexagon fiber array plate in a regular hexagon plate discharging mold, arranging 9 light shielding fiber multifilament on each side, symmetrically arranging two angle-selected optical fiber microstructure rods at the middle of the regular hexagon, and filling gaps between the angle-selected optical fiber microstructure rods and the light shielding fiber multifilament around each angle-selected optical fiber microstructure rod by using the light shielding fiber plug; and three light shielding fiber multifilaments and two light shielding fiber inserting fibers are arranged between the two angle-selected optical fiber microstructure rods along the central line direction of the two angle-selected optical fiber microstructure rods.
4. A method of manufacturing an angle-selective polymer optical panel for reflectance detection according to any one of claims 1 to 3, wherein said light guiding material is a polymer optical fiber having a core-sheath structure;
the light shielding material is an opaque dark polymer material, and the light shielding material has a transmittance of less than or equal to 8% for light rays of 400nm-1200 nm.
5. The method of manufacturing an angle selective polymer optical panel for reflective inspection according to claim 4, wherein the light guiding material and the light shielding material are thermoplastic polymer materials, the difference in glass transition temperature Tg of the light guiding material and the light shielding material is less than or equal to 30 ℃, and the saturated water absorption of the polymer material is less than 0.5%.
6. The method of manufacturing an angle-selective polymer optical panel for reflective inspection according to claim 5, wherein the percentage difference between the coefficient of thermal expansion of the light guiding material and the coefficient of thermal expansion of the light shielding material is 30% or less;
the core material of the light guide material is selected from one of polymethyl methacrylate, polycarbonate, polystyrene and cycloolefin copolymer, and the skin material of the light guide material is fluororesin; the light guide material is of a polymer optical fiber structure; the light shielding material is obtained by adding substances into the core material in the light guide material to dye the core material so as to change the core material from transparent to dark color.
7. The method for manufacturing an angle-selective polymer optical panel for reflection type inspection according to claim 6, wherein the drawing temperature of drawing the light shielding material preform into a light shielding fiber monofilament is 120-260 ℃, the feeding speed is 3-8mm/min, the drawing speed is 1-12r/min, and the diameter of the light shielding fiber monofilament is 0.8-5.0mm;
the distance between two opposite sides of the light shielding fiber multifilament rod is 18-50mm, the drawing temperature of drawing the light shielding fiber multifilament rod into a light shielding fiber multifilament is 110-250 ℃, the feeding speed is 3-10mm/min, the drawing speed is 3-10r/min, and the distance between two opposite sides of the light shielding fiber multifilament is 0.5-2.5mm;
drawing the light guide material preform into a light guide fiber monofilament with a drawing temperature of 120-250 ℃, a feeding speed of 3-8mm/min and a drawing speed of 1-12r/min, wherein the diameter of the light guide fiber monofilament is 0.4-1mm;
the light shielding fiber is drawn at 120-260 deg.c, feeding speed of 3-6mm/min and drawing speed of 3-15r/min.
8. The method for manufacturing an angle-selective polymer optical panel for reflection type inspection according to claim 6, wherein the hot pressing temperature of the light-guiding fiber bundle placed in the vacuum hot pressing furnace is 150-320 ℃, the hot pressing pressure is 0.2-1.2MPa, and the hot pressing time is 10 minutes-6 hours;
The hot pressing temperature of the angle selection polymer optical blank plate is 150-350 ℃, the hot pressing pressure is 0.2-1.5MPa, and the hot pressing time is 10 minutes-12 hours.
9. The method of claim 6, wherein the cross-sectional shape of the angle-selective optical fiber microstructure rod is circular, regular polygon or rectangle, and the diameter of the angle-selective optical fiber microstructure rod is 1.15-5.77mm when the cross-sectional shape of the angle-selective optical fiber microstructure rod is circular, the angle-selective optical fiber microstructure rod is used as an incident light area and a reflected light area window in the polymer optical panel, the angle of inclination of the angle-selective optical fiber microstructure rod in the incident light area is + -90 degrees, and the angle of inclination of the angle-selective optical fiber microstructure rod in the reflected light area is-90- + -90 degrees.
10. An angle-selective polymer optical panel for reflectance detection, prepared according to the method of any one of claims 1-9.
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