CN113789599A - Optical fiber sensing fabric for pulse and blood oxygen saturation detection and preparation method thereof - Google Patents
Optical fiber sensing fabric for pulse and blood oxygen saturation detection and preparation method thereof Download PDFInfo
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- CN113789599A CN113789599A CN202111053420.2A CN202111053420A CN113789599A CN 113789599 A CN113789599 A CN 113789599A CN 202111053420 A CN202111053420 A CN 202111053420A CN 113789599 A CN113789599 A CN 113789599A
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
- D03D15/547—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads with optical functions other than colour, e.g. comprising light-emitting fibres
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05C—EMBROIDERING; TUFTING
- D05C17/00—Embroidered or tufted products; Base fabrics specially adapted for embroidered work; Inserts for producing surface irregularities in embroidered products
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2403/00—Details of fabric structure established in the fabric forming process
- D10B2403/02—Cross-sectional features
- D10B2403/024—Fabric incorporating additional compounds
- D10B2403/0243—Fabric incorporating additional compounds enhancing functional properties
Abstract
The invention discloses an optical fiber sensing fabric for detecting pulse and blood oxygen saturation and a preparation method thereof. The invention forms optical fiber fabric by weaving a plurality of side light-emitting optical fibers with side light-emitting units, a plurality of side light-sensitive optical fibers with side light-sensitive units and common yarns, the side light-emitting optical fibers and the side light-sensitive optical fibers are alternately arranged, a light isolation area formed by the yarns is arranged between the side light-emitting optical fibers and the side light-sensitive optical fibers, and a plurality of side light-emitting and side light-sensitive units form a light-emitting and light-sensitive array on the surface of the fabric, thereby realizing the collection of light volume pulse waves of red light and infrared wave bands and the calculation of blood oxygen saturation. The polymer optical fiber is woven into the fabric as the yarn, compared with the silicon optical fiber, the flexibility of the fabric can be improved, and the polymer optical fiber is intrinsically safe, cannot be broken to hurt people, and improves the use safety.
Description
Technical Field
The invention relates to the field of pulse and blood oxygen saturation sensors, in particular to an optical fiber sensing fabric for pulse and blood oxygen saturation detection and a preparation method thereof.
Background
Social problems such as aging population, generalization of chronic diseases and youth prompt people to pay more urgent attention to their health conditions, and the demand of people on remote medical treatment, home health monitoring and the like is continuously increased, so that a market foundation is developed for the development of wearable health medical treatment. The wearable sensor is convenient for realizing real-time monitoring of human body information, and becomes the basis and important direction of development of the big health industry.
The traditional wearable sensor is mostly worn on a human body or clothes as clothes, and has the defects of large volume, uncomfortable wearing and the like. To achieve a true "wearable" sensor, a fabric-type sensor is a necessary choice, which is easy to integrate with the garment and comfortable to wear. However, the current commercial fabric-type sensor is extremely deficient, and the related technology needs to be researched. The optical fiber is compatible with the yarn in shape, can be perfectly fused with the fabric, has the advantages of high sensitivity, electromagnetic interference resistance, sweat corrosion resistance and the like, and has great potential value in the aspect of fabric type sensors.
The pulse and the blood oxygen saturation are important physical parameters of a human body, and are beneficial to evaluating the health conditions of the heart, the heart and the cerebral vessels, the blood pressure and the respiratory system. In the aspects of photoplethysmography and oxyhemoglobin saturation detection, the current commercial products adopt semiconductor devices to realize luminescence and light sensing, and the devices are difficult to combine with fabrics.
Disclosure of Invention
The invention provides an optical fiber sensing fabric for detecting pulse and blood oxygen saturation and a preparation method thereof, aiming at overcoming the defects in the prior art.
The invention relates to an optical fiber sensing fabric for detecting pulse and blood oxygen saturation, which is characterized in that a plurality of side light-emitting optical fibers with side light-emitting units, a plurality of side photosensitive optical fibers with side photosensitive units and common yarns form the optical fiber fabric in a weaving mode, the side light-emitting optical fibers and the side photosensitive optical fibers are alternately arranged, an optical isolation area formed by the yarns is arranged between the side light-emitting optical fibers and the side photosensitive optical fibers, and a plurality of side light-emitting and side photosensitive units form a light-emitting and light-sensing array on the surface of the fabric, so that the collection of red light and infrared wave band light volume pulse waves and the calculation of the blood oxygen saturation are realized.
The optical fiber sensing fabric is sequentially divided into an upper common fabric area, a functional fabric area and a lower common fabric area in the warp direction; the functional fabric area is sequentially divided into a front optical fiber fixing area, an optical fiber floating long line area and a rear optical fiber fixing area in the weft direction, 3 light-emitting optical fibers and 2 light-sensitive optical fibers are sequentially arranged in the optical fiber floating long line area along the warp direction, the light-emitting optical fibers are arranged on the outermost side, the light-emitting optical fibers and the light-sensitive optical fibers are alternately arranged, and light-blocking yarns are woven among the optical fibers.
The side light-emitting unit and the side light-sensing unit are divided into a slightly-bent convex structure and a side wall slotting structure from the appearance, wherein the slightly-bent convex structure is realized in a hot-pressing, weaving or embroidering mode, and the top of the slightly-bent convex is ground into a plane; the side wall slotting structure is realized through stamping, grinding and laser processing.
A preparation method of an optical fiber sensing fabric for detecting pulse and blood oxygen saturation is characterized by adopting a weaving preparation method, a knitting preparation method or an embroidery preparation method.
The weaving preparation method adopts plain, twill or satin fabric tissue, the side light-emitting optical fiber and the side photosensitive optical fiber are used as weft yarns, other yarns are inelastic, the side light-emitting unit of the side light-emitting optical fiber and the side photosensitive unit of the side photosensitive optical fiber float on the surface of the fabric in a floating and long line mode, non-transparent yarns with the diameter larger than that of the optical fibers are added between the side light-emitting optical fiber and the side photosensitive optical fiber to form an optical isolation region, and the yarns for optical isolation comprise twisted yarns and polymer fibers.
The knitting preparation method adopts a warp knitting weft insertion knitting mode, adopts a chaining and chaining warp flat fabric tissue, and adopts side light-emitting fibers and side light-sensitive fibers as weft liner yarns to be lined in the knitted fabric.
The embroidery preparation method is characterized in that side light-emitting optical fibers and side photosensitive optical fibers are sewn into an inelastic fabric in an embroidery mode, each optical fiber only forms a slightly-bent bulge on the front surface of the fabric, the slightly-bent bulges are arranged in an array mode to form a light-emitting area and a photosensitive area, and a light isolation area formed by embroidering black opaque yarns is arranged between the light-emitting area and the photosensitive area.
The invention has the following beneficial effects:
the polymer optical fiber is woven into the fabric as the yarn, compared with the silicon optical fiber, the flexibility of the fabric can be improved, and the polymer optical fiber is intrinsically safe, cannot be broken to hurt people, and improves the use safety. The developed optical fiber side light-emitting and side light-sensing structure with the micro-bent protrusions and the side wall grooves has high light-emitting and light-sensing efficiency, the signal to noise ratio of sensing signals is improved beneficially, and effective collection of photoplethysmography can be achieved under the condition that a small amount of optical fibers and low light source power are used. The collected pulse optical signals are transmitted in the fabric along the optical fibers, and even if the transmission path is long, the pulse optical signals cannot be interfered by external electromagnetic radiation. The prepared optical fiber fabric has good air permeability and heat dissipation, is good in wearing thermal comfort, and the selected polymer optical fiber has biocompatibility, cannot cause irritation to skin after being contacted with a human body for a long time, and has good contact comfort. The preparation of the optical fiber fabric adopts the existing textile equipment, the technological parameters are convenient to adjust, and the mass production is facilitated.
Drawings
FIG. 1 is a slightly curved raised structure formed by hot pressing;
FIG. 2 is a schematic view of a weave pattern to form a microbend bump structure;
FIG. 3 is an embroidery pattern forming slightly curved raised structures;
FIG. 4 is a view of a slightly curved raised structure after grinding and topping;
FIG. 5 is a side wall slot structure formed by stamping;
FIG. 6 is a schematic illustration of a milling process to form a sidewall trench structure;
FIG. 7 is a laser machining process for forming a sidewall trench structure;
FIG. 8 is a woven fiber pulse oximetry fabric structure of example 1;
FIG. 9(a) is a fingertip red pulse wave waveform of example 1;
FIG. 9(b) is a waveform of infrared light pulse wave of fingertip in example 1;
fig. 10 shows the structure of the warp-knitted fiber pulse oximetry fabric in example 2.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The optical fiber sensing fabric is sequentially divided into an upper common fabric area, a functional fabric area and a lower common fabric area in the warp direction; the functional fabric area is sequentially divided into a front optical fiber fixing area, an optical fiber floating long line area and a rear optical fiber fixing area in the weft direction, 3 light-emitting optical fibers and 2 light-sensitive optical fibers are sequentially arranged in the optical fiber floating long line area along the warp direction, the light-emitting optical fibers are arranged on the outermost side, the light-emitting optical fibers and the light-sensitive optical fibers are alternately arranged, and light-blocking yarns are woven among the optical fibers.
The side light-emitting and side light-sensing units are divided into a slightly-bent convex structure and a side wall slotting structure from the appearance, wherein the slightly-bent convex structure can be realized by hot pressing, weaving or embroidering, and the top of the slightly-bent convex can be ground into a plane; the side wall slotting structure can be realized through stamping, grinding and laser processing.
The method for forming the micro-bent convex structure in the hot pressing mode comprises the following steps: and (2) putting the polymer optical fiber into a mold with a micro-bending groove, heating the local part of the polymer optical fiber by using a hot air device, performing hot-pressing and fixing after the polymer optical fiber in a heating area is softened, and cooling to form a micro-bending convex structure. The outline of the slightly bent convex structure formed by the hot pressing mode is shown in the attached figure 1.
The method for forming the slightly-bent convex structure in the weaving mode comprises the following steps: the optical fiber is used as warp or weft by a weaving mode, and is used as weft or warp corresponding to the fiber with the diameter similar to that of the optical fiber and certain hardness, namely the optical fiber and the hard fiber are mutually vertical in the fabric, and the hard fiber can be metal fiber such as stainless steel, hard polymer fiber, metal fiber folded and twisted yarn, polymer fiber folded and twisted yarn and the like. With the proper weave and yarn density chosen, the optical fibers 4 will form microbend protrusion structures 5 at the intersections with the stiff fibers 6, the configuration of which is shown in fig. 2.
The method for forming the slightly-bent convex structure in the embroidery mode comprises the following steps: the optical fiber 4 is embroidered into the inelastic fabric 7 by using an embroidery machine or a manual embroidery mode as an embroidery yarn, and the thickness of the fabric is larger than the diameter of the optical fiber. Each optical fiber is embroidered into the fabric only once, and a slightly bent convex structure 5 can be formed on the front surface of the fabric, and the appearance of the slightly bent convex structure is shown in the attached figure 3.
In order to improve the luminous efficiency and the photosensitive efficiency, the top end of the slightly-bent convex structure is ground and ground. The abrasive tool may be a small grit sandpaper, and the ground, truncated microbend relief structure is shown in fig. 4.
The method for forming the side wall slotting structure in the stamping mode comprises the following steps: the polymer optical fiber is placed in a U-shaped groove of a metal mold and fixed, the metal mold with the V-shaped sawtooth structure is utilized to press the optical fiber from the upper part, a V-shaped groove can be stamped in the side wall of the polymer optical fiber, and the depth of the groove can be changed through the pressure. The profile is shown in figure 5.
The method for forming the side wall slotting structure in a grinding mode comprises the following steps: and the polymer optical fiber is placed in a U-shaped groove of a metal mold and fixed, and the U-shaped grooves with different depths can control the exposed size of the polymer optical fiber, so that the depth of the grinding groove is controlled. The exposed part of the optical fiber is ground by using an electric grinding rod to form a side wall slotted structure with a certain length, and the shape of the side wall slotted structure is shown in fig. 6.
The method for forming the side wall slotting structure in the laser processing mode comprises the following steps: the side wall of the polymer optical fiber is processed by adopting a carbon dioxide laser, the plastic optical fiber is fixed on a processing table board, parameters such as marking power, marking speed, marking times, marking interval and the like of the laser are set, the laser is started to mark the side wall of the optical fiber in a snake-shaped scanning mode, so that a grating type side wall slotting structure is formed, and the appearance of the grating type side wall slotting structure is shown in the attached figure 7.
The weaving preparation method of the optical fiber pulse fabric adopts plain, twill or satin fabric tissue, side light-emitting optical fibers and side photosensitive optical fibers are used as weft yarns, other yarns are inelastic, side light-emitting and side photosensitive parts of the optical fibers float on the surface of the fabric in a floating and long line mode, non-transparent yarns with the diameter larger than that of the optical fibers are added between the side light-emitting optical fibers and the side photosensitive optical fibers to form a light isolation area, and the yarns for light isolation comprise twisted yarns and polymer fibers.
The knitting preparation method of the optical fiber pulse fabric adopts a warp knitting weft insertion knitting mode, adopts a chain knitting warp flat fabric structure and a chain knitting warp flat fabric structure, adopts side luminous optical fibers and side photosensitive optical fibers as weft liner yarns to be lined in the knitted fabric, adopts light blocking yarns for optical isolation to be lined as weft liner yarns, and is placed between the side luminous optical fibers and the side photosensitive optical fibers, and the yarns for optical isolation comprise twisted yarns and polymer fibers.
The embroidery preparation method of the optical fiber pulse fabric comprises the steps that side light-emitting optical fibers and side photosensitive optical fibers are sewn into the fabric in an embroidery mode on the inelastic fabric, each optical fiber only forms a slightly-bent bulge on the front surface of the fabric, the slightly-bent bulges are arranged in an array mode to form a light-emitting area and a photosensitive area, and a light isolation area embroidered by black opaque yarns is arranged between the light-emitting area and the photosensitive area.
Example 1: the embodiment shows a preparation method of a woven process optical fiber pulse blood oxygen sensing fabric based on a slightly-bent convex structure.
The weft yarns of the optical fiber sensing fabric are 1000-micrometer PMMA polymer optical fibers, the rest weft yarns and the warp yarns are nylon viscose blended yarns, the light-blocking yarns between the two optical fibers are twisted yarns of 20 nylon viscose blended yarns, and the diameter of the light-blocking yarns is within 1-2 mm. And weaving the pulse fabric on a dobby loom.
The side light-emitting optical fiber and the side photosensitive optical fiber both adopt polymer optical fibers, and a microbend convex structure is formed on the polymer optical fibers by a hot pressing method.
Putting the polymer optical fiber into a mold with a micro-bending groove, heating the local part of the polymer optical fiber by using a hot air device, performing hot pressing and fixing on the polymer optical fiber after the polymer optical fiber in a heating area is softened, and cooling to form a micro-bending convex structure, wherein the size of the micro-bending convex structure is determined by the micro-bending groove of the mold. The top of the slightly curved protrusion is ground into a flat surface by sandpaper.
As shown in fig. 8, the optical fiber sensing fabric is divided into an upper normal fabric region a, a functional fabric region B, and a lower normal fabric region C in the warp direction. The warp yarns and the weft yarns of the common fabric area are all nylon viscose blended yarns and adopt a plain weave structure. The functional fabric area is used to implement pulse sensing.
The functional fabric area is divided into a left lining fabric D, an optical fiber fabric E and a right lining fabric F in the weft direction. Warp yarns and weft yarns of the lining fabric are all nylon viscose blended yarns, do not contain optical fibers, adopt plain weave, and have the warp density of 400 pieces/10 cm.
The optical fiber fabric is internally integrated with light-emitting and light-sensing optical fibers and light-blocking yarns, and the light-emitting and light-sensing optical fibers and the light-blocking yarns are sequentially divided into a front optical fiber fixing area G, an optical fiber floating long line area H and a rear optical fiber fixing area I according to different weaving modes. As shown in fig. 8, 3 light-emitting optical fibers 1 and 2 light-sensing optical fibers 2 are sequentially arranged in the optical fiber fabric along the warp direction, the outermost light-emitting optical fibers are alternately arranged, and light-blocking yarns 3 are woven between the optical fibers.
The optical fibers in the optical fiber fixing area are in a plain weave structure, the warp density is 400 pieces/10 cm, and the warp yarns tightly wrap the optical fibers to fix the optical fibers in the fabric. The optical fiber in the floating length line area is a micro-bending convex part and is used for light emitting and light sensing, the optical fiber is used as a floating length line and is exposed outside the fabric, no warp is wrapped on the surface of the optical fiber, and the width of the floating length line of the optical fiber micro-bending convex structure is about 0.3 cm. The light-blocking yarns in the optical fiber fabric area are all woven in a plain weave mode, and the surface of the light-blocking yarns is wrapped by warps.
The light-emitting optical fibers on the two sides of the optical fiber sensing fabric are bundled by the thermoplastic tubes respectively, the light-emitting optical fibers are connected with the dual-wavelength LED through the collimating device, the LED wavelength is 650nm and 905nm, the light-sensing optical fibers on the two sides of the fabric are bundled by the thermoplastic tubes respectively, and the light-sensing optical fibers are connected with the optical detector through the collimating device. The main control circuit module enables the LED to alternately emit light with different wavelengths, the light is irradiated on the surface of human skin through the micro-bent bulge of the light-emitting optical fiber, scattered light of human tissues is coupled by the micro-bent bulge structure of the photosensitive optical fiber to enter the photosensitive optical fiber, the scattered light is converted into an electric signal through the optical detector, the electric signal is collected by the main control circuit module, a light volume pulse wave signal is obtained, and the pulse rate and the oxyhemoglobin saturation are calculated through further processing. Fig. 9(a) and 9(b) show waveforms of photoplethysmography at fingertip positions, which are distinct and meet the application requirements.
Example 2: the embodiment shows a preparation method of a knitting process optical fiber pulse blood oxygen sensing fabric based on a laser grooving structure.
The optical fiber adopts PMMA polymer optical fiber with the diameter of 1000 mu m, the light-blocking yarn adopts 15 or 20 ply twisted yarns of low-elasticity high-temperature-resistant viscose/nylon yarn, and the diameter of the light-blocking yarn is within 1 to 2 mm. The rest yarns are cotton yarns with the fineness of 50 tex/3.
The fabric is woven on a warp knitting sample loom, the number of the fabric is E12, a knitting needle is a latch needle, a rear yarn guide frame (yarns do not need to be subjected to warping treatment) is adopted, negative warp feeding is carried out, and the fabric is directly drawn to a weaving area by the yarn guide frame to be woven.
The whole fabric is warp-knitted fabric, and the warp-knitted fabric has the advantages of stable size, stiff and smooth fabric, difficult falling off and the like, and has the characteristics of good air permeability, good drapability, soft fabric and the like due to the coil structure. The optical fiber has a large bending modulus, is not suitable for being interwoven with other textile yarns to form a knitted fabric, and can be used as a backing yarn to be added into the structure of the knitted fabric.
As shown in fig. 10, the optical fiber fabric of the present embodiment is divided into an upper normal fabric region a, a functional fabric region B, and a lower normal fabric region C. The common fabric area is used for ensuring the overall dimension stability of the fabric and is convenient to sew and connect with other fabrics. The functional fabric area contains optical fibers and is divided into a front optical fiber fixing area G, an optical fiber floating length line area H and a rear optical fiber fixing area I. The optical fiber floating long line area is provided with a light-emitting and light-sensing unit, and the length of the optical fiber floating long line area is 1.5-2 cm.
The upper common fabric area A and the lower common fabric area C adopt a chain warp flat tissue to ensure the stable size. The front optical fiber fixing area G and the rear optical fiber fixing area I also adopt a chaining warp-flat tissue which is tightly clamped with the lining yarns and has good skid resistance, and the polymer optical fibers are lined into the fabric in a weft insertion mode. The optical fiber floating long line area adopts a chaining organization, and the optical fibers and the light-blocking yarns float outside the chaining organization. In order to ensure that the optical fibers and the light-blocking yarns are flatly inserted into the fabric, a full-width weft insertion mode is adopted, in order to expose the light-emitting and light-sensing parts of the optical fibers, the full-width weft insertion is selected as an optical fiber fixing area in the weaving process, and the weft insertion weaving is not carried out in an optical fiber floating long line area, so that the optical fibers and the light-blocking yarns in the optical fiber floating long line area float on the surface of the fabric structure. And reserving optical fibers with certain lengths at two ends of the fabric for bundling, and connecting the optical fibers with a light source and a detector.
In the process of weaving a common fabric area and an optical fiber fixing area, a front comb is used for weaving a chain knitting tissue, and a back comb is used for weaving a warp flat tissue; when the optical fiber floating long line area is woven, yarns which are combed behind the optical fiber floating long line area are directly removed from non-weaving, and only a front comb is used for weaving a chaining organization. In the knitting process of the fabric of this example, the lateral density of the pillar warp flat structure was 30/5cm and the longitudinal density was 24/5cm, as shown in table 1.
TABLE 1 knitting process of warp-knitted optical fiber sensing fabric
| Name of art | Fiber float length region | Optical fiber fixing region | Plain fabric area |
| Function(s) | Luminous sensitization | Fixed optical fiber | Stable size |
| Guide bar | Single comb | Double comb | Double comb |
| Threading yarn | One through one hollow | One through one hollow | One through one hollow |
| Fabric weave | Chaining | Chain warp flat weave | Chain warp flat weave |
| Optical fiber integration method | Float on the surface of the fabric | Full width weft insertion | Without optical fibre |
After the fabric is woven according to the process, the optical fibers in the optical fiber floating long line area are subjected to laser marking and grooving to prepare the light-emitting and photosensitive structure. The carbon dioxide laser with the wavelength of 10.6 mu m is adopted to mark and groove optical fibers floating on the surface of the fabric in a snake-shaped scanning mode, the laser marking power is 10w, the marking times are 5 times, the marking speed is 250mm/s, 9 grooves are formed in each optical fiber, the width of each groove is about 1mm, the depth of each groove is about 130 mu m, and the length of a light-emitting photosensitive area on each optical fiber is about 1 cm. After the optical fibers and the light-blocking yarns floating on the fabric are placed into the heat-insulating film to be isolated from the common yarn fabric in the area, the warp knitted fabric is protected from being damaged in the laser marking process. And finally, finishing the preparation of the optical fiber pulse blood oxygen sensing fabric based on the laser grooving knitting process.
Claims (7)
1. An optical fiber sensing fabric for detecting pulse and blood oxygen saturation is characterized in that a plurality of side light-emitting optical fibers with side light-emitting units, a plurality of side photosensitive optical fibers with side photosensitive units and common yarns form the optical fiber fabric in a weaving mode, the side light-emitting optical fibers and the side photosensitive optical fibers are alternately arranged, an optical isolation area formed by the yarns is arranged between the side light-emitting optical fibers and the side photosensitive optical fibers, and a plurality of side light-emitting and side photosensitive units form a light-emitting and light-sensing array on the surface of the fabric to realize collection of red light and infrared waveband light volume pulse waves and calculation of the blood oxygen saturation.
2. The optical fiber sensing fabric for detecting pulse and blood oxygen saturation according to claim 1, wherein the optical fiber sensing fabric is divided into an upper common fabric area, a functional fabric area and a lower common fabric area in sequence in a warp direction; the functional fabric area is sequentially divided into a front optical fiber fixing area, an optical fiber floating long line area and a rear optical fiber fixing area in the weft direction, 3 light-emitting optical fibers and 2 light-sensitive optical fibers are sequentially arranged in the optical fiber floating long line area along the warp direction, the light-emitting optical fibers are arranged on the outermost side, the light-emitting optical fibers and the light-sensitive optical fibers are alternately arranged, and light-blocking yarns are woven among the optical fibers.
3. The optical fiber sensing fabric for pulse and blood oxygen saturation detection according to claim 1, wherein the side light emitting unit and the side light sensing unit are divided into a slightly curved convex structure and a side wall slotted structure in shape, wherein the slightly curved convex structure is realized by hot pressing, weaving or embroidering, and wherein the top of the slightly curved convex is ground into a plane; the side wall slotting structure is realized through stamping, grinding and laser processing.
4. A preparation method of an optical fiber sensing fabric for detecting pulse and blood oxygen saturation is characterized by adopting a weaving preparation method, a knitting preparation method or an embroidery preparation method.
5. The method for preparing the optical fiber sensing fabric for detecting pulse and blood oxygen saturation according to claim 4, wherein the weaving method adopts plain, twill or satin weave, the side light-emitting optical fiber and the side photosensitive optical fiber are used as weft yarns, other yarns are inelastic, the side light-emitting unit of the side light-emitting optical fiber and the side photosensitive unit of the side photosensitive optical fiber float on the surface of the fabric in a floating length mode, a non-transparent yarn with a diameter larger than that of the optical fiber is added between the side light-emitting optical fiber and the side photosensitive optical fiber to form an optical isolation region, and the yarns for optical isolation comprise twisted yarns and polymer fibers.
6. The method for preparing optical fiber sensing fabric for pulse and blood oxygen saturation detection according to claim 4, wherein said knitting method adopts a warp knitting weft insertion knitting manner, a chaining, chaining warp flat fabric weave is adopted, side light emitting optical fiber and side light sensing optical fiber are inserted into the knitting fabric as weft liner yarn, light blocking yarn for light isolation is also inserted as weft liner yarn, and is placed between the side light emitting optical fiber and the side light sensing optical fiber, and the yarn for light isolation includes twisted yarn and polymer fiber.
7. The method of claim 4, wherein the embroidery is made by sewing side light-emitting fibers and side light-sensing fibers into the inelastic fabric, each fiber having a slightly curved protrusion formed on the front surface of the fabric, the slightly curved protrusions being arranged in an array to form a light-emitting area and a light-sensing area, and a light-isolating area embroidered with black opaque yarn being formed between the light-emitting area and the light-sensing area.
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| CN114134654A (en) * | 2021-12-31 | 2022-03-04 | 东莞市新菲林纺织有限公司 | 3D embroidery and embroidery method thereof |
| CN114592256A (en) * | 2022-02-11 | 2022-06-07 | 广东飞和信息科技有限公司 | Physical sign detection method based on optical fiber detection |
| WO2023231685A1 (en) * | 2022-06-01 | 2023-12-07 | 人工智能设计研究所有限公司 | Jacquard knitted fabric allowing for multiple surface pattern designs, and weaving method |
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