A vital sign optical fiber sensing unit, sensor and intelligent sensing device

Abstract

The present invention discloses a vital sign optical fiber monitoring unit, wherein a first optical fiber sensing part is arranged horizontally to form a first sensing layer, a second optical fiber sensing part is arranged to form a second sensing layer, the first sensing layer and the second sensing layer are stacked and the first optical fiber sensing part and the second optical fiber sensing part are arranged crosswise; the refractive index of the optical fiber changes after being compressed, and the microscopic or macroscopic movement caused by the heartbeat, breathing and body activities of the body is used to apply pressure to the double-layer cross-arranged optical fiber sensing layer, and the upper and lower optical fiber sensing parts are relatively pressed, thereby greatly improving the strength and sensitivity of the detection signal. The present invention also proposes a vital sign optical fiber sensor and an intelligent sensing device.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber technology, and in particular to a vital sign optical fiber monitoring unit, a sensor and an intelligent sensing device. Background Art

[0002] With the development of the medical and health industry, daily monitoring of vital signs has received increasing attention. Existing vital sign monitors usually use a single signal to detect a single indicator, and also have certain requirements for body posture during monitoring. Fiber optic sensors have gained more and more attention due to their sensitivity to pressure, temperature, vibration, etc. Fiber optic sensors are highly sensitive, chemically inert, easy to carry, and soft in texture and can be integrated into daily household products. However, when fiber optic sensors are used for vital sign monitoring, the environmental noise is large, which can easily cause phase changes in the optical signal, leading to signal fading and inaccuracy, resulting in unreliable monitoring results. At the same time, due to the material of the optical fiber itself, in order to increase the signal strength, when the pressure is increased, it is easy to cause the optical fiber to break. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes a vital sign optical fiber sensing unit, a sensor and an intelligent sensing device.

[0004] A vital sign optical fiber sensing unit proposed in the present invention comprises: a first optical fiber sensing part and a second optical fiber sensing part;

[0005] The first optical fiber sensing parts are arranged transversely to form a first sensing layer, the second optical fiber sensing parts are arranged longitudinally to form a second sensing layer, the first sensing layer and the second sensing layer are stacked and the first optical fiber sensing parts and the second optical fiber sensing parts are arranged crosswise.

[0006] Preferably, the first optical fiber sensing portion and the second optical fiber sensing portion are sequentially connected and formed integrally.

[0007] In the present invention, in the proposed vital sign optical fiber sensing unit, the first optical fiber sensing part is arranged horizontally to form a first sensing layer, the second optical fiber sensing part is arranged vertically to form a second sensing layer, the first sensing layer and the second sensing layer are stacked and the first optical fiber sensing part and the second optical fiber sensing part are arranged crosswise; the refractive index of the optical fiber changes after being compressed, and the microscopic or macroscopic movement caused by the body's heartbeat, breathing and body activities is used to apply pressure to the double-layer cross-arranged optical fiber sensing layer, and the upper and lower optical fiber sensing parts are relatively pressurized, thereby greatly improving the strength and sensitivity of the detection signal.

[0008] The present invention also provides a vital sign optical fiber sensor, comprising at least one optical fiber sensing unit as described above.

[0009] Preferably, it also includes a light source unit and a receiving unit;

[0010] The light incident end of the optical fiber sensing unit is connected to the output end of the light source unit, and the light emitting end thereof is connected to the receiving unit.

[0011] Preferably, the receiving unit comprises a first receiver and a second receiver, the light emitting end of the first optical fiber sensing portion is connected to the first receiver, and the light emitting end of the second optical fiber sensing portion is connected to the second receiver.

[0012] Preferably, it comprises a plurality of the optical fiber sensing units connected in series.

[0013] In the present invention, a vital sign optical fiber sensor is proposed, and its technical effect is similar to that of the above-mentioned vital sign optical fiber sensing unit, so it will not be described in detail.

[0014] The present invention also provides an intelligent sensing device, comprising a base pad and the above-mentioned vital sign optical fiber sensor.

[0015] Preferably, a first receiving groove and a second receiving groove arranged crosswise are provided on the base pad, and the first optical fiber sensing portion and the second optical fiber sensing portion are respectively located in the first receiving groove and the second receiving groove and the two are arranged in a stacked manner.

[0016] Preferably, the first receiving groove and the second receiving groove both extend in an S-shaped direction, and are cross-arranged on the base pad to form a grid structure.

[0017] Preferably, the first optical fiber sensing portion is located above the second optical fiber sensing portion, the bottom height of the first receiving groove is higher than the bottom height of the second receiving groove, and a staggered step matching the first optical fiber sensing portion and the second optical fiber sensing portion is formed at the intersection of the first receiving groove and the second receiving groove;

[0018] Preferably, the second optical fiber sensing portion is connected to the base pad at the staggered steps.

[0019] Preferably, it also includes a cover pad, which covers the bottom pad;

[0020] Preferably, the bottom of the cover pad is provided with a first pressure strip and a second pressure strip corresponding to the first optical fiber sensing portion and the second optical fiber sensing portion respectively;

[0021] More preferably, the first pressure strip and / or the second pressure strip are made of silicone material.

[0022] Preferably, the cover pad and / or the bottom pad are both made of glass fiber material.

[0023] In the present invention, the proposed intelligent sensing device utilizes the above-mentioned vital sign optical fiber sensor to ensure comfort when the human body applies pressure to the cushion body, and at the same time, detects the vital signs sensitively and accurately through the detection signal formed by the pressure on the optical fiber sensing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of an arrangement of a vital sign optical fiber sensing unit proposed by the present invention.

[0025] Figure 2 This is a structural schematic diagram of another arrangement of a vital sign optical fiber sensing unit proposed by the present invention.

[0026] Figure 3 A vital sign optical fiber sensor proposed by the present invention and Figure 1 Schematic diagram of the structure of the corresponding connection method.

[0027] Figure 4 A vital sign optical fiber sensor proposed by the present invention and Figure 2 Schematic diagram of the structure of the corresponding connection method.

[0028] Figure 5 This is a schematic structural diagram of a base pad of an intelligent sensing device proposed by the present invention.

[0029] Figure 6 This is a structural schematic diagram of a cover pad for an intelligent sensor device proposed by the present invention.

[0030] Figure 7 This is a partial structural diagram of the cooperation between a pressure strip and a receiving groove of an intelligent sensor device proposed by the present invention. DETAILED DESCRIPTION

[0031] like Figures 1 to 7 As shown, Figure 1 This is a structural schematic diagram of an arrangement of a vital sign optical fiber sensing unit proposed by the present invention. Figure 2 This is a structural schematic diagram of another arrangement of a vital sign optical fiber sensing unit proposed by the present invention. Figure 3 A vital sign optical fiber sensor proposed by the present invention and Figure 1 The corresponding connection diagram is shown below. Figure 4 A vital sign optical fiber sensor proposed by the present invention and Figure 2 The corresponding connection diagram is shown below. Figure 5 This is a structural schematic diagram of a connection method of a vital sign optical fiber sensor proposed by the present invention. Figure 6 This is a structural schematic diagram of a base pad of an intelligent sensor device proposed by the present invention. Figure 7 This is a structural schematic diagram of a cover pad of an intelligent sensing device proposed by the present invention.

[0032] Reference Figure 1 and 2, a vital sign optical fiber sensing unit proposed by the present invention comprises: a first optical fiber sensing part 1 and a second optical fiber sensing part 2;

[0033] The first optical fiber sensing part 1 is arranged horizontally to form a first sensing layer, and the second optical fiber sensing part 2 is arranged vertically to form a second sensing layer. The first sensing layer and the second sensing layer are stacked and the first optical fiber sensing part 1 and the second optical fiber sensing part 2 are arranged crosswise.

[0034] In the specific setting of the optical fiber sensing unit, such as Figure 1 As shown, the first optical fiber sensing unit 1 and the second optical fiber sensing unit 2 can be formed by two sensing optical fibers being cross-laminated. Figure 2 As shown, it can also be formed by bending and crossing the two ends of a sensing optical fiber.

[0035] Reference Figure 3 and 4 , this embodiment also proposes a vital sign optical fiber sensor, comprising at least one of the above optical fiber sensing units; further, the vital sign optical fiber sensor also includes a light source unit 3 and a receiving unit 4;

[0036] The light incident end of the optical fiber sensing unit is connected to the output end of the light source unit 3 , and the light emitting end thereof is connected to the receiving unit 4 .

[0037] In the present embodiment, in the proposed vital sign optical fiber sensing unit and optical fiber sensor, the first optical fiber sensing portion is arranged horizontally to form a first sensing layer, the second optical fiber sensing portion is arranged to form a second sensing layer, the first sensing layer and the second sensing layer are stacked and the first optical fiber sensing portion and the second optical fiber sensing portion are cross-arranged; the refractive index of the optical fiber changes after being compressed, and the microscopic or macroscopic movement caused by the body's heartbeat, breathing, and body activities is used to apply pressure to the double-layer cross-arranged optical fiber sensing layer, and the upper and lower optical fiber sensing portions are relatively pressurized, thereby greatly improving the strength and sensitivity of the detection signal.

[0038] Reference Figure 3 In a specific embodiment of the vital sign optical fiber sensing unit, the first optical fiber sensing part 1 and the second optical fiber sensing part 2 can be arranged in a stacked manner using two separate sensing optical fibers; accordingly, in the setting of the vital sign optical fiber sensor, the receiving unit 4 includes a first receiver 41 and a second receiver 42, the light emitting end of the first optical fiber sensing part 1 is connected to the first receiver 41, and the light emitting end of the second optical fiber sensing part 2 is connected to the second receiver 42.

[0039] During specific detection, the light signal emitted by the light source unit passes through the first optical fiber sensing part and the second optical fiber sensing part respectively, and then is received by the first receiver and the second receiver respectively; when the human body contacts one side of the optical fiber sensing unit, the microscopic or macroscopic movement caused by heartbeat, breathing and body activity exerts pressure on one side of the optical fiber sensing unit, so that the intersection of the first optical fiber sensing part and the second optical fiber sensing part is relatively pressurized, so that the refractive index of the corresponding positions of the two changes, and the light signals received by the two receivers change, and the two light signals are superimposed and processed, so as to achieve sensitive and accurate monitoring of vital signs.

[0040] Reference Figure 4 In another specific embodiment of the vital sign optical fiber sensing unit, the first optical fiber sensing part 1 and the second optical fiber sensing part 2 are sequentially connected and formed as one body; in a specific arrangement, the first sensing layer and the second sensing layer can be sequentially wired by sequentially bending and stacking the entire optical fiber.

[0041] Correspondingly, one end of the first optical fiber sensing part away from the second optical fiber sensing part is connected to the output end of the light source unit, and one end of the second optical fiber sensing part away from the first optical fiber sensing part is connected to the receiving unit.

[0042] During detection, the light signal emitted by the light source unit passes through the first optical fiber sensing part and the second optical fiber sensing part in sequence and enters the receiving unit. When pressure is applied to the first sensing layer and the second sensing layer from one side of the optical fiber sensing unit, the crossing position of the first optical fiber sensing part and the second optical fiber sensing part is simultaneously pressurized due to the cross arrangement of the first optical fiber sensing part and the second optical fiber sensing part, which greatly enhances the detection signal strength and reduces the influence of noise on the detection result.

[0043] In the actual design of the optical fiber sensor, the optical fiber sensor also includes a photoelectric transmitting tube current control module, a photoelectric receiving tube signal amplification module, a data acquisition module, a data processing module, and a data wireless transmission module. The current of the photoelectric transmitting tube current control module is adjustable from 1mA to 60mA, the gain resistance of the photoelectric receiving tube signal amplification module is adjustable from 50Ω to 2KΩ, the data acquisition module has an optional frequency of 128Hz, the light source unit uses a photoelectric transmitting tube, the center wavelength is 1200-1600nm, the 3dB bandwidth is less than 5nm, the power is adjustable from 0.1mW to 10mW, and the receiving unit uses a photoelectric receiving tube, the response wavelength is 1260nm-1610nm, and the response sensitivity at 1310nm is greater than 0.5μA / μW.

[0044] In the specific design method of the optical fiber sensor, it can include multiple optical fiber sensing units connected in series in sequence, which is convenient for designing the optical fiber sensor according to the monitoring area required for various usage scenarios. It can reduce the crosstalk between various sensing areas, reduce the optical power fluctuations caused by the optical fiber sensor hardware itself, and improve the stability and consistency of the optical fiber sensor.

[0045] The optical fiber sensor for vital signs of this embodiment can be applied to mattresses, seat cushions, back cushions, and wearable sensors. In addition, the sensor of this embodiment can also be used as a carrier of clothing such as vests and coats to monitor vital signs by wearing clothing on the human body.

[0046] Reference Figure 5 and 6 , in order to explain in detail the specific application of the vital signs optical fiber sensor of this embodiment, this embodiment also proposes an intelligent sensing device, including a base pad 5 and the above-mentioned vital signs optical fiber sensor;

[0047] In a specific embodiment of the base pad, a first receiving groove and a second receiving groove arranged crosswise are provided on the base pad 5, and the first optical fiber sensing part 1 and the second optical fiber sensing part 2 are respectively located in the first receiving groove and the second receiving groove and the two are arranged in a stacked manner.

[0048] In a specific design, the first receiving groove and the second receiving groove both extend in an S-shaped direction, and the two are cross-arranged on the base pad 5 to form a grid structure. When arranged, the second optical fiber sensing part is arranged in the second receiving groove along the S shape, and then the first optical fiber sensing part is arranged in the first receiving groove along the S shape above the second optical fiber sensing part, so that the intersection points between the first optical fiber sensing part and the second optical fiber sensing part are distributed in a grid shape, thereby realizing the monitoring of the human body on the entire surface of the base pad.

[0049] In the specific wiring method of the base mat, the bare wire area of ​​the optical fiber is distributed in the groove pattern on the upper surface of the floor, the opening surface of the linear groove is sealed with tape, and the opening surface of the square groove is exposed. The optical fiber crosses in the square groove, and the intersection point is located at the geometric center of the square groove. In each basic unit, the optical fiber crosses to form a mesh grid.

[0050] Reference Figure 7 In the specific arrangement of the first optical fiber sensing part and the second optical fiber sensing part, the first optical fiber sensing part 1 is located above the second optical fiber sensing part 2, the bottom height of the first receiving groove is higher than the bottom height of the second receiving groove, and an interlaced step matching the first optical fiber sensing part 1 and the second optical fiber sensing part 2 is formed at the intersection of the first receiving groove and the second receiving groove; through the height difference between the first receiving groove and the second receiving groove, the first optical fiber sensing part and the second optical fiber sensing part are supported when pressure is applied to prevent the intersection of the first optical fiber sensing part and the second optical fiber sensing part from being damaged by excessive pressure.

[0051] In order to ensure that the crossing position is not easily offset, the second optical fiber sensing part 2 is connected to the base pad 5 at the staggered step.

[0052] In other specific designs of the intelligent sensor device, a cover pad 6 is further included, and the cover pad 6 covers the bottom pad 5;

[0053] In order to improve the detection sensitivity of the optical fiber sensing part when pressure is applied, a first pressure strip 7 and a second pressure strip 8 corresponding to the first optical fiber sensing part 1 and the second optical fiber sensing part 2 are provided at the bottom of the cover pad 6, and the first pressure strip abuts against the first optical fiber sensing part and the second pressure strip abuts against the second optical fiber sensing part; preferably, the first pressure strip 7 and / or the second pressure strip 8 are made of silicone material.

[0054] When the fiber optic sensor is under pressure, the cover pad deforms downward, and the intersection of the rubber strips on the lower surface of the cover pad applies pressure to the intersection of the optical fiber, causing the optical power in the optical fiber to change. Since vital signs signals, heart rate and respiration are periodic signals, the original signal monitored by the fiber optic sensor can be analyzed and extracted by detecting the optical power signal. When multiple pressure signals of different frequencies (including noise signals) act on the fiber optic sensor at the same time, the frequencies or periods of different pressure signals can be extracted through conventional Fourier transform and periodic statistical algorithms, thereby obtaining data such as heart rate and respiration.

[0055] In actual usage, the fiber optic sensor is placed under the chest of a person lying on his back or side (in close contact), and the corresponding algorithm can be used to extract the person's breathing and heart rate in real time; if a palm, silicone, Simmons or other mattress is added between the person lying on his back or side and the fiber optic sensor, each of which has its own maximum thickness. Within the maximum thickness of the corresponding mattress, the person's breathing and heart rate can also be extracted in real time through the corresponding algorithm.

[0056] In the specific selection of materials, the cover pad 6 is also included, and the cover pad 6 and / or the bottom pad 5 are both made of glass fiber material.

[0057] In other specific design methods, edge banding strips are pasted around the upper surface of the base pad. The material is silicone, the width is 15mm, the thickness is 1.5mm, the outer side of the edge banding strip is aligned with the outer side of the base pad. After the cover pad and the base pad are attached, the edge banding strip is located between the lower surface of the cover pad and the upper surface of the base pad.

[0058] In actual products, the intelligent sensing device of this embodiment can be used as an intelligent unit, which can be integrated into existing mattresses, seat cushions, and back cushions, or it can be used as a carrier for clothing such as vests and coats to achieve vital sign monitoring through the human body wearing clothing.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vital sign optical fiber sensor, characterized in that: include: A light source unit (3), a receiving unit (4) and at least one optical fiber sensing unit; The at least one optical fiber sensing unit comprises: a first sensing optical fiber and a second sensing optical fiber; the first sensing optical fiber is arranged transversely to form a first sensing layer, the second sensing optical fiber is arranged longitudinally to form a second sensing layer, the first sensing layer and the second sensing layer are stacked and arranged crosswise to form a sensing network; The light incident ends of the first sensing optical fiber and the second sensing optical fiber are both connected to the output end of the same light source unit (3), and their light emitting ends are connected to the receiving unit (4); The receiving unit (4) comprises a first receiver (41) and a second receiver (42), the light emitting end of the first sensing optical fiber is connected to the first receiver (41), and the light emitting end of the second sensing optical fiber is connected to the second receiver (42); During detection, when the human body comes into contact with one side of the optical fiber sensing unit, microscopic or macroscopic movements caused by heartbeat, breathing and body activities exert pressure on one side of the optical fiber sensing unit, causing relative pressure on the intersection of the first sensing fiber and the second sensing fiber, causing the refractive index at their corresponding positions to change, and the optical signals received by the two receivers to change. By superimposing the two optical signals, sensitive and accurate monitoring of vital signs can be achieved.

2. The vital sign optical fiber sensor according to claim 1, characterized in that: It comprises a plurality of optical fiber sensing units which are connected in series.

3. An intelligent sensing device, characterized in that: It comprises a base pad (5) and a vital sign optical fiber sensor according to any one of claims 1 to 2; A first receiving groove and a second receiving groove are arranged crosswise on the bottom pad (5), and the first sensing optical fiber and the second sensing optical fiber are respectively located in the first receiving groove and the second receiving groove and the two are arranged in a stacked manner; The first sensing optical fiber is located above the second sensing optical fiber, the bottom height of the first receiving groove is higher than the bottom height of the second receiving groove, and a staggered step that cooperates with the first sensing optical fiber and the second sensing optical fiber is formed at the intersection of the first receiving groove and the second receiving groove, and the second sensing optical fiber is connected to the bottom pad (5) at the staggered step.

4. The intelligent sensing device according to claim 3, characterized in that: The first accommodating groove and the second accommodating groove both extend in an S-shaped direction, and are cross-arranged on the base pad (5) to form a grid structure.

5. The intelligent sensing device according to claim 3, characterized in that: It also comprises a cover pad (6), which covers the bottom pad (5).

6. The intelligent sensing device according to claim 3, characterized in that: A first pressure strip (7) and a second pressure strip (8) corresponding to the first sensing optical fiber and the second sensing optical fiber respectively are provided at the bottom of the cover pad (6).

7. The intelligent sensor device according to claim 6, characterized in that: The first pressure strip (7) and / or the second pressure strip (8) are made of silicone material.

8. The intelligent sensing device according to claim 6, characterized in that: The cover pad (6) and / or the bottom pad (5) are both made of glass fiber material.

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