CN100551284C - Human body temperature detection smart clothing and manufacturing method thereof - Google Patents

Abstract

The invention relates to a smart clothing for human body temperature detection, which includes a broadband light source, a coupler, a distributed optical fiber grating sensor, an FP tunable filter, and a packaged integrated circuit part arranged on the clothing. The distributed fiber grating sensor is connected with the FP tunable filter after the coupler; the integrated circuit part includes a microprocessor, a scanning voltage circuit, a photodetector, a signal conditioning circuit, and the output interface of the microprocessor is connected with the The scanning voltage circuit is connected, the scanning voltage signal generated by the scanning voltage circuit is loaded on the driving end of the FP tunable filter, and the optical signal output by the FP tunable filter is received by the photodetector, and the electrical signal generated is input through the signal conditioning circuit to the microprocessor. The invention also relates to a method for making the garment. The intelligent clothing of the present invention has the characteristics of lightness of use and can detect the temperature of the human body in real time.

Description

Human body temperature detection smart clothing and manufacturing method thereof

technical field

The invention belongs to the technical field of smart clothing, and relates to a smart clothing for detecting human body temperature.

Background technique

Smart clothing is a new field, which is the product of the combination and intersection of microelectronics technology, new sensor technology, modern communication technology, intelligent control technology, textile technology and other related new technologies. Smart clothing can not only perceive changes in the external environment or internal state, but also respond to such changes in real time through a feedback mechanism. Perception, feedback and reaction are the three major elements of smart clothing. In addition, it has the characteristics of light wear and real-time monitoring. It can be widely used in medical and health, military and aerospace, entertainment and communication, safety and security and other fields. It has a very broad application prospects.

The development and research of smart clothing originated in the late 1970s. At that time, electronic technology was still relatively backward, so the development of smart clothing was also very slow. It was bulky and cumbersome, and had a single function. Therefore, the application field of smart clothing is also very limited, mainly in special industries such as aerospace and military industry. In recent years, with the development of electronic technology, many foreign research institutions have begun to devote themselves to the research and development of smart clothing.

◆United States

DuPont of the United States has developed a new type of fiber that is conductive and can respond to electricity, heat or pressure. These fibers are already present in some fabrics, and they can be combined with electrical circuits to give clothes special functions, such as changing the color of the material according to electronic commands.

Scientists at the Massachusetts Institute of Technology are studying how to dress electronic products, that is, trying to integrate electronic devices such as mobile phones and PCs into clothes. They and Philips cooperated last year to launch smart clothing with "built-in" mobile phones and MP3 players.

Researchers at the Georgia Institute of Technology in the United States implanted fiber grating sensors into shirts to detect changes in heart rate, and hoped to judge the location and degree of soldiers' injuries based on the changes in the light output signal after the fiber was broken. SensaTex of the United States has industrialized it Production, and on this basis, it has further launched smart clothing that can check heartbeat, body temperature, breathing and calculate the number of calories burned by the wearer. It even warns the wearer that they may have a heart attack or heat stroke. This kind of smart clothing is also suitable for the elderly. It can be used to monitor important information in the elderly's body and issue an alarm before a dangerous fall may occur. The global positioning system in the clothing can even detect important patients. location.

◆United Kingdom

By combining woven, handwoven and printed fabrics with new conductive materials, a multidisciplinary research team at Redhill Laboratories in Surrey, UK, has created smart clothing that can be washed like normal clothes. Using materials that conduct electrical signals, they have developed a telephone keypad that fits in a shirt cuff or pocket, and are working on a mobile phone that fits in a jacket pocket.

◆Belgium

Belgian scientists are developing a smart clothing that combines mobile phones, computers and body monitoring equipment. This smart clothing can also use artificial intelligence to adjust its functions according to environmental changes.

The smart i-Wear, which is being developed by the Starlab Institute in Brussels, has multiple functional layers. The sensors on the inner layer can measure heartbeat, blood pressure and body temperature, monitor the health of the wearer, and even assess the wearer's mood in the future . The sensor on the outer layer of smart clothing can monitor the light, darkness and noise of the external environment, and make corresponding adjustments. For example, if you receive a call in a noisy environment, you will increase the ringtone; if you are in a quiet environment, such as a meeting room, the phone will The volume will be lowered automatically.

◆Japan

Kanebo Co., Ltd. of Japan encapsulated spiropyran photosensitive substances in microcapsules, and used printing technology to make photosensitive color-changing fabrics. After absorbing ultraviolet rays with a wavelength of 350-400nm, this fabric can change from colorless to light blue or dark blue. . Microencapsulation can improve the antioxidant capacity of photosensitizers, thereby prolonging the lifespan. Color-changing T-shirts produced using this technology are already on the market. This type of smart clothing is generally used in safety protective clothing and decorative fashion.

Among the literature reports on smart clothing that have been seen in China, they usually only introduce foreign literature reports or review literature reports on the development and research of smart clothing.

Contents of the invention

The object of the present invention is to provide a smart clothing capable of detecting body temperature at multiple points of the human body, and at the same time propose a manufacturing method of the smart clothing. The smart clothing and the manufacturing method provided by the present invention have the characteristics of being easy to use and being able to withstand a certain degree of machine washing.

The smart clothing of the present invention adopts the following technical solutions:

A smart clothing for human body temperature detection, including a broadband light source, a coupler, a distributed fiber grating sensor, an F-P tunable filter, and a packaged integrated circuit part arranged on the clothing. The broadband light source passes through the coupler and the distributed fiber grating The sensor is connected, and the distributed fiber grating sensor is connected to the F-P tunable filter after the coupler; the integrated circuit part includes a microprocessor, a scanning voltage circuit, a photodetector, a signal conditioning circuit, an output interface of the microprocessor and a scanning voltage circuit Connected, the scanning voltage signal generated by the scanning voltage circuit is loaded on the driving end of the F-P tunable filter, and the optical signal output by the F-P tunable filter is received by the photodetector and the electrical signal generated is input to the microprocessor through the signal conditioning circuit Optical fiber and conductive fiber are woven into the fabric of the garment, and the optical path between broadband light source, coupler, distributed fiber grating sensor, F-P tunable filter and packaged integrated circuit part is connected by optical fiber, and the circuit The power supply is connected by conductive fiber.

In the above technical solution, the integrated circuit part may be packaged with epoxy resin.

In the human body temperature detection smart clothing of the present invention, the scanning voltage circuit can include a D/A converter, a bipolar amplifier, and an inverter, and the digital signal generated by the microprocessor is converted into an analog signal by the D/A converter, and then passed through After the bipolar amplifier is amplified, it is divided into two paths, one path is directly connected to one drive end of the F-P tunable filter, and the other path is connected to the other drive end of the F-P tunable filter after passing through the inverter; the signal conditioning circuit It may include an amplification processing circuit and an A/D converter, and the electrical signal received from the photodetector is sent to the microprocessor after being amplified and converted by A/D.

The present invention also provides a method for manufacturing the above-mentioned smart clothing for detecting human body temperature, which includes the following steps:

(1) Fibers and conductive fibers are made into yarns by core wrapping and wrapping methods, and the warp and weft are arranged at intervals and woven into the fabric;

(2) After cutting and sewing, and bridging and welding at the seams, the fabrics made by the above methods are made into garments;

(3) Packaging integrated circuit part;

(4) Clothes made by embedding broadband light sources, couplers, distributed fiber grating sensors, F-P tunable filters and packaged integrated circuits respectively, the optical paths between them are connected by optical fibers, and the circuit power supply uses conductive fibers connect.

In the above manufacturing method, when encapsulating the integrated circuit part, the chip part can be encapsulated with epoxy resin, and the peripheral part can be reinforced and waterproof with rubber or plastic; it is better to use conductive adhesive to bind the pins of the integrated circuit part and the conductive fibers .

The smart clothing of the present invention adopts distributed optical fiber gratings for temperature sensing and detection, has the characteristics of light use, can withstand a certain degree of machine washing, and can detect the temperature of the human body in real time. Detection is of particular importance. In addition, the smart clothing of the present invention can also be applied to fields such as military and aerospace, entertainment and communication, safety and security, and has certain economic benefits.

Description of drawings

Fig. 1 Principle block diagram of distributed fiber grating sensing measurement system;

Figure 2 is a block diagram of a distributed fiber grating demodulation scheme for tunable fiber F-P filter detection;

Figure 3(a) The upstream part of the signal conditioning circuit;

Figure 3(b) The downstream part of the signal conditioning circuit;

Figure 4 Scan voltage circuit.

Detailed ways

The following first introduces the working principle and working process of the distributed fiber grating sensor.

The structure and working principle of fiber grating sensors have been described in many documents. According to the coupled-mode theory of fiber Bragg gratings, a uniform non-blazed fiber Bragg grating can couple one guided mode transmitted in it to another guided mode transmitted in the opposite direction to form a narrow-band reflection, and the peak reflection Bragg wavelength λ _B is

λ _B = 2n _eff Λ

where n _eff is the effective refractive index of the guided mode, and Λ is the grating period.

There are many factors that cause the drift of λ _B. If only the influence of temperature T is considered, then λ _B , n _eff , and A are only functions of T. Temperature changes lead to thermal expansion and contraction of fiber gratings and changes in refractive index, and the Bragg wavelength shifts they produce can be recorded as:

$\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;\&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; eff</span>}}}<span\; class="notranslate">\; \&CenterDot;</span>\frac{{\mathrm{<span\; class="notranslate">\; dn</span>}}_{\mathrm{<span\; class="notranslate">\; eff</span>}}}{\mathrm{<span\; class="notranslate">\; dV</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\frac{\mathrm{<span\; class="notranslate">\; dV</span>}}{\mathrm{<span\; class="notranslate">\; dT</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&Delta;T</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&xi;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&Delta;T</span>}$

In the formula, the normalized frequency of V-fiber;

ξ-the thermo-optic coefficient of the material, that is, the rate of change of n _eff with temperature;

α - coefficient of thermal expansion.

When α<<ξ

$\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&xi;</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; \&Delta;T</span>}$

High fiber grating temperature sensitivity, temperature-sensitized packaging of fiber grating, its wavelength change is:

Δλ=((α+ξ)+(1-Pe)(αZ-α))λΔT=αTΔT

In the formula, αT- is defined as the temperature sensitivity of the temperature sensor, which is obtained from the slope of the wavelength-temperature experimental curve; α-fiber grating thermal expansion coefficient; ξ-fiber grating thermo-optic coefficient; Pe-fiber effective photoelastic coefficient; αZ- The coefficient of thermal expansion of the sensitizing material.

The temperature change ΔT=Δλ/αT can be calculated by measuring the wavelength change.

The biggest feature of distributed fiber grating sensing measurement is that it belongs to the wavelength encoding type, rather than the (light) intensity measurement type. The optical path of the distributed fiber grating sensing measurement system is shown in Figure 1, and the core part is the wavelength analyzer.

In order to realize the practicality and industrialization of optical fiber sensing technology, many demodulation methods have been proposed, mainly including three categories, namely filtering method, interference method and adjustable light source scanning. The present invention adopts the solution of distributed sensor detected by adjustable optical fiber F-P cavity filter as shown in FIG. 2 . The demodulation principle of the demodulation system is based on the working principle of the tunable Fabry-Perot cavity (F-P demodulation). The fiber F-P cavity filter used for the demodulation of distributed fiber grating sensing signal is actually a voltage-controlled optical bandpass filter. Piezoelectric ceramics are usually used as the driving element for the change of F-P cavity length. A scanning voltage is applied to the piezoelectric ceramic, and the piezoelectric ceramic expands and contracts, thereby changing the cavity length of the F-P cavity and changing the wavelength of light passing through the F-P cavity. The transmitted light intensity is detected by the detector, and when the detector detects the maximum light intensity, the voltage applied to the piezoelectric ceramic corresponds to the reflected wavelength of the FBG. In this way, optical signals are injected into the Bragg fiber grating sensor, and the light reflected from the FBG sensor is added to the input end of the optical fiber F-P cavity filter. By adding a triangular scanning voltage to the voltage control end of the optical fiber F-P cavity filter, a time-domain electrical signal corresponding to the input optical spectrum can be obtained at the output end of the optical fiber F-P cavity filter. These time-domain signals are reshaped by the amplifier circuit and the comparison circuit to obtain a series of pulse signals. Some standard pulse signals with fixed wavelength and position are added to these pulse signals. The relative position contains the spectral information of the light reflected by the FBG sensor.

The weak electrical signal obtained by the photoelectric conversion of the PIN tube photodetector needs to be further amplified and conditioned by the signal conditioning circuit. After being sampled by A/D, the microprocessor performs digital filtering and other processing and stores it. This part of the circuit is shown in Figure 3(a) and (b). The input signal is amplified by U1 and U2 and sent to U3, U3 performs A/D conversion, and the output data is processed and stored by the microprocessor for digital filtering. The present invention does not provide a microprocessor and its peripheral circuits. When implementing the present invention, a single-chip microcomputer or DSP can be selected voluntarily according to the precision requirements. The circuit adopted in the embodiments of the present invention utilizes external A/D and D/A converters, and a microprocessor with internal A/D and D/A converters can also be used when implementing the present invention.

The scan voltage generation circuit is shown in Figure 3. The data output by the microprocessor is converted into an analog signal by U5D/A, further amplified and added to the 4th terminal of the F-P cavity filter (ie U4), and this signal is added to the 1st terminal of the F-P cavity filter after passing through the inverter at the same time. end.

The power management circuit adopts a mature circuit in the prior art to generate required operating voltages such as +5V, -5V, +3.3V, +2.5V, -2.5V for the present invention.

The human body temperature information collected by distributed fiber grating sensors distributed in various parts of the body is converted into electrical signals and sent to the microprocessor after processing. The microprocessor can obtain the temperature of multiple parts of the human body accordingly. Multi-point body temperature data or body temperature average data can be output through the liquid crystal display, and can also be output through the wireless or wired communication interface with the external computer.

The present invention adopts the method of core wrapping and wrapping to make optical fiber and conductive fiber into yarn, and weaves the warp and weft into the fabric at intervals during weaving or knitting. The body, sleeves, and collar of the ready-made garment have smooth signals, providing a vertical and horizontal conductive fiber network for embedding sensors and chips anywhere, and ensuring its normal durability and wearing performance, and at the same time it must withstand light machine washing. The fiber grating sensing element and the integrated circuit part are buried in the corresponding position of the clothes and fixed by sewing, so as not to affect the appearance and use as much as possible, and the operation is convenient. Concentrate all circuits and devices in the front panel of close-fitting clothing to avoid circuit connection problems at seams as much as possible.

The spinning, weaving or knitting process of conductive fiber adopts the production process of core-spun yarn (conductive fiber in the yarn core) and wrapping yarn (conductive fiber on the surface of the yarn), weaving or knitting (arranged at intervals in warp and weft or vertical and horizontal) to ensure that the spinning The yarn and weaving are smooth, and the normal cloth surface effect is achieved.

The connection between the conductive fiber or optical fiber and the integrated circuit part or the power supply battery adopts multiple connections to prevent the circuit from being damaged, broken, and a certain conductive fiber or optical fiber at the connection is broken during use and affecting normal work. Although good electrical contact can be obtained by soldering, the toxicity in traditional soldering ingredients makes it unsuitable because of its direct contact with the human body and the softness of the fabric is reduced. It is best to use a conductive adhesive with good conductivity, good durability, and good flexibility to bind the pins of the integrated circuit and the conductive fibers.

The cutting and sewing of clothing adopts the method of bridging welding and overlock seaming to connect the cutting lines, and ensure its normal durability and wearing performance, and at the same time, it must withstand light machine washing. In order to ensure the normal durability and wearing performance of the integrated circuit part, and at the same time withstand light machine washing, the integrated circuit part is buried in thick places such as the hem, cuff or collar of the clothing, so that the processing and operation are convenient, and it is not easy to wear. Affects wearing comfort and washing, and it is reinforced with high polymer.

Claims (7)

1. intelligent clothing capable of detecting human body temperature, comprise the wideband light source, coupler, distributed fiber grating sensor, F-P tunable optic filter and the process packaged integrated circuits part that are arranged on these clothes, wideband light source links to each other with the distributed fiber grating sensor by coupler, and the distributed fiber grating sensor links to each other with the F-P tunable optic filter behind coupler; Integrated circuit partly comprises electric power management circuit, microprocessor, scanning voltage circuit, photo-detector, signal conditioning circuit, the output interface of microprocessor links to each other with the scanning voltage circuit, the scanning voltage signal loading of being produced by the scanning voltage circuit is at the drive end of F-P tunable optic filter, and the optical signal of F-P tunable optic filter output is input to microprocessor through the signal of telecommunication that photo-detector receives the back generation by signal conditioning circuit; Optical fiber and conductive fiber in making the lining of clothes, have been inweaved, light path between wideband light source, coupler, distributed fiber grating sensor, F-P tunable optic filter and the process packaged integrated circuits part adopts optical fiber to connect, and circuit supply adopts the conductive fiber connection.

2. intelligent clothing capable of detecting human body temperature according to claim 1 is characterized in that integrated circuit partly adopts epoxy encapsulation.

3. intelligent clothing capable of detecting human body temperature according to claim 1, it is characterized in that, described scanning voltage circuit comprises D/A converter, bipolar amplifier, phase inverter, the data signal that is generated by microprocessor is converted into analog signal through D/A converter, after amplifying through bipolar amplifier again, be divided into two-way, the one tunnel is directly connected to a drive end of F-P tunable optic filter, and another road is through being connected to another drive end of F-P tunable optic filter behind the phase inverter.

4. intelligent clothing capable of detecting human body temperature according to claim 1, it is characterized in that, described signal conditioning circuit comprises amplification treatment circuit, A/D converter, receives the signal of telecommunication that comes from photo-detector and be admitted to microprocessor after amplifying processing and A/D conversion.

5. the preparation method of the described intelligent clothing capable of detecting human body temperature of claim 1 comprises the following steps:

(1) adopts the method for bag core and looping that optical fiber and conductive fiber are made into yarn, the arrangement spaced apart of its longitude and latitude is inweaved in the lining;

(2), and, the lining that the employing said method is made is made clothes in the seam crossing welding of putting up a bridge through cutting and making;

(3) encapsulated integrated circuit part;

(4) wideband light source, coupler, distributed fiber grating sensor, F-P tunable optic filter and process packaged integrated circuits part are imbedded the clothes of making respectively, the light path between them adopts optical fiber to connect, and circuit supply adopts the conductive fiber connection.

6. the preparation method of intelligent clothing according to claim 5 is characterized in that, when integrated circuit was partly encapsulated, chip partly adopted epoxy encapsulation, and periphery is with rubber or plastic consolidation waterproof.

7. the preparation method of intelligent clothing according to claim 5 is characterized in that, adopts electroconductive binder to carry out the binding of integrated circuit part pin and conductive fiber.

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