CN105078419B - Flexible liquid crystal temperature sensor and preparation method - Google Patents

Flexible liquid crystal temperature sensor and preparation method Download PDF

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Publication number
CN105078419B
CN105078419B CN201510575522.9A CN201510575522A CN105078419B CN 105078419 B CN105078419 B CN 105078419B CN 201510575522 A CN201510575522 A CN 201510575522A CN 105078419 B CN105078419 B CN 105078419B
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liquid crystal
nanometers
titanium
layer
skin
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CN105078419A (en
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高丽
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Abstract

The invention discloses a kind of flexible liquid crystal temperature sensor and preparation method thereof, wherein the flexible liquid crystal temperature sensor includes absorbed layer(1a), positioned at the absorbed layer side heat become liquid crystal array(1b), cover it is described heat become liquid crystal array layer of elastomer material(1c), and positioned at the resistance heating layer of absorbed layer opposite side(1d).The present invention has the advantage such as high precision, low cost, good permeability and thickness of thin, can be close to skin, and when in use between it is more long in the case of will not cause that moisture content of skin increases and temperature is raised.In addition, data acquisition of the present invention is simple, can quick mapping skin Temperature Distribution;It can be heated by detachable battery, so as to calculate the water content of skin according to skin thermal conductivity.

Description

Flexible liquid crystal temperature sensor and preparation method
Technical field
The invention belongs to medical diagnosis/evaluation apparatus, particularly a kind of flexible liquid crystal temperature sensor and preparation method thereof.
Background technology
The Temperature Distribution of human body has certain stability and characteristic, and the temperature at each position of body is different, forms different Thermal field.When human body blood supply organ, when integumentary musculature tissue or blood vessel generation disease or function change, the CBF meeting of blood vessel Change, cause the change of near vessels local skin temperature.And there is the situation of wound and inflammation in integumentary musculature tissue The change of temperature can be caused.According to this principle, technical staff devises various sensors that can measure skin temperature, for example Thermal infrared imager, flexible electronic skin etc., infer and monitor source and the process of lesion with this
The precision of thermal infrared imager is higher, but its cost is also very high, it is difficult in clinical and daily life extensive use. The structure of flexible electronic skin has a diversified forms, common including metal thin film resistor array temperature sensors.Metallic film electricity Resistance temperature sensor needs to be connected and carry out data analysis using fine measuring instrument with outside supply source circuit, and is unsuitable for daily Use, and its device area and density cannot be reached higher spatial resolution by traditional light section technology restriction to temperature mapping. And the structure of existing thermo-color liquid crystal adhesive cover products mainly includes seven layers, including polyester layer, printing type face layer, thermo-color liquid crystal Layer, absorbed layer, cohesive material basalis and paper carrier layer.When in use, it is attached to skin surface to measure, according to mesh Surveying liquid crystal color present position judges temperature just.Because its thickness is 75 ~ 125 microns, permeability is poor, easily causes The aggregation of heat and moisture, so that precision is poor, the degree of accuracy is only 0.6 DEG C.Meanwhile, its mechanical property is poor, can only realize one Fixed flexible simultaneously can be used only in the positions such as more flat skin such as forehead, then uncomfortable in many joints of human body or surface location Preferably use.
The content of the invention
Goal of the invention:One purpose is to provide a kind of flexible liquid crystal temperature sensor, exists extremely to solve prior art A few problem.Further objective is that providing a kind of method for making above-mentioned flexible liquid crystal temperature sensor.
Technical scheme:A kind of flexible liquid crystal temperature sensor, including absorbed layer, the heat positioned at the absorbed layer side become liquid Brilliant array, the layer of elastomer material for covering the heat change liquid crystal array, and positioned at the resistance heating layer of absorbed layer opposite side.
In a further embodiment, the absorbed layer is the elastomeric material for being mixed with black oxidation iron powder, elasticity Body material includes dimethyl silicone polymer.The resistance heating layer includes serpentine resistive heater and snakelike wire.The absorption The thickness of layer is 20 microns, and the height that the heat becomes liquid crystal array is 25 microns, and the layer of elastomer material is 30 microns.
In other embodiments, the flexible liquid crystal temperature sensor also includes adhesion body, and the adhesion body has One hollow-out parts, the flexible liquid crystal temperature sensor is located at the hollow-out parts, edge and the adhesion of flexible liquid crystal temperature sensor Body is fixedly connected.
Further, the invention also discloses a kind of preparation method of flexible liquid crystal temperature sensor, comprise the following steps:
Step 1, elastomeric material is mixed with black oxidation iron powder, with sol evenning machine, painting black absorbs on loading plate Layer is simultaneously dried;
Step 2, upper heat dipped in the seal with columnar arrays become and liquid-crystal ink liquid and air-dry,
Step 3, with heat gluing liquid crystal array of release, and be affixed on the one side of the black absorbing layer, rise high-temperature, make heat Release glue departs from liquid crystal array, with sol evenning machine in one layer of layer of elastomer material of liquid crystal array side spin coating;
Step 4, wireless electric heating layer is prepared, and transfer them to the another side of black absorbing layer.
In a further embodiment, the detailed process for wireless electric heating layer being prepared in the step 4 is:
Step 41, with sol evenning machine in the strata methyl methacrylate of silicon chip surface spin coating one, dry, continue the strata of spin coating one Acid imide, dries;
Step 42, evaporation titanium and gold, serpentine resistive heater is obtained using photoetching development and wet etching method;
Step 43, evaporation titanium/copper/titanium/gold, snakelike wire and solderable electricity are obtained using photoetching development and wet etching method The electrode on road;
Step 44, the strata acid imide of spin coating one, dry, and are encapsulated whole device using photoetching development and wet etching method, Obtain by the resistance heater of polyimides coated metal line;
Step 45, polymethyl methacrylate is dissolved in acetone, resistance heater is transferred to water-soluble adhesive tape, be deposited with Upper titanium and silica.
In step 41, the thickness of polymethyl methacrylate is 100 nanometers, and the thickness of titanium and gold is respectively 5 in step 42 Nanometer and 50 nanometers, in step 43, the thickness of titanium/copper/titanium/gold is respectively 10 nanometers, 500 nanometers, 10 nanometers and 20 nanometers, walks In rapid 45, the thickness of titanium and silica is respectively 5 nanometers and 30 nanometers.The resistance of the serpentine resistive heater be 800 ~ 1200 ohm.
Implement the invention has the advantages that:The present invention has high precision, low cost, good permeability and thickness of thin etc. Advantage, can be close to skin, can be used for curvature skin surface higher, and when in use between it is more long in the case of will not cause Moisture content of skin increases and temperature accumulation.In addition, data acquisition of the present invention is simple, can quick mapping skin Temperature Distribution; In case of need, resistor can be heated by connecting detachable battery, so as to calculate skin according to skin thermal conductivity The water content of skin;Resistor can also be placed in above blood vessel, be divided near vessels skin heat dissipating after the heating Analyse and speculate VPV and direction.
This product can be applied to the monitoring of the body temperature and moisture content of skin in medical industry daily life, also can be used as hospital To especial patient in environment(Such as subcutaneous fat is blocked up)The locating injection of arterial-venous is carried out, or by carrying out arteries Blood blocking return time test come aid in doctor to the diagnosis of heart of patient working condition and analysis vascular flow direction with The properties such as speed.
Brief description of the drawings
Fig. 1 a and Fig. 1 b are the structural representations of flexible liquid crystal temperature sensor of the present invention.
Fig. 2 a to 2d are practical work process of the present invention and effect diagram.
Fig. 3 is the structural representation of resistor of the present invention.
Specific embodiment
As shown in Figure 1a, flexible liquid crystal temperature sensor of the invention, mainly including absorbed layer 1a, positioned at absorbed layer side Heat become the layer of elastomer material 1c that liquid crystal array 1b, cover heating become liquid crystal array, and positioned at the resistance of absorbed layer opposite side Zone of heating 1d.
When in use, heat becomes liquid crystal array in different temperature(33-38℃)The different color of lower display, using computer Collection color data, and by its with database in date comprision, temperature data can be obtained.The embodiment and existing skill Contrastingly, its number of plies is significantly reduced art, and selected backing material mechanical property is significantly superior, therefore can be made product thinner It is more soft.Product is thinner, and the ability that it adheres to skin is better, therefore can be not only used for the use at smooth skin, may be used also At non-smooth skin.
Specifically, absorbed layer is the elastomeric material for being mixed with black oxidation iron powder, and elastomeric material includes poly- diformazan Radical siloxane or similar compound, specifically can as requested with the parameter determination of material.The resistance heating layer includes snakelike Resistance heater and snakelike wire.Resistance electric heating layer can produce heat, heat to expand from centre to surrounding after battery-powered Dissipate, diffusion mode is closely related with skin thermal conductivity.If used on the skin of different moisture content, can be led according to skin Heating rate calculates water content, and detailed process is described below.
In certain specific product, the thickness of absorbed layer is about 20 microns, and the height that heat becomes liquid crystal array is for about 25 micro- Rice, layer of elastomer material is about 30 microns.The thickness of other layers is in terms of nanometer, therefore the integral thickness of product is 50 microns of left sides The right side, 100 microns average much smaller than existing product of thickness.Due to the change of material, its Young's modulus drops compared with existing product More than low thousand times, tensility also rises to stretchable 200% by non-stretchable.
Fig. 1 b are gone to, in a further embodiment, flexible liquid crystal temperature sensor also includes adhesion body 2, described viscous Additional copy body 2 has a hollow-out parts, and the flexible liquid crystal temperature sensor 1 is located at the hollow-out parts, flexible liquid crystal temperature sensor Edge with adhesion body be fixedly connected.Because this product is very soft ultra-thin, cause model ylid bloom action power very strong, if individually Use, then possible crinkle is into one.Dress for convenience and win, adhesion body has been added on original structure(Such as medical adhesive Band etc.), by hollow out in the middle of square medical adhesive tape, the edge of soft this product being affixed on adhesive tape, middle hollow part is then covered with The device of liquid crystal dots, and adhesive tape then protection device edge, tear off adhesive tape in use.
The preparation method of description flexible liquid crystal temperature sensor of the present invention.
Step 1, elastomeric material is mixed with black oxidation iron powder, with sol evenning machine, painting black absorbs on loading plate Layer is simultaneously dried;
Step 2, upper heat is dipped in the seal 101 with columnar arrays become liquid-crystal ink liquid 102 and air-dry,
Step 3, with heat gluing 104 liquid crystal arrays of release, and be affixed on the one side of the black absorbing layer, rise high-temperature, Heat release glue 104 is set to depart from liquid crystal array, with sol evenning machine in one layer of layer of elastomer material of liquid crystal array side spin coating;
Step 4, resistance heating layer is prepared, and transfer them to the another side of black absorbing layer.
In a further embodiment, the detailed process for resistance heating layer being prepared in the step 4 is:
Step 41, with sol evenning machine in the strata methyl methacrylate of silicon chip surface spin coating one, dry, continue the strata of spin coating one Acid imide, dries;
Step 42, evaporation titanium and gold, serpentine resistive heater is obtained using photoetching development and wet etching method;
Step 43, evaporation titanium/copper/titanium/gold, snakelike wire is obtained using photoetching development and wet etching method;
Step 44, the strata acid imide of spin coating one, dry, and are encapsulated whole device using photoetching development and wet etching method, Obtain by the resistance heater of polyimides coated metal line;
Step 45, polymethyl methacrylate is dissolved in acetone, resistance heater is transferred to water-soluble adhesive tape, be deposited with Upper titanium and silica.
In a further embodiment, in step 41, the thickness of polymethyl methacrylate is 100 nanometers, in step 42 The thickness of titanium and gold is respectively 5 nanometers and 50 nanometers, in step 43, and the thickness of titanium and copper is respectively 10 nanometers, 500 nanometers, 10 Nanometer and 20 nanometers, in step 45, the thickness of titanium and silica is respectively 5 nanometers and 30 nanometers.
In a further embodiment, the resistance of the serpentine resistive heater is 800 ~ 1200 ohm, preferably 1000 Ohm.
The design parameter of certain implementing process is as follows:
Mixed elastomer material gathers first(Dimethyl siloxane)Poly(dimethylsiloxane)40:1 and black Croci, using sol evenning machine on polyethylene terephthalate Poly (ethyleneterephlatate) supporting body Obtain 20 microns of black absorbing layer and dry.
Using with rectangular cylindrical array(The size of each post is 250 microns x250 microns)Area is 15 square centimeters PDMS seals, the heat for dipping in last layer or liquid becomes liquid-crystal ink and air-dries, and the thickness of the liquid crystal dots on last seal pillar is 25 microns.
Liquid crystal array is sticked up to come with heat release adhesive tape, and is attached on black absorbing layer, it is hot after temperature is increased to 90 DEG C Release adhesive tape will automatically disengage liquid crystal array, and now liquid crystal array is transferred on black absorbing layer.The elastomer of mixed transparent Material gathers(Dimethyl siloxane)Poly(dimethylsiloxane)40:1, and it is 30 microns to be spin-coated on thickness with sol evenning machine Protective clear layer is on liquid crystal array surface and dries.
By sol evenning machine by one layer of 100 polymethyl methacrylate poly (methylmethacrylate) of ran Be spin-coated on silicon chip surface and dry and continue one layer of polyimide film of spin coating and dry, herein on be deposited with titanium(5 nanometers)And gold (50 nanometers), the serpentine resistive heater that resistance is 1000 ohms is obtained by the method for photoetching development and wet etching, Titanium is deposited with herein(20 nanometers)Copper(500 nanometers)Titanium(10 nanometers)Gold(20 nanometers)And by photoetching development and wet etching Method obtain the snakelike wire and electrode of resistance very little, the strata acid imide polyimide of last spin coating one is dried and made again Whole device is encapsulated and is exposed with the method for photoetching development and wet etching and only electrode and is obtained by polyimides polyimide The resistance heater of coated metal line.
Electronic device is turned by dissolving polymethyl methacrylate poly (methylmethacrylate) in acetone Move on to the upper titanium of evaporation after water-soluble adhesive tape(5 nanometers)And silica(30 nanometers), activate black absorbing layer with UV ozone and carry on the back Behind face, by electronic device firmly transfer paste at the black protective layer back side, finally by welding by ultrathin flexible electrode install with The electrod assembly of detachable battery electrode matching
Fig. 2 a to Fig. 2 d are finally described:
As shown in Fig. 2 a to Fig. 2 d, the horizontal line in figure is 1 centimetre, and this product directly tightly can be fitted in above skin, As in wrist.Fig. 2 a are static maps, and 26x26 liquid crystal dots are had in figure, and diverse location liquid crystal dots are different due to its temperature, color Show some difference.Extract the colouring information of each liquid crystal dots(HSV colour models, Hue tones, Saturation saturation degrees, Value is worth), then these colouring informations are compared the database of the color corrected in advance and temperature relation with software, finally Automatically the Temperature numerical of each liquid crystal dots is exported as shown in Figure 2 b.This three dimensional temperature figure is just gem-pure to present wrist skin The distribution trend and temperature of vein blood vessel under skin, this can give medical personnel correct sign information.
In addition to static map, camera can be with the figure of continuous shooting dynamic change or continuously recording, therefore this product can be even Temperature change that continuous some vascular flows of monitoring cause in dynamic change judges health of heart etc..
As shown in Figure 2 c, after the black absorbing layer back side adds serpentine resistive heater, it is entered using detachable battery Row heating, heater can quickly raise 5-10 degrees Celsius, and the liquid crystal dots in face produce the change of color due to being heated on the heaters Change, medium temperature highest, then radiated to surrounding.If used on the skin of different moisture content, due to skin thermal conductivity not It is variant with the image that result in this radiating.After being taken pictures to this, counter can be released by the image for calculating and simulating radiating is made With the water content situation of skin.This product is monitored in skin care item industry, human body physical sign(Prevent dehydration in such as moving)In have Very big development potentiality.
Briefly introduce a kind of monitoring method:
Step 1. makes flexible liquid crystal temperature sensor according to the method described above;
Step 2. product is corrected:
Be placed in flexible liquid crystal temperature sensor on standard warm table by step 21., adjusts lighting condition, by camera and red The outside line imager surface in the flexible liquid crystal temperature sensor placed side by side;
Step 22. is heated to standard of closure warm table after preset temperature, and the camera shoots product according to pre-set velocity Photo, infrared be taken the temperature change in region according to predetermined speed record into line imaging instrument while described;
Step 23. Extracting temperature often changes pictorial information during preset temperature point, obtains the color letter of each temperature spot Breath, the colouring information includes the color and luster and saturation value in hsv color space;
Step 24. is fitted the relation for setting up C&T by two-dimensional linear, makes the combination of any color and luster and saturation degree Numerical value is corresponding with Temperature numerical;
Step 3. skin temperature IMAQ:The flexible liquid crystal sensor is placed in position to be measured, is shot using camera Picture;
The treatment of step 4. pictorial information, carries out following process successively:Noise is reduced by Gaussian Blur, picture is changed Into gray-scale map, adaptive threshold control removes the spot in image, then expand pixel bright spot by extending by erosion arithmetic To original size, the profile of data point is extracted, position the coordinate of each data and extract colouring information by closing circle algorithm;
Step 5. obtains the temperature data of each point according to the corresponding relation of color and temperature digital.
In a further embodiment, step 4 is specially:
S41. pictorial information is read:The variable of incoming mat types, reads head, view data size and the data of image Body, the data volume is two dimension or one-dimension array;
S42. the disposal of gentle filter, to each pixel, is all passed through by other pixel values in itself and neighborhood and added Obtained after weight average, specially with each pixel in a template scan image, with pixel in the neighborhood of template determination Weighted average gray value goes the value of alternate template central pixel point;
S43. by the color space of transition diagram picture, picture is converted into gray scale picture;
S44. it is " 0 " to use adaptive threshold method to divide the image into gray value(Black)" 255 "(White)'s Image;
S45. morphological operation, including corrosion and expansive working are carried out:Image is rolled up with the kernel of arbitrary shape Product,
When expansive working is carried out, kernel streaks image, and just the max pixel value of kernel overlay area is proposed, and is replaced The pixel of core center point position;When etching operation is carried out, kernel streaks image, by the minimum pixel value of kernel overlay area Extract, and replace the pixel of anchor point position;
S46. the profile of each point is found:Profile is extracted, adoptable method includes only extracting outermost profile, carries All profiles are taken, and is positioned in list, extract all profiles, and be organized as two-layer, top layer is the periphery of connected region Border, sublevel is the inner boundary in hole, extracts all profiles, and reconstruct nested profile;Approach method, the output profile of chain code, Other method exports polygon, by point sequence form is a little translated as by chain code form, compression level, vertical and diagonal point Cut, retain the pixel of end, using The-Chin chain approximate algorithms, used by the horizontal fragment for being connected as 1 entirely different Contours extract algorithm;
S47. profile is drawn, the set of contours of target image is input into, each set of contours is made up of point vector, draw profile, If profile parameters are negative value, whole profiles are drawn, draw color, line width and the line style of profile;
S48. calculate the smallest circle of the existing profile of encirclement and draw circle;
S49. the average HSV value of color in each circle is calculated;
S50. each circular corresponding Temperature numerical of HSV value is assigned;
S51. three dimensional temperature image is drawn.
In a word:
1. accuracy of the invention and time and space resolution ratio can reach the standard close to infrared temperature imager (± 0.05 °C, 30 milliseconds, 0.5 millimeter), the accuracy of much existing similar products(±0.6℃), and cost is substantially reduced (100000 yuan to 10 yuan).Because substrate material layer is very thin(20 microns)And product and skin are tightly fitted, heat becomes liquid Fast reaction of the brilliant material after temperature change(30 milliseconds)Help the fluctuation of monitor in real time ambulatory skin temperature.
2. due to its ultra-thin thickness(50 microns)With remarkable mechanical property(Young's modulus test is 178,000 Handkerchief), one, this product can realize extraordinary gas permeability, dress three hours of this product after skin without any temperature fluctuate With the change of water content, compared with the performance of existing product poor air permeability, this product wearing comfort degree there has also been very big carrying Height, is suitable for worn for long periods.2nd, it can closely be fitted in skin surface using the model ylid bloom action power of itself, no matter skin The features such as skin has non-wrinkled bending.
3., by changing the density of liquid crystal array, the present invention can reach spatial resolution very high, each liquid crystal dots Temperature information can be extracted individually, and the temperature change that skin is separated by between millimeter in use can be measured easily Out.
4. by connecting detachable battery part heating resistor, its temperature is improved more than 5 °C.By observing this Focus changes to the color image that surrounding radiates, and we can learn the thermal conductivity and water content of skin by calculating.
5. the data acquisition of this product is simple, it is only necessary to the photo of shooting clear, just can be quickly with reference to software calculating Mapping skin temperature profile, this is significant to future products exploitation volume production.
In brief, this product can realize the skin temperature imaging of low-cost and high-performance, and data acquisition can be by hand The photograph of machine and calculate is realized.This very more than existing product innovation will will also have bigger application space.
By foregoing description:This product in medical industries has very big potentiality.Surveyed and drawn by skin temperature, can With vessel information under accurately detecting skin, moisture content of skin is calculated, infer heart working situation, it is possible to which long term monitoring wound is healed The situation of conjunction(Healing progress from the point of view of temperature change, whether there is infection etc.), arterial-venous position and arteries direction of flow of blood With speed, or the skin histology temperature change that monitoring DVT or myalgia cause.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned implementation method Detail, in range of the technology design of the invention, various equivalents can be carried out to technical scheme, this A little equivalents belong to protection scope of the present invention.It is further to note that described in above-mentioned specific embodiment Each particular technique feature, in the case of reconcilable, can be combined by any suitable means.In order to avoid not Necessary repetition, the present invention is no longer separately illustrated to various possible combinations.

Claims (2)

1. a kind of preparation method of flexible liquid crystal temperature sensor, it is characterised in that comprise the following steps:
Step 1, elastomeric material is mixed with black oxidation iron powder, with sol evenning machine, painting black absorbed layer is simultaneously on loading plate Dry;
Step 2, upper heat dipped in the seal with columnar arrays become and liquid-crystal ink liquid and air-dry,
Step 3, with heat gluing liquid crystal array of release, and be affixed on the one side of the black absorbing layer, rise high-temperature, make hot release Glue departs from liquid crystal array, with sol evenning machine in one layer of layer of elastomer material of liquid crystal array side spin coating;
Step 4, resistance heating layer is prepared, and transfer them to the another side of black absorbing layer;
The detailed process that resistance heating layer is prepared in the step 4 is:
Step 41, with sol evenning machine in the strata methyl methacrylate of silicon chip surface spin coating one, dry, continue spin coating one strata acyl sub- Amine, dries;
Step 42, evaporation titanium and gold, serpentine resistive heater is obtained using photoetching development and wet etching method;
Step 43, successively evaporation titanium, copper, titanium, gold, snakelike wire and electrode are obtained using photoetching development and wet etching method;
Step 44, the strata acid imide of spin coating one, dry, and are encapsulated whole device using photoetching development and wet etching method, obtain By the resistance heater of polyimides coated metal line;
Step 45, polymethyl methacrylate is dissolved in acetone, resistance heater is transferred to water-soluble adhesive tape, titanium on evaporation And silica;
In step 41, the thickness of polymethyl methacrylate is 100 nanometers, and the thickness of titanium and gold is respectively 10 nanometers in step 42 With 50 nanometers, in step 43, titanium, copper, titanium, gold thickness be respectively 10 nanometers, 500 nanometers, 10 nanometers and 20 nanometers, step 45 In, the thickness of titanium and silica is respectively 5 nanometers and 30 nanometers.
2. the preparation method of flexible liquid crystal temperature sensor as claimed in claim 1, it is characterised in that the serpentine resistive adds The resistance of hot device is 800~1200 ohm.
CN201510575522.9A 2015-09-10 2015-09-10 Flexible liquid crystal temperature sensor and preparation method Expired - Fee Related CN105078419B (en)

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CN109567908B (en) * 2018-12-28 2021-11-02 复旦大学附属中山医院 Venipuncture system based on temperature field detection
DE102019121927A1 (en) * 2019-05-23 2020-11-26 automation & software Günther Tausch GmbH Sensor layer for determining temperature profiles on a skin surface, aids for application to a skin surface, method for producing an aid and method for determining a relative temperature difference on a skin surface

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US3852092A (en) * 1972-06-05 1974-12-03 J Patterson Thermally responsive elastic membrane
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