CN111060218A - Body temperature measuring device and measuring method - Google Patents
Body temperature measuring device and measuring method Download PDFInfo
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- CN111060218A CN111060218A CN201911324276.4A CN201911324276A CN111060218A CN 111060218 A CN111060218 A CN 111060218A CN 201911324276 A CN201911324276 A CN 201911324276A CN 111060218 A CN111060218 A CN 111060218A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/20—Clinical contact thermometers for use with humans or animals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/20—Compensating for effects of temperature changes other than those to be measured, e.g. changes in ambient temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
Abstract
The invention relates to a body temperature measuring device and a measuring method, wherein the body temperature measuring device comprises a main body part, the main body part comprises a first temperature sensor, a first heating device, a heat insulation layer, a second temperature sensor and a second heating device, the first temperature sensor, the first heating device, the heat insulation layer, the second temperature sensor and the second heating device are sequentially arranged; a third temperature sensor disposed outside the body portion coverage; and the controller is respectively connected with the first temperature sensor, the first heating device, the second temperature sensor, the second heating device and the third temperature sensor. The invention is based on zero heat flow temperature measurement, and accelerates thermal compensation by calibrating the temperature sensor, so that the system quickly reaches thermal balance, and the temperature measurement precision is further improved.
Description
Technical Field
The invention relates to the technical field of measuring instruments, in particular to a body temperature measuring device and a body temperature measuring method.
Background
Body temperature parameters are important indicators for health. The monitoring of the body temperature is particularly important in the stages of cold and fever, hospitalization for illness, postoperative rehabilitation, pregnancy of women and the like.
The hospital operation occasion uses an invasive temperature monitoring mode to insert a thermometer into the rectum, the pulmonary artery and the like of a human body for measurement, and is not suitable for daily use although accurate. Non-invasive measurement methods include infrared thermometry, ultrasound, thermal flow, etc.; the infrared temperature measurement is easily interfered by the environment, and the relative precision of the ultrasonic measurement method is not high, and the method is not suitable for long-term monitoring. The existing heat flow method compares the temperatures of two sensors by a comparison method to perform feedback control heating, and the control has hysteresis, is not accurate enough, causes large heating error and finally causes large measurement error.
Disclosure of Invention
Therefore, it is necessary to provide a body temperature measuring device and a body temperature measuring method to accurately measure body temperature, aiming at the problem of low precision of the existing body temperature measuring device.
A body temperature measuring device comprises a main body part, wherein the main body part comprises a first temperature sensor, a first heating device covering the first temperature sensor, a heat insulation layer, a second temperature sensor and a second heating device covering the second temperature sensor which are sequentially arranged;
a third temperature sensor disposed outside the body portion coverage;
and the controller is respectively connected with the first temperature sensor, the first heating device, the second temperature sensor, the second heating device and the third temperature sensor.
Above-mentioned body temperature measuring device, the temperature calibration that measures through the third temperature sensor all the other temperature sensors to carry out thermal compensation through first heating device and second heating device, can make the system reach thermal balance fast, realize the zero thermal current temperature measurement of ideal, it is higher to the measurement accuracy of body temperature.
Preferably, the body temperature measuring device further comprises a first flexible circuit board, the first flexible circuit board comprises a head part and a tail part extending from the head part, the controller is arranged at the head part, one end of the tail part is connected with the head part, and the other end of the tail part is connected with the third temperature sensor.
The third temperature sensor is combined with the first flexible circuit board, so that the number of connecting devices of the measuring device is reduced, and the structure is more compact.
Preferably, the body temperature measuring device further comprises a second flexible circuit board, and the first heating device and the first temperature sensor are connected with the controller through the second flexible circuit board;
and/or;
the body temperature measuring device also comprises a third flexible circuit board, and the second heating device and the second temperature sensor are connected with the controller through the third flexible circuit board.
Specifically, the first heating device and the first temperature sensor are arranged on one side of the second flexible circuit board.
Specifically, the second heating device and the second temperature sensor are arranged on one side of the third flexible circuit board.
Specifically, a first heating device and a first temperature sensor are arranged in the middle of a second flexible circuit board, a hollow part is reserved in the middle of the second flexible circuit board, and the size of the hollow part is matched with that of the first heating device and the first temperature sensor, so that the first heating device and the first temperature sensor can be embedded into the middle of the second flexible circuit board.
Specifically, the second heating device and the second temperature sensor are arranged in the middle of the third flexible circuit board, a hollow part is reserved in the middle of the third flexible circuit board, and the size of the hollow part is matched with that of the second heating device and the second temperature sensor, so that the second heating device and the second temperature sensor can be embedded in the middle of the third flexible circuit board.
The heating device, the temperature sensor and the flexible circuit board are matched in shape, so that the whole device is more compact in structure.
Preferably, the body temperature measuring device further comprises a communication module, the communication module is integrated on the first flexible circuit board and connected with the controller, and the communication module is used for transmitting the body temperature measuring data and the mobile terminal.
Preferably, the body temperature measuring device further comprises a wireless charging module and a flexible thin film battery, and the wireless charging module and the flexible thin film battery are integrated on the first flexible circuit board and used for supplying power to the device.
The body temperature measurement data can be displayed on the mobile terminal, so that the body temperature data can be monitored more conveniently, and the aim of remotely monitoring weak people such as patients, old people and children in real time is fulfilled.
Preferably, the body temperature measuring device is wrapped with a heat insulating material except for portions of the first temperature sensor and the third temperature sensor that are in contact with the skin.
A method of body temperature measurement comprising the steps of:
acquiring skin temperature measured by a first temperature sensor positioned on the surface of the skin, and blocking heat flow on the surface of the skin where the measurement is performed by a first heating device;
acquiring the heating temperature measured by the second temperature sensor, and blocking the heat flow on the surface of the skin at the second temperature sensor by the second heating device;
acquiring the temperature of the armpit measured by a third temperature sensor;
if the armpit temperature rising rate is larger than a set threshold value, the first heating device and the second heating device respectively heat the first temperature sensor and the second temperature sensor;
if the armpit temperature rising rate is smaller than the set threshold, the first heating device stops heating, and the second heating device continues heating;
when the skin temperature and the heating temperature are balanced, the skin temperature is equal to the heating temperature, and the skin temperature is the body temperature which is finally measured.
According to the body temperature measuring method, the thermal compensation is accelerated by calibrating the temperature sensor, so that the system quickly reaches thermal balance, and the body temperature measuring accuracy is higher.
Preferably, the first heating means stops heating if the rate of rise of the underarm temperature is less than a set threshold and the state less than the set threshold remains outside a set time range.
Preferably, after the first heating device stops heating, if the skin temperature is lower than the underarm temperature, the heating power of the second heating device is controlled by taking the underarm temperature as a standard; otherwise, the heating power of the second heating device is controlled by taking the skin temperature as a standard.
Preferably, the heating powers of the first heating device and the second heating device are regulated by a PID control method.
Drawings
FIG. 1 is a schematic view of a thermometer;
FIG. 2 is a schematic diagram of a thermometer based on the zero heat flow principle;
FIG. 3 is a flow chart of a method of body temperature measurement in one embodiment;
FIG. 4 is a schematic view of a body temperature measurement device in one embodiment;
FIG. 5 is a schematic view of a first flexible circuit board of the body temperature measurement device in one embodiment;
FIG. 6 is a schematic view of a second flexible circuit board of the body temperature measurement device in one embodiment;
figure 7 is a flow diagram of a method of body temperature measurement in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the terms "first \ second \ third" related to the embodiments of the present invention are merely used for distinguishing similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence order if allowed. It should be understood that the terms first, second, and third, as used herein, are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or otherwise described herein.
The terms "comprises" and "comprising," and any variations thereof, of embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or (module) elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
According to the second law of thermodynamics it is not possible to transfer heat from a low temperature object to a high temperature object without causing other changes. Heat may be transferred spontaneously from a hotter object to a cooler object, but may not be transferred spontaneously from a cooler object to a hotter object.
Referring to fig. 1, a thermometer is shown with a temperature sensor 103 for measuring the temperature of the skin 102 of a person and a thermal insulating layer 104 for preventing heat loss from the person to the external environment. When the thermal insulation layer 104 completely blocks the surface of the skin of the human body from radiating heat under ideal conditions, the heat can be transferred from the inside of the human body to the skin because the temperature of the core 101 of the human body is higher than the temperature of the skin. Likewise, heat from the skin 102 is also transferred to the temperature sensor 103 placed on the skin. When the heat is balanced, the core temperature equals the skin temperature to the temperature measured by the temperature sensor 103.
The thermometer shown in fig. 1 is improved because complete thermal insulation cannot be achieved, and the thermometer based on the zero heat flow principle shown in fig. 2 comprises a temperature sensor 202 and a thermal insulation layer 204, and a heating device 201 and a temperature sensor 203 are added to compensate the temperature, namely the core temperature is equal to the skin temperature, equal to the temperature of the temperature sensor 202 and equal to the temperature of the temperature sensor 203 when thermal equilibrium is reached. The disadvantage is that the heating is feedback controlled by comparing the temperatures of the two sensors by a comparison method. Such control has hysteresis, is not precise enough, leads to large heating errors, eventually to large measurement errors, and the whole process of reaching thermal equilibrium is time consuming.
The embodiment provides a body temperature measuring device, improves on the basis of zero heat flow temperature measurement for temperature measurement's precision is higher.
The body temperature measuring device comprises a main body part, wherein the main body part comprises a first temperature sensor, a first heating device covering the first temperature sensor, a heat insulation layer, a second temperature sensor and a second heating device covering the second temperature sensor which are sequentially arranged;
a third temperature sensor disposed outside the body portion coverage;
and the controller is respectively connected with the first temperature sensor, the first heating device, the second temperature sensor, the second heating device and the third temperature sensor.
Above-mentioned body temperature measuring device, the temperature calibration that measures through the third temperature sensor all the other temperature sensors to carry out thermal compensation through first heating device and second heating device, can make the system reach thermal balance fast, realize the zero thermal current temperature measurement of ideal, it is higher to the measurement accuracy of body temperature.
Preferably, the controller may be connected to the first temperature sensor, the first heating device, the second temperature sensor, the second heating device and the third temperature sensor in a wired or wireless manner. Specifically, wired connection may be adopted entirely, or wireless connection may be adopted entirely, or partial wired connection and partial wireless connection may be adopted, and the connection mode may be selected in various ways according to specific needs. If the connection is wired, flexible wire connection, irregular wiring or snake-shaped wiring and the like can be adopted. If the wireless connection is adopted, a signal sending end and a signal receiving end are respectively arranged between different devices.
Preferably, the controller is disposed on the first flexible circuit board. The Flexible circuit board (FPC for short) has the good characteristics of light weight, thin thickness, free bending and folding and the like, can make the body temperature measuring device lighter and thinner by using the Flexible circuit board, has flexibility, and is convenient for a user to wear. The FPC board generally uses mylar, polyimide, or the like as a base material, and any one of them may be used specifically, but this embodiment is not limited thereto.
Specifically, the controller may adopt an operation control device such as an MCU or an FPGA. The controller can be mounted on the FPC circuit board by means of a patch. In consideration of different structural arrangements, the first flexible circuit board can be a large flexible circuit board or a flexible circuit board coupling body formed by mutually connecting and integrating a plurality of relatively small flexible circuit boards, the FPC circuit board comprises a flat cable interface, and interconnection among different FPC circuit boards can be realized through flexible FPC flexible flat cables and the flat cable interface.
In one embodiment, the first flexible circuit board includes a head portion and a tail portion extending from the head portion, the controller is disposed at the head portion, the head portion is rectangular (this need not be the case), the tail portion is elongated, and one end of the tail portion is connected to the head portion and the other end is connected to the third temperature sensor. The third temperature sensor is used for measuring the skin temperature at a position except the body temperature measuring point and transmitting the measured skin temperature data to the controller for processing. In the embodiment, the third temperature sensor is combined with the first flexible circuit board, so that the number of connecting devices of the measuring device is reduced, and the structure is more compact.
Preferably, the body temperature measuring device further comprises a power module for supplying power to the device. The power supply module comprises a battery and a charging module, wherein the battery can adopt a flexible thin film lithium battery and the like; the charging module can be used for realizing wired charging or wireless charging.
Preferably, the body temperature measuring device further comprises a display module. The display module can be a small-sized LED display screen and can display measured human body temperature data in real time.
Preferably, the body temperature measuring device further comprises a communication module. The communication module can adopt a Bluetooth device, and the body temperature measuring device transmits data to the data receiving end through Bluetooth after collecting the human body temperature data. The data receiving end is not limited to sports bracelets, personal computers, smart phones, tablets, and other devices.
In order to monitor the human body temperature data in real time more conveniently, for example, the remote real-time monitoring is carried out on weak people such as patients, old people and children, the measured human body temperature data can also be uploaded to a server and then displayed on a corresponding mobile terminal in a remote mode, and the mobile terminal can be provided with a corresponding client side for data display and interaction. Clients described herein include, but are not limited to, applications running on personal computers, smart phones, tablets, and other smart devices, and the like. The mobile terminal can access a public network such as an Internet network and the like in a wired or wireless mode and communicate with the server. The mobile terminal can be used for operating communication tools such as a browser and various communication clients and web page access tools, and the user can access the server through the internet network by using the browser and the clients to read the human body temperature data. The server refers to a server device that implements various background functions, and in consideration of the actual situation handled by the server at present, the device referred to herein may also refer to a device or a cluster of multiple devices. The mode of current body temperature measurement mostly uses artifical timing measurement as the main, wastes time and energy and can not do real time monitoring, and this embodiment can realize the real time monitoring to body temperature through adding communication module, and is convenient nimble more.
Specifically, the power module, the communication module and the display module can be partially or completely integrated on the first flexible circuit board, so that the body temperature measuring device is smaller in size. For example: the communication module can be integrated on the first flexible circuit board, is connected with the controller and is used for transmitting the body temperature measurement data and the mobile terminal; the power module may include a wireless charging module and a flexible thin film battery integrated on the first flexible circuit board for powering the device.
In one embodiment, the first heating means is arranged to heat a portion of the first temperature sensor, and in use, the first heating means overlies the first temperature sensor. Preferably, the first heating device and the first temperature sensor are connected with the second flexible circuit board, and the first heating device and the first temperature sensor are connected with the controller through the second flexible circuit board.
In one embodiment, the second heating means is arranged to heat a portion of the second temperature sensor, and in use, the second heating means overlies the second temperature sensor. Preferably, the second heating device and the second temperature sensor are connected with a third flexible circuit board, and the second heating device and the second temperature sensor are connected with the controller through the third flexible circuit board.
Specifically, the heating device and the temperature sensor may be disposed on one side of the flexible circuit board, or may be disposed in the middle of the flexible circuit board. For example, the first heating device and the first temperature sensor are arranged on the second flexible circuit board side; the second heating device and the second temperature sensor are disposed on the third flexible circuit board side.
In one embodiment, when the heating device and the temperature sensor are arranged on one side of the flexible circuit board, the heating device and the temperature sensor can be simply placed on one side of the flexible circuit board; or when the heating device and the temperature sensor are arranged on one side of the flexible circuit board, the flexible circuit board can be provided with a recess which is matched with the arrangement of the heating device and the temperature sensor.
In one embodiment, when the heating device and the temperature sensor are arranged in the middle of the flexible circuit board, a hollow part needs to be reserved in the middle of the flexible circuit board, and the size of the hollow part is matched with that of the heating device and the temperature sensor, so that the heating device and the temperature sensor can be just embedded in the middle of the flexible circuit board. The flexible circuit board may be rectangular, circular, irregular, etc.
Specifically, a first heating device and a first temperature sensor are arranged in the middle of a second flexible circuit board, a hollow part is reserved in the middle of the second flexible circuit board, and the size of the hollow part is matched with that of the first heating device and the first temperature sensor, so that the first heating device and the first temperature sensor can be embedded into the middle of the second flexible circuit board.
Specifically, the second heating device and the second temperature sensor are arranged in the middle of the third flexible circuit board, a hollow part is reserved in the middle of the third flexible circuit board, and the size of the hollow part is matched with that of the second heating device and the second temperature sensor, so that the second heating device and the second temperature sensor can be embedded in the middle of the third flexible circuit board.
The heating device, the temperature sensor and the flexible circuit board are matched in shape, so that the whole device is more compact in structure; the three can be approximately positioned on the same plane as much as possible; the above are not essential and can be flexibly adjusted according to requirements.
Preferably, the heating device adopts a flexible heating film.
Preferably, the temperature sensor is a thermistor, and particularly, an NTC negative temperature coefficient thermistor is used. The thermistor is externally provided with a metal heat conduction cap structure to form a constant temperature cavity, so that the fluctuation of the temperature of the sensor is reduced. The temperature conduction speed is accelerated in the constant temperature cavity through the graphite heat conduction material. The metal material may be a material having relatively high thermal conductivity such as silver or copper.
The whole device adopts a flexible structure design, has good ductility and is suitable for being stuck on the skin of a human body.
In one embodiment, the second and third flexible circuit boards are arranged in a vertically overlapping manner.
In one embodiment, the first, second and third flexible circuit boards are arranged to coincide in a vertical direction. And a heat insulation layer is arranged between the two layers of flexible circuit boards to prevent heat transfer. The heat insulation layer can adopt a flexible heat insulation film.
Preferably, the second heating device, the second temperature sensor and the third flexible circuit board are regarded as a layer structure, the first heating device, the first temperature sensor and the second flexible circuit board are regarded as a layer structure, the first flexible circuit board and related devices connected with the first flexible circuit board are regarded as a layer structure, and different layer structures are fixedly connected, for example, different layer structures can be pasted together to play a role in fixing the structure.
Preferably, the body temperature measuring device is wrapped with a heat insulating material, in addition to the portions of the first and third temperature sensors that are in contact with the skin, for further heat insulation to improve the accuracy of temperature measurement. Specifically, the heat insulation material is silica gel, and the medical adhesive plaster is attached to the silica gel and can be tightly contacted with the skin of a human body, so that heat loss is reduced.
Above-mentioned body temperature measuring device adopts flexible design, and the circuit board adopts flexible FPC, heater to adopt flexible heating film for example, makes whole device have good ductility, is fit for as wearable equipment, the skin of laminating human body.
The body temperature measuring device heats the temperature sensor by adding the heating device, the temperature sensor is added to measure the temperature of the armpit of the human body, and the dynamic heating is carried out by taking the temperature of the armpit of the human body as the temperature regulation standard. By heating the two temperature sensors in the zero heat flow model, the time for heat balance can be accelerated, and the measurement error can be reduced.
The present embodiment provides a body temperature measurement method, as shown in fig. 3, including the following steps:
s110, acquiring skin temperature measured by a first temperature sensor positioned on the surface of skin, and blocking heat flow on the surface of the skin where the skin is measured by a first heating device;
s120, acquiring the heating temperature measured by the second temperature sensor, and blocking the heat flow on the surface of the skin at the second temperature sensor through the second heating device;
s130, acquiring the temperature of the armpit measured by the third temperature sensor;
s140, if the armpit temperature rising rate is larger than a set threshold value, the first heating device and the second heating device respectively heat the first temperature sensor and the second temperature sensor;
s150, if the armpit temperature rising rate is smaller than a set threshold value, the first heating device stops heating, and the second heating device continues heating;
s160, when the skin temperature and the heating temperature are balanced, the skin temperature is equal to the heating temperature, and the skin temperature is the finally measured body temperature.
According to the body temperature measuring method, the thermal compensation is accelerated by calibrating the temperature sensor, so that the system quickly reaches thermal balance, and the body temperature measuring accuracy is higher.
Preferably, the first heating means stops heating if the rate of rise of the underarm temperature is less than a set threshold and the state less than the set threshold remains outside a set time range. The first heating device stops heating, which means that the rapid temperature rise process in the first stage is completed, and then the more detailed thermal compensation adjustment in the second stage is performed, so as to accelerate the process of thermal equilibrium.
Preferably, after the first heating device stops heating, if the skin temperature is lower than the underarm temperature, the heating power of the second heating device is controlled by taking the underarm temperature as a standard; otherwise, the heating power of the second heating device is controlled by taking the skin temperature as a standard. The underarm temperature can be continuously given to the zero heat flow model by a calibration temperature, so that the precision of the subsequent whole measurement process is higher.
Preferably, the heating powers of the first heating device and the second heating device are regulated by a PID control method.
A preferred embodiment is described in detail below.
A body temperature measuring device is improved on the basis of zero heat flow temperature measurement. All circuits and components are packaged together, suitable for wearable applications. Referring to fig. 4, the body temperature measuring device includes a temperature sensor T1, a temperature sensor T2, and a temperature sensor T3, and further includes a film heating sheet H1 and a film heating sheet H2. The film heater chip H1 is used to heat the temperature sensor T1, and the film heater chip H2 is used to heat the temperature sensor T2. In the figure, F1, F2, and F3 are polyimide flexible circuit boards (FPCs), and have 3 layers in total. G1 and G2 are flexible thin film polyurethane foam heat insulation materials, after glue is coated on the flexible thin film polyurethane foam heat insulation materials, the three layers of FPC circuit substrates, namely the circuit substrate F1, the circuit substrate F2 and the circuit substrate F3, are bonded together, and the flexible thin film polyurethane foam heat insulation materials play a role in structural fixing and heat insulation. L1 and L2 are flexible FPC flexible flat cables which are used as electrical connecting leads between FPC circuit boards. The FPC connector is 5016162575 of MOLEX company. The silica gel heat-insulating material U1 prevents the heat loss on the skin surface, isolates the influence of external environment to whole sensor, and prevents the lateral heat loss when temperature sensor T3 temperature is gathered.
F1 is the main circuit substrate part, as shown in fig. 5, it includes flexible thin film lithium battery B1, patch electronic control circuit C1, temperature sensor T3, wireless charging module W1, bluetooth antenna module a1, FPC cable interface J1 and FPC cable interface J2; the flexible thin film lithium battery B1 supplies power to the whole circuit, so that the device has good ductility; the battery is charged in a wireless manner. After the system collects the data, the data is sent to the host through the Bluetooth, and the purpose of real-time monitoring is achieved.
F2 is an auxiliary circuit board 1, as shown in fig. 6, which includes a temperature sensor T1, a thin film heater sheet H1, and an FPC bus interface J3; f3 is an auxiliary circuit board 2 including a temperature sensor T2 and a thin film heater chip H2.
The temperature sensor adopts NTC negative temperature coefficient thermistor, such as NCP03 WF; the thermistor is externally provided with a metal heat conduction cap structure to form a constant temperature cavity, so that the fluctuation of the temperature of the sensor is reduced. The temperature conduction speed is accelerated in the constant temperature cavity through the graphite heat conduction material. The metal material may be a material having relatively high thermal conductivity such as silver or copper.
The whole device adopts a flexible structure design, has good ductility and is suitable for being stuck on the skin of a human body.
When the temperature of the human body is measured, the medical adhesive tape is firstly adhered to the bottom of the temperature measuring device, so that the temperature measuring device can be in close contact with the skin of the human body through the adhesive tape, and heat loss is reduced. The main body part of the temperature measuring device is attached to the chest, the temperature sensor T3 is attached to the armpit, and the probe of the temperature sensor T3 is clamped through the armpit.
The temperature measurement process comprises (see fig. 7):
in stage one, a closed environment is created under the armpit and the temperature sensor T3 rapidly heats up. The temperature rise rates of the temperature sensor T1 and the temperature sensor T2 probe are much smaller than the temperature rise rate of the temperature sensor T3. And simultaneously and quickly acquiring the temperatures of the temperature sensor T1, the temperature sensor T2 and the temperature sensor T3. The temperature of the temperature sensor T3 is taken as the standard temperature T. The PID dynamically updates and continuously adjusts relevant heating parameters, such as heating power, heating time and the like, by controlling the heating of the film heating sheet H1 and the film heating sheet H2 through the PID. Parameters of PID regulation control in the figure: p is proportional, I is integral, and D is derivative. According to experimental data, the temperature of the temperature sensor T3 can be raised to 0.5-1 ℃ lower than the core temperature of the human body within 1-2 minutes, and the temperature rising trend is slow. If the temperature rise gradient of the temperature sensor T3 is less than 0.03 ℃/s, the temperature rise gradient of the temperature sensor T3 is less than 0.03 ℃/s, the state lasts for more than one minute, and the temperature of the temperature sensor T3 is greater than 32 ℃, the process enters a second stage, and the film heating sheet H1 is not heated any more.
In the second stage, by comparing the temperatures sampled by the temperature sensor T1 and the temperature sensor T2, the temperature of the temperature sensor T2 is compensated by heating the thin film heater chip H2, and a thermal equilibrium is established. The software continues to measure the temperature of the temperature sensor T3 and if the armpit continues to clamp, continues to give the zero heat flow model a calibrated temperature, which allows for greater accuracy in the subsequent overall measurement process. The temperature under the armpit can be used as the PID temperature regulation standard temperature in the first-stage quick temperature rise stage, and can also be used as the temperature calibration of the second-stage slow compensation.
Specifically, in the second stage, the temperatures of the temperature sensor T1, the temperature sensor T2 and the temperature sensor T3 are continuously acquired, if the temperature of the temperature sensor T3 is greater than the temperature of the temperature sensor T1, the temperature of the temperature sensor T3 is used as a standard temperature, otherwise, the temperature of the temperature sensor T1 is used as a standard temperature; and (3) controlling the heating of the film heating sheet H2 by PID until the temperatures of T1 and T2 reach dynamic thermal equilibrium, wherein the temperature of T1 is equal to the temperature of T2, and the temperature of T1 is the finally measured body temperature.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. A body temperature measuring device is characterized by comprising a main body part, wherein the main body part comprises a first temperature sensor, a first heating device covering the first temperature sensor, a heat insulation layer, a second temperature sensor and a second heating device covering the second temperature sensor which are sequentially arranged;
a third temperature sensor disposed outside of the body portion coverage;
and the controller is respectively connected with the first temperature sensor, the first heating device, the second temperature sensor, the second heating device and the third temperature sensor.
2. The body temperature measurement device of claim 1, further comprising a first flexible circuit board including a head portion and a tail portion extending from the head portion, wherein the controller is disposed at the head portion, and wherein the tail portion is connected to the head portion at one end and to the third temperature sensor at the other end.
3. The body temperature measurement device of claim 1, further comprising a second flexible circuit board, wherein the first heating device and the first temperature sensor are connected to the controller via the second flexible circuit board;
and/or;
the body temperature measuring device further comprises a third flexible circuit board, and the second heating device and the second temperature sensor are connected with the controller through the third flexible circuit board.
4. A body temperature measuring device according to claim 3, wherein the first heating means and the first temperature sensor are arranged on the side of the second flexible circuit board.
5. A body temperature measuring device according to claim 3, wherein the second heating means and the second temperature sensor are arranged on the side of the third flexible circuit board.
6. The body temperature measuring device according to claim 4, wherein the first heating device and the first temperature sensor are arranged in the middle of the second flexible circuit board, a hollow part is reserved in the middle of the second flexible circuit board, and the size of the hollow part is matched with that of the first heating device and the first temperature sensor, so that the first heating device and the first temperature sensor can be embedded in the middle of the second flexible circuit board.
7. The body temperature measuring device according to claim 5, wherein the second heating device and the second temperature sensor are arranged in the middle of the third flexible circuit board, a hollow part is reserved in the middle of the third flexible circuit board, and the size of the hollow part is matched with that of the second heating device and the second temperature sensor, so that the second heating device and the second temperature sensor can be embedded in the middle of the third flexible circuit board.
8. The body temperature measuring device of claim 2, further comprising a communication module integrated on the first flexible circuit board and connected to the controller for transmitting body temperature measurement data to a mobile terminal.
9. The body temperature measurement device of claim 2, further comprising a wireless charging module and a flexible thin film battery integrated on the first flexible circuit board for powering the device.
10. The body temperature measurement device of claim 1, wherein the body temperature measurement device is wrapped with a heat insulating material except for portions of the first and third temperature sensors that are in contact with the skin.
11. A method of measuring body temperature, comprising the steps of:
acquiring skin temperature measured by a first temperature sensor positioned on the surface of the skin, and blocking heat flow on the surface of the skin where the measurement is performed by a first heating device;
acquiring the heating temperature measured by the second temperature sensor, and blocking the heat flow on the surface of the skin at the second temperature sensor by the second heating device;
acquiring the temperature of the armpit measured by a third temperature sensor;
if the armpit temperature rising rate is larger than a set threshold value, the first heating device and the second heating device respectively heat the first temperature sensor and the second temperature sensor;
if the armpit temperature rising rate is smaller than the set threshold value, the first heating device stops heating, and the second heating device continues heating;
when the skin temperature and the heating temperature are balanced, the skin temperature is equal to the heating temperature, and the skin temperature is the finally measured body temperature.
12. The method of claim 11, wherein the first heating device stops heating if the rate of the axillary temperature increases is less than a set threshold and the state below the set threshold remains outside a set time range.
13. The method for measuring body temperature according to claim 11, wherein after the first heating means stops heating, if the skin temperature is lower than the underarm temperature, the heating power of the second heating means is controlled based on the underarm temperature; otherwise, controlling the heating power of the second heating device by taking the skin temperature as a standard.
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