CN107647853A - A kind of portable high-precision electronic clinical thermometer - Google Patents
A kind of portable high-precision electronic clinical thermometer Download PDFInfo
- Publication number
- CN107647853A CN107647853A CN201710937460.0A CN201710937460A CN107647853A CN 107647853 A CN107647853 A CN 107647853A CN 201710937460 A CN201710937460 A CN 201710937460A CN 107647853 A CN107647853 A CN 107647853A
- Authority
- CN
- China
- Prior art keywords
- resistance
- chip microcomputer
- clinical thermometer
- pin
- precision electronic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0204—Operational features of power management
- A61B2560/0209—Operational features of power management adapted for power saving
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
The invention discloses a kind of portable high-precision electronic clinical thermometer, including shell, it is connected to the temperature sensor of shell one end and is arranged on the control system of shell inner cavity；The control system includes single-chip microcomputer, the LCD display being electrically connected with respectively with single-chip microcomputer, power module, input keyboard, bluetooth module, temperature detecting module；The temperature detecting module includes warm amplifying circuit, a/d converter；The temperature sensor passes sequentially through amplifying circuit, a/d converter and single-chip microcomputer and connected；By reducing the volume and weight of surface-mounted integrated circuit, accomplish small volume and less weight as far as possible, make it more suitable for can be portable, and the optimization on signal acquisition circuit ensures the accuracy and stability of its testing result as far as possible.
Description
Technical field
The present invention relates to field of temperature measurement, is a kind of portable high-precision electronic clinical thermometer specifically.
Background technology
Before electronic thermometer does not also have invention, mercury clinical thermometer is widely used in the measurement of bldy temperature of human body, Ren Menying
Expanded naturally with mercury heat, the principle of natural shrinking has made mercury clinical thermometer to the cold, general mercury clinical thermometer is by glass
It is made and includes mercury ball and mercury, end mercury ball is different with measurement position and has different shape and size, such as mouth temperature measurement
Be in slender type, anus temperature measurement with then justifying or be distinguished by with color to be short, in temperature taking process, the water of clinical thermometer
Silver is expanded by heating so that the mercury after expansion rises along mercury, and user can set according to the graduation apparatus amount of reading of outside
Data；But mercury clinical thermometer has frangible, measured value because of visual angle and the missing such as Different Results, especially mercury clinical thermometer includes
Mercury (mercury) metal, because mercury metal and its compound seriously endanger the mankind, environmental ecology and animals and plants, countries in the world disabling
Mercury turns into trend, therefore the promotion of electronic thermometer is already imperative.
Therefore a kind of high-precision electronic thermometer is provided, and reduces its volume and allow people have very much
It is necessary.
The content of the invention
It is an object of the invention to provide a kind of portable high-precision electronic clinical thermometer, not only largely simplifies it
Circuit structure and by it is outstanding processing its detection signal reach high-precision temperature check.
The present invention is achieved through the following technical solutions：A kind of portable high-precision electronic clinical thermometer, including shell, connection
Shell one end temperature sensor and be arranged on the control system of shell inner cavity；The control system includes single-chip microcomputer, divided
LCD display, power module, input keyboard not with single-chip microcomputer electric connection, bluetooth module, temperature detecting module；The temperature
Spending detection module includes warm amplifying circuit, a/d converter；The temperature sensor passes sequentially through amplifying circuit, a/d converter and list
Piece machine connects；
The amplifying circuit includes operational amplifier, resistance R1, resistance R3, resistance R4, resistance R5, variable resistor Rp, voltage stabilizing two
Pole pipe；The pin 6 of the operational amplifier separates a branch road connection resistance R1 before connecing 3V power supplys and 3V power supplys；The computing
The pin 1 of pin 6 of amplifier connects input and separates a branch road and is grounded by resistance R5；The pin 6 of the operational amplifier
Pin 5 branches out two branch roads after connecting variable resistor Rp and variable resistor Rp, and a branch road passes through resistance R3 and voltage stabilizing two
Pole pipe is grounded, and another branch road is grounded by resistance R4；The pin 8 of the operational amplifier connects output end.
When it is used：Power module be whole electronic thermometer power supply, for each different part provide corresponding to difference
Voltage ensures its steady operation, and temperature sensor is then responsible for collecting temperature information in the contact part of electronic thermometer, collection
The signal that temperature information most starts is very faint, to first pass through amplifying circuit and carry out signal amplification, can just make follow-up equipment
Receive.A/d converter is needed analog signal to be converted into the data signal that single-chip microcomputer can identify after signal amplifies.So
Single-chip microcomputer receives and handles this data signal afterwards.Temperature value is generated after single-chip microcomputer is handled and on the one hand passes through LCD display
It has been shown that, on the other hand by bluetooth module with being shown after mobile phone or other mobile device communications with display function
Show.Wherein input keyboard includes reset key and preserves key etc. function input button, and the temperature value currently measured can be entered
Row is saved in order to inquiry observation, also by the temperature check of reset key reset temperature meter progress next time.
In order to preferably realize the present invention, further, the a/d converter is LTC2484 chips.Here use
LTC2484ADC is because it employs EasyDrive input structures.This means the net difference in conversion divides sample rate current
It is close to zero.Therefore, the input sample electric current for flowing through resistive thermal resistor network does not cause any measurement error, this meaning
, without single operational amplifier buffer.Feed-through capacitor provides a low impedance path in high frequency.In many situations
Under, it is not necessary to continuous measurement temperature, but measurement per second once measures once for even per minute.In the unmeasured temperature of system
When, it is meaningful to save power consumption.And resistor network draws maximum 25 μ A electric currents from 2.5V benchmark.In order to avoid between measurement
Power attenuation, the work period of reference power supply is adjusted to only to turn on during measurement.The RC time constants of ADC inputs are about
For 5ms.Switched on power by 80ms before carrying out the measurements, it can be ensured that ADC inputs complete stability.
In order to preferably realize the present invention, further, the power module includes lithium battery and power-switching circuit, institute
Lithium battery is stated to be connected with single-chip microcomputer by power-switching circuit.The single-chip microcomputer is C8051F980 single-chip microcomputers.In order to meet low work(
The application demand of consumption, C8051F980 single-chip microcomputers provide five kinds of powder source management modes：Normally, shutdown, idle, sleep and on-hook.
The controller supports 1.8V to 3.6V supply voltage, has QFN20 small-sized encapsulated, is not only dropped in terms of power consumption
It is low, the theory of portable design is also complied with terms of volume and weight.
In order to preferably realize the present invention, further, the temperature sensor is MEB12-503F3950L87 NTC
Thermistor.The NTC thermistor of the encapsulated type has the characteristics of small volume, bent, is carried suitable for going out, not rapid wear
It is bad, and there is the characteristics of high-precision and high-stability using NTC thermistor.
The present invention compared with prior art, has advantages below and beneficial effect：
The present invention accomplishes small volume and less weight by reducing the volume and weight of surface-mounted integrated circuit as far as possible, makes it more suitable for can
It is portable, and the optimization on signal acquisition circuit ensures the accuracy and stability of its testing result as far as possible.
Brief description of the drawings
Fig. 1 is the theory diagram of the present invention.
Fig. 2 is the circuit theory diagrams of amplifying circuit of the present invention.
Embodiment
Embodiment 1：
A kind of portable high-precision electronic clinical thermometer of the present embodiment, as shown in Figure 1：Including shell, it is connected to shell one end
Temperature sensor and be arranged on the control system of shell inner cavity；The control system include single-chip microcomputer, respectively with single-chip microcomputer
The LCD display of electric connection, power module, input keyboard, bluetooth module, temperature detecting module；The temperature detecting module
Including warm amplifying circuit, a/d converter；The temperature sensor passes sequentially through amplifying circuit, a/d converter and single-chip microcomputer and connected；
As shown in Figure 2：The amplifying circuit includes operational amplifier, resistance R1, resistance R3, resistance R4, resistance R5, variable resistor
Rp, voltage-regulator diode；The pin 6 of the operational amplifier separates a branch road connection resistance before connecing 3V power supplys and 3V power supplys
R1；The pin 1 of pin 6 of the operational amplifier connects input and separates a branch road and is grounded by resistance R5；The computing is put
Two branch roads are branched out after the pin 5 of the pin 6 connection variable resistor Rp and variable resistor Rp of big device, a branch road passes through resistance
R3 and voltage-regulator diode ground connection, another branch road are grounded by resistance R4；The pin 8 of the operational amplifier connects output end.Its
In, effectively stable signal can not only be carried out to input signal by this amplifying circuit and amplified, make detection information more accurate,
And the variable resistor Rp of design can control the detection range of its temperature value by adjusting its resistance, make its electronic thermometer
Work is more flexible.
When it is used：Power module be whole electronic thermometer power supply, for each different part provide corresponding to difference
Voltage ensures its steady operation, and temperature sensor is then responsible for collecting temperature information in the contact part of electronic thermometer, collection
The signal that temperature information most starts is very faint, to first pass through amplifying circuit and carry out signal amplification, can just make follow-up equipment
Receive.A/d converter is needed analog signal to be converted into the data signal that single-chip microcomputer can identify after signal amplifies.So
Single-chip microcomputer receives and handles this data signal afterwards.Temperature value is generated after single-chip microcomputer is handled and on the one hand passes through LCD display
It has been shown that, on the other hand by bluetooth module with being shown after mobile phone or other mobile device communications with display function
Show.Wherein input keyboard includes reset key and preserves key etc. function input button, and the temperature value currently measured can be entered
Row is saved in order to inquiry observation, also by the temperature check of reset key reset temperature meter progress next time.
Embodiment 2：
The present embodiment does further optimization on the basis of embodiment 1, and the a/d converter is LTC2484 chips.Here use
LTC2484ADC is because it employs EasyDrive input structures.This means the net difference in conversion divides sample rate current
It is close to zero.Therefore, the input sample electric current for flowing through resistive thermal resistor network does not cause any measurement error, this meaning
, without single operational amplifier buffer.Feed-through capacitor provides a low impedance path in high frequency.In many situations
Under, it is not necessary to continuous measurement temperature, but measurement per second once measures once for even per minute.In the unmeasured temperature of system
When, it is meaningful to save power consumption.And resistor network draws maximum 25 μ A electric currents from 2.5V benchmark.In order to avoid between measurement
Power attenuation, the work period of reference power supply is adjusted to only to turn on during measurement.The RC time constants of ADC inputs are about
For 5ms.Switched on power by 80ms before carrying out the measurements, it can be ensured that ADC inputs complete stability.
The other parts of the present embodiment are same as Example 1, therefore repeat no more.
Embodiment 3：
The present embodiment does further optimization on the basis of embodiment 2, and the power module includes lithium battery and Power convert electricity
Road, the lithium battery are connected by power-switching circuit with single-chip microcomputer.The single-chip microcomputer is C8051F980 single-chip microcomputers.In order to full
The application demand of sufficient low-power consumption, C8051F980 single-chip microcomputers provide five kinds of powder source management modes：Normally, shut down, be idle, sleep with
And on-hook.The controller supports 1.8V to 3.6V supply voltage, has QFN20 small-sized encapsulated, not only in terms of power consumption
It is reduced, the theory of portable design is also complied with terms of volume and weight.
The temperature sensor is MEB12-503F3950L87 NTC thermistor.The NTC temperature-sensitives electricity of the encapsulated type
Resistance has the characteristics of small volume, bent, carries, is hardly damaged suitable for going out, and it is high-precision to use NTC thermistor to have
The characteristics of spending high stability.
The other parts of the present embodiment are same as Example 2, therefore repeat no more.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
Any simply modification, the equivalent variations made according to the technical spirit of the present invention to above example, each fall within the protection of the present invention
Within the scope of.
Claims (5)
- A kind of 1. portable high-precision electronic clinical thermometer, it is characterised in that：Including shell, be connected to shell one end temperature pass Sensor and the control system for being arranged on shell inner cavity；The control system includes single-chip microcomputer, is electrically connected with respectively with single-chip microcomputer LCD display, power module, input keyboard, bluetooth module, temperature detecting module；The temperature detecting module is put including temperature Big circuit, a/d converter；The temperature sensor passes sequentially through amplifying circuit, a/d converter and single-chip microcomputer and connected；The amplifying circuit includes operational amplifier, resistance R1, resistance R3, resistance R4, resistance R5, variable resistor Rp, voltage stabilizing two Pole pipe；The pin 6 of the operational amplifier separates a branch road connection resistance R1 before connecing 3V power supplys and 3V power supplys；The computing The pin 1 of pin 6 of amplifier connects input and separates a branch road and is grounded by resistance R5；The pin 6 of the operational amplifier Pin 5 branches out two branch roads after connecting variable resistor Rp and variable resistor Rp, and a branch road passes through resistance R3 and voltage stabilizing two Pole pipe is grounded, and another branch road is grounded by resistance R4；The pin 8 of the operational amplifier connects output end.
- A kind of 2. portable high-precision electronic clinical thermometer according to claim 1, it is characterised in that：The a/d converter For LTC2484 chips.
- A kind of 3. portable high-precision electronic clinical thermometer according to claim 1, it is characterised in that：The power module Including lithium battery and power-switching circuit, the lithium battery is connected by power-switching circuit with single-chip microcomputer.
- A kind of 4. portable high-precision electronic clinical thermometer according to claim 1, it is characterised in that：The single-chip microcomputer is C8051F980 single-chip microcomputers.
- A kind of 5. portable high-precision electronic clinical thermometer according to claim 1, it is characterised in that：The TEMP Device is MEB12-503F3950L87 NTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710937460.0A CN107647853A (en) | 2017-09-30 | 2017-09-30 | A kind of portable high-precision electronic clinical thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710937460.0A CN107647853A (en) | 2017-09-30 | 2017-09-30 | A kind of portable high-precision electronic clinical thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107647853A true CN107647853A (en) | 2018-02-02 |
Family
ID=61117066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710937460.0A Withdrawn CN107647853A (en) | 2017-09-30 | 2017-09-30 | A kind of portable high-precision electronic clinical thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107647853A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470383A (en) * | 2018-10-23 | 2019-03-15 | 张小敏 | A kind of pediatric clinical thermometer |
-
2017
- 2017-09-30 CN CN201710937460.0A patent/CN107647853A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470383A (en) * | 2018-10-23 | 2019-03-15 | 张小敏 | A kind of pediatric clinical thermometer |
| CN109470383B (en) * | 2018-10-23 | 2020-04-07 | 张小敏 | Thermometer for pediatrics |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Fisher et al. | A low-cost microcontroller-based system to monitor crop temperature and water status | |
| CN103034264B (en) | Attemperating unit | |
| CN101975804A (en) | Semiconductor gas sensor and temperature compensation method | |
| CN103913249A (en) | Temperature monitoring circuit device and method | |
| CN105277292A (en) | Temperature measurement device | |
| CN205246216U (en) | Portable intelligent temperature measuring device | |
| CN107647853A (en) | A kind of portable high-precision electronic clinical thermometer | |
| CN208002782U (en) | A kind of portable high-precision electronic clinical thermometer | |
| CN204346496U (en) | A kind of wireless wind speed wind-warm syndrome rheumatism self-recording device | |
| CN206102627U (en) | Children's bluetooth thermometer | |
| CN206102624U (en) | Bluetooth thermometer | |
| CN213423040U (en) | Plant liquid flow monitoring device | |
| CN202255672U (en) | Temperature measuring system | |
| CN104068834A (en) | Infrared digital body temperature measurement instrument | |
| CN204085558U (en) | A kind of environment tester | |
| CN104280698B (en) | Magnetic field measuring device | |
| CN102944323B (en) | A kind of micro-temperature sensor based on true Root Mean square Converter | |
| CN206523461U (en) | A kind of low power-consumption blood glucose meter | |
| CN206638985U (en) | Integrated environment data intelligence harvester | |
| CN204594614U (en) | Digital pressure measurement mechanism on a kind of SCM Based hydropress | |
| CN211013267U (en) | Intelligent electronic thermometer based on Bluetooth technology | |
| CN205988281U (en) | A kind of temperature detection device based on Radio Transmission Technology and system | |
| CN206102625U (en) | Blue tooth body temperature meter | |
| CN103852624A (en) | Hand-held convertor transformer core grounding current tester | |
| CN215296508U (en) | Wireless charging Bluetooth wifi thermometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180202 |
|
| WW01 | Invention patent application withdrawn after publication |