CN104545827B - Body temperature detection circuit and thermometer comprising body temperature detection circuit - Google Patents
Body temperature detection circuit and thermometer comprising body temperature detection circuit Download PDFInfo
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- CN104545827B CN104545827B CN201410809664.2A CN201410809664A CN104545827B CN 104545827 B CN104545827 B CN 104545827B CN 201410809664 A CN201410809664 A CN 201410809664A CN 104545827 B CN104545827 B CN 104545827B
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- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6814—Head
- A61B5/6815—Ear
- A61B5/6817—Ear canal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6814—Head
- A61B5/682—Mouth, e.g., oral cavity; tongue; Lips; Teeth
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a body temperature detection circuit and a thermometer comprising the body temperature detection circuit. The body temperature detection circuit comprises a power supply V1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, an operational amplifier IC1, an electromagnetic relay R5, a single-chip microcomputer, a digital display module U1 and a digital display module power supply V2, wherein a first temperature sensor is a thermistor Rt1; a second temperature sensor is a thermistor Rt2; the resistor R1 the thermistor Rt1 which are connected in series, the resistor R2 and the thermistor Rt2 which are connected in series, and the resistor R3 and the resistor R4 which are connected in series are connected to the two ends of the power supply V1 after being connected in parallel together. The body temperature detection circuit and the thermistor provided with the body temperature detection circuit can be used for identifying the thermal balance degree of the thermistor and a human body, so that the human body temperature can be measured accurately the first time.
Description
Technical field
The present invention relates to a kind of temperature check circuit and the clinical thermometer comprising the temperature check circuit, belong to medical apparatus and instruments skill
The technical field of art.
Background technology
Body temperature is all the time the important indication of medical diagnosiss, therefore in medical instruments field, has substantial amounts of body temperature to survey
Amount device product.Traditional mercurial thermometer performance is more reliable, but required time of measuring is very long, patient generally need into
The row measurement of more than five minutes can just measure in vivo accurately body temperature numerical value, and temperature needs the thermometer body through glass
Amplification just can accurately read, and ease for use is not good.Recently pandemic electronic thermometer, is generally constituted using critesistor
Bridge circuit to being heated by critesistor after the change of resistance bring the electric potential difference that bridge balance changes measuring patient indirectly
Body temperature.Its convenient degree and ease for use have been greatly improved relative to traditional mercurial thermometer.However, electronic thermometer
Thermal balance is set up from into human body thermometric position to thermometric position, it is still desirable to one section of longer time.Existing electronics temperature
Degree is counted in order to avoid just having read inaccurate result when electronic thermometer is not yet identical with body temperature temperature, generally in addition
Be independently arranged a timer again, carry out after some seconds after temperature data starts to increase buzzing remind patient temperature meter with
Human body sufficient heat exchange, current body temperature value has been accurate body temperature value.However, this kind of electronic thermometer is using fixed survey
It is the warm time, it is impossible to which the very first time for measuring accurate body temperature value in thermometer suggests that patient reads body temperature, still not easy to be fast enough
It is prompt.Also, when clinical thermometer does not measure accurate body temperature, clinical thermometer can similarly show registration, it is possible to cause body temperature number
According to mistake survey.
Although existing infra-red thermometer is more convenient, also quickly, infra-red thermometer is present to be received measuring speed
It is big to ambient temperature effect, the infrared ray interference in extraneous other sources is easily subject to, bring the inaccurate problem of temperature-measuring results.
The content of the invention
Goal of the invention：It is an object of the invention to provide a kind of more accurate temperature check circuit of thermometric and clinical thermometer,
The technical problem further to be solved of the invention is that the mistake for avoiding temperature data is surveyed.
Technical scheme：Temperature check circuit of the present invention, including power supply V1, resistance R1, resistance R2, resistance R3, electricity
Resistance R4, operational amplifier IC1, electromagnetic relay R5, single-chip microcomputer (6), digital display module U1 and digital display modular power source V2, described first
Temperature sensor is critesistor Rt1, the second temperature sensor is critesistor Rt2, the resistance R1 of the series connection and heat
Quick resistance Rt1, the resistance R2 of series connection and critesistor Rt2, the resistance R3 of series connection and resistance R4 are together connected to after parallel connection described
The two ends of power supply V1, the input of two inputs of operational amplifier IC1 one is connected to the resistance R1 and critesistor Rt1 of series connection
Between, another input be connected between the resistance R3 of series connection and resistance R4, in two control ends of the electromagnetic relay R5
One control end is connected between the resistance R1 of series connection and critesistor Rt1, another control end is connected to the resistance R2 of series connection
And critesistor Rt2 between, the supply port and digital display mould of controlled terminal connection digital display module U1 of the electromagnetic relay R5
Block power supply V2, to control the switch of digital display module U1, the single-chip microcomputer receives the signal that operational amplifier IC1 sends, the list
Digital display module U1 is sent to after the digital display signal of the signal corresponding temperature value that piece machine sends operational amplifier IC1.
Further, the thermal resistance between critesistor Rt1 and tested body temperature is less than at critesistor Rt2 and tested body temperature
Between thermal resistance.
Present invention additionally comprises another kind of temperature check circuit, including power supply, resistance R1, resistance R2, resistance R3, resistance R4,
Operational amplifier IC1 and light emitting diode D1, first temperature sensor is critesistor Rt1, second temperature sensing
Device is critesistor Rt2, the resistance R1 and critesistor Rt1 of the series connection, the resistance R2 of series connection and critesistor Rt2, series connection
Resistance R3 and resistance R4 be together connected to the two ends of the power supply after parallel connection, the inputs one of the operational amplifier IC1 two are defeated
Enter that end is connected between the resistance R1 of series connection and critesistor Rt1, another input is connected to the resistance R3 and resistance R4 of series connection
Between, one end of the light emitting diode D1 is connected between the resistance R1 of series connection and critesistor Rt1, the other end is connected to string
Between the resistance R2 and critesistor Rt2 of connection.
Further, also including single-chip microcomputer and digital display module U1, the single-chip microcomputer receives the letter that operational amplifier IC1 sends
Number, it is sent to the digital display mould after the digital display signal of the signal corresponding temperature value that the single-chip microcomputer sends operational amplifier IC1
Block U1.
Further, the critesistor Rt1 is less than critesistor Rt2 and measured body with the thermal resistance between tested body temperature
Thermal resistance between temperature.
Present invention additionally comprises including the clinical thermometer of any of the above-described temperature check circuit.
Compared with prior art, its advantage is the present invention：Body temperature detector slowdown monitoring circuit and it is provided with the temperature check circuit
Thermometer can recognize the thermal balance degree of thermometer and human body, so as to accurately measure body temperature in the very first time.
Description of the drawings
Fig. 1 is the circuit diagram of the embodiment of the present invention 1；
Fig. 2 is the circuit diagram of the embodiment of the present invention 2；
Fig. 3 is critesistor Rt1 of the present invention and critesistor Rt2 set location schematic diagrams.
Specific embodiment
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the enforcement
Example.
Embodiment 1：
Fig. 1 is the present embodiment temperature check circuit schematic diagram, as illustrated, critesistor Rt1 and resistance R1 goes here and there
Connection, critesistor Rt2 connects with resistance R2, and resistance R3 connects with R4, is connected to power supply V1 after three series arm parallel connections, then
By the use of operational amplifier IC1, used as amplifier, (accessory circuit and power supply circuits are not shown in figure 3 around IC1, using commonly putting
Big circuit is arranged.), two inputs connect respectively the node between R3 and R4, the node between R1 and Rt1, by so
The bridge circuit of composition measures the temperature at critesistor Rt1 indirectly by the voltage difference of the input of amplifier two.R1、R2、
The resistance of R3, R4 is 1000 ohm, and critesistor Rt1 and Rt2 is the critesistor of same model, and its resistance is also at room temperature
1000 ohm.Likewise, series connection R2 with an electric bridge electricity is equally constituted between Rt2, the R1 for connecting and Rt1 and diode D1
Road, by the electric potential difference of electric bridge electromagnetic relay R5, when the voltage of electromagnetic relay R5 control ends is zero, electromagnetism relay are controlled
Device R5 controlled terminals are closed, and digital display module power supply V2 is connected to digital display module U1 for digital display by electromagnetic relay R5 controlled terminals
Module for power supply.When whether the temperature at Rt1 and Rt2 is identical, representative now read accurate body temperature value, digital display mould
Block just restores electricity display numerical value, to avoid being misread in inaccurate numerical value.The analog input end of single-chip microcomputer 6 is constituted with IC1
Amplifier out is connected with each other, and enters rower by being positioned over the magnitude of voltage of amplifier output under different temperatures to the system
It is fixed, several tables of temperature at output valve obtained by calibrating and critesistor are stored in single-chip microcomputer 6, obtained in real time by look-up table
The corresponding temperature value of output valve, and be converted to digital display signal and be sent at digital display module U1.
There is the order of a priority with human body thermal balance to cause critesistor Rt1 and critesistor Rt2, temperature-sensitive electricity is set
Thermal resistance between resistance Rt1 and tested body temperature is less than the thermal resistance between critesistor Rt2 and tested body temperature.Concrete method to set up
May be referred to shown in Fig. 3, the thermometer structure includes temperature check circuit 1, housing 2, the first temperature sensor 3, second temperature
Sensor 4 and thermometric contact site 5, wherein, the first temperature sensor 3 is critesistor Rt1, and second temperature sensor is
Critesistor Rt2. is provided with thermometric contact site 5 protruding upward on the upper surface of housing 2, the thermometric contact, and 5 by flexibility
Polyurethane foam is made, and the lower surface heart wherein that is connected with housing is provided with a passage, for being arranged on the top of thermometric contact site 5
The first temperature sensor 3 wire is introduced on the detection circuit 1 in housing, be additionally provided with the in the base portion of thermometric contact site 5
Two temperature sensors 4, the lead of second temperature sensor 4 again passes through housing and introduces on detection circuit 1.It is arranged such, when making
Used time, the thermometric contact site 5 and measured's thermometric position, such as skin surface, auditory meatus or oral cavity, anus are contacted with each other, because
It is more deep for the first temperature sensor 3, therefore faster thermal balance will be produced with measured, body temperature numerical value is reached, and second is warm
Degree sensor similarly with measured's heat balance, can reach the body temperature temperature of measured.Therefore, 3 liters of the first temperature sensor
Temperature faster, then heats to body temperature, second temperature sensor 4 heat up it is relatively slow, but be also warming up to body temperature.First temperature is passed
The temperature difference of sensor and second temperature sensor then from large to small, until temperature difference is down to almost nil, now can be determined that, the
One temperature sensor 3 and second temperature sensor 4 with measured's body temperature have reached thermal balance, have measured accurate body temperature,
And the temperature value that now the first temperature sensor is measured is accurate body temperature value.
Embodiment 2：
Fig. 2 is the circuit diagram of the detection circuit 1 and 89C205 type single-chip microcomputers, as illustrated, first sensor 3 is
Critesistor Rt2 is for critesistor Rt1, second temperature sensor 4, critesistor Rt1 connects with resistance R1, critesistor
Rt2 connects with resistance R2, and resistance R3 connects with R4, and after three series arm parallel connections power supply V1 is connected to, and is then put using computing
(accessory circuit and power supply circuits are not shown in figure 3 around IC1, are arranged using common amplifying circuit used as amplifier for big device IC1
.), two inputs connect respectively the node between R3 and R4, the node between R1 and Rt1, by such electric bridge for constituting
Circuit measures the temperature at critesistor Rt1 indirectly by the voltage difference of the input of amplifier two.The resistance of R1, R2, R3, R4
1000 ohm are, critesistor Rt1 and Rt2 is the critesistor of same model, its resistance is also at room temperature 1000 ohm.Together
Sample, the R2 and Rt2 of series connection, the R1 for connecting and a bridge circuit is equally constituted between Rt1 and diode D1, by diode
Whether the resistance for flickering to show Rt1 and Rt2 of D1 is identical, that is, whether the temperature at Rt1 and Rt2 is identical.Work as diode
During extinguishing, that is, represent and now read accurate body temperature value.The amplification that the analog input end of single-chip microcomputer 6 is constituted with IC1
Device outfan is connected with each other, and is demarcated by being positioned over the magnitude of voltage of amplifier output under different temperatures to the system, will
Several tables of temperature are stored in single-chip microcomputer 6 at output valve obtained by calibrating and critesistor, are exported in real time by look-up table
Value thinks corresponding temperature value, and is converted to digital display signal and is sent at digital display module U1.The setting side of critesistor Rt1 and Rt2
Formula is with embodiment 1.
As described above, although the present invention has been represented and described with reference to specific preferred embodiment, it must not be explained
It is to the restriction of itself of the invention.Under the premise of the spirit and scope of the present invention defined without departing from claims, can be right
In the form and details various changes can be made for it.
Claims (3)
1. a kind of temperature check circuit, it is characterised in that including power supply V1, resistance R1, resistance R2, resistance R3, resistance R4, computing
Amplifier IC1, electromagnetic relay R5, single-chip microcomputer（6）, the first temperature sensor, second temperature sensor, digital display module U1 and
Digital display module power supply V2, first temperature sensor is critesistor Rt1, the second temperature sensor is critesistor
Rt2, the resistance R1 and critesistor Rt1 of series connection, the resistance R2 and critesistor Rt2 of series connection, the resistance R3 and resistance R4 of series connection
The two ends of the power supply V1 are together connected to after parallel connection, the input of two inputs of operational amplifier IC1 one is connected to series connection
Resistance R1 and critesistor Rt1 between, another input be connected between the resistance R3 of series connection and resistance R4, the electromagnetism after
A control end in two control ends of electrical equipment R5 is connected between the resistance R1 of series connection and critesistor Rt1, another control
End is connected between the resistance R2 of series connection and critesistor Rt2, and the two ends of the controlled terminal of the electromagnetic relay R5 connect respectively
The supply port and digital display module power supply V2 of digital display module U1 are connected to, to control the switch of digital display module U1, the single-chip microcomputer connects
Receive the signal that operational amplifier IC1 sends, the digital display of the signal corresponding temperature value that the single-chip microcomputer sends operational amplifier IC1
Digital display module U1 is sent to after signal.
2. temperature check circuit according to claim 1, it is characterised in that at the critesistor Rt1 and tested body temperature
Between thermal resistance less than the thermal resistance between critesistor Rt2 and tested body temperature.
3. a kind of clinical thermometer, including the temperature check circuit described in claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410809664.2A CN104545827B (en) | 2014-12-23 | 2014-12-23 | Body temperature detection circuit and thermometer comprising body temperature detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410809664.2A CN104545827B (en) | 2014-12-23 | 2014-12-23 | Body temperature detection circuit and thermometer comprising body temperature detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104545827A CN104545827A (en) | 2015-04-29 |
| CN104545827B true CN104545827B (en) | 2017-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410809664.2A Active CN104545827B (en) | 2014-12-23 | 2014-12-23 | Body temperature detection circuit and thermometer comprising body temperature detection circuit |
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| JP2022156713A (en) * | 2021-03-31 | 2022-10-14 | フォスター電機株式会社 | Head set |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4658855A (en) * | 1980-10-03 | 1987-04-21 | Silicon Valley Group | Mass flow controller |
| CN2147519Y (en) * | 1993-03-31 | 1993-11-24 | 国营二六二厂 | Electronic temp. difference tester |
| JPH11237356A (en) * | 1998-02-19 | 1999-08-31 | Mitsui Mining & Smelting Co Ltd | Method and device for identifying fluid |
| CN101738522B (en) * | 2008-11-20 | 2011-10-26 | 漳州国绿太阳能科技有限公司 | Control circuit for detecting alternating current and direct current by temperature comparison method |
| CN202060761U (en) * | 2010-10-18 | 2011-12-07 | 蒋英明 | Double-sensor electronic thermometer |
| CN204654899U (en) * | 2014-12-23 | 2015-09-23 | 金陵科技学院 | Measurement of bldy temperature circuit and the clinical thermometer comprising this measurement of bldy temperature circuit |
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Effective date of registration: 20190202 Address after: Room 601, No. 18, Ningshuang Road, Yuhuatai District, Nanjing City, Jiangsu Province, 210000 Patentee after: Nanjing Daoshenghong Network Technology Co., Ltd. Address before: 210000 No. 99, hung Jing Avenue, Jiangning District, Nanjing, Jiangsu. Patentee before: Jinling Institute of Technology |
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