CN113390518B - Ear thermometer with high measurement accuracy and measurement method thereof - Google Patents
Ear thermometer with high measurement accuracy and measurement method thereof Download PDFInfo
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- CN113390518B CN113390518B CN202110625840.7A CN202110625840A CN113390518B CN 113390518 B CN113390518 B CN 113390518B CN 202110625840 A CN202110625840 A CN 202110625840A CN 113390518 B CN113390518 B CN 113390518B
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- 238000000034 method Methods 0.000 claims description 14
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- 238000009529 body temperature measurement Methods 0.000 abstract description 4
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 210000001061 forehead Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0003—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter
- G01J5/0011—Ear thermometers
Abstract
The invention discloses an ear thermometer with high measurement accuracy and a measurement method thereof, wherein the ear thermometer comprises an ear thermometer and a charging seat, the ear thermometer comprises a mainboard, a detection NTC circuit is arranged on the mainboard, and the detection NTC circuit is configured to be used for detecting the temperature of a reference blackbody surface; the charging base is internally provided with a black body, a thermistor is arranged below the black body, and the thermistor is connected with a thermistor connection reed and is configured to be used for communicating with a detection NTC circuit. The ear thermometer can be combined with an application scene of the ear thermometer, the temperature measurement offset temperature of the ear thermometer is compensated by adopting the black body reference temperature, the temperature detection accuracy is high, and the detection rate of the measured temperature is high.
Description
Technical Field
The invention particularly relates to an ear thermometer with high measurement accuracy and a measurement method thereof.
Background
The body temperature detection is often needed in public places such as stations, airports, hospitals, ports, schools and the like, and the detection of the body temperature is more important when people who generate heat are found out, particularly when epidemic situations occur.
The ear thermometer is a non-contact telemetering type temperature measuring instrument, and uses the infrared spectrum emitted by the tympanic membrane (equivalent to the hypothalamus) to determine the body temperature.
In the prior art, the ear thermometer has various types and models, but the condition that the temperature measurement is inaccurate in practical application generally exists in the ear thermometer. When the environment temperature, the distance and the like are changed, the detected temperature has deviation.
Disclosure of Invention
In view of the above situation, the present invention provides an ear thermometer with high measurement accuracy and a measurement method thereof to overcome the defects of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
an ear thermometer with high measurement accuracy comprises an ear thermometer and a charging seat, wherein the ear thermometer comprises a mainboard, a detection NTC circuit is arranged on the mainboard, and the detection NTC circuit is configured to be used for detecting the temperature of a reference blackbody surface; the charging seat is internally provided with a black body, a thermistor is arranged below the black body, and the thermistor is connected with a thermistor wiring reed and is configured to be capable of being used for being communicated with and detecting an NTC circuit.
Furthermore, the front end of the ear thermometer is provided with a metal connecting sheet which is configured to be in contact connection with a thermistor connecting reed, so as to communicate with an NTC detection circuit for detecting the interior of the ear thermometer.
Furthermore, a charging reed is arranged in the charging seat.
Furthermore, the charging seat is internally provided with an ear thermometer positioning structure.
Further, the ear thermometer positioning structure includes an ear cup positioning slot configured to receive an ear cup.
Furthermore, the thermistor is positioned at the bottom of the earcap positioning groove.
Furthermore, a calculation module is arranged on the main board and is configured to be capable of calculating the real temperature value of the measured object.
Furthermore, the ear thermometer also comprises an ear temperature detecting head, and the ear temperature detecting head comprises a probe structure and a thermopile sensor.
A measuring method of an ear thermometer with high measuring accuracy is provided, the ear thermometer is the above ear thermometer, and the method comprises the following steps:
(1) inserting the probe into the earmuff and waiting for earmuff signals;
(2) after the ear muff signal appears, inserting the ear thermometer into the ear thermometer positioning structure, communicating the NTC detection circuit and waiting for the black body temperature signal;
(3) the temperature measuring state lamp is on;
(4) inserting the probe into the auditory canal;
(5) pressing a detection key, and reading data after 2-3 s;
(6) calculating, storing and displaying the result temperature;
(7) and withdrawing the earcap mark.
Further, in the step (6), the calculation module performs calculation to obtain the result temperature, and the calculation of the result temperature T' comprises
b＝T 1 -T (1)
T 0 ＝t 0 +273.15 (3)
Wherein T represents the reference black body surface temperature, T 1 Indicating the temperature of the black body surface measured by the thermopile sensor;
t' represents the resulting temperature of the final display, T 0 Is ambient temperature; k is the thermopile photo-electric conversion coefficient;
v is the output electric signal of the thermopile sensor, and V takes the volt as the unit; b is the fixed intercept.
The invention has the beneficial effects that:
the ear thermometer can be combined with an application scene of the ear thermometer, the temperature measurement offset temperature of the ear thermometer is compensated by adopting the black body reference temperature, the temperature detection accuracy is high, and the detection rate of the measured temperature is high.
Drawings
Fig. 1 is a sectional view of the charging stand (showing the internal structure of the charging stand).
FIG. 2 is a schematic representation of the measurement method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application.
Reference in the specification 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 specification. 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. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
The utility model provides an ear temperature appearance that measurement accuracy is high, includes ear temperature rifle and charging seat, and ear temperature rifle can combine with the charging seat, and the charging seat is configured to can charge for ear temperature rifle. In some preferred modes, the ear thermometer comprises a mainboard, wherein the mainboard is provided with a detection NTC circuit which is configured to be capable of detecting and obtaining the reference blackbody surface temperature. As shown in fig. 1, a black body is arranged inside the charging base, a thermistor is arranged below the black body, the thermistor is connected with a thermistor connection reed, and the thermistor connection reed is configured to be used for connecting with a detection NTC circuit.
In some preferred forms, as shown in fig. 1, the thermistor terminal strip includes two terminals, one of which is connected to the negative electrode and the other of which is connected to the negative electrode. In some preferred modes, the thermistor connecting reed is an elastic connecting reed, so that the connecting reed is tightly combined with other parts, good contact can be formed, and disconnection of the connection can be avoided.
In some preferred modes, the side face of the front end of the ear thermometer is provided with a metal connecting sheet which is configured to be in contact connection with a thermistor connecting reed, so that the metal connecting sheet is communicated with an internal detection NTC circuit of the ear thermometer, and the standard temperature of the reference black body surface can be measured. In some preferred modes, during specific implementation, two metal connecting sheets are arranged on the side face of the front end of the ear thermometer, one of the metal connecting sheets can be connected with the positive electrode, the other metal connecting sheet can be connected with the negative electrode, one ends of the two metal connecting sheets are respectively connected with the two thermistor connecting reeds, the other ends of the two metal connecting sheets are respectively connected with the detection NTC circuit, so that a detection loop is formed, the whole detection NTC circuit is communicated, and the temperature of the reference black body face can be detected.
In some preferred modes, the metal connecting sheet is a copper sheet.
In some preferred modes, as shown in fig. 1, a charging metal reed is arranged at one end inside the charging seat, and can be in contact connection with the charging metal reed on the shell of the ear thermometer, so as to charge the ear thermometer.
In some preferred modes, as shown in fig. 1, an earcap chamber is arranged inside the charging seat, and the earcap chamber is located at the middle position of the charging seat. In some preferred modes, the supporting piece is arranged below the earcap bin, and the earcap bin is arranged in an inclined structure, so that the earcap can be conveniently taken from the earcap bin.
In some preferred modes, as shown in fig. 1, an ear thermometer positioning structure is disposed inside the charging seat, and is configured to enable the ear thermometer to be fixed inside the charging seat, that is, the ear thermometer has a fixed position inside the charging seat, so as to prevent the ear thermometer from shaking, shifting, and the like inside the charging seat.
In some preferred modes, the positioning structure of the ear thermometer comprises an earmuff positioning groove which is configured to be used for placing an earmuff, and a probe of the ear thermometer can be combined with the earmuff so as to realize the positioning of the ear thermometer. In some preferred modes, the earmuff constant head tank can be the form of draw-in groove, and the earmuff can be placed inside the draw-in groove, and the probe of ear thermometer can be put into the earmuff, and then can make ear thermometer be in the charging seat inside, fixed ear thermometer avoids ear thermometer to rock in the charging seat, the aversion.
In some preferred modes, the thermistor is positioned at the bottom of the earcap positioning groove. The upper part of the thermistor is in contact connection with a standard black body sheet, and the thermistor is connected with a thermistor wiring reed.
In some preferred modes, the black body sheet is made of a hot-melt small metal, only absorbs light and does not reflect, and in some preferred modes, the thickness of the black body sheet is millimeter. The thinner the black body sheet is, the closer the NTC high-precision thermistor temperature value is to the black body sheet. Conversely, if the blackbody is thick, the temperature difference exists between the upper surface and the lower surface of the blackbody, and the temperature measured by the NTC detection circuit (i.e., the temperature of the lower surface of the blackbody) cannot represent the temperature of the upper surface of the blackbody.
In some preferred modes, the ear thermometer further comprises an ear temperature detecting head, the ear temperature detecting head comprises a probe structure and a thermopile sensor, and the thermopile sensor is connected with the main board.
In some preferred manners, a computing module is disposed on the main board, and is configured to calculate an actual temperature value (i.e., a calibrated temperature value) of the measured object.
In some preferred modes, a path of detecting NTC circuit is arranged on the mainboard. NTC is a negative temperature coefficient thermistor, i.e. the resistance becomes smaller (exponentially) with increasing temperature. The detection NTC circuit is configured to provide an accurate reference black body surface temperature as a real-time calibration standard value T, and transmit the standard value T to a calculation module of the mainboard.
In some preferred modes, the temperature T of the blackbody surface measured by the thermopile sensor 1 The difference b between the two values can be calculated by the calculation module; b is calculated as follows:
b＝T 1 -T (1)
when the ear thermometer measures the temperature of the target object, the temperature of the target object measured by the thermopile sensor is T 2 Then, the actual temperature of the object is: t ═ T 2 -b，
T 0 ＝t 0 +273.15 (3)
The following equations (1) to (2) can be obtained:
from equations (3) to (4), the resulting temperature T' finally displayed can be obtained.
Wherein, t 0 Is ambient temperature; k is the thermopile photo-electric conversion coefficient; v is the output electric signal of the thermopile sensor, and the V takes the voltage as the unit; and B is a fixed intercept, and is related to the difference between the space temperature of the thermopile and the ambient temperature outside the measured object when the thermopile is stable.
The principle of the temperature measurement of the invention is as follows:
according to the blackbody radiation principle-Planck's law, the radiation wavelength of the human body temperature center is near 9.36um, and the wavelength covers the wave band of 5-14 nm. According to this principle, the higher the body temperature, the stronger the radiation in this band.
Common methods calculate and calibrate the temperature using the following formula:
v is in volt as single, T 0 ＝t 0 +273.15，t 0 Ambient temperature:
the ear thermometer or forehead thermometer requires stable temperature, and the value B can be applied.
However, in practical application, the difference between the reference temperature measured by the NTC and the temperature at the cold end of the thermopile is caused by the fluctuation of the ambient temperature (such as room temperature difference, air conditioning operation, etc.), and the formula (1) is not applicable.
However, any measuring instrument generally does not generate too large fluctuation in a short time such as 60S in a changing room temperature environment, and according to the modulation idea, the shorter the time interval is, the difference between the system signal and the background signal can increase the detection limit and the detection rate of the measured quantity.
In the invention, when the ear cap is sleeved, the front end of the ear thermometer is provided with the metal connecting sheet which can be in contact connection with the thermistor connecting reed, the metal connecting sheet is communicated with the internal detection NTC detection circuit of the ear thermometer, the reference black body surface temperature T is measured, and the black body surface detection temperature T is measured 1 The difference value with T is substituted into the formula (4) as b for calculation, and the temperature value of the target object is corrected.
A method for measuring an ear thermometer with high measurement accuracy, as shown in fig. 2, includes the following steps:
(1) starting up, inserting the probe into the earcap, waiting for earcap signals,
(2) the earmuff signal appears, show that earmuff and probe combine (promptly the probe has inserted the earmuff), then insert ear thermometer into ear thermometer location structure, the earmuff is located the earmuff constant head tank, and at this moment, the metal connecting piece of ear thermometer front end side is connected with the thermistor wiring reed contact of earmuff side, and intercommunication NTC detection circuitry can record the temperature T of reference blackbody face, and simultaneously, the thermopile sensor can record blackbody face temperature T 1 ；
(3) The temperature measuring state lamp is on (the temperature of the black body surface is measured), and the probe is inserted into the auditory canal;
(4) pressing a detection key, and reading thermopile/reference temperature data/ear canal depth data and the like after 2-3 s;
(5) calculating/storing/displaying the resulting temperature;
(6) and withdrawing the earcap mark.
In the step (5), a calculation module of the ear thermometer calculates to obtain a result temperature, and the calculation of the result temperature T' comprises
b＝T 1 -T (1)
T 0 ＝t 0 +273.15 (3)
Wherein T represents the reference black body surface temperature, T 1 Indicating thermopile sensor measurementsObtaining the temperature of the black surface;
t' represents the resulting temperature of the final display, T 0 Is ambient temperature; k is the thermopile photo-electric conversion coefficient;
v is the output electric signal of the thermopile sensor, and V takes the volt as the unit; b is the fixed intercept.
Other components or other embodiments in this embodiment may be implemented by conventional components or methods in the art.
Example 2
In this embodiment, ear thermometer includes shell, mainboard, ear temperature detecting head and earmuff, and the mainboard is connected with ear temperature detecting head, and the mainboard is located inside the shell, and ear temperature detecting head partly is located inside the shell, and another part is located the shell outside for detect the temperature.
In some preferred modes, a battery groove is arranged inside the shell and used for placing a battery. In some preferred modes, a charging metal reed is arranged outside the shell and connected with a battery, and the battery is also connected with the mainboard.
In some preferred forms, the ear temperature probe comprises a probe structure, a thermopile sensor assembly, an adapter plate and an ear muff module; in some preferred forms, the probe structure includes a 3-way ear canal contact coating, a thermopile mounting structure, and an adapter plate mounting structure.
In some preferred forms, the thermopile sensor assembly includes a thermopile sensor, a flexible connection circuit; in some preferred modes, the thermopile sensor is a self-constant temperature thermopile sensor, the thermopile sensor is connected with a flexible connecting circuit, the flexible connecting circuit is connected with an adapter plate, and the adapter plate is connected with the main board.
In some preferred modes, the thermopile sensor is installed at the most front end of the ear temperature probe structure and is close to the surface to be measured.
In some preferred forms, the ear muff module comprises: basic structure body, earmuff gauge stick and spring and earmuff. The basic structure body is connected with the earcap detection rod, and the earcap detection rod is directly or indirectly connected with the spring. In some preferred forms, the ear temperature probe structure and the structure of the earmuff module are fastened by a snap. In some preferred forms, the earmuff is constructed from a material having a thermal radiation transmission rate of > 80%.
When the ear cap is sleeved in the ear temperature detecting head, the spring is compressed, the ear cap detecting rod contacts the contact switch of the adapter plate, and the mainboard receives an ear cap sleeving signal; the screen on the mainboard is reminded by the matched identification of the earmuff.
The ear temperature detecting head with the ear cap is deeply inserted into the auditory canal, when the contact coating of 3 auditory canals is contacted with the auditory canal, the detection circuit detects the action signal, judges the depth of the auditory canal and is used for detecting and correcting the temperature;
when the two signals are both established, normal ear temperature detection is carried out by pressing a detection key, and meanwhile, acousto-optic prompt is given.
In some preferred manners, a calculation module is disposed on the main board, and is configured to calculate an actual temperature value (i.e., a calibrated temperature value) of the measured object.
Other embodiments in this example are the same as example 1.
It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.
The above-mentioned embodiments only express several embodiments of the present application, 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 concept of the present application, which falls within the scope of protection of the present application.
Claims (8)
1. A measuring method of an ear thermometer with high measuring accuracy is characterized in that,
the method comprises the following steps:
(1) inserting the probe into the earmuff and waiting for earmuff signals;
(2) after a signal for displaying the combination of the ear cap and the probe appears, the ear thermometer is inserted into the ear thermometer positioning structure, communicated with the NTC detection circuit and waits for a black body temperature signal;
(3) the temperature measuring state lamp is on;
(4) inserting the probe into the auditory canal;
(5) pressing a detection key, and reading data after 2-3 s;
(6) calculating, storing and displaying the result temperature;
the calculation module calculates to obtain a result temperature, and the calculation of the result temperature T' comprises
b＝T 1 -T (1)
T 0 ＝t 0 +273.15 (3)
Wherein T represents the temperature of the reference black body surface, and T1 represents the temperature of the black body surface measured by the thermopile sensor;
t' represents the resulting temperature finally displayed, T0 is the ambient temperature; k is the thermopile photo-electric conversion coefficient;
v is the output electric signal of the thermopile sensor, and V takes the volt as the unit; b is a fixed intercept;
(7) withdrawing the earcap mark;
the ear thermometer comprises a mainboard, wherein a detection NTC circuit is arranged on the mainboard and is configured to be used for detecting the temperature of a reference blackbody surface; the charging seat is internally provided with a black body, a thermistor is arranged below the black body, and the thermistor is connected with a thermistor wiring reed and is configured to be capable of being used for being communicated with and detecting an NTC circuit.
2. The method as claimed in claim 1, wherein the ear thermometer has a high measurement accuracy,
the front end of the ear thermometer is provided with a metal connecting sheet which is configured to be in contact connection with a thermistor wiring reed, so that an internal detection NTC detection circuit of the ear thermometer is communicated.
3. The method according to claim 1, wherein the ear thermometer is a thermometer with high measurement accuracy,
the charging seat is internally provided with a charging reed.
4. The method according to claim 1, wherein the ear thermometer is a thermometer with high measurement accuracy,
the charging seat is also internally provided with an ear thermometer positioning structure.
5. The method according to claim 1, wherein the ear thermometer is a thermometer with high measurement accuracy,
the ear thermometer positioning structure includes an ear cup positioning slot configured to receive an ear cup.
6. The method as claimed in claim 1, wherein the ear thermometer has a high measurement accuracy,
the thermistor is positioned at the bottom of the ear cap positioning groove.
7. The method according to claim 1, wherein the ear thermometer is a thermometer with high measurement accuracy,
the mainboard is provided with a calculation module which is configured to calculate the real temperature value of the measured object.
8. The method according to claim 1, wherein the ear thermometer is a thermometer with high measurement accuracy,
the ear thermometer also comprises an ear temperature detecting head, and the ear temperature detecting head comprises a probe structure and a thermopile sensor.
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| CN210135998U (en) * | 2019-07-09 | 2020-03-10 | 东莞市医脉实业有限公司 | Elasticity strenghthened type ear thermometer earmuff |
| CN212621110U (en) * | 2020-07-22 | 2021-02-26 | 杭州凯彻电子有限公司 | Ear thermometer for children |
| CN112697281A (en) * | 2020-12-04 | 2021-04-23 | 可孚医疗科技股份有限公司 | Temperature measurement circuit for ear thermometer, control method and ear thermometer |
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