KR20110082282A - Apparatus and method for detecting core temperature in infrared rays thermometer - Google Patents

Abstract

PURPOSE: A device and method for detecting core temperature in the infrared rays thermometer is provided to improve the performance of the infrared rays thermometer by detecting the core temperature instead of the surface temperature of the man forehead. CONSTITUTION: The infrared rays thermometer comprises a condensing lens, a thermopile sensor(31), an internal sensor(32), an optical sensor(33), an amplifier(34), a low pass filter(35), A/D converters(36,37,38), a surface temperature sensor(39), a core temperature sensor(40), a controller(41), a memory(42), and a display(43). The thermopile sensor and internal sensor are included in one thermopile sensor module. The surface temperature sensor and the core temperature sensor are included within the digital signal processor to the firmware. The memory is composed of the nonvolatile memory. The controller is controlled the operation of the core temperature sensor and the surface temperature sensor according to the key input of user.

Description

Apparatus and method for detecting core temperature in infrared rays thermometer}

The present invention relates to an apparatus and method for detecting a core temperature applied to an infrared thermometer which receives, for example, minute infrared rays generated in the temporal artery of the forehead of a human and measures body temperature. .

Generally, a thermometer for measuring a human body temperature is classified into a contact thermometer and a non-contact thermometer, and the contact thermometer measures a human body temperature using, for example, alcohol and mercury. Done.

In addition, since the contact temperature measuring device is inserted into and contacted with, for example, a person's oral cavity or anus, and measures the body temperature, the patient feels uncomfortable, and thus a non-contact temperature measuring device is widely used at present.

On the other hand, the non-contact body temperature measuring instrument receives a minute infrared (IR) generated from a part of the human body, and measures the body temperature, for example, as shown in FIG. Includes a sensor unit 10, a display unit 11, a measurement button 12, and the like.

Then, the sensor unit 10, as shown in Figure 1, is inserted into the human ear (Insert), receives the infrared radiation emitted around the eardrum, and converts it into an electrical signal, thereby converting the corresponding body temperature Will be measured.

In addition, since the display unit 11 displays the body temperature measured by the sensor unit 10 by a number of LCDs or the like, as described above, the contact type body temperature inserted into and contacted with a person's oral cavity or anus, etc. Compared to the meter, patients feel less discomfort.

On the other hand, in recent years, as one of the non-contact body temperature measuring device, an infrared forehead temperature measuring device has been developed and released and commercialized. For example, as shown in FIG. 2, the infrared forehead temperature measuring device 200 includes a sensor unit ( 20), the display part 21, the measurement button 22, etc. are comprised.

In addition, as shown in FIG. 2, when the scan operation is performed for a predetermined time (for example, 3 to 5 seconds) while being in contact with a forehead surface of a human, For a predetermined time, the body temperature is measured by receiving the minute infrared rays generated in the temporal artery of the forehead.

In addition, since the display unit 21 displays the body temperature measured by the sensor unit 20 as a number on an LCD or the like, as described above, the contact type body temperature inserted into and contacted with a person's oral cavity or anus, etc. Compared to the measuring device, not only does the patient feel much less offensive, but also the patient feels much less offensive than in the infrared visceral temperature thermometer 100 which has to insert the sensor part into the ear.

However, the infrared forehead body temperature measuring device 200 as described above cannot properly receive the minute infrared rays generated in the temporal arteries of the forehead unless the sensor unit 20 is closely and vertically adhered to the forehead of a person. There is a problem that an error occurs in body temperature measurement.

In addition, since the sensor unit 20 is in close contact with the forehead of a person, the user must keep pressing the measurement button 22 for a predetermined time (eg, 3 to 5 seconds) to scan. There is a problem that you feel uncomfortable in use.

The present invention, for example, so that the sensor unit for receiving the fine infrared rays (Infrared Rays) generated in the temporal arteries of the forehead of the human for example, so that the accurate body temperature can be measured even in a state away from a predetermined distance without contacting the forehead of the human In addition, it is to provide an apparatus and method for detecting the center temperature in the infrared thermometer to more accurately detect the core temperature (Core Temperature), not the surface temperature of the human forehead.

In the infrared body temperature measuring apparatus according to the present invention, a center temperature detection device includes a sensor for detecting an atmospheric temperature Ta; A surface temperature detector for detecting the surface temperature Ts of the human forehead; And a center temperature detector for detecting a center temperature Tc of the forehead of the human forehead, wherein the center temperature Tc is Tc = B × (Ts-Ta) + Ta and B = (k1 × Ts) + detected by k2, wherein k1 and k2 are set to a constant value in advance,

In addition, k1 is a proportional constant, k2 is an offset value, k1 is set to a value smaller than k2,

In addition, k1 and k2 are respectively substituted with Tc = B × (Ts-Ta) + Ta after measuring the surface temperature Ts and the center temperature Tc in the state where atmospheric temperature Ta was adjusted. , The B value is calculated, and the calculated B value and the surface temperature (Ts) are substituted by B = (k1 × Ts) + k2 to be set in advance by an experimental result of calculating k1 and k2. ,

In addition, the center temperature detection method in the infrared thermometer according to the present invention, the first step of detecting the atmospheric temperature (Ta) and the surface temperature (Ts) of the human forehead; And detecting the center temperature Tc of the human forehead based on the atmospheric temperature Ta and the surface temperature Ts, wherein the center temperature Tc is Tc = B × (Ts -Ta) + Ta and B = (k1 × Ts) + k2, wherein k1 and k2 are preset to constant values,

In addition, k1 is a proportional constant, k2 is an offset value, k1 is set to a value smaller than k2,

In addition, k1 and k2 are respectively substituted with Tc = B × (Ts-Ta) + Ta after measuring the surface temperature Ts and the center temperature Tc in the state where atmospheric temperature Ta was adjusted. , The B value is calculated, and the calculated B value and the surface temperature Ts are substituted into B = (k1 × Ts) + k2 to be set in advance by an experimental result of calculating k1 and k2. .

The apparatus and method for detecting a central temperature in an infrared thermometer according to the present invention include, for example, a sensor unit for receiving minute infrared rays generated in the temporal artery of the human forehead, even in a state where a predetermined distance is removed without contacting the human forehead. In addition, it is possible to accurately measure the body temperature, as well as more accurately detect the core temperature (Core Temperature) rather than the surface temperature of the human forehead, thereby greatly improving the performance of the infrared thermometer.

1 illustrates a configuration of a general infrared whistle thermometer,
Figure 2 shows the configuration for a general infrared forehead body temperature meter,
Figure 3 shows an embodiment of an infrared thermometer to which the present invention is applied,
Figure 4 shows the configuration of an embodiment of the center temperature detection device in the infrared thermometer according to the present invention,
5 illustrates a derivation process of a center temperature detection equation according to the present invention,
6 and 7 illustrate experimental graphs and experimental data values according to the present invention,
8 is a flowchart illustrating an embodiment of a method for detecting a center temperature in an infrared body temperature meter according to the present invention.

Hereinafter, a preferred embodiment of the apparatus and method for detecting the center temperature in the infrared thermometer according to the present invention will be described in detail with reference to the accompanying drawings.

The center temperature detecting device and method according to the present invention, for example, as shown in Figure 3, a completely non-contact method for receiving infrared light generated from the surface of the forehead of the person at a distance away from the forehead of the person (for example, : Infrared thermometer (300) of No Touch & No Scan).

On the other hand, the infrared thermometer 300 is, for example, for the convenience of use, is produced in the shape of a camcorder of a transitor, LCD for temperature display (LCD) is disposed in the horizontal direction on the upper side of the handle, the user Even when holding the handle with your right hand, you can easily check the temperature displayed on the LCD.

In addition, the infrared thermometer 300, for example, in order to be able to precisely receive a minute infrared rays generated in the temporal artery of the forehead of the human for a predetermined distance, the thermo sensor which is a high sensitivity infrared thermal sensor The Thermopile Sensor Module is used.

The thermopile sensor module is mounted on a printed circuit board (PCB) disposed on a rear surface of the thermopile sensor module and electrically connected thereto, and a condenser lens (Lens) for condensing infrared rays is provided in front of the thermopile sensor module.

On the other hand, as shown in Figure 3, the infrared guide (IR Guide) in which the thermopile sensor module is inserted, for example, an aluminum material colored in black color by anodizing (Anodizing) is used, the The infrared guide concentrates the infrared rays generated in the forehead portion of the person to be measured, and blocks the inflow of unnecessary infrared rays to the surroundings.

In addition, in order to stably fix the thermopile sensor module inserted into the infrared guide, as shown in Figure 3, a rubber O-ring (O-Ring) and a fixed pipe (Pipe) is used, the printed circuit board, It is firmly fixed by a screw fastened on the rear surface of the infrared guide.

The infrared body temperature meter 300 includes, for example, an optical sensor installed as a sensor for measuring an atmospheric temperature, and an atmospheric temperature (eg, Ta) detected by the optical sensor, The center temperature (eg, Tc) of the human forehead is detected based on the surface temperature (eg, Ts) detected by the thermopile sensor module. The center temperature detection operation will be described in detail as follows.

Infrared body temperature measuring apparatus to which the center temperature detecting apparatus and method according to the present invention is applied, for example, as shown in FIG. 4, the condenser lens 10, the thermopile sensor 31, the internal sensor 32, the optical Sensor 33, amplifier 34, low pass filter 35, A / D converters 36, 37, 38, surface temperature detector 39, center temperature detector 40, controller 41, memory ( 42, and a display 43 or the like.

Meanwhile, the thermopile sensor 31 and the internal sensor 32 are included in one thermopile sensor module, and the surface temperature detector 39 and the center temperature detector 40 are digital. It may be configured to include a firmware (Firmware) in the signal processor (Digital Signal Processor), the optical sensor 33 may be replaced by another type of sensor for measuring the ambient temperature.

The memory 42 may be, for example, a nonvolatile memory such as a flash memory or an EEPROM, and the controller 41 may be configured according to a user key input. In addition, the surface temperature detector 39 and the center temperature detector 40 may be controlled by operation so as to accurately detect the central body temperature Tc rather than the surface temperature Ts of the forehead of a human being and display it on the display 43. .

On the other hand, the central temperature Tc of the human forehead is reduced in the process of penetrating the skin layers of the human forehead, and the surface temperature Ts of the human forehead is affected by the atmospheric temperature Ta, so that the thermal resistance modeling is performed. Expressed as (Thermal Resistance Modeling), for example, it is as shown in FIG.

For example, assuming that the heat transfer rate transferred from the center to the surface is 'gx', the conduction resistance of the first skin layer is 'R1', the conduction resistance of the second skin layer is 'R2', In addition, assuming that the radiation resistance in the air is 'R3', the heat transfer rate gx may be expressed by the following equations (1) and (2).

gx = (Tc-Ta) / (R1 + R2 + R3) .... Formula (1)

gx = (Tc-Ti) / R1 = (Ti-Ts) / R2 = (Ts-Ta) / R3 ... equation (2)

Where Tc is the center temperature, Ti is the internal temperature, Ts is the surface temperature, and Ta is the atmospheric temperature.

Moreover, following Formula (3), Formula (4), and Formula (5) can be derived based on said Formula (1) and Formula (2).

(Tc-Ta) / (R1 + R2 + R3) = (Ts-Ta) / R3 .... Equation (3)

(Tc-Ta) / (Ts-Ta) = (R1 + R2 + R3) / R3 .... Equation (4)

Tc = ((R1 + R2 + R3) / R3)) × (Ts-Ta) + Ta ... equation (5)

In addition, assuming that (R1 + R2 + R3) / R3 is, for example, the center temperature detection correction coefficient 'B', the following equation (6) can be derived.

Tc = B × (Ts-Ta) + Ta ... (6)

On the other hand, the correction coefficient B, which can be calculated through the experimental results, for example, as shown in Figure 6, in the state in which the atmospheric temperature Ta is adjusted to 20 degrees, 25 degrees, 30 degrees, respectively, the surface temperature When the test result of detecting the center temperature Tc by changing Ts, it can be seen that as the surface temperature Ts increases, the center temperature Tc increases.

As shown in Fig. 7, the correction coefficient B is calculated by substituting the atmospheric temperature Ta, the surface temperature Ts, and the center temperature Tc into the above formula (6) Tc = B x (Ts-Ta) + Ta. In the relationship between the correction coefficient B and the surface temperature Ts, when the surface temperature Ts increases, the correction coefficient B increases proportionally linearly, as follows. Can be derived.

B = (k1 × Ts) + k2 ... equation (7)

Where k1 is a proportional constant and k2 is an offset value.

Meanwhile, the proportionality constant k1 and the offset value k2 are calculated by substituting the detected surface temperature Ts and the correction coefficient B as shown in FIG. 7 into the above formula (7), for example, k1 is 0.03. , k2 may be calculated as 0.1 and satisfies (k1 <k2).

In the center temperature detector 40, equation (6) Tc = Bx (Ts-Ta) + Ta derived and calculated as described above, equation (7) B = (k1xTs) + k2, and Using k1 = 0.03 and k2 = 0.1, the center temperature Tc of the human forehead is more accurately detected.

For example, as shown in Fig. 8, the values of the formula (6) Tc = B x (Ts-Ta) + Ta and the formula (7) B = (k1 x Ts) + k2, and the k1 and k2 values, In the state stored in the center temperature detector 40 (S10), if a body temperature measurement operation is requested by a user's key input or the like (S11), the center temperature detector 40, detected by the surface temperature detector 39 The surface temperature Ts of the human forehead and the atmospheric temperature Ta detected by the optical sensor 33 are confirmed (S12).

Then, the surface temperature Ts and k1 = 0.03 and k2 = 0.1 stored in advance according to the experimental results are substituted into the equation (7) B = (k1 x Ts) + k2 to calculate the correction coefficient B. (S13) For example, when the surface temperature is Ts = 35 degrees, the correction coefficient is B = (0.03 x 35) + 0.1 = 1.15.

In the center temperature detector 40, the correction coefficient (for example, B = 1.15), the atmospheric temperature Ta, and the surface temperature Ts calculated as described above are expressed by the formula (6) Tc = B x (Ts-Ta). Substituting into + Ta, the center temperature Tc is detected (S14).

For example, if the correction coefficient is B = 1.15, the surface temperature is Ts = 35 degrees, and the atmospheric temperature is Ta = 20 degrees, the center temperature is Tc = 1.15 × (35-20) + 20 = 37.25 Becomes

Then, the detected center temperature Tc is displayed on the display 43 (S15), and when the power is not turned off (S16), when the body temperature measurement operation is requested again, as described above. A series of actions is performed again to accurately detect and display the center temperature, not the surface temperature of the human forehead.

On the other hand, in the surface temperature detector 39, the difference between the temperature detected by the thermopile sensor 31 and the temperature detected by the internal sensor 32 is detected by the surface temperature Ts. The surface temperature detection operation is a well-known technique that is already widely used in various types of infrared thermometers using a thermopile sensor module, and thus description thereof will be omitted.

For reference, in order to increase the detection accuracy with respect to the center temperature Tc, it is preferable to secure and analyze the experimental data described above with reference to FIG. 7 more abundantly and precisely to improve the accuracy of the correction coefficient B.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

100: infrared whistle temperature thermometer
200: infrared forehead body temperature meter
300: infrared thermometer
10,20: sensor unit 11,21: display unit
12,22: measuring button 30: condensing lens
31: Thermopile sensor 32: Internal sensor
34: Amplifier 35: Low Pass Filter
36,37,38: A / D converter 39: surface temperature detector
40: center temperature detector 41: controller
42: memory 43: display

Claims (6)

A sensor for detecting an ambient temperature Ta;
A surface temperature detector for detecting the surface temperature Ts of the human forehead; And
A central temperature detector for detecting the central temperature Tc of the human forehead,
The center temperature Tc is detected by Tc = B × (Ts-Ta) + Ta and B = (k1 × Ts) + k2,
The said k1, k2 are preset by a constant value, The center temperature detection apparatus in the infrared thermometer. The method of claim 1,
The k1 is a proportional constant, and the k2 is an offset value, and the k1 is set to a value smaller than the k2. The method of claim 1,
K1 and k2 measure the surface temperature Ts and the center temperature Tc in the state where the atmospheric temperature Ta is adjusted, and then substitute Tc = B × (Ts-Ta) + Ta, and B Calculate the value,
The center temperature in the infrared thermometer is characterized in that the calculated B value and the surface temperature (Ts) are substituted by B = (k1 x Ts) + k2 and set in advance by an experimental result of calculating k1 and k2. Detection device. Detecting the atmospheric temperature Ta and the surface temperature Ts of the human forehead; And
On the basis of the atmospheric temperature (Ta) and the surface temperature (Ts), comprising the two steps of detecting the central temperature (Tc) of the human forehead,
The center temperature Tc is detected by Tc = B × (Ts-Ta) + Ta and B = (k1 × Ts) + k2,
The k1 and k2 are preset to a constant value, characterized in that the center temperature detection method in the infrared thermometer. The method of claim 4, wherein
The k1 is a proportional constant, and the k2 is an offset value, wherein the k1 is set to a value smaller than the k2. The method of claim 4, wherein
K1 and k2 measure the surface temperature Ts and the center temperature Tc in the state where the atmospheric temperature Ta is adjusted, and then substitute Tc = B × (Ts-Ta) + Ta, and B Calculate the value,
The center temperature in the infrared thermometer is characterized in that the calculated B value and the surface temperature (Ts) are substituted by B = (k1 x Ts) + k2 and set in advance by an experimental result of calculating k1 and k2. Detection method.

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