KR20110085039A - Apparatus and method for detecting surface temperature in infrared rays thermometer - Google Patents

Abstract

PURPOSE: A surface temperature detecting apparatus of an infrared ray temperature measuring device and a method for thereof are provided to precisely receive minute infrared ray at some distance away by using a thermopile sensor module of an infrared heat detection sensor of high-sensitivity. CONSTITUTION: A sensor detects the ambient temperature(Ta) within the infrared ray guide. A surface temperature sensor(39) detects the surface temperature(Ts) of forehead of man based on the temperature(Tt) detected by a thermopile sensor(31), the temperature(Ti) detected by an internal sensor(32), and the ambient temperature. The surface temperature is detected by the Ts=(Tt4-Ti4)×(A×Ta+B)+C. The A, B, and C are in advance instituted as the constant value.

Description

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

The present invention relates to an apparatus and method for detecting a surface 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, to provide an apparatus and method for detecting the surface temperature of the infrared thermometer to enable more accurate detection of the surface temperature (Surface Temperature) of the human forehead.

Surface temperature detection apparatus in the infrared body temperature measuring apparatus according to the present invention, the thermopile sensor module including a thermopile sensor and an internal sensor; A sensor for detecting an atmospheric temperature Ta in the infrared guide; And a surface temperature Ts of a human forehead based on a temperature Tt detected by the thermopile sensor, a temperature Ti detected by the internal sensor, and the atmospheric temperature Ta. And a surface temperature detector, wherein the surface temperature Ts is detected by Ts = (Tt ⁴ -Ti ⁴ ) × (A × Ta + B) + C, wherein A, B, and C are constants Characterized in that it is preset to a value,

In addition, A is a gain value for the infrared guide, B is an offset value of the infrared guide, and C is set to an offset value of the whole body temperature measuring instrument. ,

In addition, A, B, and C are detected by a thermopile sensor while changing the surface temperature Ts three times while the atmospheric temperature Ta in the infrared guide and the temperature Ti detected by the internal sensor are adjusted. After each temperature (Tt) is measured, it is set in advance by an experimental result of substituting Ts = (Tt ⁴ -Ti ⁴ ) x (A x Ta + B) + C to calculate the A, B, and C values. Characterized in that,

In addition, the method for detecting the surface temperature of the infrared thermometer according to the present invention includes a temperature Tt detected by a thermopile sensor in a thermopile sensor module and a temperature Ti detected by an internal sensor in the thermopile sensor module. And a first step of obtaining an atmospheric temperature Ta in the infrared guide; And detecting the surface temperature (Ts) of the human forehead based on the obtained temperatures (Tt, Ti, Ta), wherein the surface temperature (Ts) is Ts = (Tt ^4- Ti ⁴ ) × (A × Ta + B) + C, wherein A, B, and C are previously set to constant values,

In addition, A is a gain value for the infrared guide, B is an offset value of the infrared guide, and C is set to an offset value of the whole body temperature measuring instrument. ,

In addition, A, B, and C are detected by a thermopile sensor while changing the surface temperature Ts three times while the atmospheric temperature Ta in the infrared guide and the temperature Ti detected by the internal sensor are adjusted. After each temperature (Tt) is measured, it is set in advance by an experimental result of substituting Ts = (Tt ⁴ -Ti ⁴ ) x (A x Ta + B) + C to calculate the A, B, and C values. It is characterized by.

The surface temperature detection apparatus and method in the infrared thermometer according to the present invention, for example, even in a state in which the sensor portion for receiving the minute infrared rays generated in the temporal artery of the human forehead, without being in close contact with the forehead of the human being at a predetermined distance In addition, it is possible to accurately measure the body temperature, as well as more accurately detect the surface temperature (Surface Temperature) of the human forehead, it is possible to significantly improve 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 surface temperature detection apparatus in the infrared thermometer according to the present invention,
5 illustrates a surface temperature detection process according to the present invention,
6 and 7 illustrate the derivation process of the constant values (A, B, C) according to the present invention,
8 is a flowchart illustrating an embodiment of a method for detecting a surface temperature in an infrared thermometer according to the present invention.

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

In the surface temperature detecting apparatus and method according to the present invention, for example, as shown in FIG. : 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.

In addition, the infrared body temperature meter 300, for example, as a sensor for measuring the ambient temperature inside the infrared guide, an optical sensor (Optical sensor) is installed, the ambient temperature (eg, for example) detected by the optical sensor Ta) and the surface temperature (eg, Ts) of the human forehead are detected based on temperatures (eg, Tt and Ti) that are respectively hidden by the thermopile sensor and the internal sensor included in the thermopile sensor module. However, the surface temperature detection operation will be described in detail as follows.

Infrared body temperature measuring apparatus to which the surface temperature detecting apparatus and method according to the present invention is applied, for example, as shown in Figure 4, the condenser lens 10, the thermopile sensor 31, the internal sensor 32, 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. The surface temperature detector 39, the center temperature detector 40, and the like are controlled in operation. The present invention relates to surface temperature detection, and a technical description thereof will be omitted for the center temperature detection operation.

On the other hand, in the surface temperature detector 39, for example, as shown in FIG. 5, by the temperature detected by the thermopile sensor 31 (eg, Tt) and the internal sensor 32. By detecting the detected temperature (e.g. Ti) and the temperature (e.g. Ta) detected by the optical sensor that detects the atmospheric temperature in the infrared guide, the surface temperature (e.g. Ts) of the human forehead is detected. At this time, the following equation (1) for detecting the surface temperature is used.

Ts = (Tt ⁴ -Ti ⁴ ) × (A × Ta + B) + C ... equation (1)

Here, Ts is surface temperature, Tt is temperature detected by a thermopile sensor, Ti is temperature detected by an internal sensor, and Ta is temperature detected by an optical sensor.

A is a gain value for the infrared guide, B is an offset value of the infrared guide, and C is an offset value of the whole body temperature measuring instrument.

That is, in the surface temperature detector 39, the surface temperature is not simply detected as Ts = (Tt ⁴ -Ti ⁴ ), but the gain value A, the offset value B, and the atmospheric temperature Ta for the infrared guide are linear functions. In addition, the surface temperature can be detected more accurately by reflecting the surface temperature detection operation and reflecting the offset value C of the entire body temperature measuring instrument.

On the other hand, the A, B, C is preset to a specific constant value based on the experiment results performed in advance, for example, as shown in Figure 6, the internal temperature Ti and the atmospheric temperature Ta is fixed state , Ts1, Ts2 and Ts3 are measured, and the temperatures Tt1, Tt2 and Tt3 respectively detected by the thermopile sensor are measured and the above formula (1) Ts = (Tt ^4- Ti ⁴ ) x (A Substituting into x Ta + B) + C yields the following equation (2), equation (3) and equation (4).

Ts1 = (Tt1 ⁴ -Ti ⁴ ) × (A × Ta + B) + C ... equation (2)

Ts2 = (Tt2 ⁴ -Ti ⁴ ) × (A × Ta + B) + C ... equation (3)

Ts3 = (Tt3 ⁴ -Ti ⁴ ) x (A x Ta + B) + C ... (4)

When the above equations (2), (3) and (4) are summarized, the following equations (5), (6) and (7) are derived.

Ts1 = C + B (Tt1 ⁴ -Ti ⁴ ) + (A × Ta) × (Tt1 ⁴ -Ti ⁴ ) ... Equation (5)

Ts2 = C + B (Tt2 ⁴ -Ti ⁴ ) + (A × Ta) × (Tt2 ⁴ -Ti ⁴ ) ... Equation (6)

Ts3 = C + B (Tt3 ⁴ -Ti ⁴ ) + (A × Ta) × (Tt3 ⁴ -Ti ⁴ ) ... Equation (7)

And, for example, m1 = (Tt ^{1 4-} Ti ⁴ ), m 2 = Ta x (Tt ^{1 4-} Ti ⁴ ), m 3 = (Tt ^{2 4-} Ti ⁴ ), m ⁴ = Ta x (Tt ^{2 4-} Ti ⁴ ), Assuming m5 = (Tt ^{3 4} -Ti ⁴ ) and m ⁶ = Ta x (Tt ^{3 4} -Ti ⁴ ), equations (8), (9) and (10) are derived as follows.

Ts1 = C + Bm1 + Am2 ... equation (8)

Ts2 = C + Bm3 + Am4 ... (9)

Ts3 = C + Bm5 + Am6 ... equation (10)

Then, the following equations (11) and (12) are derived to calculate C, B, and A after expressing this in a matrix.

... 식(11)

... Equation (11)

C = det (K1) / det (K), B = det (K2) / det (K), A = det (K3) / det (K) ... Equation (12)

As shown in Fig. 7, det (K), det (K1), det (K2), and det (K2) are calculated as follows.

Therefore, while changing the surface temperature Ts to Ts1, Ts2, and Ts3 while the internal temperature Ti and the atmospheric temperature Ta are fixed, the temperatures Tt1, Tt2 and Tt3 respectively detected by the thermopile sensor are measured, and Equation (1) Substituting Ts = (Tt ⁴ -Ti ⁴ ) × (A × Ta + B) + C enables the calculation of A, B, and C as specific constant values, respectively.

In the surface temperature detector 39, Ts = (Tt ^4- Ti ⁴ ) x (A x Ta + B) + C and A, B, C values derived and calculated as described above are calculated. In this case, the surface temperature Ts of the human forehead can be detected more accurately.

For example, as shown in FIG. 8, the above formula (1) Ts = (Tt ^4- Ti ⁴ ) x (A x Ta + B) + C, and A, B, and C values are the surface temperature detectors. In the state stored in 39 (S10), if a body temperature measurement operation is requested by a user's key input or the like (S11), the surface temperature detector 39, the temperature Tt detected by the thermopile sensor and the internal The temperature Ti detected by the sensor and the temperature Ta detected by the optical sensor are obtained (S12).

Then, the Tt, Ti, Ta and A, B, and C values stored in advance by the experimental results are converted into the formula (1) Ts = (Tt ^4- Ti ⁴ ) x (A x Ta + B) + C. Substitute the surface temperature Ts (S13), and after the power is not turned off (S14), if the body temperature measurement operation is requested again, the above-described series of operations are performed again, the surface of the human forehead The temperature can be detected more accurately.

For reference, as described above, the present invention relates to surface temperature detection, and a technical description of the center temperature detection operation will be omitted.

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 thermopile sensor module including a thermopile sensor and an internal sensor;
A sensor for detecting an atmospheric temperature Ta in the infrared guide; And
A surface for detecting the surface temperature Ts of the human forehead based on the temperature Tt detected by the thermopile sensor, the temperature Ti detected by the internal sensor, and the atmospheric temperature Ta. Including a temperature detector,
The surface temperature Ts is detected by Ts = (Tt ⁴ -Ti ⁴ ) × (A × Ta + B) + C,
The said A, B, C is preset by a constant value, The surface temperature detection apparatus in the infrared thermometer. The method of claim 1,
A is a gain value for the infrared guide, B is an offset value of the infrared guide, and C is set to an offset value of the entire body temperature measuring instrument. Surface temperature detection device in body temperature meter. The method of claim 1,
The temperatures A, B, and C are temperatures detected by the thermopile sensor while changing the surface temperature Ts three times while the atmospheric temperature Ta in the infrared guide and the temperature Ti detected by the internal sensor are adjusted. After each measurement of (Tt), it is set in advance by an experimental result of substituting Ts = (Tt ⁴ -Ti ⁴ ) x (A x Ta + B) + C to calculate A, B, and C values. Surface temperature detection apparatus in the infrared thermometer. Obtaining a temperature Tt detected by the thermopile sensor in the thermopile sensor module, a temperature Ti detected by the internal sensor in the thermopile sensor module, and an atmospheric temperature Ta in the infrared guide; And
On the basis of the obtained temperatures (Tt, Ti, Ta), comprising the step of detecting the surface temperature (Ts) of the human forehead,
The surface temperature Ts is detected by Ts = (Tt ⁴ -Ti ⁴ ) × (A × Ta + B) + C,
The said A, B, C is preset by a constant value, The surface temperature detection method in the infrared thermometer. The method of claim 4, wherein
A is a gain value for the infrared guide, B is an offset value of the infrared guide, and C is set to an offset value of the entire body temperature measuring instrument. Method for detecting surface temperature in a body temperature meter. The method of claim 4, wherein
The temperatures A, B, and C are temperatures detected by the thermopile sensor while changing the surface temperature Ts three times while the atmospheric temperature Ta in the infrared guide and the temperature Ti detected by the internal sensor are adjusted. After each measurement of (Tt), it is set in advance by an experimental result of substituting Ts = (Tt ⁴ -Ti ⁴ ) x (A x Ta + B) + C to calculate A, B, and C values. Surface temperature detection method in the infrared thermometer.

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