KR101779761B1 - Temperature compensation thermometer and method using a distance measuring seneor - Google Patents

Temperature compensation thermometer and method using a distance measuring seneor Download PDF

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KR101779761B1
KR101779761B1 KR1020160013034A KR20160013034A KR101779761B1 KR 101779761 B1 KR101779761 B1 KR 101779761B1 KR 1020160013034 A KR1020160013034 A KR 1020160013034A KR 20160013034 A KR20160013034 A KR 20160013034A KR 101779761 B1 KR101779761 B1 KR 101779761B1
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distance
value
temperature
measurement
temperature value
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KR20170092024A (en
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배종홍
장성욱
김진완
김광복
김승기
우상호
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주식회사 코아리버
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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
    • G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
    • G01J5/0025—Living bodies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01J2005/0051—

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  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Nonlinear Science (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Radiation Pyrometers (AREA)

Abstract

The present invention relates to a temperature-compensated clinical thermometer and method, wherein a temperature-compensated clinical thermometer comprises: a temperature-measuring sensor for collecting infrared rays radiated from an object to be measured and calculating a target temperature value; A distance measuring sensor including a light emitting portion and a light receiving portion and detecting a time when the infrared ray emitted from the light emitting portion reaches the light receiving portion and calculating a distance value to the object to be measured; A calculation unit receiving the target temperature value from the temperature measurement sensor, receiving the distance value from the distance measurement sensor, calculating a final temperature value by executing a distance compensation operation on the target temperature value, And an output unit receiving and outputting the final temperature value from the operation unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature-compensated thermometer and method using a distance measuring sensor,

The present invention relates to a temperature correction thermometer and method using a distance measuring sensor, and more particularly, to a thermometer and a thermometer that corrects temperature by a distance compensating method of measuring a distance to a measurement object through a distance measuring sensor .

The non-contact type clinical thermometer is a thermometer that measures the temperature using an infrared ray in a state of being separated from the measurement target by a predetermined distance, and has an advantage that the temperature can be measured without directly contacting the measurement target.

However, since the non-contact type thermometer is distant from the object to be measured by a predetermined distance, different result factors are likely to be produced at different times by different external factors. In order to solve this problem, the users of the actual non-contact type thermometer take a method of obtaining the average value of the measured values through the repeated measurement as the measurement results.

The non-contact temperature sensor of Japanese Patent No. 5,708,217, which is a prior art document, is designed to reduce the sensitivity and error caused by infrared radiation, and uses a temperature-compensating thermal element for detecting the amount of heat from the external environment, And the temperature of the radiant infrared ray heat source (heat source) is measured based on the temperature rise of the infrared ray absorbing means detected by the infrared ray detecting means and the ambient temperature detected by the temperature compensating thermal element. That is, in the prior art, the ambient temperature is measured in order to compensate the lost infrared ray among the infrared rays emitted from the object to be measured, and the measured infrared ray heat amount is compensated to calculate the result. This prior art is also designed to improve the accuracy of the result by compensating for the loss due to external factors. However, it is difficult to reliably determine whether the correct result can be obtained by compensating for the infrared heat quantity lost by only the ambient temperature measurement, There is a question as to whether the compensation can be reduced.

Japanese Patent No. 5708217 (Dec. 06, 2012)

An object of the present invention is to solve the above-mentioned problems and to compensate the measured temperature based on more objective data. That is, it is an object of the present invention to provide a clinical thermometer and a method for measuring a distance from a measurement target using a distance measurement sensor to correct a measurement temperature result according to distance.

A temperature-compensated clinical thermometer, which is a first aspect of the present invention, includes a temperature-measuring sensor for collecting infrared rays radiated from an object to be measured and calculating an object temperature value; A distance measuring sensor including a light emitting portion and a light receiving portion and detecting a time when the infrared ray emitted from the light emitting portion reaches the light receiving portion and calculating a distance value to the object to be measured; A calculation unit receiving the target temperature value from the temperature measurement sensor, receiving the distance value from the distance measurement sensor, calculating a final temperature value by executing a distance compensation operation on the target temperature value, And an output unit receiving and outputting the final temperature value from the operation unit.

According to a second aspect of the present invention, there is provided a temperature correction method using a distance measuring sensor of a non-contact type thermometer, comprising: measuring a target temperature value using a temperature measuring sensor; Measuring a distance to a measurement object using the distance measurement sensor; Calculating a final temperature value by performing a distance compensation operation on the target temperature value using the distance value; And outputting the final temperature value.

Unlike the conventional non-contact type thermometer, the clinical thermometer of the present invention is advantageous in reducing the measurement error by improving the accuracy of the body temperature measurement result and eliminating the cumbersome repetitive measurement by performing the distance compensation calculation using the distance measurement sensor.

1 is a view showing a clinical thermometer and a measuring method according to an embodiment of the present invention.
2 is a block diagram showing the components of a clinical thermometer according to an embodiment of the present invention.
3 is a flowchart for explaining a method for measuring body temperature of a clinical thermometer according to an embodiment of the present invention.
4 is a graph illustrating a concept of distance compensation of a clinical thermometer according to an embodiment of the present invention.
FIG. 5A is a view for explaining the operation of the distance measuring sensor of a clinical thermometer according to an embodiment of the present invention, and FIG. 5B is a view showing an output signal and a measurement sensing signal measured by the distance measuring sensor .
Like reference numbers in the several drawings indicate like elements.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive. In this specification, when it is mentioned that a certain element includes an element, it means that it may further include other elements.

1 is a view showing a clinical thermometer and a measuring method according to an embodiment of the present invention. The clinical thermometer 100 of the present invention includes a temperature measurement sensor 110, a distance measurement sensor 120, and a measurement button 130. A thermistor for measuring the temperature of the sensor according to the ambient temperature, a display unit for displaying the measured body temperature, an LED display for indicating the measurement state, a power unit for supplying power, and the like. And a control unit for calculating the result, and a detailed internal configuration will be described with reference to Fig.

The thermometer 100 of the present invention is positioned so that the temperature measurement sensor 110 disposed at the front end faces the measurement object and operates the measurement button 130 to measure the temperature of the object to be measured Measure infrared rays. At this time, the distance between the temperature measurement sensor 110 and the measurement object is preferably 1 cm to 5 cm, and when the measurement distance is out of range, a warning sound may be sounded or a message indicating that measurement is not possible may be displayed on the display unit.

The temperature measuring sensor 110 is an infrared ray (IR) sensor that detects the physical quantity or the stoichiometric quantity such as the temperature, the pressure and the intensity of the radiation using infrared rays and changes the quantity of electricity to an electric quantity capable of signal processing. There is a kind of super-type, thermo file. In one embodiment, the temperature measurement sensor 110 of the present invention uses a thermopile, and a thermopile generates thermoelectric power according to infrared rays radiated by connecting a plurality of small thermocouples in series to detect a temperature difference And is advantageous in detection of a minute temperature difference. The temperature measurement sensor 110 may further include an amplification circuit for converting the detected infrared ray into a voltage value and for amplifying a weak voltage value.

The distance measuring sensor 120 is a sensor for measuring a distance to a measurement target, and includes a light emitting unit and a light receiving unit. When infrared rays are emitted from the light emitting unit, infrared rays reflected from the measurement object reach the light receiving unit, So as to derive the distance to the object to be measured. The distance measuring sensor 120 may be realized as a separate unit or integrated into one area.

In addition, the clinical thermometer 100 of the present invention may include a thermistor. The thermistor is a sensor whose resistance value changes according to the ambient temperature. The thermistor measures the temperature of the sensor itself by using the resistance value changed according to the ambient temperature and transmits it to the temperature measuring sensor. The temperature measurement sensor of the clinical thermometer 100 calculates a primary target temperature value by calculating the difference between the environmental temperature measured through the thermistor and the measured temperature value measured through the temperature measurement sensor 110. Next, a compensation temperature value according to the distance value measured through the distance measurement sensor 120 is obtained, and a compensation temperature value is added to the first resultant temperature value to obtain a final temperature result value.

As described above, the clinical thermometer 100 of the present invention performs the temperature value compensation process using the thermistor and the distance measuring sensor 120, unlike the operation of the non-contact type thermometer using infrared rays, Can be improved.

2 is a block diagram showing the components of a clinical thermometer according to an embodiment of the present invention. The thermometer 100 of the present invention includes a thermopile 210, a thermistor 220 and a distance measuring sensor 230 as a sensor unit and includes an operation unit 250 as an MCU (Micro Controller Unit) And an output unit 260 for outputting the resultant value. However, the configuration of the clinical thermometer 100 is not limited thereto, and may further include other components necessary for the body temperature measuring operation of the present invention.

In order to derive the body temperature measurement result of the present invention, the sensor unit acquires each measured value and converts it into an electrical signal. The sensor unit includes a thermopile 210 as a temperature measurement sensor for measuring the temperature of the measurement subject, A thermistor 220 for measuring the temperature of the sensor itself according to the temperature, and a distance measuring sensor 230 for measuring the distance to the measuring object. In the present embodiment, the clinical thermometer 100 is equipped with all three sensors, and is configured to collect each measured value and to calculate a final result value.

The thermopile 210 is a temperature measurement sensor for measuring the body temperature of a measurement object. The temperature measurement sensor receives infrared rays radiated from a measurement object, generates thermoelectric power according to the received infrared rays, converts the thermopile into a voltage value, . As described above, the thermopile 210 utilizes the principle of detecting the temperature difference between the self-temperature of the sensor and the measurement target by generating thermo-electric power according to infrared rays radiated by connecting a plurality of small thermocouples in series, Respectively. The measurement object temperature value acquired through the thermopile 210 is input to the operation unit 250 in an amplified form using an amplification circuit.

Specifically, the thermopile 210 converts the temperature difference of the sensor itself and the temperature of the measurement object into a voltage and outputs a target temperature value. For this, the sensor temperature value of the sensor itself is obtained by using the thermistor 220 whose resistance value changes according to the ambient temperature, and the target temperature value is calculated using the sensor temperature value and the temperature difference of the measurement object. That is, the target temperature value To can be expressed by the sum of the sensor temperature value Ts and the temperature difference value Ta of the target and the sensor (see Equation (1) below).

Figure 112016011322202-pat00001
... Equation (1)

The thermistor 220 is used to calculate a target temperature value of the thermopile 230 and is used to calculate the temperature value of the sensor. The resistance value is changed according to the ambient temperature. And obtains its own sensor temperature value (Ts). The thermistor 220 inputs the measured sensor temperature value to the operation unit 250. The sensor temperature value measured through the thermistor 220 is used to calculate a difference in temperature value of the measurement object through the temperature measurement sensor 210. The thermopile 210 is temperature compensated using the sensor temperature value and the temperature difference of the measurement object. The target temperature value is calculated. As an example, the thermistor 220 may be implemented to operate in conjunction with the thermopile 210 to deliver the sensor temperature value to the thermopile 210.

The distance measuring sensor 230 is a sensor for measuring the distance to the measuring object. 5A, the distance measuring sensor 230 includes a light emitting unit 510 and a light receiving unit 520. When the infrared ray is emitted from the light emitting unit 510, The reflected infrared rays reach the light receiving portion 520. 5 (b), the light receiving unit 520 generates the light receiving unit output signal 550 according to the reached infrared rays, and detects the falling edge of the measurement sensed signal based on the detecting threshold level edge and rising edge, and generates a measurement sense signal 540. [ The distance between the distance measurement sensor 230 and the measurement object 530 is calculated by calculating the time count from the infrared light emission of the generated measurement sense signal to the light reception. The measured distance value calculated through this process is used to compensate the target temperature value.

The calculation unit 250 is a control device that calculates the final result value by using the measured values inputted from the sensor units 210 to 230. The operation unit 250 collects at least one of the target temperature value, the sensor temperature value, and the distance measurement value from the sensor units 210 to 230 when the temperature measurement is started (for example, the operation of the measurement button 130). As an example, each measurement value can be collected at the same time or sequentially.

The calculation unit 250 performs a distance compensation operation using the target temperature value collected from the thermopile 210 and the distance measurement value collected from the distance measurement sensor 230. [ The operation unit 250 can obtain the target temperature value To 'obtained by amplifying the target temperature value To measured by the thermopile 210. [ The calculation unit 250 may store the temperature compensation data according to the distance difference in advance and compensate the target temperature value To 'based on the temperature compensation data.

Referring to the graph of the temperature compensation concept according to the distance in FIG. 4, when measuring the temperature of the measurement object (for example, human body temperature) using the non-contact type thermometer, A difference in value occurs. For example, when the actual body temperature 420 is constant at 36.65 degrees, the measured body temperature value 410 of the non-contact type thermometer is measured to be lower than the actual temperature 410 as the distance from the measurement object becomes longer. The measured body temperature value 420 is in inverse proportion to the distance as shown in the graph of FIG. Accordingly, the actual body temperature 420 and the measurement body temperature 410 have a predetermined temperature difference 430 according to the distance.

Actual Body Temperature (420) - Body Temperature (410) = Temperature Difference (430) ... Equation (2)

The calculation unit 250 holds the temperature compensation data corresponding to the distance in advance and stores the temperature difference value 430 in the distance compensation data. The distance compensation data may be stored in advance in the operation unit 250 by a designer in designing a clinical thermometer, or may be set to be periodically updated through a predetermined network.

The calculation unit 250 performs distance compensation on the target temperature value To 'using the distance compensation data. That is, the measurement distance value is acquired through the distance measurement sensor 230, and the distance compensation data? According to the measurement distance value is obtained. Next, the final temperature value T f is obtained by performing an operation of compensating the target temperature value To 'collected through the thermopile 210 with the distance compensation data β (see Equation (3) below).

Figure 112016011322202-pat00002
... Equation (3)

The calculating unit 250 transmits the calculated final temperature value Tf to the output unit 260 and the output unit 260 may display the final temperature value on a display unit (e.g., an LCD window) provided in the clinical thermometer . In another embodiment, when the body temperature measurement is impossible or the temperature value calculation is impossible, a remeasurement request message may be output or an error message may be output. The final temperature value can be measured on the display unit for a predetermined time and can be designed so that the user can intuitively observe the temperature measurement result by varying the background color of the display unit depending on whether the final temperature value is in the normal or abnormal category.

As described above, the clinical thermometer of the present invention is advantageous in reducing the measurement error by improving the accuracy of the body temperature measurement result and eliminating the cumbersome repetitive measurement by performing the distance compensation calculation using the distance measurement sensor unlike the conventional non-contact type thermometer have.

3 is a flowchart for explaining a method for measuring body temperature of a clinical thermometer according to an embodiment of the present invention. The body temperature measuring method can be implemented using the components 210 to 260 shown in FIG. 2. The body temperature measuring method of FIG. 3 will be described with reference to the components of FIG.

First, when the measurement of the non-contact type clinical thermometer of the present invention is started, the target temperature value by the temperature measuring sensor is measured (Step 310). As described above, the thermopile 210, which is a temperature measurement sensor, acquires the target temperature value. The thermopile 210 calculates the target temperature value by compensating the measured temperature value of the measurement target using the sensor temperature value measured through the thermistor 220. [

Simultaneously or sequentially with the measurement of the target temperature value, the clinical thermometer measures the distance to the measurement target using the distance measurement sensor 230 (step 320). As described above, the distance measuring sensor 230 includes a light emitting portion 510 and a light receiving portion 520. When the infrared ray is emitted from the light emitting portion 510, infrared rays reflected from the measurement object 530 are transmitted to the light receiving portion 520 . The light receiving unit 520 generates the light receiving unit output signal 550 in accordance with the infrared ray, and generates the measurement sensing signal 540 based thereon. The distance between the distance measurement sensor 230 and the measurement object 530 is calculated by calculating the time count from the infrared light emission of the generated measurement sense signal to the light reception.

The measurement information obtained through the thermopile 210 and the distance measurement sensor 230 is input to the operation unit 250. The operation unit 250 determines whether all of the measurement information necessary for calculating the final temperature value is collected (operation 330) . For example, it may be implemented to output a remeasurement message if all measured values are not collected, or to output an error message. In the case of the distance measurement, if the measurement is impossible because the distance is too large, a guidance message can be outputted to guide the measurable distance.

When the collection of the measurement information is completed, the calculation unit 250 performs a target temperature value compensation calculation according to the distance (step 350). As described above, the operation unit 250 holds the temperature compensation data in accordance with the distance in advance, stores the temperature difference value in accordance with the distance in the distance compensation data (?), And calculates the distance Compensation. That is, the distance measurement value is acquired through the distance measurement sensor 230, the distance compensation data? According to the measurement distance value is obtained, and the distance to the object temperature value To ' The compensation data (?) Is added to perform the distance compensation calculation, and the final temperature value (Tf) is obtained.

When the final temperature value is calculated, the operation unit 250 outputs the final temperature value to the output unit 260 and outputs the final temperature value to the user through the display unit (operation 360). For example, the measurement unit measured by the clinical thermometer of the present invention may be 0.1 [deg.] C and the error may be +/- 0.2 [deg.] C.

The present invention can improve the accuracy of the result of temperature measurement using the non-contact type thermometer through the above-described body temperature measuring method, and can obtain a reliable result in one measurement without repeated measurement. That is, in the thermopile of the present invention, the target temperature value is primarily compensated for by the ambient temperature using the thermistor, and the distance compensation is performed according to the distance measurement, thereby ensuring the accuracy of the result and minimizing the error can do.

However, as an additional function, it may include a function of providing a mean value of a plurality of measured results using a memory function and an arithmetic function when the user performs the repeated measurement twice or more because the body temperature result is not reliable . In addition, if the same result value or two or more error results are found in two or more measurements, a message of "additional measurement unnecessary" or "trust" result is output so that the user can trust the result value and perform additional measurement .

While the present invention has been described in detail in the foregoing for the purpose of illustration, it is to be understood that the components, their connections and relationships, and their functions are merely exemplary. In the present invention, each component may be implemented as a physically separated form or as an integrated form of one or more components as needed.

The present invention is not necessarily limited to these embodiments, as all the constituent elements constituting the embodiment of the present invention are described as being combined or operated in one operation. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Thermometer
110: Temperature measurement sensor
120, 230: Distance measuring sensor
130: Temperature measurement button
210: Thermopile
220: Thermistor
250:
260: Output section

Claims (16)

delete delete delete delete delete delete delete delete delete A temperature correction method using a distance measuring sensor of a non-contact type thermometer,
Measuring a target temperature value using a temperature measurement sensor;
Measuring a distance to a measurement object using the distance measurement sensor;
Calculating a final temperature value by performing a distance compensation operation on the target temperature value using the distance value; And
And outputting the final temperature value,
In the step of measuring the distance value to the measurement target,
When the distance is too long to measure, a guide message for guiding the measurable distance is output,
Further comprising the step of determining whether all of the measurement information necessary for calculating the final temperature value has been collected by the calculation unit between the step of measuring the distance value to the measurement object and the step of calculating the final temperature value,
And outputting a remeasurement message or an error message if the measurement information required for calculating the final temperature value is not collected as a result of the determination. 11. The method of claim 10,
Wherein the step of measuring the target temperature value comprises the step of calculating the target temperature value by using a target measurement value obtained by condensing the infrared ray emitted from the measurement target and a sensor temperature value measured through the thermistor, Way. 12. The method of claim 11,
Wherein the target temperature value is calculated as a sum of the sensor temperature value and a temperature difference value between the target measured value and the sensor temperature value. 11. The method of claim 10,
Wherein the calculation unit previously holds data relating to a temperature compensation value according to a distance from the measurement object. 14. The method of claim 13,
Wherein the temperature compensation value is a difference between an actual temperature value of the measurement object and a measured temperature value according to the distance value. 14. The method of claim 13,
Wherein the step of calculating the final temperature value comprises calculating a final temperature value by performing a distance compensation operation on the target temperature value using the temperature compensation value according to the distance value. 11. The method of claim 10,
Wherein the step of measuring the distance value includes the steps of generating a measurement sensing signal when the light receiving unit of the distance measuring sensor has a voltage equal to or higher than a predetermined reference at the time of infrared ray reception and calculating a time measured in the measurement sensing signal, And calculating a distance value.
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KR102316388B1 (en) 2021-02-25 2021-10-22 파이시스 주식회사 Apparatus for measuring skin temperature and temperature in non-contact manner
KR102305869B1 (en) 2021-06-15 2021-09-28 (주)이지템 Non-contact Thermometer and Driving Method Thereof

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