KR102273942B1 - Non-contact infrared thermometer - Google Patents

Abstract

The present invention relates to a non-contact infrared thermometer which comprises: a body unit (110); an infrared temperature sensor (120) which is disposed on one surface of the body unit (110); an infrared guide unit (130); a light irradiation unit (200) which is disposed on one surface of the body unit (110); and a visible light guide unit (210). Light having a wavelength in a visible region is emitted from the light irradiation unit (200), so emitted visible light is irradiated to the outside along the visible light guide unit (210) to allow a measurer to quickly determine the distance at which a correct temperature can be measured.

Description

Non-Contact Infrared Thermometer {NON-CONTACT INFRARED THERMOMETER}

The present invention relates to a non-contact infrared thermometer, and more particularly, to a non-contact infrared thermometer having an optical system indicating an optimized distance between the thermometer and an object to be measured.

Conventionally, as a means for measuring body temperature, a contact thermometer such as a mercury thermometer and an infrared thermometer, and a non-contact thermometer for measuring the surface temperature of a forehead or temple using an infrared sensor are used. In this case, as the contact thermometer is in direct contact with the body, there is a possibility of causing a virus or skin infection. Accordingly, in order to measure the body temperature of a large number of persons through the contact thermometer, it is inconvenient to have to disinfect it for the next use after one use.

Accordingly, a non-contact thermometer that measures the body temperature of a large number of people in a faster time by omitting the disinfection process through non-contact measurement is widely used. However, the non-contact thermometer has a problem in that the body temperature is measured only when an appropriate distance is maintained in the forehead or temple. To elaborate, the non-contact thermometer has a problem in that the body temperature is not accurately measured when it is deviating from the appropriate distance, and it is difficult for the measurer to measure the appropriate distance. There are problems that arise.

Accordingly, Korean Patent Application Laid-Open No. 10-2016-0015785 (“Apparatus and method for improving accuracy in non-contact body temperature measurement,” published on February 15, 2016) discloses a method using a camera module to solve the above problems. has been At this time, in the document, when the non-contact body temperature is measured, the camera module determines whether the focus is matched, and the temperature output when the focus point is matched is controlled to be determined as the temperature of the subject. However, in order to include a camera in a commonly used infrared thermometer, there is a problem that leads to an increase in the cost of many products.

In addition, in Korean Patent Laid-Open Publication No. 10-2017-0011521 (“Smart Thermometer and Temperature Calculation Method of Thermometer,” published on February 2, 2017), the temperature measured from the infrared temperature sensor through the proximity sensor that detects the distance to the target object A technique for correcting is disclosed. Here, in addition to the problem of increasing the cost of the product including the proximity sensor, the above document has a problem in that it is difficult to popularize it because it is necessary to use a more high-efficiency and high-cost product to increase the precision of the proximity sensor.

KR 10-2016-0015785 A (“Apparatus and method for improving the accuracy of non-contact body temperature measurement”) 2016.02.15. open KR 10-2017-0011521 A (“Smart thermometer and temperature calculation method of thermometer”, published on February 2, 2017)

The present invention has been devised to solve the above problems, and an object of the present invention is to improve accuracy while improving accuracy by providing an infrared temperature sensor for measuring temperature and a light irradiation unit for accurately indicating the distance between the forehead It is to provide a non-contact infrared thermometer capable of avoiding contact with the surface of an object to be measured due to carelessness of a measurer.

A non-contact infrared thermometer 100 of the present invention for achieving the above object includes a body portion 110; an infrared temperature sensor 120 disposed on one surface of the body 110; and an infrared guide unit 130 ; a light irradiation unit 200 disposed on one surface of the body unit 110; and a visible light guide unit 210 , wherein light having a visible wavelength is emitted from the light irradiation unit 200 , and the irradiated visible light may be irradiated to the outside along the visible light guide unit 210 .

In addition, in the present invention, the light irradiation part 200 and the visible light guide part 210 are each made of a pair, so that the pair of the visible light guide parts 210 are opposite to each other with the infrared guide part 130 as the center. may be spaced apart.

In addition, the infrared temperature sensor 120 may be characterized in that the measurement distance is set between 0 cm and Ncm, and the distance at which the visible light irradiated from the pair of visible light guide parts 210 does not overlap each other is Ncm or less.

In addition, the present invention may be characterized in that the infrared guide portion 130 and the visible light guide portion 210 has a conical shape in which the diameter of the hole increases toward the outer surface.

In addition, the present invention may be characterized in that the infrared guide portion 130 has a conical shape with a larger hole in diameter toward the outer surface, and the visible light guide portion 210 has a slit shape.

In addition, the non-contact infrared thermometer of the present invention includes a display 140 disposed on the outer surface of the body 110 to output data; and a switch 150 disposed on the outer surface of the body 110 to input a signal; may further include.

In addition, the infrared temperature sensor 120 includes a thermistor for measuring the surrounding environment temperature and an infrared sensor for measuring the temperature of the object to be measured, and the data of the infrared sensor is the data of the thermistor. It may be characterized as being compensated.

In addition, the light irradiation unit 200 may be characterized as a red light LED having an output wavelength between 630 nm±10 nm.

The non-contact infrared thermometer of the present invention has an advantage in that the measurement error is further reduced because the measurer can intuitively grasp the correct measurement distance through the light irradiation unit. Furthermore, the non-contact infrared thermometer of the present invention has the advantage of enabling a more reliable temperature measurement of an object to be measured through a plurality of slit-type visible light guides and significantly reducing the measurement time.

The non-contact infrared thermometer of the present invention can be used more universally because it can reduce the manufacturing cost while increasing user convenience, and it is convenient by adding functions that can be utilized by the measurer, such as a temperature compensation function and data search through the thermistor. There is an improvement advantage.

1 is a view showing a body temperature measurement method of a non-contact infrared thermometer according to an embodiment of the present invention.
FIG. 2 is a graph showing changes in body temperature changed by a non-contact infrared thermometer according to an embodiment of the present invention and a distance between the forehead.
3 is a view showing a non-contact infrared thermometer to which a light irradiation part is attached according to an embodiment of the present invention;
4 is a view showing a non-contact infrared thermometer in which the paths of the infrared temperature sensor and the light irradiation system are matched according to an embodiment of the present invention.
5 and 6 are views showing a non-contact infrared thermometer according to an embodiment of the present invention.
7 is a block diagram of a non-contact infrared thermometer according to an embodiment of the present invention.

Hereinafter, a non-contact infrared thermometer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The drawings introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those of ordinary skill in the art to which this invention belongs (hereinafter referred to as "those skilled in the art"). Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms. Also, like reference numerals refer to like elements throughout.

If there is no other definition in the technical terms and scientific terms used at this time, it has the meaning commonly understood by those of ordinary skill in the art, and in the following description and accompanying drawings, known functions and configurations that may unnecessarily obscure the subject matter of the present invention. A description thereof will be omitted.

1 to 4 relate to a non-contact infrared thermometer according to an embodiment of the present invention. FIG. 1 is a view showing a method for measuring body temperature of a non-contact infrared thermometer, and FIG. 3 is a diagram showing a non-contact infrared thermometer with a light irradiator attached, and FIG. 4 is a diagram showing a non-contact infrared thermometer matching the paths of the infrared temperature sensor and the light irradiator.

Referring to FIG. 1 , the non-contact infrared thermometer 100 of the present invention may include a body part 110 , an infrared temperature sensor 120 , an infrared guide part 130 , a display 140 , and a switch 150 . have. And the non-contact infrared thermometer 100 of the present invention may be spaced apart to measure the body temperature of the subject 10, and in the following description, the subject 10 consists of the subject and measures the forehead portion of the non-contact type. It will be described with reference to the thermometer 100 .

The infrared temperature sensor 120 and the infrared guide part 130 may be disposed on one surface of the body part 110 , and the infrared guide part 130 is disposed in the direction of one surface of the infrared temperature sensor 120 , radiation can be condensed. Here, the infrared guide part 130 may have a conical shape inside, and an infrared filter may be disposed inside the infrared guide part 130 to transmit infrared light. And when the infrared radiation wave radiated from the skin of the measurement target 10 is detected by the infrared temperature sensor 120, the surface of the measurement target 10 is the bottom of the cone, and the infrared temperature sensor 120 has the cone of the cone. It can be entered as a vertex.

L shown in FIG. 1 may be an optimized distance from the infrared temperature sensor 120 to the target 10, and A may be an optimized area of the target 10 spaced apart by the L. In addition, A' and A'' are areas indicating that the area is deviated from the optimized area A as L increases, and the thermal radiation emitted from the measurement object 10 may be conically condensed toward the infrared temperature sensor 120 . indicates In addition, when the device is turned on through the switch 150 , the radiation wave emitted from the measurement target 10 operates the infrared temperature sensor 120 , and the measured temperature may be output on the display.

A 'shown in FIG. 1 corresponds to the surface area of the object 10 when the infrared temperature sensor 120 is positioned at a distance L' apart, and A'' is the infrared temperature sensor 120 ) may correspond to the surface area of the object 10 when located at a distance spaced apart by L''. That is, the L, L', L'' and A, A', A'' may satisfy the following Relations 1 and 2, respectively.

[Relational Expression 1]

[Relational Expression 2]

Referring to FIG. 2 , the temperature change according to the distance to the forehead of the subject does not decrease from the moment the distance from 0 cm, which is the contact distance, increases, but the temperature may be maintained up to a certain distance. Here, it is assumed that the constant distance at which the temperature is maintained is 7 cm and that the body temperature is 36.5 ° C. It was measured that a constant temperature could be maintained between 0 cm and 7 cm, and a linear decrease as shown in Equation 1 below was observed when spaced apart by 7 cm or more.

[Equation 1]

Here, x is the distance between the non-contact infrared thermometer and the forehead of the object to be measured, and y may be the temperature of the object to be measured measured by the infrared temperature sensor of the non-contact infrared thermometer. Equation 1 above may compensate for the temperature according to the distance change through the operation circuit, but a problem may occur that leads to weighting of the measurement error. A detailed description of this is as follows.

All objects have a temperature, and all objects can have a temperature with the maximum peak wavelength corresponding to the temperature of the object to be measured. According to Wien's law, the wavelength of the maximum electromagnetic wave radiated by the net may have the following Equation (2).

[Equation 2]

(From here,

: 최대 전자기파 파장,

: the maximum electromagnetic wave wavelength,

: 피측정물의 절대온도)

: absolute temperature of the measurement object)

And the temperature measurement using infrared rays can be calculated by Equation 3 below, which is the Stefan-Boltzmann law.

[Equation 3]

(From here,

: 전기적 신호의 크기,

: the size of the electrical signal,

: 피측정물의 면적,

: area of the object to be measured,

: 피측정물의 복사율,

: emissivity of the object to be measured,

: 슈테판-볼츠만 상수,

: Stefan-Boltzmann constant,

: 피측정물의 표면온도,

: surface temperature of the measurement object,

: 적외선 온도센서 주변 온도)

: Infrared temperature sensor ambient temperature)

)은 피측정물의 사람의 피부인 경우 대략 0.98의 값을 가질 수 있다. 그리고 상기 피측정물의 면적(A)으로 인해서 많은 측정오차가 발생될 수 있다. 상술한 바와 같이 상기 A가 측정하고자 하는 부위인 경우, A' 및 A''와 같이 피측정물의 면적이 보다 넓어지면 측정된 온도 값이 감소될 수 있다. 이에 반하여 A의 측정 면적 보다 좁혀가면서 피측정물의 표면 온도를 측정하는 경우에는, 상기 A내의 범위 내에서

이 일정하게 유지될 수 있다.At this time, the emissivity (

) may have a value of approximately 0.98 in the case of human skin of the measurement target. In addition, many measurement errors may occur due to the area A of the object to be measured. As described above, when A is a region to be measured, the measured temperature value may be reduced when the area of the object to be measured becomes wider as shown in A' and A''. On the other hand, when measuring the surface temperature of the object to be measured while narrowing the measurement area of A, within the range of A

This can be kept constant.

Accordingly, a constant temperature may be output between 0 cm and 7 cm, which is an area of L, which is an optimized distance. As such, if the distance of the non-contact infrared thermometer is accurately maintained within the area of the object to be measured, the accurate temperature of the object to be measured can be calculated. However, if the temperature is measured at L' or L'', which is out of the range of L, which is the optimal distance, the measurement target area includes the forehead, eyes, eyebrows, and nose. Since it is measured, it is difficult to calculate the exact temperature of the object to be measured.

Referring to FIG. 3 , the path of infrared light when the infrared radiation emitted from the object to be measured is incident on the infrared temperature sensor 120 is shown in the form of a dot-dash line cone. In fact, since the path of this cone-shaped infrared light is invisible to the naked eye, the measurement area may not be accurately known, and thus the value may be different every time it is measured. Accordingly, the non-contact infrared thermometer of the present invention may further include a light irradiation unit 200, and the light irradiation unit 200 is harmless to the body and has no effect on the infrared sensor. . For example, the light irradiation unit 200 may be composed of a red LED having a wavelength of about 630 nm. In addition, in the present invention, since the light irradiation unit 200 is installed to match the path of the infrared light, the part to be measured can be accurately displayed, so that an artificial error caused by the measurement can be prevented in advance. The light path of the light irradiation unit 200 is indicated by a dotted line in the drawing, and the light path 21 of the infrared temperature sensor 120 and the light path 22 of the light irradiation unit 200 are configured to coincide with each other in a certain area. can be

Referring to FIG. 4 , the non-contact infrared thermometer of the present invention may further include a visible light guide unit 210 for guiding the light emitted from the light irradiation unit 200 together with the light irradiation unit 200 . In addition, the non-contact infrared thermometer of the present invention includes the infrared temperature sensor 120 and an infrared guide part 130 having a cone shape therein, and is installed inside the infrared guide part 130 and transmits only light in the infrared region. A filter 131 may be further included. In addition, infrared radiation emitted from the object to be measured is indicated by a dashed-dotted line, and the surface area of the object to be measured corresponding to each interval L, L', and L'' may correspond to Ar, Ar', and Ar''. In addition, the visible light generated by the light irradiation unit 200 is indicated by a dotted line, and the area of the visible light region corresponding to L, L', and L'' may correspond to AL, AL', and AL''. And as the infrared temperature sensor 120 and the light irradiator 200 are adjacent to each other, Ar, Ar', Ar'' and AL, AL', AL'' may coincide with each other. For example, an LED is connected to the end of the optical fiber. It can also be matched by making the light come out from the opposite end. Accordingly, in the present invention, when the device is switched on, the light in the visible light region is irradiated from the light irradiation unit 200, and when the target is approached, the size can be seen on the surface of the target as much as an effective area. And since the size of the non-contact infrared thermometer of the present invention is reduced when approaching the object to be measured. If the visible light area is larger than the measurement area, it can be set within the effective range by approaching the object to be measured.

5 and 6 relate to a non-contact infrared thermometer according to an embodiment of the present invention, and FIGS. 5 and 6 are a perspective view and a plan sectional view of a non-contact infrared thermometer according to various modifications.

5-(a) and 5-(b), the non-contact infrared thermometer 200 of the present invention includes a body part 110, an infrared temperature sensor 120, an infrared guide part 130, and a light. It may include an irradiation unit 200 and a visible light guide unit 210 . And the infrared temperature sensor 120 and the infrared guide part 130 are modularized with each other and disposed on one surface of the body part 110, and the light irradiation part 200 and the visible light guide part 210 are also modularized with each other, so that the body It may be disposed on one surface of the unit 110 . In addition, the infrared guide part 130 may be disposed at the center of one surface of the body part 110 , and the visible light guide part 210 may be spaced apart from the body part 110 to the outside. In FIG. 5 , the light irradiation part 200 and the visible light guide part 210 are illustrated by example being disposed on the upper side of the infrared guide part 130 . In addition, the visible light irradiated from the light irradiation unit 200 may illuminate the surfaces 11 and 12 of the object through the conical visible light guide unit 210 . Then, the measurer can determine whether the data being measured from the infrared temperature sensor 120 through the surfaces 11 and 12 is correct.

In addition, the body portion 110 of the present invention may look beautiful in appearance through the exterior cover, and the display 140 and the switch 150 may be disposed on the outer surface of the body portion 110 . And referring to FIG. 5-(b) with the upper body removed, the body part 110 is composed of an upper and lower body, and electronic components including a micro controller unit (MCU) can be mounted therein. And the upper body and the lower body of the body portion 110 may be detachably coupled to each other through the fastening member (160).

Referring to FIG. 6 , the present invention may include a plurality of light irradiation units 200 and a visible light guide unit 210 . In this case, the plurality of light irradiation units 200 and the visible light guide unit 210 may be spaced apart from each other in opposite directions with respect to the infrared guide unit 130 disposed at the center of one surface of the body unit 110 . In addition, the visible light guide part 210 may be formed in a conical shape or a slit shape, and the surfaces 13-1 and 13-2 of the target object illuminated through each of the pair of infrared guide parts 130 do not coincide with each other. It may be set to be a distance from which correct data is extracted. That is, the pair of light irradiation units 200 spaced apart from each other around the infrared guide unit 130 do not overlap each other when approaching the object to be measured, and the visible light overlaps each other at a certain distance as they move away from each other. . At this time, according to the present invention, the distance up to which the visible light does not overlap each other can be set as a distance at which the infrared temperature sensor 120 can measure the temperature correctly.

In addition, the switch 150 may include a plurality of keys, and three keys 151 , 152 , 153 consisting of Key 1 151 , Key 2 152 , and Key 3 153 will be described as examples. . Key 1 (151) can control the on/off of the entire device, and the Key 1 (151) can control the operation of the infrared temperature sensor 120 . And when the Key 1 (151) is not pressed or is controlled to Off, the infrared temperature sensor 120 is maintained in a sleep mode to minimize power consumption. In addition, the infrared temperature sensor 120 is operated while the Key 1 (151) is pressed or pressed, and the light irradiation unit 200 can irradiate visible light. Accordingly, visible light may be projected onto the surface 13 of the object to be measured. At this time, if the infrared temperature sensor 120 measures the data correctly, the measurer can be informed through a notification means such as sound. Accordingly, the non-contact infrared thermometer 100 of the present invention may further include a sound means such as a buzzer. have. In this case, the non-contact infrared thermometer 100 of the present invention may include a storage device therein, and may store a plurality of temperature information. Accordingly, the measurer may view the measurement information before or after the Key 2 152 and Key 3 153 , and the temperature information may be output to the display 140 .

7 is a non-contact infrared thermometer according to an embodiment of the present invention, and is a block diagram of the non-contact infrared thermometer.

Referring to FIG. 7 , the non-contact infrared thermometer of the present invention may include a temperature sensor, a noise filter, an amplifier, an analog-digital converter (ADC), and a microprocessor. Here, the temperature sensor may include a thermistor and an infrared sensor. In addition, the thermistor and the infrared sensor may be respectively connected to the microprocessor including an MCU. And when the measurer presses the switch as described above, the temperature measurement of the object to be measured can be started, and the microprocessor can measure the ambient environment temperature through the output value of the thermistor. At this time, the output value of the thermistor may be noise removed and converted into a digital signal through a noise filter, amplifier, and ADC connected between the thermistor and the microprocessor. In addition, a bias can be applied using a high-precision constant current supply for precise temperature measurement using the thermistor including the bias for the thermistor and having a resistance value change characteristic according to temperature. In addition, the microprocessor can measure the temperature of the object to be measured using the infrared sensor, and the noise filter, amplifier, and ADC connected between the infrared sensor and the microprocessor can remove noise and convert it into a digital signal. have. In addition, the microprocessor of the present invention can compensate the temperature value of the object to be measured by using the environmental temperature measurement value when both the ambient environmental temperature and the temperature of the object to be measured are measured. Then, the temperature value of the measured object for which the temperature compensation has been completed is output on a display such as an LCD so that the measurer can check it. In addition, the above values may be stored in a memory device such as an EEPROM. Here, the value stored in the EEPROM may be maintained even when the power of the system is turned off, or may be formed so that the stored data can be checked on the LCD.

The non-contact infrared thermometer of the present invention may have a storage temperature check function. That is, the measurer can check the data stored in the EEPROM by using the switch, and can also search for the data through the switch of the body part. In addition, data may be continuously stored in the EEPROM according to the measured time, and the user may check data displayed for each measured time.

The non-contact infrared thermometer of the present invention may include a battery management function. That is, the non-contact infrared thermometer of the present invention may include a battery therein, and the battery may be a rechargeable battery capable of charging and discharging. Here, the battery is continuously discharged while the system is running, and the output voltage may be lowered due to the discharge. Accordingly, the present invention can maintain a constant voltage output through a DC/DC converter in order to prevent system driving from becoming unstable due to a low output voltage. And when the battery voltage is continuously discharged and the DC/DC converter is lowered to a voltage at which it is impossible to output a constant voltage, the microprocessor can prevent malfunction by maintaining the system in the RESET state using the built-in Brownout detector. In addition, the microprocessor may periodically measure the output voltage of the battery using an ADC while the system is running, and output a 'low voltage warning message' to the LCD when it falls below a defined voltage.

100: non-contact infrared thermometer
110: body part
120: infrared temperature sensor
130: infrared guide unit
140: display
150: switch
200: light irradiation unit
210: visible light guide unit

Claims (8)

body part 110;
an infrared temperature sensor 120 disposed on one surface of the body 110 and detecting thermal radiation radiated from the object 10; and an infrared guide unit 130 disposed in the direction of one surface of the infrared temperature sensor 120 and guiding the infrared rays emitted from the object to be measured when the infrared temperature sensor 120 is incident thereon.
a light irradiator 200 disposed on one surface of the body 110 and irradiated with light in a visible light region; and a visible light guide unit 210 for guiding the light irradiated from the light irradiation unit 200;
The visible light irradiated from the light irradiation unit 200 is irradiated to the outside along the visible light guide unit 210,
The light irradiation unit 200 and the visible light guide unit 210 are configured in plurality, and the plurality of light irradiation units 200 and the visible light guide unit 210 are the infrared guides disposed in the center of one surface of the body unit 110 . It is spaced apart from each other in opposite directions around the part 130,
The infrared temperature sensor 120 has a measurement distance set between 0 cm and 7 cm,
A non-contact infrared thermometer (100), characterized in that the distance at which the visible light irradiated from the pair of visible light guide units (210) does not overlap each other is 7 cm or less.
delete delete According to claim 1,
The non-contact infrared thermometer (100), characterized in that the infrared guide part (130) and the visible light guide part (210) have a conical shape in which the diameter of the hole increases toward the outer surface.
According to claim 1,
The infrared guide part 130 has a conical shape in which the diameter of the hole increases toward the outer surface,
The non-contact infrared thermometer (100), characterized in that the visible light guide part (210) is a slit type.
According to claim 1,
a display 140 disposed on the outer surface of the body 110 to output data;
a switch 150 disposed on the outer surface of the body 110 to input a signal;
A non-contact infrared thermometer 100 further comprising a.
According to claim 1,
The infrared temperature sensor 120,
Comprising a thermistor (Thermistor) for measuring the ambient temperature and an infrared sensor (Thermopile Sensor) for measuring the temperature of the object to be measured,
The non-contact infrared thermometer (100), characterized in that the data of the infrared sensor is compensated with the data of the thermistor.
According to claim 1,
The light irradiation unit 200,
A non-contact infrared thermometer (100), characterized in that it is a red light LED having an output wavelength between 630 nm±10 nm.

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