KR200250432Y1 - Non-contact type temperature measuring device using ultra sonic - Google Patents

Abstract

The present invention relates to a non-contact temperature measuring device using ultrasonic waves, the hollow connection pipe (2) is provided with an adhesive portion (2b) in close contact with the surface of the measurement object (1) on one side and a reflection plate (2a) is installed at a predetermined position inside ; Ultrasonic sensor (3) installed on the other side of the connecting pipe (2); And a time calculation unit 4a and a time calculation unit 4a which are connected to the ultrasonic sensor 3 to calculate a time when the ultrasonic wave transmitted from the ultrasonic sensor 3 is reflected by the reflector 2a and returns. The speed calculation unit 4b for calculating the ultrasonic speed in the connecting pipe 2 using the reflection time obtained in the above, and the temperature conversion for obtaining the air temperature in the connecting pipe 2 from the ultrasonic speed obtained therefrom. Comprising the calculation unit 4 of the section (4c), has the effect that can be used regardless of the constraints of the installation location and the conditions of the surrounding environment.

Description

Non-contact type temperature measuring device using ultra sonic

The present invention relates to a non-contact temperature measuring apparatus using ultrasonic waves, and more particularly, to a non-contact temperature measuring apparatus using ultrasonic waves that can be used regardless of the constraints of the installation place and the surrounding environment.

In general, a thermometer used for industrial measurement is composed of a temperature measuring unit for sensing a temperature, a display unit for directly or indirectly displaying a temperature detected by the temperature measuring unit, and a conductor or pipe connecting the temperature measuring unit to the display unit.

The temperature measurement part is classified into a contact type and a non-contact type depending on whether the temperature is measured by directly contacting the object under test or by measuring the temperature without contact.

The contact method is a method of sensing the temperature of the object under measurement by contacting the temperature measuring part to the object under test to measure the temperature. In the temperature measurement by this method, the measurement accuracy depends on the degree of contact between the temperature sensing part and the measuring object. That is, when the temperature measuring part cannot be brought into contact with the measurement object, temperature measurement is impossible, and when the measurement object is affected by the contact, there is a problem in that a large error occurs.

The non-contact type detects radiation energy, that is, light or heat, radiated from a high-temperature measured object without directly contacting the temperature-sensitive part to the object under test, and senses temperature by a constant relationship between the detected temperature and the radiation energy. When the object to be measured and the object to be detected which move in such a manner are shown, temperature measurement is possible. However, such non-contact temperature measurement is not possible when there is a fume, water vapor, cooling water, etc. between the measurement object and the detection element, or when the measurement object is not seen from the thermometer installation position, or the measurement temperature has a large error. There was a problem with.

The present invention is to solve such a conventional problem, the purpose of the non-contact type using ultrasonic waves that can effectively measure the temperature of the measurement object using ultrasonic waves when the surrounding environment is contaminated or the measurement object is not seen properly The present invention provides a temperature measuring device.

1 is a block diagram showing the overall configuration for measuring the temperature in a non-contact by the present invention;

2 is a view showing a connector that is a main part of the present invention; to be.

※ Explanation of symbols about main part of drawing ※

1: measuring object 2: connector

2a: reflector 2b: adhesive

4: calculator 4a: time calculator

4b: speed calculator 4c: temperature converter

As a technical configuration for achieving the above object, the present invention is a hollow connection tube provided with an adhesive portion in close contact with the surface of the measurement object on one side and a reflection plate is installed in a predetermined position therein; An ultrasonic sensor installed on the other side of the connecting pipe; And a time calculating part connected to the ultrasonic sensor to calculate a time when the ultrasonic wave transmitted from the ultrasonic sensor is reflected by the reflector and the reflection time obtained from the time calculating part. By providing a non-contact temperature measuring device using an ultrasonic wave consisting of a speed calculation unit for calculating a, and a calculation unit consisting of a temperature conversion unit for obtaining the air temperature in the connecting tube from the ultrasonic speed obtained therefrom.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a conceptual view showing a non-contact temperature measuring apparatus using ultrasonic waves according to the present invention as a whole, and is connected by a connecting tube 2 sealed between the measurement object 1 and the ultrasonic sensor 3.

The connecting pipe 2 may be formed in a straight line or curved in accordance with a path between the measuring object 1 and the ultrasonic sensor 3.

In addition, the connecting tube 2 may be formed of a metal material so as not to be deformed in an initial shape, and may be formed of a flexible tube to bend if necessary.

The reflection plate 2a is provided at a predetermined position on the inner surface of the connecting pipe 2.

In addition, an adhesive part 2b is formed at the end of the connecting object 2 on the side of the measurement object 1.

The adhesive part 2b is preferably configured such that the end portion of the connecting tube 2 may be in close contact with the surface of the measurement object 1, and when the measurement object 1 is a magnetic material, the adhesion part 2b is provided. It is preferable to form a permanent magnet, and when the measuring object 1 is a nonmagnetic material, the connecting pipe 2 may be fixed to the measuring object 1 using an adhesive.

The ultrasonic sensor 3 is connected to the calculating unit 4, and the calculating unit 4 uses a time calculating unit 4a for calculating the reflecting time of the ultrasonic wave and a reflecting time obtained from the time calculating unit 4a. (2) a speed calculating section 4b for calculating the ultrasonic speed therein, and a temperature converting section 4c for finally converting the ultrasonic speed obtained therefrom into the air temperature in the connecting pipe 2. .

Hereinafter, the operation of the present invention.

Ultrasonic properties change depending on the medium through which sound waves propagate. That is, the propagation speed and the degree of attenuation vary according to each medium, and reflection and transmission occur at the interface of different media.

These properties are used in a variety of industrial measurements, and because the properties of the ultrasound changes depending on the medium, the properties of the propagation medium can be known by measuring the state of the ultrasound.

In addition, the biggest advantage of using the ultrasonic wave for measurement and testing is that the principle of use is relatively simple and that the same sensor can measure various variables as needed.

The present invention is to use the principle of measuring the change in velocity due to the change in the physical properties of the medium according to the temperature by using the properties of these ultrasonic waves.

That is, the present invention is to measure the temperature in a non-contact manner by using the properties of the ultrasonic wave, when the temperature of the measuring object is raised in close contact with the measuring object (1) inside the connecting pipe (2) connected to the ultrasonic sensor (3) The air temperature is also raised by heat transfer.

In addition, a reflection plate 2a for detecting the propagation speed of ultrasonic waves is provided in the connection pipe 2, and the reflection plate 2a is made of a metal material having a high density and hardness, and the determination of the installation position is used. It is determined by the following formula (1) by the radius and the center frequency of the ultrasonic sensor (3).

[Equation 1]

Where d is the distance from the ultrasonic sensor to the reflector (m)

α: radius of ultrasonic sensor (m)

λ: wavelength of the center frequency of the ultrasonic sensor used (m)

Ultrasonic waves transmitted from the ultrasonic sensor 3 are propagated into the connecting pipe 2 and are reflected by the reflecting plate 2a to be continuously received by the ultrasonic sensor 3 again. At this time, the sound wave transmitted from the ultrasonic sensor 3 is reflected by the reflecting plate 2a and the time received by the ultrasonic sensor 3 again is the time calculating unit 4a of the calculating unit 4 connected to the ultrasonic sensor 3. In the speed calculating section 4b, the current connector (2) is obtained by using the distance from the ultrasonic sensor 3 to the reflecting plate 2a and the reflecting time obtained in the time calculating section 4a. 2) The ultrasonic wave propagation speed at the air temperature in 2) is calculated.

[Equation 2]

Where υ: propagation velocity of ultrasonic waves (m / s)

l: Distance from the ultrasonic sensor to the reflector (m)

τ: ultrasonic waves transmitted from the ultrasonic sensor

Time to Reflect and Return (sec)

In addition, the speed of the ultrasonic waves obtained by the speed calculating section 4b changes the propagation speed of the ultrasonic waves if the temperature of the air inside the connection pipe 2 changes due to the nature of the ultrasonic waves. Calculate the current temperature in reverse by the following equation (3).

[Equation 3]

Where υ: propagation velocity of ultrasonic waves (m / s)

t: Air temperature in the pipe (℃)

That is, the ultrasonic propagation speed in the connecting pipe 2 can be obtained by Equation 2, and the air temperature in the current connecting pipe 2 can be obtained by using this speed.

In addition, the method of installing the connecting pipe 2 of the present invention, when there is no disturbance factors such as fume, steam, etc. in the installation place, that is, the installation pipe 2 is installed when the equipment is not operating, By fixing the end of the connecting pipe 2 to be in close contact with the surface of the measurement object 1, even when the equipment is operated, the fume, water vapor or the like does not flow into the inside of the connecting pipe 2.

Therefore, the surface temperature of the measuring object 1 can be measured accurately and simply by measuring and calculating only the temperature change inside the connecting pipe 2 by the above method.

According to the non-contact temperature measuring apparatus using ultrasonic waves according to the present invention as described above, by connecting between the measurement object and the ultrasonic sensor by a sealed connection tube, it is possible to accurately measure the temperature of the measurement object regardless of disturbance factors such as fume and water vapor. Has the effect that can be achieved.

Claims (2)

A hollow connecting tube 2 provided with an adhesive part 2b in close contact with the surface of the measurement object 1 on one side and a reflecting plate 2a installed at a predetermined position therein; Ultrasonic sensor (3) installed on the other side of the connecting pipe (2); And, A time calculation unit 4a for calculating a time when the ultrasonic wave transmitted from the ultrasonic sensor 3 is reflected by the reflecting plate 2a and returned to the ultrasonic sensor 3, and obtained by the time calculating unit 4a. A speed calculating section 4b for calculating the ultrasonic speed in the connecting pipe 2 using the reflection time, and a temperature converting part for obtaining an air temperature in the connecting pipe 2 from the ultrasonic speed obtained therefrom ( Non-contact temperature measuring device using the ultrasonic wave consisting of the calculating unit (4) of 4c). The non-contact temperature measuring device using ultrasonic waves according to claim 1, wherein the distance d between the reflecting plate (2a) and the ultrasonic sensor (3) is obtained by the following equation. Where d is the distance from the ultrasonic sensor to the reflector (m) α: radius of ultrasonic sensor (m) λ: wavelength of the center frequency of the ultrasonic sensor used (m)