Radiation temperature measurement system and method based on multi-temperature-section measurement

Abstract

The invention provides a radiation temperature measurement system and method based on multi-temperature-section measurement, and belongs to the technical field of high-temperature material radiation temperature measurement. The technical problem to be solved is to provide a radiation temperature measurement system hardware structure based on multi-temperature-section measurement and an improvement of a temperature measurement method. According to the technical scheme, an attenuation piece switching device is installed at the front end in a protective shell, a focusing device is installed in the middle, and an industrial personal computer is installed at the rear end in the protective shell; the attenuation slice switching device comprises a switching wheel, a plurality of holes are formed in the switching wheel along a rotating shaft at equal intervals, attenuation slices with different attenuation degrees are installed in the holes, and the rotating shaft of the switching wheel is connected with an output shaft of a switching stepping motor arranged on the outer side of the protective shell; an industrial lens in the focusing device is installed at the front end of the industrial camera through threaded connection, a driven gear fixedly sleeves a focusing ring at the front end of the industrial lens, and a focusing stepping motor is installed on one side of the industrial lens. The method is applied to high-temperature material temperature measurement.

Description

Technical Field

[0001] The invention provides a radiation temperature measurement system and method based on multi-temperature section measurement, belonging to the technical field of radiation temperature measurement of high-temperature materials. Background Art

[0002] In the application of industrial production, the measurement of the surface temperature of high-temperature materials is crucial, and the setting of the temperature measurement system is very necessary. The existing temperature measurement system has many design defects in the measurement of the surface temperature of high-temperature materials. The currently used high-temperature radiation temperature measurement system mainly has the following problems: 1. The temperature measurement range is narrow and multi-temperature measurement cannot be achieved; 2. The target area cannot be accurately located during use, resulting in inaccurate measurement results; 3. It is necessary to manually adjust the instrument for temperature measurement. The temperature measurement accuracy depends on experience and judgment, and the measurement error is large; In view of the above shortcomings, it is necessary to improve the structure of the currently used radiation temperature measurement system and the corresponding temperature measurement method. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention aims to solve the technical problem of providing an improvement in the hardware structure of a radiation temperature measurement system and a temperature measurement method based on multi-temperature segment measurement.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a radiation temperature measurement system based on multi-temperature section measurement, comprising a protective shell, an attenuation plate switching device is installed at the front end position of the protective shell, a focusing device is installed at the middle position of the protective shell, and an industrial control computer is installed at the rear end position of the protective shell; The attenuation sheet switching device comprises a switching wheel, a plurality of holes are arranged at equal distances along the rotating shaft of the switching wheel, and attenuation sheets with different attenuation degrees are installed in each hole, and the rotating shaft of the switching wheel is connected to the output shaft of the switching stepping motor arranged outside the protective shell; The focusing device comprises an industrial lens, an industrial camera, a focusing stepping motor, a driving gear, and a driven gear. The industrial lens is installed on the front end of the industrial camera through a threaded connection, and the driven gear is fixedly sleeved on the focusing ring at the front end of the industrial lens. The focus stepper motor is installed on one side of the industrial lens, the driving gear is installed on the output shaft of the focus stepper motor, and the driving gear is meshed with the driven gear for transmission connection; The front end of the protective shell is provided with a window for allowing the light of the measured target image to enter, the installation position of the industrial lens coincides with the central axis of the window, and the installed switching wheel can rotate any attenuation sheet to a position between the window and the industrial lens by rotating the shaft, and the attenuation sheet rotated in place can cover the entire window; The signal output end of the industrial camera is connected to the industrial computer through a control bus, so that the industrial camera can transmit the image information of the measured target to the industrial computer; The signal output end of the industrial computer is connected to the control end of the switching stepping motor and the focusing stepping motor respectively through wires; The industrial computer is also connected to a display screen arranged outside the protective shell through a control bus.

[0005] When the attenuation plates installed on the switching wheel are rotated to the working position, the center point of any attenuation plate can coincide with the central axis of the window.

[0006] The attenuation sheets are installed at intervals along the circumference direction on the switching wheel, and the attenuation degree from the first attenuation sheet to the last attenuation sheet installed increases or decreases in sequence along the installation direction.

[0007] The specific number of attenuation sheets installed is 4, and the attenuation degree of each attenuation sheet is 20%, 40%, 60%, and 80% respectively. Each attenuation degree represents a different temperature measurement range, namely, T1, T2, T3, and T4 temperature segments, and the temperature increases successively. By controlling the exposure time of the industrial camera, the temperature measurement range under each attenuation degree is further refined, namely, Kn1, Kn2, Kn3, and Kn4 temperature segments.

[0008] The exposure time of the industrial camera is set according to the temperature of the target to be measured. Specifically, within each temperature measurement temperature range, the exposure times En1, En2, En3, and En4 are set to decrease in sequence to correspond to the corresponding refined temperature segments Kn1, Kn2, Kn3, and Kn4.

[0009] A barrier bracket plate is also vertically mounted on the outside of the industrial lens, and the focusing stepper motor is specifically mounted on the rear end of the barrier bracket plate.

[0010] The diameter of the viewing window is adapted to the diameter of an industrial lens, and the viewing window is also provided with a built-in polarizing film for eliminating reflections.

[0011] The protective shell is specifically a hollow box body, and a front cover and a rear cover are respectively installed at the front and rear ends of the protective shell by bolts; The switching stepping motor is specifically installed on the front end cover; The rear end cover is also provided with a control bus outlet.

[0012] A clamping screw connected to the output shaft of the switching stepping motor is also provided at the center of the switching wheel; The industrial camera is specifically installed at the bottom of the protective shell through a support; A heat dissipation strip is also arranged on the outer side wall of the protective shell.

[0013] The method for measuring temperature using a radiation temperature measurement system based on multi-temperature segment measurement includes the following temperature measurement steps: S1: Align the window of the temperature measurement system to the high-temperature target to be measured. First, adjust the switch wheel to switch the attenuation sheet with an attenuation degree of 20%, that is, select the temperature measurement range as T1 and the exposure time of the industrial camera as En1; S2: Control the focus stepper motor to focus the industrial camera. When the target displayed on the display is clearly focused, control the industrial camera to collect high-temperature target images with different exposure times. S3: Control the industrial computer to extract the high-temperature target image collected by the industrial camera in step S2, perform denoising on the image, and then obtain the mean of each RGB component of the target image; S4: Determine whether the target temperature is in the T1 temperature range: If the temperature of the object being measured is higher than the temperature within the temperature measurement range of T1, the attenuation sheet switching device controls the attenuation sheet with a stronger attenuation to rotate to the working position; If the target temperature of the object under test drops, the attenuation sheet switching device controls the attenuation sheet with a weaker attenuation to rotate to the working position until the target temperature under test is in a certain temperature range Tn; S5: When the target is in a certain temperature range Tn, the industrial camera is controlled to take an image of the target with an exposure time of En2, and it is determined whether the R channel component value of the image is between 40 and 215: If the R channel component is less than 40, the image of the measured target is in an undersaturated state on the display screen, and the exposure time is switched to En1; If the R channel component is greater than 215, the image of the target being measured is in an oversaturated state on the display screen, and the exposure time is switched to En3 to avoid oversaturation of the image of the target being measured; S6: Assume that there is a corresponding relationship between the component values ​​of the image pixels R, G, and B output by the industrial camera and the temperature of the measured object, and the corresponding relationship is f. Then the expression of the corresponding relationship between the component values ​​of R, G, and B and the temperature T of the measured object is: T= f (R, G, B); According to the cubic polynomial mapping relationship between the above formula R / (G·B) and the temperature T of the target to be measured, the temperature of the target to be measured is calculated by the program built into the industrial computer; S7: The industrial computer transmits the calculated target temperature data to the display screen through the control bus.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: in order to overcome the problems of the existing temperature measurement system, such as the narrow temperature measurement range, the inability to accurately locate the target area to be measured and the large error, the present invention provides a multi-temperature segment high-precision temperature measurement system and a temperature measurement method, by providing a window at the front end of the protective shell for allowing the radiation light of the target to be measured to enter, and arranging the industrial lens to coincide with the central axis of the window, any installed attenuation plate can be driven by the switching wheel to rotate to a position between the window and the industrial lens and cover the window; when in use, the industrial camera transmits the image information of the target to be measured to the industrial computer, the industrial computer controls the focus stepper motor to realize the focus of the industrial camera, and controls the switching stepper motor to switch the attenuation plate, so as to realize the temperature measurement of the target to be measured in a wider range; the present invention can realize multi-temperature segment measurement of the target to be measured, accurately locate the temperature of the target area to be measured, and effectively reduce the temperature measurement error caused by human experience judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the temperature measurement system of the present invention; Figure 2 It is a partial structural schematic diagram of the temperature measurement system of the present invention; Figure 3 It is a structural schematic diagram of the baffle bracket plate of the present invention; Figure 4 It is a structural schematic diagram of the switching wheel of the present invention; Figure 5 Schematic diagram of temperature section switching during temperature measurement in an embodiment of the present invention; Figure 6 is a flow chart of the steps of the temperature measurement method in an embodiment of the present invention; The meaning of the numbers in the figure is: 101-switching wheel; 102-switching stepping motor; 103-attenuation sheet; 201-industrial lens; 202-industrial camera; 203-focus stepper motor; 204-driving gear; 205-driven gear; 3-industrial computer; 4-protective shell; 401- window; 402- baffle bracket plate; 403- front cover; 404- rear cover; 405- control bus outlet; 5-display screen; 6-polarizer; 7-pressing screw; 8-support; 9-control bus; 10-heat sink. DETAILED DESCRIPTION

[0016] The present invention specifically provides a radiation temperature measurement system and method based on multi-temperature segment measurement, which is used for multi-temperature segment and high-precision temperature measurement of high-temperature materials; the provided temperature measurement system is provided with an attenuation plate switching device, which can realize multi-temperature segment measurement of the target to be measured, and the focusing device can be used to accurately locate the target area to be measured; the temperature of the target to be measured is calculated by an industrial computer, which can effectively reduce the error caused by human experience and judgment, and realize high-precision temperature measurement.

[0017] The present invention is provided with an attenuation sheet switching device, which specifically controls the switching stepping motor to accurately rotate the switching wheel so that the central axis of the attenuation sheet on the switching wheel is aligned with the central axis of the window, thereby completing the switching of the attenuation sheet, thereby achieving different degrees of attenuation of the radiation brightness of the target to be measured, thereby achieving a wider range of temperature measurement for the target to be measured.

[0018] The present invention is provided with a focusing device, which specifically controls the focusing stepper motor to realize the focusing operation of the industrial lens, so that the measured target is clearly imaged on the photosensitive chip of the industrial camera. After that, the industrial camera collects image data and transmits it to the industrial computer through the control bus. After processing, the measured target area can be accurately located.

[0019] Further Figures 1 to 4 As shown, in an embodiment of the present invention, a radiation temperature measurement system structure is specifically provided, which includes an attenuation sheet switching device, a focusing device, an industrial computer 3 and a protective shell 4; the attenuation sheet switching device includes a switching wheel 101, a switching stepping motor 102 and a plurality of attenuation sheets 103, and a hole for accommodating the attenuation sheet 103 is opened on the switching wheel 101. Different attenuation sheets 103 have different attenuation degrees. The switching wheel 101 is rotatably arranged on the inner side of the front end of the protective shell 4 and connected to the output shaft of the switching stepping motor 102; The focusing device includes an industrial lens 201, an industrial camera 202, a focusing stepper motor 203, a driving gear 204 and a driven gear 205; the industrial lens 201 is connected to the front end of the industrial camera 202 by a thread, the driven gear 205 is fixedly sleeved on the focusing ring of the front end of the industrial lens 201, the driving gear 204 is meshed with the driven gear 205 and driven by the focusing stepper motor 203, and the rear end of the industrial camera 202 is fixed to the rear end inner side of the protective shell 4; The front end of the protective shell 4 is provided with a window 401 for allowing the light of the measured target image to enter, the industrial lens 201 coincides with the central axis of the window 401, and any attenuation sheet 103 can be driven by the switching wheel 101 to rotate to a position between the window 401 and the industrial lens 201 and cover the window 401, and the industrial computer 3 is fixedly connected to the inner cavity of the protective shell 4; The industrial camera 202 transmits the image information of the target to be measured to the industrial computer 3. The industrial computer 3 controls the focus stepper motor 203 to achieve the focus of the industrial camera 202, and controls the switching stepper motor 102 to switch the attenuation plate 103 to achieve a wider range of temperature measurement of the target to be measured; the industrial computer 3 is connected to the industrial camera 202 and the channel control bus 9 transmits the calculated temperature information of the target to be measured to the display screen 5.

[0020] In this embodiment, the center of the virtual circle where the center points of all the attenuation sheets 103 are located coincides with the center point of the switching wheel 101, and the center point of any attenuation sheet 103 can be rotated to a position that coincides with the central axis of the window 401. The attenuation sheets 103 are arranged at intervals along the circumference direction on the switching wheel 101, and the attenuation degree from the first attenuation sheet 103 to the last attenuation sheet 103 increases or decreases along the arrangement direction. The number of attenuation sheets 103 is 4, and the attenuation degrees are 20%, 40%, 60% and 80% respectively. Since the higher the temperature of the target to be measured, the higher its radiation brightness, the attenuation sheets with different attenuation ratios on the switching wheel can be used to attenuate the radiation brightness of the target to be measured to different degrees, and then an industrial camera is used to collect images of the target, and the images are solved by the internal algorithm of the industrial computer 3, thereby realizing multi-temperature section measurement of the target to be measured.

[0021] A barrier bracket plate 402 is fixedly connected in the inner cavity of the protective shell 4, the focus stepper motor 203 is fixedly connected to the upper rear side of the barrier bracket plate 402, and the driving gear 204 is fixedly connected to the output shaft of the focus stepper motor 203 by a tightening screw and meshes with the driven gear 205 below; the lower part of the barrier bracket plate 402 has an avoidance channel that can avoid the industrial lens 201.

[0022] The diameter of the window 401 of the protective shell 4 is equal to the diameter of the industrial lens 201, and the window 401 is built with a polarizer 6 for eliminating reflections, thereby improving the accuracy of temperature measurement. The protective shell 4 is a hollow box, and the front and rear ends of the protective shell 4 are respectively provided with a front cover 403 and a rear cover 404 connected with the box bolts, and heat dissipation strips 10 are provided on both sides of the protective shell 4, which can effectively reduce the temperature inside the temperature measurement system, so that the temperature measurement system can operate safely and stably; a clamping screw 7 connected with the output shaft of the switching stepper motor 102 is provided at the center of the switching wheel 101, and the switching stepper motor 102 is fixed to the upper part of the front cover 403; the industrial camera 202 is fixed to the bottom of the protective shell 4 by a support 8 bolt, and the industrial computer 3 is fixed to the top of the rear end of the protective shell 4 by screws, and a control bus outlet 405 is provided on the rear cover 404, which is convenient for the extraction of the internal control bus of the temperature measurement system, and realizes the transmission of data and the display of temperature data.

[0023] Further Figure 5 and Figure 6As shown, in an embodiment of the present invention, a multi-temperature section high-precision temperature measurement method is further proposed, which includes the following temperature measurement steps: Aim the window 401 of the temperature measurement system at the high temperature target to be measured, first adjust the switch wheel 101 to switch the attenuation sheet 103 with an attenuation degree of 20%, that is, the temperature measurement range is selected as T1, and the exposure time of the industrial camera 202 is selected as E11; The focusing operation of the industrial camera 202 is realized by controlling the focusing stepper motor 203. When the measured target on the display screen 5 is in clear focus, the industrial camera 202 is used to collect the high-temperature target image with different exposure times; The industrial computer 3 is used to extract the high-temperature target captured by the industrial camera 202, and after denoising the image, the mean value of each RGB component of the target image is obtained; Determine whether the temperature of the measured object is in the T1 temperature range. If the temperature of the measured object is higher than the temperature in the T1 temperature measurement range, control the attenuation plate switching device to switch the attenuation plate 103 with a stronger attenuation degree. If the temperature of the measured object drops, control the attenuation plate switching device to switch the attenuation plate 103 with a weaker attenuation degree until the temperature of the measured object is in a certain temperature range Tn. When in a certain temperature range Tn, the image of the target to be measured is photographed with an exposure time of En2, and it is determined whether the R channel component value of the image is between 40 and 2.15. If the R channel component is less than 40, it indicates that the image of the target to be measured is in an undersaturated state on the display screen 5, and the target image information is less, and the exposure time needs to be switched to En1. If the R channel component is greater than 2.15, it indicates that the image of the target to be measured is in an oversaturated state on the display screen 5, and the exposure time needs to be switched to En3 to avoid oversaturation of the target image to be measured. According to the cubic polynomial mapping relationship between the R / (G·B) formula and the temperature T of the measured target, the industrial computer 3 is used to solve the temperature of the measured target, and finally the industrial computer 3 transmits the measured temperature value to the display screen 5 for display via the RS485 control line.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radiation temperature measurement system based on multi-temperature range measurement, comprising a protective shell (4), characterized in that: An attenuation plate switching device is installed at the front end position of the protective shell (4), a focusing device is installed at the middle position of the protective shell (4), and an industrial control computer (3) is installed at the rear end position of the protective shell (4); The attenuation sheet switching device comprises a switching wheel (101), a plurality of holes are arranged at equal intervals along the rotation axis of the switching wheel (101), and attenuation sheets (103) with different attenuation degrees are installed in each hole, and the rotation axis of the switching wheel (101) is connected to the output shaft of a switching stepping motor (102) arranged outside the protective shell (4); The focusing device comprises an industrial lens (201), an industrial camera (202), a focusing stepping motor (203), a driving gear (204), and a driven gear (205); the industrial lens (201) is mounted on the front end of the industrial camera (202) via a threaded connection, and the driven gear (205) is fixedly sleeved on the focusing ring at the front end of the industrial lens (201); The focus stepping motor (203) is mounted on one side of the industrial lens (201), the driving gear (204) is mounted on the output shaft of the focus stepping motor (203), and the driving gear (204) is meshed with the driven gear (205) to form a transmission connection; The front end of the protective shell (4) is provided with a window (401) capable of allowing light from the image of the target to be measured to enter; the installation position of the industrial lens (201) coincides with the central axis of the window (401); the installed switching wheel (101) can rotate any attenuation sheet (103) to a position between the window (401) and the industrial lens (201) through the rotation of the shaft; the attenuation sheet (103) rotated into position can cover the entire window (401); The signal output end of the industrial camera (202) is connected to the industrial computer (3) via a control bus (9), so that the industrial camera (202) can transmit image information of the target to be measured to the industrial computer (3); The signal output end of the industrial control computer (3) is respectively connected to the control ends of the switching stepping motor (102) and the focusing stepping motor (203) through wires; The industrial control computer (3) is also connected to a display screen (5) arranged outside the protective shell (4) via a control bus (9).

2. A radiation temperature measurement system based on multi-temperature range measurement according to claim 1, characterized in that: When each attenuation sheet (103) mounted on the switching wheel (101) is rotated to a working position, the center point of any attenuation sheet (103) can coincide with the center axis of the viewing window (401).

3. A radiation temperature measurement system based on multi-temperature section measurement according to claim 2, characterized in that: The attenuation sheets (103) are installed at intervals along the circumferential direction on the switching wheel (101), and the attenuation degree of the attenuation sheet (103) installed from the first attenuation sheet (103) to the last attenuation sheet (103) increases or decreases in sequence along the installation direction.

4. The radiation temperature measurement system based on multi-temperature section measurement according to claim 3 is characterized in that: The number of attenuation sheets (103) installed is specifically 4, and the attenuation degree of each attenuation sheet (103) is 20%, 40%, 60%, and 80% respectively. Each attenuation degree represents a different temperature measurement range, namely, T1, T2, T3, and T4 temperature segments, and the temperature increases successively. By controlling the exposure time of the industrial camera (202), the temperature measurement range under each attenuation degree is further refined, namely, Kn1, Kn2, Kn3, and Kn4 temperature segments.

5. The radiation temperature measurement system based on multi-temperature section measurement according to claim 4 is characterized in that: The exposure time of the industrial camera (202) is set according to the temperature of the measured object. Specifically, within each temperature measurement temperature range, the exposure times En1, En2, En3, and En4 are set to decrease in sequence to correspond to the corresponding refined temperature sections Kn1, Kn2, Kn3, and Kn4.

6. The radiation temperature measurement system based on multi-temperature section measurement according to claim 1 is characterized in that: A barrier support plate (402) is also vertically mounted on the outside of the industrial lens (201), and the focus stepping motor (203) is specifically mounted on the rear end of the barrier support plate (402).

7. The radiation temperature measurement system based on multi-temperature range measurement according to claim 1 is characterized in that: The diameter of the viewing window (401) is compatible with the diameter of the industrial lens (201), and the viewing window (401) is also equipped with a built-in polarizing film (6) for eliminating reflections.

8. The radiation temperature measurement system based on multi-temperature section measurement according to claim 1 is characterized in that: The protective shell (4) is specifically a hollow box body, and a front cover (403) and a rear cover (404) are respectively installed at the front and rear ends of the protective shell (4) by bolts; The switching stepping motor (102) is specifically mounted on the front end cover (403); The rear end cover (404) is also provided with a control bus outlet (405).

9. The radiation temperature measurement system based on multi-temperature range measurement according to claim 1, characterized in that: A clamping screw (7) connected to the output shaft of the switching stepping motor (102) is also provided at the center of the switching wheel (101); The industrial camera (202) is specifically installed on the bottom of the protective shell (4) via a support (8); A heat dissipation strip (10) is also provided on the outer side wall of the protective shell (4).

10. A method for measuring temperature using a radiation temperature measurement system based on multi-temperature section measurement as claimed in claim 5, characterized in that: The temperature measurement steps include the following: S1: Aim the window (401) of the temperature measurement system at the high temperature target to be measured, first adjust the switching wheel (101) to switch the attenuation plate (103) with an attenuation degree of 20%, that is, select the temperature measurement range as T1, and select the exposure time of the industrial camera (202) as En1; S2: controlling the focus stepping motor (203) to perform a focus operation on the industrial camera (202), and when the measured target displayed on the display screen (5) is in clear focus, controlling the industrial camera (202) to capture images of the high-temperature target with different exposure times; S3: Control the industrial computer (3) to extract the high-temperature target image captured by the industrial camera in step S2, perform denoising on the image, and then calculate the mean of each RGB component of the target image; S4: Determine whether the target temperature is in the T1 temperature range: If the temperature of the object being measured is higher than the temperature within the temperature measurement range T1, the attenuation sheet switching device controls the attenuation sheet (103) with a stronger attenuation degree to rotate to the working position; If the target temperature of the object being measured drops, the attenuation sheet switching device controls the attenuation sheet (103) with a weaker attenuation to rotate to a working position until the target temperature being measured is in a certain temperature range Tn; S5: When the target is in a certain temperature range Tn, the industrial camera (202) is controlled to capture an image of the target with an exposure time of En2, and it is determined whether the R channel component value of the image is between 40 and 215: If the R channel component is less than 40, the image of the target being measured is in an undersaturated state on the display screen (5), and the exposure time is switched to En1; If the R channel component is greater than 215, the image of the target being measured is in an oversaturated state on the display screen (5), and the exposure time is switched to En3 to avoid oversaturation of the image of the target being measured; S6: Assume that there is a corresponding relationship between the component values ​​of the image pixels R, G, and B output by the industrial camera (202) and the temperature of the object to be measured, and the corresponding relationship is f. Then, the expression for the corresponding relationship between the component values ​​of R, G, and B and the temperature T of the object to be measured is: T= f (R,G,B); According to the cubic polynomial mapping relationship between the above formula R / (G·B) and the temperature T of the target to be measured, the temperature of the target to be measured is calculated by the program built into the industrial computer (3); S7: The industrial computer (3) transmits the calculated target temperature data to the display screen (5) via the control bus for display.

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