Double-face source temperature difference type blackbody radiation source and radiation temperature control method thereof

Abstract

The invention relates to the technical field of infrared photoelectricity, and discloses a double-surface source temperature difference type blackbody radiation source and a radiation temperature control method thereof.The double-surface source temperature difference type blackbody radiation source comprises a first surface source blackbody, a second surface source blackbody, an environment temperature sensor and a controller; the controller can receive detection signals of the environment temperature sensor, the first temperature sensor and the second temperature sensor, calculate the actual radiation temperature of the first radiation surface and the actual radiation temperature of the second radiation surface and control starting and stopping of the first temperature control part and the second temperature control part. The radiation temperature control method comprises the steps of setting a radiation temperature and a radiation temperature difference, calculating actual radiation temperatures of the first surface source black body and the second surface source black body, and adjusting the temperatures of the first surface source black body and the second surface source black body. The influence of the environment temperature change on the radiation temperature difference is small, and the radiation temperature difference precision and stability are high.

Description

Technical Field

[0001] The present invention relates to the technical field of infrared optoelectronics, and particularly to a double-sided source temperature difference type blackbody radiation source and a radiation temperature control method thereof. Background Art

[0002] With the rapid development of infrared technology, blackbody radiation sources have important applications in the fields of remote sensing, temperature measurement, infrared radiation, etc. As a calibration device for infrared imaging devices, the temperature difference type surface source blackbody has relatively high requirements for its temperature difference accuracy and stability. In practical applications, since the blackbody radiation source is not a standard blackbody, there is a certain deviation between the set temperature of the blackbody and the radiation temperature, and the radiation temperature is affected by the environment. At the same time, the radiation temperature difference of the single-sided source temperature difference type blackbody will also be continuously adjusted with the change of the ambient temperature, resulting in poor temperature difference stability.

[0003] Therefore, there is an urgent need for a double-sided source temperature difference type blackbody radiation source and a radiation temperature control method thereof to solve the above problems. Summary of the Invention

[0004] Based on the above, the purpose of the present invention is to provide a double-sided source temperature difference type blackbody radiation source and a radiation temperature control method thereof, in which the influence of ambient temperature change on the radiation temperature difference is small, and the radiation temperature difference accuracy and stability are high.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A double-sided source temperature difference type blackbody radiation source, comprising:

[0007] A first surface source blackbody, comprising a first radiation surface, a first temperature sensor and a first temperature control member. The first temperature sensor is disposed in the first radiation surface, and the first temperature sensor is used to detect the internal temperature of the first radiation surface. The first temperature control member is used to adjust the temperature of the first radiation surface;

[0008] A second surface source blackbody, comprising a second radiation surface, a second temperature sensor and a second temperature control member. The second temperature sensor is disposed in the second radiation surface, and the second temperature sensor is used to detect the internal temperature of the second radiation surface. The second temperature control member is used to adjust the temperature of the second radiation surface;

[0009] An ambient temperature sensor, used to detect the ambient temperature;

[0010] A controller, wherein the ambient temperature sensor, the first temperature sensor, the second temperature sensor, the first temperature control component and the second temperature control component are all connected to the controller. The controller is capable of receiving the detection signals of the ambient temperature sensor, the first temperature sensor and the second temperature sensor, calculating the actual radiation temperature of the first radiation surface and the actual radiation temperature of the second radiation surface, and controlling the start and stop of the first temperature control component and the second temperature control component.

[0011] As a preferred embodiment of a double-sided source temperature difference type blackbody radiation source, the first surface source blackbody further includes a first outer shell and a first ear pack. The first radiation surface and the first temperature control component are located inside the first outer shell. A first heat dissipation opening is provided on the side of the first outer shell, and the first ear pack is spaced apart to block the first heat dissipation opening; and / or

[0012] The second surface source blackbody further includes a second outer shell and a second ear pack. The second radiation surface and the second temperature control component are located inside the second outer shell. The second heat dissipation opening is provided on the side of the second outer shell, and the second ear pack is spaced apart to block the second heat dissipation opening.

[0013] A method for controlling the radiation temperature of a double-sided source temperature difference type blackbody radiation source. Based on the above-mentioned double-sided source temperature difference type blackbody radiation source, the method for controlling the radiation temperature of the double-sided source temperature difference type blackbody radiation source includes the following steps:

[0014] Set the radiation temperature and radiation temperature difference of the first surface source blackbody and the second surface source blackbody;

[0015] The internal temperature of the first radiation surface detected by the first temperature sensor, and the ambient temperature detected by the ambient temperature sensor;

[0016] Calculate the actual radiation temperature of the first surface source blackbody according to the internal temperature of the first radiation surface and the ambient temperature;

[0017] Adjust the temperature of the first surface source blackbody according to the difference between the actual radiation temperature of the first surface source blackbody and the set temperature of the first surface source blackbody;

[0018] The internal temperature of the second radiation surface detected by the second temperature sensor;

[0019] Calculate the actual radiation temperature of the second surface source blackbody according to the internal temperature of the second radiation surface and the ambient temperature;

[0020] Adjust the temperature of the second surface source blackbody according to the actual radiation temperature of the second surface source blackbody and the radiation temperature difference.

[0021] As a preferred solution of the radiation temperature control method for a double-sided source temperature difference type blackbody radiation source, when adjusting the temperature of the first surface source blackbody, each time the temperature of the first surface source blackbody is adjusted, calculate the actual radiation temperature of the first surface source blackbody, and determine whether the actual radiation temperature of the first surface source blackbody reaches the set temperature of the first surface source blackbody. If it reaches the set temperature of the first surface source blackbody, stop adjusting. If it does not reach the set temperature of the first surface source blackbody, continue to adjust;

[0022] When adjusting the temperature of the second surface source blackbody, each time the temperature of the second surface source blackbody is adjusted, calculate the actual radiation temperature of the second surface source blackbody, and determine whether the actual radiation temperature difference between the actual radiation temperature of the second surface source blackbody and the actual radiation temperature of the first surface source blackbody reaches the set radiation temperature difference. If it reaches the set radiation temperature difference, stop adjusting. If it does not reach the set radiation temperature difference, continue to adjust.

[0023] As a preferred solution of the radiation temperature control method for a double-sided source temperature difference type blackbody radiation source, when calculating the actual radiation temperature of the first surface source blackbody, the following steps are included:

[0024] Establish a radiation temperature measurement model for the first surface source blackbody in the λ1 band;

[0025] Solve the radiation temperature measurement model:

[0026] The heat conduction heat flow Φ between the cross-section where the first temperature sensor is located and the first radiation surface 1a :

[0027]

[0028] In the formula, T 1a is the detection temperature of the first temperature sensor, T 2a is the surface temperature of the first radiation surface, d is the distance between the first temperature sensor and the surface of the first radiation surface, λ is the thermal conductivity of the first radiation surface, and A is the heat exchange area.

[0029] The heat convection heat flow and radiation heat exchange Φ between the first radiation surface and the air 2a :

[0030]

[0031] In the formula, h is the convective heat transfer coefficient between the air and the first radiation surface, T0 is the ambient temperature, ε is the surface emissivity of the blackbody radiation source, and σ is the Stefan-Boltzmann constant;

[0032] In the steady-state heat transfer state, Φ 1a = Φ 2a , we get:

[0033]

[0034] According to Wien's approximation formula, the relationship between the surface temperature of the first radiation surface and the actual radiation temperature of the first radiation surface is as follows:

[0035]

[0036] In the formula, T' a is the actual radiation temperature of the first surface source blackbody, and C2 is the second radiation constant = 1.4388e -2 m*K;

[0037] According to equations (3) and (4), the actual radiation temperature T' of the first surface source blackbody in the λ1 band is calculated a .

[0038] As a preferred solution of the radiation temperature control method of a double-surface source temperature difference type blackbody radiation source, in the λ1 to λ2 band, according to Planck's radiation law, the surface temperature T of the first radiation surface 2a and the actual radiation temperature T' of the first radiation surface a are related as follows:

[0039]

[0040] In the formula, C1 is the first radiation constant = 3.742e -16 W / cm 2 ;

[0041] According to equations (3) and (5), the actual radiation temperature T' of the first surface source blackbody in the λ1 to λ2 band is calculated a .

[0042] As a preferred solution of the radiation temperature control method of a double-surface source temperature difference type blackbody radiation source, in the full band, according to the Stefan-Boltzmann law, the surface temperature T of the first surface source blackbody 2a and the actual radiation temperature T' of the first radiation surface a are related as follows:

[0043]

[0044] According to equations (3) and (6), the actual radiation temperature T' of the first surface source blackbody in the full band is calculated a .

[0045] As a preferred solution of the radiation temperature control method of a double-surface source temperature difference type blackbody radiation source, when calculating the actual radiation temperature of the second surface source blackbody, the following steps are included:

[0046] Establish a radiation temperature measurement model for the second plane source blackbody in the λ1 band;

[0047] Solve the radiation temperature measurement model:

[0048] The heat conduction heat flux Φ between the cross-section where the second temperature sensor is located and the second radiation surface 1b :

[0049]

[0050] In the formula, T 1b is the temperature of the second temperature sensor, T 2b is the surface temperature of the second radiation surface, d is the distance between the second temperature sensor and the surface of the second radiation surface, λ is the thermal conductivity of the second radiation surface, and A is the heat transfer area;

[0051] The heat convection heat flux and radiation heat transfer Φ between the second radiation surface and the air 2b :

[0052]

[0053] In the formula, h is the convective heat transfer coefficient between the air and the second radiation surface;

[0054] Under the steady-state heat transfer condition, Φ 1b = Φ 2b , we get:

[0055]

[0056] According to Wien's approximation formula, the relationship between the surface temperature of the second radiation surface and the actual radiation temperature of the second radiation surface is:

[0057]

[0058] In the formula, T' b is the actual radiation temperature of the second plane source blackbody.

[0059] Calculate the actual radiation temperature T' of the second plane source blackbody in the λ1 band according to Equation (9) and Equation (10) b .

[0060] As a preferred solution of the radiation temperature control method for a double-plane-source temperature-difference type blackbody radiation source, in the λ1 to λ2 band, according to Planck's radiation law, the relationship between the surface temperature T 2b of the second radiation surface and the actual radiation temperature T' b of the second radiation surface is:

[0061]

[0062] The actual radiation temperature T' of the second surface source blackbody in the wavelength band from λ1 to λ2 is calculated according to Equations (9) and (11). b .

[0063] As an optimal solution of the radiation temperature control method for a two-sided source temperature difference type blackbody radiation source, in the full wavelength band, according to the Stefan-Boltzmann law, the relationship between the surface temperature T2b of the second surface source blackbody and the actual radiation temperature T' of the second radiation surface is as follows: b The relationship is:

[0064]

[0065] The actual radiation temperature T' of the second surface source blackbody in the full wavelength band is calculated according to Equations (9) and (12). b .

[0066] The beneficial effects of the present invention are as follows:

[0067] The present invention provides a two-sided source temperature difference type blackbody radiation source. The two-sided source temperature difference type blackbody radiation source collects the ambient temperature in real time through an ambient temperature sensor, the temperature of the first radiation surface through a first temperature sensor, and the temperature of the second radiation surface through a second temperature sensor and feeds them back to the controller. Then, the actual radiation temperatures of the first radiation surface and the second radiation surface are calculated. Subsequently, the start and stop of the first temperature control element and the second temperature control element are controlled, so that the difference between the radiation temperatures of the first surface source blackbody and the second surface source blackbody is always kept constant, and the actual radiation temperatures of the first surface source blackbody and the second surface source blackbody can always be stably maintained at the set radiation temperature. At the same time, the influence of ambient temperature changes on the radiation temperature difference is reduced, thereby making the two-sided source temperature difference type blackbody radiation source have better use stability and higher temperature difference accuracy, so as to be better applied in infrared radiation measurement, infrared temperature calibration and other detections.

[0068] The present invention also provides a radiation temperature control method for a two-sided source temperature difference type blackbody radiation source. This method can set the radiation temperature and radiation temperature difference of the first surface source blackbody and the second surface source blackbody according to the ambient temperature, and then correct the measured value of the radiation temperature with reference to the set value, so as to achieve the purpose of making the measured radiation temperature equal to the set temperature, reducing the pressure of manual calculation, and realizing the direct setting and high-precision, high-stability control of the radiation temperature difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0070] Figure 1 is a schematic diagram of the overall structure of the double-sided source temperature difference type blackbody radiation source provided by an embodiment of the present invention;

[0071] Figure 2 is an exploded view of the first surface source blackbody provided by an embodiment of the present invention;

[0072] Figure 3 is a flowchart of the working principle of the double-sided source temperature difference type blackbody radiation source provided by an embodiment of the present invention;

[0073] Figure 4 is a flowchart of the radiation temperature control method of the double-sided source temperature difference type blackbody radiation source provided by an embodiment of the present invention.

[0074] In the figure:

[0075] 1. First surface source blackbody; 11. First covering structure; 111. Front cover assembly; 112. Rear cover assembly; 12. First radiation surface; 13. First temperature sensor; 14. First temperature control component; 15. First heat sink; 16. First outer shell; 17. First ear package; 18. First fan;

[0076] 2. Second surface source blackbody;

[0077] 3. Ambient temperature sensor;

[0078] 4. Controller. Detailed implementation manners

[0079] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the accompanying drawings, rather than all the structures.

[0080] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0081] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0082] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left" and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more. In addition, the terms "first" and "second" are only used for descriptive distinction and have no special meaning.

[0083] Such as Figures 1 to 2As shown in the figure, this embodiment provides a double-sided source temperature difference type blackbody radiation source, including a first surface source blackbody 1, a second surface source blackbody 2, an ambient temperature sensor 3, and a controller 4. The first surface source blackbody 1 includes a first radiation surface 12, a first temperature sensor 13, and a first temperature control component 14. The first temperature sensor 13 is arranged inside the first radiation surface 12 and is used to detect the internal temperature of the first radiation surface 12. The first temperature control component 14 is used to adjust the temperature of the first radiation surface 12. The second surface source blackbody 2 includes a second radiation surface, a second temperature sensor, and a second temperature control component. The second temperature sensor is arranged inside the second radiation surface and is used to detect the internal temperature of the second radiation surface. The second temperature control component is used to adjust the temperature of the second radiation surface. The ambient temperature sensor 3 is used to detect the ambient temperature. The ambient temperature sensor 3, the first temperature sensor 13, the second temperature sensor, the first temperature control component 14, and the second temperature control component are all connected to the controller 4. The controller 4 can receive the detection signals of the ambient temperature sensor 3, the first temperature sensor 13, and the second temperature sensor, calculate the actual radiation temperature of the first radiation surface 12 and the actual radiation temperature of the second radiation surface, and can control the start and stop of the first temperature control component 14 and the second temperature control component. The present invention provides a double-sided source temperature difference type blackbody radiation source. The double-sided source temperature difference type blackbody radiation source collects the ambient temperature in real time through the ambient temperature sensor 3, collects the temperature of the first radiation surface 12 through the first temperature sensor 13, collects the temperature of the second radiation surface through the second temperature sensor and feeds it back to the controller 4. Then, it calculates the actual radiation temperature of the first radiation surface 12 and the actual radiation temperature of the second radiation surface, and then controls the start and stop of the first temperature control component 14 and the second temperature control component, so that the difference in the radiation temperatures of the first surface source blackbody 1 and the second surface source blackbody 2 is always kept constant, and the actual radiation temperatures of the first surface source blackbody 1 and the second surface source blackbody 2 can always be stabilized at the set radiation temperature. At the same time, it reduces the influence of ambient temperature changes on the radiation temperature difference, so that the double-sided source temperature difference type blackbody radiation source has better use stability and higher temperature difference accuracy, so as to be better applied in infrared radiation measurement, infrared temperature calibration and other detections.

[0084] Preferably, the first temperature sensor 13 and the second temperature sensor are respectively arranged inside the first radiation surface 12 and the second radiation surface by threading. Of course, in other embodiments, they can be fixedly arranged or arranged by inserting pins, which are specifically set according to actual needs.

[0085] More preferably, the surfaces of the first radiation surface 12 and the second radiation surface are sprayed with high-emissivity black paint, and the thickness of the paint layer is 0.1 mm to 0.3 mm after drying. The thickness can be selected as 0.1 mm, 0.2 mm, 0.3 mm, etc., which are specifically set according to actual needs.

[0086] Specifically, the first surface source black body 1 further includes a first outer shell 16 and a first earphone pad 17. The first radiation surface 12 and the first temperature control member 14 are located inside the first outer shell 16. A first heat dissipation opening is provided on the side of the first outer shell 16. The first earphone pad 17 is spaced apart to block the first heat dissipation opening. The setting of the first earphone pad 17 can reduce the influence of air convection and heat conduction and isolate the direct transmission of air.

[0087] Preferably, first heat dissipation openings are provided on both opposite sides of the first outer shell 17, and a first earphone pad 17 is provided at each first heat dissipation opening, which can reduce the crosstalk of the thermal fields between the radiation surfaces of the two surface source black bodies, and even if the radiation surfaces are very close, they will not interfere with each other.

[0088] Optionally, the first heat dissipation opening is set as a cross-shaped heat dissipation opening. Of course, in other embodiments, the first heat dissipation opening can be set as other shapes such as a grille shape or a mesh shape, which is specifically set according to actual requirements.

[0089] More specifically, the first surface source black body 1 further includes a first heat sink 15, a first fan 18 and a first covering assembly 11. The first heat sink 15 is closely attached to the first temperature control member 14. The first fan 18 is located at the rear end of the first outer shell 16. The first heat sink 15 and the first fan 18 are both used for heat dissipation treatment to enable better heat conduction of the first surface source black body 1. The first covering assembly 11 includes a front cover assembly 111 and a rear cover assembly 112, which are respectively arranged at the front and rear ends of the first surface source black body 1 to play a protective role for the first surface source black body 1.

[0090] In this embodiment, the second surface source black body 2 further includes a second outer shell and a second earphone pad. The second radiation surface and the second temperature control member are located inside the second outer shell. A second heat dissipation opening is provided on the side of the second outer shell. The second earphone pad is spaced apart to block the second heat dissipation opening. The setting of the second earphone pad can reduce the influence of air convection and heat conduction and isolate the direct transmission of air.

[0091] Preferably, second heat dissipation openings are provided on both opposite sides of the second outer shell, and a second earphone pad is provided at each second heat dissipation opening, which can reduce the crosstalk of the thermal fields between the radiation surfaces of the two surface source black bodies, and even if the radiation surfaces are very close, they will not interfere with each other.

[0092] Optionally, the second heat dissipation opening is set as a cross-shaped heat dissipation opening. Of course, in other embodiments, the second heat dissipation opening can be set as other shapes such as a grille shape or a mesh shape, which is specifically set according to actual requirements.

[0093] Furthermore, the other structures of the first surface source black body are the same as those of the second surface source black body. Therefore, they will not be elaborated one by one here.

[0094] This embodiment also provides a radiation temperature control method for a double-sided source temperature difference type blackbody radiation source. Based on the above double-sided source temperature difference type blackbody radiation source, the radiation temperature control method for the double-sided source temperature difference type blackbody radiation source includes the following steps:

[0095] S100: Set the radiation temperature and radiation temperature difference of the first surface source blackbody and the second surface source blackbody;

[0096] S200: The internal temperature of the first radiation surface detected by the first temperature sensor and the ambient temperature detected by the ambient temperature sensor;

[0097] S300: Calculate the actual radiation temperature of the first surface source blackbody according to the internal temperature of the first radiation surface and the ambient temperature.

[0098] Specifically, when calculating the actual radiation temperature of the first surface source blackbody, it includes the following steps:

[0099] S301: Establish a radiation temperature measurement model for the first surface source blackbody;

[0100] S302: Solve the radiation temperature measurement model:

[0101] The heat conduction heat flux Φ between the cross-section where the first temperature sensor is located and the first radiation surface 1a :

[0102]

[0103] In the formula, T 1a is the detection temperature of the first temperature sensor, T 2a is the surface temperature of the first radiation surface, d is the distance between the first temperature sensor and the surface of the first radiation surface, λ is the thermal conductivity of the first radiation surface, and A is the heat transfer area.

[0104] The heat convection heat flux and radiation heat transfer Φ between the first radiation surface and the air 2a :

[0105]

[0106] In the formula, h is the convective heat transfer coefficient between the air and the first radiation surface, T0 is the ambient temperature, ε is the surface emissivity of the blackbody radiation source, and σ is the Stefan-Boltzmann constant.

[0107] In the steady-state heat transfer state, Φ 1a = Φ 2a , we get:

[0108]

[0109] In the λ1 band, according to the Wien approximation formula, the relationship between the surface temperature of the first radiation surface and the actual radiation temperature of the first radiation surface is:

[0110]

[0111] Wherein, T' a is the actual radiation temperature of the first surface source blackbody, and C2 is the second radiation constant = 1.4388e -2 m*K;

[0112] According to equations (3) and (4), the actual radiation temperature T' of the first surface source blackbody in the λ1 band is calculated a .

[0113] In the λ1 to λ2 band, according to Planck's radiation law, the relationship between the surface temperature T 2a of the first radiation surface and the actual radiation temperature T' a of the first radiation surface is as follows:

[0114]

[0115] Wherein, C1 is the first radiation constant = 3.742e -16 W / cm 2 ,

[0116] According to equations (3) and (5), the actual radiation temperature T' of the first surface source blackbody in the λ1 to λ2 band is calculated a .

[0117] In the full band, according to the Stefan-Boltzmann law, the relationship between the surface temperature T 2a of the first surface source blackbody and the actual radiation temperature T' a of the first radiation surface is as follows:

[0118]

[0119] According to equations (3) and (6), the actual radiation temperature T' of the first surface source blackbody in the full band is calculated a ;

[0120] S400: Adjust the temperature of the first surface source blackbody according to the difference between the actual radiation temperature of the first surface source blackbody and the set temperature of the first surface source blackbody;

[0121] Furthermore, when adjusting the temperature of the first surface source blackbody, each time the temperature of the first surface source blackbody is adjusted, calculate the actual radiation temperature of the first surface source blackbody, and determine whether the actual radiation temperature of the first surface source blackbody reaches the set temperature of the first surface source blackbody. If it reaches the set temperature of the first surface source blackbody, stop adjusting. If it does not reach the set temperature of the first surface source blackbody, continue to adjust.

[0122] S500: The internal temperature of the second radiation surface detected by the second temperature sensor;

[0123] S600: Calculate the actual radiation temperature of the second area source blackbody based on the internal temperature of the second radiation surface and the ambient temperature;

[0124] Specifically, when calculating the actual radiation temperature of the second area source blackbody, the following steps are included:

[0125] S601: Establish a radiation temperature measurement model for the second area source blackbody;

[0126] S602: Solve the radiation temperature measurement model:

[0127] The heat conduction heat flux Φ between the cross-section where the second temperature sensor is located and the second radiation surface 1b :

[0128]

[0129] In the formula, T 1b is the temperature of the second temperature sensor, T 2b is the surface temperature of the second radiation surface, d is the distance between the second temperature sensor and the surface of the second radiation surface, λ is the thermal conductivity of the second radiation surface, and A is the heat transfer area;

[0130] The heat convection heat flux and radiation heat transfer Φ between the second radiation surface and the air 2b :

[0131]

[0132] In the formula, h is the convective heat transfer coefficient between the air and the second radiation surface;

[0133] Under the steady-state heat transfer condition, Φ 1b = Φ 2b , we get:

[0134]

[0135] In the λ1 band, according to the Wien approximation formula, the relationship between the surface temperature of the second radiation surface and the actual radiation temperature of the second radiation surface is:

[0136]

[0137] In the formula, T' b is the actual radiation temperature of the second area source blackbody;

[0138] Calculate the actual radiation temperature T' of the second area source blackbody in the λ1 band according to formula (9) and formula (10) b .

[0139] In the λ1 to λ2 band, according to the Planck radiation law, the surface temperature T of the second radiation surface2b and the actual radiation temperature T' of the second radiation surface b The relationship is as follows:

[0140]

[0141] According to Equation (9) and Equation (11), the actual radiation temperature T' of the second surface source blackbody in the wavelength band from λ1 to λ2 is calculated b .

[0142] In the full wavelength band, according to the Stefan-Boltzmann law, the surface temperature T2b of the second surface source blackbody and the actual radiation temperature T' of the second radiation surface b The relationship is as follows:

[0143]

[0144] According to Equation (9) and Equation (12), the actual radiation temperature T' of the second surface source blackbody in the full wavelength band is calculated b .

[0145] S700: Adjust the temperature of the second surface source blackbody according to the actual radiation temperature of the second surface source blackbody and the set radiation temperature difference;

[0146] Furthermore, when adjusting the temperature of the second surface source blackbody, each time the temperature of the second surface source blackbody is adjusted, calculate the actual radiation temperature of the second surface source blackbody, and determine whether the actual radiation temperature difference between the actual radiation temperature of the second surface source blackbody and the actual radiation temperature of the first surface source blackbody reaches the set radiation temperature difference. If the set radiation temperature difference is reached, stop the adjustment. If the set radiation temperature difference is not reached, continue the adjustment.

[0147] This method can set the radiation temperature and radiation temperature difference of the first surface source blackbody and the second surface source blackbody according to the ambient temperature, and then correct the measured value of the radiation temperature with reference to the set value, so as to achieve the purpose of making the measured radiation temperature equal to the set temperature, reducing the pressure of manual calculation, and realizing the direct setting of the radiation temperature difference and high-precision and high-stability control.

[0148] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A double-sided source temperature difference type blackbody radiation source, characterized in that, Comprising: A first surface source black body, including a first radiation surface, a first temperature sensor, and a first temperature control component. The first temperature sensor is disposed within the first radiation surface, and is used to detect the internal temperature of the first radiation surface. The first temperature control component is used to adjust the temperature of the first radiation surface; A second surface source black body, including a second radiation surface, a second temperature sensor, and a second temperature control component. The second temperature sensor is disposed within the second radiation surface, and is used to detect the internal temperature of the second radiation surface. The second temperature control component is used to adjust the temperature of the second radiation surface; An ambient temperature sensor, used to detect the ambient temperature; A controller. The ambient temperature sensor, the first temperature sensor, the second temperature sensor, the first temperature control component, and the second temperature control component are all connected to the controller. The controller can receive the detection signals of the ambient temperature sensor, the first temperature sensor, and the second temperature sensor, calculate the actual radiation temperature of the first radiation surface and the actual radiation temperature of the second radiation surface, and control the start and stop of the first temperature control component and the second temperature control component.

2. The double-sided source temperature difference type blackbody radiation source according to claim 1, characterized in that, The first surface source black body further includes a first outer shell and a first ear cover. The first radiation surface and the first temperature control component are located within the first outer shell. A first heat dissipation opening is provided on the side of the first outer shell, and the first ear cover is spaced apart to block the first heat dissipation opening; and / or The second surface source black body further includes a second outer shell and a second ear cover. The second radiation surface and the second temperature control component are located within the second outer shell. A second heat dissipation opening is provided on the side of the second outer shell, and the second ear cover is spaced apart to block the second heat dissipation opening.

3. A method for controlling the radiation temperature of a double-sided source temperature difference type blackbody radiation source, based on the double-sided source temperature difference type blackbody radiation source described in claim 1 or 2, characterized in that, The radiation temperature control method of the dual-surface source temperature difference type black body radiation source includes the following steps: Set the radiation temperature and radiation temperature difference of the first surface source black body and the second surface source black body; The internal temperature of the first radiation surface detected by the first temperature sensor, and the ambient temperature detected by the ambient temperature sensor; Calculate the actual radiation temperature of the first surface source black body based on the internal temperature of the first radiation surface and the ambient temperature; Adjust the temperature of the first surface source black body according to the difference between the actual radiation temperature of the first surface source black body and the set temperature of the first surface source black body; The internal temperature of the second radiation surface detected by the second temperature sensor; Calculate the actual radiation temperature of the second surface source black body based on the internal temperature of the second radiation surface and the ambient temperature; Adjust the temperature of the second surface source black body according to the actual radiation temperature of the second surface source black body and the radiation temperature difference.

4. The radiation temperature control method of the double-sided source temperature difference type blackbody radiation source according to claim 3, characterized in that, When adjusting the temperature of the first surface source black body, each time the temperature of the first surface source black body is adjusted, calculate the actual radiation temperature of the first surface source black body, and determine whether the actual radiation temperature of the first surface source black body reaches the set temperature of the first surface source black body. If it reaches the set temperature of the first surface source black body, stop adjusting. If it does not reach the set temperature of the first surface source black body, continue to adjust; When adjusting the temperature of the second planar source blackbody, each time the temperature of the second planar source blackbody is adjusted, calculate the actual radiation temperature of the second planar source blackbody, and determine whether the actual radiation temperature difference between the actual radiation temperature of the second planar source blackbody and the actual radiation temperature of the first planar source blackbody reaches the set radiation temperature difference. If the set radiation temperature difference is reached, stop the adjustment; if the set radiation temperature difference is not reached, continue the adjustment.

5. The radiation temperature control method of the double-sided source temperature difference type blackbody radiation source according to claim 4, characterized in that, When calculating the actual radiation temperature of the first planar source blackbody, the following steps are included: Establish a radiation temperature measurement model for the first planar source blackbody; Solve the radiation temperature measurement model: The heat conduction heat flux Φ between the cross-section where the first temperature sensor is located and the first radiation surface 1a : where, T 1a is the detected temperature of the first temperature sensor, T 2a is the surface temperature of the first radiation surface, d is the distance between the first temperature sensor and the surface of the first radiation surface, λ is the thermal conductivity of the first radiation surface, and A is the heat transfer area. The convective heat flux between the first radiation surface and air and the radiant heat exchange Φ 2a : In the formula, h is the convective heat transfer coefficient between the air and the first radiation surface, T0 is the ambient temperature, ε is the surface emissivity of the blackbody radiation source, and σ is the Stefan-Boltzmann constant; Under the steady-state heat transfer condition, Φ 1a = Φ 2a , we get: In the λ1 band, according to the Wien approximation formula, the relationship between the surface temperature of the first radiation surface and the actual radiation temperature of the first radiation surface is: where T' a is the actual radiation temperature of the first area source blackbody, and C2 is the second radiation constant = 1.4388e -2 m*K; According to Equation (3) and Equation (4), the actual radiation temperature T' of the first surface source blackbody at the λ1 band is calculated a .

6. The method for controlling the radiation temperature of the double-sided source temperature difference type blackbody radiation source according to claim 5, wherein, In the wavelength band from λ1 to λ2, according to Planck's radiation law, the surface temperature T of the first radiation surface 2a and the actual radiation temperature T' of the first radiation surface a are related as follows: where C1 is the first radiation constant = 3.742e -16 W / cm 2 , Calculate the actual radiation temperature T' of the first surface source blackbody in the wavelength band from λ1 to λ2 according to Equation (3) and Equation (5). a .

7. The radiation temperature control method of the double-sided source temperature difference type blackbody radiation source according to claim 5, characterized in that Over the full wavelength band, according to the Stefan-Boltzmann law, the surface temperature T of the first surface source blackbody 2a and the actual radiation temperature T' of the first radiation surface a are related as follows: According to equations (3) and (6), the actual radiation temperature T' of the first surface source blackbody is calculated over the entire wavelength band. a .

8. The radiation temperature control method of the double-sided source temperature difference type blackbody radiation source according to claim 4, characterized in that, When calculating the actual radiation temperature of the second planar source blackbody, the following steps are included: Establish a radiation temperature measurement model for the second planar source blackbody in the λ1 band; Solve the radiation temperature measurement model: The heat conduction heat flux Φ between the cross-section where the second temperature sensor is located and the second radiation surface 1b : where T 1b is the temperature of the second temperature sensor, T 2b is the surface temperature of the second radiation surface, d is the distance between the second temperature sensor and the surface of the second radiation surface, λ is the thermal conductivity of the second radiation surface, and A is the heat transfer area; The heat convection heat flux and radiation heat transfer Φ between the second radiation surface and air 2b : In the formula, h is the convective heat transfer coefficient between the air and the second radiation surface; Under the steady-state heat transfer condition, Φ 1b = Φ 2b , we get: According to the Wien approximation formula, the relationship between the surface temperature of the second radiation surface and the actual radiation temperature of the second radiation surface is: where T' b is the actual radiation temperature of the second area source blackbody. According to equations (9) and (10), the actual radiation temperature T' of the second surface source blackbody at the λ1 band is calculated b .

9. The method for controlling the radiation temperature of the double-sided source temperature difference type blackbody radiation source according to claim 8, characterized in that, In the wavelength band from λ1 to λ2, according to Planck's radiation law, the surface temperature T of the second radiation surface 2b and the actual radiation temperature T' of the second radiation surface b are related as follows: According to Equation (9) and Equation (11), the actual radiation temperature T' of the second surface source blackbody is calculated in the wavelength band from λ1 to λ2 b .

10. The radiation temperature control method of the double-sided source temperature difference type blackbody radiation source according to claim 8, characterized in that Over the full wavelength band, according to the Stefan-Boltzmann law, the relationship between the surface temperature T2b of the second surface source blackbody and the actual radiation temperature T' of the second radiation surface is as follows: b is: The actual radiation temperature T' of the second surface source blackbody is calculated according to equations (9) and (12) over the entire wavelength band b .

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