CN212432358U - Black body calibration source for microwave radiometer and microwave radiometer - Google Patents
Black body calibration source for microwave radiometer and microwave radiometer Download PDFInfo
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- CN212432358U CN212432358U CN202022764267.1U CN202022764267U CN212432358U CN 212432358 U CN212432358 U CN 212432358U CN 202022764267 U CN202022764267 U CN 202022764267U CN 212432358 U CN212432358 U CN 212432358U
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Abstract
The utility model belongs to the technical field of meteorological detection, a black body calibration source and microwave radiometer for microwave radiometer is disclosed, black body calibration source includes heat preservation casing, absorbing material and vortex fan. Be equipped with the shell chamber in the heat preservation casing, a plurality of wave-absorbing material units that wave-absorbing material installed in the shell chamber and set up including bottom plate and the top surface that covers the bottom plate, the vortex fan sets up in the shell chamber, and is used for forming the circulation air current that does benefit to each and inhale the even temperature of wave-absorbing material unit between a plurality of wave-absorbing material units. The microwave radiation meter comprises a microwave radiation meter body, a heat insulation shell, a vortex fan, a microwave radiation meter, a heat insulation shell, a microwave radiation meter and a control panel, wherein the vortex fan accelerates the flow of air flow between the wave absorption material units, so that the heat distribution between the wave absorption material units is more uniform, the temperature difference between the wave absorption material units is reduced, the temperature distribution of the wave absorption material units is uniform, further, the temperature of the wave absorption material units is stable under the action of the heat insulation shell, the temperature error generated when the microwave radiation meter is calibrated can be reduced, and the detection precision is.
Description
Technical Field
The utility model relates to a meteorological detection technical field specifically, relates to a black body calibration source and microwave radiometer for microwave radiometer.
Background
The microwave radiometer is a high-sensitivity receiving device which can judge temperature and humidity curves by passively receiving microwave signals of temperature radiation transmitted from various heights and can quantitatively measure low-level microwave radiation of a target. A blackbody calibration source is arranged in the microwave radiometer, and a wave-absorbing material is arranged in the blackbody calibration source to absorb microwave signals of the antenna. Before the microwave radiometer is used for detection, the microwave radiometer needs to be calibrated by a black body to determine the static characteristic index of the measuring system, eliminate the system error and improve the accuracy of the microwave radiometer. However, the temperature of different areas inside the blackbody calibration source is different, so that the temperature distribution of the wave-absorbing material is uneven, and a large amount of temperature errors are introduced during blackbody calibration, so that the detection accuracy is influenced.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect or not enough of prior art, the utility model provides a black body calibration source and microwave radiometer for microwave radiometer can make the absorbing material unit temperature of different regions even to the temperature error is introduced in the reduction, improves and surveys the precision.
In order to achieve the above object, the present invention provides in a first aspect a blackbody calibration source for a microwave radiometer, including:
the heat preservation shell is internally provided with a shell cavity;
the wave-absorbing component is arranged in the shell cavity and comprises a bottom plate part and a plurality of wave-absorbing material units covering the top surface of the bottom plate part; and
and the turbulent flow fan is arranged in the shell cavity and is used for forming circulating airflow which is favorable for the uniform temperature of each wave absorbing material unit among the wave absorbing material units.
Optionally, the blackbody calibration source further includes a fixed support plate horizontally arranged in the housing cavity, the wave-absorbing member is mounted on the fixed support plate through a bottom plate, and a turbulent flow region is formed between the fixed support plate and the top wall of the heat-insulating housing.
Optionally, the fixed support plate is a rectangular plate, and the spoiler fans are multiple and sequentially arranged at intervals at the edge portion of the fixed support plate.
Optionally, the spoiler fan includes an intake fan and an exhaust fan respectively disposed on two adjacent edge portions of the fixed support plate, the intake fan is configured to blow air toward the spoiler area, and the exhaust fan is configured to discharge air flow in the spoiler area.
Optionally, the housing cavity is formed with a reserved air intake passage in a region between an air intake end of the air intake fan and an inner peripheral wall of the heat-insulating housing.
Optionally, the blackbody calibration source further comprises:
the temperature control piece is arranged on the bottom surface of the fixed supporting plate;
the temperature sensors are respectively used for detecting the real-time temperatures of the wave-absorbing material units in different areas; and
the controller can control the temperature control part to execute corresponding actions according to the real-time temperatures detected by the temperature sensors, so that the absolute value of the difference between the real-time temperatures detected by any two temperature sensors is maintained within a preset calibration temperature error range.
Optionally, the fixed supporting plate is a rectangular plate, and temperature sensors are arranged in the middle area and the four corner areas of the fixed supporting plate.
Optionally, the preset calibration temperature error range is not greater than 0.3K.
Optionally, a microwave passing window is formed in the top wall of the heat preservation shell, the wave absorbing component is located below the microwave passing window, and the top ends of the wave absorbing material units all point to the microwave passing window.
The utility model discloses the second aspect provides a microwave radiometer, microwave radiometer includes foretell black body calibration source that is used for microwave radiometer.
Through the technical scheme, the turbulent flow fan accelerates the air flow between each wave-absorbing material unit to make the heat distribution between the wave-absorbing material units more even, reduce the temperature difference between each wave-absorbing material unit, make each wave-absorbing material unit temperature distribution even, and further, make each wave-absorbing material unit temperature stability under the effect of the heat preservation casing, therefore can reduce the temperature error that the microwave radiometer produced when carrying out the black body calibration, improve and detect the precision.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is one of cross-sectional views of a blackbody calibration source for a microwave radiometer according to an embodiment provided by the present invention;
fig. 2 is a second cross-sectional view of a blackbody calibration source for a microwave radiometer according to the present invention;
fig. 3 is a perspective view of a blackbody calibration source for a microwave radiometer according to an embodiment of the present invention.
Description of reference numerals:
1. a heat-insulating shell; 2. a wave absorbing member; 3. a turbulent fan; 4. fixing the support plate; 5. a temperature control member; 6. A temperature sensor; 11. a shell cavity; 12. a turbulent flow area; 13. reserving an air inlet channel; 14. microwave passes through the window; 21. a bottom plate portion; 22. a wave-absorbing material unit; 31. an air intake fan; 32. an exhaust fan.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, bottom" and "upper" are generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, vertical or gravitational direction.
The invention will be described in detail below with reference to the accompanying drawings in conjunction with exemplary embodiments.
As shown in fig. 1 and 2, the utility model provides a black body calibration source for microwave radiometer, it includes heat preservation casing 1, inhale ripples part 2 and vortex fan 3. A shell cavity 11 is arranged in the heat-insulating shell 1, the heat-insulating shell 1 is made of foam plastic with good heat-insulating property, the shell cavity 11 is isolated from the external environment, and the stable internal temperature of the shell cavity 11 can be still ensured under the condition of sudden change of the external environment; the wave-absorbing component 2 is arranged in the shell cavity 11 and comprises a bottom plate part 21 and a plurality of wave-absorbing material units 22 arranged on the top surface of the bottom plate part 21, the wave-absorbing material units 22 can be fixedly connected to the top surface of the bottom plate part 21 through glue, and the wave-absorbing material units 22 are made of low-heat-capacity carbon-loaded foam and have good wave-absorbing performance; the turbulent fan 3 is arranged in the shell cavity 11 and is used for forming circulating airflow which is beneficial to the temperature uniformity of each wave absorbing material unit 22 among the wave absorbing material units 22.
Wherein, the vortex fan 3 has accelerated the air current flow between each ripples material unit 22 and has flowed to make the heat distribution between the ripples material unit 22 more even, reduce the temperature difference between each ripples material unit 22, let each ripples material unit 22 temperature distribution even, and is further, make each ripples material unit 22 temperature stabilization under the effect of the casing of keeping warm 1, can reduce the temperature error that microwave radiometer produced when carrying out the black body standard, improve and detect the precision.
As shown in fig. 3, further, the top wall of the insulated shell 1 is formed with a microwave passing window 14, the wave-absorbing member 2 is located below the microwave passing window 14, and the top ends of the plurality of wave-absorbing material units 22 are all directed to the microwave passing window 14.
Specifically, the anti-electromagnetic leakage tape is adhered to the outer surface of the heat preservation shell 1, the microwave passing window 14 is formed in the top wall area where the anti-electromagnetic leakage tape is not adhered, and the microwave passing window 14 is made of foam plastic with the wave transmittance larger than 98%, namely, the microwave passing window 14 is the only inlet of the wave absorbing component 2 for the antenna microwave signal to enter, so that the antenna signal is fully absorbed by the wave absorbing material unit 22 and is not leaked.
Preferably, the plurality of wave-absorbing material units 22 are all in a quadrangular pyramid shape and arranged in a matrix shape. The wave-absorbing material units 22 are in a quadrangular pyramid shape, so that the wave-absorbing area can be increased, and the wave-absorbing material units 22 are arranged on the top surface of the bottom plate part 21 in a matrix shape, so that the area of the top surface of the bottom plate part 21 is fully utilized.
As shown in fig. 1 and 2, in an embodiment, the blackbody calibration source further includes a fixed support plate 4 horizontally disposed in the housing cavity 11, the wave-absorbing member 2 is mounted on the fixed support plate 4 through a bottom plate portion 21, and a turbulent flow region 12 is formed between the fixed support plate 4 and the top wall of the thermal insulation housing 1.
Specifically, the heat preservation housing 1 is provided with a mounting hole for inserting the fixing support plate 4 into the housing cavity 11, and the fixing support plate 4 is fixedly connected with the outer side wall of the heat preservation housing 1 through a screw, so that the fixing support plate 4 is horizontally arranged in the housing cavity 11. Because the fixed supporting plate 4 is horizontally arranged, the wave absorbing component 2 is horizontally arranged on the fixed supporting plate 4, and the wave absorbing component 2 is favorable for vertically receiving microwave signals emitted by the antenna.
Further, the fixed support plate 4 is a rectangular plate, and the turbulent fan 3 is a plurality of and is arranged at the edge of the fixed support plate 4 at intervals in sequence. As shown in fig. 1, an edge portion of the fixed support plate 4 is a mounting plate for mounting the disturbing fan 3. The mounting plate is provided with a plurality of air flow passing holes and is fixed by welding to form an edge portion to which the support plate 4 is fixed. The turbulent fan 3 is fixed on the edge part of the fixed supporting plate 4 through threaded connection, and airflow formed when the turbulent fan 3 works can pass through the holes and enter and exit the turbulent flow area 12. The turbulent fan 3 is arranged at the edge of the fixed support plate 4 to make the circulating airflow circulate in the whole turbulent flow region 12, so that all the wave absorbing material units 22 in the turbulent flow region 12 can exchange heat with the circulating airflow.
Further, the spoiler fan 3 includes an intake fan 31 and an exhaust fan 32 respectively disposed on adjacent two edge portions of the fixed support plate 4, the intake fan 31 being provided for blowing air toward the spoiler 12, and the exhaust fan 32 being provided for discharging air flow inside the spoiler 12 to the outside. In this way, the air intake fan 31 sucks the air in the shell cavity 11 into the turbulent flow region 12, and the air exhaust fan 32 sucks the air in the turbulent flow region 12 into the shell cavity 11, so as to form circulating air flow passing through the shell cavity 11, the turbulent flow region 12 and the shell cavity 11 in sequence, so that the temperature of the shell cavity 11 is uniform, and the temperature of the wave-absorbing material unit 22 is uniform.
Further, the housing chamber 11 is formed with a reserved intake passage 13 in a region between an intake end of the intake fan 31 and an inner peripheral wall of the heat-insulating housing 1. As shown in fig. 1, in the present embodiment, the air inlet end of the air inlet fan 31 is in the reserved air inlet channel 13, so as to conveniently suck the air in the shell cavity 11 into the turbulent flow region 12; the air outlet end of the exhaust fan 32 is arranged close to the inner peripheral wall of the heat preservation shell 1, so that the air exhaust speed is slower than the air inlet speed, the air in the turbulent flow area 12 has enough time to contact with the wave-absorbing material units 22, sufficient heat exchange is carried out, and the uniform temperature among the wave-absorbing material units 22 is ensured.
In one embodiment, the blackbody calibration source further comprises a temperature control member 5, a plurality of temperature sensors 6, and a controller. The temperature control member 5 is arranged on the bottom surface of the fixed support plate 4; the plurality of temperature sensors 6 are respectively used for detecting the real-time temperatures of the plurality of wave-absorbing material units 22 in different areas; the controller can control the temperature control member 5 to execute corresponding actions according to the real-time temperatures detected by the plurality of temperature sensors 6, so that the absolute value of the difference between the real-time temperatures detected by any two temperature sensors 6 is maintained within a preset calibration temperature error range.
Specifically, when the plurality of temperature sensors 6 detect that the real-time temperature average value of the wave-absorbing material unit 22 is lower than the preset calibration temperature, the controller controls the temperature control member 5 to perform a heating action; when the plurality of temperature sensors 6 detect that the real-time temperature average value of the wave-absorbing material unit 22 is not lower than the preset calibration temperature, the controller controls the temperature control member 5 to stop heating, and at the moment, the temperature control member 5 can play a role in heat dissipation. The controller makes the absorbing material unit 22 reach preset calibration temperature fast through controlling accuse temperature piece 5, in addition, under the effect of vortex fan 3 for the heat that accuse temperature piece 5 produced evenly spreads absorbing material unit 22 in different regions, makes the absolute value of the real-time temperature difference that two arbitrary temperature sensor 6 detected maintain in preset calibration temperature error range.
In this embodiment, the temperature control member 5 is a ceramic heating plate, and is adhered to the fixed support plate 4 by using a high temperature resistant adhesive tape, and the heat generated by heating the ceramic heating plate can be transferred to the wave-absorbing material unit 22 on the fixed support plate 4; when the ceramic heating plate stops heating, the ceramic heating plate can be used as a radiating fin with a radiating function. The temperature sensor 6 adopts a patch type temperature sensor, has small volume, is convenient to fix on the wave-absorbing material unit 22, and has high temperature measurement accuracy and high reaction speed.
It is understood that the controller may comprise any one of a single chip, a microprocessor, an application specific integrated circuit, a field programmable gate array, and a digital signal processor.
Further, the fixed supporting plate 4 is a rectangular plate, and temperature sensors 6 are arranged in the middle area and four corner areas of the fixed supporting plate 4.
Specifically, the temperature sensors 6 are fixedly mounted on the wave-absorbing material units 22 located at the four corner regions of the fixed support plate 4 and on the wave-absorbing material units 22 located at the central region of the fixed support plate 4. The temperature sensor 6 is arranged to cover all the wave-absorbing material units 22 on the whole fixed support plate 4, so that the detected calibration temperature error value is more accurate.
Further, the preset calibration temperature error range is not more than 0.3K (Kelvin). In this embodiment, the calibration temperature range for the wave absorbing material elements 22 is 268K to 318K. For example, when the preset calibration temperature is 315K, it is further ensured that the real-time temperature values monitored by all the temperature sensors 6 are within the range of 314.7K to 315.3K. Therefore, the temperature uniformity of all wave-absorbing materials can be ensured, and the temperature error during black body calibration is reduced.
The utility model also provides a microwave radiometer, this microwave radiometer include foretell black body calibration source that is used for the microwave radiometer, owing to adopt foretell black body calibration source, the microwave radiometer has all technological effects that it brought, so no longer repeated description.
The above describes in detail optional implementation manners of embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details in the above implementation manners, and in the technical concept scope of the embodiments of the present invention, it is possible to perform various simple modifications on the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that, in the above-mentioned embodiments, the various technical features described in the above-mentioned embodiments can be combined in any suitable way without contradiction, and in order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
In addition, various different implementation manners of the embodiments of the present invention can be combined arbitrarily, and as long as it does not violate the idea of the embodiments of the present invention, it should be considered as the disclosure of the embodiments of the present invention.
Claims (10)
1. A blackbody calibration source for a microwave radiometer, comprising:
the heat preservation shell (1) is internally provided with a shell cavity (11);
the wave-absorbing component (2) is arranged in the shell cavity and comprises a bottom plate part (21) and a plurality of wave-absorbing material units (22) covering the top surface of the bottom plate part (21); and
and the turbulent flow fan (3) is arranged in the shell cavity (11) and is used for forming a circulating airflow which is beneficial to the uniform temperature of the wave-absorbing material units (22) among the wave-absorbing material units (22).
2. The blackbody calibration source for a microwave radiometer according to claim 1, characterized in that it further comprises a fixed support plate (4) horizontally arranged within said housing cavity (11), said wave-absorbing member (2) being mounted on said fixed support plate (4) through said bottom plate portion (21), a turbulent flow region (12) being formed between said fixed support plate (4) and the top wall of said thermally insulating housing (1).
3. A blackbody calibration source for a microwave radiometer according to claim 2, wherein the fixed support plate (4) is a rectangular plate, and the disturbing flow fans (3) are plural and sequentially arranged at intervals at an edge portion of the fixed support plate (4).
4. A hohlraum calibration source for microwave radiometers according to claim 3, characterized in that the disturbing flow fan (3) comprises an intake fan (31) and an exhaust fan (32) arranged on two adjacent edge portions of the fixed support plate (4), respectively, the intake fan (31) being arranged for blowing air towards the disturbing flow area (12) and the exhaust fan (32) being arranged for discharging the air flow inside the disturbing flow area (12) outwards.
5. A blackbody calibration source for a microwave radiometer according to claim 4, characterized in that the housing chamber (11) is formed with a pre-established air intake channel (13) in the area between the air intake end of the air intake fan (31) and the inner peripheral wall of the insulated housing (1).
6. A blackbody calibration source for a microwave radiometer as defined by claim 2, wherein said blackbody calibration source further comprises:
the temperature control piece (5) is arranged on the bottom surface of the fixed supporting plate (4);
the temperature sensors (6) are respectively used for detecting the real-time temperatures of the wave-absorbing material units (22) in different areas; and
the controller can control the temperature control part (5) to execute corresponding actions according to the real-time temperatures detected by the temperature sensors (6), so that the absolute value of the difference between the real-time temperatures detected by any two temperature sensors (6) is maintained within a preset calibration temperature error range.
7. A blackbody calibration source for a microwave radiometer according to claim 6, characterized in that the fixed support plate (4) is a rectangular plate and the temperature sensors (6) are arranged in the middle area and four corner areas of the fixed support plate (4).
8. A blackbody calibration source for a microwave radiometer as defined in claim 6, wherein said preset calibration temperature error range is no greater than 0.3K.
9. A blackbody calibration source for a microwave radiometer according to claim 1, characterized in that the top wall of the insulated housing (1) is formed with a microwave passing window (14), the absorbing member (2) is located below the microwave passing window (14), and the top ends of the absorbing material units (22) are all directed towards the microwave passing window (14).
10. A microwave radiometer comprising the blackbody calibration source for a microwave radiometer according to any one of claims 1 through 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022764267.1U CN212432358U (en) | 2020-11-26 | 2020-11-26 | Black body calibration source for microwave radiometer and microwave radiometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022764267.1U CN212432358U (en) | 2020-11-26 | 2020-11-26 | Black body calibration source for microwave radiometer and microwave radiometer |
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| CN212432358U true CN212432358U (en) | 2021-01-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203484A (en) * | 2021-05-06 | 2021-08-03 | 北京化工大学 | Novel coating square cone type microwave radiometer calibration source unit design |
| CN113739936A (en) * | 2021-09-27 | 2021-12-03 | 山东大学 | High-emissivity microwave blackbody source with cavity and calibration test method |
-
2020
- 2020-11-26 CN CN202022764267.1U patent/CN212432358U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203484A (en) * | 2021-05-06 | 2021-08-03 | 北京化工大学 | Novel coating square cone type microwave radiometer calibration source unit design |
| CN113739936A (en) * | 2021-09-27 | 2021-12-03 | 山东大学 | High-emissivity microwave blackbody source with cavity and calibration test method |
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