CN102809737A - Calibration source microwave window of microwave radiometer - Google Patents
Calibration source microwave window of microwave radiometer Download PDFInfo
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- CN102809737A CN102809737A CN2012102730048A CN201210273004A CN102809737A CN 102809737 A CN102809737 A CN 102809737A CN 2012102730048 A CN2012102730048 A CN 2012102730048A CN 201210273004 A CN201210273004 A CN 201210273004A CN 102809737 A CN102809737 A CN 102809737A
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Abstract
The invention discloses a calibration source microwave window of a microwave radiometer. The calibration source microwave window comprises a tapered gradual change array (1), a tapered hollow gradual change array (2) and a fastening frame (3), wherein the tapered hollow gradual change array (2) is formed by combining 2*n subunits; the tapered gradual change array (1) is molded by integrally machining a whole piece of polystyrene; and the fastening frame (3) is molded by integrally machining polystyrene. 2*n subunits are arranged together so as to form the tapered hollow gradual change array (2); a bright temperature signal radiated from a microwave radiator firstly passes through the tapered hollow gradual change array (2) which is tightly contacted with the microwave radiator, subsequently passes through the tapered gradual change array (1), and finally reaches an outfit plane of the calibrated radiometer so as to accomplish the calibration of the radiometer. The calibration source microwave window has the characteristics of good heat insulation effect, flexible combination mode and strong generality; and moreover, the smooth transition from air characteristic impedance to polystyrene characteristic impedance is achieved; and the measurement error of reflection coefficient of the radiator is reduced effectively.
Description
Technical field
The present invention relates to a kind of reference source microwave window, particularly a kind of Calibration of Microwave Radiometer source microwave window.
Background technology
Along with China is the expansion successively of the great Space Science and Technology engineering of representative with high resolving power earth observation, lunar exploration engineering; A large amount of microwave radiometers are equipped on the satellite-based platforms such as " No. three, wind and cloud ", " No. two, ocean ", " Chang'e I ", " Chang'e-2 ", have realized that China's microwave passive remote sensing is by the leap of scientific experimentation type to the service application type.Microwave radiometer comes down to the high sensitive receiver of a kind of passive reception nature object temperature radiation.Because microwave itself has the ability that penetrates cloud layer, mist, light rain, vegetation and soil, so microwave radiometer has other frequency range remote sensing equipments, like optics, the irreplaceable detectivity of infrared remote sensing equipment.
Based on the design feature of microwave radiometer, environment of living in and application purpose, domestic and international nearly all service application type satellite-borne microwave radiometer all need can guarantee the accuracy of its remotely-sensed data through too much round calibration at present.The calibration of radiometer source is the device that radiometer is calibrated.Precision, sensitivity, the linearity and stability that it can provide standard signal to be used for the calibration radiation meter.
Most Calibration of Microwave Radiometer source of using both at home and abroad at present, all adopts subelement to be circular cone or pyramidal periodic array structure.When the Calibration of Microwave Radiometer source is operated in liquid nitrogen temperature following time, its radiation actinal surface can strong convection current take place with air also makes airborne condensation vapor on the surface of reference source radiator, causes reference source to export departing from of value.In order to make Calibration of Microwave Radiometer source operate as normal at low temperatures, the microwave window for the design of calibration of radiometer source radiator all utilizes polystyrene to make both at home and abroad.Because low-density polystyrene has good heat-insulating property; And specific inductive capacity and air ratio are more approaching; The signal of Calibration of Microwave Radiometer source radiation can pass the microwave window that polystyrene is processed smoothly, but heat-transfer paths such as conduction, convection current and infrared radiation are nearly all blocked by microwave window.
The main both at home and abroad at present microwave window manufacturing technology that adopts has two kinds.First kind of mode is that the radiator actinal surface in the calibration of radiometer source utilizes foaming technique directly to form polystyrene layer to make air can not contact with irradiator surface; The second way is on radiator, to fill some erose polystyrene with air-isolation.The shortcoming of first kind of mode has following 2 points: the one, when foaming structure need be opened because of a variety of causes, need to change whole foaming structure, and cause unnecessary waste; The 2nd, because the microwave radiation body is the violent periodic structure that rises and falls, difficult control of foaming effect and foaming result are difficult for check.The shortcoming of the second way is that filling effect is not very desirable, is difficult to the influence of cross-ventilation and conduction is suppressed to the acceptable level.In addition, the calibration of radiometer extraction slit face of two kinds of filling mode formation all is a flat shape above.Though the specific inductive capacity and the air ratio of polystyrene are more approaching, the polystyrene of planar structure is compared with radiator and also is easy to generate bigger reflection.
Summary of the invention
The object of the invention is to provide a kind of Calibration of Microwave Radiometer source microwave window, solve microwave window that traditional approach forms fill that homogeneity is not ideal enough, the problem of versatility and aspect such as dirigibility is strong and the emissivity measurement error is bigger.
A kind of Calibration of Microwave Radiometer source microwave window comprises: conical gradual change array, tapered hollow gradual change array, fastening framework.
Tapered hollow gradual change array is combined by 2 * n sub-cells.Subelement is that pyramid type or side are tapered, adopts the polystyrene of identical cubic shaped to process, and on subelement, has one to be split into half hollow structure of complementary structure with microwave radiation body conical points, and half of microwave radiation body taper wedge is placed in one.Two sub-cells are stitched together, and constitute complete complementary structure with a microwave radiation body taper wedge, and closely contact.The two sub-cells tapered hollow structure that forms that is stitched together is taper shape or Pyramid.
The conical gradual change array is by a monoblock polystyrene one machine-shaping, and outline is a rectangle.Wherein the tapered array one side is outside, and the subelement of conical gradual change array is a Pyramid.The upper surface of conical gradual change array bottom surface and tapered hollow gradual change array contacts.Fastening framework is frame structure by the machine-shaping of polystyrene one.Fastening framework closely contacts with tapered hollow gradual change array, conical gradual change array respectively.
During work, 2 * n sub-cells is emitted on together, forms tapered hollow gradual change array.Their buttons are placed on above the microwave radiation body that becomes complementary structure with it, cover microwave radiation body with 2 * n wedge.The conical gradual change array is by a monoblock polystyrene one machine-shaping.Wherein, the tapered array one side is outside, and the upper surface of conical gradual change array bottom surface and tapered hollow gradual change array contacts.Fastening framework is enclosed within tapered hollow gradual change array and conical gradual change array outside to fastening framework by the machine-shaping of polystyrene one, plays and reinforces and insulation effect.By the brightness temperature signal that the microwave radiation body gives off, the tapered hollow gradual change array through closely contacting with it through behind the conical gradual change array, arrives by the actinal surface of school radiometer then at last earlier, thereby accomplishes radiometer calbration.
The present invention adopts the tapered hollow gradual change array that can make up to realize complementary coupling with Calibration of Microwave Radiometer source radiator, has that insulation effect is good, array mode flexible, the characteristics of highly versatile.The present invention adopts the conical gradual change array as the outer actinal surface of Calibration of Microwave Radiometer source output, has realized by the air characteristics impedance can effectively reducing the measuring error of radiator reflection coefficient to the seamlessly transitting of polystyrene characteristic impedance.
Description of drawings
The synoptic diagram of a kind of Calibration of Microwave Radiometer of Fig. 1 source microwave window;
The sectional view of a kind of Calibration of Microwave Radiometer of Fig. 2 source microwave window;
A sub-cells synoptic diagram in the tapered hollow gradual change array in the microwave window of a kind of Calibration of Microwave Radiometer of Fig. 3 source.
1. conical gradual change array 2. tapered hollow gradual change arrays 3. fastening frameworks.
Embodiment
A kind of Calibration of Microwave Radiometer source microwave window comprises: conical gradual change array 1, tapered hollow gradual change array 2, fastening framework 3.
Tapered hollow gradual change array 2 is combined by 2 * n sub-cells.Subelement is that pyramid type or side are tapered, adopts the polystyrene of identical cubic shaped to process, and on subelement, has one to be split into half hollow structure of complementary structure with microwave radiation body conical points, and half of microwave radiation body taper wedge is placed in one.Two sub-cells are stitched together, and constitute complete complementary structure with a microwave radiation body taper wedge, and closely contact.The two sub-cells tapered hollow structure that forms that is stitched together is taper shape or Pyramid.
Conical gradual change array 1 is by a monoblock polystyrene one machine-shaping, and outline is a rectangle.Wherein the tapered array one side is outside, and the subelement of conical gradual change array 1 is a Pyramid.The upper surface of conical gradual change array 1 bottom surface and tapered hollow gradual change array 2 contacts.Fastening framework 3 is frame structure by the machine-shaping of polystyrene one.Fastening framework 3 closely contacts with tapered hollow gradual change array 2, conical gradual change array 1 respectively.
During work, 2 * n sub-cells is emitted on together, forms tapered hollow gradual change array 2.Their buttons are placed on above the microwave radiation body that becomes complementary structure with it, cover microwave radiation body with 2 * n wedge.Conical gradual change array 1 is by a monoblock polystyrene one machine-shaping.Wherein, the tapered array one side is outside, and the upper surface of conical gradual change array 1 bottom surface and tapered hollow gradual change array 2 contacts.Fastening framework 3 is enclosed within tapered hollow gradual change array 2 and conical gradual change array 1 outside to fastening framework 3 by the machine-shaping of polystyrene one, plays and reinforces and insulation effect.By the brightness temperature signal that the microwave radiation body gives off, the tapered hollow gradual change array 2 through closely contacting with it through behind the conical gradual change array 1, arrives by the actinal surface of school radiometer then at last earlier, thereby accomplishes radiometer calbration.
Claims (1)
1. a Calibration of Microwave Radiometer source microwave window is characterized in that comprising: conical gradual change array (1), tapered hollow gradual change array (2), fastening framework (3);
Tapered hollow gradual change array (2) is combined by 2 * n sub-cells; Subelement is that pyramid type or side are tapered, adopts the polystyrene of identical cubic shaped to process, and on subelement, has one to be split into half hollow structure of complementary structure with microwave radiation body conical points, and half of microwave radiation body taper wedge is placed in one; Two sub-cells are stitched together, and constitute complete complementary structure with a microwave radiation body taper wedge, and closely contact; The two sub-cells tapered hollow structure that forms that is stitched together is taper shape or Pyramid;
Conical gradual change array (1) is by a monoblock polystyrene one machine-shaping, and outline is a rectangle; Wherein the tapered array one side is outside, and the subelement of conical gradual change array (1) is a Pyramid; The upper surface of conical gradual change array (1) bottom surface and tapered hollow gradual change array (2) contacts; Fastening framework (3) is frame structure by the machine-shaping of polystyrene one; Fastening framework (3) closely contacts with tapered hollow gradual change array (2), conical gradual change array (1) respectively;
During work, 2 * n sub-cells is emitted on together, forms tapered hollow gradual change array (2); Their buttons are placed on above the microwave radiation body that becomes complementary structure with it, cover microwave radiation body with 2 * n wedge; Conical gradual change array (1) is by a monoblock polystyrene one machine-shaping; Wherein, the tapered array one side is outside, and the upper surface of conical gradual change array (1) bottom surface and tapered hollow gradual change array (2) contacts; Fastening framework (3) is enclosed within tapered hollow gradual change array (2) and conical gradual change array (1) outside to fastening framework (3) by the machine-shaping of polystyrene one, plays and reinforces and insulation effect; By the brightness temperature signal that the microwave radiation body gives off, the tapered hollow gradual change array (2) through closely contacting with it through behind the conical gradual change array (1), arrives by the actinal surface of school radiometer then at last earlier, thereby accomplishes radiometer calbration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102730048A CN102809737A (en) | 2012-08-02 | 2012-08-02 | Calibration source microwave window of microwave radiometer |
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| CN2012102730048A CN102809737A (en) | 2012-08-02 | 2012-08-02 | Calibration source microwave window of microwave radiometer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910714A (en) * | 2016-04-13 | 2016-08-31 | 中国计量科学研究院 | High-emissivity surface source black body radiator and manufacturing method thereof |
| 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 |
| CN114323301A (en) * | 2021-12-09 | 2022-04-12 | 兰州空间技术物理研究所 | Satellite-borne monocrystalline silicon type calibration heat source |
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| JPH08228109A (en) * | 1995-02-21 | 1996-09-03 | Mitsubishi Electric Corp | Radio wave absorbing device |
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| WO2010020816A1 (en) * | 2008-08-22 | 2010-02-25 | Absl Power Solutions Limited | Calibration load |
| CN202145229U (en) * | 2011-07-07 | 2012-02-15 | 中国航天科工集团第二研究院二〇三所 | Calibration source used for microwave radiometer |
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2012
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Patent Citations (5)
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| JPH08228109A (en) * | 1995-02-21 | 1996-09-03 | Mitsubishi Electric Corp | Radio wave absorbing device |
| CN1436041A (en) * | 2002-01-31 | 2003-08-13 | 株式会社理研 | Radio wave absorber |
| WO2010020816A1 (en) * | 2008-08-22 | 2010-02-25 | Absl Power Solutions Limited | Calibration load |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910714A (en) * | 2016-04-13 | 2016-08-31 | 中国计量科学研究院 | High-emissivity surface source black body radiator and manufacturing method thereof |
| CN105910714B (en) * | 2016-04-13 | 2018-12-18 | 中国计量科学研究院 | A kind of high emissivity area blackbody radiation source and preparation method thereof |
| 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 |
| CN114323301A (en) * | 2021-12-09 | 2022-04-12 | 兰州空间技术物理研究所 | Satellite-borne monocrystalline silicon type calibration heat source |
| CN114323301B (en) * | 2021-12-09 | 2024-03-29 | 兰州空间技术物理研究所 | Space-borne monocrystalline silicon type calibration heat source |
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Application publication date: 20121205 |