CN110864719A - Small-size environmental simulation calibration test device of microwave radiometer - Google Patents
Small-size environmental simulation calibration test device of microwave radiometer Download PDFInfo
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- CN110864719A CN110864719A CN201911112856.7A CN201911112856A CN110864719A CN 110864719 A CN110864719 A CN 110864719A CN 201911112856 A CN201911112856 A CN 201911112856A CN 110864719 A CN110864719 A CN 110864719A
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Abstract
The invention discloses a small-sized environment simulation calibration test device for a microwave radiometer, belongs to the field of radiometer instrument measurement, and aims to solve the problem of environment simulation calibration of the whole microwave radiometer and improve the measurement precision of the microwave radiometer. The test device comprises a small-sized environment temperature circulation simulation unit, a calibration source, a polyurethane door, an adjustable bracket and a lifting frame; the microwave radiometer to be calibrated is connected with the antenna and is arranged in the small-sized environment temperature circulation simulation unit, and the small-sized environment temperature circulation simulation unit provides a constant temperature environment for the microwave radiometer; the opening surface of the antenna is aligned with the input opening surface of the calibration source through a polyurethane door arranged on the side surface of the small-sized ambient temperature circulation simulation unit, and the adjustable bracket is supported below the microwave radiometer and used for adjusting the front-back position, the left-right position and the height of the microwave radiometer; the lifting frame is supported below the calibration source and used for adjusting the height of the calibration source so as to realize the alignment of the calibration source and the antenna.
Description
Technical Field
The invention belongs to the field of radiometer instrument measurement, and relates to a radiometer calibration technology.
Background
The microwave radiometer is a highly sensitive and highly stable receiver for receiving the weak microwave radiation power emitted by the ground objects. The microwave brightness temperature received by the microwave radiometer can obtain the soil temperature, humidity, salinity, snow thickness and mineralization degree of surface water under the condition of bare soil or vegetation coverage, and further draw a surface water distribution diagram and a land salinization degree distribution diagram, thereby solving the important means of the problems of flood forecasting, farmland soil moisture content forecasting, vegetation biomass forecasting, crop estimation, irrigation planning, meteorological modeling and the like.
The measurement accuracy of the microwave radiometer depends not only on the stability and sensitivity of the microwave radiometer but also on the calibration accuracy of the microwave radiometer. In particular, the calibration accuracy of microwave radiometers used for measuring the temperature and humidity profiles of the atmosphere often determines the measurement accuracy. The stability of the microwave radiometer system will be affected by ambient temperature variations due to the temperature effects of the microwave device itself. Therefore, the calibration of the microwave radiometer is performed at different environmental temperatures, or the environmental simulation calibration is performed, which not only is a necessary means for improving the measurement accuracy of the microwave radiometer, but also is an important ring for evaluating the system stability of the microwave radiometer.
Microwave radiometer calibration can be divided into two modes: step-by-step calibration method, namely, respectively completing calibration of the receiver and calibration of the antenna; and the whole calibration method is that the whole calibration from the antenna aperture surface to the output end of the receiver is carried out. However, in general, due to the limitation of calibration conditions, both calibration modes are performed at a certain fixed environmental temperature, and even if an environmental simulation test is performed, only the microwave receiver and the antenna are respectively subjected to the environmental simulation test, and the complete machine environmental simulation calibration test from the antenna aperture surface to the receiver output end cannot be realized, so that an accurate nonlinear calibration equation cannot be obtained, and the measurement accuracy of the microwave radiometer is reduced.
In order to solve the problem of environment simulation calibration of a complete machine of the microwave radiometer and improve the measurement precision of the microwave radiometer, the invention provides the small-sized test device capable of completing the environment simulation calibration of the complete machine of the microwave radiometer.
Disclosure of Invention
The invention aims to solve the problem of environment simulation calibration of a complete machine of a microwave radiometer and improve the measurement precision of the microwave radiometer, and provides a small test device capable of completing the environment simulation calibration of the complete machine of the microwave radiometer.
The invention relates to a small-sized test device for environment simulation calibration of a microwave radiometer, which comprises a small-sized environment temperature circulation simulation unit, a calibration source, a polyurethane door 9, an adjustable bracket 2 and a lifting frame 18;
the microwave radiometer 3 to be calibrated is connected with the antenna 7 and is arranged in the small-sized environment temperature circulation simulation unit, and the small-sized environment temperature circulation simulation unit provides a constant temperature environment for the microwave radiometer 3;
the opening surface of the antenna 7 is aligned with the input opening surface of the calibration source through a polyurethane door 9 arranged on the side surface of the small-sized environment temperature circulation simulation unit, and the adjustable bracket 2 is supported below the microwave radiometer 3 and used for adjusting the front-back, left-right position and height of the microwave radiometer 3;
a crane 18 is supported below the target source, the crane 18 being used to adjust the height of the target source to achieve alignment of the target source with the antenna 7.
Preferably, the antenna also comprises a wave-absorbing material 8, and the wave-absorbing material 8 is added at the edge of the polyurethane door 9, which is in contact with the antenna 7.
Preferably, the small ambient temperature cycle simulation unit employs a programmable touch-controlled high and low temperature test chamber DSCT-100 manufactured by North China center (Beijing) instruments and Equipment, Inc.
Preferably, the calibration source comprises a heat source calibration device and a cold source calibration device.
Preferably, the heat source calibration equipment adopts LTWAR500 calibration equipment which is made of black body wave-absorbing materials and is used for measuring and displaying the physical temperature in real time.
Preferably, the cold source calibration equipment comprises a glass fiber reinforced plastic fixing layer 16, a glass fiber reinforced plastic inner container 10, a polyurethane thermal insulation material 15, a polyurethane thermal insulation foam cover 13, a monocrystalline silicon wave absorbing material 14 and liquid nitrogen 11;
the glass fiber reinforced plastic fixing layer 16 and the glass fiber reinforced plastic inner container 10 are nested to form an upper opening container, a polyurethane thermal insulation material 15 is arranged in an interlayer between the glass fiber reinforced plastic fixing layer and the glass fiber reinforced plastic inner container 10, a polyurethane thermal insulation foam cover 13 is arranged at an opening of an empty container, a pressure regulating port 12 is arranged in the center of the polyurethane thermal insulation foam cover 13, a monocrystalline silicon wave absorbing material 14 is fixed on the inner side surface of the glass fiber reinforced plastic inner container 10, and the monocrystalline silicon wave absorbing material 14 is immersed in liquid nitrogen 11.
Preferably, the lifting platform pulley 19 is further included, and the lifting platform pulley 19 is arranged at the bottom of the lifting platform 18.
The invention has the beneficial effects that: the calibration device has simple structure and composition, miniaturization, small occupied area and high precision, and is suitable for the requirement of simulating the environmental temperature of the light microwave radiometer. The small-sized environment temperature circulation simulation unit is modified by adopting a programmable touch control high-low temperature test box (DSCT-100 can be selected) produced by North China department of China (Beijing) instruments and equipment Limited, and the control temperature in a working chamber can be selected to be-40-60 ℃ and the control accuracy is +/-0.5 ℃. The working chamber of the circulating device has the size of 500X 400X 500mm3And the small-volume setting mode meets the requirement of the light microwave radiometer on simulating the ambient temperature. The light microwave radiometer calibration adopts an integral two-point calibration technology. In the calibration scheme, a heat source is special LTWAR500 calibration equipment which is made of black body wave-absorbing materials and can measure and display the physical temperature of the black body wave-absorbing materials in real time, and the calibration precision is 1K; the cold source is special LTWAR200 calibration equipment for immersing the monocrystalline silicon wave-absorbing material in liquid nitrogen, and the calibration precision is 1K. In order to ensure that the antenna opening surface of the microwave radiometer in the work box can receive the radiation of the special calibration equipment accurately and losslessly through the window of the high-low temperature test box, the calibration equipment needs a special lifting frame to lift.
Drawings
FIG. 1 is a schematic structural diagram of a small-scale environmental simulation calibration test device of a microwave radiometer according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
First embodiment, the present embodiment is described below with reference to fig. 1, and the small-scale environmental simulation calibration test device for a microwave radiometer in the present embodiment includes a small-scale environmental temperature cycle simulation unit, a calibration source, a polyurethane door 9, an adjustable support 2 and a crane 18;
the microwave radiometer 3 to be calibrated is connected with the antenna 7 and is arranged in the small-sized environment temperature circulation simulation unit, and the small-sized environment temperature circulation simulation unit provides a constant temperature environment for the microwave radiometer 3;
the opening surface of the antenna 7 is aligned with the input opening surface of the calibration source through a polyurethane door 9 arranged on the side surface of the small-sized environment temperature circulation simulation unit, and the adjustable bracket 2 is supported below the microwave radiometer 3 and used for adjusting the front-back, left-right position and height of the microwave radiometer 3;
a crane 18 is supported below the target source, the crane 18 being used to adjust the height of the target source to achieve alignment of the target source with the antenna 7.
The small-sized environment temperature cycle simulation device is intended to be modified by adopting a programmable touch control high-low temperature test box (DSCT-100 is optional) produced by North China department (Beijing) instruments and equipment limited company. The working principle is as follows: in the refrigeration and heating of the refrigeration equipment 1 and the heat preservation of the heat preservation layer 5, the temperature in the working chamber 4 is automatically subjected to step temperature circulation every 10 ℃ within the range of-40 to 60 ℃, and the temperature control precision of each temperature point is +/-0.5 ℃; the microwave radiometer 3 is connected with an antenna 7 of the microwave radiometer and is fixed on the small adjustable bracket 2, and the front, back, left, right and height of the bracket are adjusted, so that the opening surface of the antenna 7 is just aligned to the input opening surface of an external calibration source through a polyurethane door 9; the polyurethane door 9 is a heat-insulating door with a polyurethane layer, can not only transmit microwaves, but also play a role in heat insulation; in order to avoid the influence of the antenna edge effect on the calibration, the wave-absorbing material 8 is added at the edge of the polyurethane door 9, which is in contact with the antenna 7. The microwave radiometer 3 is connected with the outside through a lead hole 6.
The light microwave radiometer calibration of the embodiment adopts an integral two-point calibration scheme. In the calibration scheme, a heat source adopts special LTWAR500 calibration equipment which is made of black body wave-absorbing materials and can measure and display the physical temperature in real time, the calibration precision is 1K, and a corresponding attached drawing is not given; the cold source is a calibration device for immersing the monocrystalline silicon wave-absorbing material 14 in liquid nitrogen 11, and the calibration precision is 1K as shown in figure 1. The middle of the cold source is provided with a glass fiber reinforced plastic liner 10, a monocrystalline silicon wave absorbing material 14 is fixed in the glass fiber reinforced plastic liner 10, the periphery of the glass fiber reinforced plastic liner 10 is wrapped with a polyurethane heat insulating material 15, the periphery of the polyurethane heat insulating material 15 is provided with a glass fiber reinforced plastic fixed layer 16, an upper opening of the glass fiber reinforced plastic liner 10 is covered with a polyurethane heat insulating foam cover 13, and the center of the polyurethane heat insulating foam cover 13 is provided with a pressure regulating port 12.
In addition, the calibration source is required to be aligned with the front surface of the antenna 7 under the combined action of the lifting platform 17, the lifting platform 18 and the lifting platform pulley 19, and the mouth surface of the antenna 7 of the microwave radiometer 3 in the working chamber 4 can receive the radiation of the monocrystalline silicon material 14 accurately and nondestructively through the polyurethane door 9, the heat insulation layer 15 and the liner wall of the liner 10 made of the glass fiber reinforced plastic wave-transmitting material.
The second embodiment is as follows: it is further noted that in the range of 1-15 GHz, the atmosphere appears transparent even in the presence of clouds and moderate rainfall rates. Especially for L and S wave band microwave radiometers, the microwave radiometer is not basically interfered by the atmosphere, and the atmospheric transmittance is close to 100 percent. Therefore, under the condition of clear sky, open fields such as a roof and the like can be selected, the universe background is used as a cold source, and the light microwave radiometers with the two wave bands are actually calibrated in the natural environment in four seasons of spring, summer, autumn and winter.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A small-sized environmental simulation calibration test device of a microwave radiometer is characterized by comprising a small-sized environmental temperature circulation simulation unit, a calibration source, a polyurethane door (9), an adjustable bracket (2) and a lifting frame (18);
the microwave radiometer (3) to be calibrated is connected with the antenna (7) and is arranged in the small-sized environment temperature circulation simulation unit, and the small-sized environment temperature circulation simulation unit provides a constant temperature environment for the microwave radiometer (3);
the mouth surface of the antenna (7) is aligned with the input port surface of the calibration source through a polyurethane door (9) arranged on the side surface of the small-sized environment temperature circulation simulation unit, and the adjustable bracket (2) is supported below the microwave radiometer (3) and used for adjusting the front-back, left-right positions and heights of the microwave radiometer (3);
the lifting frame (18) is supported below the calibration source, and the lifting frame (18) is used for adjusting the height of the calibration source so as to align the calibration source with the antenna (7).
2. The small-scale environment simulation calibration test device of the microwave radiometer according to claim 1, characterized in that, the device further comprises a wave-absorbing material (8), and the wave-absorbing material (8) is added at the edge of the polyurethane door (9) contacting with the antenna (7).
3. The small-scale environmental simulation calibration test device for the microwave radiometer according to claim 1, wherein the small-scale environmental temperature cycle simulation unit employs a programmable touch control high and low temperature test chamber DSCT-100 manufactured by North China department of China (Beijing) instruments and equipments Limited.
4. The small environmental simulation calibration test device for the microwave radiometer as recited in claim 1, wherein the calibration source comprises a heat source calibration device and a cold source calibration device.
5. The small environmental simulation calibration test device for the microwave radiometer as defined in claim 4, wherein the heat source calibration equipment is LTWAR500 calibration equipment made of blackbody wave absorbing material for real-time measurement and display of physical temperature thereof.
6. The small-scale environment simulation calibration test device of the microwave radiometer according to claim 4, wherein the cold source calibration equipment comprises a glass fiber reinforced plastic fixing layer (16), a glass fiber reinforced plastic liner (10), a polyurethane thermal insulation material (15), a polyurethane thermal insulation foam cover (13), a monocrystalline silicon wave-absorbing material (14) and liquid nitrogen (11);
the glass fiber reinforced plastic fixing layer (16) and the glass fiber reinforced plastic liner (10) are nested to form an upper opening container, a polyurethane thermal insulation material (15) is arranged in an interlayer between the glass fiber reinforced plastic fixing layer and the glass fiber reinforced plastic liner, a polyurethane thermal insulation foam cover (13) is arranged at an opening of the hollow device, a pressure regulating port (12) is arranged in the center of the polyurethane thermal insulation foam cover (13), a monocrystalline silicon wave absorbing material (14) is fixed on the inner side surface of the glass fiber reinforced plastic liner (10), and the monocrystalline silicon wave absorbing material (14) is immersed in liquid nitrogen (11).
7. The microwave radiometer small-scale environment simulation calibration test device according to claim 1, characterized by, further comprising a lifting table pulley (19), the lifting table pulley (19) is arranged at the bottom of the lifting frame (18).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911112856.7A CN110864719A (en) | 2019-11-14 | 2019-11-14 | Small-size environmental simulation calibration test device of microwave radiometer |
| CN202010342130.9A CN111337065A (en) | 2019-11-14 | 2020-04-27 | Small-size environmental simulation calibration test device of microwave radiometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911112856.7A CN110864719A (en) | 2019-11-14 | 2019-11-14 | Small-size environmental simulation calibration test device of microwave radiometer |
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| CN201911112856.7A Pending CN110864719A (en) | 2019-11-14 | 2019-11-14 | Small-size environmental simulation calibration test device of microwave radiometer |
| CN202010342130.9A Pending CN111337065A (en) | 2019-11-14 | 2020-04-27 | Small-size environmental simulation calibration test device of microwave radiometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739936A (en) * | 2021-09-27 | 2021-12-03 | 山东大学 | High-emissivity microwave blackbody source with cavity and calibration test method |
| 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 |
-
2019
- 2019-11-14 CN CN201911112856.7A patent/CN110864719A/en active Pending
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2020
- 2020-04-27 CN CN202010342130.9A patent/CN111337065A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739936A (en) * | 2021-09-27 | 2021-12-03 | 山东大学 | High-emissivity microwave blackbody source with cavity and calibration test method |
| 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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| CN111337065A (en) | 2020-06-26 |
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