CN211086143U - Millimeter wave temperature-controllable background radiation measuring room - Google Patents
Millimeter wave temperature-controllable background radiation measuring room Download PDFInfo
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- CN211086143U CN211086143U CN201921841599.6U CN201921841599U CN211086143U CN 211086143 U CN211086143 U CN 211086143U CN 201921841599 U CN201921841599 U CN 201921841599U CN 211086143 U CN211086143 U CN 211086143U
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Abstract
The utility model discloses a millimeter wave temperature-controllable background radiation measuring chamber, which comprises a supporting heat-insulating layer, a uniform background layer, a wave-transparent heat-insulating layer, a temperature sensor, an air inlet, a gas manufacturing unit, a temperature control unit and a power supply unit; the support heat insulation layer, the uniform background layer and the wave-transparent heat insulation layer form a hemispherical three-layer structure; the supporting heat-insulating layer adopts a vacuum metal wall, the uniform background layer is fully paved with wave-absorbing materials, and the wave-transmitting heat-insulating layer adopts foam materials. The gas manufacturing unit infuses gas with preset temperature to the uniform background layer through the gas inlet, and automatically adjusts the operating power of the gas manufacturing unit according to the temperature in the cover fed back by the plurality of temperature sensors in real time, and maintains a certain specified temperature value of the temperature of the wave-absorbing material in a temperature control range. The equipment can realize uniform millimeter wave radiation in all directions of the background environment so as to realize control of environmental factors in object millimeter wave radiation measurement, and improve the measurement precision by improving the difference of bright temperature difference between an object to be measured and the environment.
Description
Technical Field
The utility model belongs to the technical field of the radiometry, more specifically relates to a controllable temperature background radiometric room of millimeter wave.
Background
In the nature, objects with physical temperature higher than absolute zero (-273.15 ℃) radiate energy outwards in a very wide spectrum range in the form of electromagnetic waves, wherein the radiation frequency band comprises electromagnetic wave full frequency bands such as microwaves (including millimeter waves), terahertz, infrared rays, visible light and the like, the millimeter waves are in the higher frequency band of the microwaves, a clearer observation scene radiation bright temperature picture can be obtained through millimeter wave radiation measurement, and due to the fact that the millimeter waves can penetrate through smoke, haze, plastics and most clothing covers to a certain extent, at the end of the last century, passive millimeter wave imaging is proposed by domestic and foreign scholars to serve as a new target detection and material detection means, and the passive millimeter wave imaging is applied to various fields such as hidden object detection of human body security inspection. Meanwhile, the millimeter wave radiance can be measured by utilizing multiple radiation measurements, the millimeter wave radiance reflects the action rules of electromagnetic parameters, surface structures, internal components and the like of a target on millimeter wave radiation, and the millimeter wave radiance is a key link for researching the radiation characteristics of the target. Therefore, obtaining physical parameters or information of various objects of observation by receiving millimeter wave radiated electromagnetic energy is an important approach for technical research.
In practical situations, a target is observed, the millimeter wave thermal radiation signal at the target not only includes the thermal radiation signal radiated by the object itself, but also includes the reflection and transmission of the ambient environmental thermal radiation signal on the surface of the target, and considering the typical case, for a ground object observation or target detection scene, the transmission term is usually 0, so that the radiation received by the millimeter wave radiometer includes the radiation of the target to be measured itself and the radiation reflected by the environment on the surface of the target without the transmission term (i.e. the "non-transparent" object). Because the measuring objects mostly have surface roughness of different degrees, in actual measurement, ambient background radiation energy reaches energy in an observation direction through sample surface scattering, and background stray radiation outside a target area enters energy of a receiver through an antenna, and the stray radiation brings non-negligible error to a radiance measuring result.
Therefore, some researchers have set up a set of experimental prototype for measuring the radiation rate of millimeter waves, which comprises a millimeter wave radiation measuring chamber with uniform background (normal temperature-100 ℃), 8mm and 3mm radiometers, a reflection reference body, a blackbody reference body (normal temperature-120 ℃), a precision rotary table, a high-precision guide rail and the like. However, the uniform background of the uniform background millimeter wave radiation measuring chamber is constructed by an outdoor atmosphere cold background, is only suitable for outdoor measurement and cannot be used indoors, and the actual measurement background environment radiation cannot be controlled to be completely uniform, so that certain errors still exist relative to the true uniform background.
Disclosure of Invention
To the defect of prior art, the utility model aims to provide a millimeter wave controllable temperature background radiometer room aims at solving the current millimeter wave radiometer who awaits measuring the target and receives the environmental impact easily, and the inhomogeneity of background environment makes measuring environment be difficult to control to the problem of the degree of accuracy of the article millimeter wave measurement that awaits measuring is influenced.
In order to achieve the purpose, the utility model provides a millimeter wave temperature-controllable background radiation measuring chamber, which comprises a supporting heat-insulating layer, a uniform background layer, a wave-transparent heat-insulating layer, a temperature sensor, an air inlet, a gas manufacturing unit, a temperature control unit and a power supply unit; the support heat insulation layer, the uniform background layer and the wave-transparent heat insulation layer form a hemispherical three-layer structure;
the supporting heat-insulating layer is the outermost layer of the hemispherical three-layer structure and is used for supporting the integral structure and insulating heat of the outer layer;
the uniform background layer is a middle layer of a hemispherical three-layer structure, and the operating power of the gas manufacturing unit is automatically adjusted to maintain the temperature of the wave-absorbing material in the layer at a certain specified temperature value within the temperature control range so as to construct a uniform temperature black body background environment required by a millimeter wave uniform temperature-controllable radiation measurement experiment;
the wave-transparent heat-insulating layer is the innermost layer of the hemispherical three-layer mechanism and is used for transmitting millimeter wave radiation of the wave-absorbing material in the uniform background layer to form semi-space uniform temperature background radiation and insulating heat of the uniform background layer;
a plurality of temperature sensors are fixed on the wave-absorbing material of the uniform background layer, feed back the temperature of each collection point of the wave-absorbing material in real time and are electrically connected with the gas manufacturing unit;
the gas inlet is nested on the supporting heat insulation layer and is connected with the gas manufacturing unit for infusing gas to the uniform background layer;
the gas manufacturing unit is connected with the temperature control unit and used for manufacturing the gas transmitted to the uniform background layer;
and the power supply unit is connected with the temperature sensor, the gas manufacturing unit and the temperature control unit and is used for providing energy power for the temperature sensor, the gas manufacturing unit and the temperature control unit.
Further, the support heat insulation layer adopts a vacuum metal wall.
Further, the background layer is uniform, and the wave-absorbing material which is uniformly distributed is fully paved.
Furthermore, the wave-transparent heat-insulating layer is made of foam materials with the thickness ranging from 20mm to 40 mm.
Further, the temperature control unit is used for controlling the operation power of the gas manufacturing unit and the temperature of the manufactured gas, so that the millimeter wave uniform cold background radiation measuring chamber can be stably kept at the preset temperature.
Through the utility model discloses above technical scheme who thinks, compare with prior art, can gain following beneficial effect:
1. the utility model provides a millimeter wave controllable temperature background radiation measurement room has constructed a hemisphere three layer construction, and outmost adoption vacuum metal wall plays and supports thermal-insulated effect, and foam material is adopted to the inlayer, and this layer can see through millimeter wave radiation and play the heat preservation effect to the intermediate level, and absorbing material is paved to the intermediate level, through gas transmission and temperature control, maintains this layer under a stable temperature of predetermineeing. By constructing the blackbody background with uniform temperature, the ambient background energy scattered by the surface of the sample and reaching the observation direction is the same as the ambient background energy outside the target area of the receiver through the stray radiation on the surface of the sample and entering the receiver through the antenna during actual radiation measurement, so that the error brought by the stray radiation to the radiance measurement result is eliminated, and the measurement accuracy is improved.
2. The utility model provides a millimeter wave controllable temperature background radiometric room is through the temperature difference that increases the sample that awaits measuring and background environment to increase sample and reference body measurement output's contrast, reduce the influence of environmental radiation to final measuring result, improve millimeter wave radiometric measurement precision. The uniform background of millimeter wave radiation measurement is not passed through outdoor big air cooling background, but is constructed by hemispherical three-layer structure, so the method is also suitable for indoor measurement.
Drawings
Fig. 1 is a schematic structural view of a millimeter wave temperature-controllable background radiation measuring chamber provided by the present invention;
reference numerals:
1. the device comprises a supporting heat-insulating layer, a uniform background layer, a wave-transparent heat-insulating layer, a temperature sensor, a gas inlet, a gas manufacturing unit, a temperature control unit, a power supply unit and a temperature control unit, wherein the supporting heat-insulating layer is 2, the uniform background layer is 3, the wave-transparent heat-insulating layer is 4, the temperature sensor is.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 1 shows the utility model provides a millimeter wave controllable temperature background radiation measurement room, including supporting insulating layer 1, even background layer 2, ripples insulating layer 3 that passes through, temperature sensor 4, air inlet 5, gaseous unit 6, temperature control unit 7, the power supply unit 8 of making, support insulating layer 1, even background layer 2 and ripples insulating layer 3 constitution hemisphere three layer construction that passes through.
The support heat insulation layer 1 is the outermost layer of a hemispherical three-layer structure, a vacuum metal wall is adopted, the metal material can support the whole hemispherical structure, and meanwhile, the heat insulation effect is achieved for the uniform background layer 2.
The uniform background layer 2 is a middle layer of a hemispherical three-layer structure, a whole hemispherical wave-absorbing material is placed in the middle layer, the gas manufacturing unit 6 infuses gas into the middle layer through the gas inlet 5, the operating power of the gas manufacturing unit 6 is automatically adjusted according to the temperature in the cover fed back by the temperature sensors 4 in real time, and the temperature of the wave-absorbing material is maintained at a certain specified temperature value within the temperature control range, so that a uniform temperature black body background can be built.
The wave-transparent heat-insulating layer 3 is the outermost layer of the hemispherical three-layer mechanism and is made of foam materials, so that millimeter wave radiation of the wave-absorbing material can penetrate through the layer to form semi-space uniform temperature background radiation, the foam materials simultaneously provide a heat-insulating function for the uniform background layer 2, and the temperature of the wave-absorbing material on the uniform background layer is more stable.
The temperature sensors 4 are fixed on the wave-absorbing material of the uniform background layer 2 in a certain quantity and are electrically connected with the gas manufacturing unit 6, and the temperature of each collecting point of the wave-absorbing material in the uniform background layer 2 is fed back in real time, so that the running power of the gas manufacturing unit is automatically adjusted; the gas inlet is nested in the middle position of the hemispherical metal wall of the supporting heat insulation layer 1, is connected with the gas manufacturing unit 6 and is used for infusing gas with a certain temperature manufactured by the gas manufacturing unit 6 to the uniform background layer 2;
the gas manufacturing unit 6 is connected with the temperature control unit 7, matches corresponding operating power according to the preset temperature in the temperature control unit 7 to manufacture the gas transmitted to the uniform background layer, and automatically adjusts the operating power according to the real-time feedback temperature of the temperature sensor 4.
A temperature control unit 7 for controlling the operation power of the gas production unit 6 so that the millimeter wave uniform temperature-controllable background radiation measuring chamber can be stably maintained at a predetermined temperature;
and the power supply unit 8 is connected with the temperature sensor 4, the gas manufacturing unit 6 and the temperature control unit 7 and is used for providing energy power for the temperature sensor 4, the gas manufacturing unit 6 and the temperature control unit 7.
The utility model discloses utilize this measuring chamber can realize having even millimeter wave radiation in all directions, realize the control to measuring environment to improve the article millimeter wave radiance measurement accuracy that awaits measuring and in the human safety inspection of passive millimeter wave, reduce ambient temperature, improve the object of hiding and the difference in temperature is bright to the human body, be favorable to acquireing higher-quality radiation imaging result.
The power supply unit 8 is first started, then the temperature control unit 7 sets the preset temperature of the uniform background layer 2 in the millimeter wave uniform temperature-controllable background radiation measuring chamber, and the gas production unit 6 produces gas according to the matched operating power and transmits the gas to the uniform background layer 2 through the gas inlet 5. And then carrying out temperature debugging, and when the temperature sensors 4 reach the preset temperature and the temperature difference of each acquisition point is less than 0.5K, considering that the environment reaches a uniform environment, and starting the object millimeter wave radiance measurement experiment.
And in the test process, recording the temperature data of each acquisition point in real time, wherein in the single measurement process, the temperature difference of each acquisition point is less than 0.5K, and taking ten minutes as a node, when the temperature fluctuation of each acquisition point around the preset temperature is less than 1K, the test data is considered to be effective. If the conditions are not met, the test data are invalid, the uniform temperature-controllable background radiation measuring device of the millimeter waves is checked, experimental measurement is carried out again until the conditions are met, and effective measurement data are recorded.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A millimeter wave temperature-controllable background radiation measuring chamber is characterized by comprising a supporting heat-insulating layer, a uniform background layer, a wave-transparent heat-insulating layer, a temperature sensor, a gas inlet, a gas manufacturing unit, a temperature control unit and a power supply unit; the supporting heat-insulating layer, the uniform background layer and the wave-transparent heat-insulating layer form a hemispherical three-layer structure;
the supporting heat-insulating layer is the outermost layer of the hemispherical three-layer structure and plays roles in supporting the whole structure and insulating heat;
the uniform background layer is a middle layer of a hemispherical three-layer structure, and the operating power of the gas manufacturing unit is automatically adjusted to maintain the preset temperature value of the temperature of the wave-absorbing material in the layer within the temperature control range so as to construct a uniform temperature black body background environment required by the millimeter wave uniform temperature-controllable background radiation measurement;
the wave-transmitting heat-insulating layer is the innermost layer of the hemispherical three-layer mechanism and is used for transmitting millimeter wave radiation of the wave-absorbing material in the uniform background layer to form semi-space uniform temperature background radiation and insulating heat of the uniform background layer;
the plurality of temperature sensors are fixed on the wave-absorbing material of the uniform background layer, feed back the temperature of each collection point of the wave-absorbing material in real time and are electrically connected with the gas manufacturing unit;
the gas inlet is nested on the support heat insulation layer and is connected with a gas manufacturing unit for infusing gas to the uniform background layer;
the gas manufacturing unit is connected with the temperature control unit and used for manufacturing the gas transmitted to the uniform background layer;
and the power supply unit is connected with the temperature sensor, the gas manufacturing unit and the temperature control unit and is used for providing energy power for the temperature sensor, the gas manufacturing unit and the temperature control unit.
2. The millimeter wave temperature-controllable background radiation measurement chamber of claim 1, wherein the supporting thermal insulation layer is a vacuum metal wall.
3. The millimeter wave temperature-controllable background radiation measurement chamber of claim 1, wherein the uniform background layer comprises a uniform distribution of absorbing material.
4. The millimeter wave temperature-controllable background radiation measurement chamber of claim 1, wherein the wave-transparent and thermal-insulating layer is made of foam.
5. The millimeter wave temperature-controllable background radiation measurement chamber of claim 4, wherein the thickness of the wave-transparent and thermal-insulating layer ranges from 20mm to 40 mm.
6. The millimeter wave temperature-controllable background radiation measurement chamber according to claim 1, wherein the temperature control unit is configured to control the operating power of the gas production unit and the temperature of the produced gas, so that the millimeter wave uniform temperature-controllable background radiation measurement chamber can be stably maintained at a preset temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093298A (en) * | 2021-03-18 | 2021-07-09 | 北京航空航天大学 | Noise-like generation device suitable for passive millimeter wave security inspection imaging background illumination |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093298A (en) * | 2021-03-18 | 2021-07-09 | 北京航空航天大学 | Noise-like generation device suitable for passive millimeter wave security inspection imaging background illumination |
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