CN111965435A - High-speed plasma sheath spectrum modulation characteristic measuring device - Google Patents
High-speed plasma sheath spectrum modulation characteristic measuring device Download PDFInfo
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- CN111965435A CN111965435A CN202010828781.9A CN202010828781A CN111965435A CN 111965435 A CN111965435 A CN 111965435A CN 202010828781 A CN202010828781 A CN 202010828781A CN 111965435 A CN111965435 A CN 111965435A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
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Abstract
The invention relates to a high-speed plasma sheath spectrum modulation characteristic measuring device which comprises a wave-transparent model, a transmitting antenna and a receiving antenna, wherein the transmitting antenna is arranged in the wave-transparent model, the receiving antenna is arranged outside the wave-transparent model and is positioned right below the transmitting antenna, the wave-transparent model is positioned inside high-enthalpy airflow, the head of the wave-transparent model faces to the flow direction of the high-enthalpy airflow, and the receiving antenna is arranged outside the high-enthalpy airflow.
Description
Technical Field
The invention relates to the technical field of electromagnetic measurement equipment, in particular to a device for measuring the spectral modulation characteristic of a high-speed plasma sheath.
Background
When a high-speed target moves at a high speed in the atmosphere, a plasma sheath is generated around the target, and interference is generated on radar waves. The constant generation and recombination of electrons within the plasma sheath has a spectral modulation characteristic effect on the reflected signal, and therefore a measurement of the spectral modulation characteristic of the plasma sheath is required.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is to solve the problem of how to measure the spectral modulation characteristic of a plasma sheath.
(II) technical scheme
In order to solve the technical problem, the invention provides a high-speed plasma sheath spectrum modulation characteristic measuring device which comprises a wave-transparent model, a transmitting antenna and a receiving antenna, wherein the transmitting antenna is arranged in the wave-transparent model, the receiving antenna is arranged outside the wave-transparent model and is positioned right below the transmitting antenna, the wave-transparent model is positioned inside high-enthalpy airflow, the head of the wave-transparent model faces to the flow direction of the high-enthalpy airflow, and the receiving antenna is arranged outside the high-enthalpy airflow.
As a further explanation of the present invention, it is preferable that the wave-transparent model head is a hemispherical cambered surface.
As a further illustration of the present invention, it is preferred that the wave-transparent model outer diameter is smaller than the cross-sectional outer diameter of the high enthalpy gas flow.
As a further description of the present invention, preferably, the transmitting end surface of the transmitting antenna is parallel to the bottom plane of the wave-transparent model, and the receiving end surface of the receiving antenna is opposite to the transmitting end surface of the transmitting antenna.
As a further description of the present invention, preferably, the tail of the wave-transparent model is fixedly connected to a hollow model hard support, a transmitting end signal line is inserted into the model hard support, and the transmitting end signal line is connected to the transmitting antenna.
As a further description of the present invention, preferably, one side of the receiving antenna is fixedly connected with a hollow model support, one end of the receiving antenna is connected with a receiving end signal line, and the receiving end signal line extends into the model support.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
the invention designs a novel measuring device to realize the analog measurement of the spectral modulation characteristic of the sheath of the high-speed plasma.
Drawings
FIG. 1 is a block diagram of the present invention.
In the figure: 1. a wave-transparent model; 11. the model is supported firmly; 2. a transmitting antenna; 21. a transmitting-end signal line; 3. a receiving antenna; 31. a receiving end signal line; 4. a high enthalpy gas flow.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
A high-speed plasma sheath spectrum modulation characteristic measuring device is shown in figure 1 and comprises a wave-transparent model 1, a transmitting antenna 2 and a receiving antenna 3, wherein the transmitting antenna 2 is arranged in the wave-transparent model 1, and the receiving antenna 3 is arranged outside the wave-transparent model 1 and is positioned right below the transmitting antenna 2. The transmitting end face of the transmitting antenna 3 is parallel to the bottom plane of the wave-transparent model 1, and the receiving end face of the receiving antenna 3 is opposite to the transmitting end face of the transmitting antenna 3.
As shown in fig. 1, the wave-transparent model 1 is made of a wave-transparent material (such as ceramic) with high strength and high temperature resistance, the head of the wave-transparent model 1 is a hemispherical cambered surface, the wave-transparent model 1 is located inside the high enthalpy airflow 4, the high enthalpy airflow 4 is generated in the plasma sheath simulation electromagnetic measurement system, the outer diameter of the wave-transparent model 1 is smaller than the outer diameter of the cross section of the high enthalpy airflow 4, the head of the wave-transparent model 1 faces the flow direction of the high enthalpy airflow 4, and the receiving antenna 3 is arranged outside the high enthalpy airflow 4.
As shown in fig. 1, the tail of the wave-transparent model 1 is fixedly connected with a hollow model hard support 11, a transmitting end signal line 21 is inserted in the model hard support 11, and the transmitting end signal line 21 is connected with the transmitting antenna 2. One side of the receiving antenna 3 is fixedly connected with a hollow model support, one end of the receiving antenna 3 is connected with a receiving end signal wire 31, and the receiving end signal wire 31 extends into the model support.
The device is arranged in a plasma sheath electromagnetic characteristic simulation measurement system, a wave-transparent model 1 is arranged inside high enthalpy airflow 4 generated in the plasma sheath simulation electromagnetic measurement system, and the head of the wave-transparent model 1 faces to the incoming flow direction; the transmitting antenna 2 transmits single-point frequency electromagnetic waves, the receiving antenna 3 receives broadband electromagnetic waves generated by modulating the plasma sheath by a spectrum modulation characteristic effect, and finally echo signals are processed by a plasma sheath electromagnetic characteristic analog measurement system, so that the analog measurement of the high-speed plasma sheath spectrum modulation characteristic is realized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A high-speed plasma sheath spectrum modulation characteristic measuring device is characterized in that: including passing through wave model (1), transmitting antenna (2) and receiving antenna (3), transmitting antenna (2) are arranged in passing through wave model (1), and receiving antenna (3) are arranged in passing through wave model (1) outside and are located transmitting antenna (2) under, and wherein pass through wave model (1) and are located high enthalpy air current (4) inside, pass through the flow direction of wave model (1) head towards high enthalpy air current (4), and receiving antenna (3) are arranged in outside high enthalpy air current (4).
2. A high-speed plasma sheath spectral modulation characteristic measuring apparatus according to claim 1, wherein: the head of the wave-transparent model (1) is a hemispherical cambered surface.
3. A high-speed plasma sheath spectral modulation characteristic measuring apparatus according to claim 1, wherein: the outer diameter of the wave-transparent model (1) is smaller than the outer diameter of the section of the high enthalpy airflow (4).
4. A high-speed plasma sheath spectral modulation characteristic measuring apparatus according to claim 1, wherein: the transmitting end face of the transmitting antenna (2) is parallel to the bottom plane of the wave-transparent model (1), and the receiving end face of the receiving antenna (3) is opposite to the transmitting end face of the transmitting antenna (3).
5. A high-speed plasma sheath spectral modulation characteristic measuring apparatus according to claim 1, wherein: the tail part of the wave-transparent model (1) is fixedly connected with a hollow model hard support (11), a transmitting end signal wire (21) is inserted in the model hard support (11), and the transmitting end signal wire (21) is connected with the transmitting antenna (2).
6. The apparatus of claim 5, wherein the spectral modulation characteristic of the high-speed plasma sheath is measured by: one side of the receiving antenna (3) is fixedly connected with a hollow model support, one end of the receiving antenna (3) is connected with a receiving end signal wire, and the receiving end signal wire extends into the model support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010828781.9A CN111965435A (en) | 2020-08-18 | 2020-08-18 | High-speed plasma sheath spectrum modulation characteristic measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010828781.9A CN111965435A (en) | 2020-08-18 | 2020-08-18 | High-speed plasma sheath spectrum modulation characteristic measuring device |
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| Publication Number | Publication Date |
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| CN111965435A true CN111965435A (en) | 2020-11-20 |
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| CN202010828781.9A Pending CN111965435A (en) | 2020-08-18 | 2020-08-18 | High-speed plasma sheath spectrum modulation characteristic measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029493A (en) * | 2021-03-10 | 2021-06-25 | 北京环境特性研究所 | Method for measuring Doppler effect of plasma sheath of simulated target reentry section in wind tunnel |
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