CN110389388B - Mechanical linkage scanning type passive millimeter wave imaging device - Google Patents
Mechanical linkage scanning type passive millimeter wave imaging device Download PDFInfo
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- CN110389388B CN110389388B CN201910721623.0A CN201910721623A CN110389388B CN 110389388 B CN110389388 B CN 110389388B CN 201910721623 A CN201910721623 A CN 201910721623A CN 110389388 B CN110389388 B CN 110389388B
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
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Abstract
A mechanical linkage scanning type passive millimeter wave imaging device belongs to the technical field of millimeter wave imaging. The passive millimeter wave imaging device aims to solve the problem that the existing passive millimeter wave imaging device needs to be provided with more radiometers to make up for the deficiency of resolution. The invention quantitatively rotates the ellipsoidal reflector at the bottom in a mechanical linkage mode, changes the direction angle of a millimeter wave beam in the horizontal direction, and combines the scanning in the vertical direction of the reflector, thereby achieving the two-dimensional scanning of the millimeter wave beam, making up the defects of the original single reflector scanning mode, doubling the signal acquisition number and greatly improving the resolution of scanning imaging. Meanwhile, the requirement on the number of radiometers is reduced, radiometer arrays are convenient to assemble, only one rotating motor is needed for control, and the manufacturing and maintenance cost of the movable millimeter wave imaging device can be reduced.
Description
Technical Field
The invention relates to a mechanical linkage scanning type passive millimeter wave imaging device, and belongs to the technical field of millimeter wave imaging.
Background
In recent years, aviation safety gradually becomes an important component of national safety, and civil aviation security inspection urgently needs a device capable of rapidly and comprehensively detecting personal belongings of a human body. Millimeter waves can penetrate common clothes and have no ionization property, and therefore, millimeter wave imaging technology is receiving wide attention.
In the prior art, a passive millimeter wave imaging device usually uses only a method of rotating a reflector plate to realize beam scanning, for example, a patent of invention 'a passive millimeter wave imaging security inspection device' with an authorization publication number of CN104076358 discloses a mature passive millimeter wave imaging device, which uses a method of only rotating a reflector plate to realize beam scanning in a vertical direction, receives signals through two rows of receiving antennas with certain dislocation in a horizontal direction, and finally realizes imaging through processing of sampling signals. The invention patent with application publication number CN106154345A, ellipsoidal passive millimeter wave imaging system, also uses only the method of rotating the reflective plate to realize beam scanning. In the prior art, only a single rotating reflecting plate is used, and the reflecting plate can only realize beam scanning in the vertical direction, so that the sampling number in the horizontal direction is small, and more radiometers are generally arranged on a receiving antenna in the horizontal direction to make up for the problem of insufficient resolution. Therefore, such millimeter wave imaging devices tend to be costly.
In order to solve the problem of insufficient imaging resolution in the invention, the patent provides a scanning type passive millimeter wave imaging device with an ellipsoidal reflecting surface and a reflecting plate in mechanical linkage.
Disclosure of Invention
The invention provides a mechanical linkage scanning type passive millimeter wave imaging device, aiming at solving the problem that the prior passive millimeter wave imaging device needs to be provided with more radiometers to make up for the insufficient resolution.
The technical scheme of the invention is as follows:
the mechanical linkage scanning type passive millimeter wave imaging device comprises a mounting rack 0, an ellipsoidal reflecting surface 1, a rotating mechanism 5, a transmission rod 4, a reflecting plate 2 and a receiving antenna 3, wherein the ellipsoidal reflecting surface 1 and the rotating mechanism 5 are mounted at the lower part of the mounting rack 0, the reflecting plate 2 and the receiving antenna 3 are mounted at the upper part of the mounting rack 0, and the reflecting plate 2 is positioned between a measured object and the receiving antenna 3; one end of the transmission rod 4 is connected with the reflecting plate 2, and the other end of the transmission rod 4 is connected with the rotating mechanism 5; the reflecting plate 2 reflects the millimeter waves radiated by the object to be measured to the ellipsoidal reflecting surface 1, and the ellipsoidal reflecting surface 1 reflects the millimeter waves to the receiving antenna 3 after focusing.
Preferably: the receiving antenna 3 is a radiometer array which is horizontally arranged in a row.
Preferably: the reflecting plate 2 is provided with a reflecting plate mounting seat 2-1 and a transmission rod mounting shaft 2-2, the two reflecting plate mounting seats 2-1 are respectively rotatably mounted with the middle points of the two side edges of the reflecting plate 2, and the two shooting plate mounting seats 2-1 are horizontally and fixedly mounted on the upper part of the mounting frame 0; the transmission rod mounting shaft 2-2 is mounted on the side edge of the reflection plate 2, one end of the transmission rod 4 is sleeved on the transmission rod mounting shaft 2-2, and the transmission rod 4 rotates around the transmission rod mounting shaft 2-2.
Preferably: the inner wall of the ellipsoid reflecting surface 1 is a smooth reflecting surface, the outer wall of the ellipsoid reflecting surface 1 is of a latticed framework structure, rotating shafts are symmetrically fixed on two sides of the outer wall of the ellipsoid reflecting surface 1, the two rotating shafts are respectively installed with a low shaft seat 1-1 and a high shaft seat 1-2, and the low shaft seat 1-1 and the high shaft seat 1-2 rotate along the axis of the rotating shafts; the lower shaft seat 1-1 is fixedly arranged at the lower part of the mounting rack 0 close to the side of the receiving antenna 3; the high shaft seat 1-2 is fixedly arranged at the lower part of the mounting rack 0 close to the side of the measured object through a foot pad 1-4, so that the ellipsoid reflecting surface 1 rotates around the rotating shaft; the positioning plate 1-3 is arranged at the edge of the other side of the outer wall of the ellipsoidal reflecting surface 1 through a bolt; the positioning plate 1-3 is a rectangular plate provided with 6 through holes, the 6 through holes comprise 4 mounting through holes and 2 hanging through holes 1-4, the 4 mounting through holes are fixedly mounted with a latticed framework on the outer wall of the ellipsoid reflecting surface 1 through bolts, and the 2 hanging through holes 1-4 are respectively hung with one end of a spring 12-3.
Preferably: the rotating mechanism 5 comprises a rotating motor 9, a motor gear 9-1, a rotating disc assembly 10, a disc gear 10-1, a remote rod 11 and a double-lug seat 12, wherein the double-lug seat 12 is fixedly arranged at the lower part of the mounting frame 0, and the rotating disc assembly 10, the disc gear 10-1 and the remote rod 11 are arranged between two lug plates of the double-lug seat 12; the rotating disc assembly 10 comprises a disc and a fixed shaft, the disc is formed by splicing two semicircles with different radiuses, the fixed shaft is arranged on the surface of one side of the disc close to the edge of the disc, the other end of the transmission rod 4 is sleeved on the fixed shaft, and the transmission rod 4 rotates around the fixed shaft; the other side surface of the disc is fixedly arranged with the disc gear 10-1, and the center of the disc is superposed with the center of the disc gear 10-1; the rotary disc assembly 10 and the disc gear 10-1 are connected and mounted with an ear plate of the double-lug seat 12 through a rotating shaft, the rotary disc assembly 10 and the disc gear 10-1 rotate around the rotating shaft, two positioning bolt mounting holes 12-2 are symmetrically formed in the lower portion of the ear plate, and the axis of each positioning bolt mounting hole 12-2 is perpendicular to the axis of the disc gear 10-1; one end of the remote rod 11 is rotatably arranged on the other ear plate of the double-ear seat 12 through a rotating shaft, and the other end of the remote rod 11 is arranged on a fixed shaft of the rotating disc assembly 10 to limit the moving position of the transmission rod 4 along the axial direction of the fixed shaft; the rotating motor 9 is fixedly arranged at the lower part of the mounting rack 0 through a motor base, a motor gear 9-1 is sleeved on a rotating shaft of the rotating motor 9, and the motor gear 9-1 and the disc gear 10-1 are meshed and arranged.
Preferably: the disc is formed by splicing a semicircle with the radius of 59mm and a semicircle with the radius of 60 mm.
Preferably: the positioning plates 1-3 are positioned right above the discs of the rotating disc assembly 10.
Preferably: the two positioning bolt mounting holes 12-2 are respectively provided with a positioning bolt 12-1, the two positioning bolts 12-1 are respectively hung with the other end of the spring 12-3, and the spring 12-3 enables the positioning plate 1-3 of the ellipsoid reflecting surface 1 to always abut against the right upper part of the disc of the rotating disc component 10.
Preferably: the device also comprises a control module, a signal processing module and a computer, wherein the control module and the signal processing module are respectively connected with the computer, the computer processes and extracts the millimeter waves received by the receiving antenna 3 through the signal processing module, and the computer controls the rotation of the rotating motor 9 through the control module.
The invention has the following beneficial effects: the invention relates to a mechanical linkage scanning type passive millimeter wave imaging device, which quantitatively rotates an ellipsoidal reflecting surface at the bottom in a mechanical linkage mode, changes the direction angle of a millimeter wave beam in the horizontal direction, and combines the vertical direction scanning of a reflecting plate, thereby achieving the two-dimensional scanning of the millimeter wave beam, making up the defects of the original single reflecting plate scanning mode, doubling the signal acquisition number and greatly improving the resolution ratio of scanning imaging. Meanwhile, the requirement on the number of radiometers is reduced, radiometer arrays are convenient to assemble, only one rotating motor is needed for control, and the manufacturing and maintenance cost of the movable millimeter wave imaging device can be reduced. The imaging mode of the device is more flexible and changeable, a plurality of one-dimensional scanning images obtained by different angles in the horizontal direction can be synthesized, data obtained by sampling all two-dimensional signals can be directly imaged, the two methods can be adopted simultaneously, the precision and the fault tolerance rate are improved through comparison, and the misjudgment rate of imaging is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 4 is an enlarged view of FIG. 3 at point A;
FIG. 5 is a schematic structural view of a reflector plate;
FIG. 6 is a schematic structural diagram of an ellipsoidal reflecting surface;
FIG. 7 is a bottom view of FIG. 6;
FIG. 8 is an enlarged view of FIG. 7 at B;
FIG. 9 is a perspective view of the rotating mechanism;
FIG. 10 is a side view of FIG. 9;
FIG. 11 is a cross-sectional view taken along A-A of FIG. 10;
FIG. 12 is a cross-sectional view taken along line B-B of FIG. 10;
FIG. 13 is a schematic perspective view of a disk;
FIG. 14 is a schematic view of the structure of the disk;
FIG. 15 is a light path diagram of the present invention;
in the figure, 0-mounting rack, 1-ellipsoid reflecting surface, 2-reflecting plate, 3-receiving antenna, 4-transmission rod, 5-rotating mechanism, 9-rotating motor, 10-disk component, 11-remote rod, 12-double ear seat, 1-1-low axle seat, 1-2-high axle seat, 1-3-positioning plate, 1-4-hanging through hole, 2-1-reflecting plate mounting seat, 2-2-transmission rod mounting shaft, 9-1-motor gear, 10-1-disk gear, 12-1-positioning bolt, 12-2-positioning bolt mounting hole and 12-3-spring.
Detailed Description
The first embodiment is as follows:
the embodiments of the present invention will be described with reference to the accompanying drawings 1 to 15: the invention relates to a mechanical linkage scanning type passive millimeter wave imaging device, which comprises a mounting frame 0, an ellipsoid reflecting surface 1, a rotating mechanism 5, a transmission rod 4, a reflecting plate 2 and a receiving antenna 3, wherein the ellipsoid reflecting surface 1 and the rotating mechanism 5 are mounted at the lower part of the mounting frame 0, the reflecting plate 2 and the receiving antenna 3 are mounted at the upper part of the mounting frame 0, and the reflecting plate 2 is positioned between a measured object and the receiving antenna 3; one end of the transmission rod 4 is connected with the reflecting plate 2, and the other end of the transmission rod 4 is connected with the rotating mechanism 5; the reflecting plate 2 reflects the millimeter waves radiated by the object to be measured to the ellipsoidal reflecting surface 1, and the ellipsoidal reflecting surface 1 focuses the millimeter waves and then reflects the millimeter waves to the receiving antenna 3. With such an arrangement, as shown in fig. 1 to 3, the millimeter waves radiated by the object to be measured are reflected to the ellipsoidal reflecting surface 1 through the reflecting plate 2, and the millimeter waves are reflected to the receiving antenna 3 by utilizing the focusing characteristics of the two focuses of the ellipsoidal reflecting surface 1, and the transmission mechanism 5 of the device can drive the reflecting plate 2 to rotate through the transmission rod, and can also control the rotation of the ellipsoidal reflecting surface 1. When the reflecting plate 2 rotates for a period to scan the vertical direction to obtain a group of data, the ellipsoidal reflecting surface 1 rotates to deflect the horizontal direction of the wave beam, then the reflecting plate 2 rotates in the opposite direction through the driving rod 4 to obtain the next group of data in the vertical direction, and the ellipsoidal reflecting surface 1 is driven to rotate again after the reflecting plate 2 rotates for the period. And repeating the process to obtain a plurality of groups of sampling data in the vertical direction. The fault tolerance rate of imaging can be improved by respectively imaging each group of data and then synthesizing a plurality of obtained images. All the sampling data can be directly imaged, and the resolution is improved. The two imaging methods can be simultaneously used, and the imaging results of the two schemes are compared, so that the respective defects of the two methods are overcome.
The receiving antenna 3 is a radiometer array which is horizontally arranged in a row. So arranged, one focus of the ellipsoidal reflecting surface 1 is positioned on the straight line of the receiving antenna 3. The receiving antenna 3 converts the received focused millimeter wave signal into a voltage signal and sends the voltage signal to the signal processing module.
The reflecting plate 2 is provided with a reflecting plate mounting seat 2-1 and a transmission rod mounting shaft 2-2, the two reflecting plate mounting seats 2-1 are respectively rotatably mounted with the middle points of the two side edges of the reflecting plate 2, and the two shooting plate mounting seats 2-1 are horizontally and fixedly mounted on the upper part of the mounting frame 0; the transmission rod mounting shaft 2-2 is mounted on the side edge of the reflection plate 2, one end of the transmission rod 4 is sleeved on the transmission rod mounting shaft 2-2, and the transmission rod 4 rotates around the transmission rod mounting shaft 2-2. So set up, as shown in fig. 5, reflecting plate 2 is installed on mounting bracket 0 by reflecting plate mount pad 2-1 to reflecting plate 2 can the mounting point rotate, the suit of one end of transfer line 4 is on transfer line installation axle 2-2, and transfer line 4 rotates around transfer line installation axle 2-2, consequently when transfer line 4 moved, can drive reflecting plate 2 and rotate around the mounting point of reflecting plate mount pad 2-1 and reflecting plate 2, realize the testee millimeter wave of 2 multi-angle launches of reflecting plate then.
The inner wall of the ellipsoid reflecting surface 1 is a smooth reflecting surface, the outer wall of the ellipsoid reflecting surface 1 is of a latticed framework structure, rotating shafts are symmetrically fixed on two sides of the outer wall of the ellipsoid reflecting surface 1, the two rotating shafts are respectively installed with a low shaft seat 1-1 and a high shaft seat 1-2, and the low shaft seat 1-1 and the high shaft seat 1-2 rotate along the axis of the rotating shafts; the lower shaft seat 1-1 is fixedly arranged at the lower part of the mounting rack 0 close to the side of the receiving antenna 3; the high shaft seat 1-2 is fixedly arranged at the lower part of the mounting frame 0 close to the side of the measured object through a foot pad 1-4, so that the ellipsoid reflecting surface 1 rotates around the rotating shaft; the edge of the other side of the outer wall of the ellipsoid reflecting surface 1 is provided with a positioning plate 1-3 through a bolt; the positioning plate 1-3 is a rectangular plate provided with 6 through holes, the 6 through holes comprise 4 mounting through holes and 2 hanging through holes 1-4, the 4 mounting through holes are fixedly mounted with the latticed framework on the outer wall of the ellipsoidal reflecting surface 1 through bolts, and the 2 hanging through holes 1-4 are respectively hung with one end of a spring 12-3. With such an arrangement, as shown in fig. 6 to 8, the outer wall of the ellipsoidal reflecting surface 1 has a grid-shaped skeleton structure, so that the self weight can be reduced; the two sides of the outer wall of the ellipsoid reflecting surface 1 are symmetrically fixed with rotating shafts, the two rotating shafts are respectively installed with the low shaft seat 1-1 and the high shaft seat 1-2, and after the low shaft seat 1-1 and the high shaft seat 1-2 are fixedly installed, the ellipsoid reflecting surface 1 can rotate around the rotating shafts symmetrically fixed on the two sides of the outer wall.
The rotating mechanism 5 comprises a rotating motor 9, a motor gear 9-1, a rotating disc assembly 10, a disc gear 10-1, a remote rod 11 and a double-lug seat 12, wherein the double-lug seat 12 is fixedly arranged at the lower part of the mounting frame 0, and the rotating disc assembly 10, the disc gear 10-1 and the remote rod 11 are arranged between two lug plates of the double-lug seat 12; the rotating disc assembly 10 comprises a disc and a fixed shaft, the disc is formed by splicing two semicircles with different radiuses, the fixed shaft is arranged on the surface of one side of the disc close to the edge of the disc, the other end of the transmission rod 4 is sleeved on the fixed shaft, and the transmission rod 4 rotates around the fixed shaft; the surface of the other side of the disc is fixedly arranged with the disc gear 10-1, and the center of the disc is superposed with the center of the disc gear 10-1; the rotary disc assembly 10 and the disc gear 10-1 are connected and mounted with an ear plate of the double ear seat 12 through a rotating shaft, the rotary disc assembly 10 and the disc gear 10-1 rotate around the rotating shaft, two positioning bolt mounting holes 12-2 are symmetrically formed in the lower portion of the ear plate, and the axis of each positioning bolt mounting hole 12-2 is perpendicular to the axis of the disc gear 10-1; one end of the remote rod 11 is rotatably arranged on the other ear plate of the double-ear seat 12 through a rotating shaft, and the other end of the remote rod 11 is arranged on a fixed shaft of the rotating disc assembly 10 to limit the moving position of the transmission rod 4 along the axial direction of the fixed shaft; the rotating motor 9 is fixedly arranged at the lower part of the mounting frame 0 through a motor base, a motor gear 9-1 is sleeved on a rotating shaft of the rotating motor 9, and the motor gear 9-1 and the disk gear 10-1 are meshed and mounted. The disc is formed by splicing a semicircle with the radius of 59mm and a semicircle with the radius of 60 mm. The two positioning bolt mounting holes 12-2 are respectively provided with a positioning bolt 12-1, the two positioning bolts 12-1 are respectively hung with the other end of the spring 12-3, and the spring 12-3 enables the positioning plate 1-3 of the ellipsoid reflecting surface 1 to always abut against the right upper part of the disc of the rotating disc component 10. With such an arrangement, as shown in fig. 4 and fig. 9 to 14, when the rotating motor 9 rotates, the motor gear 9-1 is driven to rotate, and then the disc gear 10-1 and the rotating disc assembly 10 are driven to rotate, the fixed shaft of the rotating disc assembly 10 drives the transmission rod 4 to transmit, and then the reflection plate 2 is driven to rotate, so that the millimeter waves of the object to be measured transmitted by the reflection plate 2 at multiple angles are realized, and the receiving antenna 3 obtains a set of sampling data in the vertical direction. Because the disc is formed by splicing a semicircle with the radius of 59mm and a semicircle with the radius of 60mm, the positioning plate 1-3 of the ellipsoid reflecting surface 1 always abuts right above the disc under the action of the spring 12-3, when the radius of the disc at the contact part of the disc and the ellipsoid reflecting surface 1 is changed, the ellipsoid reflecting surface 1 rotates around the rotating shaft symmetrically fixed at the two sides of the wall of the ellipsoid reflecting surface, and then the reflecting plate 2 emits millimeter waves of a measured object at multiple angles again, so that the receiving antenna 3 obtains another group of sampling data in the vertical direction.
The device also comprises a control module, a signal processing module and a computer, wherein the control module and the signal processing module are respectively connected with the computer, the computer processes and extracts the millimeter waves received by the receiving antenna 3 through the signal processing module, and the computer controls the rotation of the rotating motor 9 through the control module.
The working process of the application is realized as follows: when the device is started and normally operates, an object to be measured stands to the position 1.8 meters right in front of the device, the transmission rod 4 is located at the highest point, the radius of 60mm of the disk props against the positioning plates 1-3 of the ellipsoid reflecting surface 1, as shown in fig. 15, millimeter waves radiated by a certain point on the object to be measured are transmitted by the reflecting plate 2 to reach the ellipsoid reflecting surface 1 and then are converged at the receiving antenna 3, the rotating motor 9 is controlled, the rotating disk assembly 10 starts to rotate anticlockwise to drive the transmission rod 4 at the highest point to move downwards, so that the reflecting plate 2 rotates clockwise, each radiometer of the receiving antenna 3 can obtain N sampling data in the vertical direction, and 64 × N sampling data (assuming that the receiving antenna 3 has 64 radiometers), and when the signal processing module obtains the last data by controlling the sampling frequency of the signal processing module and the rotating speed of the driving motor through the computer, the transmission rod 4 reaches the lowest point, the radius of a circular disc at the contact position of the circular disc and the positioning plate 1-3 of the ellipsoid reflecting surface 1 is changed from 60mm to 59mm at the moment, the ellipsoid reflecting surface 1 rotates around a rotating shaft symmetrically fixed on two sides of the wall of the ellipsoid reflecting surface, one side of the ellipsoid reflecting surface where the positioning plate 1-3 is installed descends by 1mm, the reflected wave beam deflects in the horizontal direction, then the rotary disc continues to rotate anticlockwise to drive the transmission rod 4 to move upwards, the reflecting plate 2 rotates anticlockwise, similarly, after 64 x N data are recorded, the transmission rod 4 reaches the highest point, the radius of the contact position of the circular disc and the positioning plate 1-3 of the ellipsoid reflecting surface 1 is changed from 59mm to 60mm, and at the moment, a sampling period is completed.
Thus, two groups of sampling data with the number of 64 × N can be obtained in one sampling period, the data are respectively imaged by using different color grayscales according to the intensity of the received signal to obtain two images, and then the two images are synthesized to obtain a more accurate image. Meanwhile, the data can be gathered into 2 × 64 × N sampling points, and another clearer image can be obtained through direct imaging. And finally, comparing the two obtained images, and improving the resolution and the fault tolerance.
This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.
Claims (7)
1. Passive millimeter wave image device of mechanical linkage scanning formula, its characterized in that: the device comprises an installation rack (0), an ellipsoid reflecting surface (1), a rotating mechanism (5), a transmission rod (4), a reflecting plate (2) and a receiving antenna (3), wherein the ellipsoid reflecting surface (1) and the rotating mechanism (5) are installed at the lower part of the installation rack (0), the reflecting plate (2) and the receiving antenna (3) are installed at the upper part of the installation rack (0), and the reflecting plate (2) is positioned between a measured object and the receiving antenna (3); one end of the transmission rod (4) is connected with the reflecting plate (2), and the other end of the transmission rod (4) is connected with the rotating mechanism (5); the reflecting plate (2) reflects millimeter waves radiated by a measured object to the ellipsoidal reflecting surface (1), and the ellipsoidal reflecting surface (1) focuses the millimeter waves and then reflects the millimeter waves to the receiving antenna (3);
the inner wall of the ellipsoid reflecting surface (1) is a smooth reflecting surface, the outer wall of the ellipsoid reflecting surface (1) is of a latticed framework structure, rotating shafts are symmetrically fixed on two sides of the outer wall of the ellipsoid reflecting surface (1), the two rotating shafts are respectively installed with a low shaft seat (1-1) and a high shaft seat (1-2), and the low shaft seat (1-1) and the high shaft seat (1-2) rotate along the axis of the rotating shafts; the low shaft seat (1-1) is fixedly arranged at the lower part of the mounting rack (0) close to the side of the receiving antenna (3); the high shaft seat (1-2) is fixedly arranged at the lower part of the mounting rack (0) close to the side of the measured object through a foot pad, so that the ellipsoidal reflecting surface (1) rotates around a rotating shaft; a positioning plate (1-3) is arranged at the edge of the other side of the outer wall of the ellipsoidal reflecting surface (1) through a bolt; the positioning plate (1-3) is a rectangular plate provided with 6 through holes, the 6 through holes comprise 4 mounting through holes and 2 hanging through holes (1-4), the 4 mounting through holes and a latticed framework on the outer wall of the ellipsoid reflecting surface (1) are fixedly mounted through bolts, and the 2 hanging through holes (1-4) are respectively hung with one end of a spring (12-3);
the rotating mechanism (5) comprises a rotating motor (9), a motor gear (9-1), a rotating disc assembly (10), a disc gear (10-1), a remote rod (11) and a double lug seat (12), wherein the double lug seat (12) is fixedly arranged at the lower part of the mounting frame (0), and the rotating disc assembly (10), the disc gear (10-1) and the remote rod (11) are arranged between two lug plates of the double lug seat (12); the rotating disc assembly (10) comprises a disc and a fixed shaft, the disc is formed by splicing two semicircles with different radiuses, the fixed shaft is arranged on the surface of one side of the disc close to the edge of the disc, the other end of the transmission rod (4) is sleeved on the fixed shaft, and the transmission rod (4) rotates around the fixed shaft; the other side surface of the disc is fixedly arranged with the disc gear (10-1), and the center of the disc is superposed with the center of the disc gear (10-1); the rotary disk assembly (10) and the disk gear (10-1) are connected and mounted with an ear plate of the double-ear seat (12) through a rotating shaft, the rotary disk assembly (10) and the disk gear (10-1) rotate around the rotating shaft, two positioning bolt mounting holes (12-2) are symmetrically formed in the lower portion of the ear plate, and the axis of each positioning bolt mounting hole (12-2) is perpendicular to the axis of the disk gear (10-1); one end of the remote rod (11) is rotatably arranged on the other ear plate of the double-ear seat (12) through a rotating shaft, and the other end of the remote rod (11) is arranged on a fixed shaft of the rotating disc assembly (10) to limit the moving position of the transmission rod (4) along the axial direction of the fixed shaft;
the rotary motor (9) is fixedly arranged at the lower part of the mounting rack (0) through a motor base, a motor gear (9-1) is sleeved on a rotary shaft of the rotary motor (9), and the motor gear (9-1) and the disc gear (10-1) are meshed and arranged.
2. The mechanically linked scanning passive millimeter wave imaging device according to claim 1, characterized in that: the receiving antenna (3) is a radiometer array which is horizontally arranged in a row.
3. The mechanically linked scanning passive millimeter wave imaging device according to claim 1, characterized in that: the reflecting plate (2) is provided with reflecting plate mounting seats (2-1) and transmission rod mounting shafts (2-2), the two reflecting plate mounting seats (2-1) are respectively rotatably mounted with the middle points of two side edges of the reflecting plate (2), and the two reflecting plate mounting seats (2-1) are horizontally and fixedly mounted on the upper part of the mounting frame (0); the transmission rod mounting shaft (2-2) is mounted on the side edge of the reflecting plate (2), one end of the transmission rod (4) is sleeved on the transmission rod mounting shaft (2-2), and the transmission rod (4) rotates around the transmission rod mounting shaft (2-2).
4. The mechanically linked scanning passive millimeter wave imaging device according to claim 1, characterized in that: the disc is formed by splicing a semicircle with the radius of 59mm and a semicircle with the radius of 60 mm.
5. The mechanically linked scanning passive millimeter wave imaging device according to claim 1, characterized in that: the positioning plate (1-3) is positioned right above a disc of the rotating disc component (10).
6. The mechanically linked scanning passive millimeter wave imaging device according to claim 5, characterized in that: the two positioning bolt mounting holes (12-2) are respectively provided with a positioning bolt (12-1), the two positioning bolts (12-1) are respectively hung with the other end of the spring (12-3), and the spring (12-3) enables the positioning plate (1-3) of the ellipsoid reflecting surface (1) to always abut against the right upper part of the disc of the rotating disc component (10).
7. The mechanically linked scanning passive millimeter wave imaging device according to claim 1, characterized in that: the device also comprises a control module, a signal processing module and a computer, wherein the control module and the signal processing module are respectively connected with the computer, the computer processes and extracts the millimeter waves received by the receiving antenna (3) through the signal processing module, and the computer controls the rotation of the rotating motor (9) through the control module.
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