CN206339653U - Combined type millimeter wave imaging system - Google Patents

Abstract

The utility model relates to a composite millimeter-wave imaging system, which comprises a millimeter-wave transmitter for emitting millimeter-wave transmission signals to a measured object, used for scanning the measured object, receiving the millimeter-wave transmission signal from the The echo signal reflected by the measured object and the millimeter-wave radiation signal radiated by the measured object are used to change the propagation path of the echo signal and the millimeter-wave radiation signal. The echo signal and the millimeter-wave radiation signal are processed and converted into a millimeter-wave detector for the image data of the measured object; the millimeter-wave signal is emitted to the measured object, and the measured object is scanned by a combined plane mirror, and the received The echo signal reflected by the millimeter-wave emission signal from the measured object and the millimeter-wave radiation signal radiated from the measured object itself enhance the signal intensity received by the millimeter-wave detector of the passive millimeter-wave imaging system, and the image is clear and the detection effect is high. it is good.

Description

Compound millimeter wave imaging system

technical field

The utility model relates to the field of millimeter wave imaging, in particular to a composite millimeter wave imaging system.

Background technique

Due to the advantages of high precision, strong anti-interference ability, and no harm to the human body, millimeter wave has gradually become an important detection method in the fields of security inspection and quality inspection.

At present, the passive millimeter-wave imaging system collects the millimeter-wave signal radiated from the measured object and images it, so as to realize the inspection of the measured object. Since the millimeter wave signal radiated by the measured object is relatively weak, there is a problem of unclear imaging.

Utility model content

Based on this, it is necessary to provide a composite millimeter-wave imaging system with clear imaging and good detection effect.

A compound millimeter wave imaging system, comprising:

The millimeter wave transmitter is used to transmit the millimeter wave transmitting signal to the measured object;

Combining plane reflectors for scanning the measured object, receiving the echo signal reflected from the measured object by the millimeter-wave emission signal and the millimeter-wave radiation signal radiated by the measured object, and changing the Describe the propagation path of the echo signal and the millimeter wave radiation signal;

The millimeter wave detector is used to process the echo signal and the millimeter wave radiation signal, and convert them into image data of the measured object.

The above-mentioned compound millimeter-wave imaging system transmits millimeter-wave signals to the measured object, scans the measured object through a combined plane mirror, and receives the echo signal reflected from the measured object by the millimeter-wave transmitted signal and the self-radiation of the measured object. The emitted millimeter wave radiation signal enhances the signal intensity received by the millimeter wave detector of the passive millimeter wave imaging system, resulting in clear imaging and good detection effect.

Description of drawings

Fig. 1 is a schematic structural diagram of a composite millimeter-wave imaging system in an embodiment;

Fig. 2 is a structural schematic diagram of a compound millimeter-wave imaging system scanning the measured object along the vertical direction in an embodiment;

Fig. 3 is a schematic diagram of the structure of the compound millimeter-wave imaging system scanning the measured object along the horizontal direction in an embodiment.

detailed description

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of a compound millimeter-wave imaging system in an embodiment.

In this embodiment, the composite millimeter-wave imaging system includes a millimeter-wave transmitter 10 , a combined plane mirror and a millimeter-wave detector 13 .

The millimeter wave transmitter 10 is used to transmit millimeter wave transmitting signals to the measured object 20 .

In one embodiment, the millimeter wave transmitter 10 is a phased array millimeter wave transmitter, including a millimeter wave radiation source and a phased array antenna. The phased array millimeter wave transmitter can scan the measured object 20 without mechanical movement, and is easy to operate, fast in scanning speed and good in effect.

In one of the embodiments, the phased array antenna is a linear array antenna or a planar array antenna, which are respectively used for one-dimensional scanning or two-dimensional scanning of the object under test 20, and correspondingly realize the one-dimensional scanning of the beam emitted by the millimeter wave transmitter 10. Dimensional pointing variable or two-dimensional pointing variable. Among them, the planar array antenna can realize two-dimensional scanning, and the scanning speed is faster, which can be selected according to actual needs.

The combined plane mirror is used to scan the measured object 20, receive the echo signal reflected from the measured object 20 by the millimeter-wave emission signal and the millimeter-wave radiation signal radiated from the measured object 20, and The propagation path of the echo signal and the millimeter wave radiation signal is changed.

The combined planar mirror scans the measured object 20 two-dimensionally by coordinating the rotation, receives the millimeter-wave detection signal jointly formed by the echo signal and the millimeter-wave radiation signal, and changes the propagation path of the millimeter-wave detection signal so that the mm-wave The wave detector 13 receives it.

In one of the embodiments, referring to FIG. 2 , the above-mentioned composite plane mirror includes a first plane mirror 11 and a second plane mirror 12, and the first plane mirror 11 and the second plane mirror 12 are rotated in cooperation to realize alignment. Two-dimensional scanning of the measured object 20 .

The first plane reflector 11 is located at the front end of the signal receiving channel, receives the above-mentioned millimeter-wave detection signal, and changes its propagation path through reflection, and the second plane reflector 12 is located at the end of the signal receiving channel, and receives the signal sent by the first plane reflector 11. The millimeter-wave detection signal is changed, and its propagation path is changed, so that the millimeter-wave detector 13 can receive it conveniently.

The millimeter wave detector 13 is used to process the echo signal and the millimeter wave radiation signal, and convert them into image data of the measured object 20 .

In one of the embodiments, the millimeter wave detector 13 includes a receiving antenna, a first amplifier, a detector, a filter and a second amplifier connected in sequence, and the receiving antenna is used to receive the echo signal and the millimeter wave radiation Signal. Wherein, the first amplifier is a low noise amplifier, and the second amplifier is a low frequency amplifier. The detector is a square-law detector, and its output signal is approximately proportional to the square of the instantaneous value of the oscillation envelope of the input signal. It does not need to mix the received millimeter-wave detection signal, which is simple and convenient, and speeds up the signal processing. process.

In one of the embodiments, the compound millimeter wave imaging system further includes a scan control module, the scan control module is used to control the rotation of the first plane reflector 11 and the second plane reflector 12, so as to realize the Two-dimensional scanning of the object 20 to be measured.

In one of the embodiments, the composite millimeter-wave imaging system further includes a lens 14, which is arranged between the signal receiving channel formed by the first plane mirror 11 and the second plane mirror 12, and is used for The millimeter-wave detection signal received by a plane mirror 11 is focused and sent to the second plane mirror 12 .

This lens 14 comprises a first plano-convex lens and a second plano-convex lens, the plane of the first plano-convex lens is attached to the plane of the second plano-convex lens, and the thickness of the second plano-convex lens is greater than that of the first plano-convex lens thickness. The first plano-convex lens receives the millimeter-wave detection signal reflected by the first plane mirror 11, and performs focusing processing on it, and then sends it to the second plane mirror 12 after further focusing processing by the second plano-convex lens, and the focusing effect is good.

Specifically, referring to FIG. 2, when the combined plane mirror scans the measured object 20 along the vertical direction, that is, the Z axis, if the millimeter-wave detection signal is incident on the first plane mirror 11 along the direction perpendicular to the Z axis, After being reflected by the first plane mirror 11, it is emitted along a direction parallel to the Z-axis; if the incident angle of the millimeter-wave detection signal is deflected by α degrees, as shown by the incident dotted line in the figure, in order to ensure that it passes through the first The propagation direction of the signal reflected by the plane mirror 11 remains unchanged, and the first plane mirror 11 needs to be rotated by α/2 degrees accordingly, as shown by the first plane mirror 11 indicated by the dotted line.

Referring to Fig. 3, when the combined plane mirror scans the measured object 20 along the horizontal direction, that is, the Y axis, if the millimeter-wave detection signal is incident on the first plane mirror 11 along the direction perpendicular to the Y axis, it passes through the first After being reflected by the plane reflector 11, it is emitted along a direction parallel to the Y axis, and after being reflected again by the second plane reflector 12, it is emitted along a direction perpendicular to the Y axis, so as to facilitate the reception of the millimeter wave detector 13; The incident angle of the millimeter-wave detection signal is deflected by α degrees, as shown by the incident dotted line in the figure, in order to ensure that the signal propagation direction after being reflected by the second plane mirror 12 remains unchanged, so that the millimeter-wave detector 13 can receive it. The second plane reflector 12 needs to be rotated correspondingly by a certain angle, as shown by the second plane reflector 12 indicated by the dotted line.

By controlling the rotation of the first reflecting plane mirror 11 and the second plane reflecting mirror 12 in the above manner, the two-dimensional scanning of the measured object 20 can be realized, and the millimeter-wave detector 13 can fully obtain the millimeter-wave detection signal of the measured object, and the detection sensitivity can be improved. High, good imaging effect.

In one embodiment, the compound millimeter-wave imaging system further includes an image processing module 15 configured to process the image data and generate a two-dimensional image of the measured object 20 .

After the millimeter wave detector 13 acquires the image data of the object under test 20, the image data is processed by the image processing module 15 to obtain a two-dimensional image of the object under test 20, which is convenient for security personnel or quality inspection personnel to inspect. In addition, the composite millimeter-wave imaging system may also include an alarm reminder module, which sends an alarm reminder when it is found that the measured object 20 is carrying dangerous items.

The above compound millimeter-wave imaging system transmits millimeter-wave transmission signals to the measured object 20, and performs two-dimensional scanning on the measured object 20 through a combined plane mirror. The echo signal formed after the reflection of the object 20, on the other hand, receives the millimeter wave radiation signal radiated by the measured object 20 itself at the same time, forming a composite millimeter wave imaging system combining active and passive, which enhances the passive millimeter wave imaging system. The receiving signal strength of the wave imaging system is simple, and the imaging effect is good.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (9)

1. a kind of combined type millimeter wave imaging system, it is characterised in that including：

Millimeter wave launcher, for launching millimeter wave transmission signal to measurand；

Combined planar speculum, for being scanned to measurand, receives the millimeter wave transmission signal from described tested pair As the millimeter-wave radiation signal that the echo-signal and the measurand that reflect are radiated, and change the echo-signal With the propagation path of millimeter-wave radiation signal；

Millimeter wave detector, for handling the echo-signal and millimeter-wave radiation signal, and is converted into described tested The view data of object.

2. combined type millimeter wave imaging system according to claim 1, it is characterised in that the millimeter wave launcher is phase Control battle array millimeter wave launcher, including millimeter-wave radiation source and phased array antenna.

3. combined type millimeter wave imaging system according to claim 2, it is characterised in that the phased array antenna is linear Array antenna or planar array antenna, are respectively used to carry out one-dimensional scanning or two-dimensional scan to the measurand.

4. combined type millimeter wave imaging system according to claim 1, it is characterised in that the combined planar speculum bag The first plane mirror and the second plane mirror are included, first plane mirror and the second plane mirror coordinate rotation, To realize the two-dimensional scan to measurand.

5. combined type millimeter wave imaging system according to claim 4, it is characterised in that also including scan control module, The scan control module is used to control first plane mirror and the second plane mirror to coordinate rotation, to realize to quilt Survey the two-dimensional scan of object.

6. combined type millimeter wave imaging system according to claim 4, it is characterised in that also including lens, is arranged at institute Between the millimeter wave receiving channel for stating the first plane mirror and the formation of the second plane mirror, for anti-to first plane The echo-signal for penetrating mirror reception is focused processing, and is sent to second plane mirror.

7. combined type millimeter wave imaging system according to claim 6, it is characterised in that the lens include the first plano-convex Lens and the second planoconvex spotlight, the plane of first planoconvex spotlight are fitted with the plane of second planoconvex spotlight, and described The thickness of two planoconvex spotlights is more than the thickness of first planoconvex spotlight.

8. combined type millimeter wave imaging system according to claim 1, it is characterised in that the millimeter wave detector includes Reception antenna, the first amplifier, wave detector, wave filter and the second amplifier being sequentially connected, the reception antenna are used to receive The echo-signal and millimeter-wave radiation signal.

9. combined type millimeter wave imaging system according to claim 1, it is characterised in that also including image processing module, For handling described image data, and generate the two dimensional image of the measurand.