A real-time online detection device for millimeter-wave box missing strips with adjustable field of view

Abstract

The present invention discloses a real-time online detection device for missing strips in a millimeter-wave box with an adjustable field of view, which relates to the technical field of product detection. The device comprises a microwave transceiver alarm front end and a central display and control cabinet, wherein the microwave transceiver alarm front end and the central display and control cabinet are connected by a cable; the microwave transceiver alarm front end comprises an antenna feed component; the antenna feed component generates a three-dimensional field of view of a millimeter-wave signal, and the range of the three-dimensional field of view of the millimeter-wave signal has an adjustment function; the central display and control cabinet is installed with display and control software for controlling the operation of the microwave transceiver alarm front end, and the display and control software has a control module for adjusting the range of the three-dimensional field of view of the millimeter-wave signal; the present invention adjusts the dimensions of each dimension of the three-dimensional field of view of the millimeter-wave signal by the display and control software installed in the central display and control cabinet, so as to adapt to the detection of missing strips or missing packages of detected packaging boxes of different sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of product detection, and in particular to a millimeter-wave box stripe missing real-time online detection device with adjustable field of view. Background Art

[0002] Currently, detecting missing strips or packs in cigarette and milk packaging remains a technical challenge for manufacturers. Traditionally, manual unpacking inspections have been followed by the introduction of methods such as gram-weighing machines, X-ray detection devices, and visible or infrared camera snapshot recognition. Manual unpacking inspections incur significant labor and material costs, resulting in low detection rates and a high probability of error. While gram-weighing machines improve detection rates to a certain extent, they suffer from large errors during the inspection process and lack real-time detection capabilities. X-ray machines rely on X-ray imaging, but X-rays are known to be radioactive and pose a health risk to operators. Visible or infrared camera snapshot recognition can only be performed before the packaging is sealed; once the product is packed and stored, it cannot be inspected and confirmed. Therefore, improvements to existing technologies are necessary.

[0003] Millimeter waves, defined as electromagnetic waves with a wavelength of 1mm to 10mm, have strong penetration into most non-metallic materials and are effective for detecting a wide range of metal and non-metallic objects. Active millimeter wave imaging technology actively transmits a millimeter wave signal of a certain power toward the object being detected, inverting and measuring the target's reflection coefficient. After data processing and deep artificial intelligence learning, it captures information such as the object's shape, size, and position, generating a visual detection image. This technology's transmission power is less than one thousandth of the electromagnetic radiation emitted by a mobile phone, making it safe and reliable for the human body.

[0004] Currently, there is a box missing strip detection device developed based on this technology, but the width, height and depth of the field of view of the equipment cannot be adjusted, and it cannot adapt to the missing strip or missing package detection of packaging boxes of different sizes, which seriously restricts the promotion and use of this technology.

[0005] In view of the above-mentioned defects, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the Invention

[0006] The purpose of the present invention is to provide a real-time online detection device for millimeter-wave box missing strips with an adjustable field of view, so as to solve the problem of how to change the field of view of the detection device in the width, height and depth directions according to the size of the detection target, thereby improving the versatility and ease of use of the equipment.

[0007] The present invention solves the above-mentioned technical problems through the following technical solutions: the present invention includes a microwave transceiver alarm front end and a central display and control cabinet, and the microwave transceiver alarm front end and the central display and control cabinet are connected by a cable; the microwave transceiver alarm front end includes an antenna feed component; the antenna feed component generates a three-dimensional field of view of a millimeter wave signal, and the range of the three-dimensional field of view of the millimeter wave signal has an adjustment function; the central display and control cabinet is installed with display and control software for controlling the operation of the microwave transceiver alarm front end, and the display and control software has a control module for adjusting the range of the three-dimensional field of view of the millimeter wave signal.

[0008] Preferably, the number of the antenna feed components is two groups, and the antenna feed components include a transmitting horn antenna and a receiving horn antenna, and the horn surfaces of the transmitting horn antenna and the receiving horn antenna are both facing the conveyor.

[0009] Preferably, the microwave transceiver alarm front end also includes two supporting legs and a U-shaped shell; the two supporting legs are respectively installed on the bottom of both sides of the U-shaped shell, and the two groups of antenna feed components are symmetrically and vertically installed on both sides of the U-shaped shell.

[0010] Preferably, the frequency band of the millimeter wave signal emitted by the transmitting horn antenna can be any one of the K, Ka, and E bands.

[0011] Preferably, the U-shaped housing is provided with an audible and visual alarm module and a photoelectric trigger module.

[0012] Preferably, the dimensions of each dimension of the three-dimensional field of view of the millimeter wave signal are:

[0013] Field of view height FOV High Equal to the receiving antenna H R Array height, also known as FOV High =H R =W R ×N R , in the above formula, W R N is the distance between the two channels of the receiving antenna, R is the number of receiving antennas;

[0014] Field of view width FOV Wide Equal to the millimeter wave antenna scanning interval Δx transmitted to the direction of motion and the number of sampling sectors N x The product of FOV Wide =Δx×N x ;

[0015] Depth of field of view FOV Deep Equal to the maximum unambiguous distance of the distance dimension of the millimeter wave box missing device, that is In the above formula, c is the speed of light, B is the operating frequency bandwidth of the device, and N f The number of frequency sampling points within the frequency bandwidth.

[0016] Preferably, the antenna feed components are distributed in a full array or a sparse array.

[0017] Preferably, the central display and control cabinet 1 includes a cabinet body, an agile frequency source, a switch, a signal acquisition and processing module, a workstation, a programmable logic controller and a display; the agile frequency source, the switch, the signal acquisition and processing module, the workstation and the programmable logic controller are all integrated inside the cabinet body, and the display is arranged on the upper side of the cabinet body.

[0018] Preferably, the agile frequency source is signal-connected to the frequency conversion unit.

[0019] Preferably, four universal wheels are installed at the bottom of the central display and control cabinet, and the four universal wheels are respectively located at the four corners of the bottom of the central display and control cabinet.

[0020] Compared with the prior art, the beneficial effect of the present invention is that the dimensions of the three-dimensional field of view of the millimeter wave signal are adjusted by the display and control software installed in the central display and control cabinet, so as to adapt to the missing strip or missing package detection of the inspected packaging boxes of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 Schematic diagram of detecting three-dimensional field of view of the present invention;

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of the central display and control cabinet;

[0024] The numbers in the figure represent:

[0025] 1-Central display and control cabinet; 11-Display; 12-Workstation; 13-Agile frequency source; 14-Switch; 15-Programmable logic control device; 16-Signal acquisition and processing module; 17-Universal wheel; 2-Microwave transceiver alarm front end; 21-Sound and light alarm module; 22-Antenna feed assembly; 23-Support leg; 24-Photoelectric trigger module. DETAILED DESCRIPTION

[0026] The above and other technical features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] This embodiment provides a technical solution: a real-time online detection device for millimeter wave box missing strips with adjustable field of view, referring to Figure 1, including a microwave transceiver alarm front end 2 and a central display and control cabinet 1, the microwave transceiver alarm front end 2 and the central display and control cabinet 1 are connected by a cable; the central display and control cabinet 1 is installed with display and control software for controlling the operation of the microwave transceiver alarm front end 2, and the display and control software in the central display and control cabinet 1 can control the microwave transceiver alarm front end 2.

[0029] The microwave transceiver alarm front end 2 includes an antenna feed component 22; the antenna feed component 22 generates a three-dimensional field of view of a millimeter wave signal, and the range of the three-dimensional field of view of the millimeter wave signal has an adjustment function. The display and control software has a control module for adjusting the range of the three-dimensional field of view of the millimeter wave signal, and the millimeter wave signal three-dimensional field of view adjustment function is realized by the display and control software in the central display and control cabinet 1.

[0030] The microwave transceiver alarm front end 2 also includes two supporting legs 23 and a U-shaped shell; the two supporting legs 23 are respectively installed on the bottom of both sides of the U-shaped shell, for transporting the corresponding conveyor to be monitored, and the number of the antenna feed components 22 is two groups, and the two groups of antenna feed components 22 are symmetrically and vertically installed on both sides of the U-shaped shell. The antenna feed components 22 include a transmitting horn antenna and a receiving horn antenna, and the horn surfaces of the transmitting horn antenna and the receiving horn antenna are both facing the conveyor. The distribution of the antenna feed components 22 is full array distribution or sparse array distribution. The U-shaped shell is provided with an audible and visual alarm module 21 and a photoelectric trigger module 24. The millimeter wave signal frequency band emitted by the transmitting horn antenna can be any one of the K, Ka, and E bands.

[0031] Reference Figure 3 The central display and control cabinet 1 is the core unit of the system, providing the necessary timing control, logic control, and visual operation interface for the system. The central display and control cabinet 1 includes a cabinet body, an agile frequency source 13, a switch 14, a signal acquisition and processing module 16, a workstation 12, a programmable logic controller 15, and a display 11. The agile frequency source 13, the switch 14, the signal acquisition and processing module 16, the workstation 12, and the programmable logic controller 15 are all integrated inside the cabinet body. The display 11 is set on the upper side of the cabinet body. The display 11 is used to display the placement status of the tobacco rods inside the inspected object. Four universal wheels 17 are installed at the bottom of the central display and control cabinet 1, and the four universal wheels 17 are respectively located at the four corners of the bottom of the central display and control cabinet 1.

[0032] Reference Figure 2 , the dimensions of each dimension of the millimeter wave signal three-dimensional field of view are:

[0033] Field of view height FOV High Equal to the receiving antenna H R Array height, also known as FOV High =H R =WR ×N R , in the above formula, W R N is the distance between the two channels of the receiving antenna, R is the number of receiving antennas;

[0034] Field of view width FOV Wide Equal to the millimeter wave antenna scanning interval Δx transmitted to the direction of motion and the number of sampling sectors N x The product of FOV Wide =Δx×N x ;

[0035] Depth of field of view FOV Deep Equal to the maximum unambiguous distance of the distance dimension of the millimeter wave box missing device, that is In the above formula, c is the speed of light, B is the operating frequency bandwidth of the device, and Nf is the number of frequency sampling points within the frequency bandwidth.

[0036] Example 2

[0037] This embodiment is described using the K-band millimeter wave as follows:

[0038] The distance between the two channels of the receiving antenna is W R 10.5mm, the maximum number of receiving antennas installed is N R If it is 64, then the field of view height FOV High =672mm;

[0039] Scanning interval Δx = 4mm, number of sampling sectors = 200, then the field of view width FOV Wide =800mm;

[0040] The operating frequency range is 24GHz to 30GHz, the bandwidth B = 6GHz, and the maximum number of frequency sampling points N f =40, the maximum depth of field FOV Deep =1000m.

[0041] In actual use, various reflectors outside the detection target area will introduce stray echo signals, which will be superimposed on the target image. The imaging area outside the target area should be minimized. In addition, the packaging box sizes of products produced on different production lines vary, and the factory default parameters may not meet actual usage needs, requiring adjustment of the detection field of view.

[0042] Therefore, the packaging box size of the production line where the equipment is installed can be input into the display and control software of the millimeter wave box missing strip detection device to adjust the field of view height. Taking the packaging box size of 450mm×450mm×450mm as an example:

[0043] The display and control software reserves a 50mm detection margin in each direction of the field of view: the actual detection field of view is 500mm×500mm×500mm.

[0044] The 500mm field of view height is less than the maximum field of view height of 672mm. The display and control software sets the data of the top 16 channels of the receiving antenna to 0 to reduce the impact of stray reflections on the true image signal. To control hardware costs, these 16 channels can be left uninstalled and the data set to 0 without affecting image quality.

[0045] The 500mm field of view width is smaller than the 800mm field of view width. The display and control software internally adjusts the scanning interval to 2.5mm. This instruction is then sent to the signal acquisition and processing module, which adjusts the scanning interval to the mechanical scanning interval. During imaging, the device uses electronic scanning in the field of view height direction, scanning from the first antenna to the last antenna one by one to acquire target height direction information. Electronic scanning is extremely fast, and the time consumed is negligible in the entire imaging process. Mechanical scanning is used in the field of view width direction, relying on a uniformly moving conveyor belt to move the target across the field of view width direction to acquire target width direction information. If the actual movement speed of the conveyor belt is 0.6m / s, the mechanical scanning time interval is (2.5mm) / (0.6m / s)=4.17ms, which can adapt to the 500mm field of view width. This method will improve the spatial resolution in the direction of the field of view width, but the amount of raw data will be inconvenient. Through the configuration of the display and control software, the scanning interval can also be kept unchanged, and the number of scanning sectors can be adjusted to 125. This method will not change the spatial resolution in the direction of the field of view width, but will reduce the amount of raw data and lower the hardware requirements of the workstation.

[0046] The depth of field of view of 500mm is less than the maximum depth of field of view of 1000mm. The maximum frequency sampling points are adjusted to 20 within the display and control software to adapt to the depth of field of 500mm. The device of the present invention operates within the electromagnetic frequency band of 24GHz to 30GHz, that is, the antenna transmitting unit emits electromagnetic waves of 24GHz to 30GHz to irradiate the target, and the antenna receiving unit receives the electromagnetic waves reflected by the target to reconstruct the target image. Since the antenna cannot emit continuous waves, but in the form of frequency step scanning, when the maximum frequency sampling points are set to 20, the system's frequency sweep interval is (30GHz-24GHz) / 20=0.3GHz, that is, the sampling frequency points of the device are 24GHz, 24.03GHz, 24.06GHz...29.7GHz, 30GHz.

[0047] When the field of view is larger than the factory preset field of view, the adjustment method is similar and will not be described here.

[0048] The above implementation process only requires manual input of the detected packaging box dimensions and does not require any other human intervention.

[0049] The above description is merely a preferred embodiment of the present invention and is intended to be illustrative rather than restrictive of the present invention. Those skilled in the art will appreciate that many changes, modifications, and even equivalents may be made to the present invention within the spirit and scope of the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A real-time online detection device for millimeter-wave box stripe defects with adjustable field of view, characterized by: It includes a microwave transceiver alarm front end and a central display and control cabinet, which are connected to each other via a cable; the microwave transceiver alarm front end includes an antenna feed component; the antenna feed component generates a three-dimensional field of view of a millimeter wave signal, and the range of the three-dimensional field of view of the millimeter wave signal has an adjustment function; the central display and control cabinet is installed with display and control software that controls the operation of the microwave transceiver alarm front end, and the display and control software has a control module for adjusting the range of the three-dimensional field of view of the millimeter wave signal; There are two groups of antenna feed assemblies, each comprising a transmitting horn antenna and a receiving horn antenna, wherein the horn openings of the transmitting horn antenna and the receiving horn antenna both face the conveyor; The dimensions of each dimension of the millimeter wave signal three-dimensional field of view are: field of view height Equal to the receiving antenna Array height, i.e. , in the above formula, is the interval between the two channels of the receiving antenna, is the number of receiving antennas; Field of view width Equal to the millimeter wave antenna scanning interval transmitted to the direction of motion and the number of sampling sectors The product of ; Depth of field Equal to the maximum unambiguous distance of the distance dimension of the millimeter wave box missing device, that is , where c is the speed of light, B is the operating frequency bandwidth of the device, N f The number of frequency sampling points within the frequency bandwidth; The microwave transceiver alarm front end also includes two supporting legs and a U-shaped shell; the two supporting legs are respectively installed on the bottom of both sides of the U-shaped shell, and the two sets of antenna feed components are symmetrically and vertically installed on both sides of the U-shaped shell; The frequency band of the millimeter wave signal emitted by the transmitting horn antenna can be any one of the K, Ka, and E bands; The U-shaped housing is provided with an audible and visual alarm module and a photoelectric trigger module.

2. The real-time online detection device for millimeter-wave box stripe defects with adjustable field of view according to claim 1 is characterized in that: The antenna feed components are distributed in a full array or sparse array manner.

3. The real-time online detection device for millimeter-wave box stripe defects with adjustable field of view according to claim 1, characterized in that: The central display and control cabinet includes a cabinet body, an agile frequency source, a switch, a signal acquisition and processing module, a workstation, a programmable logic controller and a display; the agile frequency source, the switch, the signal acquisition and processing module, the workstation and the programmable logic controller are all integrated inside the cabinet body, and the display is arranged on the upper side of the cabinet body.

4. The real-time online detection device for millimeter-wave box stripe defects with adjustable field of view according to claim 3 is characterized in that: The agile frequency source is signal-connected to the frequency conversion unit.

5. The real-time online detection device for millimeter-wave box stripe defects with adjustable field of view according to claim 1, characterized in that: Four universal wheels are installed at the bottom of the central display and control cabinet, and the four universal wheels are respectively located at the four corners of the bottom of the central display and control cabinet.

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