Terahertz Radar Image Generation Method And Foreign Matter Identification System Within An Object Using The Same

Abstract

A system for identifying foreign substances within an object using terahertz radar images according to one embodiment of the present disclosure comprises: a transmitting module that emits a terahertz radar signal; a collimator that adjusts the propagation direction of the terahertz radar signal emitted from the transmitting module; a receiving module that receives the terahertz radar signal transmitted through or reflected from a sample; a micro stage connected to the receiving module that controls the position where the receiving module receives the terahertz radar signal; a radar image generating module that generates a plurality of terahertz radar images using the terahertz radar signals received at a plurality of receiving positions and generates a high-resolution terahertz radar image based on the plurality of terahertz radar images; and a foreign substance identification module that identifies foreign substances within the sample using the high-resolution terahertz radar image.

Description

Technology Field

[0001] The present disclosure relates to a method for generating terahertz radar images and a system for identifying foreign substances within an object using the same. Background Technology

[0002] THz radar corresponds to a frequency range of 0.1 to 10 THz in the electromagnetic spectrum, and is located between microwaves and infrared. Additionally, the wavelength range of THz radar can be 30 μm to 3 mm, so THz radar can be the shortest wavelength radio wave and the longest wavelength light wave.

[0003] Therefore, THz radar can simultaneously possess the spatial resolution capability of light waves and the material penetration capability of radio waves. Furthermore, due to its low ionization energy, THz radar has characteristics that make it relatively safe for the human body and may have a unique absorption spectrum.

[0004] As THz spectroscopy and imaging technologies utilizing such material penetration and unique spectra advance, attempts are being made to apply them in various fields such as biology, medicine, and food. In particular, THz radar technology is attracting attention for non-destructively detecting soft materials, such as plastics or insects, which were difficult to identify with existing inspection systems, without altering the state of the object.

[0005] Meanwhile, the resolution of radar images is determined by the number of channels in the radar receiver or the resolution of the radar scanner. However, considering the hardware limitations of the system and the cost of the equipment, there is a need for research on methods to effectively generate high-resolution radar images.

[0006] The aforementioned background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot be considered as prior art disclosed to the general public prior to the filing of the present invention. The problem to be solved

[0007] Some embodiments according to the present disclosure aim to provide a method for generating terahertz radar images and a system for identifying foreign substances within an object using the same. The problems to be solved by the present invention are not limited to those mentioned above, and other problems and advantages of the present invention not mentioned can be understood from the following description and will be more clearly understood by embodiments of the present invention. Furthermore, it will be understood that the problems and advantages to be solved by the present invention can be realized by means and combinations thereof as set forth in the claims. means of solving the problem

[0008] As a technical means for achieving the technical problem described above, the first aspect of the present disclosure may provide a system for identifying foreign substances within an object using terahertz radar images, comprising: a transmitting module that emits a terahertz radar signal; a collimator that adjusts the direction of propagation of the terahertz radar signal emitted from the transmitting module; a receiving module that receives the terahertz radar signal transmitted through or reflected from a sample; a micro stage connected to the receiving module that controls the position where the receiving module receives the terahertz radar signal; a radar image generating module that generates a plurality of terahertz radar images using the terahertz radar signals received at a plurality of receiving positions and generates a high-resolution terahertz radar image based on the plurality of terahertz radar images; and a foreign substance identification module that identifies foreign substances within the sample using the high-resolution terahertz radar image.

[0009] A second aspect of the present disclosure provides a method for generating a terahertz radar image for identifying foreign substances within an object, comprising: generating a first radar image using a first received signal of a terahertz radar received at a first location that passes through or is reflected from a sample; generating a second radar image using a second received signal of the terahertz radar received at a second location spaced apart from the first location by a predetermined distance; and superimposing the first radar image and the second radar image to generate a third radar image of a higher resolution than the first radar image and the second radar image.

[0010] A third aspect of the present disclosure provides a terahertz radar image generating device for identifying foreign substances within an object, comprising: at least one memory; and at least one processor; wherein the processor generates a first radar image using a first received signal of a terahertz radar that passes through or is reflected from a sample, received at a first location; generates a second radar image using a second received signal of the terahertz radar, received at a second location spaced apart from the first location; and superimposes the first radar image and the second radar image to generate a third radar image of a higher resolution than the first radar image and the second radar image.

[0011] A fourth aspect of the present disclosure may provide a computer-readable recording medium having a program for executing a method according to a second aspect on a computer.

[0012] In addition to this, other methods for implementing the present invention, other systems, and computer-readable recording media storing a computer program for executing said methods may be further provided.

[0013] Other aspects, features, and advantages other than those described above will become clear from the following drawings, claims, and detailed description of the invention. Brief explanation of the drawing

[0014] FIG. 1 is a diagram illustrating an example of a system for identifying foreign substances within an object using terahertz radar according to one embodiment. FIG. 2 is a diagram illustrating an example of the internal configuration of a foreign substance identification system within an object using terahertz radar according to one embodiment. FIG. 3 is a diagram illustrating an example of the arrangement of internal components of a foreign substance identification system within an object using a terahertz radar according to one embodiment. FIG. 4 is a diagram illustrating another example of the arrangement of internal components of a foreign substance identification system within an object using a terahertz radar according to one embodiment. FIG. 5 is a flowchart illustrating an example of a method for generating a terahertz radar image for identifying foreign substances within an object according to one embodiment. FIG. 6 is a diagram illustrating an example of a terahertz radar image according to one embodiment. FIG. 7 is a drawing illustrating an example of the internal configuration of a foreign substance identification device within an object using a terahertz radar according to one embodiment. Specific details for implementing the invention

[0015] The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments presented below, but can be implemented in various different forms and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. The embodiments presented below are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. In describing the present invention, detailed descriptions of related known technologies are omitted if it is determined that such detailed descriptions may obscure the essence of the present invention.

[0016] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as “comprising” or “having” are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0017] Some embodiments of the present disclosure may be represented by functional block configurations and various processing steps. Some or all of these functional blocks may be implemented by various numbers of hardware and / or software configurations that execute specific functions. For example, the functional blocks of the present disclosure may be implemented by one or more microprocessors or by circuit configurations for a specific function. Additionally, for example, the functional blocks of the present disclosure may be implemented in various programming or scripting languages. The functional blocks may be implemented as algorithms executed on one or more processors. Furthermore, the present disclosure may employ prior art for electronic configuration, signal processing, and / or data processing, etc. Terms such as “mechanism,” “element,” “means,” and “configuration” may be used broadly and are not limited to mechanical and physical configurations.

[0018] Furthermore, the connecting lines or connecting members between the components depicted in the drawings are merely illustrative of functional connections and / or physical or circuit connections. In the actual device, connections between components may be represented by various alternative or added functional connections, physical connections, or circuit connections.

[0019] Embodiments are described in detail below with reference to the attached drawings. However, embodiments may be implemented in various different forms and are not limited to the examples described herein.

[0020] FIG. 1 is a drawing for explaining an example of a foreign substance identification system within an object using a terahertz radar according to one embodiment, and FIG. 2 is a drawing for explaining an example of an internal configuration of a foreign substance identification system within an object using a terahertz radar according to one embodiment.

[0021] Referring to FIG. 1, a foreign substance identification system (1) (hereinafter referred to as the 'system') using a terahertz radar within an object may be configured to include a terahertz radar device (10) and a sample transport device (30).

[0022] A terahertz radar device (10) can be implemented to include various components for performing the task of identifying foreign substances using terahertz radar with respect to a sample (21)(22), which is an object to be examined for whether foreign substances are included. For example, the terahertz radar device (10) can radiate terahertz radar over the entire sample by scanning the sample (21)(22), and identify foreign substances using radar signals received from the sample (21)(22).

[0023] The sample transport device (30) is a component that transports samples (21)(22). In the present disclosure, the samples may be food samples, bags, carriers, etc. subject to security screening, or products produced in a factory. For example, the sample transport device (30) may be implemented in a form equipped with a conveyor belt, and samples (21)(22) may be placed on the upper part of the conveyor belt and transported in the horizontal axis direction of the sample transport device (30). At this time, the terahertz radar device (10) may transmit terahertz radar (or terahertz waves) to the upper part of the object being transported on the upper part of the conveyor belt. For example, the samples may be transported from the location of the first sample (21) to the location of the second sample (22) and undergo inspection for the presence of foreign substances.

[0024] According to one embodiment of the present disclosure, a foreign substance identification system (200) (hereinafter referred to as the 'system') within a terahertz radar device (10) or a terahertz radar-using object may include a transmitting module (210), a chopper (220), a circulator (230), a collimator (240), a receiving module (250), a micro stage (260), a radar image generation module (270), and a foreign substance identification module (280). Each component will be described in detail below.

[0025] The transmitting module (210) is a component that generates and supplies a terahertz radar signal and can be replaced with various terms such as a terahertz radar (terahertz wave) light source, a terahertz radar (terahertz wave) source, etc. Here, terahertz wave refers to electromagnetic waves in the terahertz region, and preferably may have a frequency of 0.1 THz to 10 THz. However, it is understood that even if it falls outside this range, a region that does not deviate significantly from it may be recognized as a terahertz wave in the present disclosure.

[0026] A collimator (240) is a component that adjusts the direction of propagation of a terahertz radar signal emitted from a transmitting module. For example, the collimator (240) can make the incident radar signal into a parallel signal and reflect it. By doing so, the collimator (240) can improve directionality and reduce noise by generating a parallel radar signal and reflecting it toward a target (e.g., a sample or receiving module). For example, the collimator (240) can be constructed using a lens or a mirror.

[0027] The receiving module (250) is a component that collects and detects terahertz radar incident on a sample. For example, the receiving module (250) can receive terahertz radar signals that pass through the sample (21)(22) or are reflected from the sample. The position at which the receiving module (250) receives the terahertz radar signal can be changed by the microstage (260) described later. For example, the receiving module (250) can be implemented as a radar receiver, a radar scanner, etc.

[0028] The microstage (260) is connected (or coupled) to the receiving module (250) and can control the location where the receiving module (250) receives the terahertz radar signal.

[0029] For example, the microstage (260) can control the linear movement of the receiving module (250). That is, the receiving module (250) can receive terahertz radar signals while moving linearly in a certain direction by the microstage (260). In addition, the receiving module (250) can receive multiple terahertz radar signals at multiple receiving positions located on a single straight line while moving linearly by the microstage (260).

[0030] According to one embodiment, the microstage (260) can control the receiving positions of the receiving module (250) so that the receiving module (250) receives multiple terahertz radar signals at multiple receiving positions spaced apart by a certain distance while the receiving module (250) moves linearly.

[0031] The chopper (220) can adjust the period of the radar signal emitted from the transmitting module (210). For example, the chopper (220) can adjust the period of the radar signal emitted from the transmitting module (210) to be the same as the movement period of the microstage (260). That is, the chopper (220) can time-divide the radar signal emitted from the transmitting module (210) and adjust the period of the radar signal so that the same signal can be received whenever the receiving module (250) moves to a plurality of receiving positions by the microstage (260). For example, when the receiving module (250), which receives the radar signal while moving linearly by the microstage (260), receives the radar signal at a first position and a second position, the receiving signal at the first position and the receiving signal at the second position may have the same phasor. Meanwhile, the chopper (220) can be implemented in the form of either a rotary chopper or a shutter chopper, and in addition, depending on the signal processing method of the radar system, it can be implemented in the form of an electronic chopper, an optical chopper, etc.

[0032] The radar image generation module (270) can generate a radar image using a terahertz radar signal received by the receiving module (250). For example, the radar image generation module (270) may be configured to include an amplifier (not shown), an AD converter (not shown), and a signal processing module (not shown). The radar signal received by the receiving module (250) may be amplified through the amplifier, then converted into a digital signal by the AD converter and transmitted to the signal processing module. The signal processing module can generate a two-dimensional radar image by converting the transmitted signal into pixel values ​​corresponding to image (or image) coordinates through software.

[0033] According to one embodiment of the present disclosure, a radar image generation module (270) can generate a plurality of radar images using a plurality of radar signals received at a plurality of receiving locations by a receiving module (250). In other words, the radar image generation module (270) can generate a radar image based on the received radar signal whenever the location where the receiving module (250) receives the radar signal is changed by the microstage (260).

[0034] The foreign substance identification module (280) can identify foreign substances contained in the sample based on a two-dimensional radar image.

[0035] For example, the foreign substance identification module (280) can determine the boundary point between the area containing foreign substances and the area not containing foreign substances within the sample based on the radar image, and thereby identify the foreign substances contained in the sample.

[0036] As another example, the foreign substance identification module (280) inputs the radar image into a pre-trained deep learning model using the radar image, and can obtain identification results for foreign substances included in the sample as output data of the deep learning model. Here, the deep learning model may be composed of an input layer, a hidden layer, and an output layer, and each layer may be composed of multiple neurons. In addition, each neuron can calculate an output value by applying a value obtained by multiplying the input value by a weight to an activation function, and each layer transmits a signal to the next layer, and the signal can be controlled through weights and biases. That is, the deep learning model optimizes weights and biases using training data, and thereby can learn complex relationships between input and output. Meanwhile, the deep learning model can be implemented as various types of models such as a Multi-Layer Perceptron (MLP), a Convolutional Neural Network (CNN), and a Recurrent Neural Network (RNN). For example, a deep learning model can be trained to classify whether foreign substances are included or to classify foreign substances included in a sample using radar images as training data. Once trained, the deep learning model can take radar images as input data and output the identification results of foreign substances included in the sample as output data.

[0037] Meanwhile, in identifying foreign substances within a sample, the quality of the radar image (e.g., resolution) can be an important factor. To this end, the present disclosure describes in detail, with reference to FIGS. 5 and 6, a method for generating a high-resolution radar image in which foreign substances can be clearly identified.

[0038] FIG. 3 is a drawing for explaining one example of the arrangement of internal components of a foreign substance identification system within an object using a terahertz radar according to one embodiment, and FIG. 4 is a drawing for explaining another example of the arrangement of internal components of a foreign substance identification system within an object using a terahertz radar according to one embodiment.

[0039] More specifically, FIG. 3 corresponds to a transmissive foreign object identification system using a terahertz radar signal transmitted through a sample, and FIG. 4 corresponds to a reflective foreign object identification system using a terahertz radar signal reflected from a sample. Below, the arrangement of the internal components of each system will be described.

[0040] Referring to FIG. 3, a transparent system (300) according to one embodiment may include a transmitting module (310), a chopper (320), a collimator (330), a receiving module (350), a microstage (360), a radar image generation module (370), and a foreign substance identification module (380). The placement positions or order of each component shown in FIG. 3 are shown for convenience of explanation based on the process of processing radar signals and are not limited thereto. For example, the transmitting module (310), the chopper (320), and the collimator (330) may be placed at the same location on top of the sample (340), and the radar image generation module (370) and the foreign substance identification module (380) may also be placed on top of the sample (340).

[0041] In the case of a transmissive system (300), a collimator (330) may be installed between the transmission module (310) and the sample (340). Additionally, a chopper (320) may be installed in front of the transmission module (310).

[0042] For example, the collimator (330) can adjust the direction of propagation of the terahertz radar signal emitted from the transmitting module (310) and direct it toward the sample (340). More specifically, the collimator (330) can receive the radar signal emitted from the transmitting module (310) and whose signal period has been adjusted by the chopper (320), make it into a parallel radar signal, and direct the radar signal toward the sample (340) by reflecting it toward the sample (340).

[0043] Here, the signal irradiated by the sample (340) can pass through the sample (340) and be received by the receiving module (350). In other words, the radar signal irradiated by the collimator (330) into the sample (340) can be a signal that passes through the sample (340).

[0044] A receiving module (350) is positioned at the bottom of a sample (340) and can receive a radar signal that has passed through the sample (340). Additionally, a microstage (360) connected to the receiving module (350) can control the position where the receiving module (350) receives the transmitted signal, and accordingly, the receiving module (350) can receive the transmitted signal at multiple receiving positions.

[0045] The radar image generation module (340) can generate multiple radar images using transmitted signals from multiple receiving positions. Additionally, the radar image generation module (340) can generate a high-resolution radar image by superimposing multiple images.

[0046] The foreign substance identification module (380) can identify foreign substances within an object using a generated high-resolution radar image.

[0047] Referring to FIG. 4, a reflective system (400) according to one embodiment may include a transmitting module (410), a chopper (420), a collimator (441) (442), a receiving module (460), a microstage (470), a radar image generating module (480), and a foreign object identification module (480). Additionally, according to one embodiment, the system (400) may further include a circulator (430).

[0048] Meanwhile, the placement positions or order of each component shown in FIG. 4 are shown for convenience of explanation based on the process of processing radar signals and are not limited thereto. For example, the transmitting module (410), chopper (420), circulator (430), and collimator (441) may be placed at the same location on the top of the sample (450).

[0049] In the case of a reflective system (400), a collimator (441) (442) may be installed at least one of the positions between the transmission module (410) and the sample (450) and the bottom of the sample (340).

[0050] Additionally, a chopper (420) may be installed in front of the transmission module (410), and a circulator (430) may be installed between the transmission module (410) and the sample (450).

[0051] Here, the circulator (430) can separate the radar signal (transmission signal) emitted from the transmission module (410) and the reception signal reflected from the sample (450) received by the reception module (460). In other words, in the reflective system (400), since the reception module (460) is positioned at the top of the sample (450) to receive the radar signal reflected from the sample (450), mutual interference may occur between the transmission signal and the reception signal. To block mutual interference between the transmission signal and the reception signal, the reflective system (400) may further include a circulator (430). Meanwhile, referring to FIG. 4, the angle formed when the transmission signal and the reception signal are incident on or reflected from the sample (450), respectively, is not depicted as being 90 degrees, but this is for distinguishing between the transmission signal and the reception signal and is not limited thereto. Preferably, the transmitted signal will be incident at a 90-degree angle toward the sample (450), and the received signal will be reflected from the sample (450) at a 90-degree angle.

[0052] Meanwhile, the collimator (441) installed between the transmitting module (410) and the sample (450) can adjust the direction of propagation of the terahertz radar signal emitted from the transmitting module (410) and direct it toward the sample (450), as described above in FIG. 3. For example, the collimator (441) can receive the radar signal emitted from the transmitting module (410) and whose signal period is adjusted by the chopper (420), make it into a parallel radar signal, and direct the radar signal toward the sample (450) by reflecting it toward the sample (450).

[0053] Additionally, a collimator (442) installed at the bottom of the sample (450) can irradiate a terahertz radar signal emitted from a transmitting module (410) to a receiving module (460). For example, the collimator (442) can receive a radar signal reflected from the sample (450), convert it into a parallel radar signal, and irradiate the radar signal to the receiving module (460) by reflecting it toward the receiving module (460). Here, the radar signal incident on the collimator (442) may include a radar signal reflected from the surface of the sample (460) or a radar signal reflected from the bottom of the sample (460) after passing through the sample (460). In other words, the radar signal irradiated by the collimator (442) may be a signal reflected from the sample (460).

[0054] A receiving module (460) is positioned at the top of a sample (450) and can receive a radar signal reflected from the sample (460). Additionally, a microstage (470) connected to the receiving module (460) can control the location where the receiving module (460) receives the reflected signal, and accordingly, the receiving module (460) can receive the reflected signal at multiple receiving locations.

[0055] The radar image generation module (480) can generate multiple radar images using reflected signals from multiple receiving positions. Additionally, the radar image generation module (480) can generate a high-resolution radar image by overlapping multiple images.

[0056] The foreign substance identification module (490) can identify foreign substances within an object using a generated high-resolution radar image.

[0057] FIG. 5 is a flowchart illustrating an example of a method for generating a terahertz radar image for identifying foreign substances within an object according to one embodiment, and FIG. 6 is a diagram illustrating an example of a terahertz radar image according to one embodiment.

[0058] Referring to FIG. 5, the terahertz radar image generation method may include steps 510 to 550. However, with reference to FIG. 1 to 4, at least some of the operations described as being performed by components included in the system (200)(300)(400) may be included in the terahertz radar image generation method.

[0059] First, in step 510, a terahertz radar image generating device (or radar image generating module (270)) can generate a first radar image using a first received signal of a terahertz radar that is transmitted through or reflected from a sample, received at a first location.

[0060] More specifically, the transmitting module (210) can emit a terahertz radar signal, and the collimator (240) can adjust the direction of travel of the terahertz radar signal emitted from the transmitting module (210).

[0061] Additionally, the microstage (260) can control the receiving position of the receiving module (250) so that the receiving module (250) receives a terahertz radar signal at a first position, and the receiving module (250) can receive a terahertz radar signal that is emitted from the transmitting module (210) and whose direction of travel is adjusted by the collimator (240) at the first position, which is transmitted through the sample or reflected from the sample.

[0062] Subsequently, the terahertz radar image generating device (or radar image generating module (270)) can generate a first radar image (610) using a first received signal of the terahertz radar that is transmitted through or reflected from the sample, received at a first location.

[0063] In step 530, the terahertz radar image generating device (or radar image generating module (270)) can generate a second radar image using a second received signal of the terahertz radar received at a second location separated by a predetermined distance from the first location.

[0064] More specifically, the microstage (260) can change the receiving position of the receiving module (250) from the first position to the second position so that the receiving module (250) receives a terahertz radar signal at the second position.

[0065] The collimator (240) can adjust the direction of propagation of the terahertz radar signal emitted from the transmitting module (210) in correspondence with the changed receiving position of the receiving module (250).

[0066] Through this, the receiving module (250) can receive the terahertz radar signal emitted from the transmitting module (210) and adjusted in direction by the collimator (240) at a second location, which is transmitted through the sample or reflected from the sample.

[0067] At this time, the chopper (220) can block the radar signal emitted from the transmitting module (210) from penetrating or reflecting from the sample while the receiving position of the receiving module (250) is changed by the microstage (260). Additionally, the chopper (220) can adjust the period of the radar signal emitted from the transmitting module (210) so that the period of the radar signal received by the receiving module (250) at the first position and the period of the radar signal received at the second position are the same.

[0068] Meanwhile, as described above, the second position may refer to a position located at a predetermined distance interval from the first position. Here, the predetermined distance interval may be determined based on the target resolution of the high-resolution radar image that the radar image generating device intends to generate. For example, the predetermined distance interval may be a value smaller than the distance interval between pixels of the first radar image (or the second radar image). Accordingly, any one pixel of the first radar image may overlap with at least one pixel of the second radar image. The smaller the predetermined distance interval, the more pixels of the first radar image may overlap with a large number of pixels of the second radar image. In other words, the higher the target resolution of the high-resolution radar image that the device intends to generate, the smaller the predetermined distance interval may be determined to be.

[0069] Afterward, the terahertz radar image generating device (or radar image generating module (270)) can generate a second radar image using a second received signal of the terahertz radar that is transmitted through or reflected from the sample, received at a second location.

[0070] According to one embodiment, a terahertz radar image generating device (or radar image generating module (270)) can generate a plurality of first-direction radar images using a plurality of received signals of a terahertz radar received at a plurality of locations spaced apart by a certain distance while the receiving module (250) moves linearly in a first direction.

[0071] Additionally, the terahertz radar image generating device (or radar image generating module (270)) can generate multiple second-direction radar images using multiple received signals of terahertz radar received at multiple locations spaced apart by a certain distance while the receiving module (250) moves linearly in the second direction.

[0072] Here, compared to the first direction, the second direction may mean the exact opposite direction. For example, if the first direction is a direction facing one side with respect to the horizontal axis (x-axis), the second direction may mean the other direction of the horizontal axis. As another example, if the first direction is a direction facing one side with respect to the vertical axis (y-axis), the second direction may mean the other direction of the vertical axis.

[0073] For example, when the receiving module (250) moves linearly in a first direction (e.g., to the right of the horizontal axis) by the microstage (260), the receiving module (250) can receive radar signals at a seconda position, a thirda position, a fourtha position, etc. At this time, the distance intervals between multiple positions including the first position, the seconda position, and the thirda position, etc., may all be the same. Additionally, the radar image generation module (270) can generate multiple first-direction radar images using the received signals received at each position.

[0074] Additionally, when the receiving module (250) moves linearly in a second direction (e.g., to the left of the horizontal axis) by the microstage (260), the receiving module (250) can receive radar signals at a second position, a third position, a fourth position, etc. Likewise, the distance intervals between multiple positions including a first position, a second position, a third position, and a fourth position, etc., can all be the same. Additionally, the radar image generation module (270) can generate multiple second-direction radar images using the received signals received at each position.

[0075] To summarize, the second radar image may include a plurality of first direction radar images (620) and a plurality of second direction radar images (630). Meanwhile, the distance interval between the plurality of first direction radar images (620) and the distance interval between the plurality of second direction radar images (630) shown in FIG. 6 are expressed larger than the pixels of the image for convenience of explanation, and the actual predetermined distance interval may be a value smaller than the distance interval between pixels of the first radar image (or second radar image) as described above.

[0076] Referring again to FIG. 5, in step 550, a terahertz radar image generating device (or radar image generating module (270)) can superimpose a first radar image and a second radar image to generate a third radar image (640) with a higher resolution than the first radar image and the second radar image.

[0077] For example, a terahertz radar image generating device (or radar image generating module (270)) can divide a first radar image into multiple pixels. Additionally, the terahertz radar image generating device (or radar image generating module (270)) can overlap any one pixel of the first radar image with multiple pixels included in multiple second radar images. Through this, the terahertz radar image generating device (or radar image generating module (270)) can generate a third radar image (640) with a higher resolution than the first radar image by using multiple second radar images.

[0078] FIG. 7 is a drawing for explaining an example of the internal configuration of a terahertz radar image generating device (hereinafter referred to as the 'device') according to one embodiment.

[0079] Referring to FIG. 7, the device (700) may include a processor (710), memory (720), an input / output interface (730), and a communication module (740). For convenience of explanation, FIG. 7 only illustrates components related to the present invention. Accordingly, other general-purpose components may be included in the device (700) in addition to the components illustrated in FIG. 7. Furthermore, it is obvious to those skilled in the art that the processor (710), memory (720), input / output interface (730), and communication module (740) illustrated in FIG. 7 may be implemented as independent devices.

[0080] The processor (710) can process instructions of a computer program by performing basic arithmetic, logic, and input / output operations. Here, the instructions may be provided from memory (720) or an external device. Additionally, the processor (710) can control the overall operation of other components included in the device (700).

[0081] The processor (710) can generate a first radar image using a first received signal of a terahertz radar that is transmitted through or reflected from a sample, received at a first location.

[0082] The processor (710) can generate a second radar image using a second received signal of a terahertz radar received at a second location separated by a predetermined distance from the first location.

[0083] For example, the processor (710) can generate multiple first-direction radar images using multiple received signals of a terahertz radar received at multiple locations spaced apart by a certain distance while the receiving module moves linearly in a first direction. Additionally, the processor (710) can generate multiple second-direction radar images using multiple received signals of a terahertz radar received at multiple locations spaced apart by a certain distance while the receiving module moves linearly in a second direction. Here, the distance interval can be determined based on the target resolution of the third radar image of high resolution.

[0084] The processor (710) can superimpose the first radar image and the second radar image to generate a third radar image with a higher resolution than the first radar image and the second radar image.

[0085] In addition, the processor (710) may perform at least some of the operations described as being performed by the radar image generation module with reference to FIGS. 1 through 6.

[0086] The processor (710) may be implemented as an array of multiple logic gates, or as a combination of a general-purpose microprocessor and memory storing a program that can be executed on the microprocessor. For example, the processor (710) may include a general-purpose processor, a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a controller, a microcontroller, a state machine, etc. In some environments, the processor (710) may include an application-specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. For example, the processor (710) may refer to a combination of processing devices such as a combination of a digital signal processor (DSP) and a microprocessor, a combination of multiple microprocessors, a combination of one or more microprocessors combined with a digital signal processor (DSP) core, or any other combination of such configurations.

[0087] The memory (720) may include any non-transient computer-readable recording medium. As an example, the memory (720) may include a non-perishable permanent mass storage device such as RAM (random access memory), ROM (read only memory), disk drive, SSD (solid state drive), flash memory, etc. As another example, a non-perishable permanent mass storage device such as ROM, SSD, flash memory, disk drive, etc. may be a separate permanent storage device distinct from the memory. Additionally, the memory (720) may store an operating system (OS) and at least one program code (e.g., code for the processor (710) to perform the operation described above with reference to FIGS. 1 through 6).

[0088] These software components may be loaded from a computer-readable recording medium separate from the memory (720). This separate computer-readable recording medium may be a recording medium that can be directly connected to the device (700) and may include, for example, a computer-readable recording medium such as a floppy drive, disk, tape, DVD / CD-ROM drive, memory card, etc. Alternatively, the software components may be loaded into the memory (720) via a communication module (740) that is not a computer-readable recording medium. For example, at least one program may be loaded into the memory (720) based on a computer program (e.g., a computer program for the processor (710) to perform the operation described above with reference to FIGS. 2 through 6) which is installed by files provided through the communication module (740) by developers or a file distribution system that distributes installation files for applications.

[0089] The input / output interface (730) may be a means for interfacing with a device for input or output (e.g., keyboard, mouse, etc.) that may be connected to or included in the device (700). In FIG. 7, the input / output interface (730) is shown as an element configured separately from the processor (710), but is not limited thereto, and the input / output interface (730) may be configured to be included in the processor (710).

[0090] The communication module (740) may provide a configuration or function for the device (700) to communicate with an external device through a network. Additionally, the communication module (740) may provide a configuration or function for the device (700) to communicate with another external device. For example, control signals, commands, data, etc. provided under the control of the processor (710) may be transmitted to an external device via the communication module (740) and the network.

[0091] Meanwhile, although not illustrated in FIG. 7, the device (700) may further include a display device. Alternatively, the device (700) may be connected to an independent display device via wired or wireless communication to transmit and receive data to and from each other.

[0092] Unless explicitly stated or contrary to the order of the steps constituting the method according to the present invention, said steps may be performed in a suitable order. The present invention is not necessarily limited by the order in which said steps are described. The use of all examples or exemplary terms (e.g., etc.) in the present invention is merely for the purpose of describing the present invention in detail, and the scope of the present invention is not limited by said examples or exemplary terms unless limited by the claims. Furthermore, those skilled in the art will understand that various modifications, combinations, and changes may be made according to design conditions and factors within the scope of the claims or equivalents to which they are added.

[0093] Accordingly, the scope of the present invention should not be limited to the embodiments described above, and all scopes equivalent to or equivalently modified from the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention.

Claims

Claim 1 A system for identifying foreign substances within an object using terahertz radar images, comprising: a transmitting module that emits a terahertz radar signal; a collimator that adjusts the propagation direction of the terahertz radar signal emitted from the transmitting module; a receiving module that receives the terahertz radar signal transmitted through or reflected from a sample; a micro stage connected to the receiving module that controls the position where the receiving module receives the terahertz radar signal; a radar image generation module that generates a plurality of terahertz radar images using the terahertz radar signals received at a plurality of receiving positions and generates a high-resolution terahertz radar image based on the plurality of terahertz radar images; and a foreign substance identification module that identifies foreign substances within the sample using the high-resolution terahertz radar image. A system comprising, wherein the microstage controls the receiving positions of the receiving module so that the receiving module receives the terahertz radar signal at a plurality of receiving positions spaced apart by a certain distance while the receiving module moves linearly, and the distance interval is determined based on the target resolution regarding the high-resolution terahertz radar image. Claim 2 A system according to claim 1, wherein the collimator is installed between the transmitting module and the sample and irradiates the sample with the terahertz radar signal emitted from the transmitting module. Claim 3 In claim 2, the terahertz radar signal investigated by the sample is received by the receiving module after passing through the sample. Claim 4 A system according to claim 1, wherein the collimator is installed at the bottom of the sample and irradiates the terahertz radar signal emitted from the transmitting module to the receiving module. Claim 5 In claim 4, the terahertz radar signal investigated by the receiving module is reflected from the sample and received by the receiving module, in a system. Claim 6 In claim 4, the system further comprises a circulator that separates a transmission signal emitted from the transmission module and a reception signal reflected from the sample received by the reception module. Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 The system of claim 1 further comprises a chopper that adjusts the period of the terahertz radar signal emitted from the transmitting module to be the same as the movement period of the microstage. Claim 11 A system according to claim 1, wherein the radar image generation module generates a first radar image using a first received signal of a terahertz radar that is transmitted through or reflected from the sample, received at a first location, generates a second radar image using a second received signal of the terahertz radar, received at a second location separated by a predetermined distance from the first location, and superimposes the first radar image and the second radar image to generate a third radar image of higher resolution than the first radar image and the second radar image. Claim 12 A system according to claim 11, wherein the second radar image comprises a plurality of first directional radar images generated using a plurality of received signals of the terahertz radar received at a plurality of locations spaced apart by a certain distance while the receiving module moves linearly in a first direction, and a plurality of second directional radar images generated using a plurality of received signals of the terahertz radar received at a plurality of locations spaced apart by a certain distance while the receiving module moves linearly in a second direction. Claim 13 A method for generating a terahertz radar image to identify foreign substances within an object, comprising: generating a first radar image using a first received signal of a terahertz radar received at a first location that passes through or is reflected from a sample; generating a second radar image using a second received signal of the terahertz radar received at a second location separated by a predetermined distance from the first location; and superimposing the first radar image and the second radar image to generate a third radar image with a higher resolution than the first radar image and the second radar image, wherein the distance interval is determined based on a target resolution regarding the high-resolution third radar image. Claim 14 delete Claim 15 In claim 13, the step of generating the second radar image comprises: generating a plurality of first-direction radar images using a plurality of received signals of the terahertz radar received at a plurality of locations spaced apart by a certain distance while the receiving module moves linearly in a first direction; and generating a plurality of second-direction radar images using a plurality of received signals of the terahertz radar received at a plurality of locations spaced apart by a certain distance while the receiving module moves linearly in a second direction. Claim 16 A computer-readable recording medium having a program for executing the method of paragraph 13 on a computer.

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