CN113777072B - Apparatus, system, method, medium, and program product for detecting terahertz signal - Google Patents
Apparatus, system, method, medium, and program product for detecting terahertz signal Download PDFInfo
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Abstract
The invention provides a device, a system, a method, a medium and a program product for detecting terahertz signals, which can be applied to the technical field of terahertz detection. The device for detecting the terahertz signal comprises a plurality of filters, wherein at least part of the filters in the plurality of filters are respectively provided with different transmission frequency bands, and the maximum size of the hollow part in the metal hollow structure of at least part of the filters is positively correlated with the central frequency band and the frequency band bandwidth of the transmission frequency band; a detector including an antenna configured to receive terahertz waves; and a position adjuster disposed at one side of the antenna and configured to drive the plurality of filters to move to change positions of the plurality of filters; wherein the terahertz signal from the detection object is filtered by the filter aligned with the antenna by changing the position of the plurality of filters such that at least one of the plurality of filters is aligned with the antenna, so that the detector can acquire the terahertz signal corresponding to the filtered terahertz wave.
Description
Technical Field
The present invention relates to the field of terahertz detection technology, and more particularly, to an apparatus, system, method, medium, and program product for detecting terahertz signals.
Background
Terahertz waves refer to electromagnetic waves having an oscillation frequency between 0.1 terahertz (THz) and 10 THz. The terahertz wave has the characteristics of good penetrability, low single photon energy, rich spectral information and the like, and has important application value in the fields of security inspection imaging, spectral detection, information communication and the like.
In the related art, a single-band imaging technology based on terahertz waves or a multi-band imaging technology based on terahertz waves can be adopted to meet the requirements of application scenes such as safety detection. However, the single-band imaging technology based on terahertz waves cannot acquire frequency information, and the adaptability to different environments cannot meet the user requirements. In the multiband imaging technology based on terahertz waves, each detection frequency band needs to correspond to one type of detector, and with the increase of the detection frequency bands, the hardware cost of the system can be greatly increased, such as the cost of the detectors and the matching circuits thereof, the complexity of the system is increased, and the reliability is reduced.
Disclosure of Invention
In view of the above problems, the present invention provides an apparatus, a system, a method, a medium, and a program product for detecting a terahertz signal, which can reduce hardware cost and improve system reliability on the basis of satisfying the requirement of multiband imaging.
According to a first aspect of the present invention, there is provided an apparatus for detecting a terahertz signal, comprising: the filter comprises a plurality of filters, wherein at least part of the filters are respectively provided with different transmission frequency bands, and the maximum size of the hollow parts in the respective metal hollow structures of at least part of the filters is positively correlated with the central frequency band and the frequency band bandwidth of the transmission frequency band; a detector comprising an antenna configured to receive a terahertz signal; and a position adjuster disposed at one side of the antenna and configured to drive the plurality of filters to move to change positions of the plurality of filters; wherein the terahertz signal from the detection object is filtered by the filter aligned with the antenna by changing the position of the plurality of filters such that at least one of the plurality of filters is aligned with the antenna, so that the detector can acquire the terahertz signal corresponding to the filtered terahertz wave.
In some embodiments of the present invention, the position adjuster includes a rotating member, and the plurality of filters are respectively disposed at regions corresponding to the plurality of angular ranges on the rotating member; and/or the position adjuster includes a translation member, and the plurality of filters are respectively disposed at regions on the translation member corresponding to the plurality of position ranges.
In some embodiments of the invention, the rotating component comprises: a support portion intersecting with an axis around which the rotating member rotates; and the plurality of hollowed-out parts are positioned on one side, far away from the axis, of the supporting part, the plurality of hollowed-out parts are respectively positioned in the areas, corresponding to the plurality of angle ranges, of the rotating part, and at least part of the hollowed-out parts are provided with the filter.
In some embodiments of the invention, the filter comprises a dielectric substrate, and a metal hollow structure with a first specified thickness, which is located on the surface of the dielectric substrate; and/or the filter comprises a metal hollow structure with a second specified thickness, wherein the second specified thickness is larger than the first specified thickness.
In some embodiments of the invention, the filter further comprises at least one of: the first dielectric lens is arranged on one side, far away from the dielectric substrate, of the metal hollow structure with the first specified thickness; the second dielectric lens is arranged on one side, far away from the metal hollow structure with the first designated thickness, of the dielectric substrate; or the third dielectric lens is arranged on one side of the metal hollow structure with the second specified thickness.
In some embodiments of the present invention, a maximum size of the hollow portion in the metal hollow structure is directly related to a center frequency band and a frequency band bandwidth of the transmission frequency band.
In some embodiments of the present invention, the hollow portion of the metal hollow structure includes a cross-shaped hollow shape, a maximum cross-sectional size of the cross-shaped hollow shape is positively correlated with a central frequency band of the transmission frequency band, and a width of the protruding portion of the cross-shaped hollow shape is positively correlated with a frequency band bandwidth of the transmission frequency band.
In some embodiments of the invention, the filter comprises a band pass filter and/or a band stop filter; and the metal hollow structure is aligned with the antenna and corresponds to the filter, and the projection of the plane where the antenna is located covers the antenna.
In some embodiments of the invention, the apparatus further comprises: and the power source, a movable part of the power source is configured to drive the position regulator to move, and the position and/or the angle of the movable part have corresponding relation with the transmission frequency band.
In some embodiments of the invention, the antenna comprises a helical antenna, a first width of an end of the helical antenna distal from a center of the helical antenna being greater than a second width of an end of the helical antenna proximal to the center of the helical antenna.
A second aspect of the present invention provides a system for detecting a terahertz signal, including: the device for detecting terahertz signals as above; a position determining device configured to determine positions of the plurality of filters; a processor electrically connected to the position determining device and the detector, respectively; the detector further comprises a sensing unit electrically connected with the antenna, the sensing unit being configured to convert the filtered terahertz waves from the antenna into terahertz signals; wherein the processor is configured to determine a transmission band based on the positions of the plurality of filters from the position determination device, and derive a detection signal based on the transmission band and the terahertz signal from the detector.
In some embodiments of the invention, the system further comprises: the bias readout circuit is electrically connected with the output end of the detector at the input end and is configured to amplify the terahertz signal from the detector; and the input end of the analog-to-digital conversion circuit is electrically connected with the output end of the bias readout circuit, the analog-to-digital conversion circuit is configured to sample the amplified terahertz signal, and the sampling information is sent to the processor, so that the processor can perform at least one function of multi-band terahertz image fusion or substance identification based on the sampling information.
In some embodiments of the invention, the system further comprises: a power source including a motor, a rotational speed and a rotational angle of a rotating portion of the motor being related to at least one of: the response speed of the detector, the lobe width of the detector, the distribution mode of the plurality of filters in the position regulator, the transmission frequency bands of the plurality of filters or the number of the filters.
A third aspect of the present invention provides a method for detecting a terahertz signal, which is applied to the above apparatus or applied to the above system, and the method includes: the position adjuster is controlled to move to change the positions of the plurality of filters such that at least one of the plurality of filters is aligned with the antenna to filter the terahertz signal from the detection object by the filter aligned with the antenna, so that the detector can acquire the terahertz signal corresponding to the filtered terahertz wave.
In some embodiments of the invention, the method further comprises: determining a transmission spectrum of a filter aligned to the antenna; and fusing the transmission spectrum and the terahertz signal corresponding to the filtered terahertz wave to obtain the terahertz signal of the specified frequency band for the detection object.
In some embodiments of the invention, the method further comprises: imaging is carried out on the terahertz signal of the specified frequency band aiming at the detection object, and a terahertz image of the specified frequency band aiming at the detection object is obtained.
In some embodiments of the invention, the method further comprises: controlling the position regulator to move, so that the plurality of filters are respectively aligned to the antenna at different time intervals to acquire terahertz signals of a plurality of different specified frequency bands aiming at the detection object; imaging terahertz signals of a plurality of different specified frequency bands aiming at a detection object respectively to obtain terahertz images of the plurality of specified frequency bands aiming at the detection object respectively; and fusing terahertz images of the plurality of specified frequency bands aiming at the detection object to obtain a multi-band terahertz fused image aiming at the detection object.
A fourth aspect of the invention provides a non-transitory computer readable medium comprising a computer program product recorded thereon and capable of being run by a processor, the computer program product comprising program code instructions for implementing a method according to the above.
A fifth aspect of the invention provides a computer program product downloadable from a communication network and/or recorded on a medium readable by a computer and/or executable by a processor, the computer program product comprising program code instructions for implementing a method according to the above.
According to the device, the system, the method, the medium and the program product for detecting terahertz signals of the various embodiments of the present invention, a metamaterial filter capable of adjusting a transmission frequency band is formed by using a position adjuster and a plurality of filters having different transmission frequency bands in combination, and then multi-band signal detection is effectively achieved by using the metamaterial filter and a terahertz detector having a wide frequency band in combination.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following description of embodiments of the invention, which proceeds with reference to the accompanying drawings, in which:
fig. 1 schematically shows a schematic view of an apparatus for detecting terahertz signals according to an embodiment of the present invention;
FIG. 2 schematically shows a schematic structural view of a position regulator according to an embodiment of the present invention;
FIG. 3 schematically shows a diagram of a correspondence between transmission frequency and angle according to an embodiment of the invention;
FIG. 4 schematically shows a schematic structural view of a position regulator according to another embodiment of the present invention;
FIG. 5 schematically shows a schematic structural view of a position regulator according to another embodiment of the present invention;
FIG. 6 schematically illustrates a top view of a filter of a position adjuster according to an embodiment of the invention;
FIG. 7 schematically illustrates an A-A' cross-sectional view of a filter of a position adjuster according to an embodiment of the invention;
FIG. 8 schematically shows a schematic microstructure of a filter according to an embodiment of the invention;
FIG. 9 schematically shows a diagram of transmission spectra of filters of different sizes according to an embodiment of the invention;
FIG. 10 schematically shows a schematic structural view of a dielectric lens of a position adjuster according to an embodiment of the present invention;
fig. 11 schematically shows a structural view of an antenna according to an embodiment of the present invention;
fig. 12 schematically shows a schematic view of a system for detecting terahertz signals according to an embodiment of the present invention;
fig. 13 schematically shows a schematic view of a system for detecting terahertz signals according to another embodiment of the present invention;
fig. 14 schematically shows a schematic view of a method of detecting a terahertz signal according to an embodiment of the present invention; and
fig. 15 schematically shows a schematic view of a method of detecting a terahertz signal according to another embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
In the related art, the detection technology based on the terahertz wave may be a technical scheme adopting single-band detection. In order to realize multi-frequency detection, detectors with different detection frequencies can be arranged in the related art, so that the purpose of multi-frequency detection is realized.
However, in the technical solution of single-band imaging detection in the related art, the intensity information of the terahertz wave from the detection object can be acquired, but the frequency information of the terahertz wave is not easily acquired. Therefore, dangerous goods are not easy to classify, and the adaptability of single-frequency-band imaging detection to different environments is poor.
In the related art, in the multi-band imaging technical scheme, each detection band needs to correspond to one type of detector. With the increase of the detection frequency band, the number of detectors also needs to be multiplied, which can greatly increase the hardware (detectors, supporting circuits) cost of the system, so that the complexity of the technical scheme of multi-band imaging is increased and the reliability is reduced.
Embodiments of the present invention provide an apparatus, system, method, medium, and program product for detecting terahertz signals, which realize multi-band signal detection by combining a terahertz detector having a wide frequency band with a metamaterial filter. Wherein the detector used may be a high sensitivity broadband detector. The pose of the metamaterial filter with various frequencies is adjustable, and the filter aligned to the antenna is changed by adjusting the position of the metamaterial filter so as to change the filtering frequency of the aligned antenna, thereby realizing the rapid detection of multi-frequency signals.
Fig. 1 schematically shows a schematic view of an apparatus for detecting a terahertz signal according to an embodiment of the present invention.
Referring to fig. 1 and 6, the apparatus for detecting a terahertz signal may include the following components.
The filter comprises a plurality of filters 10, wherein at least part of the filters 10 in the plurality of filters 10 have different transmission frequency bands, and the maximum size of the hollow parts in the respective metal hollow structures of at least part of the filters 10 is positively correlated with the central frequency band and the frequency band bandwidth of the transmission frequency band.
The detector 20 includes an antenna 21, and the antenna 21 is configured to receive terahertz waves.
The position adjuster 30 is disposed on a side of the antenna 21 close to the detection object, and configured to drive the plurality of filters 10 to move so as to change positions of the plurality of filters 10.
Wherein, by changing the positions of the plurality of filters 10 such that at least one filter 10 of the plurality of filters 10 is aligned with the antenna 21 to filter the terahertz wave from the detection object by the filter 10 aligned with the antenna 21, the detector 20 is enabled to acquire the terahertz signal corresponding to the filtered terahertz wave.
In some embodiments, the filter 10 may be a dielectric substrate metal mesh structure. In addition, the filter 10 may also employ a metal mesh structure without a substrate.
The detector 20 may be a high sensitivity broadband detector (e.g., a superconducting thermal electronic Bolometer (HEB), a superconducting antenna-coupled microbolometer (ACMB), etc.).
The position adjuster 30 may be used to change the position of the filter 10 disposed thereon so as to align the antenna 21 of the detector 20 one by one at different time periods for different filters 10. For example, the position adjuster 30 may be used to drive the filter 10 disposed thereon to at least one of move in a horizontal plane, move perpendicular to a horizontal plane, rotate about an axis (or axes), and the like, to effect a change in the position of the filter 10 disposed on the position adjuster 30.
In some embodiments, the position adjuster 30 includes a rotating member on which the plurality of filters 10 are respectively disposed at regions corresponding to a plurality of angular ranges. Wherein the plurality of angular ranges may be non-overlapping or partially overlapping angular ranges within a range of 0 ° -360 °. For example, the rotating member may include one circular ring region divided into regions corresponding to a plurality of angular ranges. For example, the rotating portion may include a plurality of concentric annular ring regions, each annular ring region being divided into regions corresponding to a plurality of angular ranges, wherein the plurality of angular ranges of different annular rings may each be the same or different. For example, the first annular region may be divided into 4 regions in a 90 ° range, the second annular region may be divided into 6 regions in a 60 ° range, and the third annular region may be divided into 8 regions in a 45 ° range. For example, the first annular region, the second annular region, and the third annular region are each divided into 4 regions in a 90 ° range.
In some embodiments, the rotating component may be of circular configuration and rotate about a center of the circle. Specifically, the rotating member may include: a support portion 31 and a plurality of cutout portions 32.
Fig. 2 schematically shows a structural view of a position regulator according to an embodiment of the present invention.
As shown in fig. 2, the support portion 31 intersects with the axis about which the rotating member rotates. The plurality of hollow parts 32 are located on one side of the supporting part away from the axis, the plurality of hollow parts 32 are respectively located in the areas of the rotating part corresponding to the plurality of angle ranges, and at least part of the hollow parts 32 are provided with the filter 10. The support portion 31 may be driven by a human power, or may be driven by an electric power, and is not limited thereto.
The rotating part shown in fig. 2 comprises a metal disc holder which can be used to hold different frequency filters 10. Wherein the inner diameter of the bracket is R1Outer diameter of R2. The central position is provided with a through hole for connecting with a motor. Wherein the circle with radius within R1 is made of metal material, R1And R2With a through hole left therebetween for fixing the filter 10. In fig. 2, the circular through hole is divided into 4 parts, and each part is provided with a filter 10 with a specified filtering frequency. For example, the transmission frequencies are respectivelyf 1，f 2，f 3，f 4. In practical use, the ring can be divided into more parts according to the situation to realize the placement of more frequency filters 10.
Fig. 3 schematically shows a diagram of the correspondence between transmission frequency and angle according to an embodiment of the present invention.
The correspondence between the rotation angle and the center frequency of the corresponding transmission peak is shown in fig. 3. With the change of the rotation angle, when the rotation angle is within a certain range, the transmission frequency is constant, and the next transmission frequency is entered when the rotation angle is larger than a certain angle. The design of the angle interval needs to be selected by comprehensively considering the factors of the rotating speed of the motor, the response speed of the detector, the lobe width of the detector, the frequency spectrum range of the rotating filter 10, the number of the filters and the like.
As in fig. 3Angle of rotation theta1Corresponding to the transmission frequencyf 1Angle of rotation theta2Corresponding to the transmission frequencyf 2Angle of rotation theta3Corresponding to the transmission frequencyf 3Angle of rotation theta4Corresponding to the transmission frequencyf 4. For example, when the current rotation angle of the metal disc support is detected to be theta2，It can be determined that the current transmission frequency isf 2。
It should be noted that fig. 2 and 3 are merely examples of the structure of the position adjuster 30 to help those skilled in the art understand the technical contents of the present invention, and it is not intended that the embodiment of the present invention may have other structures.
In the embodiment of the invention, the filters 10 with different transmission frequencies are sequentially fixed at different angle positions of a rotating disc to form the rotating filter capable of filtering terahertz waves of different frequency bands. The transmission frequency of the incident terahertz signal is adjusted through the rotation of the disc, so that the multi-frequency signal is rapidly detected.
In some embodiments, the rotating component may also rotate about multiple axes to allow for finer and more extensive tuning of the filter 10.
Fig. 4 schematically shows a structural view of a position regulator according to another embodiment of the present invention.
As shown in fig. 4, the position regulator 30 may include: at least one shaft structure and at least two motors 33. The hinge structure may include at least two hinge arms 311, 312 capable of moving relatively, and the hinge structure is used to support the filter 10. And at least two motors 33 respectively used for driving the corresponding shaft arms to move so as to adjust the posture of the filter 10.
For example, the pitch axis motor and the pitch axis arm cooperate to drive the filter 10 in rotation about the pitch axis. The roll axis motor and roll axis arm cooperate to drive the filter 10 about the roll axis. The yaw axis motor and the yaw axis arm cooperate to drive the filter 10 in rotation about the yaw axis.
The pitching shaft motor can drive the pitching shaft arm to move, the rolling shaft motor can drive the rolling shaft arm to move, and the yawing shaft motor can drive the yawing shaft arm to move. For example, the yaw axis arm may be connected to one end of the roll axis arm and the other end of the roll axis arm may be connected to the pitch axis arm, but the embodiment of the present invention is not limited thereto and the yaw axis arm, the roll axis arm, and the pitch axis arm may be connected in other order.
It should be understood that the position adjuster 30 may also enable the filter 10 to rotate only about one, two, or four axes, etc., and is not limited thereto.
In some embodiments, in order to improve the accuracy of the position of the plurality of filters 10 after the position is changed, a plurality of positioning structures and/or position sensors may be provided on the support portion 31. For example, the locating structure may comprise cooperating projections and recesses. After the in-place sensor outputs the in-place signal, it can be determined that the filter 10 corresponding to the in-place sensor is aligned with the antenna, and the reliability of the acquired signal can be ensured at this time.
In some embodiments, the position adjuster 30 includes a translation member, and the plurality of filters 10 are respectively disposed at regions on the translation member corresponding to the plurality of position ranges.
Fig. 5 schematically shows a structural view of a position regulator according to another embodiment of the present invention.
As shown in fig. 5, the position adjuster 30 may include a bracket on which a plurality of filters 10 may be arranged in an array. For example, one or more rows of filters 10 may be provided on the rack. The carriage may be moved in a given direction by manually or automatically driving the carriage. For example, the carriage may be driven to move in the X-direction or in the Y-direction.
Fig. 6 schematically shows a top view of a filter of a position regulator according to an embodiment of the invention.
As shown in fig. 6, a filter 10 may include a plurality of microstructures 11 arranged in an array. The microstructures 11 may be metal hollow structures, such as "ten" shapes, circles, ellipses, rectangles, squares, "L" shapes, "T" shapes, etc., which are not listed here.
In some embodiments, the filter 10 includes a dielectric substrate, and a metal cutout structure with a first specified thickness on the surface of the dielectric substrate. The filter with the dielectric substrate has a narrow transmission spectrum due to the influence of front and back surface interference and interface reflection of the dielectric substrate. The thickness of the dielectric substrate and the thickness of the metal hollow structure can be determined according to a required transmission spectrum, such as by simulation, calibration and the like. It should be noted that the dielectric substrate can provide a certain protection function for the metal hollow structure, so that the first specified thickness is thinner than that of the metal hollow structure without the dielectric substrate, and the influence of the side surface of the hollow structure on the terahertz signal due to too thick metal thickness is reduced. The combination of the dielectric substrate and the thin metal hollow structure is beneficial to realizing narrower transmission spectrum and smaller signal interference, and the pertinence of the filtered terahertz signal is improved.
Fig. 7 schematically shows an a-a' cross-sectional view of a filter of a position regulator according to an embodiment of the present invention.
As shown in the left diagram of fig. 7, the filter 10 includes a dielectric substrate 111 and a metal layer 112 on one side of the dielectric substrate 111, which are stacked. Materials of the dielectric substrate 111 include, but are not limited to: high resistance silicon materials, organic materials, silicon dioxide materials, silicon nitride materials, and the like. The dielectric substrate 111 needs to provide a supporting force for the metal layer 112 and needs to have a certain thickness. Metal layer 112 may have a first specified thickness h 1.
In some embodiments, as shown in the right diagram of fig. 7, the filter 10 includes a metal cutout structure having a second specified thickness h2, the second specified thickness h2 being greater than the first specified thickness h 1.
As shown in the right diagram of fig. 7, the filter 10 includes a metal layer 112. The metal layer 112 needs to provide sufficient supporting force to itself. The thickness of the metal layer shown in the right drawing is thicker relative to the metal layer shown in the left drawing of fig. 7 due to the lack of support provided by the substrate.
Specifically, the filter 10 may be a dielectric substrate metal mesh structure, and the filter 10 may also adopt a metal mesh structure without a substrate. The metal grid structure of the dielectric substrate can be prepared into a corresponding structural pattern by using a micro-nano processing mode. Since the dielectric substrate 111 has the influence of front and rear surface interference and interface reflection, its transmission spectrum is narrow and the loss to the terahertz wave is also large. Therefore, when the filter 10 is manufactured by using the dielectric substrate 111, a dielectric material with a suitable thickness needs to be selected according to the transmission spectrum of the filter 10 (for example, the thicknesses of the dielectrics of the filters in various transmission frequency bands may be different to improve the filtering effect, but the manufacturing process of the filter is complicated), and the dielectric constant of the dielectric material is as small as possible to reduce the mismatch degree between the dielectric material and the spatial impedance so as to reduce the surface reflection. Since the metal mesh filter has no substrate, there is no interference influence by a medium, and thus the metal mesh filter has high transmittance to a target transmission frequency. In addition, since filters 10 with different filtering frequencies can use metal films with the same thickness, the complexity of multi-frequency filter design (such as designing the thickness of the medium for each transmission band) and manufacturing process is reduced.
The preparation method of the metal grid filter without the substrate mainly comprises three methods of a LIGA (Lithogrphie Galvanoformung) technology, a laser processing technology and a photoetching micron nanometer processing technology. In actual application, factors such as processing cost, processing precision, surface roughness and the like need to be comprehensively considered for selecting the process. Hereinafter, the filter 10 is exemplified by using a metal mesh filter and processing the filter by a laser processing technique.
In some embodiments, the maximum size of the hollow part in the metal hollow structure is positively correlated with the central frequency band and the frequency band bandwidth of the transmission frequency band. For example, the larger the maximum size of the hollow portion is, the higher the center frequency band of the transmission frequency band is, and the wider the band bandwidth is.
In some embodiments, the hollow portion of the metal hollow structure includes a cross-shaped hollow shape, a maximum cross-sectional size of the cross-shaped hollow shape is positively correlated with a central frequency band of the transmission frequency band, and a width of the protruding portion of the cross-shaped hollow shape is positively correlated with a frequency band bandwidth of the transmission frequency band.
Fig. 8 schematically shows a microstructural schematic of a filter according to an embodiment of the invention.
As shown in fig. 6 and 8, the filter 10 is mainly composed of a metal material and a periodic microstructure 11 (e.g., a metal hollow structure such as a through hole) thereon. For example, the structure model may be in a cross shape, and actually, filter structure models of different structure models (such as a jerusalem cross, a Y shape, a circle shape, etc.) may be selected according to the use requirement to meet the use requirement. Taking the "ten" shaped microstructure as an example, the unit structure of the filter 10 can be represented by the following parameters: a, b and c are uniquely determined. Where a is the periodic spacing between the units, b is the length of the cruciform slot, and c is the width of the cruciform slot. The transmission frequency of the filter 10 is mainly affected by b, the larger b the higher the center peak frequency of its transmission frequency. The bandwidth of the filter transmission spectrum is mainly affected by c, which is wider the larger the c is. The values of a, b and c can be optimized by High Frequency Structure Simulator (HFSS) or three-dimensional electromagnetic field simulation software (CST) to select proper size.
Fig. 9 schematically shows a schematic diagram of the transmission spectra of filters of different sizes according to an embodiment of the invention.
As shown in fig. 9, in order to avoid the overlapping of the transmission frequencies from affecting the testing effect, the filter 10 should be designed to have the transmission frequencies distributed uniformly. The left diagram of fig. 9 shows the transmission frequencies for a length b of four different cross slots with the same cross slot width cf 1~f 4。
The right graph of fig. 9 is the respective transmission spectra simulated for 5 sizes of filter 10 using HFSS simulation software. The right diagram of fig. 9 shows five transmission frequencies 1 to 5 with different widths c of the cross slots and with lengths b of the cross slots.
In certain embodiments, the filter 10 comprises a band pass filter and/or a band stop filter. In some embodiments, the projection of the metal hollow structure corresponding to the filter 10 aligned with the antenna on the plane where the antenna is located covers the antenna. Therefore, noise in the terahertz waves received by the antenna can be effectively reduced.
In a specific embodiment, the processed metamaterial filter is cut into a proper shape and fixed on the metal ring support, so that the rotary filter can be processed and manufactured. The different angular ranges of the rotating filter correspond to filters 10 of different filtering frequencies. In the using process, the corresponding filter 10 can be obtained in real time by testing the angle information of the rotating filter, so as to deduce the filtering frequency at the moment.
The types of broadband detectors that can be used to detect weak terahertz signals emitted by the human body in the related art are limited. Such as a normal temperature radiometer and a Schottky diode mixer, the bandwidths of the radiometer and the Schottky diode mixer are within 100GHz, and the use requirement of multi-band terahertz signal fusion within a wide band range cannot be met. The quasi-optical direct detector based on the schottky diode of VDI company has a wide frequency (about 200 GHz), but cannot meet the requirement of passive signal detection due to its poor sensitivity (pW/hz0.5 order). In the embodiment, a superconducting detector, such as HEB, ACMB, etc., may be used for terahertz wave detection. The superconducting detector is high in sensitivity and can be used for detecting weak terahertz signals radiated by a human body. The terahertz wave detector has a wide bandwidth (up to THz), and can flexibly design a frequency range according to needs, so that the terahertz wave can be detected by using the superconducting detector as a detection unit and combining the superconducting detector with a rotary filter.
A plurality of detectors 20 form a detector array. The detector 20 comprises a centrally located sensing unit 22 and an antenna 21. The sensing unit 22 is used for converting received signals, and the antenna 21 is used for receiving signals, wherein the antenna 21 can be shaped as a helical antenna, a double-slot antenna, or the like, so as to meet the requirements of different signal receiving.
Fig. 11 schematically shows a structural diagram of an antenna according to an embodiment of the present invention.
As shown in fig. 11, the antenna 21 includes a spiral antenna, and a first width of an end of the spiral antenna away from the center of the spiral antenna is larger than a second width of an end of the spiral antenna close to the center of the spiral antenna. Due to the different widths of the two ends, a plurality of different equivalent antenna lengths (e.g., different lengths from the middle of one end to the middle and edge of the other end) can be provided, thereby enabling a wider bandwidth. The helical antenna can feed the received terahertz waves into the sensitive unit 22.
In some embodiments, in order to achieve detection of a wide spectrum of terahertz signals, an antenna-coupled bolometer may be employed as the sensitive unit. Wherein the antenna used by the detector is an ultra-wideband logarithmic spiral antenna. The inner diameter of a helical antenna determines the upper transmission frequency at which it operatesf HThe outer diameter of the antenna determines the lower transmission frequency at which it operatesf L. Since the impedance of the helical antenna on the silicon substrate is 75 ohms, impedance matching issues need to be considered when actually designing the sensitive unit 22 of the detector. The sensitive unit of the detector can be made of niobium, niobium nitride, niobium titanium nitride and other superconducting materials. According to the test requirement, the detector can adopt a structure of the HEB to realize the characteristic of high-speed response (response time ps magnitude), and also can adopt ACMB of a structure of the suspension bridge to realize the characteristic of high sensitivity (sensitivity is fW/Hz0.5 magnitude). The detector may be fabricated using a silicon process flow. The HEB type detector is difficult to realize array due to high processing and preparation difficulty, and is suitable for application scenes of single channels or small arrays. The ACMB type detector is moderate in response speed, low in processing difficulty and easy to realize array, so that the method is suitable for a large-array application scene, such as an application occasion of real-time terahertz passive human body security inspection.
In order to improve the reception efficiency of the detector antenna and to improve the directivity of the detector, the detector may be provided with a suitable lens or horn antenna. Due to the narrow bandwidth of the horn antenna, it is not suitable for large bandwidth application scenarios.
In certain embodiments, the filter 10 further comprises at least one of the following dielectric lenses.
For example, the first dielectric lens is arranged on one side of the metal hollow structure with the first designated thickness, which is far away from the dielectric substrate.
For example, the second dielectric lens is arranged on one side of the dielectric substrate far away from the metal hollow structure with the first designated thickness.
For example, the third dielectric lens is arranged on one side of the metal hollow structure with the second specified thickness.
Fig. 10 schematically shows a structural view of a dielectric lens of a position regulator according to an embodiment of the present invention.
As shown in fig. 10, the filter 10 may include a dielectric substrate 111, the dielectric substrate 111 having a first surface and a second surface disposed opposite to each other. Wherein a plurality of detectors are arranged at the first surface of the dielectric substrate 111, each detector may comprise at least one sensitive unit 22. A plurality of dielectric lenses 80 are provided on the second surface of the dielectric substrate 111. The dielectric lens 80 is mounted through a lens mounting portion 113 on a dielectric substrate 111. The lens mounting portion 113 fixedly mounts the dielectric lens 80 on the dielectric substrate 111, and the dielectric lens 80 is located at a position opposite to the detector, so that the dielectric lens 80 can enhance the signal receiving capability of the detector and improve the response rate of the detector.
To align the dielectric lens 80 with the detector, an alignment threshold between the dielectric lens 80 and the detector may be set, which may be a set threshold. For example, the threshold value is set, for example, in the range of 0 to 10 μm. For example 2 microns, 5 microns or 10 microns. That is, as long as the amount of deviation between the center of the lens mounting portion 113 and the center of the detector is within the threshold range, the signal receiving capability of the detector can be ensured, and the response rate of the detector can be improved.
Referring to fig. 1 and 10, the detector 20 may include an antenna 21 and a sensing unit 22. The projection of the detector 20 (including the sensing unit 22 and the antenna 21) on the dielectric substrate 111 is positioned in the projection of the lens mounting part 113 on the dielectric substrate 111, so that the dielectric lens 80 can effectively focus the signal to the detector 20, and the signal collection capability of the detector 20 is improved.
In some embodiments, the center of the detector 20 coincides with the center of the sensitive unit 22. By making the center of the detector 20 coincide with the center of the sensing unit 22, the signal collection by the dielectric lens 80 can be better received by the sensing unit 22. In addition, when the detector 20 and the lens mounting portion 113 are positioned, alignment can be performed by a double-sided lithography machine, for example, by aligning a first alignment mark and a second alignment mark provided on both surfaces of the dielectric substrate 111, respectively, and aligning the center of the detector 20 and the center of the lens mounting portion 113, so that the offset can be controlled within a set threshold value more favorably, and the alignment accuracy can be improved.
For example, a plurality of detectors 20 are optically defined in certain areas of a surface of the dielectric substrate 111 by a double-sided lithographic process to form a detector array. Alignment is performed by a double-sided lithography machine and an alignment mark, and a distance coordinate parameter of the lens mounting portion 113 and the alignment mark is determined, thereby determining a position of the lens mounting portion 113 to be subjected to lithography so that a shift amount of the center of the detector 20 from the center of the lens mounting portion 113 is within a set threshold. That is, by providing the lens mounting portion 113 at a position opposed to each detector 20 and performing alignment using a double-sided lithography machine, it is possible to improve the accuracy of mounting the dielectric lens 80, enhance the signal receiving capability of the detector 20, and improve the response rate of the detector 20.
In some embodiments, the type of dielectric lens 80 includes at least one of a sub-hemispherical lens, a hemispherical lens, and a hyper-hemispherical lens, which may be selected according to actual needs. For example, in the detector array, all the dielectric lenses 80 may be set as hemispherical lenses, or some of the dielectric lenses 80 may be set as hemispherical lenses and some may be set as sub-hemispherical lenses or super-hemispherical lenses, according to different requirements. Among them, the dielectric lens 80 may be a silicon lens.
For example, the terahertz signals can be effectively converged and the dielectric surface waves can be eliminated by adopting the hyper-hemispherical lens. By adopting the secondary hemispherical lens, a large-scale detector array can be realized by utilizing a micro-processing technology, and the signal-to-noise ratio of the device is improved by utilizing the convergence effect of the secondary hemispherical lens.
In some embodiments, a dielectric lens 80 is employed in conjunction with the detector 20. Since the detector 20 is formed by processing a silicon substrate having a high resistance, the dielectric lens 80 may be made of a high-resistance silicon material in order to improve the efficiency of signal transmission.
In some embodiments, the apparatus may further include: a power source, a movable portion of which is configured to drive the position adjuster 30 to move, and a position and/or an angle of which has a corresponding relationship with the transmission band.
For example, the power source may be a motor, and a rotating shaft of a rotor of the motor is fixedly connected to the position adjuster 30. When the rotor rotates, the shaft rotates the position adjuster 30 to change the positions of the plurality of filters 10.
Another aspect of the present invention further provides a system for detecting terahertz signals.
Fig. 12 schematically shows a schematic diagram of a system for detecting terahertz signals according to an embodiment of the present invention.
As shown in fig. 12, the system for detecting a terahertz signal may include: the device for detecting terahertz signals, the position determination device 40 and the processor 50 as above.
The position determining means 40 is configured to determine the position of the plurality of filters 10.
The processor 50 is electrically connected to the position determining device and the detector, respectively.
In particular, the detector 20 further comprises a sensitive unit 22 electrically connected to the antenna 21, the sensitive unit 22 being configured to convert the filtered terahertz waves from the antenna 21 into terahertz signals. Wherein the processor 50 is configured to determine a transmission frequency band based on the positions of the plurality of filters 10 from the position determining device 40, and to derive a detection signal based on the transmission frequency band and the terahertz signal from the detector 20.
For example, the position determining means may be an encoder. The encoder may be provided in the power source. The position specifying device may be software that specifies position information by integrating velocity, acceleration, and the like.
Fig. 13 schematically shows a schematic view of a system for detecting a terahertz signal according to another embodiment of the present invention.
As shown in fig. 13, the system may further include: an offset readout circuit 60 and an analog-to-digital conversion circuit 70.
Wherein, the input end of the bias readout circuit 60 is electrically connected with the output end of the detector and is configured to perform signal amplification on the terahertz signal from the detector.
An input end of the analog-to-digital conversion circuit 70 is electrically connected with an output end of the bias readout circuit, and is configured to sample the amplified terahertz signal (analog signal) and send sampling information (digital signal) to the processor, so that the processor performs at least one function of multi-band terahertz image fusion or material identification based on the sampling information.
In some embodiments, the system may further include: a power source. The power source comprises a motor, and the rotating speed and the rotating angle of a rotating part of the motor are related to at least one of the following factors: the response speed of the detector, the lobe width of the detector, the distribution of the plurality of filters 10 in the position adjuster 30, the transmission band of each of the plurality of filters 10, or the number of filters 10.
For example, a system for detecting terahertz signals may include a filter 10, a position adjuster 30, a motor controller, a dielectric lens, a detector 20, an offset readout circuit 60, an analog-to-digital conversion circuit (ADC circuit) 70, and a processor 50. Wherein the position regulator 30 is fixed to a motor through a central through hole. The angle information of the rotation of the motor is acquired through the motor controller and transmitted to the computer, and the processor can judge the transmission frequency of the working area of the rotation filter at the moment according to the angle information. The rotating speed of the motor can be flexibly adjusted according to actual needs (a few Hz to a few kHz). The weak terahertz signal emitted by the detection object passes through the filter 10 and is received by the detector 20. The offset readout circuit 60 provides an appropriate offset voltage for the detector 20, amplifies the response signal of the detector 20 and sends the amplified signal to the ADC circuit 70, and the ADC circuit 70 samples the signal and sends the sampled signal to the processor 50. The processor 50 combines the transmission frequency corresponding to the angle information at the same time with the detected signal intensity, and the intensity corresponding to different frequencies of the detected object can be obtained by rotating the position regulator 30, so that the signals with different frequencies can be fused to realize the purpose of application.
The device and the system for detecting the terahertz signals provided by the embodiment of the invention can realize the rapid detection of the multi-frequency signals by only adopting a detector with a wide frequency band. The device has a simple structure, is easy to operate, can quickly acquire the frequency spectrum information of an object to be detected, and can realize the functions of multi-band terahertz image fusion, substance identification and the like by utilizing the information.
In another aspect of the present invention, a method for detecting a terahertz signal is also provided.
The method of detecting a terahertz signal is applied to an apparatus for detecting a terahertz signal as described above, or to a system for detecting a terahertz signal as described above.
Fig. 14 schematically shows a schematic diagram of a method of detecting a terahertz signal according to an embodiment of the present invention.
As shown in FIG. 14, the method may further include operations S1410-S1420.
In operation S1410, the position adjuster is controlled to move to change the positions of the plurality of filters.
In operation S1420, at least one of the plurality of filters is aligned with the antenna to filter the terahertz signal from the detection object by the filter aligned with the antenna, so that the detector can acquire the terahertz signal corresponding to the filtered terahertz wave.
In some embodiments, the method may further include the operations of: first, the transmission spectrum of the filter aligned to the antenna is determined. And then, fusing the transmission spectrum and the terahertz signal corresponding to the filtered terahertz wave to obtain the terahertz signal of the specified frequency band aiming at the detection object. Wherein the terahertz signal of the specified frequency band for the detection object can be determined in a manner of superimposing the transmission spectrum of the filter and the terahertz signal corresponding to the filtered terahertz wave.
In some embodiments, the method may further include the operations of: imaging is carried out on the terahertz signal of the specified frequency band aiming at the detection object, and a terahertz image of the specified frequency band aiming at the detection object is obtained. Therefore, the terahertz image with the designated frequency band can be applied to application scenes such as security check and the like.
Fig. 15 schematically shows a schematic view of a method of detecting a terahertz signal according to another embodiment of the present invention.
As shown in FIG. 15, the method may further include operations S1510-S1530.
In operation S1510, the position adjuster is controlled to move such that the plurality of filters are respectively aligned with the antenna at different periods of time to acquire terahertz signals of a plurality of different specified frequency bands for the detection object. Specifically, the position regulator movement may be controlled by controlling the rotational angle of the rotor of the motor.
In operation S1520, terahertz signals of a plurality of different specified frequency bands for the detection object are respectively imaged, resulting in terahertz images of each of the plurality of specified frequency bands for the detection object.
In operation S1530, terahertz images for each of a plurality of specified frequency bands of the detection object are fused, resulting in a multi-band terahertz fused image for the detection object.
Specifically, a plurality of image fusion techniques may be adopted in image fusion, and are not described herein again.
The present invention also provides a computer-readable storage medium, which may be contained in the apparatus/system described in the above embodiments; or may exist separately and not be incorporated into the device/system. The computer-readable storage medium carries one or more programs which, when executed, implement the method according to an embodiment of the present invention.
According to embodiments of the present invention, the computer readable storage medium may be a non-volatile computer readable storage medium, which may include, for example but is not limited to: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. For example, according to embodiments of the present invention, a computer-readable storage medium may include the ROM and/or RAM described above and/or one or more memories other than ROM and RAM.
Embodiments of the invention also include a computer program product comprising a computer program comprising program code for performing the method provided by the embodiments of the invention, when the computer program product is run on an electronic device, for causing the electronic device to implement the image model training method or the method of aggregating identification codes provided by the embodiments of the invention.
The computer program, when executed by a processor, performs the above-described functions defined in the system/apparatus of an embodiment of the present invention. The above described systems, devices, modules, units, etc. may be implemented by computer program modules according to embodiments of the invention.
In one embodiment, the computer program may be hosted on a tangible storage medium such as an optical storage device, a magnetic storage device, or the like. In another embodiment the computer program may also be transmitted in the form of a signal on a network medium, distributed and downloaded and installed via the communication part and/or installed from a removable medium. The computer program containing program code may be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
According to embodiments of the present invention, program code for executing a computer program provided by embodiments of the present invention may be written in any combination of one or more programming languages, and in particular, the computer program may be implemented using a high level procedural and/or object oriented programming language, and/or an assembly/machine language. The programming language includes, but is not limited to, programming languages such as Java, C + +, python, the "C" language, or the like. The program code may execute entirely on the user computing device, partly on the user device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
It will be appreciated by a person skilled in the art that various combinations and/or combinations of features described in the various embodiments and/or in the claims of the invention are possible, even if such combinations or combinations are not explicitly described in the invention. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present invention may be made without departing from the spirit or teaching of the invention. All such combinations and/or associations fall within the scope of the present invention.
The embodiments of the present invention have been described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention, and these alternatives and modifications are intended to fall within the scope of the invention.
Claims (17)
1. An apparatus for detecting terahertz signals, comprising:
the filter comprises a plurality of filters, wherein at least part of the filters are respectively provided with different transmission frequency bands, and the maximum size of the hollow parts in the respective metal hollow structures of the at least part of filters is positively correlated with the central frequency band and the frequency band bandwidth of the transmission frequency band;
a detector including an antenna configured to receive terahertz waves and a sensitive unit for converting a received signal; and
a position adjuster disposed at one side of the antenna and configured to drive the plurality of filters to move to change positions of the plurality of filters;
wherein the filter comprises a dielectric substrate and a metal hollow structure with a first specified thickness positioned on the surface of the dielectric substrate,
the filter further comprises at least one of:
the first dielectric lens is arranged on one side, far away from the dielectric substrate, of the metal hollow structure with the first specified thickness;
the second dielectric lens is arranged on one side of the dielectric substrate far away from the metal hollow structure with the first specified thickness,
the dielectric substrate is provided with a first surface and a second surface which are oppositely arranged, the first surface of the dielectric substrate is provided with a plurality of detectors, the second surface of the dielectric substrate is provided with a plurality of dielectric lenses which are opposite to the detectors, the dielectric lenses are arranged on the dielectric substrate through lens mounting parts,
the center of the detector coincides with the center of the sensitive unit,
by changing the positions of the plurality of filters such that at least one of the plurality of filters is aligned with the antenna to filter a terahertz wave from a detection object by the filter aligned with the antenna, the detector is enabled to acquire a terahertz signal corresponding to the filtered terahertz wave.
2. The apparatus of claim 1, wherein:
the position adjuster includes a rotating member on which the plurality of filters are respectively provided in regions corresponding to a plurality of angular ranges;
and/or
The position adjuster includes a translation member, and the plurality of filters are respectively provided in regions corresponding to a plurality of position ranges on the translation member.
3. The apparatus of claim 2, wherein the rotating component comprises:
a support portion intersecting with an axis around which the rotating member rotates; and
the support part is arranged on the rotating part, the support part is arranged on the support part, the support part is arranged on one side of the shaft center, the hollow parts are respectively arranged in the areas of the rotating part corresponding to a plurality of angle ranges, and at least part of the hollow parts are provided with the filter.
4. The apparatus of claim 1, wherein:
the filter comprises a metal hollow structure with a second specified thickness, and the second specified thickness is larger than the first specified thickness.
5. The apparatus of claim 4, wherein the filter further comprises:
and the third dielectric lens is arranged on one side of the metal hollow structure with the second specified thickness.
6. The apparatus of claim 4, wherein the hollow portion of the metal hollow structure comprises a cross-shaped hollow shape, a maximum cross-sectional dimension of the cross-shaped hollow shape is positively correlated with the central frequency band of the transmission frequency band, and a width of the protruding portion of the cross-shaped hollow shape is positively correlated with the frequency band bandwidth of the transmission frequency band.
7. The apparatus of claim 4, wherein the filter comprises a band pass filter and/or a band stop filter; and
and the projection of the plane where the antenna is located covers the antenna by the metal hollow structure corresponding to the filter aligned with the antenna.
8. The apparatus of any one of claims 1 to 7, further comprising:
a power source, wherein the movable part of the power source is configured to drive the position regulator to move, and the position and/or the angle of the movable part has a corresponding relation with the transmission frequency band.
9. The apparatus of any of claims 1-7, wherein the antenna comprises a helical antenna, and wherein a first width of an end of the helical antenna distal from a center of the helical antenna is greater than a second width of an end of the helical antenna proximal to the center of the helical antenna.
10. A system for detecting terahertz signals, comprising:
the device for detecting a terahertz signal according to any one of claims 1 to 9;
a position determining device configured to determine positions of the plurality of filters;
a processor electrically connected to the position determining device and the detector, respectively;
the detector further comprises a sensitive unit electrically connected with the antenna, the sensitive unit being configured to convert the filtered terahertz waves from the antenna into terahertz signals; wherein the content of the first and second substances,
the processor is configured to determine a transmission band based on the positions of the plurality of filters from the position determination device, and derive a detection signal based on the transmission band and a terahertz signal from the detector.
11. The system of claim 10, further comprising:
an offset readout circuit, an input end of which is electrically connected with an output end of the detector, and is configured to perform signal amplification on the terahertz signal from the detector; and
and the input end of the analog-to-digital conversion circuit is electrically connected with the output end of the bias readout circuit, and the analog-to-digital conversion circuit is configured to sample the amplified terahertz signal and send sampling information to the processor, so that the processor can perform at least one function of multi-band terahertz image fusion or substance identification based on the sampling information.
12. The system of claim 10, wherein the power source of the device comprises a motor, wherein the rotational speed and rotational angle of the rotating portion of the motor is related to at least one of: the response speed of the detector, the lobe width of the detector, the distribution mode of the plurality of filters in the position regulator, the transmission frequency bands of the plurality of filters or the number of the filters.
13. A method for detecting terahertz signals, applied to the device of any one of claims 1 to 9 or the system of any one of claims 10 to 12, the method comprising:
controlling the position adjuster to move to change positions of the plurality of filters such that at least one of the plurality of filters is aligned with the antenna to filter a terahertz signal from a detection object by the filter aligned with the antenna, so that the detector can acquire the terahertz signal corresponding to the filtered terahertz wave.
14. The method of claim 13, further comprising:
determining a transmission spectrum of the filter aligned to the antenna; and
and fusing the transmission spectrum and the terahertz signal corresponding to the filtered terahertz wave to obtain the terahertz signal of the specified frequency band aiming at the detection object.
15. The method of claim 14, further comprising:
imaging the terahertz signal of the specified frequency band aiming at the detection object to obtain a terahertz image of the specified frequency band aiming at the detection object.
16. The method of claim 14, further comprising:
controlling the position regulator to move, so that the plurality of filters are respectively aligned to the antenna at different time intervals to acquire terahertz signals of a plurality of different specified frequency bands aiming at the detection object;
imaging the terahertz signals of the plurality of different specified frequency bands aiming at the detection object respectively to obtain terahertz images of the plurality of specified frequency bands aiming at the detection object respectively; and
and fusing the terahertz images of the plurality of specified frequency bands aiming at the detection object to obtain a multi-band terahertz fused image aiming at the detection object.
17. A non-transitory computer-readable medium comprising a computer program product recorded thereon and capable of being executed by a processor, the computer program product comprising program code instructions for implementing the method according to any one of claims 13 to 16.
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| CN202111335790.5A CN113777072B (en) | 2021-11-12 | 2021-11-12 | Apparatus, system, method, medium, and program product for detecting terahertz signal |
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| CN202111335790.5A CN113777072B (en) | 2021-11-12 | 2021-11-12 | Apparatus, system, method, medium, and program product for detecting terahertz signal |
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