CN104965233B - Multifrequency Terahertz detection system - Google Patents
Multifrequency Terahertz detection system Download PDFInfo
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Abstract
The invention discloses a kind of multifrequency Terahertz detection systems comprising: terahertz optics system is suitable for obtaining the background THz wave that the THz wave for being detected human body sending or object to be detected are reflected, and assembles to it；The detector of multiple and different frequencies, is suitable for receiving the THz wave for the different frequency that the terahertz optics system is assembled respectively, and the THz wave of respective frequencies is converted into electric signal respectively；Detected human body or object to be detected is imaged in imaging device, the electric signal and its imaging position for being suitable for being transmitted according to the detector；The display device is suitable for showing the imaging device imaging on a display screen.It can detecte dangerous goods entrained in the objects such as human body or luggage using multifrequency Terahertz detection system of the invention, and can classify to it.
Description
Technical field
The present invention relates to the technical field of terahertz imaging, more particularly, to detection human body and its article of carrying, with
And the multifrequency Terahertz detection system of the objects such as luggage run on a moving belt.
Background technique
Terahertz (THz) wave refer to frequency range between 0.1-10THz (i.e. wavelength be 3000-30) electromagnetic wave
(1THz=1012Hz).The long-wave band of THz wave coincides with millimeter wave (submillimeter wave), and short-wave band is (remote red with infrared ray
It coincides outside), belongs to forefathers and study less wave band.Terahertz has the advantages that many uniquenesses, such as the photon of THz wave
Energy is far below visible light and X-ray, the only one thousandth of visible light, hundred a ten thousandths of X-ray, harm to the human body pole
It is small, harmful ionization will not be generated to biological tissue.THz wave wavelength is longer, and the wavelength of the electromagnetic wave of 1THz is 300,
It is influenced when for measuring detection by substance scattering small；In addition, THz wave has good penetration capacity, such as Terahertz
Radiation energy with the decaying of very little penetrate as fat, carbon plate, cloth, plastics, ceramics, leather and fur, even most of nonmetallic materials and
Apolar substance, while largely being absorbed or being reflected by metal, colloid, explosive, drugs, currency and liquid etc..Therefore Terahertz
Technology is as public security protection detection technology, and in airport, subway, railway station etc., crowded applications demand is very big.
Currently, applied to the predominantly imaging and passive imaging technology of terahertz imaging system, by quickly being swept to human body or object
Imaging is retouched, the target of dangerous goods placed in things concealed entrained by detection human body or object (such as luggage etc.) etc. is reached,
But it cannot classify to detected article, and image taking speed and image quality need to be further increased.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State the multifrequency Terahertz detection system of problem.
According to the present invention, a kind of multifrequency Terahertz detection system is provided comprising terahertz optics system, multiple and different frequencies
Detector, imaging device and the display device of rate.Wherein, the terahertz optics system, which obtains, is detected human body sending too
The THz wave that Hertz wave and the detected human body issue be detected the scattering of article entrained by human body, transmission and/or
The background THz wave that THz wave or object to be detected after absorption are reflected, and it is assembled；The multiple difference
The detector of frequency is selected to the response of different frequency with them according to the type of the detected article and is suitable for connecing respectively
The THz wave for the different frequency that the terahertz optics system is assembled is received, and respectively converts the THz wave of respective frequencies
At electric signal；The imaging device is according to the electric signal of the multiple different detector transmission to detected human body or detected material
Body is imaged and is merged respectively；The display device shows the imaging device imaging on a display screen.Its
In, the terahertz optics system may include scanning means and condenser lens, wherein the scanning means is suitable for passing through rotation
Detected human body and its entrained article or object to be detected are scanned, the THz wave for being detected human body radiation is obtained
And through be detected human body entrained by article scattering, transmission and/or absorb after THz wave or object to be detected reflected
Background THz wave；The THz wave that the condenser lens is suitable for obtaining the scanning means is assembled.
Optionally, the scanning means and the focusing device are realized by the ellipsoidal mirror being able to rotate, the ellipsoid
Face reflecting mirror will be scanned and is combined into one with focusing function.
Optionally, the detector of the multiple different frequency is multiple detectors of two or more frequency.It can
Selection of land, the multiple detector array are rectangular.Such as the detector when 12 detectors, every kind of frequency using 3 kinds of frequencies
When being 4,12 detector arrays are at 3X4 array or 4X3 array.Optionally, the multiple detector array Cheng Zhi
Line style.Optionally, the multiple detector lines up multirow stragglyly.Such as when 12 detectors, every kind using three kinds of frequencies
When the detector of frequency is 4,12 detector array Cheng Sanhang, and middle row differs half of detection with upper and lower two row
The distance of the width of device.
Using multifrequency Terahertz detection system of the invention, dangerous goods entrained by human body or luggage can detecte
The dangerous goods filled in equal objects, and can classify to it.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 shows the schematic diagram of multifrequency Terahertz detection system according to embodiment of the present invention；
Fig. 2A and Fig. 2 B shows and is detected obtained from multifrequency Terahertz detection system through the invention is detected
The image of human body；
Fig. 3 shows a kind of schematic diagram of embodiment of the disposing way in multiple detectors according to the present invention；
Fig. 4 shows the schematic diagram of another embodiment of the disposing way of multiple detectors according to the present invention；And
Fig. 5 shows the schematic diagram of another embodiment of the disposing way of multiple detectors according to the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
Fig. 1 shows a kind of schematic diagram 100 of the multifrequency Terahertz detection system of embodiment according to the present invention.Such as figure
Shown in 1, the multifrequency Terahertz detection system 100 include: terahertz optics system 110, multiple and different frequencies detector 140,
Imaging device 150 and display device 160.Wherein, the terahertz optics system 110 obtains detected human body 170 and is radiated
THz wave and through be detected human body entrained by article scattering, transmission and/or absorb after THz wave or be detected
The background THz wave that object 170 is reflected.Article such as explosive, gun, cutter entrained by the detected human body etc.
Dangerous material.The object to be detected includes the luggage etc. equipped with dangerous material such as explosive, gun, cutters.Usual human body can radiate
The THz wave of multi-frequency.The object that the THz wave of radiation different frequency is also had around object to be detected, is detected
The THz wave that object can radiate objects other around it reflects.The terahertz optics system 110 obtains tested
The THz wave and the Terahertz after being detected the scattering of article entrained by human body, transmission and/or absorption for surveying human body radiation
After the background THz wave that wave or object to be detected are reflected, the detector 140 of multiple and different frequencies is transmitted it to, it is different
The THz wave of respective frequencies is converted into electric signal by the detector 140 of frequency, is exported to imaging device 150.Imaging device 150
According to the electric signal of different detectors transmission to detected human body 170 and its entrained article or object to be detected
170 are imaged, and then show imaging in display device 160.
Wherein, the terahertz optics system 110 may include scanning means 120 and focusing device 130.The scanning dress
120 are set to be suitable for being scanned detected human body or object 170, it can be opposite, off-axis using rotary two
Circular flat reflecting mirror realizes two-dimentional point by point scanning；It can also be realized using tilting mirror.The tilting mirror can be using rotatably
Regular polygon prism, that is, polyhedral prism cross section be regular polygon, the side of the regular polygon prism is that plane is anti-
Face is penetrated, it, can be by the THz wave received by it from detected human body and through being detected when tilting mirror rotation
The background Terahertz that THz wave or object to be detected after the scattering of article entrained by human body, transmission and/or absorption are reflected
Wave is constantly reflected on focusing device 130.Such as human body can be issued using the regular five-hedron prism being able to rotate
THz wave projected on focusing device 130 by the reflection in the plane reflection face on tilting mirror, can by the rotation of tilting mirror
To be scanned to the circle circle of human body one, so as to constantly obtain THz wave that detected human body is radiated and through quilt
The background that THz wave or object to be detected after article scattering, transmission and/or absorption entrained by detection human body are reflected is too
Hertz wave.Scanning means 120 is started to work after terahertz imaging system 100 of the invention is powered.Focusing device 130 is suitable for
Scanning means 120 is scanned to Terahertz light obtained from when being detected human body or object to be detected to assemble, is then passed
The detector 140 of different frequency is given, to facilitate detector 140 to detect, because the probe of detector 140 is smaller, such as
Fruit investigative range is too big, will affect the Effect on Detecting of detector 140.Focusing device 130 can for example be realized using convex lens.
In addition, the scanning means 120 and focusing device 130 can also be realized using ellipsoidal mirror, the ellipsoid
Face reflecting mirror will be scanned and is combined into one with focusing function.
The detector 140 includes multiple detectors with different frequency, is also possible to the detection with multiple probes
The look-in frequency of device, different probes can be different.The different frequency of the detector 140 or detector 140 of different frequency
The THz wave for the different frequency that probe respectively radiate detected human body 170 with different frequencies and through detected human body institute
The background THz wave that THz wave or object to be detected 170 after article scattering, transmission and/or the absorption of carrying are reflected
It is detected.Optionally, the detector 140 of the multiple different frequency is placed in the terahertz optics system 110 and focuses
On position at or near the focal plane of device 130.The pyroelectricity that the detector for example can be detection microbolometric is visited
Survey device.
It is mainly described in detail and how it to be carried out using multiple detectors by taking human body and its entrained article as an example below
Detection.Equally applicable to the detection of the luggage on other objects such as conveyer belt, only at this moment detected THz wave comes from
In the reflection for the Terahertz that the objects such as the luggage radiate its surrounding objects.
The THz wave of different frequency can be radiated due to being detected human body, when detected human body carries different articles
When, the THz wave of these different frequencies different article transmissions, scattering entrained by human body, and/or absorb after, intensity
Variation is also different, and after the detector of different frequency detects the different THz wave of these Strength Changes, can be generated not
Same electric signal, this can reflect out transmission, scattering, and/or absorption characteristic of the different articles to THz wave.Imaging device
150 are imaged based on different electric signals, and detected human body carries the image and these objects in the region of these different objects
Background image around body is contrasted, thus can identify the pattern and type of these articles.
For example, the detection that three detectors use is frequently when being detected using the detector of three different look-in frequencies
Rate is respectively for example 360GHz, 220GHz and 94GHz, when carrying the objects such as explosive, cutter, pistol on detected human body 170
When product, by transmission, scattering, and/or the absorption spy of the THz wave that explosive, cutter, pistol and other items radiate human body
Property it is different, so the terahertz for the different frequency that explosive, cutter, pistol and other items radiate the human body of its position
Hereby the transmitance of wave is different, so that the intensity for the THz wave that these human bodies are given off changes.Difference is visited
The detector of measured frequency detects the THz wave of different frequency and converts thereof into electric signal, such as voltage signal, the electricity
The power for the THz wave that the different parts of signal and detected human body are radiated changes linearly.For example, carrying explosive
Human body radiation THz wave, due to different explosives to the transmission of the THz wave of different frequency, scattering and/
Or the difference of absorption characteristic, so that after the THz wave is detected through the detector of 360GHz, 220GHz and 94GHz, respectively
To voltage A, B, C, and A ≠ B ≠ C signal.And the Terahertz for the human body radiation for carrying metal knife, pistol and other items
Wave respectively obtains the signal of voltage D, D, D after the detector detection through 360GHz, 220GHz and 94GHz.Voltage A, B, C, D are small
The electricity obtained from the detection for the THz wave that the human body to no placement explosive, cutter, pistol and other items is radiated
Pressure.Therefore, when the electric signal of detector 140 generation of the imaging device 150 based on same frequency and its imaging position (are based on terahertz
The position of detected human body or object corresponding to the THz wave that hereby optical system 110 is assembled and determine) when being imaged,
The different parts of human body just will form image deep mixed, with different contrast, then again will be based on different frequency
The image that detector is formed by different colours (such as when being detected using the detector of three kinds of frequencies, then will form 3 kinds not
With the image of color) it is merged, it can be further improved image recognition effect in this way.Fig. 2A is shown to before detected human body
Image formed by face, as shown in Figure 2 A, chest, abdomen and the right side have black image everywhere across side, this illustrates to be detected human body
This four positions be placed with article.Fig. 2 B is shown to image formed by the detected human body back side, as shown in Figure 2 B, right
Buttocks shows a shape as the black image of pistol.In practice, imaging device 150 is in for position where different articles
Existing different images are presented when according to difference and its imaging on electric signal generated under the detector of different look-in frequencies
Shape etc. can mark different colors on the image so that it is that testing staff can soon identify for what object
Product.
Using multifrequency Terahertz detection system of the invention, it can more delicately detect and be taken in detected person's body
The different articles of band, as long as will be generated to the THz wave that human body is radiated different degrees of because carrying different articles
Transmission, scattering and/or absorption, that is, so that different degrees of decaying occurs for THz wave, thus final formed human body image
Shadow deep mixed, of different shapes will be generated at the different position of human body or be labeled out different colours, to remind
Testing staff pays attention to.
In addition, some articles are very high to the transmitance of the THz wave of a certain frequency, when this article be hidden in it is detected
When with human body, if detected using the detector of this frequency, almost detect less than this article.But this article
Then may be less high to the transmitance of the THz wave of other frequencies, i.e., this article to the absorptions of other frequencies and/or
Scatter it is bigger, so, when the detector using other frequencies is detected, the terahertz of this frequency can be detected
Hereby wave is attenuated, and this article is carried in detected person's body so as to detect.For example, if first object is to 220GHz
THz wave absorb it is stronger but weak to the absorption of 360GHz.Second object is weaker to the THz wave absorption of 220GHz frequency, but
The THz wave of 360GHz is absorbed strong.In this way, the presence of first object can be detected by the detector of 220GHz, to second object
Detection be ambiguous；And the presence of second object can be then detected by the detector of 360GHz, the detection to first object
It is ambiguous.Therefore, it can be improved by using multifrequency Terahertz detection system of the invention to detected personnel institute
The recall rate of the suspicious object of carrying, prevents missing inspection.And human body is detected using devices such as X-rays, on the one hand to human body
Have harmful effect, on the other hand, some articles to X-ray there is no barrier effect or barrier effect are very weak, such as it is certain
Polymer and foamed material not will form image after X-ray detection, therefore the problem of will appear missing inspection.But utilize this
The multifrequency Terahertz detection system of invention, then can avoid this problem.
Depending on the quantity of the detector of used different frequency is as needed, it is typically different the quantity of the detector of frequency
Identical, image procossing subsequent in this way can be easier.Furthermore it is possible to be visited using the detector of two kinds of different look-in frequencies
It surveys, the detector that three kinds or more different look-in frequencies can also be used is detected, can be according to the type of detected article and they
The response of different frequency is determined.Equally, the detector array of multiple probes with different look-in frequencies can also be used.
When using the detector 140 of multiple and different frequencies, wherein the disposing way of detector 140 will affect imaging speed
Degree, and the subsequent progress image procossing of imaging device 150 can also be had an impact.When multifrequency Terahertz detection system of the invention away from
Closer from detected human body or object, then detector is also closer to detected human body or object, thus detected Terahertz
The signal of wave is stronger, thus detector be formed by corresponding electric signal also can be stronger, and then pair of imaging device imaging
It also can be higher than degree.In addition, these are detected when each terahertz optics system 110 scans when detector more than 140 used
The area of space area that device detects just becomes larger, and for determining imaging area range, the time needed for scanning imagery will subtract
Few, the speed of imaging will be faster.
Fig. 3 shows a kind of schematic diagram of embodiment of the disposing way of multiple detectors.As shown in figure 3, when using 12
When a detector, the first row puts the detector of 4 94GHz along straight line, and the second row puts the detection of 4 220GHz along straight line
Device, the third line put the detector of 4 360GHz, form 3 × 4 arrays.This disposing way is simple, is easily worked production and is
System is integrated.As previously described, because the detector that mode shown in Fig. 3 uses is more, so image taking speed can be accelerated.
In addition, above-mentioned 12 detectors are also not necessarily limited to a kind of above-mentioned disposing way, such as all at least put in each row
The detector of one different frequency.In addition, above-mentioned 12 detectors can also put into 4 × 3 arrays etc..In short, can root
A kind of preferable disposing way of effect is selected according to situation.
It, can be using mentioned-above tilting mirror as scanning dress when multiple detectors use disposing way shown in Fig. 3
120 are set, when so that tilting mirror rotating every time, 12 detectors can receive corresponding THz wave simultaneously.
Fig. 4 shows the schematic diagram of another embodiment of the disposing way of multiple detectors.As shown in figure 4, three spies
It surveys device to arrange in a line from top to bottom shape, and the frequency of three detectors is respectively 94GHz, 220GHz from top to bottom,
360GHz.For this disposing way only with three detectors, quantity is few, at low cost, but image taking speed compares the mode of Fig. 4
It is slow.
In addition, three detectors in Fig. 4 can also put into straight line shape from left to right, the detection of different frequency
The position of device is also not necessarily limited to from left to right be respectively 94GHz, and the detector of 220GHz, 360GHz, the present invention is not spy to this
It does not limit.
When multiple detectors use disposing way shown in Fig. 4, mentioned-above two be able to rotate phase can be used
Pair, the circular flat reflecting mirror of off-axis realize two-dimentional point by point scanning as scanning means 120, pass through circular flat reflecting mirror
High speed rotation, so that 3 detectors can receive corresponding THz wave simultaneously.
Fig. 5 shows the schematic diagram of another embodiment of the disposing way of multiple detectors.As shown in figure 5,12 spies
It surveys the mode of device 140 as shown in Figure 5 and lines up three rows, every row includes 4 detectors.The wherein detector of the first row and the second row
The width that detector differs half of detector (when using single pixel detector, differs half between the detector of adjacent rows
Pixel), the detector of the second row differs the width of half of detector with the detector of the third line.What mode shown in fig. 5 used
Detector is more, and image taking speed is fast.Due to mutually staggering the width of half of detector between adjacent rows, the electric signal actually generated
It can also be staggered in the distribution of the corresponding pixel points of imaging, in this way, imaging device 150 when performing image processing can be at these
Interpolation generates more pixels in turn on the basis of actual pixels, so as to improve imaging resolution, the side of putting shown in fig. 5
The imaging resolution of imaging device 150 can be improved compared with disposing way shown in Fig. 3 much in formula.Fig. 5 is illustrated only
A kind of disposing way that detector adjacent rows offset one from another can also take other similar disposing ways, for example, Fig. 5
The width of middle the third line and the second row wrong half of detector to the right makes the third line and the first row be staggered the width of a detector.
The present invention is to this and is not specifically limited.In addition, the distance being staggered also can according to need and be adjusted.
The disposing way of multiple detectors shown in fig. 5 is similar with disposing way shown in Fig. 3, and scanning means 120 can also
To use mentioned-above tilting mirror.
Above description is merely given as the embodiment of the disposing way of several multiple detectors, and the present invention is not limited to above
Several disposing ways also can according to need the detector using more or less different frequency, corresponding to sweep
Imaging apparatus and focusing device can also be correspondingly adjusted, and to obtain better effect, here, the present invention is to using different
The corresponding scanning means used and focusing device be also and with no restrictions when multiple detectors of disposing way.
The imaging device 150 can be the equipment such as computer, single-chip microcontroller or microprocessor, for according to detector institute
Detected human body and its entrained article or object to be detected is imaged in the electric signal of generation and its imaging position.
The display device 160, connect with imaging device 150, can be computer display screen or other for showing
Show imaging device 150 at image device.
Using multifrequency Terahertz detection system of the invention, can by the detectors of multiple frequencies to detected human body and
The prohibited items filled in the objects such as its hidden prohibited items and luggage for carrying are detected, so that testing staff be made to hold very much
Whether easily get in the specific location and object to be detected of suspicious object entrained by detected human body includes prohibited items,
And the difference and luggage etc. of the transmitance of the THz wave for the different frequency that human body can be radiated according to different articles
Different degrees of reflection of the article filled in object to the THz wave of ambient radiation is detected with the detector of different frequency,
Different electric signals is obtained, by being imaged and being handled based on the electric signal and its imaging position, if indicating difference again
Color, different articles can be identified based on different color and the shape for being formed by image quickly, to reach outstanding
It is to dangerous goods hidden entrained by human body or luggage etc., such as the mesh that explosive, cutter, pistol are quickly identified
's.In addition, image taking speed is fast, and recognition capability is strong using multifrequency Terahertz detection system of the invention, and image quality is high.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that implementation of the invention
Example can be practiced without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this specification.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of the various inventive aspects,
Above in the description of exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the disclosed method should not be interpreted as reflecting the following intention: i.e. required to protect
Shield the present invention claims features more more than feature expressly recited in each claim.More precisely, as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim itself
All as a separate embodiment of the present invention.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments mean it is of the invention
Within the scope of and form different embodiments.For example, in the following claims, embodiment claimed is appointed
Meaning one of can in any combination mode come using.
Various component embodiments of the invention can be implemented in hardware, or to run on one or more processors
Software module realize, or be implemented in a combination thereof.It will be understood by those of skill in the art that can be used in practice
Microprocessor or digital signal processor (DSP) come realize some in browser client according to an embodiment of the present invention or
The some or all functions of person's whole component.The present invention is also implemented as one for executing method as described herein
Point or whole device or device programs (for example, computer program and computer program product).Such this hair of realization
Bright program can store on a computer-readable medium, or may be in the form of one or more signals.It is such
Signal can be downloaded from an internet website to obtain, and is perhaps provided on the carrier signal or is provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and ability
Field technique personnel can be designed alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference symbol between parentheses should not be configured to limitations on claims.Word "comprising" does not exclude the presence of not
Element or step listed in the claims.Word "a" or "an" located in front of the element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of several different elements and being come by means of properly programmed computer real
It is existing.In the unit claims listing several devices, several in these devices can be through the same hardware branch
To embody.The use of word first, second, and third does not indicate any sequence.These words can be explained and be run after fame
Claim.
Claims (7)
1. multifrequency Terahertz detection system, which is characterized in that the system comprises:
Terahertz optics system, what the THz wave and the detected human body for being suitable for obtaining detected human body sending issued
THz wave or object to be detected institute of the THz wave after being detected the scattering of article entrained by human body, transmission and/or absorption
The background THz wave of reflection, and it is assembled；
The detector of multiple and different frequencies selects the response of different frequency with them according to the type of the detected article
Fixed, the detector of the multiple different frequency is suitable for receiving different frequency that the terahertz optics system is assembled respectively too
Hertz wave, and the THz wave of respective frequencies is converted into electric signal respectively；
Imaging device is suitable for electric signal and its imaging position according to the multiple different detector transmission to detected human body
Or object to be detected is imaged and is merged respectively；And
Display device is suitable for showing the imaging device imaging on a display screen；Wherein,
The terahertz optics system includes scanning means and focusing device, wherein
The scanning means is suitable for being scanned detected human body and its entrained article or object to be detected by rotation,
After obtaining the THz wave for being detected human body radiation and being detected the scattering of article entrained by human body, transmission and/or absorbed
THz wave or the background THz wave that is reflected of object to be detected；
The THz wave that the focusing device is suitable for obtaining the scanning means is assembled.
2. multifrequency Terahertz detection system according to claim 1, which is characterized in that
The scanning means and the focusing device are anti-by ellipsoid that is being able to rotate and being combined into one scanning and focusing function
Mirror is penetrated to realize.
3. multifrequency Terahertz detection system according to claim 1, which is characterized in that
The multiple detector array is rectangular.
4. multifrequency Terahertz detection system according to claim 1, which is characterized in that
When the detector of 12 detectors, every kind of frequency using 3 kinds of frequencies is 4,12 detector arrays are at 3X4
Array or 4X3 array.
5. multifrequency Terahertz detection system according to claim 1, which is characterized in that
The multiple detector array is in line type.
6. multifrequency Terahertz detection system according to claim 1, which is characterized in that
The multiple detector lines up multirow stragglyly.
7. multifrequency Terahertz detection system according to claim 6, which is characterized in that
When the detector of 12 detectors, every kind of frequency using three kinds of frequencies is 4,12 detector arrays are at three
Row, and middle row is at a distance from the width that upper and lower two row differs half of detector.
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| CN106066497A (en) * | 2016-07-05 | 2016-11-02 | 成都福兰特电子技术股份有限公司 | A kind of terahertz imaging system for safety check |
| CN109556714A (en) * | 2018-10-31 | 2019-04-02 | 中国科学院半导体研究所 | Terahertz light spectrum chip |
| CN109444976A (en) * | 2018-12-29 | 2019-03-08 | 同方威视技术股份有限公司 | Millimeter wave/THz wave imaging device |
| CN113008907B (en) * | 2019-12-19 | 2024-04-12 | 华为技术有限公司 | Terahertz sensing system and terahertz sensing array |
| CN112505798B (en) * | 2020-11-27 | 2022-07-01 | 河北雄安太芯电子科技有限公司 | Object detection method based on terahertz |
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| JP5354971B2 (en) * | 2007-08-31 | 2013-11-27 | キヤノン株式会社 | Imaging method and apparatus |
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| CN102175662B (en) * | 2011-03-07 | 2013-04-24 | 周利坤 | Portable Terahertz remote sensing detector and remote detection method |
| CN102681023B (en) * | 2012-04-19 | 2014-05-07 | 首都师范大学 | Terahertz wave imaging system |
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