CN104914477A - Terahertz human body security check method - Google Patents
Terahertz human body security check method Download PDFInfo
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- CN104914477A CN104914477A CN201510376869.0A CN201510376869A CN104914477A CN 104914477 A CN104914477 A CN 104914477A CN 201510376869 A CN201510376869 A CN 201510376869A CN 104914477 A CN104914477 A CN 104914477A
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Abstract
The invention discloses a terahertz human body security check method. According to the invention, a drum-type multi-face reflecting rotary mirror swings horizontally back and forth in a rotary manner in front of a human body. A concave mirror receives terahertz waves reflected by the drum-type multi-face reflecting rotary mirror and the enables the terahertz waves to be focused on a terahertz detector. The rotary angles and the swing angles of the drum-type multi-face reflecting rotary mirror are recorded in real time. One-to-one correspondence between the rotary angles and swinging angles and pixel point coordinates of a scanning image is established. Terahertz signals detected in different rotary angles and swinging angles are converted to image gray values and the image gray values are filled into the pixel points with the corresponding coordinates one by one, so that an integral scanning image is formed. The terahertz human body security check method provided by the invention has advantages of being high in scanning speed, low in vibration and noise, clear in image formation, low in distortion and high in resolution.
Description
Technical field
The invention belongs to Terahertz applied technical field, particularly relate to a kind of Terahertz human body safety check method.
Background technology
Terahertz is the electromagnetic wave of frequency at 0.1THz-10THz, and wave band is between infrared and millimeter wave, is in important position in electromagnetic wave spectrum.From physics, THz wave is in the zone of transition of electronics to photonics; From frequency domain, the important frequencies scope such as frequency of the characteristic frequency of plasma wave, the organic and rotation and vibration frequency of biomacromolecule, the cosmic space photon of about 50% in the frequency coverage of THz wave semiconductor; From application point, THz wave has bandwidth, energy is little, coherence is strong, measure signal to noise ratio (S/N ratio) high, is suitable for the various fields such as material characteristics sign, high-resolution imaging, medical diagnosis, safety check, information communication, radar detection, air and environment measuring.Therefore, THz wave has important application prospect in national economy and national security etc.
Terahertz has very strong penetrability, can penetrate clothing easily, and human body self can produce this electromagnetic wave and to external radiation, therefore, Terahertz human body safety check scanning mechanism is developed.Terahertz human body safety check scanning mechanism is the THz wave sent by passive reception human body, after treated conversion, forms the two-dimentional Terahertz " snapshot " of human body.When being concealed with article in thing that people wears the clothes, absorb and stopped the normal trace of THz wave, make to produce intensity contrast between the position at corresponding article place in " snapshot " and human body background, thus find out the existence of article, and show the shape of article and the position at its place on a display screen.
Terahertz human body safety check scanning mechanism is compared with conventional body's safety check means, has four characteristics:
(1) safer.Traditional safety check instrument generally adopts X ray initiatively emission detection, and Terahertz safety check instrument is then the electromagnetic wave that passive acceptance sends from human body self, and equipment itself does not exist any ionization or electromagnetic radiation, is perfectly safe to detected personnel.
(2) more reliable.Traditional safety check instrument is mainly used in metallics detection, and Terahertz safety check instrument not only can detect metallics, can also detect the nonmetallic substance that the person carries, as pottery, powder, liquid, colloid etc.
(3) more civilized.Equipment Inspection mode is contactless inspection, and tested personnel need not undress, and testing result does not show any physical trait details, and adequately protect tested personnel's individual privacy.
Fig. 1 shows physical construction and the scanning theory of existing a kind of Terahertz human body safety check scanning mechanism: comprise pendulum mirror 11, concave mirror 12, lead screw motor 14, screw mandrel 15, swing mirror bracket 16, luffing mechanism 17 etc.The THz wave that human body 10 sends, being reflexed to its oblique upper by the pendulum mirror 11 of the one side circle swung has on the concave mirror 12 of optically focused effect, then terahertz detector 13 (having 1-3) institute's perception of concave mirror 12 focal position is located at, form the capable pixel of 1-3, pendulum mirror 11 drives generation luffing by lead screw motor 14, completes the scanning of the top-down whole height of human body; Large number of rows pixel stacks up, and forms complete scan image.
In order to improve sweep velocity, this Terahertz human body safety check scanning mechanism physical construction has had a kind of pattern of upgrading, be mirrored by physical construction and be copied into identical two covers up and down, be responsible for the scanning of the upper part of the body and the lower part of the body separately, then upper and lower scanning result is superimposed as a width complete image.Due to all doubling with number of optical devices of all parts, comprising motor and screw mandrel and driver is also all independently upper and lower two covers, therefore complicated in mechanical structure, with high costs.In addition, pendulum mirror adopts reciprocating swing form, feature there is acceleration-deceleration to zero, and then heterodromous process, acceleration of motion is large, if mechanism can not do enough light and handy, inertia is large, vibration is large, and speed also cannot improve, and pendulum scarnning mirror speed obviously strengthens the problems such as even motor overload warning once raising there will be leading screw noise.
And the formation method of existing Terahertz human body safety check scanning mechanism is next direct stacking pixel of lining by line scan, and there is anamorphose large, image blur, the problem that resolution is low.
In addition, current terahertz detector is in continuous working after a period of time, its output voltage there will be drift, this needs suspend body scans and guarantee that scanning area does not detect thing, under being switched to calibration mode, the soft-key button clicking calibration carries out manual calibration, just can work on after calibration.The interval of calibration of this calibrating mode is long, cannot solve the situation that detector drift occurs in the process of single pass.
Summary of the invention
For solving the problems of the technologies described above, the invention provides that a kind of sweep velocity is high, vibration and noise little, image is clear, it is little to be out of shape and the Terahertz human body safety check method that resolution is high, to overcome the deficiency that prior art exists.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of Terahertz human body safety check method, is characterized in that: the process of described method is:
To rotate in human body front and level swings back and forth a drum-type multiaspect reflecting rotating mirror, receive the next THz wave of described drum-type multiaspect reflecting rotating mirror reflection with concave mirror and focus on to terahertz detector, the anglec of rotation of drum-type multiaspect reflecting rotating mirror described in real time record and pendulum angle;
Set up each group of anglec of rotation of drum-type multiaspect reflecting rotating mirror and the one-to-one relationship of pendulum angle and each pixel coordinate of scan image;
The terahertz signal detected corresponding to each group of anglec of rotation and pendulum angle is changed into image intensity value and is filled into each pixel of respective coordinates point by point thus forms complete scanned image.
In the specific embodiment of the present invention, described drum-type multiaspect reflecting rotating mirror is placed on centre position, human body front, described concave mirror has two, place the front oblique upper of drum-type multiaspect reflecting rotating mirror and front oblique below respectively, be respectively used to the THz wave receiving upper half of human body and lower part of the body generation.
Described drum-type multiaspect reflecting rotating mirror is drum-type six reflecting rotating mirrors.
The rotational speed of described drum-type multiaspect reflecting rotating mirror and the relative speed of hunting frequency adjustable, preferably often swing back and forth once rotate 27 circle.。
In order to the output voltage offset problem of terahertz detector can be overcome, in human body safety check method of the present invention, every block plane mirror of described drum-type multiaspect reflecting rotating mirror is allowed to complete after to body scans, also the region outside human body is scanned, control terahertz detection calibrate according to terahertz wave signal cannot be received in the region of terahertz detector outside human body.Due to calibration frequency be often rotate a Surface scan human body after calibrate once, be equivalent to complete in real time in single pass process, and do not need the working time outside occupying volume.
Adopt technique scheme, Terahertz human body safety check method of the present invention have sweep velocity high, vibration and noise little, image is clear, be out of shape little and that resolution is high advantage, and achieve run-down and just carry out the calibration of a terahertz detector in real time, do not need the working time outside occupying volume, ensure that human body safety check can long-time continuous carry out.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail:
Fig. 1 is the structural representation of the Terahertz human body safety check scanning mechanism safety check scanning mechanism of prior art;
Fig. 2 is the structural representation of Terahertz human body safety check scanning mechanism of the present invention;
Fig. 3 is the structural representation of drum-type multiaspect reflecting rotating mirror, and its inside is provided with rotating driving device;
Fig. 4 is the structural representation of horizontal hunting drive unit;
Fig. 5 is control principle schematic diagram of the present invention.
Embodiment
Terahertz human body safety check method of the present invention, its safety check process is:
To rotate in human body front and level swings back and forth a drum-type multiaspect reflecting rotating mirror, receive the next THz wave of described drum-type multiaspect reflecting rotating mirror reflection with concave mirror and focus on to terahertz detector, the anglec of rotation of drum-type multiaspect reflecting rotating mirror described in real time record and pendulum angle;
Set up each group of anglec of rotation of drum-type multiaspect reflecting rotating mirror and the one-to-one relationship of pendulum angle and each pixel coordinate of scan image;
The terahertz signal detected corresponding to each group of anglec of rotation and pendulum angle is changed into image intensity value and is filled into each pixel of respective coordinates point by point thus forms complete scanned image.
Wherein, the preferred drum-type of drum-type multiaspect reflecting rotating mirror six reflecting rotating mirrors, this drum-type multiaspect reflecting rotating mirror is placed on centre position, human body front, concave mirror has two, place the front oblique upper of drum-type multiaspect reflecting rotating mirror and front oblique below respectively, be respectively used to the THz wave receiving upper half of human body and lower part of the body generation.
In the present embodiment, the relativeness of the preferred rotational speed of drum-type multiaspect reflecting rotating mirror and hunting frequency once rotates 27 circles for often swinging back and forth.
In order to the output voltage offset problem of terahertz detector can be overcome, every block plane mirror of described drum-type multiaspect reflecting rotating mirror is allowed to complete after to body scans, also the region outside human body is scanned, control terahertz detection calibrate according to terahertz wave signal cannot be received in the region of terahertz detector outside human body.Due to calibration frequency be often rotate a Surface scan human body after calibrate once, be equivalent to complete in real time in single pass process, and do not need the working time outside occupying volume, ensure that human body safety check can long-time continuous carry out.
For above-mentioned drum-type six reflecting rotating mirrors, each plane mirror run-down is rotation 60 degree, wherein human body can be scanned within the scope of 0-26 °, analyzing spot is in imaging region interscan, receive the terahertz wave signal that human body sends, can utilize and collect terahertz wave signal and carry out image reconstruction.When plane mirror rotates over 26 °, analyzing spot moves to outside imaging region thereupon, and arrive a region, the THz wave of human-body emitting can well be blocked due to the shielding action of Scan Architecture in this region, terahertz detector cannot detect terahertz wave signal, thus controls the drift being used for calibration detectors self.
For realizing above-mentioned Terahertz human body safety check method, Terahertz human body safety check scanning mechanism scanning mechanism adopts following structure:
As shown in Figures 2 and 3, be made up of frame 100, drum-type multiaspect reflecting rotating mirror 200, upper recess surface mirror 301, concave surface mirror 302, terahertz detector 303, rotary drive mechanism 400, horizontal hunting drive unit 500.
Wherein, frame 100 by four discrete growth rectangular frames column 101, be located at top ceiling 102 and be located at bottom base station 103 form.
In the present embodiment, drum-type multiaspect reflecting rotating mirror 200 is drum-type six reflecting rotating mirrors, level is arranged on the middle part of frame 100, forms by hexahedral mirror holder 201 with around being arranged on six pieces of end to end plane mirrors 202 in mirror holder 201 circumference six planes.Rotary drive mechanism 400 is positioned at mirror holder 201.
Shown in Fig. 2 composition graphs 4, horizontal hunting drive unit 500 is made up of swing motor 501, cage horizontal pendulum moving frame 502, toggle 503.Toggle 503 is made up of rotating disk 531 and connecting rod 532.
Back up pad 511 is fixed with between two root posts at frame 100 rear portion, back up pad 511 is fixed with backing plate 512, be connected with the end plate 513 vertical with backing plate 512 in the lower end of backing plate 512, swing motor 501 is fixed on below end plate 513, and its output shaft is upward through end plate 513.The top of backing plate 512 is fixed with clutch shaft bearing seat 514, the first rotating shaft is provided with in this bearing seat 514, the upper end of the first rotating shaft is connected to the center of rotating disk 531, and lower end connects the output shaft of swing motor 501 by shaft coupling, and swing motor 501 is also provided with the first scrambler 517.One end hinge of connecting rod 532 is at the off-centered card edge of rotating disk 531.
Again shown in Fig. 2, cage horizontal pendulum moving frame 502 entirety is diamond structure, has the end frame 521 of upper and lower rhombus, is connected to many support bars 522 between upper and lower end frame 521 and middle part connects many support bars 522 and the fixed frame of front opening forms 523.
Respectively up and down between two root posts of frame 100 front portion fix a crossbeam 520.The front end of the upper and lower end frame of cage horizontal pendulum moving frame 502 respectively has axle portion 524, be hubbed on the center on upper and lower crossbeam respectively and form the oscillation centre of cage horizontal pendulum moving frame 502, the other end hinge of connecting rod 532 is in the side margins of lower end frame 521.
Again as shown in Figure 3, be fixed with the back shaft 203 of horizontally set between in the middle part of the supported on both sides bar 522 of cage horizontal pendulum moving frame 502 by fixture block 5221, the mirror holder 201 of drum-type six reflecting rotating mirrors is arranged on back shaft 203, can roll around back shaft 203.
Rotary drive mechanism 400 is arranged on the inside of mirror holder 201, rolls around back shaft 203 for driving mirror holder 201.Rotary drive mechanism 400 comprises base 401, the rotating shaft of rotation motor 402, second bearing seat 403, second, the second scrambler 406, driving gear 407 and follower gear 408.Wherein, rotation motor 402 and the second bearing seat 403 are fixed in base 401, second rotating shaft 404 is arranged in the second bearing seat 403, its one end is connected with the output shaft of rotation with motor 402 front end by shaft coupling, the other end installs driving gear 407, and follower gear 408 is fixed on one of them end face inside of mirror holder 201 and engages with driving gear 407.Second scrambler 406 is arranged on the output shaft of rotation motor 402 rear end.Like this, by the driving of rotation with stepper motor 402, drum-type six reflecting rotating mirrors can be made to roll around back shaft 203.
Again shown in Fig. 2, upper recess surface mirror 301 to be fixed on ceiling 102 and to be positioned at the front oblique upper of drum-type six reflecting rotating mirrors, and concave surface mirror 302 to be fixed on base station 103 and to be positioned at the front oblique below of drum-type six reflecting rotating mirrors.Terahertz detector 303 has two, and one of them terahertz detector to be fixed on ceiling 102 and to be positioned at the focal position of upper recess surface mirror 301, and another terahertz detector to be fixed on base station 103 and to be positioned at the focal position of concave surface mirror 302.
Above-mentioned swing motor 501 and rotation motor 402 preferably adopt stepper motor.
The anterior position that base station 103 is positioned at frame 100 is also provided with the platform 104 of standing for tested personnel.
In the middle of this Terahertz human body safety check scanning mechanism adopts, drum-type six reflecting rotating mirrors of traverse solve the scanning of upper half of human body and the lower part of the body, instead of the upper lower part of the body scanning of human body was responsible for by picture with the duplicate light path system of upper and lower two cover in the past, the feature of width is greater than according to human height's size, and the feature that drum-type six reflecting rotating mirror rolling rotational scan range are large, original single mirror left and right reciprocally swinging scanning many minute surfaces become around its axle center rotation are scanned up and down, like this, many mirrors are become from single mirror, to-and-fro movement becomes continuous rotary motion, thus reach efficiency and significantly improve with smooth running without impact, be easy to the object raised speed, and noise is low.
The circumferential each face of hexahedral mirror holder 201 is provided with plane mirror, and by rotation, with motor head roll formula six reflecting rotating mirrors, around axle center, rolling rotates.The effect of the concave surface mirror of drum-type six reflecting rotating mirror front oblique upper upper recess surface mirrors and position, front lower place is the human body THz wave receiving each mirror-reflection, focus on the terahertz detector at respective concave mirror focus place respectively, upper recess surface mirror and concave surface mirror are responsible for above the waist and the light of the lower part of the body separately, form the scanning of a row human body full-height.Drum-type six reflecting rotating mirrors, from left swing to the right side, just complete the scanning of human body Width, and next time, scanning then put a left side again from the right side, completed the scanning of lower next human body Width; The swing of drum-type six reflecting rotating mirrors is reached with motor driving crank linkage assembly by swinging; Higher than the efficiency of the straight reciprocating motion of screw mandrel, speed is fast, and structure is simple, and cost is low.
As shown in Figure 5, rotation motor 402 in Terahertz human body safety check scanning mechanism 01, swing motor, upper terahertz detector 3031, lower terahertz detector 3032, first scrambler 517, second are compiled scrambler 406 and are all connected with control circuit board 02, controller circuit board 02 connects industrial computer 03 again, and image display 04 is also connected with industrial computer 03 with alarm 05.
Wherein, the function of control circuit board 02 controls electric rotating machine 402 and swing motor 501 to carry out head roll formula multiaspect reflecting rotating mirror 200 and rotate and swung body scans, gather the terahertz wave signal data of terahertz detector and the angle-data of scrambler and transmit data to industrial computer, and the function of industrial computer 03 is rebuild image, identifies dangerous goods and report to the police by image procossing.
By foregoing detailed description, can find out that Terahertz human body safety check method tool of the present invention has the following advantages:
1, high, the vibration of sweep velocity and noise is little, structure is simple, low cost of manufacture.
2, all pixels comprising angle-data (anglec of rotation and pendulum angle) are carried out synthesis superposition and Screening Treatment, the picture quality after completing, direct stacking pixel after comparing existing lining by line scan, quality has and significantly improves.
3, achieving scanning once arranging the calibration carrying out a terahertz detector in real time, not needing the working time outside occupying volume, ensure that human body safety check can long-time continuous carry out.
Claims (5)
1. a Terahertz human body safety check method, is characterized in that: the process of described method is:
To rotate in human body front and level swings back and forth a drum-type multiaspect reflecting rotating mirror, receive the next THz wave of described drum-type multiaspect reflecting rotating mirror reflection with concave mirror and focus on to terahertz detector, the anglec of rotation of drum-type multiaspect reflecting rotating mirror described in real time record and pendulum angle;
Set up each group of anglec of rotation of drum-type multiaspect reflecting rotating mirror and the one-to-one relationship of pendulum angle and each pixel coordinate of scan image;
The terahertz signal detected corresponding to each group of anglec of rotation and pendulum angle is changed into image intensity value and is filled into each pixel of respective coordinates point by point thus forms complete scanned image.
2. Terahertz human body safety check method according to claim 1, it is characterized in that: described drum-type multiaspect reflecting rotating mirror is placed on centre position, human body front, described concave mirror has two, place the front oblique upper of drum-type multiaspect reflecting rotating mirror and front oblique below respectively, be respectively used to the THz wave receiving upper half of human body and lower part of the body generation.
3. Terahertz human body safety check method according to claim 1, is characterized in that: described drum-type multiaspect reflecting rotating mirror is drum-type six reflecting rotating mirrors.
4. Terahertz human body safety check method according to claim 1, is characterized in that: described drum-type multiaspect reflecting rotating mirror often swings back and forth and once rotates 27 circles.
5. Terahertz human body safety check method according to claim 1, it is characterized in that: allow every block plane mirror of described drum-type multiaspect reflecting rotating mirror complete after to body scans, also the region outside human body is scanned, control terahertz detection calibrate according to terahertz wave signal cannot be received in the region of terahertz detector outside human body.
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| CN105467885A (en) * | 2016-01-18 | 2016-04-06 | 上海理工大学 | Automatic human body safety detector |
| CN108008449A (en) * | 2017-05-23 | 2018-05-08 | 广州群彧机械有限公司 | A kind of new detector |
| CN109444978A (en) * | 2018-12-29 | 2019-03-08 | 清华大学 | Millimeter wave/THz wave imaging device and detection method to human body or article |
| CN109633776A (en) * | 2018-12-29 | 2019-04-16 | 同方威视技术股份有限公司 | Millimeter wave/THz wave imaging device and human body or article detection method |
| CN109828313A (en) * | 2018-12-29 | 2019-05-31 | 清华大学 | Millimeter wave/THz wave imaging device and detection method to human body or article |
| CN109856696A (en) * | 2018-12-29 | 2019-06-07 | 同方威视技术股份有限公司 | Millimeter wave/THz wave imaging device and human body or article detection method |
| CN109870738A (en) * | 2018-12-29 | 2019-06-11 | 清华大学 | Millimeter wave/THz wave imaging device and its bearing calibration |
| WO2020134333A1 (en) * | 2018-12-29 | 2020-07-02 | 同方威视技术股份有限公司 | Millimeter wave/terahertz wave imaging equipment and human or object detecting method |
| CN112394421A (en) * | 2019-08-15 | 2021-02-23 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Terahertz human body security inspection method, system, medium and equipment |
| CN113625351A (en) * | 2021-08-17 | 2021-11-09 | 上海亨临光电科技有限公司 | Method for feeding back voltage value of detector channel |
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Address after: 201209 Chuansha Road, Shanghai, No. 221, room 11, building 955 Applicant after: Bocom Intelligent Network Technology Co. Ltd. Address before: 201209 Chuansha Road, Shanghai, No. 221, room 11, building 955 Applicant before: BOCOM Smart Network Technologies Inc. |
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Application publication date: 20150916 |