CN207798670U - Terahertz imaging instrument - Google Patents
Terahertz imaging instrument Download PDFInfo
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- CN207798670U CN207798670U CN201721670886.6U CN201721670886U CN207798670U CN 207798670 U CN207798670 U CN 207798670U CN 201721670886 U CN201721670886 U CN 201721670886U CN 207798670 U CN207798670 U CN 207798670U
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Abstract
The utility model provides a kind of terahertz imaging instrument, including：First convergence apparatus, Terahertz narrow band filter slice, terahertz camera and at least one THz wave generation device；At least one THz wave generation device is used to generate the THz wave of preset energy grade, Terahertz narrow band filter slice, the first convergence apparatus and terahertz camera are arranged in the transmission path of THz wave, and THz wave converges to terahertz camera through the first convergence apparatus；Terahertz narrow band filter slice is arranged between the THz wave generation device and first convergence apparatus or is arranged between first convergence apparatus and the terahertz camera, and the Terahertz narrow band filter slice is used to obtain the THz wave of default wave band.Object under test corresponding image at a certain peak wavelength can be quickly obtained, corresponding image at multiple and different peak wavelengths can also be quickly obtained, and have the advantages of simple structure and easy realization, can be widely applied to the key areas such as safety check.
Description
Technical field
The utility model is related to terahertz optics technical fields, more particularly, to terahertz imaging instrument.
Background technology
THz imaging technology is the key components in Terahertz science and technology.Since terahertz emission is located at electricity
The typical case value of a particular frequency bands in electromagnetic spectrum between microwave and infrared light, the frequency range terahertz emission is
Its spectrum.Because the energy level of the weak interactions such as the vibration of many materials and rotational energy level and intermolecular hydrogen bond exists
The frequency range, therefore, tera-hertz spectra can provide " Fingerprint " of material, can be used for the imaging of substance.For imaging source
For, traditional x-ray possesses photon energy height, has the side effects such as ionising radiation to substance, leads to not be imaged for human body.
For visible light and infrared imaging system, the wavelength for the THz wave that terahertz emission is formed is longer, has better
Penetration capacity, lower transmission loss can be used for the imaging applications of the complex environments such as dense smoke, dust, can penetrate wall to house
Inside is scanned.For millimeter wave, the frequency higher of THz wave, wavelength is shorter, can get higher imaging space
Resolution capability.THz wave has good penetration capacity to fur, clothing, paper etc., and to metal and water isopolarity liquid
Penetration capacity is very poor.Therefore, terahertz imaging can be used for the objects such as plastics lethal weapon, ceramic pistol, fluid bomb, body bombs
Detection and identification.Meanwhile THz wave can be additionally used in the mine fields distribution of long-range detection underground.
In addition, THz wave corresponds to the weaker energy such as vibration and rotation of biomolecule, the spy of corresponding biomolecule
Energy level is levied, many substances have characteristic spectrum in Terahertz frequency range, therefore can be combined with imaging, realize special spectroscopy imaging
Function, i.e., while imaging, moreover it is possible to realize the discriminating to substance, it is latent to possess prodigious application in security protection human body imaging etc.
Energy.
In the prior art, THz imaging technology is applied to non-destructive testing, drug surveillance, the mail inspection of foam
Survey, explosive identification etc..Most of terahertz imaging system is all made of the mode of mechanical scanning, and scanned object under test is put
It sets on a two-dimensional movement translation stage, measuring targets point by point scanning.The mode of this mechanical scanning limit Terahertz at
The speed of picture.It is 100 × 100mm for a size2By imaging region or object under test, be to obtain imaging resolution
The image of 0.25mm takes around 6 minutes.Real-time terahertz imaging system can be by using the side of focal plane array detector
Formula realizes, but such system complexity higher and of high cost, and needs the Terahertz generating means of high brightness.It is based on
The mode of power generating type sensor can realize the terahertz imaging of video rate (video rate normally is in 30 frames or so), but
Need huge and expensive amplifying stage femto-second laser.
Utility model content
Solve the above problems in order to overcome the problems referred above or at least partly, the utility model provide a kind of Terahertz at
As instrument.
On the one hand, the utility model provides a kind of terahertz imaging instrument, including：First convergence apparatus, Terahertz narrowband
Filter plate, terahertz camera and at least one THz wave generation device；
At least one THz wave generation device is used to generate the THz wave of preset energy grade, and the Terahertz is narrow
It is arranged in the transmission path of the THz wave with filter plate, first convergence apparatus and the terahertz camera, institute
It states THz wave and converges to the terahertz camera through first convergence apparatus；
The Terahertz narrow band filter slice is arranged between the THz wave generation device and first convergence apparatus
Or be arranged between first convergence apparatus and the terahertz camera, the Terahertz narrow band filter slice is pre- for obtaining
If the THz wave of wave band.
Preferably, the imager further includes the first collimator apparatus；
First collimator apparatus is arranged in the transmission path of the THz wave, and is arranged and is produced in the THz wave
Between generating apparatus and first convergence apparatus, first collimator apparatus collimates the THz wave, collimated
THz wave converged on the terahertz camera using first convergence apparatus.
Preferably, the imager includes multiple Terahertz narrow band filter slices, the multiple Terahertz narrow band filter slice
It is arranged in fixed plate；
Through-hole identical with the Terahertz narrow band filter slice quantity is provided in the fixed plate, each through-hole is for solid
A fixed Terahertz narrow band filter slice；
The fixed plate is vertically set in the transmission path of the THz wave.
Preferably, further include in the imager：Electric rotating machine, the fixed plate are connect with the electric rotating machine.
Preferably, the fixed plate is round fixed plate, be along the circumferential direction provided in the circle fixed plate with it is described
The identical through-hole of Terahertz narrow band filter slice quantity；
Each through-hole is along the radial direction setting of the round fixed plate, and every two adjacent through-holes and the circle are fixed
Angle between plate circle center line connecting is equal.
Preferably, further include in the imager：Second collimator apparatus and the second convergence apparatus；
The THz wave is converged to through first convergence apparatus in a focus of second collimator apparatus, and is passed through
Be incident on second convergence apparatus after second collimator apparatus collimation, through second convergence apparatus converge to it is described too
On hertz camera.
Preferably, first collimator apparatus, the first convergence apparatus, the second collimator apparatus and the second convergence apparatus are
Mirror；
Or first collimator apparatus, the first convergence apparatus, the second collimator apparatus and the second convergence apparatus are off-axis throwing
Object plane mirror.
Preferably, the THz wave generation device includes：Grating, half-wave plate, imaging unit and lithium columbate crystal；
The grating is irradiated using pumping femtosecond laser, and by the optical grating diffraction to the half-wave plate, by institute
After stating the polarization direction that half-wave plate changes the pumping femtosecond laser, then by being incident to the lithium niobate after the imaging unit
On crystal.
Preferably, the pumping femtosecond laser is generated by all solid state femto-second laser or optical fiber femtosecond laser.
Preferably, the repetition rate of all solid state femto-second laser or optical fiber femtosecond laser is numerically not less than institute
State the velocity of rotation of electric rotating machine.
Terahertz imaging instrument provided by the utility model, by combining THz wave generation device, the first convergence apparatus, too
Hertz narrow band filter slice and terahertz camera, can quickly obtain object under test corresponding image at a certain peak wavelength,
Corresponding image at multiple and different peak wavelengths can also be quickly obtained, and is had the advantages of simple structure and easy realization, can be widely applied to
The key areas such as safety check.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram of the terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 3 is a kind of structural schematic diagram of the terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 4 is a kind of structural schematic diagram of the terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 5 is a kind of structural schematic diagram of the terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 6 is a kind of structural schematic diagram of the terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 7 is the structural schematic diagram of fixed plate in a kind of terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 8 is a kind of structural schematic diagram of the terahertz imaging instrument provided in one embodiment of the utility model；
Fig. 9 is the knot of THz wave generation device in a kind of terahertz imaging instrument provided in one embodiment of the utility model
Structure schematic diagram；
Figure 10 is THz wave generation device in a kind of terahertz imaging instrument provided in one embodiment of the utility model
Structural schematic diagram.
Specific implementation mode
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
As depicted in figs. 1 and 2, a kind of terahertz imaging instrument is provided in one embodiment of the utility model, including：First meeting
Poly- device 12, Terahertz narrow band filter slice 13, terahertz camera 14 and at least one THz wave generation device 11；
At least one THz wave generation device 11 is used to generate the THz wave of preset energy grade, the Terahertz
Narrow band filter slice 13, the first convergence apparatus 12 and terahertz camera 14 are arranged in the transmission path of the THz wave, institute
It states THz wave and converges to terahertz camera 14 through first convergence apparatus 12；
The Terahertz narrow band filter slice 13 is arranged in the THz wave generation device 11 and first convergence apparatus
Between 12 or it is arranged between first convergence apparatus 12 and the terahertz camera 14, the Terahertz narrow band filter slice
13 THz wave for obtaining default wave band.
Specifically, need use that can generate pre- to improve the image quality of terahertz camera 14 in the utility model
If the THz wave generation device 11 of the THz wave of energy level.Here, preset energy grade is at least micro- burnt magnitude.That is Terahertz
The energy of wave has at least up to micro- burnt magnitude, just can guarantee the image quality of terahertz camera.THz wave generation device
11 THz waves generated are made of a large amount of terahertz pulse, include extensive frequency in each terahertz pulse
Range can cover Terahertz full frequency band.Property of the THz wave with high-energy, high speed, this will promote entire imager
Image taking speed.The THz wave of preset energy grade refers to that each Terahertz impulse energy is preset energy grade in THz wave.
Arrow direction in Fig. 1 and Fig. 2 indicates the direction of propagation of THz wave.It should be noted that being merely represented in figure
Relative position relation in transmission path between each device is not offered as the physical location of each device.
In the utility model, a Terahertz narrow band filter slice can be set, or too in high energy terahertz imaging instrument
Multiple Terahertz narrow band filter slices are set on the same position of Hertz wave transmission path, these Terahertz narrow band filter slices constitute one
A Terahertz narrow-band filtering chip arrays perpendicular to transmission path.It should be noted that since Terahertz narrow band filter slice can only
Allow the THz wave of a wavelength range to pass through, i.e., the THz wave of default wave band can only be allowed to pass through, can make final obtain
To the image corresponding image that is object under test at the peak wavelength of default wave band.When need obtain object under test at different peaks
It is worth corresponding image at wavelength, a Terahertz narrow band filter slice can be only set in the transmission path of THz wave, at this time
It needs to replace different Terahertz narrow band filter slices manually, to obtain object under test corresponding image at multiple peak wavelengths.
One Terahertz narrow-band filtering chip arrays, this time-division two different situations can also be set in the transmission path of THz wave
It may be implemented, one is the hot spots formed on Terahertz narrow-band filtering chip arrays when THz wave can cover entire Terahertz
When narrow-band filtering chip arrays, need to ensure that the photosurface area of terahertz camera 14 is sufficiently large, at least THz wave is in terahertz
It is corresponding at multiple peak wavelengths directly can to obtain object under test simultaneously at this time for the size of the hot spot hereby formed on camera 14
Image.The hot spot also formed on Terahertz narrow-band filtering chip arrays one is THz wave is smaller, and it is entire to be not enough to covering
When Terahertz narrow-band filtering chip arrays, it can be filtered at this time first with a Terahertz narrowband in Terahertz narrow-band filtering chip arrays
Wave plate chooses the wave-length coverage of THz wave, then electric rotating machine is utilized to drive entire Terahertz narrow-band filtering chip arrays
Rotation, when electric rotating machine drives Terahertz narrow-band filtering chip arrays one circle of rotation, you can obtain object under test in multiple peak values
Corresponding image at wavelength.
The range of wave band is preset in the present embodiment to be determined by the build-in attribute of each Terahertz narrow band filter slice, can basis
The selection suitably corresponding Terahertz narrow band filter slice of default wave band is needed, is not illustrated in the utility model.
The terahertz camera used in the present embodiment has high sensitivity, to ensure that the hot spot of THz wave can be in terahertz
Better image quality is hereby obtained on camera.
Here the first convergence apparatus 12 can be chosen as needed, and lens or off axis paraboloidal mirror may be selected.This
In it should be noted that the THz wave that THz wave generation device 11 generates is divergent beams, to make THz wave through the
One convergence apparatus, 12 post-concentration needs on terahertz camera by the THz wave exit window on THz wave generation device 11
It is arranged other than one times of focal length of the first convergence apparatus.At this point, if necessary to using the terahertz imaging instrument measuring targets into
When row imaging, object under test is placed on to the position close to terahertz camera in the transmission path of THz wave.
It, can be respectively by least two terahertzs when terahertz imaging instrument includes at least two THz wave generation device 11
Hereby wave generation device 11 is arranged big in distance parallel with the focal plane of the first convergence apparatus 12 and the first convergence apparatus of distance 12
In in the plane of one times of focal length, and make the THz wave that at least two THz wave generation devices 11 generate through the first meeting
Poly- device 12 is focused on the different location of terahertz camera 14, can obtain the image of object under test different location simultaneously.It is this
Method is suitable for the case where object under test is larger, once irradiating is not enough to generate complete image.
In the present embodiment, by combine THz wave generation device, the first convergence apparatus, Terahertz narrow band filter slice and
Terahertz camera can quickly obtain object under test corresponding image at a certain peak wavelength, can also quickly obtain multiple
Corresponding image at different peak wavelengths, and have the advantages of simple structure and easy realization, it can be widely applied to the key areas such as safety check.
On the basis of the above embodiments, in terahertz imaging instrument further include the first collimator apparatus；
First collimator apparatus is arranged in the transmission path of the THz wave, and is arranged and is produced in the THz wave
Between generating apparatus and first convergence apparatus, first collimator apparatus collimates the THz wave, collimated
THz wave converged on the terahertz camera using first convergence apparatus.
Specifically, as shown in figure 3, the first collimator apparatus 21 is arranged in the THz wave generation device 11 and described first
It, can also be as shown in figure 4, by the setting of the first collimator apparatus 21 in the THz wave generation device 11 and too between convergence apparatus 12
Between hertz narrow band filter slice 13, also can as shown in figure 5, by the setting of the first collimator apparatus 21 Terahertz narrow band filter slice 13 with
Between first convergence apparatus 12.It should be noted that the first collimator apparatus 21, the first convergence apparatus 12 and Terahertz narrow-band filtering
Piece 13 is arranged in the transmission path of THz wave.Arrow direction in Fig. 3, Fig. 4 and Fig. 5 indicates the propagation side of THz wave
To.The relative position relation of each device on the transmit path in figure, is not offered as the physical location of each device.
First collimator apparatus 21 collimates the THz wave, and collimated THz wave is using described first
Convergence apparatus 12 converges on the terahertz camera 14.Here, it in order to realize collimation and convergence, needs to generate THz wave
THz wave exit window on device 11 is arranged in a focus of the first collimator apparatus 21, makes by the first collimator apparatus
21 THz wave becomes collimated light beam by divergent beams.Collimated light beam converges to terahertz camera through the first convergence apparatus 12 again
On 14.In this course, the position of Terahertz narrow band filter slice 13 does not interfere with the first collimator apparatus 21 or the first meeting
Adjustment of the poly- device 12 to light beam.
As shown in fig. 6,15 being object under test in figure, object under test 15 is set to Terahertz narrow band filter slice 13 and the first meeting
Between poly- device 12.
In the present embodiment, to realize that the terahertz imaging instrument of high speed provides different structures, and due to adding the
One collimator apparatus, is substantially shorter the length of entire light path, and then reduces the size of imager.
On the basis of the above embodiments, the imager includes multiple Terahertz narrow band filter slices, it is the multiple too
Hertz narrow band filter slice is arranged in fixed plate；
Through-hole identical with the Terahertz narrow band filter slice quantity is provided in the fixed plate, each through-hole is for solid
A fixed Terahertz narrow band filter slice；
The fixed plate is vertically set in the transmission path of the THz wave.
Specifically, it is larger to be applicable to the hot spot that THz wave is formed on Terahertz narrow-band filtering chip arrays for the present embodiment
And the case where when can cover multiple Terahertz narrow band filter slices simultaneously, multiple Terahertz narrow band filter slices are uniformly arranged at this time
In fixed plate.Preferably, fixed plate can be provided in round, concrete structure can be with as shown in fig. 7, but be not limited to
This.Through-hole identical with the Terahertz narrow band filter slice quantity, each through-hole are along the circumferential direction provided in round fixed plate
For fixing a Terahertz narrow band filter slice.Each through-hole is arranged along the radial direction of round fixed plate, and each two is adjacent logical
Angle between hole and the round fixed plate circle center line connecting is equal, that is, realizes that Terahertz narrow band filter slice is evenly distributed on fixation
On plate.
The quantity of Terahertz narrow band filter slice can as needed and each Terahertz narrow band filter slice allow by wave
Duan Jinhang suitably chooses.
On the basis of the above embodiments, further include in the imager：Electric rotating machine, the fixed plate and the rotation
Motor connects.
Specifically, it is smaller to be applicable to the hot spot that THz wave is formed on Terahertz narrow-band filtering chip arrays for the present embodiment
And the case where when cannot cover multiple Terahertz narrow band filter slices simultaneously, multiple Terahertz narrow band filter slices are uniformly arranged at this time
In fixed plate.Preferably, fixed plate can be provided in round, fixed form can also be as shown in Figure 7.Unlike,
In a particular application, the THz wave that THz wave generation device 11 generates can penetrate the filter of a Terahertz narrowband in fixed plate
On wave plate, fixed plate is driven to carry out high speed rotation by electric rotating machine, fixed plate drives Terahertz narrow band filter slice high speed thereon
Rotation, and then realize the fast imaging of THz wave.For the electric rotating machine used in the present embodiment for high-speed electric expreess locomotive, rotating speed is reachable
10000 revolutions per seconds, i.e. electric rotating machine every 10-4Second rotation one week.
In the utility model, the speed that Terahertz image is generated in imager depends on the rotating speed of electric rotating machine, and rotating speed is got over
Greatly, the speed for generating the image of object under test is faster.It, can due to being provided with Terahertz narrow-band filtering chip arrays in the present embodiment
Be quickly obtained the image of object under test at multiple peak wavelengths, and can quickly obtain different peak wavelengths and imager at
Relationship between image quality amount and contrast, is convenient for follow-up study.
On the basis of the above embodiments, the imager further includes：Second collimator apparatus and the second convergence apparatus；
The THz wave is converged to through first convergence apparatus in a focus of second collimator apparatus, and is passed through
Be incident on second convergence apparatus after second collimator apparatus collimation, through second convergence apparatus converge to it is described too
On hertz camera.
Specifically, when specific measuring targets are imaged, object under test can be arranged in the first convergence apparatus and the
Between two collimator apparatus.
It, can be by first collimator apparatus, first since lens have the function of collimated ray and assemble the function of light
Convergence apparatus, the second collimator apparatus and the second convergence apparatus are disposed as lens；It can also be by first collimator apparatus, first
Convergence apparatus, the second collimator apparatus and the second convergence apparatus are disposed as off axis paraboloidal mirror.
What needs to be explained here is that the collimation of lens and convergence, which are required to THz wave, penetrates lens, belong to transmission-type, from
The collimation of axis paraboloidal mirror and convergence are then reflective.It can also be mixed with off axis paraboloidal mirror using lens in the present embodiment
It uses.
On the basis of the above embodiments, the imager can also include：Multiple collimator apparatus and multiple convergence apparatus,
After multiple collimator apparatus and multiple convergence apparatus may be provided at the second convergence apparatus, repeatedly THz wave is collimated and understood
It is poly-, further reduce the size of imager.
As shown in figure 8, the first collimator apparatus 21, the first convergence apparatus 12, the second collimator apparatus 71 and the second convergence apparatus
72 be off axis paraboloidal mirror.Object under test 15 setting the first convergence apparatus 12 and second collimation fill 71 set between.This practicality
In novel, the off axis paraboloidal mirror used has the characteristics that large aperture, short focus.Specifically, it is 3 English that aperture size, which may be selected,
The off axis paraboloidal mirror that very little, focal length is 2 inches.It is gold-plated or aluminize on the reflecting surface of paraboloidal mirror.
On the basis of the above embodiments, 11 specific structure of THz wave generation device can be as shown in Figure 9.In Fig. 9,
The THz wave generation device 11 includes：Grating 81, half-wave plate 82, imaging unit 83 and lithium columbate crystal 84；
Grating 81 is irradiated using pumping femtosecond laser, and is diffracted on half-wave plate 82 by grating 81, by half-wave plate 82
Behind the polarization direction for changing pumping femtosecond laser, then by being incident on lithium columbate crystal 84 after imaging unit 83.Imaging unit
83 be convex lens.
Specifically, before realizing inclined wave using grating 81 in the utility model, Terahertz is generated based on inclination of wave front technology
Pulse, and the terahertz pulse after optical grating diffraction is imaged onto by imaging len in lithium columbate crystal, by lithium columbate crystal
Carry out optical rectification, obtain high-energy, high speed THz wave.Half-wave plate 82 in the present embodiment swashs for changing pumping femtosecond
The polarization direction of light is allowed to match with lithium columbate crystal, the THz wave of final available high-energy.
On the basis of the above embodiments, further include femtosecond laser in THz wave generation device provided by the utility model
Device, for generating pumping femtosecond laser.
Specifically, femto-second laser may include all solid state femto-second laser or optical fiber femtosecond laser.Due in Terahertz
Femto-second laser is provided in wave generation device, the THz wave of the generation high-energy, high speed that can continue.To make Terahertz
The energy for the THz wave that wave generation device 11 generates reaches micro- burnt magnitude, then needs the energy of the pulse of femto-second laser generation
Amount reaches millijoule magnitude.
As shown in Figure 10, the THz wave that femto-second laser generates is through the first speculum 91, the second speculum 92 and third
Speculum 93 is incident on grating, and is finally got on lithium columbate crystal through half-wave plate and convex lens, and terahertz pulse wave is excited.
Here the first speculum 91, the second speculum 92 and third speculum 93 play the role of shortening light path.
On the basis of the above embodiments, the repetition rate of all solid state femto-second laser or optical fiber femtosecond laser exists
Numerically it is not less than the velocity of rotation of the electric rotating machine.
Specifically, repetition rate refers to the quantity of output terahertz pulse in the unit interval, and unit is hertz (Hz).Example
Such as, the pulse number occurred in one second is 50000, then repetition rate is 50KHz.Repetition rate is numerically not less than institute
The velocity of rotation of electric rotating machine is stated, i.e., the quantity of the terahertz pulse exported in the unit interval is greater than or exists equal to electric rotating machine
The number of turns rotated in unit interval ensures that each Terahertz narrow band filter slice on electric rotating machine plays selection and presets wave band
THz wave effect.
In conclusion terahertz imaging instrument provided by the utility model has the following advantages that：1) quickly：Utilize Terahertz phase
Machine carries out video imaging to the THz wave after irradiation object under test, and the speed of imaging depends on the repetition frequency of femto-second laser
Rate, the shortcomings that overcoming traditional imager measuring targets machinery point by point scanning, is, it can be achieved that fast imaging；2) image-forming principle letter
It is single：The imager only needs THz wave generation device, Terahertz narrow band filter slice and terahertz camera, you can realizes different peaks
The fast imaging being worth at wavelength.3) adaptability is good：Imager provided by the utility model not only using based on lithium columbate crystal,
It tilts the high-energy THz wave that wave front technology generates to be imaged, other devices can also be utilized to generate high-energy THz wave
And it is imaged.
Finally, the method for the utility model is only preferable embodiment, is not intended to limit the protection of the utility model
Range.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should be included in
Within the scope of protection of the utility model.
Claims (10)
1. a kind of terahertz imaging instrument, which is characterized in that including：First convergence apparatus, Terahertz narrow band filter slice, Terahertz phase
Machine and at least one THz wave generation device；
At least one THz wave generation device is used to generate the THz wave of preset energy grade, the Terahertz narrowband filter
Wave plate, first convergence apparatus and the terahertz camera are arranged in the transmission path of the THz wave, it is described too
Hertz wave converges to the terahertz camera through first convergence apparatus；
The Terahertz narrow band filter slice be arranged between the THz wave generation device and first convergence apparatus or
It is arranged between first convergence apparatus and the terahertz camera, the Terahertz narrow band filter slice is for obtaining default wave
The THz wave of section.
2. imager according to claim 1, which is characterized in that further include the first collimator apparatus；
First collimator apparatus is arranged in the transmission path of the THz wave, and is arranged and generates dress in the THz wave
Set between first convergence apparatus, first collimator apparatus collimates the THz wave, it is collimated too
Hertz wave is converged to using first convergence apparatus on the terahertz camera.
3. imager according to claim 1, which is characterized in that the imager includes multiple Terahertz narrow-band filterings
Piece, the multiple Terahertz narrow band filter slice are arranged in fixed plate；
Through-hole identical with the Terahertz narrow band filter slice quantity is provided in the fixed plate, each through-hole is for fixing one
Terahertz narrow band filter slice；
The fixed plate is vertically set in the transmission path of the THz wave.
4. imager according to claim 3, which is characterized in that further include：Electric rotating machine, the fixed plate and the rotation
Rotating motor connects.
5. imager according to claim 3, which is characterized in that the fixed plate is round fixed plate, described round solid
Through-hole identical with the Terahertz narrow band filter slice quantity is along the circumferential direction provided on fixed board；
Each through-hole is along the radial direction setting of the round fixed plate, and every two adjacent through-holes are justified with the round fixed plate
Angle between heart line is equal.
6. imager according to claim 2, which is characterized in that further include：Second collimator apparatus and the second convergence apparatus；
The THz wave is converged to through first convergence apparatus in a focus of second collimator apparatus, and described in warp
It is incident on second convergence apparatus after second collimator apparatus collimation, the Terahertz is converged to through second convergence apparatus
On camera.
7. imager according to claim 6, which is characterized in that first collimator apparatus, the first convergence apparatus, second
Collimator apparatus and the second convergence apparatus are lens；
Or first collimator apparatus, the first convergence apparatus, the second collimator apparatus and the second convergence apparatus are off axis paraboloid mirror
Mirror.
8. imager according to claim 4, which is characterized in that the THz wave generation device includes：Grating, half-wave
Piece, imaging unit and lithium columbate crystal；
The grating is irradiated using pumping femtosecond laser, and by the optical grating diffraction to the half-wave plate, by described half
After wave plate changes the polarization direction of the pumping femtosecond laser, then by being incident to the lithium columbate crystal after the imaging unit
On.
9. imager according to claim 8, which is characterized in that the pumping femtosecond laser is by all solid state femto-second laser
Or optical fiber femtosecond laser generates.
10. imager according to claim 9, which is characterized in that all solid state femto-second laser or optical fiber femtosecond swash
The repetition rate of light device is numerically not less than the velocity of rotation of the electric rotating machine.
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| CN201721670886.6U CN207798670U (en) | 2017-12-05 | 2017-12-05 | Terahertz imaging instrument |
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| CN201721670886.6U CN207798670U (en) | 2017-12-05 | 2017-12-05 | Terahertz imaging instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146932A (en) * | 2019-05-23 | 2019-08-20 | 深圳市华讯方舟太赫兹科技有限公司 | Terahertz imaging detection device |
| CN110275219A (en) * | 2019-05-23 | 2019-09-24 | 深圳市华讯方舟太赫兹科技有限公司 | Terahertz imaging detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146932A (en) * | 2019-05-23 | 2019-08-20 | 深圳市华讯方舟太赫兹科技有限公司 | Terahertz imaging detection device |
| CN110275219A (en) * | 2019-05-23 | 2019-09-24 | 深圳市华讯方舟太赫兹科技有限公司 | Terahertz imaging detection device |
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