CN105241816A - Terahertz imaging device and method - Google Patents
Terahertz imaging device and method Download PDFInfo
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- CN105241816A CN105241816A CN201510677053.1A CN201510677053A CN105241816A CN 105241816 A CN105241816 A CN 105241816A CN 201510677053 A CN201510677053 A CN 201510677053A CN 105241816 A CN105241816 A CN 105241816A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 29
- 241001436679 Adama Species 0.000 claims description 26
- 230000003287 optical effect Effects 0.000 claims description 23
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 230000000873 masking effect Effects 0.000 abstract 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The invention discloses a terahertz imaging device and method. The terahertz imaging device comprises a collimation module, a masking module and a reflected wave acquisition module. The collimation module is used for collimating incident terahertz signals and then enabling the terahertz signals to irradiate the masking module and an object to be imaged. The masking module is used for covering the part in front of the object to be imaged to control the irradiation region, irradiated by the terahertz signals, of the object. The reflected signal acquisition module is used for acquiring the reflected terahertz signals obtained after object transmission and converting the reflected terahertz signals into electric signals to be sent to a signal processing module. The signal processing module is used for controlling the masking module to move and conducting object imaging according to the corresponding electric signals.
Description
Technical field
The present invention relates to Terahertz (TeraHertz, THz) technical field, particularly relate to a kind of terahertz imaging device and method.
Background technology
Along with the development of Terahertz Technology, the technology utilizing terahertz time-domain spectroscopy to carry out imaging more and more receives publicity, traditional terahertz time-domain spectroscopy imaging technique, is to place sample at Terahertz light spot focus place, by two-dimension translational platform mobile example, gather the tera-hertz spectra of each pixel.Terahertz image is reverted to finally by corresponding algorithm.This formation method can obtain the spectral information of sample simultaneously and image information is a kind of light spectrum image-forming mode.Shortcoming is that image taking speed is slow owing to will scan one by one each pixel.Generally gather a tera-hertz spectra and need 1024 sampled points, obtaining a complete spectrum needs to spend 200s-300s.The Terahertz image of a 10*10 pixel needs the time of 8 hours.
A kind of Fourier transform spectrometer, scanned imagery device (as described in CN202869964U) is also had to utilize Fourier transform spectrometer, to carry out tera-hertz spectra imaging, not carry out imaging by mobile example, but by the spectrum picture of mobile paraboloidal mirror collected specimens.But the image taking speed of this imaging mode is equally also slow.Fourier trasform spectroscopy collection spectrum needs the time probably at about 100s.The tera-hertz spectra image of a same collection 10*10 also needs several hours.
Under many scenes, image taking speed so slowly, can not meet the demand of user.
Summary of the invention
For solving the technical matters of existing existence, the embodiment of the present invention is expected to provide a kind of terahertz imaging device and method, can accelerate speed and the performance of terahertz imaging.
The technical scheme of the embodiment of the present invention is achieved in that
The embodiment of the present invention provides a kind of terahertz imaging device, and this device comprises: collimating module, mask module and reflection wave acquisition module; Wherein,
Collimating module, collimates rear irradiation to mask module and article to be imaged for being carried out by the terahertz signal of incidence;
Mask module, before covering article to be imaged, controls the irradiation area that terahertz signal irradiates described article;
Reflected signal acquisition module, for gathering the reflected terahertz hereby signal after the reflection of described article, and by described reflected terahertz hereby signal be converted to electric signal and be sent to signal processing module;
Signal processing module, for controlling the movement of mask module, and carries out article imaging according to the electric signal of correspondence.
In such scheme, described mask module comprises:
Adama mask unit, is positioned on the travel path of article reflected terahertz to be imaged hereby signal, and for according to Hadamard transform rule, the terahertz signal be treated as article reflection is modulated;
Mask control module, moves according to preset path for controlling Adama mask unit.
In such scheme, described device also comprises:
Frequency division module, after being positioned at article to be imaged, for the reflected terahertz of each frequency that described article are reflected hereby signal focus on the different position of optical axis respectively.
In such scheme, described reflected signal acquisition module comprises:
N number of reflected signal fixes collecting unit, is respectively used to the reflected terahertz hereby signal gathering N number of different frequency, is positioned at the different focal positions of described optical axis.
In such scheme, described reflected signal acquisition module comprises:
Reflected signal mobile collection unit, for moving on optical axis, gathers the reflected terahertz hereby signal of different frequency.
The embodiment of the present invention also provides a kind of terahertz imaging method, and the method comprises:
The terahertz signal of incidence is carried out collimate rear irradiation to mask module and article to be imaged;
Before mask module is covered article to be imaged, to control the irradiation area that terahertz signal irradiates described article;
Gather the reflected terahertz hereby signal after the reflection of described article, and by described reflected terahertz hereby signal be converted to electric signal;
Control the movement of mask module, and carry out article imaging according to the electric signal of correspondence.
In such scheme, described mask module is covered article to be imaged before, the irradiation area irradiating described article to control terahertz signal comprises:
Adama mask is positioned on the travel path of article reflected terahertz to be imaged hereby signal, and moves this Adama mask according to the path of presetting, realize Hadamard transform.
In such scheme, gathering the reflected terahertz after the reflection of described article hereby before signal, described method also comprises:
The reflected terahertz of each frequency reflected by described article hereby signal focuses on the different position of optical axis respectively.
In such scheme, gather the reflected terahertz after the reflection of described article hereby signal comprise:
Use N number of reflected signal being fixed on N number of position of the different focal position of optical axis to fix collecting unit, gather the reflected terahertz hereby signal of N number of different frequency respectively; Or
Use a reflected signal mobile collection unit, optical axis moves, gather the reflected terahertz hereby signal of different frequency.
The terahertz imaging device that the embodiment of the present invention provides and method, utilize and hereby signal propagation path places Adama mask in the reflected terahertz of article to be imaged, the signal to noise ratio (S/N ratio) of sampled signal is improve while achieving the batch sampling to article pixel, simultaneously, article to be imaged are not moved by mobile Adama mask, realize the comprehensive sampling to described each pixel of article, thus the aberration avoided mobile article and bring; In addition, utilize Fresnel Lenses or Fresnel zone plate by the reflected terahertz of article to be imaged hereby ripple focus on positions different on optical axis, thus realize the image of the THz wave gathering each different frequency, improve the speed of terahertz imaging further.
Accompanying drawing explanation
The composition schematic diagram of the terahertz imaging device that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the structural representation of the Adama mask used in the embodiment of the present invention;
The space compression schemes of Fig. 3 corresponding to the Adama mask shown in Fig. 2;
Fig. 4 is the composition structural drawing of a specific embodiment of terahertz imaging device provided by the invention.
Embodiment
In order to be illustrated more clearly in the embodiment of the present invention and technical scheme, be described in detail technical scheme of the present invention below in conjunction with drawings and Examples, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiment.Based on embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not paying creative work, all belongs to the scope of protection of the invention.
The composition schematic diagram of the terahertz imaging device that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1, this device comprises: collimating module 101, mask module 102, reflection wave acquisition module 103 and signal processing module 104; Wherein,
Collimating module 101, collimates rear irradiation to mask module and article to be imaged for being carried out by the terahertz signal of incidence;
Mask module 102, before covering article to be imaged, controls the irradiation area that terahertz signal irradiates described article;
Reflected signal acquisition module 103, for gathering the reflected terahertz hereby signal after the reflection of described article, and is converted to electric signal and is sent to signal processing module;
Signal processing module 104, for controlling the movement of mask module, and carries out article imaging according to the electric signal of correspondence.
Concrete, collimating module 101 can be that convex lens or off axis paraboloidal mirror etc. have device THz wave being carried out straight standard.
Preferably, mask module 102 comprises:
Adama mask unit, is positioned on the travel path of article reflected terahertz to be imaged hereby signal, and for according to Hadamard transform rule, the terahertz signal be treated as article reflection is modulated;
Mask control module, moves according to preset path for controlling Adama mask unit.
Concrete, Adama mask unit can be one piece of mask as shown in Figure 2, and this mask is made up the material of THz wave high reflectance of metal etc., and in Fig. 2, the part of white represents solid, and THz wave is reflected; The part of grey represents hollow out, and THz wave can through not reflected.The travel path this mask being positioned over article reflected terahertz to be imaged hereby signal moves, be equal to and carry out variable space encoding on light path cross section, each coding unit corresponds to a pixel on image, each unit all can be placed in 0 or 1 state, i.e. not reflective condition or reflective condition.Such as, corresponding with mask shown in Fig. 2 space encoding as shown in Figure 3.This Adama mask unit moves according to the path of presetting by mask control module, can complete the Hadamard transform to the terahertz signal irradiating article to be imaged, and then realizes the Hadamard transform to the terahertz signal reflecting article to be imaged.
Fig. 2 merely illustrates the Adama mask of a kind of 3*5 (namely 15) imaging pixel, and the specification of Adama mask in practical application and kind a variety of in addition, specifically how to select the specification of Adama mask and kind to be mainly considered to the pixel count of picture.And once selected specific Adama mask, then namely the mobile route that this mask is corresponding has been determined, and this is determined by Hadamard transform algorithm.Directly can make Adama mask with reference to the rule of existing Adama spectrometer.Concrete, Adama mask shown in Fig. 2, then it is positioned at the upper left corner in region to be imaged when initial, then first to line down, at the row that move right under the control of mask control module, circulate successively, until this Adama mask moves to the lower right corner in region to be imaged.Before row/column moves each time, all first carry out the collection of reflected terahertz hereby signal.
Further, in order to accelerate the speed of signals collecting, before reflected signal acquisition module 103, described terahertz imaging device also comprises:
Frequency division module, after being positioned at article to be imaged, for the reflected terahertz of each frequency that described article are reflected hereby signal focus on the different position of optical axis respectively.
Concrete, frequency division module can be terahertz signal frequency division on optical axis that Fresnel Lenses or Fresnel zone plate etc. can will be modulated through mask plate, therefore, in described reflected signal acquisition module 103, can comprise:
N number of reflected signal fixes collecting unit, is respectively used to the reflected terahertz hereby signal gathering N number of different frequency, is positioned at the different focal positions of described optical axis.
N is larger, then the efficiency of parallel acquisition reflected signal is higher, but also will cause the increase of the manufacturing cost of imaging device.
Therefore, reflected signal acquisition module 103 can also comprise:
Reflected signal mobile collection unit, for moving on optical axis, gathers the reflected terahertz hereby signal of different frequency.
Certainly, in order to balance reflected signal collecting efficiency and imaging device manufacturing cost, also can arrange multiple reflected signal mobile collection unit, each reflected signal mobile collection unit is responsible for the reflected terahertz hereby signal of the different frequency gathered in optical axis the preceding paragraph distance simultaneously.Like this, the reflected terahertz hereby signal of parallel acquisition different frequency can be realized, the quantity of collecting unit can be reduced again.
In practical application, above-mentioned reflected signal fixes collecting unit and reflected signal mobile collection unit all can be realized by terahertz detector, and terahertz signal can be converted to electric signal and be sent to signal processing module 104 by terahertz detector.
Concrete, signal processing module 104 for controlling the movement of mask module, and carries out article imaging according to the electric signal of correspondence.Its image-forming principle used is as follows:
In the signal detection system of encoding optical imaging, suppose the image information that will obtain a width two dimensional image, its object is exactly obtain the space distribution of image intensity signal and the size of semaphore.We can consider the coding form of piece image in a two-dimensional space.If (x, y) is the volume coordinate of a width two dimensional image, the function that φ (x, y) is x, y, its size corresponds to the intensity of this coordinate place pixel, and the object of imaging measurement determines the distribution of φ (x, y) exactly.In actual measurement, be φ (x, y) discretize is processed determine that it distributes.For this reason, sliding-model control is carried out to target image,
For 3*5 image, 3 and 5 line number and the columns being respectively division, then the information of a width two dimensional image can be expressed as:
At this time have 15 unknown numbers to need to carry out 15 times to measure:
Suppose i-th measure in, coding be configured as W
i1, W
i2, W
i3w
i (15), accordingly result is Y
i
Wherein
coordinate x
jy
sthe intensity of place's pixel, e
iit is noise when measuring specifically.
Matrix is adopted to be simplified shown as;
Ignore noise then can obtain
its value can be programmed on computers and be solved, and can be realized the reproduction of image by this unbiased estimator.
In actual applications, signal processing module 104 can be realized by the central processing unit of described terahertz imaging device (CPU), microprocessor (MPU), digital signal processor (DSP) or field programmable gate array (FPGA).
In order to be embodied as picture, in described terahertz imaging device, also comprise collector, storage medium and display screen; Wherein, collector the data of terahertz wave detector are carried out amplify, analog to digital conversion; Storage medium is used for poke template sequence, reconfiguration program, raw data, view data, and display screen is for showing reconstructed image.
Fig. 4 is the composition structural drawing of a specific embodiment of terahertz imaging device provided by the invention, and wherein, straight arrows indicates THz wave travel path in the apparatus.If shown in 4, through Fresnel Lenses, the reflected terahertz hereby wavelength-division of different frequency does not converge at difference place on optical axis, and terahertz detector can gather the THz wave at these some places respectively.
The embodiment of the present invention also provides a kind of terahertz imaging method, and the method comprises:
The terahertz signal of incidence is carried out collimate rear irradiation to mask module and article to be imaged;
Before mask module is covered article to be imaged, to control the irradiation area that terahertz signal irradiates described article;
Gather the reflected terahertz hereby signal after the reflection of described article, and by described reflected terahertz hereby signal be converted to electric signal;
Control the movement of mask module, and carry out article imaging according to the electric signal of correspondence.
In such scheme, described mask module is covered article to be imaged before, the irradiation area irradiating described article to control terahertz signal comprises:
Adama mask is positioned on the travel path of article reflected terahertz to be imaged hereby signal, and moves this Adama mask according to the path of presetting, realize Hadamard transform.
In such scheme, gathering the reflected terahertz after the reflection of described article hereby before signal, described method also comprises:
By the reflected terahertz reflecting each frequency of described article hereby signal focus on the different position of optical axis respectively.
In such scheme, gather the reflected terahertz after the reflection of described article hereby signal comprise:
Use N number of reflected signal being fixed on N number of position of the different focal position of optical axis to fix collecting unit, gather the reflected terahertz hereby signal of N number of different frequency respectively; Or
Use a reflected signal mobile collection unit, optical axis moves, gather the reflected terahertz hereby signal of different frequency.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of hardware embodiment, software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the process flow diagram of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (9)
1. a terahertz imaging device, is characterized in that, described device comprises: collimating module, mask module and reflection wave acquisition module; Wherein,
Collimating module, collimates rear irradiation to mask module and article to be imaged for being carried out by the terahertz signal of incidence;
Mask module, before covering article to be imaged, controls the irradiation area that terahertz signal irradiates described article;
Reflected signal acquisition module, for gathering the reflected terahertz hereby signal after the reflection of described article, and by described reflected terahertz hereby signal be converted to electric signal and be sent to signal processing module;
Signal processing module, for controlling the movement of mask module, and carries out article imaging according to the electric signal of correspondence.
2. terahertz imaging device according to claim 1, is characterized in that, described mask module comprises:
Adama mask unit, is positioned on the travel path of article reflected terahertz to be imaged hereby signal, and for according to Hadamard transform rule, the terahertz signal be treated as article reflection is modulated;
Mask control module, moves according to preset path for controlling Adama mask unit.
3. terahertz imaging device according to claim 1 and 2, is characterized in that, described device also comprises:
Frequency division module, after being positioned at article to be imaged, for the reflected terahertz of each frequency that described article are reflected hereby signal focus on the different position of optical axis respectively.
4. terahertz imaging device according to claim 3, is characterized in that, described reflected signal acquisition module comprises:
N number of reflected signal fixes collecting unit, is respectively used to the reflected terahertz hereby signal gathering N number of different frequency, is positioned at the different focal positions of described optical axis.
5. terahertz imaging device according to claim 3, is characterized in that, described reflected signal acquisition module comprises:
Reflected signal mobile collection unit, for moving on optical axis, gathers the reflected terahertz hereby signal of different frequency.
6. a terahertz imaging method, is characterized in that, described method comprises:
The terahertz signal of incidence is carried out collimate rear irradiation to mask module and article to be imaged;
Before mask module is covered article to be imaged, to control the irradiation area that terahertz signal irradiates described article;
Gather the reflected terahertz hereby signal after the reflection of described article, and by described reflected terahertz hereby signal be converted to electric signal;
Control the movement of mask module, and carry out article imaging according to the electric signal of correspondence.
7. terahertz imaging method according to claim 6, is characterized in that, described mask module is covered article to be imaged before, the irradiation area irradiating described article to control terahertz signal comprises:
Adama mask is positioned on the travel path of article reflected terahertz to be imaged hereby signal, and moves this Adama mask according to the path of presetting, realize Hadamard transform.
8. the terahertz imaging method according to claim 6 or 7, is characterized in that, gathering the reflected terahertz after the reflection of described article hereby before signal, described method also comprises:
The reflected terahertz of each frequency reflected by described article hereby signal focuses on the different position of optical axis respectively.
9. terahertz imaging method according to claim 8, is characterized in that, gather the reflected terahertz after the reflection of described article hereby signal comprise:
Use N number of reflected signal being fixed on N number of position of the different focal position of optical axis to fix collecting unit, gather the reflected terahertz hereby signal of N number of different frequency respectively; Or
Use a reflected signal mobile collection unit, optical axis moves, gather the reflected terahertz hereby signal of different frequency.
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