CN204925626U - Quantum cascades laser instrument terahertz holographic imaging system of source digit now - Google Patents
Quantum cascades laser instrument terahertz holographic imaging system of source digit now Download PDFInfo
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- CN204925626U CN204925626U CN201520706211.7U CN201520706211U CN204925626U CN 204925626 U CN204925626 U CN 204925626U CN 201520706211 U CN201520706211 U CN 201520706211U CN 204925626 U CN204925626 U CN 204925626U
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Abstract
The utility model discloses a quantum cascades laser instrument terahertz holographic imaging system of source digit now, cascade laser instrument terahertz source now including the quantum, light beam shaping module, holographic light path module, the image is surveyed and collection module, by the beam splitting piece of the holographic light path module of second off -axis parabolic mirror normal sheaf after the quantum cascades the laser instrument terahertz light beam in source reflects on light beam shaping module's lens parallel focuses first off -axis parabolic mirror now, the beam splitting piece divide into two way light beams with the plastic light beam, first via light beam waits through what first speculum saw through the sample bench that it forms and carry the thing light of object information to form images the object, shine to closing the light microscopic, second way light beam shines to closing the light microscopic as the reference light through the second mirror, the thing light sum reference light emergence interference of closing on the light microscopic is gathered with collection module by the image detection. The utility model discloses a holographic imaging system carries out meticulous formation of image to nonmetal NOT AND polar material's structure and function to entire system modularization, miniaturization.
Description
Technical field
The utility model relates to holographic imaging systems, particularly relates to a kind of quantum cascade laser THz source digital holographic imaging systems.
Background technology
Terahertz (THz) ripple refers to that frequency is from 0.1THz to 10THz, the electromagnetic wave between millimeter wave and infrared light, has the features such as security, broadband property, " dactylogram characteristic " and penetrability.THz ripple has important scientific value and wide application prospect, has unique advantage in multiple fields such as basic science, investigation of materials, biomedicine, national public safeties.
THz wave application can be divided into THz wave imaging, THz wave analysis of spectrum, THz wave communicate three directions.THz wave imaging can not only carry out structure imaging to object, and can also carry out functional imaging, namely not only can show the profile of object, and the kind of energy recognition object.Particularly for visible ray can not through and the inadequate occasion of x-ray imaging contrast, THz wave imaging is almost unique selection; It and microwave imaging, x-ray imaging, ultrasonic imaging etc. form strong complementary advantage, are particularly useful for imaging research that is nonmetal and non-polar material.
THz wave imaging can be divided into THz wave holographic imaging, THz wave scanning imagery and THz wave tomography three major types.Hologram due to THz wave holographic imaging have recorded the full detail of object light field, therefore by obtaining the light wave fields distribution on arbitrary plane to the numerical evaluation of beam propagation behavior, thus can reach the effect eliminating THz wave diffraction effect; In addition, THz wave holographic imaging is compared with conventional focal plane imaging, and its focal plane can unrestricted choice, avoids light path alignment error influence on RT, and can adopt large-numerical aperture imaging, is easy to the spatial resolution promoting image.
THz wave digital hologram imaging detector instead of original film, and processes with computing machine the image information that detector obtains, thus the fine structure of reproducing object.At present, THz source digital holographic imaging systems is non-commercialization also, in order to improve the spatial resolution of THz source digital holographic imaging systems, the imaging system of present stage all selects the FIRL series of products (highest frequency can arrive 7.5THz) of high frequency (being greater than 1 Terahertz) THz source-EI company of Britain as light source, and this THz source has the advantages such as output power large (the highest can close to 200mW), beam quality are good, multifrequency point selection; But the digital holographic imaging systems that the shortcomings such as its complex structure, bulky, output power is unstable determine based on this THz source can only be used for laboratory environment, cannot realize modularization, miniaturization and commercialization.
Summary of the invention
Applicant conducts in-depth research the structure of THz source digital holographic imaging systems and imaging process in R&D process, on the basis ensureing imaging effect, using quantum cascade laser THz source as THz wave light source, simplify the structural design of whole imaging system, achieve the miniaturization of holographic imaging systems, modularization, be convenient to product and apply fast.
Specifically, the utility model is achieved by the following technical solution:
A kind of quantum cascade laser THz source digital holographic imaging systems, comprise quantum cascade laser THz source, light beam shaping module, holographic light path module, image detection and acquisition module, the light beam of quantum cascade laser THz source to focus on the first off-axis paraboloidal mirror after reflection by the beam splitting chip of the second off-axis paraboloidal mirror normal sheaf holographic light path module through the lens of light beam shaping module are parallel, shaping light beam is divided into two-way light beam by beam splitting chip, first via light beam forms the object light of carrying object information through the object to be imaged on sample stage through the first catoptron, expose to conjunction light microscopic, second road light beam exposes to through the second catoptron and closes light microscopic as reference light, object light on conjunction light microscopic and reference light interfere phenomenon and are gathered by image detection and acquisition module.
In said structure, adopt quantum cascade laser as THz wave light source, its macro-size, in millimeter magnitude, also only has the general size of matchbox, effectively reduces small product size after completing encapsulation; It is placed on sterlin refrigerator low temperature platform in use, vacuumizes the THz wave of cooling energising and exportable 1-10mW.In order to the drawback overcoming quantum cascade laser diffraction effect He disperse, employ the beam quality that specific light beam shaping module significantly improves light source, ensure that follow-up holographic imaging effect.
Image detection wherein used and acquisition module normally adopt the devices such as CCD or CMOS to receive the interference fringe field of reference light and object light, are imported into computer record digital hologram by image pick-up card.
In the utility model, in order to realize the Precise imaging of object structures, the first catoptron, with in the light path of conjunction light microscopic, is provided with pre-amplification object lens between object to be imaged and conjunction light microscopic.
Due to the existence of above-mentioned magnifier, make to reach the object light of closing light microscopic with more accurately, more clearly object information.
In the utility model, the second catoptron with the light path of conjunction light microscopic are provided with dimmer.
By using dimmer, making thing join light and producing speckle pattern interferometry under condition more accurately.
In order to filtering clutter, reduce the data processing load in later stage, conjunction light microscopic and the light path between image detection and acquisition module are provided with filter plate.
Consider clutter type common in digital hologram imaging, described filter plate is preferably infrared filter.
It will be understood by those skilled in the art that the observation in order to realize holographic imaging and utilization, described image detection and acquisition module are connected with data processing and playback system.
Usually above-mentioned data processing and playback system are computers, and the arithmetic element of computer utilizes fresnel diffraction principle simulated optical diffraction process in CPU, realizes the digital reproduction of hologram; The hologram finally utilizing digital picture ultimate principle to reproduce is further processed, and removes digital interference, obtains hologram image clearly, and be presented on connected display.
Compared with traditional holographic imaging systems, the THz source digital holographic imaging systems volume that the technical solution of the utility model is developed based on quantum cascade laser is not higher than 1.2m × 0.8m × 1.2m (L × W × H), weight can be controlled within 200kg, convenient mobile and product architecture modularization, miniaturization, can realize, to the nonmetal structure and fuction imaging with non-polar material, being convenient to commercially mass marketing and application.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model quantum cascade laser THz source digital holographic imaging systems.
In the accompanying drawings, each numerology is as follows: 1. quantum cascade laser THz source, 2. lens, 3. off-axis paraboloidal mirror, 4. off-axis paraboloidal mirror, 5. beam splitting chip, 6. catoptron, 7. dimmer, 8. catoptron, 9. sample stage, 10. lens, 11. close light microscopic, 12. infrared filters, 13. image detection and acquisition system, 14. data processings and playback system.
Embodiment
Below in conjunction with accompanying drawing, product structure of the present utility model is described in detail.The following technical scheme provided is only schematic, does not form special restriction to the utility model.
As shown in Figure 1, quantum cascade laser THz source digital holographic imaging systems of the present utility model, comprises following structure: quantum cascade laser THz source 1, light beam shaping module, holographic light path module, image detection and acquisition module 13.
Wherein, the first off-axis paraboloidal mirror 3, second off-axis paraboloidal mirror 4 that light beam shaping module comprises lens 2, is oppositely arranged, the divergent beams that quantum cascade laser THz source penetrates by lens 2 form directional light directive first off-axis paraboloidal mirror 3 (adjustment distance makes quantum cascade laser THz source 1 be positioned at the focal position of lens 2), through with the second off-axis paraboloidal mirror 4 of the first off-axis paraboloidal mirror 3 symmetric design after penetrate, realize the complete shaping of light beam, prevent mixed and disorderly light beam from affecting imaging effect; Holographic light path module comprises beam splitting chip 5, first catoptron 8, second catoptron 6, the light beam of shaping is through beam splitting chip 5 formation ginseng two-way light beam, one tunnel first catoptron 8 forms the object light of carrying object information through the object to be imaged on sample stage 9, exposes to and closes on light microscopic 11; Another road second catoptron 6 exposes to and closes light microscopic 11, thus interferes phenomenon formation hologram at conjunction light microscopic; Image detection and acquisition module 13 are CCD and image pick-up card, and the interference fringe field receiving reference light and object light by CCD, is imported into computer record digital hologram by image pick-up card; Final digital hologram enters data processing and playback system 14 (i.e. computer) carries out process and imaging shows.
In order to improve imaging effect, object on sample stage 9 and close between light microscopic 11 and be provided with pre-amplification object lens 10, between the second catoptron 6 and conjunction light microscopic 11, be provided with dimmer 7, closing light microscopic 11 and be provided with infrared filter 12 between image detection and acquisition module 13.
The principle of work of said structure is as follows: quantum cascade laser THz source exports THz wave, the light beam shaping module formed through lens and first, second off-axis paraboloidal mirror carries out beam shaping, again through beam splitting chip formation ginseng two-way light beam, one tunnel first catoptron forms the object light of carrying object information through the object on sample stage, collects and exposes to close on light microscopic through pre-amplification object lens; Another road second catoptron is also exposed on conjunction light microscopic by dimmer.The thing ginseng light closed on light microscopic interferes phenomenon and forms hologram, and after infrared filter filtering, carry out image detection and collection, data transfer to the fine structure of data processing and playback system reproducing object.
Claims (6)
1. a quantum cascade laser THz source digital holographic imaging systems, it is characterized in that comprising quantum cascade laser THz source, light beam shaping module, holographic light path module, image detection and acquisition module, the light beam of quantum cascade laser THz source to focus on the first off-axis paraboloidal mirror after reflection by the beam splitting chip of the second off-axis paraboloidal mirror normal sheaf holographic light path module through the lens of light beam shaping module are parallel, shaping light beam is divided into two-way light beam by beam splitting chip, first via light beam forms the object light of carrying object information through the object to be imaged on sample stage through the first catoptron, expose to conjunction light microscopic, second road light beam exposes to through the second catoptron and closes light microscopic as reference light, object light on conjunction light microscopic and reference light interfere phenomenon and are gathered by image detection and acquisition module.
2. holographic imaging systems according to claim 1, is characterized in that, in the light path of the first catoptron with conjunction light microscopic, between object to be imaged and conjunction light microscopic, being provided with pre-amplification object lens.
3. holographic imaging systems according to claim 1, is characterized in that being provided with dimmer on the second catoptron with the light path of conjunction light microscopic.
4. holographic imaging systems according to claim 1, is characterized in that being provided with filter plate on conjunction light microscopic and the light path between image detection and acquisition module.
5. holographic imaging systems according to claim 4, is characterized in that filter plate is infrared filter.
6. holographic imaging systems according to claim 1, is characterized in that image detection and acquisition module are connected with data processing and playback system.
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| CN201520706211.7U CN204925626U (en) | 2015-09-14 | 2015-09-14 | Quantum cascades laser instrument terahertz holographic imaging system of source digit now |
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| CN201520706211.7U CN204925626U (en) | 2015-09-14 | 2015-09-14 | Quantum cascades laser instrument terahertz holographic imaging system of source digit now |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068397A (en) * | 2015-09-14 | 2015-11-18 | 中国工程物理研究院激光聚变研究中心 | Quantum cascade laser terahertz source digital holographic imaging system |
| CN106841013A (en) * | 2017-03-16 | 2017-06-13 | 中国科学院重庆绿色智能技术研究院 | A kind of method that microscopic organism is distinguished based on Quantum Correlation imaging technique |
| CN113782666A (en) * | 2021-11-12 | 2021-12-10 | 同方威视技术股份有限公司 | Terahertz detection device with adjustable detection frequency band, manufacturing method and imaging equipment |
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2015
- 2015-09-14 CN CN201520706211.7U patent/CN204925626U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068397A (en) * | 2015-09-14 | 2015-11-18 | 中国工程物理研究院激光聚变研究中心 | Quantum cascade laser terahertz source digital holographic imaging system |
| CN106841013A (en) * | 2017-03-16 | 2017-06-13 | 中国科学院重庆绿色智能技术研究院 | A kind of method that microscopic organism is distinguished based on Quantum Correlation imaging technique |
| CN106841013B (en) * | 2017-03-16 | 2019-02-26 | 中国科学院重庆绿色智能技术研究院 | A method of microscopic organism is distinguished based on Quantum Correlation imaging technique |
| CN113782666A (en) * | 2021-11-12 | 2021-12-10 | 同方威视技术股份有限公司 | Terahertz detection device with adjustable detection frequency band, manufacturing method and imaging equipment |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20160914 |