CN107942338B - Multi-wavelength associated imaging system based on digital micromirror device - Google Patents
Multi-wavelength associated imaging system based on digital micromirror device Download PDFInfo
- Publication number
- CN107942338B CN107942338B CN201710895078.8A CN201710895078A CN107942338B CN 107942338 B CN107942338 B CN 107942338B CN 201710895078 A CN201710895078 A CN 201710895078A CN 107942338 B CN107942338 B CN 107942338B
- Authority
- CN
- China
- Prior art keywords
- optical system
- laser
- ultra
- wideband
- mirror device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/46—Indirect determination of position data
- G01S17/48—Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
Abstract
The invention discloses a multi-wavelength associated imaging system based on a digital micromirror device, which comprises a laser, the digital micromirror device, a transmitting optical system, a receiving optical system, a dispersion prism, a linear array detector and a computer, wherein the laser is connected with the digital micromirror device through a transmission optical system; the laser outputs ultra-wideband laser pulses, and the ultra-wideband laser pulses are incident on the digital micromirror device; the digital micro-mirror device receives a modulation signal output by a computer and modulates and converts the ultra-wideband laser pulse into a pseudo-thermal light pulse; the pseudo-thermal light pulse is expanded and shaped by the transmitting optical system, and irradiates on a target object, a target echo signal is converged and down-sampled by the receiving optical system, is dispersed by the dispersion prism, and then irradiates on the linear array detector to be converted into an electric signal. The invention utilizes the digital micro-mirror device to modulate the ultra-wideband narrow pulse laser to generate pseudo-thermal light to realize the associated imaging, and can obtain the spectral image information and the distance information of the target object only by the linear array detector.
Description
Technical Field
The invention relates to the field of photoelectric imaging, in particular to a multi-wavelength correlation imaging system based on a digital micromirror device.
Background
The invention relates to an associated imaging system, which is a new system imaging system for irradiating a target by using a quantum entanglement light source, a thermal light source or a pseudo-thermal light source to obtain target space distribution information. The system uses a quantum entanglement light source, a thermal light source or a pseudo-thermal light source to generate a light beam with space-time correlation characteristics, the light beam is divided into two beams, one beam is left in an imaging system and is monitored by an area array detector for distribution characteristics, and the other beam is emitted to a target; the target reflected light signal passes through a convergent point detector of a receiving optical system; the electric signal output by the point detector and the light field distribution information obtained by monitoring of the area array detector are subjected to coincidence measurement, and a target image can be obtained. Compared with the traditional imaging system, the correlated imaging can obtain a high-resolution target by using a point detector; meanwhile, the spatial resolution of the target is not directly measured, so that the method has stronger disturbance resistance; in addition, the system has a concise optical path, low requirements on processing technology, good reliability and easy miniaturization, can be used for various platforms, and has great application prospects in the field of military and civil.
The current associated imaging systems have the following problems: the quantum entangled light source or the thermal light source has low generation efficiency and low brightness, and is difficult to adapt to the application environment of remote imaging; the obtained target information is single and is not beneficial to target identification; the image reconstruction algorithm based on coincidence measurement has low resolving speed and poor reconstruction quality, has unobvious advantages compared with the traditional imaging system in the conventional imaging scene, and limits the practical application of the associated imaging system.
Disclosure of Invention
In order to solve the problems, the invention provides a multi-wavelength correlation imaging system based on a digital micromirror device. The imaging system modulates the ultra-wide band narrow pulse laser through a digital micro-mirror device to generate ultra-wide band pseudo-thermal light pulses. The pseudo-thermal light pulse is used for irradiating the target to carry out active imaging, the distance, the intensity and the spectral information of the target can be obtained, the performance of a correlation imaging system is improved, and the target identification is facilitated.
A multi-wavelength correlated imaging system based on digital micromirror devices, comprising:
the system comprises a laser, a digital micromirror device, a transmitting optical system, a receiving optical system, a dispersion prism, a linear array detector and a computer; the ultra-wideband narrow pulse laser output by the laser is subjected to spatial intensity distribution modulation by a digital micro-mirror device to generate ultra-wideband pseudo-thermal light pulses; the ultra-wideband pseudo-thermal light pulse is subjected to beam expansion shaping by a transmitting optical system, is irradiated on a detected object, is subjected to convergence and down-sampling by a receiving optical system after being reflected, is subjected to light splitting by a dispersion prism, and is irradiated on a linear array detector for photoelectric conversion to obtain echo intensity information and spectral distribution information of a target to be observed; the linear array detector outputs the information to a computer for subsequent analysis and processing.
Furthermore, the laser is an ultra-wideband narrow pulse laser.
Further, the digital micromirror device is a high-speed high-resolution digital micromirror device.
Furthermore, the transmitting optical system and the receiving optical system are optical telescope systems formed by non-spherical lenses.
Furthermore, a small-size quartz substrate metal film mask plate is added into the receiving optical system.
Further, the dispersion prism is an amici prism.
Furthermore, the linear array detector is a one-dimensional orderly arranged photoelectric detector array or a one-dimensional position sensitive photoelectric detector.
According to the technical scheme, the invention has the beneficial effects that:
1. the ultra-wideband narrow-pulse laser is used as a transmitting light source, and the characteristics of wide spectral range and short pulse of the ultra-wideband narrow-pulse laser are utilized to irradiate a target for active imaging, so that the spectral information and the high-precision distance information of the target can be acquired at the same time;
2. the ultra-wideband narrow pulse laser is modulated by using a digital micro-mirror device, and the digital micro-mirror device has the characteristics of high modulation rate, high spatial resolution, wide reflection spectrum band, high laser damage threshold and presettability, so that ultra-wideband pseudo-thermal light pulses with high brightness and strong correlation characteristics can be output;
3. the optical telescope is used as a system transmitting and receiving optical system, and the telescope is designed by adopting the non-spherical lens, so that the structure is simple, the aberration of a far field can be eliminated, and the transmitting and receiving capacity of the system is improved;
4. adding a mask plate on an imaging surface of a receiving optical system, and performing down-sampling on a target echo signal to prevent spectrum aliasing of adjacent sampling points; meanwhile, the luminous flux, the spatial resolution and the spectral resolution of the system can be adjusted by changing the size of the hole on the mask plate;
5. the Amisy prism is used for carrying out dispersion on the target echo signal, the reduction of the signal-to-noise ratio caused by trapezoidal distortion and smiling face distortion when the common prism is subjected to dispersion is eliminated, the luminous flux of the system is increased, the deflection angles of dispersed light and incident light are reduced, all elements of the system can be placed on the same straight line, and the system structure becomes more compact;
6. the linear array detector is used for completing spectral imaging of the target, the measurement sensitivity and the measurement speed are high, a scanning mechanism is not needed, a two-dimensional spectral image can be obtained, and the imaging system is simplified.
Drawings
FIG. 1 is a schematic diagram of a multi-wavelength correlated imaging system based on a digital micromirror device;
FIG. 2 is a timing diagram illustrating the operation of the system according to the present invention;
FIG. 3 is a schematic diagram of a receiving optical system according to the present invention;
fig. 4 is a schematic diagram of the principle of the amici prism of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, the multi-wavelength correlated imaging system based on the digital micromirror device includes a laser, a digital micromirror device, a transmitting optical system, a receiving optical system, a dispersion prism, a linear array detector, and a computer; the laser outputs ultra-wideband (the ultra-wideband refers to the wavelength range of 380nm-2um) laser pulses, and the laser pulses are incident on the digital micro-mirror device; the digital micro-mirror device receives a modulation signal output by a computer and converts laser pulse modulation into pseudo-thermal light; pseudo-thermal light is expanded and shaped by a transmitting optical system and then irradiated on a target object, a target echo signal is converged and down-sampled by a receiving optical system, then is dispersed by a dispersion prism and then is irradiated on a linear array detector and converted into an electric signal. And calculating to obtain the spectral image information and the distance information of the target object according to the electric signal and the modulation signal of the computer. The laser 1 is an ultra-wideband narrow pulse laser (the ultra-wideband refers to a wavelength range of 380nm-2um, and the narrow pulse is less than or equal to 200 fs); the digital micro-mirror device 2 is a high-speed high-resolution digital micro-mirror device (when the digital micro-mirror device (2) is a Discovery series micro-mirror device produced by TI company, the testing effect is best); the transmitting optical system 3 and the receiving optical system 4 are a transmitting-receiving coaxial integrated optical telescope system; a small-size quartz substrate metal film mask plate (the size of the metal film quartz substrate mask plate is less than or equal to 2cm multiplied by 2cm) is added into the receiving optical system 4; the dispersion prism 5 is an Amisy prism; the linear array detector 6 is a one-dimensional orderly arranged photoelectric detector array or a one-dimensional position sensitive photoelectric detector (when the linear array detector is a linear array CCD produced by Dalsa corporation, the testing effect is the best).
As shown in fig. 2, a system operation timing diagram is given. Firstly, outputting an ultra-wideband laser pulse by a laser 1, and taking the ultra-wideband laser pulse as a system ranging timing starting signal; meanwhile, the digital micromirror device modulates the ultra-wideband laser pulse to generate pseudo-thermal light pulse according to a random signal matrix output by the computer; after the pulse interacts with a target, an echo signal is received by the linear array detector and is used as a system ranging timing ending signal; and simultaneously, performing correlation measurement on the signals output by the linear array detector and the random signal matrix, and resolving to obtain a target spectrum image.
As shown in fig. 3, a schematic diagram of the receiving optical system 4 is given. An objective lens 8 is added into the receiving optical system 4 for imaging, echo signals from a target are collected, then down-sampling is carried out through a mask plate 9, spectrum aliasing of adjacent sampling points is prevented, finally, beam shaping is carried out through a lens 10, the beam is projected to a dispersion prism 5, and photoelectric conversion is completed through a linear array detector 6. Meanwhile, the objective lens 8 is added into the receiving optical system 4, and the target image is sampled on the mask plate 9, so that the system can image a long-distance target, the size of the mask plate 9 is reduced, the size of the whole system is reduced, and the structure is compact.
As shown in fig. 4, a schematic view of an amici prism is given. The Amisy prism consists of two triangular prisms, and the emergent angle of the dispersed central wavelength light and the incident light beam are parallel by selecting the angles and the materials of the triangular prisms. The uniform thickness of the Amisy prism reduces trapezoidal distortion caused by a common prism, and further reduces the depth of field required by camera shooting, so that the aperture of the camera can be increased, the luminous flux of the system is increased, and the signal-to-noise ratio of the system is improved. Meanwhile, the light scattered by the Amisy prism and the incident light have small deflection, so all elements in the system can be placed on the same straight line, and the system structure becomes more compact.
Compared with the prior art, the invention uses the linear array detector to complete multi-wavelength four-dimensional correlation imaging of the target, does not need a scanning mechanism, simplifies an imaging system, can obtain four-dimensional image signals of the target object, and has high imaging speed and high imaging resolution; the invention uses the ultra wide band narrow pulse laser to illuminate, and utilizes the characteristics of wide spectrum range and short pulse of the ultra wide band narrow pulse laser to illuminate a target to carry out active imaging, thereby simultaneously obtaining the spectrum information and the high-precision distance information of the target; the ultra-wideband narrow pulse laser is modulated by using the digital micro-mirror device, and the digital micro-mirror device has the characteristics of high modulation rate, high spatial resolution, wide reflection spectrum band, high laser damage threshold value and presettability, so that ultra-wideband pseudo-thermal light pulses with high brightness and strong correlation characteristics can be output; the invention uses the optical telescope as the system transmitting and receiving optical system, the telescope is designed by adopting the non-spherical lens, the structure is simple, the aberration of a far field can be eliminated, and the transmitting and receiving capability of the system is improved; the invention uses the mask plate to carry out down sampling on the target echo signal on the imaging surface of the receiving optical system, thereby preventing the spectrum aliasing of adjacent sampling points; meanwhile, the luminous flux, the spatial resolution and the spectral resolution of the system can be adjusted by changing the size of the hole on the mask plate; the invention uses the Amisy prism to disperse the target echo signal, eliminates the reduction of the signal-to-noise ratio caused by trapezoidal distortion and smiling face distortion when the common prism is dispersed, increases the luminous flux of the system, reduces the deflection angles of the dispersed light and the incident light, all elements of the system can be placed on a straight line, and the system structure becomes more compact; the invention uses the linear array detector to finish the spectral imaging of the target, has high measurement sensitivity and measurement rate, can obtain a two-dimensional spectral image without a scanning mechanism, and simplifies the imaging system.
According to the introduction of the specific embodiment, the invention is a multi-wavelength correlation imaging system based on the digital micromirror device, the implementation process is simple, and the practical test verifies that the effect is obvious and the implementation is easy; the invention is used for developing a multi-wavelength correlation imaging test, the system is simple and convenient to build, the test period is short, and the compression light illumination active imaging test can be performed at any time when the system is developed in a laboratory; by setting different parameters and adjusting the structure of each component, the multi-wavelength correlation imaging test system can be used for developing a multi-platform and multi-posture multi-wavelength correlation imaging test in a large range, providing technical support for a laser active imaging test and obtaining higher resolution in more information dimensions.
The foregoing detailed description is provided for the purpose of illustrating and explaining the present invention and is not to be construed as limiting the claims. It should be clear to those skilled in the art that any simple modification, variation or replacement based on the technical solution of the present invention will result in a new technical solution, which will fall into the protection scope of the present invention.
Claims (2)
1. A multi-wavelength correlation imaging system based on a digital micro-mirror device is characterized in that:
the system comprises a laser (1), a digital micro-mirror device (2), a transmitting optical system (3), a receiving optical system (4), a dispersion prism (5), a linear array detector (6) and a computer (7); ultra-wideband laser pulses are output by a laser (1) and are incident on a digital micro-mirror device (2); the digital micro-mirror device (2) receives a modulation signal output by the computer (7), and modulates the received ultra-wideband laser pulse into a pseudo-thermal light pulse according to the modulation signal; pseudo-thermal light pulses are expanded and shaped by a transmitting optical system (3) and irradiated onto a target object, target echo signals are converged and down-sampled by a receiving optical system (4), dispersed by a dispersion prism (5) and then irradiated onto a linear array detector (6) to be converted into electric signals;
the laser (1) is an ultra-wideband narrow pulse laser with the wavelength covering visible light and near-infrared wave bands; wherein, the ultra-wideband refers to the wavelength range of 380nm-2um, and the narrow pulse refers to the time less than or equal to 200 fs;
the transmitting optical system (3) and the receiving optical system (4) are optical telescopes which are coaxial and integrated and consist of non-spherical lenses; the receiving optical system (4) comprises an objective lens, a mask plate and a lens, wherein the objective lens is used for imaging, collecting echo signals from a target, then performing down-sampling through the mask plate, and finally performing beam shaping through the lens; the mask plate is a metal film quartz substrate mask plate, wherein the size of the metal film quartz substrate mask plate is less than or equal to 2cm multiplied by 2 cm;
the dispersion prism (5) is an Amisy prism, the Amisy prism consists of two triangular prisms, and the emergent angle of the dispersed central wavelength light and the incident light beam are parallel by selecting the angles and the materials of the triangular prisms;
the linear array detector (6) is a one-dimensional orderly-arranged photoelectric detector or a one-dimensional position-sensitive photoelectric detector.
2. The multi-wavelength correlated imaging system based on digital micro-mirror device of claim 1, characterized in that: the digital micro-mirror device (2) is a Discovery series micro-mirror device produced by TI company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710895078.8A CN107942338B (en) | 2017-09-28 | 2017-09-28 | Multi-wavelength associated imaging system based on digital micromirror device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710895078.8A CN107942338B (en) | 2017-09-28 | 2017-09-28 | Multi-wavelength associated imaging system based on digital micromirror device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107942338A CN107942338A (en) | 2018-04-20 |
| CN107942338B true CN107942338B (en) | 2021-04-20 |
Family
ID=61935084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710895078.8A Active CN107942338B (en) | 2017-09-28 | 2017-09-28 | Multi-wavelength associated imaging system based on digital micromirror device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107942338B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794381A (en) * | 2019-10-22 | 2020-02-14 | 中国海洋大学 | Automatic laser color single-arm association imaging system |
| CN112824930B (en) * | 2019-11-19 | 2023-07-11 | 北京华航无线电测量研究所 | Microwave laser bidirectional coherent conversion device based on Redberg atoms |
| CN110888177B (en) * | 2019-12-12 | 2021-07-02 | 中国科学院长春光学精密机械与物理研究所 | Dark and weak target detection device under strong sky light background |
| CN111721718B (en) * | 2020-06-29 | 2023-09-01 | 北京深测科技有限公司 | Spectral imaging method and system |
| CN113298060B (en) * | 2021-07-27 | 2021-10-15 | 支付宝(杭州)信息技术有限公司 | Privacy-protecting biometric feature recognition method and device |
| CN115086550B (en) * | 2022-05-30 | 2023-04-28 | 元潼(北京)技术有限公司 | Meta imaging system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006292837A (en) * | 2005-04-06 | 2006-10-26 | Matsushita Electric Ind Co Ltd | Projection type display device |
| WO2014004555A1 (en) * | 2012-06-26 | 2014-01-03 | Kla-Tencor Corporation | Near field metrology |
| WO2017033003A1 (en) * | 2015-08-25 | 2017-03-02 | Bae Systems Plc | Imaging apparatus and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8649101B2 (en) * | 2010-08-19 | 2014-02-11 | Young Optics Inc. | Projection apparatus |
| CN103323396B (en) * | 2013-06-28 | 2015-11-11 | 中国科学院空间科学与应用研究中心 | A kind of two-dimensional compression ghost imaging system based on coincidence measurement and method |
| CN103471718B (en) * | 2013-09-13 | 2015-04-15 | 中国科学院空间科学与应用研究中心 | Hyperspectral imaging system and method based on sparse aperture compressing calculation correlation |
| CN103777206B (en) * | 2014-01-26 | 2016-04-06 | 上海交通大学 | A kind of single pixel imaging system based on polarization relevance imaging |
| CN105242280B (en) * | 2014-07-08 | 2017-07-28 | 中国科学院理化技术研究所 | A kind of relevance imaging apparatus and method based on optical parameter process |
-
2017
- 2017-09-28 CN CN201710895078.8A patent/CN107942338B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006292837A (en) * | 2005-04-06 | 2006-10-26 | Matsushita Electric Ind Co Ltd | Projection type display device |
| WO2014004555A1 (en) * | 2012-06-26 | 2014-01-03 | Kla-Tencor Corporation | Near field metrology |
| WO2017033003A1 (en) * | 2015-08-25 | 2017-03-02 | Bae Systems Plc | Imaging apparatus and method |
Non-Patent Citations (2)
| Title |
|---|
| Multispectral computational ghost imaging with multiplexed illumination;Jian Huang and Dongfeng Shi;《Journal of Optics》;20170620;1-7 * |
| Wavelength-multiplexed computational temporal ghost imaging;Ryczkowski, P等;《2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)》;20170629;696 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107942338A (en) | 2018-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107942338B (en) | Multi-wavelength associated imaging system based on digital micromirror device | |
| US10356392B2 (en) | Coded access optical sensor | |
| US10018726B2 (en) | Integrated illumination and detection for LIDAR based 3-D imaging | |
| CN109343077B (en) | Liquid crystal phased array ghost imaging system and imaging method thereof | |
| CN110579775A (en) | Ultra-long-range single-photon three-dimensional laser radar scanning imaging system | |
| US11009592B2 (en) | LiDAR system and method | |
| KR20170009882A (en) | Method and system for robust and extended illumination waveforms for depth sensing in 3d imaging | |
| US8254665B2 (en) | Systems for capturing three-dimensional one or more images and methods thereof | |
| CN104458696A (en) | Digital micro-mirror element based micro curing raman spectrometer | |
| US11231323B2 (en) | Time-resolved hyper-spectral single-pixel imaging | |
| CN111158061A (en) | Multi-dimensional information detection device and measurement method thereof | |
| CN103940514B (en) | A kind of broadband close shot ultraviolet imagery spectral device | |
| CN106643668B (en) | Atmospheric laser occultation signal generating and detecting equipment | |
| CN111141701A (en) | Rapid super-resolution imaging method and system based on terahertz single pulse | |
| CN110887564A (en) | Moving target spectrum monitoring device and monitoring method | |
| CN112698348A (en) | Single-photon three-dimensional scanning imaging system | |
| WO2020221188A1 (en) | Synchronous tof discrete point cloud-based 3d imaging apparatus, and electronic device | |
| CN115267822A (en) | High-uniformity scanning type single photon laser three-dimensional radar imaging system and imaging method | |
| CN110888177B (en) | Dark and weak target detection device under strong sky light background | |
| RU2544305C1 (en) | Laser location system | |
| CN114966739A (en) | Target detection imaging system and method based on fiber laser phased array | |
| CN104568777A (en) | Spectrum-coding-based confocal microscopy imaging device and method | |
| CN103837241A (en) | Laser pulse waveform meter | |
| CN105865626A (en) | Hyperspectral imager based on rotary filter monochromator | |
| CN110187498B (en) | True heat light correlation imaging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |