CN109343075A - For differentiating the laser polarization detection system of submarine target - Google Patents
For differentiating the laser polarization detection system of submarine target Download PDFInfo
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- CN109343075A CN109343075A CN201811233566.3A CN201811233566A CN109343075A CN 109343075 A CN109343075 A CN 109343075A CN 201811233566 A CN201811233566 A CN 201811233566A CN 109343075 A CN109343075 A CN 109343075A
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- polarizing beamsplitter
- photodetector
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- submarine target
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- 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
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Abstract
Laser polarization detection system for differentiating submarine target belongs to marine optics Polarization Detection technical field.The prior art can not judge the material of submarine target.The detection system of the present invention includes laser, imaging system, polarizing beamsplitter, photodetector and computer, and imaging system and polarizing beamsplitter are total to optical path, and photodetector is located on the emitting light path of polarizing beamsplitter, and computer is connect with photodetector；A polarizing beamsplitter is respectively arranged on spectroscopical two emitting light paths of energy in the optical path between imaging system and polarizing beamsplitter in energy spectroscope；Relative to energy spectroscope, two polarizing beamsplitter space arrangement postures are different, and a polarizing beamsplitter is emitted 0 °, 90 ° of polarised lights, another polarizing beamsplitter is emitted 45 °, 135 ° of polarised lights；A photodetector is respectively set on two emitting light paths of each polarizing beamsplitter, each photodetector is connect with computer, sends the light intensity electric signal detected to computer.
Description
Technical field
The present invention relates to a kind of for differentiating the laser polarization detection system of submarine target, belongs to marine optics Polarization Detection
Technical field.
Background technique
Marine survey technology is the basis of ocean engineering technology, therefore, to realize the development and utilization of the marine resources such as energy,
Marine survey technology must be grasped.Imaging circumstances in natural water are complicated and changeable, influence many because being known as of image quality, packet
Hydrone itself and wherein various organic and inorganic impurity, bubble, turbulent flow etc. are included, therefore, the detection for submarine target, such as
Identification and detection, detection of the difficulty much larger than target in normal atmosphere.But, there is a light transmissions for this natural water of ocean
The light wave propagation attenuation degree of rate high " ocean window ", that is, 470~580nm wave band, the wave band is minimum, the transmission of light
Rate highest, thus, bluish-green laser becomes the lighting source of ocean submarine target active probe.
Underwater laser detection technology becomes a kind of marine survey technology.Underwater laser detection technology includes two classes, first is that directly
Detection, also referred to as energy detection are connect, second is that optical heterodyne detection, also referred to as coherent detection.Direct detection is that photoelectric detecting system is directly rung
Stress optical echo light field Strength Changes, and echo light field is correspondingly converted into the variable signal of voltage or current.Outside light
Difference detection is the mixed frequency signal of photoelectric detecting system response echo signal Yu local oscillator light wave, and the frequency of return laser beam light field is utilized
With two physical quantitys of phase change.The former influenced by underwater environment it is smaller, it can only obtain measured target azimuth-range
Information；The latter requires strictly, to be affected, made by sea water opacity to the time-space relationship of received echo-signal and local oscillator light wave
Mixing efficiency is greatly lowered.But, polarization optical detection in identification target, improves mesh as a kind of widely used detection means
Mark has unique advantage with the contrast of background, inverting measured target physical characteristic etc., can accurately, mesh is clearly provided
The information such as target surface roughness, texture trend, surface conductivity, the physicochemical property of material, water content.Existing polarization optical detection
Technology is maturely applied to the following aspects.Sea surface small target imaging, according to the infrared polarization state of swimmer by its with
Background is distinguished；The imaging of land mine infrared polarization the characteristics of according to LONG WAVE INFRARED, utilizes LONG WAVE INFRARED polarized component to identify land mine；Vehicle
And building imaging, also with distinguishing vehicle with the polarization information difference on vehicle window, roof the characteristics of LONG WAVE INFRARED and build
Build object.Only the detection environment of the above polarization optical detector technology is atmosphere, using infrared light as probe source.
2015, an entitled " compressed sensing based underwater polarised light from Xi'an optical precision optical machinery research institute
Imaging technique research " paper disclose it is a kind of will polarize optical detector technology be applied to Underwater Target Detection scheme, detection
System includes the parts such as laser, image-forming objective lens, polarizing beamsplitter, photomultiplier tube, CCD, computer.Optical maser wavelength is in
" ocean window ".Image-forming objective lens point preceding group, rear group, preceding group is cemented doublet, and rear group is three dialyte lenses, needed for capable of obtaining
Image quality.Polarizing beamsplitter divides two-way to be emitted crossed polarized light, finally again by computer reconstruction image.However, the detection system
System is only used for the imaging of submarine target, identifies the general profile of submarine target, can not but judge the material of submarine target.
Summary of the invention
It is an object of the present invention to, under water in the detection process of target, identify the material of submarine target, it accordingly will be underwater
Target is distinguished from background, for this purpose, we have invented a kind of for differentiating the laser polarization detection system of submarine target.
The laser polarization detection system for differentiating submarine target of the present invention includes laser, imaging system, polarisation point
Shu Jing, photodetector and computer, laser light path is independent, and optical maser wavelength is 470~580nm, imaging system and polarisation point
Beam mirror is total to optical path, and photodetector is located on the emitting light path of polarizing beamsplitter, and computer is connect with photodetector；Its feature
It is, energy spectroscope is in the optical path between imaging system and polarizing beamsplitter, in spectroscopical two emergent lights of energy
A polarizing beamsplitter is respectively arranged in road；Relative to energy spectroscope, two polarizing beamsplitter space arrangement postures are different, and one
Polarizing beamsplitter is emitted 0 °, 90 ° of polarised lights, another polarizing beamsplitter is emitted 45 °, 135 ° of polarised lights；In each polarized beam splitting
A photodetector is respectively set on two emitting light paths of mirror, each photodetector is connect with computer, will be detected
Light intensity electric signal send computer to.
It has technical effect that the vertical water surface irradiation submarine target of laser, imaging system probes into the water surface to the present invention, receives
The reflected light that carry submarine target polarization information, using amplitude type Polarization Detection technology is divided, which passes through level-one energy
After light splitting and level-one polarization beam splitting, light intensity signal all the way, i.e. I are respectively exported by four photodetectors0°、I45°、I90°And I135°, most
Calculate the degree of polarization P of reflected light according to following formula by computer afterwards:
In formula: S0Indicate the reflected light total light intensity that imaging system receives；S1Indicate inclined on linear 0 ° or 90 ° of directions
Vibration amount；S2Indicate the amount of polarization on linear 45 ° or 135 ° of directions；S0、S1、S2It is provided respectively by formula (2), (3), (4):
S1=I0°-I90° (3)
S2=I45°-I135° (4)
Submarine target material is different, and the degree of polarization of reflected light is also different, anti-in material submarine target known to leading detect
It penetrates after polarization degree, establish database and is stored in computer, during detection material unknown submarine target, repeat to visit
Survey process, detection data and database are compared, to obtain the material information of submarine target." ocean window " Polarization Detection energy
Enough will interfere as caused by underwater complex environment is preferably minimized, and improves detection signal-to-noise ratio.
Of the invention one incidentally has technical effect that fast response time, to detect more acurrate.Existing atmospheric environment is red
Epipolarized light Detection Techniques are detected by the way of rotatory polarization piece, and polarizing film rotation is primary to survey primary, four completion I0°、
I45°、I90°、I135°Measurement, belong to single channel timesharing measurement, this mode is not suitable for dynamic object because, it is primary in measurement
Later, the position of target has occurred that variation, next to measure obtained measured value inaccuracy.And the present invention is to divide amplitude
It measures, belong to multichannel while measuring simultaneously, while obtaining I0°、I45°、I90°、I135°, therefore response speed is faster, detects more quasi-
Really.
Another of the invention incidentally has technical effect that detection contrast is high, so that detection accuracy is higher.Background technique
In underwater Polarization Detection be two-way measure simultaneously, tetra- road Ze Wei of the present invention measures simultaneously, the submarine target polarization information of acquisition
More, so improve submarine target and background contrast so that detection accuracy is higher.The degree of polarization of script made Target is universal
Higher than the degree of polarization of natural target, accordingly, the present invention can easily be distinguished artificial submarine target with background.
Detailed description of the invention
Fig. 1 is the present invention for differentiating the laser polarization detection system structure and detection process schematic diagram of submarine target,
The figure is used as Figure of abstract simultaneously.Fig. 2~Fig. 4 is successively the present invention for differentiating the laser polarization detection system of submarine target
In imaging system transfer curve figure, wave aberration figure, distortion curve.
Specific embodiment
The present invention includes laser 1, imaging system 2, polarisation for differentiating the laser polarization detection system of submarine target
Beam splitter 3, photodetector 4 and computer 5, as shown in Figure 1.
1 optical path of laser is independent, and it is the 1064nm fundamental frequency times by Nd:YAG that optical maser wavelength, which is 470~580nm, such as 532nm,
Gained after frequency.
One quarter wave plate 6 is set on 1 emitting light path of laser, converts circle for the linearly polarized light being emitted from laser 1
Polarised light, under the premise of laser intensity is identical, circularly polarized light is more farther than linearly polarized light transmission, identical in detection range in other words
Under the premise of, light intensity is stronger when circle polarization illumination is mapped to submarine target 7.
Imaging system 2 and polarizing beamsplitter 3 are total to optical path, and photodetector 4 is located on the emitting light path of polarizing beamsplitter 3,
Computer 5 is connect with photodetector 4.Energy spectroscope 8 is in the optical path between imaging system 2 and polarizing beamsplitter 3,
A polarizing beamsplitter 3 is respectively set on two emitting light paths of energy spectroscope 8；Relative to energy spectroscope 8, two polarisations point
3 space arrangement posture of beam mirror is different, and a polarizing beamsplitter 3 is emitted 0 °, 90 ° of polarised lights, the outgoing of another polarizing beamsplitter 3
45 °, 135 ° of polarised lights；A photodetector 4, Ge Geguang is respectively set on two emitting light paths of each polarizing beamsplitter 3
Electric explorer 4 is connect with computer 5, sends the light intensity electric signal detected to computer 5.
The effect of imaging system 2 is to receive, converge reflected light, and obtaining high quality gray level image.For this purpose, imaging system 2
Using double gauss optical system, focal length 108mm, service band is 531~533nm, and F number is 2.6, can eliminate coma,
Distortion and ratio chromatism, aberration are sufficiently corrected, as shown in Figure 2 to 4.When photodetector 4 is using CCD, high quality
Gray level image be conducive to CCD and be converted to accurate energy value, to improve detection accuracy.
Imaging system 2 uses collimating optical system, especially when photodetector 4 is using PIN diode, is convenient for
PIN diode works in linear zone.
It, will basis in detection process due to the laser polarization detection system for being used to differentiate submarine target using the present invention
Energy information calculates degree of polarization, therefore, the voltage of the detectable signal of the energy and output for the signal that photodetector 4 detects
The linearity will centainly be got well, and in various photoelectric detectors, CCD, the linearity of PIN diode are best, therefore, in the present invention
Photodetector 4 use CCD or PIN diode.
One polarizing beamsplitter 3 is identical as the space arrangement posture of energy spectroscope 8, is emitted 0 °, 90 ° of polarised lights；It is another
The initial space arrangement posture of a polarizing beamsplitter 3 is identical as energy spectroscope 8, then then rotates on optical axis 45 °, 45 ° of outgoing,
135 ° of polarised lights.
Using the present invention for differentiating the underwater of known material that the laser polarization detection system of submarine target detects
The polarization information of target is as shown in the table.
| Submarine target material | S0 | S1 | S2 | P |
| Ceramic (ceramic tile) | 0.368×10-10 | 0.756×10-10 | -0.509×10-10 | 0.55 |
| Iron (iron plate) | 2.78×10-9 | -4.01×10-10 | -1.28×10-9 | 0.48 |
| Plastics (plastic pipe) | 1.24×10-9 | 3.93×10-12 | -3.97×10-10 | 0.32 |
| Timber (plank) | 0.93×10-10 | 0.35×10-10 | 0.014×10-10 | 0.07 |
On the basis of further accumulation data, the material of submarine target to be measured can be accurately detected using the present invention
Matter.
Claims (5)
1. a kind of for differentiating the laser polarization detection system of submarine target, including laser (1), imaging system (2), polarisation point
Shu Jing (3), photodetector (4) and computer (5), laser (1) optical path is independent, and optical maser wavelength is 470~580nm, imaging
Optical path, photodetector (4) are located on the emitting light path of polarizing beamsplitter (3) altogether for system (2) and polarizing beamsplitter (3), calculate
Machine (5) is connect with photodetector (4)；It is characterized in that, energy spectroscope (8) is located at imaging system (2) and polarizing beamsplitter
(3) in the optical path between, a polarizing beamsplitter (3) is respectively set on two emitting light paths of energy spectroscope (8)；Relative to
Energy spectroscope (8), two polarizing beamsplitter (3) space arrangement postures are different, a polarizing beamsplitter (3) be emitted 0 °, 90 ° partially
Shake light, another polarizing beamsplitter (3) is emitted 45 °, 135 ° of polarised lights；In two emitting light paths of each polarizing beamsplitter (3)
Upper one photodetector (4) of each setting, each photodetector (4) connect with computer (5), by the light intensity detected electricity
Signal sends computer (5) to.
2. according to claim 1 for differentiating the laser polarization detection system of submarine target, which is characterized in that in laser
One quarter wave plate (6) is set on device (1) emitting light path, converts circularly polarized light for the linearly polarized light being emitted from laser (1).
3. according to claim 1 for differentiating the laser polarization detection system of submarine target, which is characterized in that imaging system
(2) are united using double gauss optical system or collimating optical system.
4. according to claim 1 for differentiating the laser polarization detection system of submarine target, which is characterized in that photoelectricity is visited
It surveys device (4) and uses CCD or PIN diode.
5. according to claim 1 for differentiating the laser polarization detection system of submarine target, which is characterized in that one partially
Light beam splitter (3) is identical as the space arrangement posture of energy spectroscope (8), is emitted 0 °, 90 ° of polarised lights；Another polarized beam splitting
The initial space arrangement posture of mirror (3) is identical as energy spectroscope (8), then then rotates on optical axis 45 °, outgoing 45 °, 135 ° partially
Shake light.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811233566.3A CN109343075A (en) | 2018-10-23 | 2018-10-23 | For differentiating the laser polarization detection system of submarine target |
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| CN201811233566.3A CN109343075A (en) | 2018-10-23 | 2018-10-23 | For differentiating the laser polarization detection system of submarine target |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141389A (en) * | 2020-02-20 | 2020-05-12 | 长春理工大学 | Device and method for measuring transmission characteristics of polarized light in underwater environment |
| CN113834639A (en) * | 2021-09-29 | 2021-12-24 | 中国科学院长春光学精密机械与物理研究所 | Distortion eliminating ultramicro-nano optical system based on pixel-level polaroid |
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| CN101567520A (en) * | 2009-05-26 | 2009-10-28 | 长春理工大学 | Hollow beam pumping emission semiconductor laser of vertical external chamber surface |
| CN108418637A (en) * | 2018-05-10 | 2018-08-17 | 长春理工大学 | Underwater anti-turbulent flow high-speed optical soliton communication system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567520A (en) * | 2009-05-26 | 2009-10-28 | 长春理工大学 | Hollow beam pumping emission semiconductor laser of vertical external chamber surface |
| CN108418637A (en) * | 2018-05-10 | 2018-08-17 | 长春理工大学 | Underwater anti-turbulent flow high-speed optical soliton communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141389A (en) * | 2020-02-20 | 2020-05-12 | 长春理工大学 | Device and method for measuring transmission characteristics of polarized light in underwater environment |
| CN113834639A (en) * | 2021-09-29 | 2021-12-24 | 中国科学院长春光学精密机械与物理研究所 | Distortion eliminating ultramicro-nano optical system based on pixel-level polaroid |
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Application publication date: 20190215 |