CN107421720B - Optical testing device and method for underwater back scattering transfer function - Google Patents
Optical testing device and method for underwater back scattering transfer function Download PDFInfo
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- CN107421720B CN107421720B CN201710379504.2A CN201710379504A CN107421720B CN 107421720 B CN107421720 B CN 107421720B CN 201710379504 A CN201710379504 A CN 201710379504A CN 107421720 B CN107421720 B CN 107421720B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 65
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 238000012546 transfer Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 8
- 238000003384 imaging method Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000005286 illumination Methods 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 21
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000004313 glare Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 4
- 230000031700 light absorption Effects 0.000 abstract 1
- 238000012634 optical imaging Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241000287181 Sturnus vulgaris Species 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000002310 reflectometry Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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Abstract
The invention discloses an optical testing device for an underwater backscattering transfer function, which comprises a water tank body, an optical system, a first image sensor and a second image sensor, wherein a light absorption device and suspended particles are sequentially arranged in the water tank body, the optical system is arranged outside the water tank body and used for receiving backscattering formed by the suspended particles after an imaging target receives illumination, the first image sensor and the second image sensor are arranged on an optical axis of the optical system and used for receiving images at different focal plane positions, the backscattering images are synchronously collected according to the first image sensor and the second image sensor, and the backscattering optical transfer function is obtained by analyzing the difference between the images. The invention utilizes the characteristic that the transfer function of the backscattering in the optical system is not randomly changed, and can provide accurate and stable optical parameters for the development of the underwater optical system.
Description
Technical field
The present invention relates to the optical testing devices and method of a kind of underwater back scattering transmission function.
Background technique
Back scattering is to restrict the principal element of underwater optics imaging operating distance.However due to the randomness of scattering, lead
It causes the optical characteristics of back scattering to be difficult to extract, stares quality of optical imaging under water and be difficult to improve.
Summary of the invention
The present invention to solve the above-mentioned problems, propose a kind of underwater back scattering transmission function optical testing device and
Method, transmission function of the present invention by test back scattering in optical system, obtains accurate, stable optical parameter, is
The development of underwater high-performance optical imaging system provides data and supports.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of optical testing device of underwater back scattering transmission function, including water tank, optical system, the first image pass
Sensor and the second imaging sensor, wherein light absorbing device and suspended particulate, the optical system are disposed in the water tank
System is set to outside water tank, is received imageable target and is received the back scattering formed after illumination by suspended particulate, first figure
As sensor and the second imaging sensor are installed on the optical axis of optical system, the image of different positions of focal plane is acquired, according to
The image of one imaging sensor and the second imaging sensor synchronous acquisition back scattering passes through the difference between both analyses image
It is different, obtain the optical transfer function of back scattering.
Further, the first image sensor and the second imaging sensor are deposited relative to the equivalent light path of optical system
In axial spacing.
Further, the axial spacing Δ f meets
Wherein, λ is the central wavelength of illumination light, and NA is image-side numerical aperture.
Further, illumination is issued by light source, and the irradiating angle of the light source is adjustable.
Forward scattering and back scattering occur for scattering particles of the illumination of light source transmitting into water tank, wherein before
It is received to scattering and remaining illumination light by light absorbing device.
Further, back scattering enters optical system, is divided into two beams by beam-splitter, a branch of to image in the first image
Sensor, another beam image in the second imaging sensor.
The scattering particles is suspended in the liquid of water tank.
The light absorbing device is installed on the side of water tank, for absorbing additional veiling glare.
First imaging sensor and the second imaging sensor are communicated with controller, and controller is by back scattering NbAs imaging
Target, defocus distance are the back scattering of f image planes as UbAre as follows:
Wherein, * is convolution algorithm, and P is the point spread function of optical system, and x, y are image space cartesian coordinate system, r,For
Object space polar coordinate system, f are defocusing amount.Defocus distance is the back scattering of f+ Δ f image planes as Ub' are as follows:
Transmission function of the back scattering in axial spacing between two image planes of Δ f are as follows:
For Fourier transformation.
A kind of optical test method of underwater back scattering transmission function, optical system receive the backward of scattering particles and dissipate
It penetrates, acquires the image of optical system difference position of focal plane, by the difference between both analyses image, obtain the light of back scattering
Learn transmission function.
Compared with prior art, the invention has the benefit that
Transmission function of the present invention by test back scattering in optical system, obtains accurate, stable optical parameter,
Data be provided support for the development of underwater high-performance optical imaging system, at the same the present invention have the advantages that it is inexpensive, high-precision,
It is applied widely, the optical parameter of accurate stable can be provided for the development of underwater optics system.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is optical testing device schematic diagram of the invention；
Fig. 2 is image collecting device schematic diagram of the invention；
In figure: 1, light absorbing device, 2, scattering particles, 3, water tank, 4, optical system, the 5, first imaging sensor, 6, point
Tabula rasa, the 7, second imaging sensor, 8, light source, 9, equivalent light path axial spacing.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, the prior art, which exists in the prior art, can not overcome the randomness of scattering, cause
The optical characteristics of back scattering is difficult to extract, the deficiency that underwater optics image quality is difficult to improve, in order to solve technology as above
Problem, present applicant proposes the optical testing devices and method of a kind of underwater back scattering transmission function.
In a kind of typical embodiment of the application, as shown in Figure 1, the optic test of underwater back scattering transmission function
Device is by light absorbing device 1, scattering particles 2, water tank 3, optical system 4, the first imaging sensor 5, beam-splitter 6, the second image
Sensor 7, light source 8 form.
Scattering particles 2 is suspended in the liquid of water tank 3, and the illumination scattering particles 2 that light source 8 emits is to generate
Back scattering.
Light absorbing device 1 is installed on the side of water tank 3, for absorbing additional veiling glare, and optical system 4, the first image
Sensor 5, beam-splitter 6, the second imaging sensor 7 constitute the acquisition device of rear orientation light, the acquisition device of rear orientation light
The other side of water tank 3 is installed on light source 8.Light absorbing device uses array pyramidal structure, and material has good extinction characteristic
(antiradar reflectivity).
First imaging sensor 5 and the second imaging sensor 7 are installed on the optical axis of optical system 4, to acquire light
The image of the position of focal plane of system 4, the first imaging sensor 5 and the second imaging sensor 7 are relative to the equivalent of optical system 4
Optical path has axial spacing 9.For optical system 4, it is desirable that it has enough rear cut-off distances that can install two imaging sensors
And optical splitter.
To the scattering particles in water tank 3 forward scattering and back scattering occur for the illumination that light source 8 emits, wherein
Forward scattering and remaining illumination light are received by light absorbing device 1, and are scattered through water tank 3 backward, into optical system 4,
Back scattering is divided into two beams by beam-splitter 6, and a branch of to image in the first imaging sensor 5, another beam images in the second image
Sensor 7.
The image of 7 synchronous acquisition back scattering of first imaging sensor 5 and the second imaging sensor passes through both analyses figure
Difference as between obtains the optical transfer function of back scattering in optical imaging systems.
By back scattering NbAs imageable target, defocus distance is the back scattering of f image planes as UbAre as follows:
Wherein, * is convolution algorithm, and P is the point spread function of optical system, and x, y are image space cartesian coordinate system, r,For
Object space polar coordinate system, f are defocusing amount.Defocus distance is the back scattering of f+ Δ f image planes as Ub' are as follows:
Wherein, λ is the central wavelength of illumination light, and NA is image-side numerical aperture.Back scattering is Δ f two in axial spacing
Transmission function between image planes are as follows:
For Fourier transformation.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (8)
1. a kind of optical testing device of underwater back scattering transmission function, it is characterized in that: including water tank, optical system, the
One imaging sensor and the second imaging sensor, wherein light absorbing device and scattering particles, institute are disposed in the water tank
It states optical system to be set to outside water tank, receives imageable target and receive the back scattering formed after illumination by suspended particulate, institute
It states the first imaging sensor and the second imaging sensor is installed on the optical axis of optical system, receive the figure of different positions of focal plane
Picture passes through both analyses image according to the image of the first imaging sensor and the second imaging sensor synchronous acquisition back scattering
Between difference, obtain the optical transfer function of back scattering；
There are axial spacing Δs relative to the equivalent light path of optical system for the first image sensor and the second imaging sensor
F meets
Wherein, λ is the central wavelength of illumination light, and NA is image-side numerical aperture.
2. a kind of optical testing device of underwater back scattering transmission function as described in claim 1, it is characterized in that: illumination by
Light source issues, and the irradiating angle of the light source is adjustable.
3. a kind of optical testing device of underwater back scattering transmission function as claimed in claim 2, it is characterized in that: light source is sent out
Forward scattering and back scattering occur for scattering particles of the illumination penetrated into water tank, wherein forward scattering and remaining
Illumination light is received by light absorbing device.
4. a kind of optical testing device of underwater back scattering transmission function as described in claim 1, it is characterized in that: backward dissipate
It injects into optical system, is divided into two beams by beam-splitter, a branch of to image in the first imaging sensor, another beam images in second
Imaging sensor.
5. a kind of optical testing device of underwater back scattering transmission function as described in claim 1, it is characterized in that: described dissipate
Radion is suspended in the liquid of water tank.
6. a kind of optical testing device of underwater back scattering transmission function as described in claim 1, it is characterized in that: the suction
Electro-optical device is installed on the side of water tank, for absorbing additional veiling glare.
7. a kind of optical testing device of underwater back scattering transmission function as described in claim 1, it is characterized in that:
First imaging sensor and the second imaging sensor are communicated with controller, and controller is by back scattering NbAs imageable target,
Defocus distance is the back scattering of f image planes as UbAre as follows:
Wherein, * is convolution algorithm, and P is the point spread function of optical system, and x, y are image space cartesian coordinate system, r,For object space
Polar coordinate system, f are defocusing amount, and defocus distance is the back scattering of f+ Δ f image planes as Ub' are as follows:
Transmission function of the back scattering in axial spacing between two image planes of Δ f are as follows:
For Fourier transformation.
8. a kind of survey of the optical testing device based on the described in any item underwater back scattering transmission functions of such as claim 1-7
Method for testing acquires the figure of optical system difference position of focal plane it is characterized in that: optical system receives the back scattering of scattering particles
Picture obtains the optical transfer function of back scattering by the difference between both analyses image.
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| CN109506767B (en) * | 2018-10-24 | 2020-12-08 | 西北工业大学 | Real-time detection method for sound field abnormity caused by underwater invasion target |
| CN114486196B (en) * | 2022-01-27 | 2022-11-04 | 中国科学院长春光学精密机械与物理研究所 | Optical transfer function measuring instrument |
Citations (4)
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|---|---|---|---|---|
| CN101813558A (en) * | 2010-04-29 | 2010-08-25 | 苏州大学 | Device for measuring modulation transfer function of optical system and method thereof |
| CN102735429A (en) * | 2012-06-13 | 2012-10-17 | 中国科学院长春光学精密机械与物理研究所 | Equipment for CCD (Charge Coupled Device) modulation transfer function test and testing method of equipment |
| JP5641178B2 (en) * | 2009-07-17 | 2014-12-17 | 日本電信電話株式会社 | Optical reflectometry measuring method and optical reflectometry measuring apparatus |
| CN104330245A (en) * | 2014-11-21 | 2015-02-04 | 大连海事大学 | Wave front coding imaging system focus plane position test method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2824704A1 (en) * | 2013-08-26 | 2015-02-26 | Alastair Malarky | Methods and systems for determining a range rate for a backscatter transponder |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5641178B2 (en) * | 2009-07-17 | 2014-12-17 | 日本電信電話株式会社 | Optical reflectometry measuring method and optical reflectometry measuring apparatus |
| CN101813558A (en) * | 2010-04-29 | 2010-08-25 | 苏州大学 | Device for measuring modulation transfer function of optical system and method thereof |
| CN102735429A (en) * | 2012-06-13 | 2012-10-17 | 中国科学院长春光学精密机械与物理研究所 | Equipment for CCD (Charge Coupled Device) modulation transfer function test and testing method of equipment |
| CN104330245A (en) * | 2014-11-21 | 2015-02-04 | 大连海事大学 | Wave front coding imaging system focus plane position test method and device |
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