CN101699312A - Device for improving object imaging quality in scattering medium through intensity association - Google Patents
Device for improving object imaging quality in scattering medium through intensity association Download PDFInfo
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Abstract
The invention discloses a device for improving object imaging quality in a scattering medium through intensity association, which comprises a heat light source. A dispersion prism is arranged along a forward direction of a light beam emitted by the heat light source. The dispersion prism divides the light beam into a transmittance beam and a reflection beam. The transmittance beam direction of the dispersion prism is sequentially provided with an object light path collimating lens, an object to be tested in the scattering medium, an object light path imaging lens and an object light path area detector. The reflection beam direction of the dispersion prism is sequentially provided with a reference light path collimating lens and a reference light path area detector. The output ends of the object light path area detector and the reference light path area detector are simultaneously connected with a computer having acquired light strong distribution information and performing intensity associational operation. The heat light source, the object light path area detector and the reference light path area detector are synchronously triggered by a synchronizing signal generator simultaneously and are controlled to work synchronously. The device can greatly improve the imaging quality of the object in the scattering medium.
Description
Technical field
The invention belongs to optical imaging field, specifically a kind of intensity correlation improves the device of object imaging quality in the scattering medium.
Background technology
In traditional imaging and message transmitting procedure, owing to there is repeatedly scattering, information transmission and image quality will be seriously influenced.Such as under atmospheric environment,, will influence the measuring accuracy of laser radar, the fidelity of satellite communication information transmission and the light image quality in atmosphere owing to the scattering of multiple particle in the atmosphere; In particle physics,, thereby cause the decline of image quality because atomic nucleus is to the scattering of some microscopic particles; And in life and medical science, because biological tissue belongs to high scattering tissue, repeatedly scattering causes the accuracy of the detection diagnosis of pathology and validity and image quality have been caused tremendous influence.For the imaging in the scattering medium, the x-ray imaging that is applied in the clinical medicine, CT, ultrasonic imaging, Magnetic resonance imaging etc. have just successively been produced.Started the focus of optical image technology research in recent years again, be developed into the optical image technology that utilizes under the multiple gate technique control, as gate techniques such as space door, polarization door, time gate, relevant doors, these technology utilize photon to distinguish photon and the noise background photon that is used for imaging through the variation of some character after the scattering; Realized optical image technology of optical coherence tomography, diffuse reflection optics chromatographic technique, optoacoustic chromatographic technique, ultrasonic modulation or the like.Though above-mentioned technology has had certain improving to the image quality in the scattering medium, yet there is certain limitation in they: what have exists ionising radiation, and the spatial resolution that has is too low, and the information distortion that has is bigger; The cost that has and operating cost costliness or the like; Thereby the extraction of high quality graphic and information remains a great problem that faces now in the scattering medium.
Summary of the invention
Exist the defective of the low and poor signal to noise of image resolution ratio at above-mentioned existing optical image technology, the technical problem to be solved in the present invention provides the device that a kind of intensity correlation improves object imaging quality in the scattering medium.There is high scattering medium and reference path does not have under the situation of scattering medium in the thing light path, carries out related computing, just can obtain being in the high-quality image of object under test in the high scattering medium by strength information to thing light path and reference path surface detector record.
For solving the problems of the technologies described above, technical solution of the present invention is as follows:
A kind of intensity correlation improves the device of object imaging quality in the scattering medium, characteristics are that the formation of this device comprises thermal light source, the working direction of the light beam that sends along this thermal light source is provided with Amici prism, this Amici prism is divided into transmitted light path and reflected light path with light beam: transmitted light path is called the thing light path because of containing object under test; Its by thing beam path alignment lens, be in object under test in the high scattering medium, thing light path imaging lens and form by the thing light path surface detector of certain space resolution characteristic.Reflected light path is called reference path because of no object under test; It is formed by the reference path collimation lens with by the reference path surface detector of high-space resolution ability.The output terminal of described thing light path surface detector and reference path surface detector is connected to have simultaneously gathers light distribution information data and the computing machine that carries out the intensity correlation computing; The test surface of described reference path surface detector satisfies following relationship to the distance z at described reference path collimation lens center:
Wherein: z
1For the center of thing beam path alignment lens and to the distance between the object under test, f is the focal length of reference path collimation lens, f
1Focal length for thing beam path alignment lens; Described thermal light source is synchronoused working by a synchronous generator synchronous triggering control simultaneously with thing light path surface detector and reference path surface detector.
The thermal light source of apparatus of the present invention is synchronoused working a synchronous generator synchronous triggering control with thing light path surface detector and reference path surface detector, and the course of work comprises:
(1), the light beam that sends of thermal light source after the Amici prism beam split, transmitted light beam obtains directional light by thing beam path alignment lens and arrives thing light path surface detector through object under test, the thing light path imaging lens that are in the high scattering medium successively;
(2), by the in time variation light intensity signal of thing light path surface detector reception from object under test;
(3), folded light beam arrives the reference path surface detector after becoming directional light by the reference path collimation lens, receives light intensity signal from thermal light source by this reference path surface detector at diverse location;
(4), with the light distribution information stores of the corresponding record constantly of thing light path surface detector and reference path surface detector in computing machine;
(5), in computing machine, carry out the intensity correlation computing to what thing light path " face " detector received from the intensity signal of object under test and the light distribution information of reference path, can obtain the simple crosscorrelation strength distributing information of thing light path and reference path, be the high-quality image of object under test.
Described computing machine carries out the intensity correlation operational method:
The light intensity value of corresponding position on the light intensity value at diverse location place on a certain moment thing light path surface detector and the reference path surface detector is carried out related operation, obtain the related distribution of combined strength bination of thing light path and reference path, the combined strength bination that again difference is obtained constantly distributes and carries out statistical average, just can obtain the simple crosscorrelation strength distributing information of thing light path and reference path.
Compared with prior art, the present invention has following technique effect:
1, the picture quality because of total system is determined simultaneously by thing light path system and reference path system, do not have in reference path under the situation of scattering, existing scattering medium imaging technique all can be used as the thing light path of intensity correlation imaging system, thereby the picture quality that intensity correlation obtains all can further improve on existing scattering medium imaging technique basis significantly.
2, in imaging process in the past, detection system and imaging system are inseparable; And for this device, detection system is separated with imaging system, and the thing light path belongs to detection system, and reference path is used for imaging.
3, the object under test image magnification ratio of Huo Deing is only determined by the focal distance ratio of two beam path alignment lens.
4, just can obtain different distance z owing to only change the test surface of reference path surface detector and the distance z at collimation lens center
1The time body surface real image, thereby the tomographic map information of easier realization object.
5, can obtain all very high tomographic map of lateral resolution and longitudinal frame.
6, radiationless, undamaged optical imagery.
Description of drawings
Fig. 1 is the structural representation that intensity correlation of the present invention improves the device of object imaging quality in the scattering medium.
Among the figure: the 1st, thermal light source; The 2nd, Amici prism; The 3rd, thing beam path alignment lens; The 4th, scattering medium and the object under test that is in the scattering medium; The 5th, thing light path imaging lens; The 6th, thing light path surface detector; The 7th, the reference path collimation lens; The 8th, the reference path surface detector; The 9th, computing machine.
Fig. 2 is the object under test in the scattering medium.
Fig. 3 is thing light path and reference path surface detector spatial resolving power when being " 6.45 μ m * 6.45 μ m ", and the subject image that obtains after the intensity correlation computing is carried out in the light distribution that the light distribution of thing light path surface detector record and reference path write down.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
See also Fig. 1 earlier, Fig. 1 is the structural representation that intensity correlation of the present invention improves the device of object imaging quality in the scattering medium.As seen from the figure, intensity correlation of the present invention improves the device of object imaging quality in the scattering medium, its formation comprises thermal light source 1, the working direction of the light beam that sends along this thermal light source 1 is provided with Amici prism 2, this Amici prism 2 is divided into transmitted light beam and folded light beam with light beam, is thing beam path alignment lens 3 successively in the transmitted light beam direction of this Amici prism 2, is in object under test 4, thing light path imaging lens 5 and thing light path surface detector 6 in the scattering medium; Folded light beam direction at described Amici prism 2 is reference path collimation lens 7 and reference path surface detector 8 successively, and the output terminal of described thing light path surface detector 6 and reference path surface detector 8 is connected to have simultaneously gathers light distribution information data and the computing machine 9 that carries out the intensity correlation computing; The test surface of described reference path surface detector 8 satisfies following relationship to the distance z at described reference path collimation lens 7 centers:
Wherein: z
1For the center of thing beam path alignment lens 3 and to the distance between the object under test 4, f is the focal length of reference path collimation lens 7, f
1Focal length for thing beam path alignment lens 3; Described thermal light source 1 is synchronoused working by a synchronous generator (not shown) synchronous triggering control simultaneously with thing light path surface detector 6 and reference path surface detector 8.
The thermal light source of apparatus of the present invention is synchronoused working a synchronous generator synchronous triggering control with thing light path surface detector and reference path surface detector, and the course of work comprises:
(1), thermal light source 1 after Amici prism 2 beam split, transmitted light beam obtains directional light successively through being in object under test 4 (see figure 2)s in the high scattering medium by thing beam path alignment lens 3; Then through the thing light path imaging lens 5 of object image-forming to be measured being arrived thing light path surface detector 6;
(2), the light intensity signal that receives from object under test 4 by thing light path surface detector 6;
(3), the intensity signal of thing light path surface detector 6 records is stored in the computing machine 9;
(4), folded light beam arrives reference path surface detector 8 after obtaining directional light by reference path collimation lens 7, the light intensity signal that is received from thermal light source by reference path surface detector 8;
(5), the light distribution information stores of reference path surface detector 8 record in computing machine 9;
(6), the light distribution information of object under test intensity signal that thing light path surface detector 6 is received and reference path surface detector 8 records is carried out the intensity correlation computing in computing machine 9, obtain the simple crosscorrelation strength distributing information of thing light path and reference path, be the high-quality image (see figure 3) of object under test;
Described computing machine carries out the intensity correlation calculating process:
With diverse location x on the thing light path surface detector 6
tThere is light intensity value I constantly in the place
t(x
t) with reference path surface detector 8 on correspondence position x
rThe light intensity value I at place
r(x
r) carry out related computing as follows:
ΔG
(2，2)(x
r，x
t)≡<ΔI
r(x
r)ΔI
t(x
t)>＝<I
r(x
r)I
t(x
t)>-<I
t(x
r)><I
t(x
t)> (3)
Be the simple crosscorrelation strength distributing information of thing light path and reference path, this distributed intelligence is exactly the high-quality image of object under test.
In Fig. 2, object under test 4 be transmission-type " in " the word ring, its minimal characteristic yardstick is 60.0 μ m.Annulus left side with " in " standoff distance in word left side is 120.0 μ m.For traditional imaging,, will make that the image information of object is flooded substantially fully because strong scattering process causes the resolution of image and signal to noise ratio (S/N ratio) sharply to descend.Fig. 3 is thing light path surface detector 6 and reference path surface detector 8 spatial resolving powers when being " 6.45 μ m * 6.45 μ m ", and the subject image that obtains after the intensity correlation computing is carried out in the light distribution that the light distribution of thing light path surface detector record and reference path surface detector 8 write down.Can not differentiate the object under test 4 that is in the high scattering medium with the common formation method of tradition, but demonstrate: utilize the present invention to pass through the intensity correlation computing by Fig. 3, can obtain more clearly as, show that the present invention has improved the image quality of object in the scattering medium greatly.
Claims (1)
1. an intensity correlation improves the device of object imaging quality in the scattering medium, be characterised in that its formation comprises thermal light source (1), the working direction of the light beam that sends along this thermal light source (1) is provided with Amici prism (2), this Amici prism (2) is divided into transmitted light beam and folded light beam with light beam, is thing beam path alignment lens (3) successively in the transmitted light beam direction of this Amici prism (2), is in object under test (4), thing light path imaging lens (5) and thing light path surface detector (6) in the scattering medium; Folded light beam direction at described Amici prism (2) is reference path collimation lens (7) and reference path surface detector (8) successively, and the output terminal of described thing light path surface detector (6) and reference path surface detector (8) is connected to have simultaneously gathers light distribution information data and the computing machine (9) that carries out the intensity correlation computing; The test surface of described reference path surface detector (8) satisfies following relationship to the distance z at described reference path collimation lens (7) center:
Wherein: z
1For the center of thing beam path alignment lens (3) and to the distance between the object under test (4), f is the focal length of reference path collimation lens (7), f
1Focal length for thing beam path alignment lens (3); Described thermal light source (1) is synchronoused working by a synchronous generator synchronous triggering control simultaneously with thing light path surface detector (6) and reference path surface detector (8).
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