CN111897048B - A long-distance transmission imaging optical fiber device - Google Patents
A long-distance transmission imaging optical fiber device Download PDFInfo
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- CN111897048B CN111897048B CN202010694895.9A CN202010694895A CN111897048B CN 111897048 B CN111897048 B CN 111897048B CN 202010694895 A CN202010694895 A CN 202010694895A CN 111897048 B CN111897048 B CN 111897048B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 77
- 230000005540 biological transmission Effects 0.000 title claims abstract description 50
- 238000003384 imaging method Methods 0.000 title claims abstract description 35
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 238000004806 packaging method and process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000010287 polarization Effects 0.000 claims abstract description 8
- 230000007797 corrosion Effects 0.000 claims abstract description 6
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims abstract description 4
- 230000008447 perception Effects 0.000 claims abstract description 3
- 230000005284 excitation Effects 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000010453 quartz Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000002121 nanofiber Substances 0.000 description 3
- 230000010365 information processing Effects 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
- G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
Abstract
The invention discloses a long-distance transmission imaging optical fiber device, which comprises: the sensing array module, the transmission optical fiber and the receiving array module; the sensing array module comprises a fiber bundle formed by a plurality of micro-nano optical fibers and a packaging module, wherein the packaging module packages the fiber bundle formed by the plurality of micro-nano optical fibers; the two ends of the transmission optical fiber are respectively connected with the sensing array module and the receiving array module in a one-to-one correspondence manner; the receiving array module is used for receiving and processing the light field information perceived by the perception array module and transmitted by the transmission optical fiber; the transmission optical fiber adopts a single-mode optical fiber, a multimode optical fiber or a polarization maintaining optical fiber, one end of the transmission optical fiber forms a fiber bundle composed of the micro-nano optical fibers through a corrosion process or a tapering technology, and the space between the adjacent micro-nano optical fibers determines the spatial resolution of the sensing array module. The invention can realize optical fiber imaging through the common quartz optical fiber, has lower cost, can realize high resolution and has simple manufacturing method.
Description
Technical Field
The invention relates to the field of optical fiber imaging, in particular to a long-distance transmission imaging optical fiber device.
Background
In recent years, how to realize imaging over long distances has become a research direction, wherein single-fiber imaging has become a big hotspot due to various advantages of the optical fiber itself. The single-fiber imaging technology can utilize a single fiber to transmit and acquire a light field containing two-dimensional or three-dimensional image information, including information such as intensity distribution, phase distribution, wave front of a light beam and the like, has made great progress in imaging mechanism, imaging quality, application research and the like in recent years, and has important application in various aspects such as medical detection, marine survey and the like because the fiber can pass through a tube or be immersed in liquid, overcomes the defects of the traditional photoelectric device and is suitable for the imaging of the human body.
However, the current common single-fiber imaging system needs to purchase a large number of imaging fibers (or called RGB fibers), the transmission wavelength range is between visible light and near infrared, the optical fibers have medium and high Numerical Aperture (NA), the diameter of the optical fibers is very thin, the structure is that a plurality of optical fiber monofilaments with a certain length are gathered into a bundle, the monofilaments at two ends are arranged in a one-to-one correspondence manner at high density, and the monofilaments are solidified and ground to form an image transmission bundle. The image projected at one end of the image transmission beam is divided into different pixels by each monofilament in the image transmission beam, and the pixels are respectively transmitted to the other end face for collecting and imaging, so that the cost of the imaging optical fiber on the market is higher at present, and the cost of the optical fiber imaging system (particularly the image with hyperspectral information transmitted in a long distance) is increased.
Accordingly, there is a need for an imaging fiber optic device that can achieve higher spatial resolution and that does not require the purchase or customization of expensive long-distance special imaging fibers, and that can be integrated into a variety of imaging systems and related applications.
Disclosure of Invention
Based on this, the present invention provides a long-distance transmission imaging optical fiber device.
The invention provides a long distance transmission imaging optical fiber device, comprising: the sensing array module, the transmission optical fiber and the receiving array module; the sensing array module comprises a fiber bundle formed by a plurality of micro-nano optical fibers and a packaging module, wherein the packaging module packages the fiber bundle formed by the plurality of micro-nano optical fibers; the two ends of the transmission optical fiber are respectively connected with the sensing array module and the receiving array module in a one-to-one correspondence manner; the receiving array module is used for receiving and processing the light field information perceived by the perception array module and transmitted by the transmission optical fiber; the transmission optical fiber adopts a single-mode optical fiber, a multimode optical fiber or a polarization maintaining optical fiber, one end of the transmission optical fiber forms a fiber bundle composed of the micro-nano optical fibers through a corrosion process or a tapering technology, and the space between the adjacent micro-nano optical fibers determines the spatial resolution of the sensing array module.
In an alternative embodiment, the plurality of transmission fibers may be protected by a bundle jacket, which may be composed of a corrosion resistant polymeric material such as polyvinyl chloride.
In an alternative embodiment, the receiving array module may be composed of a plurality of photoelectric sensors, CCD sensors, spectrometers, hyperspectral imagers, and other optical information processing devices.
In an alternative embodiment, the device further comprises an excitation light module, wherein the excitation light module can be formed by the transmission optical fiber, and an external light source can also be used.
In an alternative embodiment, the external light source may be a visible light band light source.
In an alternative embodiment, when the sensing array module is at a distance from the surface to be imaged, image speckle is formed at the receiving array module due to light field scattering, and the image speckle can be regarded as the result of convolution of the object surface light field with the transmission fiber point spread function.
In an alternative embodiment, image speckle may enable image restoration by two methods: firstly, carrying out speckle capturing on known object plane image signals for each known distance, and deconvoluting object plane images through speckles to obtain the change relation of a transmission optical fiber point spread function along with object distances, so as to realize deconvolution reduction of speckles under different object distances for different object plane images. The acquisition mode of the point spread function can also be established under a large amount of repeated calibration data, and the accurate measurement of the point spread function can be realized by combining with artificial intelligent means such as machine learning. In a second method, for each known distance, the image speckle can be regarded as the sum of speckles formed at the image plane at each point on the object plane, and the speckles formed at each point have correlation with the positions of different points on the object plane. And carrying out autocorrelation operation on the speckle, namely retaining the original image information, eliminating the influence of a point spread function, and further restoring the original image.
In an alternative embodiment, a laser ranging module is also included. For object planes of unknown positions, the ranging module can achieve measurement of corresponding distances. The distance of the object plane to the sensing array can be used for the reduction analysis of the speckle image.
Compared with the prior art, the long-distance transmission imaging optical fiber device provided by the invention can realize long-distance optical fiber imaging through the common quartz optical fiber, does not need a large amount of high-price imaging optical fibers, has low cost, can improve resolution by controlling the diameter of the micro-nano optical fibers, has a simple manufacturing method, can be integrated into various imaging systems and related applications, and can be used in various fields such as ocean, medicine and the like.
Drawings
FIG. 1 is a schematic diagram of a long-haul imaging fiber optic device according to an embodiment of the present invention;
FIG. 2 is a front view of a long-haul imaging fiber optic device sensing array module according to one embodiment of the present invention;
in the figure, a sample surface 1, a laser ranging module 2, a sensing array module 3, a transmission optical fiber 4, a receiving array module 5, an excitation optical module 6, a fiber bundle 7 and a packaging module 8.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "connected" or "connected" to another element, it can be directly connected or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1 and 2, 1 is a sample surface, 2 is a laser ranging module, 3 is a sensing array module, 4 is a plurality of transmission optical fibers, 5 is a receiving array module, 6 is an excitation light module, 7 is a fiber bundle formed by a plurality of micro-nano optical fibers, and 8 is a packaging module.
A long haul imaging fiber optic apparatus comprising: a sensing array module 3 with a surface protection coating, a plurality of transmission optical fibers 4 and a receiving array module 5; the sensing array module 3 comprises a fiber bundle 7 formed by a plurality of micro-nano optical fibers and an external packaging module 8; the two ends of the transmission optical fiber 4 are respectively connected with the sensing array module 3 and the receiving array module 5; the receiving array module 5 is configured to receive the light field information transmitted by the transmission optical fiber 4. The transmission fiber may be a common single-mode fiber, a multimode fiber or a polarization maintaining fiber, one end of which is etched or tapered to form a fiber bundle 7 formed by the micro-nano fibers (the space between the adjacent micro-nano fibers determines the spatial resolution of the sensing array module), in this embodiment, if the polarization maintaining fiber is selected, the polarization maintaining fiber is processed by adopting the tapered technology to form a uniform micro-nano fiber with an outer diameter of 20 micrometers, the polarization state of the light can be converted into an image of each individual fiber on the spatial shape, and the real-time monitoring of the polarization state of the light of each fiber can realize a high-resolution image. The packaging module 8 is used for packaging the fiber bundle 7 formed by the micro-nano optical fibers, the transmission optical fibers 4 can be protected by using a tube bundle protective sleeve and are connected with the receiving array module 5 in a one-to-one correspondence manner (the relative spatial positions of the transmission optical fibers can be changed by environmental influence in a long-distance transmission path, but the one-to-one correspondence relationship between the transmission optical fibers at the beginning and the end is not influenced), and the receiving array module 5 can receive and process the light field information from the sensing array module 3.
In an alternative embodiment, the plurality of transmission fibers 4 may be protected by a bundle jacket, which may be composed of a corrosion resistant polymeric material such as polyvinyl chloride.
In an alternative embodiment, the receiving array module 5 employs a plurality of optical information processing devices such as photoelectric sensors, CCD sensors, spectrometers, hyperspectral imagers, and the like. In this embodiment, a hyperspectral imager is used to obtain hyperspectral information of the target, and at the same time, image restoration can be realized at a certain wavelength, so as to realize hyperspectral detection of the object plane.
In an alternative embodiment, the device further comprises an excitation light module 6, wherein the excitation light module 6 can be formed by the transmission optical fiber, and an external light source can also be used. In this embodiment, the excitation light module is composed of an external light source, and the external light source is a laser diode module with a working wavelength of 650-670 nm.
In an alternative embodiment, the sensing array module 3 may be spaced from the surface to be imaged, which greatly expands the working distance of the device compared with the condition that the sensing module of the conventional device must be closely attached to the sample to be tested, and is beneficial to the application of partial non-contact detection in the requirement occasion. The receiving array module 5 realizes the restoration of the speckle to the original image after the operation such as deconvolution and autocorrelation of the captured speckle signal.
In this embodiment, the sensing array module 3 is located underwater, the receiving array module 5 is located on the ground, and the device can be used for remotely measuring biological information underwater. When the sensing array module 3 works, the fiber bundle 7 formed by the micro-nano optical fibers has small radius, so that the distance between the adjacent micro-nano optical fibers is small, and the higher spatial resolution of the sensing array module 3 is ensured, namely, each optical fiber forms a final pixel image like a discrete pixel point and is transmitted to the receiving array module 5 through the transmission optical fiber 4, and even if the bundle protective sleeve is damaged, the transmission optical fibers 4 become loose light bundles, and the acquisition and the processing of light field information are not influenced.
In this embodiment, the excitation light module 6 emits light to illuminate the sample surface (object surface) 1 to be measured. The sensing array module 3 is kept at a distance from the sample 1, which is measured by the laser ranging module 2 and denoted as d. The optical field distribution of the sample 1 is denoted as O (d), while the point spread function of the transmission fiber 4 is denoted as PSF (d), and for each different distance d, the speckle signal acquired by the receive array module 5 is denoted as I (d). There is the following correspondence:
I(d) = O(d) x PSF(d)，
for any distance d, the standard I (d) corresponding to the standard sample O (d) under different d is correspondingly measured in advance, so that the PSF (d) corresponding to the any distance d is calibrated. And then, for the measurement of any sample, only the corresponding I (d) is measured, and deconvolution operation is carried out by combining with the PSF (d), so that the light field distribution O (d) of any sample can be restored. By the deconvolution method, original image restoration of the speckle image at a certain distance can be realized.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. The protection scope of the present invention shall be subject to the appended claims.
Claims (6)
1. A long haul imaging fiber optic apparatus comprising: the sensing array module, the transmission optical fiber and the receiving array module; the sensing array module comprises a fiber bundle formed by a plurality of micro-nano optical fibers and a packaging module, wherein the packaging module packages the fiber bundle formed by the plurality of micro-nano optical fibers; the two ends of the transmission optical fiber are respectively connected with the sensing array module and the receiving array module in a one-to-one correspondence manner; the receiving array module is used for receiving and processing the light field information perceived by the perception array module and transmitted by the transmission optical fiber; the transmission optical fiber adopts a single-mode optical fiber, a multimode optical fiber or a polarization maintaining optical fiber, one end of the transmission optical fiber forms a fiber bundle composed of the micro-nano optical fibers through a corrosion process or a tapering technology, and the space between the adjacent micro-nano optical fibers determines the spatial resolution of the sensing array module;
when the sensing array module is at a certain distance from the surface to be imaged, image speckles are formed at the receiving array module due to light field scattering;
The image speckle realizes image restoration by the following method: carrying out speckle capturing on the known object plane image signals at each known distance, and deconvoluting the object plane images through speckles to obtain the change relation of a transmission optical fiber point spread function along with the object distances, so as to realize deconvolution reduction of speckles under different object distances for different object plane images;
The image speckle realizes image restoration by the following method: for each known distance, the image speckle is regarded as the sum of speckles formed by each point on the object plane on the image plane, the speckles formed by each point have correlation along with the positions of different points on the object plane, and the speckles are subjected to autocorrelation operation, so that the original image information can be kept, the influence of a point spread function is eliminated, and the original image is restored.
2. The long haul imaging fiber optic apparatus of claim 1, wherein said transmission fibers are protected using a bundle jacket, said bundle jacket being of a corrosion resistant polymeric material.
3. The long haul imaging fiber optic device of claim 1, wherein said receive array module employs a photosensor, a CCD sensor, a spectrometer, or a hyperspectral imager.
4. The long-haul imaging fiber optic apparatus of claim 1, further comprising an excitation light module, wherein transmission of the excitation light module may be comprised of the transmission fiber or an external light source may be used.
5. The long haul imaging fiber optic device of claim 4, wherein said external light source is a visible light band light source.
6. The long-distance transmission imaging optical fiber device according to claim 1, wherein a laser ranging module is installed in front of the sensing array module, so that distance measurement of an object plane at an unknown position is realized, and an accurate distance basis is provided for speckle image restoration.
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