CN110200578A - Head is spied upon in all -fiber based on mechanical long-period fiber grating processed - Google Patents
Head is spied upon in all -fiber based on mechanical long-period fiber grating processed Download PDFInfo
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- CN110200578A CN110200578A CN201910418373.3A CN201910418373A CN110200578A CN 110200578 A CN110200578 A CN 110200578A CN 201910418373 A CN201910418373 A CN 201910418373A CN 110200578 A CN110200578 A CN 110200578A
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- fiber
- long
- period
- fiber grating
- steel needle
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- 239000000835 fiber Substances 0.000 title claims abstract description 68
- 239000013307 optical fiber Substances 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000003384 imaging method Methods 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001574 biopsy Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 210000001672 ovary Anatomy 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00165—Optical arrangements with light-conductive means, e.g. fibre optics
- A61B1/00167—Details of optical fibre bundles, e.g. shape or fibre distribution
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00188—Optical arrangements with focusing or zooming features
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/07—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements using light-conductive means, e.g. optical fibres
Abstract
Head is spied upon in a kind of all -fiber based on mechanical long-period fiber grating processed, including input optical fibre, machinery long-period fiber grating MLPFG processed, two pairs of front and back placement position different steel needle, non-homogeneous stress optical fiber NSF and one section of graded index fiber GIF, the machinery long-period fiber grating MLPFG is located in the fibre core of the input optical fibre, the non-homogeneous stress optical fiber NSF welding is after input optical fibre, and the graded index fiber GIF welding is after non-homogeneous stress optical fiber NSF.The present invention realizes big depth of focus and lateral resolution all -fiber based endoscopic imaging as big as possible.
Description
Technical field
The present invention relates to medical detection technologies and machinery long-period fiber grating (Mechanically induced
Long-Period Fiber Gratings, is abbreviated as MLPFG) head is spied upon in field more particularly to all -fiber.
Background technique
The major function of all -fiber probe is the light beam for conducting light source and issuing, it is focused in sample tissue, is then swept
It retouches and the reflected light for collecting sample is imaged.Since the design for spying upon head in first is suggested, there are many kinds of classes
Interior snooping head, can be divided into side view and spy upon head in snooping head and forward sight.The imaging suitable for major lumen is peeped in side view, and
The presently the most based endoscopic imaging mode of mainstream, and peeped in forward sight and be more suitable for the leading biological biopsy of image, for example, to bladder,
Ovary etc. is imaged to use often and be peeped in forward sight.
Summary of the invention
In order to overcome the shortcomings of to spy upon head in existing, the present invention proposes a kind of based on the complete of mechanical long-period fiber grating processed
Head is spied upon in optical fiber, realizes all -fiber based endoscopic imaging of big depth of focus and lateral resolution as big as possible.
The technical solution adopted by the present invention to solve the technical problems is:
Head, including input optical fibre, mechanical system long week are spied upon in a kind of all -fiber based on mechanical long-period fiber grating processed
The different steel needle in phase fiber grating MLPFG, two pairs of front and back placement position, non-homogeneous stress optical fiber (Nonuniform Stressed
Fiber is abbreviated as NSF) and one section of graded index fiber (Graded Index Fiber, be abbreviated as GIF), the mechanical system
Long-period fiber grating MLPFG is located in the fibre core of the input optical fibre, and the non-homogeneous stress optical fiber NSF welding is in input light
After fibre, the graded index fiber GIF welding is after non-homogeneous stress optical fiber NSF.
Further, previous that groove is had to steel needle, pressure is applied to form MLPFG to the input optical fibre；It is latter right
Steel needle is located at non-homogeneous stress outer fiber, applies pressure F2.
Previous is that upper and lower position is put to steel needle, and latter is that upper left bottom-right location is put to steel needle.Two pairs of front and back steel needle is flat
There is an angle, θ to select to regulate and control light field high-order mode between face, realizes the beam-expanding collimation output of light field.
Further, the light after beam-expanding collimation is focused in sample by graded index fiber, realizes big depth of focus imaging,
Guarantee lateral resolution as big as possible simultaneously, obtains sample message.
Technical concept of the invention are as follows: by being produced to one section of NSF of welding, the welding GIF after NSF after MLPFG
Head is spied upon in the controllable all -fiber of optical field distribution based on MLPFG.It is carried out using machinery long-period grating pair high-order mode
The beam-expanding collimation output of light field is realized in selection, in conjunction with graded index fiber, is finally realized big depth of focus and is properly laterally differentiated
The imaging of rate.
Beneficial effects of the present invention are mainly manifested in: 1) using machinery long-period fiber grating coupling dichroism and
The light field adjusting function of NSF realizes the beam-expanding collimation output of light field while reducing intermode interference.2) graded index fiber
Instead of the lens in conventional endoscope probe, the volume of fibre-optical probe is substantially reduced.
Detailed description of the invention
Fig. 1 is to spy upon header structure schematic diagram in all -fiber based on mechanical long-period fiber grating processed.
Fig. 2 is the schematic diagram of two pairs of steel needle placement positions.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Figures 1 and 2, head, including input light are spied upon in a kind of all -fiber based on mechanical long-period fiber grating processed
Fibre 101 and machinery long-period fiber grating MLPFG 102, non-homogeneous stress optical fiber NSF 103 and graded index fiber GIF
104, the machinery long-period fiber grating MLPFG102 is located in the fibre core of input optical fibre 101, non-homogeneous stress optical fiber
NSF103 welding is after input optical fibre 101, the welding graded index fiber after non-homogeneous stress optical fiber NSF103
GIF104.It is previous that groove is had to steel needle, it is located at 101 outside of input optical fibre, applies pressure F1, to form machinery long period
Fiber grating MLPFG102；It is latter that non-homogeneous 103 outside of stress optical fiber is located to steel needle, apply pressure F2.It is previous to be to steel needle
Upper and lower position is put, and latter is that upper left bottom-right location is put to steel needle.As shown in Fig. 2, two pairs of front and back steel needle interplanar has one
Angle, θ selects high-order mode to regulate and control light field, reduces intermode interference, realizes the beam-expanding collimation output of light field.It expands
Light after collimation is focused in sample 105 by graded index fiber, realizes big depth of focus and lateral resolution (light as big as possible
Beam is as shown at 116), obtain sample message.
Referring to Fig.1, the working process and principle of entire device are as follows: light source is selected as the continuous wide spectrum light of Low coherence
Source, the LP01 signal generated is as shown in figure 1 shown in 111, and spectrogram is as shown in figure 1 shown in 1.
LP01 signal is by MLPFG102, since the portion of energy of the coupled characteristic optical signal of MLPFG is coupled to cladding mode
In formula LP11, as shown in figure 1 shown in 112, spatial distribution is respectively 3 (in coverings), i.e. basic mode in optical fiber 2 in Fig. 1 (in fibre core)
Part is coupled as the high-order mode in covering.MLPFG is designed according to actual requirement, its strap is made to be wider than light source significant wave
It long bandwidth and makes it have satisfactory coupling efficiency and meets subsequent imaging requirements.
It is coupled to the high-order mode LP11 optical signal in covering by MLPFG102 and continues onwards transmission, when passing through NSF, steel
Fiber core refractive index can be made to change for the pressure of fibre core, the variation of fiber core refractive index is so that LP11 mode is propagated in a fiber
When form certain phase difference in two directions.Thus LP11 mode is separated into two modes, referred to as LP11a and LP11b.
By the adjusting to steel needle pressure and θ, the angle of phase difference and the transmission of two modes between adjustable LP11a and LP11b,
It realizes the beam-expanding collimation to transmission light, finally obtains light beam 113 that a cross-sectional strength is evenly distributed (by Fig. 1 114 and 115
Composition, spectrogram correspond respectively to 4 and 5).It is focused in sample 105, is realized big burnt by graded index fiber 104 later
Plutonic picture, while guaranteeing lateral resolution as big as possible, obtain sample message.
Claims (4)
1. spying upon head in a kind of all -fiber based on mechanical long-period fiber grating processed, which is characterized in that including input optical fibre, machine
The different steel needle in tool long-period fiber grating MLPFG, two pairs of front and back placement position, non-homogeneous stress optical fiber NSF and one section are gradually
Nonlinear refractive-index fiber GIF, the machinery long-period fiber grating MLPFG is located in the fibre core of the input optical fibre, described non-
Uniform stressed optical fiber NSF welding is after input optical fibre, and the graded index fiber GIF welding is in non-homogeneous stress optical fiber
After NSF.
2. spying upon head in all -fiber as described in claim 1 based on mechanical long-period fiber grating processed, which is characterized in that preceding
A pair of of steel needle has groove, applies pressure to the input optical fibre to form machinery long-period fiber grating MLPFG；It is latter
Non-homogeneous stress outer fiber is located to steel needle, applies pressure F2.
3. spying upon head in all -fiber as claimed in claim 2 based on mechanical long-period fiber grating processed, which is characterized in that preceding
A pair of of steel needle is that upper and lower position is put, and latter is that upper left bottom-right location is put to steel needle, and two pairs of front and back steel needle interplanar has one
Angle, θ selects high-order mode to regulate and control light field, realizes the beam-expanding collimation output of light field.
4. spying upon head, feature in all -fiber based on mechanical long-period fiber grating processed as described in one of claims 1 to 3
It is, the light after beam-expanding collimation is focused in sample by graded index fiber GIF, is realized big depth of focus imaging, is guaranteed simultaneously
Lateral resolution as big as possible obtains sample message.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910418373.3A CN110200578B (en) | 2019-05-20 | 2019-05-20 | All-fiber inner snoop head based on mechanical long-period fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910418373.3A CN110200578B (en) | 2019-05-20 | 2019-05-20 | All-fiber inner snoop head based on mechanical long-period fiber grating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110200578A true CN110200578A (en) | 2019-09-06 |
| CN110200578B CN110200578B (en) | 2024-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910418373.3A Active CN110200578B (en) | 2019-05-20 | 2019-05-20 | All-fiber inner snoop head based on mechanical long-period fiber grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110780386A (en) * | 2019-09-26 | 2020-02-11 | 中电科天之星激光技术（上海）有限公司 | Optical fiber laser beam combiner and manufacturing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020114568A1 (en) * | 2000-12-15 | 2002-08-22 | Judkins Robert O. | Optical fiber termination collimator and process of manufacture |
| US20180217410A1 (en) * | 2016-09-29 | 2018-08-02 | Nlight, Inc. | Fiber optical beam delivery device producing selectable intensity profiles |
| US20180217407A1 (en) * | 2016-09-29 | 2018-08-02 | Nlight, Inc. | Fiber optical beam delivery device producing output exhibiting intensity distribution profile having non-zero ellipticity |
| CN108873177A (en) * | 2018-06-20 | 2018-11-23 | 浙江工业大学 | Reflective machinery band-pass filter for long-period fiber gratings |
| CN108988112A (en) * | 2018-08-29 | 2018-12-11 | 西北工业大学 | A kind of vector or vortex field fiber laser |
| CN210871463U (en) * | 2019-05-20 | 2020-06-30 | 浙江工业大学 | All-fiber endoscopic probe based on mechanical long-period fiber grating |
-
2019
- 2019-05-20 CN CN201910418373.3A patent/CN110200578B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020114568A1 (en) * | 2000-12-15 | 2002-08-22 | Judkins Robert O. | Optical fiber termination collimator and process of manufacture |
| US20180217410A1 (en) * | 2016-09-29 | 2018-08-02 | Nlight, Inc. | Fiber optical beam delivery device producing selectable intensity profiles |
| US20180217407A1 (en) * | 2016-09-29 | 2018-08-02 | Nlight, Inc. | Fiber optical beam delivery device producing output exhibiting intensity distribution profile having non-zero ellipticity |
| CN108873177A (en) * | 2018-06-20 | 2018-11-23 | 浙江工业大学 | Reflective machinery band-pass filter for long-period fiber gratings |
| CN108988112A (en) * | 2018-08-29 | 2018-12-11 | 西北工业大学 | A kind of vector or vortex field fiber laser |
| CN210871463U (en) * | 2019-05-20 | 2020-06-30 | 浙江工业大学 | All-fiber endoscopic probe based on mechanical long-period fiber grating |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110780386A (en) * | 2019-09-26 | 2020-02-11 | 中电科天之星激光技术（上海）有限公司 | Optical fiber laser beam combiner and manufacturing method thereof |
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| Publication number | Publication date |
|---|---|
| CN110200578B (en) | 2024-05-07 |
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