CN211505205U - Reflection type near-infrared optical fiber probe - Google Patents
Reflection type near-infrared optical fiber probe Download PDFInfo
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- CN211505205U CN211505205U CN201921776049.0U CN201921776049U CN211505205U CN 211505205 U CN211505205 U CN 211505205U CN 201921776049 U CN201921776049 U CN 201921776049U CN 211505205 U CN211505205 U CN 211505205U
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Abstract
The utility model discloses a reflection-type near-infrared optical fiber probe, which comprises a self-focusing lens, 13 incident optical fibers, an incident optical fiber jumper wire, a first optical fiber protective sleeve, a third optical fiber protective sleeve, 6 emergent optical fibers and an emergent optical fiber jumper wire; the emergent optical fiber and the front section of the incident optical fiber are combined together in a fixed arrangement mode, and the end face of the top end is fixedly connected with the self-focusing lens; the merging part is wrapped by a first optical fiber protective sleeve; the rear sections of the 6 emergent optical fibers are combined together and wrapped by a third optical fiber protective sleeve, and the tail end of the third optical fiber protective sleeve is connected with an emergent optical fiber jumper; the rear sections of the 13 incident optical fibers are combined together and wrapped by a second optical fiber protective sleeve, and the tail end of the second optical fiber protective sleeve is connected with an incident optical fiber jumper. The utility model provides high signal collection efficiency, spectral strength and measurement accuracy of probe.
Description
Technical Field
The utility model belongs to the field of biomedical photonics, especially, relate to a reflective near-infrared fiber probe.
Background
With the continuous development of near-infrared spectrometers and chemometrics software, the near-infrared analysis technology has become one of the most widely used and most potential rapid material analysis methods. The optical fiber has the characteristics of flexible light guide, thermal stability, insensitivity to electromagnetic interference, concentrated energy of transmitted signals, low price and the like. The near-infrared probe based on the optical fiber structure is simple in structure and flexible to use, is an effective supplementary accessory of a spectrometer, and is favored by various industries.
Based on the optical principle of diffuse reflection, the near-infrared fiber-optic probe can be used for measuring various types of solid samples, such as thicker and opaque samples, and also can detect opaque samples in turbid industrial environments or biological tissues in medical environments so as to diagnose abnormalities or diseases. The near-infrared probe mostly adopts a fiber bundle, such as an n + m fiber bundle, n fibers transmit light emitted by a light source or a monochromator and irradiate the light on a sample to be detected, and m fibers collect diffuse reflected light carrying sample information and transmit the diffuse reflected light to a spectrometer (chemometrics method and molecular spectroscopy technology, paperwork, chemical industry press, first edition, 283). In the process of diffuse reflection, near-infrared light transmitted by a light source through an incident optical fiber interacts with the surface or the inside of a sample, the light propagation direction is changed constantly, and finally emergent light carrying sample information is collected and led out by an emergent optical fiber to finally obtain a diffuse reflection spectrum (chemometrics method and molecular spectrum analysis technology, paperwork, chemical industry press, first edition, 281 and 282).
The optical fiber probe accessory comprises a light incidence end, a light emergent end, a detection end and the like. The method not only saves cost, has strong anti-interference capability and effectively collects diffuse reflection light, but also eliminates the influence of factors such as light source power fluctuation, zero drift and the like on the measurement precision in the range as far as possible (Zhushanying, CaoCone-sensitive, reflective optical fiber beam probe theoretical modeling and simulation realize [ J ] instrument technology and sensor, 2013(5): 75-78.). Because the signal-to-noise ratio, the light intensity and the light energy utilization rate of the existing near-infrared optical fiber probe are still relatively low, the diffuse reflection light signal detected by the emergent optical fiber is weak, and the subsequent spectral analysis is not facilitated.
The self-focusing lens is also called gradient refractive index lens, is a cylindrical optical lens with refractive index distribution gradually changed along the radial direction, has imaging and focusing functions, and can be conveniently used in various micro optical systems due to the characteristics of end surface collimation, coupling and imaging and the cylindrical small appearance. And is widely used in the field of integrated optics, such as micro optical systems, medical optical instruments, optical copiers, facsimile machines, scanners, and the like. The self-focusing lens can focus and collimate the diffuse reflection light on the irradiated sample, and reduce the loss of energy in the optical fiber transmission process. Therefore, the diffuse reflection measurement can be carried out by adopting the method of coupling the optical fiber arrangement and the self-focusing lens with the optical fiber bundle, the sample information can be collected more efficiently, and the method has great application prospect in the field of biomedicine.
The utility model has the following contents:
utility model purpose: for solving the lower scheduling problem of current infrared fiber probe SNR, light intensity and light energy utilization ratio, the utility model provides a reflective near-infrared fiber probe.
The technical scheme is as follows: the utility model provides a reflection-type near-infrared optical fiber probe, which comprises a handle sleeve, a self-focusing lens, 13 incident optical fibers, an incident optical fiber jumper wire, a first optical fiber protective sleeve, a second optical fiber protective sleeve, a third optical fiber protective sleeve, 6 emergent optical fibers and an emergent optical fiber jumper wire; the diameters of the incident optical fiber and the emergent optical fiber are the same;
the emergent optical fiber and the front section of the incident optical fiber are combined together in a fixed arrangement mode, are wrapped by a first optical fiber protective sleeve, and the top end of the emergent optical fiber and the front section of the incident optical fiber are coupled with a self-focusing lens; the fixed arrangement is: after being combined together, the end faces of the top ends of the outgoing optical fibers and the incident optical fibers form a regular hexagon, namely the outgoing optical fibers and the incident optical fibers form a hexagon, six side faces of the hexagon are composed of first to third outgoing optical fibers and first to ninth incident optical fibers, and each face comprises one outgoing optical fiber and two incident optical fibers; determining a regular triangle according to the circle centers of the end faces of the top ends of the first to third outgoing optical fibers, wherein the fourth to sixth outgoing optical fibers are respectively distributed on the middle points of three sides of the regular triangle, and the circle centers of the end faces of the top ends of the fourth to sixth outgoing optical fibers respectively correspond to the middle points of the sides where the fourth to sixth outgoing optical fibers are located; the tenth incident optical fiber is arranged in the middle area of the regular triangle, the circle center of the end face at the top end of the tenth incident optical fiber corresponds to the center of the regular triangle, the eleventh to thirteenth incident optical fibers are distributed around the tenth incident optical fiber at equal intervals, and the circle centers of the end faces at the top ends of any two incident optical fibers in the eleventh to thirteenth incident optical fibers are connected with the center of the regular triangle to form an included angle of 120 degrees;
the exit optical fibers are separated from the rear sections of the incident optical fibers, the rear sections of the 6 exit optical fibers are combined together and wrapped by a third optical fiber protective sleeve, and the tail ends of the exit optical fibers are connected with an exit optical fiber jumper; the rear sections of the 13 incident optical fibers are combined together and wrapped by a second optical fiber protective sleeve, and the tail end of the second optical fiber protective sleeve is connected with an incident optical fiber jumper.
Furthermore, the rear sections of the 6 outgoing optical fibers are combined to form a circle, and two adjacent outgoing optical fibers are in contact with each other.
Furthermore, the rear sections of the 13 incident optical fibers are combined together to comprise three layers, wherein the first layer comprises one incident optical fiber; the second layer comprises 6 incident optical fibers, and the 6 incident optical fibers are centered on the incident optical fibers of the first layer and wrapped around the incident optical fibers of the first layer; the third layer comprises 6 incident optical fibers, the 6 incident optical fibers are distributed around the second layer at equal intervals, and the circle center of the end face of the tail end of each incident optical fiber of the third layer and the circle centers of the end faces of the tail ends of two incident optical fibers of the second layer adjacent to the end face of the tail end of each incident optical fiber of the third layer form a regular triangle.
Further, the self-focusing lens is a self-focusing collimating lens.
Further, the probe also comprises a fourth protective sleeve, and the fourth protective sleeve is wrapped on the self-focusing lens.
Furthermore, the fourth protective sheath and the first protective sheath are made of stainless steel materials and are connected with each other through welding.
Furthermore, the probe also comprises a beam splitting protective sleeve, and the beam splitting protective sleeve is arranged in a transition region where the emergent optical fiber and the incident optical fiber are separated and combined.
Further, the probe also comprises a handle sleeve which is nested on the first optical fiber protective sleeve.
Furthermore, the handle sleeve is made of stainless steel materials.
Has the advantages that: the utility model discloses what implement arranges optic fibre in the probe optimizes, and has adopted the self-focusing lens to can be under the condition of less probe diameter, the improvement signal collection efficiency, spectral strength and the measurement accuracy of furthest, and acquire more excellent near infrared spectrum.
Drawings
Fig. 1 is an overall configuration diagram of the present embodiment;
fig. 2 shows (a) schematic end-face diagrams of the exit fibers and the tips of the entrance fibers, (b) schematic end-face arrangement of the ends of 6 exit fibers, and (c) schematic end-face arrangement of the ends of 13 entrance fibers.
Reference numerals: 1. an incident optical fiber; 2. an outgoing optical fiber; 3. a handle cover; 4. a first optical fiber protective jacket; 5. a beam splitting position protective sleeve; 6. a second fiber protective jacket; 7. a third fiber protective jacket; 8. an incident optical fiber jumper; 9. emitting an optical fiber jumper; 10. a self-focusing lens.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment provides a reflective near-infrared fiber probe, as shown in fig. 1: the probe comprises an incident optical fiber 1, an emergent optical fiber 2, a handle sleeve 3, a first optical fiber protective sleeve 4, a beam splitting position protective sleeve 5, a second optical fiber protective sleeve 6, a third optical fiber protective sleeve 7, an incident optical fiber jumper wire 8, an emergent optical fiber jumper wire 9 and a self-focusing lens 10; the incident optical fiber 1 is connected with the coupling head through an incident optical fiber jumper wire 8, and the emergent optical fiber 2 is connected with the coupling head through an emergent optical fiber jumper wire 9. In this embodiment, there are 13 incident optical fibers and 6 exit optical fibers, and the diameters of the incident optical fibers and the exit optical fibers are the same.
The front sections of the 6 outgoing optical fibers and the 13 incoming optical fibers are combined together in a fixed arrangement mode, and the first optical fiber protective sleeve comprises the fixed arrangement, as shown in fig. 2(a), specifically: after being combined together, the end faces of the top ends of the outgoing optical fibers and the incident optical fibers form a regular hexagon, namely the outgoing optical fibers and the incident optical fibers form a hexagon, six side faces of the hexagon are composed of first to third outgoing optical fibers and first to ninth incident optical fibers, and each face comprises one outgoing optical fiber and two incident optical fibers; determining a regular triangle according to the circle centers of the end faces of the top ends of the first to third emergent optical fibers, wherein the fourth to sixth emergent optical fibers are respectively distributed on the middle points of three sides of the regular triangle, and the circle centers of the end faces of the top ends are respectively corresponding to the middle points of the sides where the fourth to sixth emergent optical fibers are located; the tenth incident optical fiber is arranged in the middle area of the regular triangle, the circle center of the end face at the top end of the tenth incident optical fiber corresponds to the center of the regular triangle, the eleventh to thirteenth incident optical fibers are distributed around the tenth incident optical fiber at equal intervals, and the circle centers of the end faces at the top ends of any two incident optical fibers in the eleventh to thirteenth incident optical fibers are connected with the center of the regular triangle to form an included angle of 120 degrees.
After the front sections of the 6 outgoing optical fibers and the 13 incoming optical fibers are combined together in a fixed arrangement mode, the top end of each outgoing optical fiber and the front section of each incoming optical fiber are coupled with a self-focusing lens, and therefore the detection end of the reflection type near-infrared optical fiber probe is formed; the self-focusing lens is adopted, so that more diffuse reflection light can be converged on the probe, the light transmission direction is parallel to the optical fiber as far as possible, and the loss in the transmission process of the emergent optical fiber is reduced; in this embodiment, the self-focusing lens is a self-focusing collimating lens.
The emergent optical fibers are separated from the rear sections of the incident optical fibers, the rear sections of the 6 emergent optical fibers are combined together, the combined tail end faces are arranged as shown in figure 2(b), the combined tail end faces are wrapped by a third optical fiber protective sleeve 7, and the tail ends are connected with emergent optical fiber jumpers; the rear sections of the 13 incoming optical fibers are merged together, the merged end faces are arranged as shown in fig. 2(c), and are wrapped by a second optical fiber protective sleeve 6, and the ends are connected with incoming optical fiber jumpers.
This embodiment further includes a fourth protective cover, which is wrapped around the self-focusing lens. The damage of the self-focusing lens is prevented, and the diameter of the probe is smaller; and the fourth protective sheath adopts stainless steel material, has reduced the light source loss of detection end. The first protective sleeve is made of stainless steel materials, and the fourth protective sleeve is connected with the first protective sleeve through welding, so that the loss of an incident light source is further reduced.
The handle sleeve is nested on the first protective sleeve; the handle sleeve in the embodiment is made of stainless steel materials, and the length of the handle sleeve is 10 cm.
The beam splitting protection sleeve is arranged in a transition region where the emergent optical fiber and the incident optical fiber are separated and combined.
The key of the embodiment lies in the optimization of the arrangement of the optical fibers in the probe and the selection of the self-focusing lens at the front end of the optical fiber bundle, and aims to improve the signal collection efficiency, the spectrum intensity and the measurement precision to a greater extent and obtain a better near infrared spectrum under the condition of obtaining a smaller probe diameter. For verifying the utility model discloses whether reach the effect, the utility model discloses a Tracepro optical software establishes 6 reflective near-infrared probe's model respectively and carries out the light pursuit. In order to facilitate the establishment of the model, the model is simplified under the condition of ensuring important parameters: assuming that the selected fiber core material is SiO with low OH bonds2(ii) a The refractive index of the fiber cladding is 1.39; the grating point light source with the incident wavelength of 1550nm is coupled into the incident optical fiber through the lens, the number of traced light rays is about 38 ten thousand, the light source is vertically incident into the optical fiber, the total incident light power of each incident optical fiber is 1W, the sample is set to be a diffuse reflection white board with the refractive index of 1.5, and each of different modelsThe parameter value settings are all the same.
The illumination data values of all points of the emergent surface can be obtained by adopting Tracepro optical software to perform tracking simulation on light rays. The simulation results are shown in table 1:
TABLE 1
In table 1, (a) and (b) the fiber distributions are respectively fiber arrangements at the common end of the probe designed by high-class people, the fiber core diameters are respectively 0.2mm and 0.3mm (high-class, korean light, luqinpeng, near infrared light propagation in skin tissue and fiber detection structure design [ J ]. photonics newspaper, 2017,47 (1)), (c) the fiber distributions adopted by the probe of the present invention are not coupled with the simulation result of the self-focusing lens (a1-c1 is the simulation result of the corresponding distribution coupling self-focusing lens). As can be seen from Table 1: (c) compared with the optical fiber adopted in the step (a) or the step (b), the cost can be saved; through the normalized energy comparison of the emergent ends of the emergent optical fibers (a) and (b), the following results are found: the larger the diameter of the optical fiber is, the stronger the signal collection effect is, but the diameter of the probe is increased at the same time, so that the measurement accuracy is influenced; comparing the normalized energy of the emergent end of the emergent optical fiber in (b) and (c) to find out: (c) about 1.8 times of (b), which shows that the larger the number of outgoing fibers, the stronger the signal collection effect. By comparing (a) and (a1), (b) and (b1), (c) and (c 1): after the self-focusing lens is added in front of the probe, the normalized energy of the emergent end of the emergent optical fiber is greatly increased, wherein the collected energy of c1 is the highest, and compared with the result of c, the enhancement effect is as high as 50 times. To sum up, this design light intensity coupling efficiency is high, can make the probe gather more efficiently and come from sample information, and measurement performance and effect are better.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (9)
1. A reflection type near-infrared optical fiber probe is characterized by comprising a self-focusing lens, 13 incident optical fibers, an incident optical fiber jumper, first to third optical fiber protective sleeves, 6 emergent optical fibers and an emergent optical fiber jumper; the diameters of the incident optical fiber and the emergent optical fiber are the same;
the emergent optical fiber and the front section of the incident optical fiber are combined together in a fixed arrangement mode, are wrapped by a first optical fiber protective sleeve, and the top end of the emergent optical fiber and the front section of the incident optical fiber are coupled with a self-focusing lens; the fixed arrangement is: after being combined together, the end faces of the top ends of the outgoing optical fibers and the incident optical fibers form a regular hexagon, namely the outgoing optical fibers and the incident optical fibers form a hexagon, six side faces of the hexagon are composed of first to third outgoing optical fibers and first to ninth incident optical fibers, and each face comprises one outgoing optical fiber and two incident optical fibers; determining a regular triangle according to the circle centers of the end faces of the top ends of the first to third outgoing optical fibers, wherein the fourth to sixth outgoing optical fibers are respectively distributed on the middle points of three sides of the regular triangle, and the circle centers of the end faces of the top ends of the fourth to sixth outgoing optical fibers respectively correspond to the middle points of the sides where the fourth to sixth outgoing optical fibers are located; the tenth incident optical fiber is arranged in the middle area of the regular triangle, the circle center of the end face at the top end of the tenth incident optical fiber corresponds to the center of the regular triangle, the eleventh to thirteenth incident optical fibers are distributed around the tenth incident optical fiber at equal intervals, and the circle centers of the end faces at the top ends of any two incident optical fibers in the eleventh to thirteenth incident optical fibers are connected with the center of the regular triangle to form an included angle of 120 degrees;
the exit optical fibers are separated from the rear sections of the incident optical fibers, the rear sections of the 6 exit optical fibers are combined together and wrapped by a third optical fiber protective sleeve, and the tail ends of the exit optical fibers are connected with an exit optical fiber jumper; the rear sections of the 13 incident optical fibers are combined together and wrapped by a second optical fiber protective sleeve, and the tail end of the second optical fiber protective sleeve is connected with an incident optical fiber jumper.
2. A reflective near-infrared fiber optic probe according to claim 1, wherein the rear sections of the 6 outgoing fibers are combined to form a circle, and two adjacent outgoing fibers are in contact with each other.
3. A reflective near-infrared fiber optic probe according to claim 1, wherein the rear section of the 13 incident optical fibers, when combined, comprises three layers, a first layer comprising one incident optical fiber; the second layer comprises 6 incident optical fibers, and the 6 incident optical fibers are centered on the incident optical fibers of the first layer and wrapped around the incident optical fibers of the first layer; the third layer comprises 6 incident optical fibers, the 6 incident optical fibers are distributed around the second layer at equal intervals, and the circle center of the end face of the tail end of each incident optical fiber of the third layer and the circle centers of the end faces of the tail ends of two incident optical fibers of the second layer adjacent to the end face of the tail end of each incident optical fiber of the third layer form a regular triangle.
4. A reflective near-infrared fiber optic probe according to claim 1, wherein said self-focusing lens is a self-focusing collimating lens.
5. A reflective near-infrared fiber optic probe according to claim 1, further comprising a fourth protective jacket wrapped over the self-focusing lens.
6. A reflective NIR fiber optic probe according to claim 5, wherein the fourth protective sheath and the first protective sheath are made of stainless steel and are welded to each other.
7. The reflective nir fiber-optic probe of claim 1, further comprising a splitter protection jacket disposed at the transition region where the exit fiber and the entrance fiber are separated and merged.
8. A reflective near-infrared fiber optic probe according to claim 1, further comprising a handle sleeve nested over the first protective fiber optic sheath.
9. The reflective nir fiber-optic probe of claim 8, wherein the handle cover is made of stainless steel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485202A (en) * | 2020-10-19 | 2021-03-12 | 武汉优科瑞特信息技术有限公司 | Spectrometer for evaluating internal quality of fruit and attenuation slope calculation method |
| WO2023230071A1 (en) * | 2022-05-23 | 2023-11-30 | Nearwave Corp. | Near infrared spectroscopy device control and operation |
| WO2024078433A1 (en) * | 2022-10-11 | 2024-04-18 | 杭州众硅电子科技有限公司 | Online monitoring apparatus for chemical-mechanical polishing |
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2019
- 2019-10-22 CN CN201921776049.0U patent/CN211505205U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485202A (en) * | 2020-10-19 | 2021-03-12 | 武汉优科瑞特信息技术有限公司 | Spectrometer for evaluating internal quality of fruit and attenuation slope calculation method |
| WO2023230071A1 (en) * | 2022-05-23 | 2023-11-30 | Nearwave Corp. | Near infrared spectroscopy device control and operation |
| WO2024078433A1 (en) * | 2022-10-11 | 2024-04-18 | 杭州众硅电子科技有限公司 | Online monitoring apparatus for chemical-mechanical polishing |
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