CN117030197A - Portable focal ratio measuring device - Google Patents
Portable focal ratio measuring device Download PDFInfo
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- CN117030197A CN117030197A CN202310993352.0A CN202310993352A CN117030197A CN 117030197 A CN117030197 A CN 117030197A CN 202310993352 A CN202310993352 A CN 202310993352A CN 117030197 A CN117030197 A CN 117030197A
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- optical fiber
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- focal ratio
- focal
- diaphragm
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- 239000013307 optical fiber Substances 0.000 claims abstract description 105
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 238000003384 imaging method Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims description 23
- 238000012360 testing method Methods 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 14
- 238000000691 measurement method Methods 0.000 abstract 1
- 239000000571 coke Substances 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
Classifications
-
- 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
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
Abstract
The invention discloses a portable focal ratio measuring device, which relates to the technical field of focal ratio measurement and comprises a light source, a first diaphragm, a second diaphragm, a first lens, a second lens, an optical sleeve, a system to be measured protecting shell, a CCD imaging target surface, a display, a central control system, a keyboard, an optical fiber to be measured and an optical fiber connector; the light source, the first diaphragm, the second diaphragm, the first lens and the second lens are integrally fixed in the optical sleeve, the light source is arranged at the focal position of the first lens, parallel light is arranged between the first lens and the second lens, the first diaphragm shields stray light, the second diaphragm is used for determining the diameter of a light spot incident on the second lens and is marked as D, and the focal length of the second lens is marked as F. The integrated optical circuit simplifies the measurement method, realizes high-efficiency portable focal ratio measurement, and is not limited to laboratory environment.
Description
Technical Field
The invention relates to the technical field of coke ratio measurement, in particular to a portable coke ratio measurement device.
Background
The fiber focal ratio refers to the ratio f=f/D of the spot diameter D of the fiber perpendicular to the exit direction to the distance F of the spot from the fiber end face. Under the limitation of numerical aperture, the outgoing focal ratio of the optical fiber is the same as the incoming focal ratio in ideal cases, but in reality, due to the influence of factors such as bending of the optical fiber, processing of the end face of the optical fiber and the like, the outgoing focal ratio of the optical fiber is always smaller than the incoming focal ratio, and the light beam is more divergent. The acquisition and analysis of astronomical spectrum are important means for researching astronomical, the chemical composition of the astronomical can be determined by utilizing the spectrum of the astronomical, physical conditions such as temperature, pressure, density, magnetic field and movement speed of the astronomical can be determined, and the application of optical fiber in an astronomical telescope greatly improves the observation efficiency of the telescope on the spectrum.
Since the first astronomical instrument based on optical fiber transmission was used, the optical fiber focal ratio degradation makes the light energy more dispersed, which always affects the efficiency and accuracy of spectrum observation. While the degradation characteristics of the fiber are not completely eliminated, the magnitude of the degradation must be minimized and understood to design and optimize the overall astronomical spectroscopic observation system. With the rapid increase of the number of optical fibers in the telescope, the requirement for efficient measurement of the optical fiber exit focal ratio becomes more and more apparent.
At present, there are two main methods for measuring focal ratio degradation, as shown in fig. 4, the first method is to simulate the working state of a telescope, 411 is a laser light source, 412 is a white light source, 41, 46 and 47 are optical fiber connectors, 42 and 44 are diaphragms, 43 and 45 are lenses, 48 is a CCD camera, and 49 is a central control system; 47. 48, 49, the principle is that 47 is perpendicular to 48 surface to be emergent, 48 moves a plurality of different positions back and forth and shoots and records the facula, as shown in figure 5, then carries on linear fitting to the picture data processing of the facula, the slope of the light plate size along with shooting distance change is emergent focal ratio, a circular range parallel light is converged into the optical fiber through the lens, the emergent focal ratio result at 47 expresses that 48 can collect 90% of the whole emergent light energy in a certain emergent focal ratio range, simulates the actual performance of the optical fiber in the instrument; the second method is to use a collimated light beam with a given angle to enter the optical fiber, and the result is expressed as the full width at half maximum (FWHM) of the output ring, and corresponds to the transmission mode dispersion degree of the optical fiber to the light with the specific angle.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a portable coke ratio measuring device. The portable focal ratio measuring device has the advantages of integrating the light path, simplifying the measuring method, realizing high-efficiency portable focal ratio measurement and being not limited to laboratory environment.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a portable focal ratio measuring device comprises a light source, a first diaphragm, a second diaphragm, a first lens, a second lens, an optical sleeve, a system to be measured protecting shell, a CCD imaging target surface, a display, a central control system, a keyboard, an optical fiber to be measured and an optical fiber connector;
the light source, the first diaphragm, the second diaphragm, the first lens and the second lens are integrally fixed in the optical sleeve, the light source is arranged at the focal position of the first lens, parallel light is arranged between the first lens and the second lens, the first diaphragm shields stray light, the second diaphragm is used for determining the diameter of a light spot incident on the second lens and is marked as D, and the focal length of the second lens is marked as F; the light source, the first diaphragm, the second diaphragm, the first lens, the second lens and the optical sleeve form a fixed focal ratio output light source, the fixed focal ratio output light source outputs a light spot with the focal ratio of F/D, the protection shell of the system to be tested is used as an interface of the fixed focal ratio output light source and a subsequent light spot processing module, the vertical distance between the second lens and the protection shell of the system to be tested is the focal length F of the second lens, and the optical sleeve is sleeved in the protection shell of the system to be tested;
and the light spot processing module is formed by the protection shell of the system to be tested, the CCD, the display, the central control system and the keyboard, the CCD shoots light spot data, and the central control system processes the light spot data and outputs a result to the display. The optical fiber connector is connected to the optical fiber to be tested.
The invention is further arranged that the focal ratio measuring device has two modes of operation, one of which is a calibration operation: considering the influence of the environment on the CCD photosensitive element, before the optical fiber to be tested is tested, a fixed focus ratio output light source is connected with a light spot processing system, the set focus ratio F1 of a calibration light source is input, at the moment, a central control system can control a second diaphragm to adjust the aperture size to reach the set focus ratio, then the CCD shoots and calculates the light spot diameter D1, and the consistency of the calibration data and the environmental influence of test data is ensured.
The invention is further arranged that the second test operation is as follows: when the optical fiber to be tested is arranged at the inlet of the light spot processing system during testing, the optical fiber to be tested is inserted into the adapter, the CCD records light spots at the moment, the diameter D2 of the light spots is obtained through calculation, the focal ratio F2 of the optical fiber can be obtained through calculation by utilizing an optical fiber focal ratio calculation formula, and the optical fiber focal ratio F2 is displayed on the display.
The invention further provides that the optical fiber focal ratio calculation formula is that
The invention is further arranged that the focal ratio measuring device takes the influence of the environment on the CCD photosensitive element into consideration, and performs calibration light spot shooting before testing the optical fiber to be tested; connecting a fixed focal ratio output light source with a light spot processing system, photographing by a CCD, calculating the light spot diameter D1 of the light spot, manually inputting the focal ratio F1 of the calibration light spot, and ensuring that the calibration data is consistent with the environmental influence of the test data; under the condition that the average outgoing focal ratio of the optical fiber to be measured is known, the calibration light source can be adjusted through the second diaphragm, so that the focal ratio of the calibration light source is close to that of the optical fiber to be measured, and errors caused by regional differences of CCD photosensitive elements are reduced.
The invention is further arranged that the focal ratio measuring device can select corresponding optical fiber adapters according to different interface conditions of the optical fiber to be measured, and common optical fiber adapters include FC/PC, FC/APC and SMA; and installing an optical fiber to be detected at the inlet of the light spot processing system, inserting the optical fiber to be detected into the adapter, recording light spots by the CCD at the moment, calculating to obtain the light spot diameter D2, and calculating to obtain the focal ratio F2 of the optical fiber to be displayed on the display.
The invention further provides that the focal ratio measuring device is used as a light source for calibration operation, and other point light sources capable of providing specified focal ratio emission are used as fixed focal ratio emission modules except the mode, and the fixed focal ratio emission modules comprise tail fiber emission light sources with known emission focal ratio.
The invention further provides that the focal ratio measuring device is used as the optical fiber adapter for connecting the optical fiber to be measured and the light spot processing module, the optical fiber adapter needs to be replaced according to the joint type of the optical fiber to be measured actually, and if the optical fiber is a bare optical fiber without standard specification, the optical fiber is clamped by the bare optical fiber adapter and then inserted into the optical fiber adapter.
The beneficial effects of the invention are as follows:
1. the portable coke ratio measuring device has a plurality of complex structures of the currently mainstream coke ratio measuring means, and the integrated optical circuit simplifies the measuring method, realizes high-efficiency portable coke ratio measurement and is not limited to laboratory environment.
2. According to the portable focal ratio measuring device, under different environments, responses of CCD to the same light spot are different, and noise of light spot data is related to the environments; according to the invention, through the calibration operation before the formal test, the influence of environmental change on measurement is reduced, and the measurement precision is improved.
3. According to the portable focal ratio measuring device, in a common testing method, light spots need to be shot at a plurality of positions in the focal ratio measurement of one optical fiber, and a progressive difference method is used for replacing the measurement of the actual distance from the end face of the optical fiber to be tested to the CCD target face; according to the invention, the outgoing focal ratio of the optical fiber to be measured is calculated by using an analogy method, the outgoing focal ratio can be calculated by shooting one optical fiber only once, and the measurement efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a portable coke ratio measuring device according to the present invention;
FIG. 2 is a schematic diagram of a fiber structure to be measured of a portable focal ratio measuring device according to the present invention;
FIG. 3 is a schematic view of a bare fiber adapter of a portable focal ratio measuring device according to the present invention;
FIG. 4 is a schematic diagram of the overall structure of a prior art coke ratio measurement device;
FIG. 5 is a schematic diagram of a prior art coke ratio measurement structure.
In the figure: 101. a light source; 102. a first diaphragm; 103. a first lens; 104. a second diaphragm; 105. a second lens; 106. an optical ferrule; 107. a system protection housing to be tested; 108. CCD imaging target surface; 109. a display; 110. a central control system; 111. a keyboard; 112. an optical fiber to be measured; 113. an optical fiber connector.
Detailed Description
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
Embodiments of the present patent are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present patent and are not to be construed as limiting the present patent.
Referring to fig. 1 to 3, a portable focal ratio measuring apparatus includes a light source 101, a first diaphragm 102, a second diaphragm 104, a first lens 103, a second lens 105, an optical sleeve 106, a system to be measured protective housing 107, a CCD imaging target surface 108, a display 109, a central control system 110, a keyboard 111, an optical fiber to be measured 112, and an optical fiber connector 113;
the light source 101, the first diaphragm 102, the second diaphragm 104, the first lens 103 and the second lens 105 are integrally fixed in the optical sleeve 106, the light source 101 is placed at the focal position of the first lens 103, parallel light is arranged between the first lens 103 and the second lens 105, the first diaphragm 102 shields stray light, the second diaphragm 104 is used for determining the diameter of a light spot incident on the second lens 105 and is marked as D, and the focal length of the second lens 105 is marked as F; the light source 101, the first diaphragm 102, the second diaphragm 104, the first lens 103, the second lens 105 and the optical sleeve 106 form a fixed focal ratio output light source, the output focal ratio is a light spot with F/D, the system protection shell 107 to be tested is used as an interface of the fixed focal ratio output light source and a subsequent light spot processing module, the vertical distance between the second lens 105 and the system protection shell 107 to be tested is the focal length F of the second lens 105, and the optical sleeve 106 is sleeved in the system protection shell 107 to be tested;
the system to be tested is a light spot processing module composed of a protective shell 107 of the system to be tested, a CCD imaging target surface 108, a display 109, a central control system 110 and a keyboard 111, the CCD imaging target surface 108 shoots light spot data, the central control system 110 processes the light spot data and outputs a result on the display 109, and an optical fiber connector 113 is connected to an optical fiber 112 to be tested.
The invention has two operations, one of which is a scaling operation: considering the influence of the environment on the CCD photosensitive element, before the optical fiber 112 to be tested is tested, the fixed focus ratio output light source is connected with the light spot processing system, the set focus ratio F1 of the calibration light source is input, at this time, the central control system 110 controls the second diaphragm 104 to adjust the aperture size to reach the set focus ratio, and then the CCD photographs and calculates the light spot diameter D1, so as to ensure that the calibration data is consistent with the environmental influence of the test data. And the second step is test operation: during testing, the optical fiber 112 to be tested is arranged at the inlet of the light spot processing system, the optical fiber 112 to be tested is inserted into the adapter, at the moment, the CCD records light spots, the diameter D2 of the light spots is obtained through calculation, and the focal ratio F2 of the optical fiber is obtained through calculationIs displayed on the display 109.
The theoretical basis of the invention is as follows: definition according to the ratio of cokeWhen the receiving screen is placed perpendicular to the emergent optical axis of the optical fiber, the distance from the end face of the optical fiber is F, and the focal ratio F can be calculated when the diameter D of a light spot on the CCD target surface is equal to the distance F. Therefore, for the two operations, the incident light can be regarded as a point light source at the protection shell of the system to be tested, and then F is satisfied 1 *D 1 ＝F 2 *D 2 Therefore->
In practical use, considering the influence of the environment on the CCD photosensitive element, the calibration light spot shooting is performed before the optical fiber 112 to be tested is tested. The fixed focus ratio output light source is connected with the light spot processing system, the set focus ratio F1 of the calibration light source is input, at this time, the central control system 110 controls the second diaphragm 104 to adjust the aperture size to reach the set focus ratio, and then the CCD shoots and calculates the light spot diameter D1, so that the environment influence of the calibration data and the test data is consistent. Under the condition that the average emergent focal ratio of the optical fiber 112 to be measured is known, the calibration light source can be adjusted through the second diaphragm 104, so that the focal ratio of the calibration light source is close to the optical fiber 112 to be measured, and errors caused by the regional difference of the CCD photosensitive elements are reduced.
Referring to fig. 2, next, the optical fiber to be tested is tested, and according to different interface conditions of the optical fiber to be tested, a corresponding optical fiber adapter is selected. Common are FC/PC, FC/APC, SMA, etc. Installing an optical fiber 112 to be detected at the inlet of the light spot processing system, inserting the optical fiber to be detected into the adapter, recording light spots by the CCD at the moment, calculating to obtain a light spot diameter D2, and calculating to obtain the focal ratio F2 of the optical fiber asIs displayed on the display 109.
As a light source for calibration operation, other point light sources which can provide specified focal ratio emission can be used as a fixed focal ratio emission module, such as a tail fiber emission light source with known emission focal ratio;
referring to fig. 3, the optical fiber adapter used as the optical fiber 112 to be tested and the spot processing module needs to be replaced according to the type of the joint of the optical fiber 112 to be tested, if the bare optical fiber has no standard specification optical fiber head, the optical fiber adapter can be used for clamping and then inserted into the optical fiber adapter.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. The portable focal ratio measuring device is characterized by comprising a light source (101), a first diaphragm (102), a second diaphragm (104), a first lens (103), a second lens (105), an optical sleeve (106), a system to be measured protection shell (107), a CCD imaging target surface (108), a display (109), a central control system (110), a keyboard (111), an optical fiber to be measured (112) and an optical fiber connector (113);
the light source (101), the first diaphragm (102), the second diaphragm (104), the first lens (103) and the second lens (105) are integrally fixed in the optical sleeve (106), the light source (101) is placed at the focal position of the first lens (103), parallel light is arranged between the first lens (103) and the second lens (105), the first diaphragm (102) shields the stray light, the second diaphragm (104) is used for determining the diameter of a light spot incident on the second lens (105), the diameter is marked as D, and the focal length of the second lens (105) is marked as F; the light source (101), the first diaphragm (102), the second diaphragm (104), the first lens (103), the second lens (105) and the optical sleeve (106) form a fixed-focus-ratio output light source, the fixed-focus-ratio output light source outputs light spots with the focal ratio of F/D, the system protection shell (107) to be tested is used as an interface of the fixed-focus-ratio output light source and a subsequent light spot processing module, the vertical distance between the second lens (105) and the system protection shell (107) to be tested is the focal length F of the second lens (105), and the optical sleeve (106) is sleeved in the system protection shell (107) to be tested;
the system to be tested comprises a light spot processing module, wherein the light spot processing module is composed of a protection shell (107) of the system to be tested, a CCD imaging target surface (108), a display (109), a central control system (110) and a keyboard (111), the CCD imaging target surface (108) shoots light spot data, the central control system (110) processes the light spot data to output a result on the display (109), and the optical fiber connector (113) is connected to an optical fiber (112) to be tested.
2. The portable focal ratio measuring device of claim 1, wherein the focal ratio measuring device has two modes of operation, one of which is a scaling operation: considering the influence of the environment on the CCD photosensitive element, before the optical fiber (112) to be tested is tested, a fixed focus ratio output light source is connected with a light spot processing system, the CCD photographs and calculates the light spot diameter D1 of the light spot, and the focus ratio F1 of the calibration light spot is input.
3. The portable focal ratio measuring device of claim 2, wherein two are test operations: when the optical fiber to be tested (112) is arranged at the inlet of the light spot processing system, the optical fiber to be tested (112) is inserted into the adapter, at the moment, the CCD records light spots, the diameter D2 of the light spots is obtained through calculation, the focal ratio F2 of the optical fiber can be obtained through calculation by utilizing an optical fiber focal ratio calculation formula, and the focal ratio F2 of the optical fiber is displayed on the display (109).
4. A portable focal ratio measuring apparatus according to claim 3, wherein the optical fiber focal ratio calculation formula is
5. A portable focal ratio measuring device according to claim 1, characterized in that it performs a calibration spot shooting before testing the optical fiber (112) to be tested, taking into account the influence of the environment on the CCD photosensitive element; the set focal ratio F1 of the calibration light source is input first, at this moment, the central control system (110) can control the second diaphragm (104) to adjust the aperture size, after the set focal ratio is reached, the CCD photographs and calculates the spot diameter D1, under the condition that the average outgoing focal ratio of the optical fiber (112) to be measured is known, the calibration light source can be adjusted through the second diaphragm (104), so that the focal ratio of the calibration light source is close to the optical fiber (112) to be measured.
6. The portable focal ratio measuring device according to claim 5, wherein the focal ratio measuring device can select corresponding optical fiber adapters according to different interface conditions of the optical fiber to be measured, and commonly comprises FC/PC, FC/APC and SMA; and installing an optical fiber (112) to be detected at the inlet of the light spot processing system, inserting the optical fiber to be detected into the adapter, recording light spots by the CCD at the moment, calculating to obtain the light spot diameter D2, and displaying the calculated optical fiber focal ratio F2 on a display (109).
7. The portable focal ratio measuring apparatus of claim 6, wherein the focal ratio measuring apparatus is used as a light source for calibration operation, and other point light sources capable of providing emission of a specified focal ratio are used as fixed focal ratio emission modules except the above manner, and the fixed focal ratio emission modules comprise tail fiber emission light sources with known emission focal ratios.
8. The portable focal ratio measuring device according to claim 7, wherein the focal ratio measuring device is used as an optical fiber adapter for connecting the optical fiber to be measured (112) and the light spot processing module, and is replaced according to the type of the joint of the optical fiber to be measured (112), and if the optical fiber is a bare optical fiber without standard specification optical fiber head, the optical fiber is clamped by a bare optical fiber adapter and then inserted into the optical fiber adapter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310993352.0A CN117030197A (en) | 2023-08-09 | 2023-08-09 | Portable focal ratio measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310993352.0A CN117030197A (en) | 2023-08-09 | 2023-08-09 | Portable focal ratio measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN117030197A true CN117030197A (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310993352.0A Pending CN117030197A (en) | 2023-08-09 | 2023-08-09 | Portable focal ratio measuring device |
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| Country | Link |
|---|---|
| CN (1) | CN117030197A (en) |
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2023
- 2023-08-09 CN CN202310993352.0A patent/CN117030197A/en active Pending
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