CN116893477A - Method, device and application for adjusting coupling of space light and optical fiber in laser detection - Google Patents
Method, device and application for adjusting coupling of space light and optical fiber in laser detection Download PDFInfo
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- CN116893477A CN116893477A CN202310738814.4A CN202310738814A CN116893477A CN 116893477 A CN116893477 A CN 116893477A CN 202310738814 A CN202310738814 A CN 202310738814A CN 116893477 A CN116893477 A CN 116893477A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008878 coupling Effects 0.000 title claims abstract description 29
- 238000010168 coupling process Methods 0.000 title claims abstract description 29
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000010586 diagram Methods 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000010008 shearing Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- 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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
-
- 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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The application discloses a method, a device and an application for adjusting the coupling of space light and an optical fiber in laser detection, which are used for adjusting the end face of the optical fiber to a desired position, and comprise the following steps of; controlling the end face of the optical fiber to output appointed laser and adjusting the end face of the optical fiber to be near the theoretical focus of the lens; the end face of the optical fiber is controlled to output pulse laser, and the pulse laser is output to the AD acquisition card through the photoelectric detector; scanning a plurality of scanning positions in the whole movable range by utilizing a photoelectric detector according to a preset sequence; after the photoelectric detector finishes scanning each scanning position, obtaining a light intensity signal distribution diagram; adjusting the end face of the optical fiber according to the light intensity signal distribution diagram; and repeatedly scanning and adjusting the end face of the optical fiber to enable the emergent light spots to meet the requirements. The application provides an adjusting method, which can adjust the position of an optical fiber end by observing the spatial distribution of laser spots so as to obtain the optimal coupling efficiency.
Description
Technical Field
The application relates to the technical field of laser application, in particular to a method and a device for adjusting coupling of space light and optical fibers in laser detection and application.
Background
The laser radar maximum range is directly related to the echo power into the fiber. In all-fiber laser radar systems, there is a problem of coupling efficiency of light because light propagates from free space into the fiber. The coupling efficiency of a single-mode fiber is an important index for representing how much proportion of space light received by a lens of the fiber laser radar system can enter the system fiber. To achieve high coupling efficiency requires spatial alignment such that the fiber tip coincides with the lens focus. This results in low laser emission and reception efficiency, which affects the range of laser radar detection.
Disclosure of Invention
The embodiment of the application provides a method and a device for adjusting the coupling of space light and an optical fiber in laser detection and application thereof, which are used for providing an adjusting method.
The embodiment of the application provides a method for adjusting the coupling of space light and optical fibers in laser detection, which is used for adjusting the end face of the optical fibers to a desired position, wherein the end face of the optical fibers is arranged on an optical axis based on a first adjusting frame and is close to a corresponding theoretical focal position, the theoretical focal position corresponds to a theoretical focal length value of a lens, a photoelectric detector is arranged in front of the lens and is arranged based on a second adjusting frame, and the method for adjusting the coupling of the space light and the optical fibers in the laser detection comprises the following steps:
controlling the end face of the optical fiber to output appointed laser and adjusting the end face of the optical fiber to be near the theoretical focus of the lens;
the end face of the optical fiber is controlled to output pulse laser, the pulse laser is output to an AD acquisition card through the photoelectric detector, the photoelectric detector moves once and emits N times of pulse laser, the AD acquisition card acquires the N times of laser output light intensity, and the three times of time sequences are synchronous;
scanning a plurality of scanning positions in the whole movable range by using the photoelectric detector according to a preset sequence, wherein each scanning position can detect the intensity value of the laser for N times;
after the photoelectric detector scans all scanning positions, a light intensity signal distribution diagram is obtained, wherein the light intensity signal distribution diagram is used for describing the light intensity signal distribution of the laser signals at different positions;
adjusting the end face of the optical fiber according to the light intensity signal distribution diagram;
and repeatedly scanning and adjusting the end face of the optical fiber to enable the emergent light spots to meet the requirements.
Optionally, the first adjusting frame is a 6-dimensional adjusting frame, and is used for placing the end face of the optical fiber at a corresponding theoretical focal position on the optical axis and adjusting the position of the end face of the optical fiber.
Optionally, the specified laser output by the end face of the optical fiber is controlled to be the laser with the intensity value lower than the preset threshold value.
Optionally, verifying the collimation of the output beam of the specified laser by using a shearing interferometer to adjust the fiber end face to be near the theoretical focus of the lens.
Optionally, the second adjusting frame is a two-dimensional adjusting frame and is controlled to drive the photoelectric detector to move in the horizontal and vertical directions.
Optionally, the method further comprises:
averaging the intensity values of the N times of laser for any scanning position to obtain the intensity value of the laser at any scanning position;
and after the photoelectric detector finishes scanning each scanning position, obtaining a light intensity signal distribution diagram.
The embodiment of the application also provides a device for adjusting the coupling of the space light and the optical fiber in the laser detection, which is characterized by comprising a processor and a memory, wherein the memory is stored with a computer program, and the computer program realizes the steps of the method when being executed by the processor.
The embodiment of the application also provides a laser ranging method which is applied to laser ranging after being adjusted by the spatial light and optical fiber coupling adjusting device in laser detection.
According to the embodiment of the application, through two steps of coarse adjustment and fine adjustment, the position of the optical fiber end is adjusted by observing the spatial distribution of the laser spots, so that the optimal coupling efficiency is obtained.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a basic flowchart of a method for adjusting coupling between spatial light and an optical fiber in laser detection according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The embodiment of the application provides a method for adjusting the coupling of space light and an optical fiber in laser detection, which is used for adjusting the end face of the optical fiber to a desired position, wherein the end face of the optical fiber is arranged on an optical axis based on a first adjusting frame and is close to a corresponding theoretical focal position, and the theoretical focal position corresponds to a theoretical focal length value of a lens. In some embodiments, the first alignment frame is a 6-dimensional alignment frame for positioning the fiber end face at a corresponding theoretical focal position on the optical axis and for aligning the fiber end face. In some embodiments, the second adjusting frame is a two-dimensional adjusting frame and is controlled to drive the photoelectric detector to move in the horizontal and vertical directions. The photoelectric detector is arranged in front of the lens and based on the second adjusting frame, as shown in fig. 1, and the method for adjusting the coupling between the space light and the optical fiber in the laser detection comprises the following steps:
in step S101, the control fiber end face outputs a specified laser light, and adjusts the fiber end face to the vicinity of the theoretical focal point of the lens. In some embodiments, the specified laser light output by the fiber end face is controlled to be laser light with an intensity value below a preset threshold. For example, the end face of the optical fiber may be configured to output a predetermined laser beam at 1550nm, which is relatively weak, or may have other intensities, which are not shown here. In some embodiments, the collimation of a given laser output beam may be verified using a shearing interferometer to adjust the fiber facet to near the theoretical focus of the lens.
The designated laser will be emitted through the lens, and if the fiber end face is just at the lens focus, the output beam is parallel light. The degree of collimation of the output beam can be initially verified using a shearing interferometer. After laser is input into the shearing interferometer, fresnel reflection is formed on the front surface and the rear surface of the 45-degree optical flat plate, and interference fringes of two reflected light beams are observed through a top scattering sheet carved with reference lines. The incident beam is collimated if the interference fringes and reference line are parallel, otherwise divergent or convergent.
Whether the interference fringes and the reference lines are parallel or not in the shearing interferometer is observed by naked eyes, the adjusting method is not accurate enough, the end face of the optical fiber can be initially adjusted to be near the focal point of the lens through the shearing interferometer, namely, the step S101 is a coarse adjusting step, and the subsequent steps are accurately adjusted.
In step S102, the optical fiber end face is controlled to output pulse laser, the pulse laser is output to the AD acquisition card via the photodetector, the photodetector moves once every time the N pulse laser is emitted, the AD acquisition card acquires the N laser output light intensities, and the three time sequences are synchronous. In the embodiment of the application, the photoelectric detector is arranged in front of the lens, and the photoelectric detector is arranged on a two-dimensional scanning adjusting frame, so that the photoelectric detector can move accurately in the horizontal and vertical directions, and the step length of each movement reaches the mu m level (the smaller the value is, the more accurate the measurement result is).
The optical fiber end face outputs pulse laser, the pulse laser irradiates onto the photoelectric detector after passing through the lens, the output of the photoelectric detector is connected to the AD acquisition card, each time of emitting N laser pulses (the laser emitting frequency is very high, N can be 100 or other integers), the photoelectric detector moves once, and meanwhile the AD acquisition card acquires the light intensity of the N laser outputs and maintains the time sequence synchronization relation of the three.
In step S103, the photodetector is used to scan a plurality of scanning bits in the entire movable range according to a preset sequence, and each scanning bit can detect N laser intensity values. For example, the photodetector is scanned from left to right, from bottom to top, from right to left, and from cycle to cycle, and N laser intensity values can be detected at each position.
In step S104, after the photodetector scans each scanning position, a light intensity signal distribution map is obtained, where the light intensity signal distribution map is used to describe the light intensity signal distribution of the laser signal at different positions.
In step S105, the fiber end face is adjusted according to the light intensity signal distribution pattern.
In step S107, the scanning and the adjusting of the fiber end face are repeated, so that the emitted light spot meets the requirement.
The optical fiber end face 6-dimensional adjusting frame can be specifically adjusted according to light intensity distribution, and the horizontal and pitching can be adjusted accordingly due to real-time accurate feedback signals, so that the strongest point of the light spot emitted through the lens is at the center.
According to the embodiment of the application, by adopting a rough adjustment and fine adjustment two-step efficient adjustment method for the laser detection optical fiber and the lens, the position of the optical fiber end is adjusted by observing the spatial distribution of laser spots, so that the optimal coupling efficiency is obtained, and the action distance of laser detection is improved.
In some embodiments, further comprising: averaging the intensity values of the N times of laser for any scanning position to obtain the intensity value of the laser at any scanning position;
after the photoelectric detector scans each scanning position, a light intensity signal distribution diagram is obtained, wherein the distribution diagram describes the light intensity signal distribution of the laser signal at different positions.
The method of the application obtains the optimal coupling efficiency by observing the spatial distribution of the laser spots and adjusting the position of the optical fiber end head according to the spatial distribution, and improves the action distance of laser detection. In some applications the scanning range can be enlarged, and the stepping value of the photoelectric detector is smaller, so that more accurate adjustment is realized.
The embodiment of the application also provides a device for adjusting the coupling of the space light and the optical fiber in the laser detection, which is characterized by comprising a processor and a memory, wherein the memory is stored with a computer program, and the computer program realizes the steps of the method when being executed by the processor.
The embodiment of the application also provides a laser ranging method which is applied to laser ranging after being adjusted by the spatial light and optical fiber coupling adjusting device in laser detection.
It should be noted that, in the embodiments of the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
Claims (8)
1. The method for adjusting the coupling of the space light and the optical fiber in the laser detection is characterized by being used for adjusting the end face of the optical fiber to a desired position, wherein the end face of the optical fiber is arranged on an optical axis based on a first adjusting frame and is close to a corresponding theoretical focal position, the theoretical focal position corresponds to a theoretical focal length value of a lens, a photoelectric detector is arranged in front of the lens and is arranged based on a second adjusting frame, and the method for adjusting the coupling of the space light and the optical fiber in the laser detection comprises the following steps:
controlling the end face of the optical fiber to output appointed laser and adjusting the end face of the optical fiber to be near the theoretical focus of the lens;
the end face of the optical fiber is controlled to output pulse laser, the pulse laser is output to an AD acquisition card through the photoelectric detector, the photoelectric detector moves once and emits N times of pulse laser, the AD acquisition card acquires the N times of laser output light intensity, and the three times of time sequences are synchronous;
scanning a plurality of scanning positions in the whole movable range by using the photoelectric detector according to a preset sequence, wherein each scanning position can detect the intensity value of the laser for N times;
after the photoelectric detector scans all scanning positions, a light intensity signal distribution diagram is obtained, wherein the light intensity signal distribution diagram is used for describing the light intensity signal distribution of the laser signals at different positions;
adjusting the end face of the optical fiber according to the light intensity signal distribution diagram;
and repeatedly scanning and adjusting the end face of the optical fiber to enable the emergent light spots to meet the requirements.
2. The method of adjusting spatial light and fiber coupling in laser detection according to claim 1, wherein the first adjusting frame is a 6-dimensional adjusting frame for positioning the fiber end face at a corresponding theoretical focal position on the optical axis and adjusting the position of the fiber end face.
3. The method for adjusting the coupling between space light and an optical fiber in laser detection according to claim 1, wherein the specified laser output by the end face of the optical fiber is controlled to be the laser with the intensity value lower than the preset threshold value.
4. The method of claim 1, further comprising verifying the collimation of the output beam of the specified laser using a shearing interferometer to adjust the fiber end face to near the theoretical focal point of the lens.
5. The method of adjusting spatial light and fiber coupling in laser detection according to claim 1, wherein the second adjusting frame is a two-dimensional adjusting frame controlled to drive the photodetector to move in horizontal and vertical directions.
6. The method for adjusting the coupling between spatial light and an optical fiber in laser detection according to claim 1, further comprising:
averaging the intensity values of the N times of laser for any scanning position to obtain the intensity value of the laser at any scanning position;
and after the photoelectric detector finishes scanning each scanning position, obtaining a light intensity signal distribution diagram.
7. A device for adjusting the coupling of spatial light to an optical fiber in laser detection, comprising a processor and a memory, said memory having stored thereon a computer program which, when executed by the processor, implements the steps of the method according to any of claims 1 to 6.
8. A laser ranging method, wherein the laser ranging method is applied after the adjustment of the spatial light and optical fiber coupling adjustment device in the laser detection according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310738814.4A CN116893477A (en) | 2023-06-20 | 2023-06-20 | Method, device and application for adjusting coupling of space light and optical fiber in laser detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310738814.4A CN116893477A (en) | 2023-06-20 | 2023-06-20 | Method, device and application for adjusting coupling of space light and optical fiber in laser detection |
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| CN116893477A true CN116893477A (en) | 2023-10-17 |
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| CN202310738814.4A Pending CN116893477A (en) | 2023-06-20 | 2023-06-20 | Method, device and application for adjusting coupling of space light and optical fiber in laser detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117250694A (en) * | 2023-11-17 | 2023-12-19 | 鹏城实验室 | Optical fiber coupling adjustment system and adjustment method |
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2023
- 2023-06-20 CN CN202310738814.4A patent/CN116893477A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117250694A (en) * | 2023-11-17 | 2023-12-19 | 鹏城实验室 | Optical fiber coupling adjustment system and adjustment method |
| CN117250694B (en) * | 2023-11-17 | 2024-02-13 | 鹏城实验室 | Optical fiber coupling adjustment system and adjustment method |
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