阅读说明：本技术 一种大面积信号光能量采集系统、方法 (Large-area signal light energy acquisition system and method ) 是由 周昊 刘红魏 宋耀东 王雷 李大猛 宋云峰 于 2018-07-09 设计创作，主要内容包括：一种大面积信号光能量采集系统、方法,属于光电探测技术领域。系统包括由多个微型柱透镜构成的透镜柱阵列、传能束、以及多个光电探测器；传能束包括一用于设置透镜柱阵列的传能束接收端、多根光纤束；微型柱透镜阵列的每一行微型柱透镜经一根光纤束与一个光电探测器连接。方法包括设置由多个微型柱透镜构成的透镜柱阵列、传能束和多个光电探测器；其中,传能束包括一传能束接收端及多根光纤束；将透镜柱阵列设置于传能束接收端；将微型柱透镜阵列的每一行微型柱透镜经一根光纤束与一个光电探测器连接。本发明引入光纤阵列加大探测端光接收面积以采集大视场信号光能量,并大大减少了光电探测器的数量,提高了回波信号的采集效率,降低了硬件成本。(A large-area signal light energy acquisition system and method belong to the technical field of photoelectric detection. The system comprises a lens column array formed by a plurality of micro column lenses, an energy transmission beam and a plurality of photoelectric detectors; the energy transmission beam comprises an energy transmission beam receiving end used for arranging the lens column array and a plurality of optical fiber beams; each row of micro-cylindrical lenses of the micro-cylindrical lens array is connected with a photoelectric detector through an optical fiber bundle. The method comprises the steps of arranging a lens column array consisting of a plurality of micro column lenses, an energy transmission beam and a plurality of photodetectors; the energy transmission beam comprises an energy transmission beam receiving end and a plurality of optical fiber beams; arranging the lens column array at an energy beam transmitting and receiving end; each row of micro-cylindrical lenses of the micro-cylindrical lens array is connected with a photoelectric detector through an optical fiber bundle. The invention introduces the optical fiber array to enlarge the light receiving area of the detection end so as to collect the light energy of the large-field signal, greatly reduces the number of the photoelectric detectors, improves the collection efficiency of the echo signal and reduces the hardware cost.)

1. A large-area signal light energy collection system is characterized by comprising a lens column array formed by a plurality of micro column lenses, an energy transmission beam and a plurality of photoelectric detectors; the energy transmission beam comprises an energy transmission beam receiving end used for arranging the lens column array and a plurality of optical fiber beams; each row of micro-column lenses of the micro-column lens array is connected with a photoelectric detector through an optical fiber bundle.

2. The large area signal light energy collection system according to claim 1 wherein said micro cylindrical lens is a positive cylindrical lens.

3. The large area signal light energy collection system of claim 1 wherein the energy delivery beam receiving end is located at the focal line of the micro-cylinder lens to which it is attached.

4. The large area signal light energy collection system according to claim 1, wherein the fiber bundle comprises a fiber transmission part integrated by a plurality of optical fibers, and a light guide cone for connecting with a photodetector; one end of the optical fiber transmission part is connected with a row of micro cylindrical lenses of the lens cylinder array, and the other end of the optical fiber transmission part is connected with the light guide cone.

5. The system according to claim 4, wherein the fiber bundle further comprises a fiber connector, and the fiber connector is sleeved outside the light guide cone.

6. The large area signal light energy collection system of claim 1 wherein the photodetector is an avalanche diode or a photodiode.

7. A large-area signal light energy collection method is characterized by comprising the following steps:

the method comprises the following steps of arranging a lens column array consisting of a plurality of micro column lenses, an energy transmission beam and a plurality of photoelectric detectors; the energy transmission beam comprises an energy transmission beam receiving end and a plurality of optical fiber beams;

arranging the lens column array at an energy beam transmitting and receiving end;

and connecting each row of micro cylindrical lenses of the micro cylindrical lens array with a photoelectric detector through an optical fiber bundle.

8. The method according to claim 7, wherein the optical fiber bundle comprises an optical fiber transmission part integrated by a plurality of optical fibers and a light guide cone for connecting with a photodetector; one end of the optical fiber transmission part is connected with a row of micro cylindrical lenses of the lens cylinder array, and the other end of the optical fiber transmission part is connected with the light guide cone;

the manufacturing method of the optical fiber bundle comprises the following steps:

manufacturing an optical fiber transmission part and a light guide cone;

and connecting the optical fiber transmission part with the light guide cone to form an optical fiber bundle.

9. The large area signal light energy collection method of claim 8,

the method for manufacturing the optical fiber transmission part comprises the following steps:

step 1, arranging a plurality of optical fibers into a sub-optical fiber bundle with a required width by an optical fiber arranging sheet;

step 2, laminating the plurality of sub-optical fiber bundles after the optical fiber bundles are arranged by a fixed die, and dispensing and fixing after the laminated optical fiber bundles reach the required length and thickness;

and step 3, sleeving the optical fiber bundle subjected to the dispensing with an insulating hose to form an optical fiber transmission part.

10. The method of claim 8, further comprising sleeving a fiber optic connector over a light guide cone of the fiber bundle.

Technical Field

The invention belongs to the technical field of photoelectric detection, and particularly relates to a large-area signal light energy acquisition system and method.

Background

In recent years, with the continuous development of scientific technology, the application of laser ranging is wider and wider, and laser radars have a diversified development trend, wherein all-solid-state laser radars become one of the important development directions. At present, a commonly used solid-state laser radar needs to receive signal light in a wide range of field angles and needs to collect signal light energy corresponding to different positions. However, the signal receiving area of the energy detecting element in a single chip or array is very limited and expensive. Meanwhile, the single mode of reducing the size of the photosurface by compressing the size of the light spot at the end of the receiving lens provides very high or even unrealizable index requirements for the design of the receiving lens.

The invention patent application CN101210969A discloses a gaze-type high-resolution three-dimensional imaging detector, and specifically discloses that the detector comprises an optical fiber image transmission bundle and a photoelectric detector, wherein the optical fiber image transmission bundle is composed of optical fibers, one ends of the optical fibers in the optical fiber image transmission bundle are bundled together, the end surfaces of the optical fibers form an imaging surface, and the other ends of the optical fibers are coupled with the photoelectric detector. The invention combines the optical fiber image transmission bundle with a plurality of unit photoelectric detectors, and has the advantages of high angular resolution and quick response. However, the number of pixels, the number of optical fiber bundles and the number of photodetectors adopted by the invention are 1: the relation of 1, the signal of every picture element needs to be collected like this, need to adopt a large amount of photoelectric detectors to arrange in limited space, cause the middle not to sense the dead area greatly, and still have the problem that photoelectric detectors cross talk each other to a certain extent. Moreover, the number of the used photoelectric detectors is large, and the hardware cost is increased.

The invention patent application CN102254920A discloses a preparation method of an avalanche photodiode detection array, and particularly discloses a method comprising the step of forming the avalanche photodiode array by a micro lens array, a multimode optical fiber and an avalanche photodiode point detector. The number of pixels, the number of optical fiber bundles and the number of photoelectric detectors adopted by the invention are also 1: the above problem still exists with the relationship of 1.

Disclosure of Invention

The invention aims to provide a large-area signal light energy acquisition system and method which are low in cost, high in signal acquisition efficiency, flexible in spatial arrangement and capable of effectively avoiding crosstalk.

In accordance with the above objects, the present invention provides a large area signal light energy collection system, comprising a lens column array consisting of a plurality of micro column lenses, an energy transmission beam, and a plurality of photodetectors; the energy transmission beam comprises an energy transmission beam receiving end used for arranging the lens column array and a plurality of optical fiber beams; each row of micro-column lenses of the micro-column lens array is connected with a photoelectric detector through an optical fiber bundle.

The light spot focused by the parallel light (including approximate parallel light) incident to a row of micro-cylindrical lenses is coupled with an optical fiber bundle, and is finally coupled into a photoelectric detector through the optical fiber bundle. Therefore, N rows of the lens column array correspond to N optical fiber bundles and N photoelectric detectors, signal light energy can be collected in a large area, and compared with the scheme that 1 pixel corresponds to 1 optical fiber bundle and 1 photoelectric detector to collect optical signals in the prior art, the invention greatly reduces the number of the photoelectric detectors and reduces hardware cost. In addition, the invention solves the problems of mutual crosstalk when the photoelectric detectors are arranged in a limited space and large middle non-photosensitive dead areas when the photoelectric detectors are arranged, and further solves the problem of high requirement on wide-angle lens compressed light spots due to small size of an avalanche diode array.

Preferably, the micro-cylindrical lens is a positive cylindrical lens.

Preferably, the energy beam receiving end is located at the focal line of the micro-cylindrical lens connected thereto.

Preferably, the optical fiber bundle comprises an optical fiber transmission part formed by integrating a plurality of optical fibers and a light guide cone used for connecting with a photoelectric detector; one end of the optical fiber transmission part is connected with a row of micro cylindrical lenses of the lens cylinder array, and the other end of the optical fiber transmission part is connected with the light guide cone.

The optical fiber transmission part is an integrated structure formed by a plurality of optical fibers according to the required width, length and thickness, so that one optical fiber bundle meets the light spot size formed by a line of micro-column lens imaging areas of the lens column array, and compared with the prior art, the number of the photoelectric detectors can be greatly reduced.

Preferably, the optical fiber bundle further comprises an optical fiber connector, and the optical fiber connector is sleeved outside the light guide cone.

Preferably, the photodetector is an avalanche diode or a photodiode.

A large-area signal light energy collection method comprises the following steps:

the method comprises the following steps of arranging a lens column array consisting of a plurality of micro column lenses, an energy transmission beam and a plurality of photoelectric detectors; the energy transmission beam comprises an energy transmission beam receiving end and a plurality of optical fiber beams;

arranging the lens column array at an energy beam transmitting and receiving end;

and connecting each row of micro cylindrical lenses of the micro cylindrical lens array with a photoelectric detector through an optical fiber bundle.

Preferably, the optical fiber bundle comprises an optical fiber transmission part formed by integrating a plurality of optical fibers and a light guide cone used for connecting with a photoelectric detector; one end of the optical fiber transmission part is connected with a row of micro cylindrical lenses of the lens cylinder array, and the other end of the optical fiber transmission part is connected with the light guide cone;

the manufacturing method of the optical fiber bundle comprises the following steps:

manufacturing an optical fiber transmission part and a light guide cone;

and connecting the optical fiber transmission part with the light guide cone to form an optical fiber bundle.

Preferably, the method of manufacturing the optical fiber transmission section includes:

step 1, arranging a plurality of optical fibers into a sub-optical fiber bundle with a required width by an optical fiber arranging sheet;

step 2, laminating the plurality of sub-optical fiber bundles after the optical fiber bundles are arranged by a fixed die, and dispensing and fixing after the laminated optical fiber bundles reach the required length and thickness;

and step 3, sleeving the optical fiber bundle subjected to the dispensing with an insulating hose to form an optical fiber transmission part.

Preferably, the method further comprises sleeving an optical fiber connector on the light guide cone of the optical fiber bundle.

The invention has the following beneficial effects:

the invention relates to a large-area signal light energy collecting system and method, which enlarge the light receiving area of a detection end by introducing an optical fiber array so as to achieve the purpose of better collecting large-field signal light energy on the premise of lower cost.

a) The invention is different from the traditional receiving system, adopts unique structural design and can collect signal light energy in a large area. Therefore, the problem that the requirement for wide-angle lens to compress light spots is high due to the small size of an avalanche diode array under certain conditions is solved, the number of avalanche diodes required to be used is greatly reduced, the acquisition efficiency of echo signals is improved, and the hardware cost is reduced.

b) Each avalanche diode is discrete, so that the problems that the avalanche diodes are mutually interfered, the middle non-photosensitive dead area is large when the avalanche diodes are arranged, the arrangement space is limited and the like are solved, and the signal light energy can be collected more effectively.

c) The optical fiber belongs to an optical waveguide device, wherein the key device has flexibility and can be randomly arranged, and the utilization of system space is more reasonable.

Drawings

FIG. 1 is a schematic structural diagram of a large-area signal light energy collection system according to the present invention;

FIG. 2 is a cross-sectional view of the micro-post lens of FIG. 1;

FIG. 3 is a block diagram of the energy transfer beam of FIG. 1;

FIG. 4 is a flow chart of a method for collecting light energy of a large-area signal according to the present invention;

FIG. 5 is a flow chart of a method of manufacturing the fiber optic bundle of FIG. 4;

fig. 6 is a flowchart of a method of manufacturing the optical fiber transmitting part of fig. 4.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

Referring to fig. 1, the large-area signal light energy collection system of the present invention includes a lens column array 1, an energy transmission beam 2, and a plurality of photodetectors 3. The lens column array 1 is constituted by a plurality of micro column lenses. The energy transfer beam 2 comprises an energy transfer beam receiving end 21 and a plurality of optical fiber bundles 22. The lens column array is arranged on the energy transmission beam receiving end, and is arranged in an m x n array form by a plurality of micro-column lenses, wherein m and n are natural numbers larger than 0, and a 16 x 1 lens column array is shown in the figure. The adjacent micro-cylindrical lenses are arranged in order and fixed on the energy beam transmitting and receiving end 21 in a photoresist dispensing fixing mode or a mechanical clamping fixing mode. Each row of micro cylindrical lenses of the micro cylindrical lens array is connected with one photoelectric detector through one optical fiber bundle, and when N rows of micro cylindrical lenses exist, the micro cylindrical lenses are respectively connected with N photoelectric detectors through N optical fiber bundles. The parallel light incident to the plane of the micro-cylindrical lens array, including approximately parallel light, is focused into a plurality of light spots, and the light spots are coupled into the optical fiber bundle and finally coupled into the photoelectric detector 3 through the optical fiber bundle.

As shown in fig. 2, the micro cylindrical lens is a positive cylindrical lens, the main cross-sectional view of which is like a convex lens, parallel light parallel to the main cross-section passes through the main cross-section EAGB and then converges at point F1', and the cross-section parallel to the axis is like flat glass and does not have a converging or diverging effect on light. The combined effect of the two functions is that parallel light passes through the cylindrical lens and converges to a focal line F1 'F2', and the focal line has the same length as the light passing length of the micro cylindrical lens.

As shown in fig. 3, the energy transfer beam 2 includes an energy transfer beam receiving end 21 and a plurality of optical fiber bundles 22. The optical fiber bundle 22 is a multimode optical fiber, which includes an optical fiber transmission part and a light guide cone. One end of the optical fiber transmission part is connected with a row of micro-column lenses of the lens column array 1, and the other end of the optical fiber transmission part is connected with the light guide cone. The light guide cone is used for connecting a photoelectric detector. The optical fiber transmission part is formed by integrating a plurality of optical fibers, and the optical fibers are arranged and laminated into an optical fiber bundle according to the required width, length and thickness, so that each optical fiber bundle meets the light spot size formed by a micro-column lens imaging area in a row of the lens column array. And dispensing, fixing and binding the arranged and laminated optical fiber bundles together, coupling light spots into the optical fiber bundles, and further coupling the light spots to the photoelectric detector through the light guide cone. The light guide cone is made of optical fibers by a hot melting tapering technology.

Taking the example shown in fig. 1, parallel light is incident on the lens pillar array of the detection plane, and is imaged in the region of 8mm by 26 of the lens pillar array, and the spot diameter is about 0.5 mm. If the prior art technique is used, 832 photodetectors having a size of 0.5mm are used. By adopting the scheme, only 16 photoelectric detectors are needed. Therefore, when the array is used for collecting signal light energy in a large area, the collection efficiency of echo signals can be improved by adopting the photoelectric detectors with reduced quantity, the hardware cost is reduced, and the problem that the requirement on wide-angle lens compressed light spots is high due to the small size of the photoelectric detector array is solved. Meanwhile, the photoelectric detectors are more flexibly arranged in a limited arrangement space, so that each photoelectric detector is in a discrete state, and the problems of mutual crosstalk and the like of the photoelectric detectors are solved.

Fig. 5 shows a flow chart of the manufacturing process of the optical fiber bundle. The receiving end and the tail end of the optical fiber bundle are connected into an integral structure. Specifically, the manufacturing method includes:

step S01, manufacturing an optical fiber transmission part and a light guide cone;

in step S02, the optical fiber transmission unit and the light guide cone are connected to form an optical fiber bundle.

Wherein, the light guide cone is manufactured by a hot melting tapering technology.

As shown in fig. 6, the manufacturing process of the optical fiber transmission part includes:

and step S11, arranging the optical fibers into sub optical fiber bundles with required width by the optical fiber arranging sheet.

For example, a plurality of optical fibers, e.g., 10, are arranged in a row of sub-fiber bundles. Wherein, the widths of the sub optical fiber bundles are arranged according to the requirement.

And step S12, the fixed die stacks the plurality of sub-optical fiber bundles after the arrangement, and the adhesive is dispensed and fixed after the stacked optical fiber bundles with the required length and thickness are achieved.

The sub-fiber bundles are arranged in a lamination manner by using a fixed mold, and can be arranged into a plurality of layers. And then glue is used for dispensing, fixing and forming. Wherein, the thickness and the width of the lamination are arranged according to the requirement.

Step S13, an insulating hose is sleeved outside the dispensed optical fiber bundle to form an optical fiber transmission portion.

If a black plastic hose is sleeved outside the optical fiber bundle, the optical fiber transmission part is manufactured.

Incident light is incident to the detection plane and is respectively coupled with the subsequent optical fiber bundles through the independent optical channels of the energy transmission bundles, so that light crosstalk between the incident light is avoided to a certain degree. The optical fiber belongs to an optical waveguide device, has flexibility and can be randomly arranged, so that the photoelectric detectors can also be randomly arranged and can be separately arranged, the problem that a middle non-photosensitive dead area is large during arrangement is solved, and the electromagnetic interference between the adjacent photoelectric detectors is avoided.

The photodetector may be an avalanche diode or a photodiode.

The system further comprises an optical fiber connector 5, which may be a sleeve structure, sleeved at a position where the optical fiber bundle 2 is connected with the photodetector 3. Specifically, the optical fiber connector is sleeved outside the light guide cone. The optical fiber connector can be used for light isolation, and light crosstalk between adjacent optical fibers is avoided. In addition, the optical fiber connector is used as a light guide member to be guided and coupled with the photoelectric detector, and calibration is not needed.

Fig. 4 shows a large-area signal light energy collection method of the present invention, and the method is used for the large-area signal light energy collection system. The method comprises the following steps:

step S1, setting a lens column array composed of a plurality of micro column lenses, an energy transmission beam and a plurality of photodetectors; the energy transmission beam comprises an energy transmission beam receiving end and a plurality of optical fiber beams;

step S2, arranging the lens column array at the energy beam transmitting and receiving end;

step S3, connecting each row of micro-cylindrical lenses of the micro-cylindrical lens array with a photodetector via an optical fiber bundle.

The parallel light incident to the micro-column lens array is focused into a plurality of light spots, and the light spots are coupled into the photoelectric detector through the optical fiber bundle.

The manufacturing process of the optical fiber bundle refers to the process shown in fig. 5.

The method for collecting the large-area signal light energy also comprises the step of sleeving an optical fiber connecting piece at the position where the optical fiber bundle is connected with the photoelectric detector before the optical fiber bundle is connected with the photoelectric detector. Specifically, an optical fiber connector is sleeved outside a light guide cone of the optical fiber bundle.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.