CN116679284A - Coaxial light path mechanism and laser ranging device - Google Patents

Coaxial light path mechanism and laser ranging device Download PDF

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Publication number
CN116679284A
CN116679284A CN202310473749.7A CN202310473749A CN116679284A CN 116679284 A CN116679284 A CN 116679284A CN 202310473749 A CN202310473749 A CN 202310473749A CN 116679284 A CN116679284 A CN 116679284A
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CN
China
Prior art keywords
laser
polarized
polarized laser
lens
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310473749.7A
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Chinese (zh)
Inventor
陈永泽
陈晴
黄一芮
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Shenzhen Hengtian Weiyan Technology Co ltd
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Shenzhen Hengtian Weiyan Technology Co ltd
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Application filed by Shenzhen Hengtian Weiyan Technology Co ltd filed Critical Shenzhen Hengtian Weiyan Technology Co ltd
Priority to CN202310473749.7A priority Critical patent/CN116679284A/en
Publication of CN116679284A publication Critical patent/CN116679284A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • 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
    • 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
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G01S7/4812—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver transmitted and received beams following a coaxial path

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The invention discloses a coaxial light path mechanism and a laser ranging device, wherein the coaxial light path mechanism comprises a laser emitter, a first lens, a polarization component and a Faraday rotator, and is positioned on the same light path; the laser emitter is used for emitting laser beams; the first lens is used for carrying out collimation adjustment on the laser beam; the polarization component is used for carrying out polarization filtration on the laser beams subjected to collimation adjustment so as to output first polarized laser; the Faraday rotator is used for rotating the first polarized laser and emitting the first polarized laser to a target object; when the target object reflects the first polarized laser, the first polarized laser rotates through the Faraday rotator and outputs the second polarized laser to the polarization component, so that the polarization component deflects the second polarized laser and outputs the second polarized laser to the laser receiver. According to the invention, the laser can realize the emission and the reception in the same optical path, so that the distance measurement is carried out on the target object, the internal structure is simpler, and the whole volume is greatly reduced.

Description

Coaxial light path mechanism and laser ranging device
Technical Field
The invention relates to the technical field of optics, in particular to a coaxial light path mechanism and a laser ranging device.
Background
The laser distance measuring instrument is divided into four distance measuring methods, namely a pulse method, a phase method, a triangle method and an interference method. The pulse method is a measurement technique for obtaining the target distance by directly measuring the laser flight time. Compared with the other three methods, the method has the advantages of ultra-long measuring range, high measuring speed, simple principle, wide matching of the test targets and the like. In the related art, the current laser ranging device is generally miniaturized when applied to the civil market, but the current laser ranging device is generally realized by adopting a double optical axis for laser emission and reception, so that the internal structure is complex, and the whole volume is larger.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a coaxial optical path mechanism, which includes a laser transmitter, a first lens, a polarization component, a faraday rotator, and a laser receiver, wherein the laser transmitter, the first lens, the polarization component, and the faraday rotator are located on the same optical path;
the laser emitter is used for emitting laser beams;
the first lens is used for carrying out collimation adjustment on the laser beam;
the polarization component is used for carrying out polarization filtration on the laser beams with the collimation adjusted so as to output first polarized laser;
the Faraday rotator is used for rotating the first polarized laser and emitting the first polarized laser to a target object;
when the target object reflects the first polarized laser, the first polarized laser rotates through the Faraday rotator and outputs second polarized laser to the polarization component, so that the polarization component deflects the second polarized laser and outputs the second polarized laser to the laser receiver.
Preferably, the polarizing assembly includes:
the polaroid is arranged in the light emergent direction of the first lens and is used for carrying out polarized filtering on the laser beam so as to output the first polarized laser;
and the polarization spectroscope is arranged between the polaroid and the Faraday rotator, and is used for transmitting the first polarized laser to the Faraday rotator and deflecting and outputting the reflected second polarized laser to the laser receiver.
Preferably, the angle at which the second polarized laser light is deflected by the polarizing beam splitter is 90 degrees.
Preferably, the laser device further comprises a second lens, wherein the second lens is arranged in the light entering direction of the laser receiver and is used for focusing and outputting the second polarized laser to the laser receiver.
Preferably, the first lens is a collimating lens and the second lens is a focusing lens.
Preferably, a polarization analyzer is arranged in the light emergent direction of the faraday rotator, and the polarization analyzer is used for detecting the polarization state of the first polarized laser.
Preferably, the angle by which the first polarized laser light and the second polarized laser light are rotated by the faraday rotator is 45 degrees.
Preferably, the wavelength of the laser transmitter is 895-915nm.
Another object of the present invention is to provide a laser ranging device, which includes the coaxial light path mechanism.
The scheme of the invention at least comprises the following beneficial effects:
according to the invention, the laser transmitter, the first lens, the polarization component and the Faraday rotator are arranged on the same optical path, so that the laser can be transmitted and received in the same optical path, thereby ranging the target object, enabling the internal structure to be simpler and greatly reducing the whole volume.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a coaxial optical path mechanism provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a laser ranging device according to an embodiment of the present invention;
reference numerals illustrate:
10. a laser emitter; 20. a first lens; 30. a polarizing component; 31. a polarizing plate; 32. a polarizing beamsplitter; 40. a Faraday rotator; 50. a laser receiver; 60. an analyzer; 70. a second lens; 80. a target; 90. a housing.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present invention and should not be construed as limiting the invention, and all other embodiments, based on the embodiments of the present invention, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The coaxial light path mechanism and the laser ranging device according to the embodiment of the invention are described in detail below with reference to the accompanying drawings.
The coaxial light path mechanism provided by the embodiment of the invention comprises a laser transmitter 10, a first lens 20, a polarization component 30, a Faraday rotator 40 and a laser receiver 50, wherein the laser transmitter 10, the first lens 20, the polarization component 30 and the Faraday rotator 40 are positioned on the same light path; the laser transmitter 10 is used for emitting a laser beam; the first lens 20 is used for performing collimation adjustment on the laser beam; the polarization component 30 is used for performing polarization filtration on the laser beam subjected to collimation adjustment so as to output first polarized laser light; the faraday rotator 40 is used for rotating the first polarized laser light and emitting the first polarized laser light to the target 80; when the object 80 reflects the first polarized laser light, the first polarized laser light is rotated by the faraday rotator 40 and outputs the second polarized laser light to the polarization component 30, so that the polarization component 30 deflects the second polarized laser light and outputs the second polarized laser light to the laser receiver 50.
Wherein the laser transmitter 10 may be a semiconductor laser or the like, and the wavelength of the laser transmitter 10 is 895-915nm, for example, the laser transmitter 10 of 905nm wavelength; the laser receiver 50 may be an avalanche diode, etc., after the laser transmitter 10 emits a laser beam, the laser beam may be collimated by the first lens 20, then polarized and filtered by the polarizing component 30, and then the first polarized laser is output to make the faraday rotator 40 rotate and emit the first polarized laser to the target 80, and the first polarized light reflected by the target 80 is scattered light, so the faraday rotator 40 rotates the first polarized laser along the same optical path direction, and the rotation is changed into the second polarized laser and output to the laser receiver 50.
According to the invention, the laser transmitter 10, the first lens 20, the polarization component 30 and the Faraday rotator 40 are arranged on the same optical path, so that the laser can be transmitted and received in the same optical path, thereby the distance measurement is carried out on the target object 80, the internal structure is simpler, and the whole volume is greatly reduced.
Specifically, the polarizing component 30 includes a polarizing plate 31 and a polarizing beam splitter 32, where the polarizing plate 31 is disposed in the light emitting direction of the first lens 20, and is used for polarizing and filtering the laser beam to output a first polarized laser beam; the polarization beam splitter 32 is disposed between the polarizing plate 31 and the faraday rotator 40, and transmits the first polarized laser light to the faraday rotator 40, and deflects the reflected second polarized laser light to the laser receiver 50.
In the present embodiment, the angle by which the first polarized laser light and the second polarized laser light are rotated by the faraday rotator 40 is 45 degrees; the polarizing plate 31 is an optical element capable of converting light into linearly polarized light, the polarizing plate 31 has a selective function on incident light, and can realize the effect of transmitting and blocking longitudinal oscillation light (P light) or transverse oscillation light (S light), and is generally a composite material formed by laminating a polarizing film, an inner protective film, a pressure-sensitive adhesive layer and an outer protective film, and the linear polarization purity of the laser transmitter 10 can be improved by utilizing the performance of the polarizing plate 31; after the laser transmitter 10 emits the laser beam, the laser beam can be changed into first polarized laser light with a single direction through the polarizing plate 31, so that the purity of the laser beam is improved, stray light is reduced, after the laser beam is filtered, the first polarized laser light can be transmitted to the Faraday rotator 40 through the polarizing beam splitter 32, so that the first polarized laser light is rotated by 45 degrees to be emitted to the target 80 for ranging through the Faraday rotator 40, after the target 80 reflects the first polarized laser light, the Faraday rotator 40 rotates the first polarized laser light by 45 degrees and then becomes second polarized laser light, the second polarized laser light is output to the laser receiver 50, and the distance of the target 80 can be calculated by converting a received optical signal into an electrical signal through the laser receiver 50.
It will be appreciated that when faraday rotator 40 is operated, the polarization of incident light is rotated by the magnetic field, and the rotation angle of the polarization direction of the light is Φ=fhl, where H is the magnetic field strength, L is the faraday length, and F is the Gu Erde coefficient of the material.
Specifically, the angle of deflection of the second polarized laser light by the polarizing beam splitter 32 is 90 degrees, and further includes a second lens 70, where the second lens 70 is disposed in the light incident direction of the laser receiver 50, and is used to focus and output the second polarized laser light to the laser receiver 50; further, the first lens 20 is a collimating lens, and the second lens 70 is a focusing lens; further, an analyzer 60 is disposed in the light-emitting direction of the faraday rotator 40, and the analyzer 60 is configured to detect the polarization state of the first polarized laser light.
In this embodiment, since the laser beam emitted from the laser emitter 10 has a large divergence angle, the fast axis divergence angle is generally 50 °, and the slow axis divergence angle is generally 10 °. The first lens 20 compresses the divergence angle of the laser beam by adopting a collimating lens, so that the laser beam is collimated and output to the polaroid 31, and the size of each device in the light path direction can be smaller, thereby improving the transmittance of the laser beam passing through the polaroid 31; after the first polarized laser light is reflected by the target object 80, the first polarized laser light is rotated by the analyzer 60 and the faraday rotator 40, and then the second polarized laser light can be output to the polarization beam splitter 32 to be reflected to the second lens 70, and after the second polarized laser light is focused by the second lens 70, the second polarized laser light can be output to the laser receiver 50, so that the target position can be accurately measured by calculating the emission signal and the receiving signal by the laser receiver 50.
The embodiment of the invention also provides a laser ranging device which comprises the coaxial light path mechanism. Wherein, this laser rangefinder can be distancer etc. to this laser rangefinder can include shell 90, installs in corresponding shell 90 through adopting foretell coaxial light path mechanism, can make laser can realize transmitting and receiving in same light path, carries out range finding to target 80 from this for inner structure is simpler, and greatly reduced holistic volume.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (9)

1. The coaxial light path mechanism is characterized by comprising a laser transmitter, a first lens, a polarization component, a Faraday rotator and a laser receiver, wherein the laser transmitter, the first lens, the polarization component and the Faraday rotator are positioned on the same light path;
the laser emitter is used for emitting laser beams;
the first lens is used for carrying out collimation adjustment on the laser beam;
the polarization component is used for carrying out polarization filtration on the laser beams with the collimation adjusted so as to output first polarized laser;
the Faraday rotator is used for rotating the first polarized laser and emitting the first polarized laser to a target object;
when the target object reflects the first polarized laser, the first polarized laser rotates through the Faraday rotator and outputs second polarized laser to the polarization component, so that the polarization component deflects the second polarized laser and outputs the second polarized laser to the laser receiver.
2. The coaxial light path mechanism of claim 1, wherein the polarizing assembly comprises:
the polaroid is arranged in the light emergent direction of the first lens and is used for carrying out polarized filtering on the laser beam so as to output the first polarized laser;
and the polarization spectroscope is arranged between the polaroid and the Faraday rotator, and is used for transmitting the first polarized laser to the Faraday rotator and deflecting and outputting the reflected second polarized laser to the laser receiver.
3. The coaxial optical path mechanism of claim 1, wherein the angle at which the second polarized laser light is deflected by the polarizing beamsplitter is 90 degrees.
4. The coaxial optical path mechanism of claim 1, further comprising a second lens disposed in an incoming direction of the laser receiver for focusing and outputting the second polarized laser light to the laser receiver.
5. The coaxial light path mechanism of claim 1, wherein the first lens is a collimating lens and the second lens is a focusing lens.
6. The coaxial optical path mechanism according to claim 1, wherein an analyzer is provided in the light outgoing direction of the faraday rotator, the analyzer being configured to detect the polarization state of the first polarized laser light.
7. The coaxial optical path mechanism of claim 1, wherein the angle by which the first polarized laser light and the second polarized laser light are rotated by the faraday rotator is 45 degrees.
8. The coaxial optical path mechanism of claim 1, wherein the laser transmitter has a wavelength of 895-915nm.
9. A laser ranging apparatus comprising a coaxial light path mechanism as claimed in any one of claims 1 to 8.
CN202310473749.7A 2023-04-26 2023-04-26 Coaxial light path mechanism and laser ranging device Pending CN116679284A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310473749.7A CN116679284A (en) 2023-04-26 2023-04-26 Coaxial light path mechanism and laser ranging device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310473749.7A CN116679284A (en) 2023-04-26 2023-04-26 Coaxial light path mechanism and laser ranging device

Publications (1)

Publication Number Publication Date
CN116679284A true CN116679284A (en) 2023-09-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310473749.7A Pending CN116679284A (en) 2023-04-26 2023-04-26 Coaxial light path mechanism and laser ranging device

Country Status (1)

Country Link
CN (1) CN116679284A (en)

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