CN110471178B - Polarized light polarization-preserving transmission device based on rotary half wave plate - Google Patents
Polarized light polarization-preserving transmission device based on rotary half wave plate Download PDFInfo
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- CN110471178B CN110471178B CN201910884516.XA CN201910884516A CN110471178B CN 110471178 B CN110471178 B CN 110471178B CN 201910884516 A CN201910884516 A CN 201910884516A CN 110471178 B CN110471178 B CN 110471178B
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- 230000007774 longterm Effects 0.000 abstract description 5
- 230000003068 static effect Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 3
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
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- 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
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Abstract
The invention discloses a polarized light polarization-preserving transmission device based on a rotary half-wave plate, and relates to the fields of precision measurement and optical communication. The device comprises a turntable, an auxiliary rotator module, a half wave plate, a reflecting mirror, a turntable origin measuring module and a motor control module; the auxiliary rotator module comprises a motor, a 1 st shading strip and a 1 st photoelectric switch; the turntable origin measuring module comprises a 2 nd shading strip, a 2 nd photoelectric switch and a connecting rod; the motor control module comprises a data acquisition card, a motion controller and a motor driver. The invention (1) has simple mechanical structure and large expandable space; (2) the polarization maintaining function of optical signals transmitted between the rotating component and the static component is realized; (3) the long-term operation is stable, and the angle accumulated error caused by the fluctuation of the rotating speed does not exist; (4) light transmitted by space is transmitted from the under-table to the turntable, so that the light is little affected by environment and the light power loss is low; (5) the device and the principle of polarized light transmission have universal applicability and can be used in other similar relative rotation devices.
Description
Technical Field
The invention relates to the field of precision measurement and optical communication, in particular to a polarized light polarization-preserving transmission device based on a rotary half-wave plate; the device has the characteristics of simple mechanical structure, good optical polarization-preserving transmission effect, stable long-term operation and the like, and can be widely applied to rotating systems such as laser interference, laser gyroscopes and the like.
Background
In the field of precision measurement research and optical communication using highly stable lasers, it is required to realize uninterrupted transmission of optical signals between a rotating part and a stationary part. With the development of precision measurement technology, in the optical signal transmission process, especially linearly polarized light, the problem of polarization state change caused by rotation is inevitably required to be considered.
At present, optical transmission is realized between a rotating component and a static component by adopting an optical fiber slip ring, but the optical fiber slip ring cannot realize a polarization maintaining function in the optical transmission process.
In contrast, the loss of the spatially propagated light is small in the transmission process, the polarization state of the light is changed by using the rotated half-wave plate, and the mutual offset of the change of the polarization direction caused by the rotation angle of the polarization direction of the transmitted light signal and the rotation of the turntable is ensured, so that the purpose of polarization-preserving transmission is achieved. However, to achieve that the polarization state of the light does not change as the turntable rotates, it is necessary that the angle at which the half-wave plate rotates always remains half the turntable rotation angle.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, namely the problem of polarization state change of optical signals transmitted between a rotating part and a static part, and provides a polarized light polarization-preserving transmission device based on a rotating half-wave plate.
The invention has simple mechanical structure and large expandable space, and the polarization maintaining beam transmission method can be used for other similar relative rotating parts, and has universal applicability in principle.
The purpose of the invention is realized in the following way:
polarized light vertically enters the half-wave plate, the polarization direction of emergent light changes in real time along with the rotation of the half-wave plate, and when the rotation speed of the half-wave plate is exactly half that of the turntable, and the rotation direction of the half-wave plate is opposite to that of the turntable, the polarization state of light transmitted to the turntable does not change along with the rotation of the turntable, so that the purpose of polarization-preserving transmission is achieved; meanwhile, in order to ensure that polarized light can realize polarization-preserving transmission in the long-term operation process of the device, a rotation angle compensation mechanism is adopted, when the turntable rotates for two circles, the speed of the motor is adjusted by comparing the time when the turntable and the motor pass through the origin, and the rotation angle of the turntable and the half-wave plate is always kept 2: 1.
Specifically:
the device comprises a turntable, an auxiliary rotator module, a half wave plate, a reflecting mirror, a turntable origin measuring module and a motor control module;
the auxiliary rotator module comprises a motor, a 1 st shading strip and a 1 st photoelectric switch;
the turntable origin measuring module comprises a 2 nd shading strip, a 2 nd photoelectric switch and a connecting rod;
the motor control module comprises a data acquisition card, a motion controller and a motor driver;
the positions and the connection relations are as follows:
the turntable is arranged on the optical platform or directly fixed on the ground;
the motor is arranged in the middle of the turntable base, and the rotating shaft direction of the motor is aligned with the rotating shaft of the turntable;
the 1 st shading strip is arranged on the rotating shaft of the motor along the radial direction, and the 1 st photoelectric switch is vertically arranged on the turntable base and is positioned right below the outer side of the 1 st shading strip;
the half wave plate is horizontally arranged in the middle of the rotating shaft of the motor and rotates along with the motor;
the reflecting mirror is arranged at the center position on the table top of the turntable at an angle of 45 degrees with the horizontal plane and is used for guiding vertically transmitted light to the horizontal table top;
the 2 nd shading strip is horizontally arranged at the edge of the table surface of the turntable along the radial direction, and the 2 nd photoelectric switch is arranged on the side wall of the base of the turntable through a connecting rod;
the 1 st photoelectric switch and the 2 nd photoelectric switch are respectively connected with the data acquisition card and are used for obtaining zero crossing signals of the table top of the turntable and the motor;
the data acquisition card, the motion controller, the motor driver, the motor, the 1 st shading strip and the 1 st photoelectric switch are sequentially connected, and the function of half-wave plate rotation angle compensation is realized by adjusting the rotation speed of the motor.
The invention has the following advantages and positive effects:
(1) the mechanical structure is simple, and the expandable space is large;
(2) the polarization maintaining function of optical signals transmitted between the rotating component and the static component is realized;
(3) the long-term operation is stable, and the angle accumulated error caused by the fluctuation of the rotating speed does not exist;
(4) light transmitted by space is transmitted from the under-table to the turntable, so that the light is little affected by environment and the light power loss is low;
(5) the device and the principle of polarized light transmission have universal applicability and can be used in other similar relative rotation devices.
Drawings
FIG. 1 is a schematic diagram of the structure of the present device;
FIG. 2 is an illustration of half-wave plate rotation angle compensation;
in the figure:
00-a turntable;
10-an auxiliary rotator module,
11-motor, 12-1 st shading strip, 13-1 st photoelectric switch;
20-half wave plate;
30—a mirror;
40-a turntable origin measuring module,
41-2 nd shading strip, 42-2 nd photoelectric switch, 43-connecting rod;
50-a motor control module, wherein the motor control module is connected with the motor control module,
51-a data acquisition card, 52-a motion controller, 53-a motor driver;
fig. 3 is a graph of the measurement result of one revolution of the turntable for polarized light transmission, in which:
curve 1 is the change in polarization direction of the turntable as the turntable rotates on direct transmission of polarized light,
curve 2 is the change of the polarization direction of the turntable along with the rotation of the turntable on polarized light polarization-preserving transmission of the device;
fig. 4 is a graph of the measurement of one hour polarized light transmission for operation of the device, wherein:
curve 1-change relation of polarization direction transmitted to the turntable by polarization maintaining in the turntable rotation process along with the rotation number of the turntable.
Detailed Description
In order to make the main features, basic principles and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below; it will be apparent that the described embodiments are some, but not all, embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present device is described in detail below with reference to the attached drawings and examples:
1. overall (L)
As shown in fig. 1 and 2, the device comprises a turntable 00, an auxiliary rotator module 10, a half-wave plate 20, a reflecting mirror 30, a turntable origin measuring module 40 and a motor control module 50;
the auxiliary rotator module 10 includes a motor 11, a 1 st shade bar 12, and a 1 st photoelectric switch 13;
the turntable origin measuring module 40 includes a 2 nd light shielding bar 41, a 2 nd photoelectric switch 42, and a connecting rod 43;
the motor control module 50 includes a data acquisition card 51, a motion controller 52, and a motor driver 53;
the positions and the connection relations are as follows:
the turntable 00 is arranged on the optical platform or directly fixed on the ground;
the motor 11 is arranged in the middle of the base of the turntable 00, and the rotating shaft direction of the motor 11 is aligned with the rotating shaft of the turntable 00;
the 1 st shading strip 12 is fixed on the rotating shaft of the motor 11 along the radial direction, and the 1 st photoelectric switch 13 is vertically arranged on the base of the turntable 00 and is positioned right below the outer side of the 1 st shading strip 12;
the half wave plate 20 is horizontally arranged in the middle of the rotating shaft of the motor 11 and rotates along with the motor 11;
the reflecting mirror 30 is arranged at the center position on the table top of the turntable 00 at an angle of 45 degrees with respect to the horizontal plane and is used for guiding vertically propagating light to the horizontal table top;
the 2 nd shading strip 41 is horizontally arranged at the edge of the table top of the turntable 00, and the 2 nd photoelectric switch 42 is arranged on the side wall of the base of the turntable 00 through a connecting rod 43;
the 1 st photoelectric switch 13 and the 2 nd photoelectric switch 42 are respectively connected with the data acquisition card 51 and are used for obtaining zero crossing signals of the table top of the turntable 00 and the motor 11;
the data acquisition card 51, the motion controller 52, the motor driver 53, the motor 11, the 1 st shading strip 12 and the 1 st photoelectric switch 13 are sequentially connected, and the function of compensating the rotation angle of the half wave plate 20 is realized by adjusting the rotation speed of the motor 11.
2. Functional component
1. Turntable 00
The turntable 00 is a high-precision rotary platform and is driven by a motor;
the middle rotating shaft is provided with a light-passing hole in the vertical direction.
2. Auxiliary rotator module 10
The auxiliary rotator module 10 includes a motor 11, a 1 st shade bar 12, and a 1 st photoelectric switch 13;
the positions and the connection relations are as follows:
the motor 11 is arranged in the middle of the base of the turntable 00, and the rotating shaft direction of the motor 11 is aligned with the rotating shaft of the turntable 00;
the first shading strip 12 is arranged on the rotating shaft of the motor 11 along the radial direction, and the 1 st photoelectric switch 13 is vertically arranged on the base of the turntable 00 and is positioned right below the outer side of the 1 st shading strip 12.
1) Electric motor 11
The motor 11 is a rotation mechanism with a through hole in the center shaft, such as a servo motor or a stepping motor, the diameter of the through hole is larger than 5mm, the through hole is used for driving the half wave plate 20 to rotate, and the rotation speed is half of the rotation speed of the table top of the turntable 00.
2) No. 1 shading strip 12
The 1 st light shielding strip 12 is a kind of opaque cylinder of phi 2×100mm, and origin information of the turntable 00 and the 1 st photoelectric switch 13 is acquired respectively every time the 1 st light shielding strip 12 passes the 1 st photoelectric switch 13.
3) 1 st photoelectric switch 13
The first photoelectric switch 13 is a general diffuse reflection type photoelectric switch, and the effective distance is adjustable by 30cm, so that an origin signal is generated and transmitted to the motor control module 50, and the motor 11 is controlled to rotate.
2. Half wave plate 20
The half wave plate 20 adopts a 0-level half wave plate for changing the polarization direction of the incident polarized light, so that the polarization direction change caused by rotation of the turntable 00 is mutually counteracted, and the purpose of polarization-preserving transmission is achieved.
3. Mirror 30
The mirror 30 is a general plane mirror for changing vertically propagating light into horizontally propagating light.
4. Turntable origin measuring module 40
The turntable origin measuring module 40 includes a 2 nd light shielding bar 41, a 2 nd photoelectric switch 42, and a connecting rod 43;
the positions and the connection relations are as follows:
the 2 nd shading strip 41 is horizontally arranged at the edge of the table top of the turntable 00 along the radial direction, and the 2 nd photoelectric switch 42 is arranged on the side wall of the base of the turntable 00 through a connecting rod 43;
the 2 nd light shielding strip 41 and the 2 nd photoelectric switch 42 are identical in structure and function to the 1 st light shielding strip 12 and the 1 st photoelectric switch 13, respectively, described above.
5. Motor control Module 50
The motor control module 50 comprises a data acquisition card 51, a motion controller 52 and a motor driver 53 which are connected in sequence;
1) Data acquisition card 51
The data acquisition card 51 is a general-purpose data acquisition card for transmitting origin signals of the turntable 00 and the motor 11 to the motion controller 52.
2) Motion controller 52
The motion controller 52 is a general motion controller, such as a Programmable Logic Controller (PLC) or a computer (PC), for comparing the over-origin time of the turntable 00 and the motor 11, and further transmitting a control command to the motion control card 53 to implement an angle compensation function.
3) Motor driver 53
The motor driver 53 is a general motor driver for driving the motor 11.
3. Principle of operation
1. Light transmission part
The vertically propagating polarized light L0 passes through the half-wave plate 20 and becomes light L1 having a polarization direction identical to the optical axis direction of the half-wave plate 20; when the motor 11 drives the half wave plate 20 to rotate, the polarization direction of the light L1 rotates; when the rotation speed of the half-wave plate 20 is exactly half of the rotation speed of the turntable 00 and the rotation direction is opposite to the rotation direction of the turntable 00, the polarization state of the light L1 which is reflected by the reflecting mirror 30 on the table top of the turntable 00 and becomes horizontally transmitted light L2 is kept unchanged, and the purpose of polarization-preserving transmission is achieved.
2. Half-wave plate angle compensation part
The angle rotated by the table top of the turntable 00 and the angle rotated by the motor 11 are always kept to be 2:1, so that the motor 11 changes speed once every two turns of the table surface of the turntable 00, and performs angle compensation. The specific process is that when the table top of the turntable 00 rotates for two circles, the 2 nd shading strip 41 passes over the 2 nd photoelectric switch 42 twice, and the 2 nd photoelectric switch 42 can transmit the time t1 of the turntable 00 rotating for two circles to the computer 52 through the data acquisition card 51; similarly, every time the motor 11 rotates one turn, the 1 st photoelectric switch 13 transmits the time t2 of the motor 11 rotating one turn to the computer 52, and the difference Δt=t2-t 1 between the two over-origin times, so that the motor 11 needs to change the speed Δv=aΔt, and the computer 52 transmits the change speed Δv to the motion control card 53, so that the motor 11 changes the speed, and the accumulated error of the half-wave plate rotation angle caused by unstable long-term operation speed of the motor 11 is avoided.
4. Actual measurement results
Fig. 3 shows a relationship between polarization direction of polarized light on the turntable and rotation of the turntable in two cases of polarization-preserving transmission from the lower transmission to the upper turntable and polarization-preserving transmission not performed, wherein curve 1 is a measurement result of polarization-preserving transmission not performed and curve 2 is a measurement result of polarization-preserving transmission performed.
The measuring method comprises the following steps: the polarized light is guided by the under-table through the half-wave plate and the reflecting mirror to the turntable, the light on the turntable is guided into the polarization analyzer fixed on the table surface of the turntable, firstly, the motor is kept still, the turntable rotates at a constant speed, the polarization direction of the light is recorded every 15 DEG when the turntable rotates, when the turntable rotates by 360 DEG, the turntable rotates for one circle under the condition that the polarization-preserving transmission is not recorded, the polarization direction of the light on the turntable is changed, as shown in a curve 1 of fig. 3, and then the turntable and the motor drive the half-wave plate to rotate at a speed of 2:1, repeating the above operation, recording the change of the polarization direction of the light on the turntable after one turn under the condition of polarization maintaining transmission, as shown in curve 2 of fig. 3. It is obvious that when the turntable rotates, the polarization direction of the light which is not subjected to polarization maintaining transmission changes by approximately 180 degrees, and when the turntable rotates for one turn, the polarization direction of the polarized light on the turntable does not change by more than 2.7 degrees.
In fig. 4, curve 1 shows the variation of the number of turns of the turntable with respect to the number of turns of the turntable when the apparatus is operated continuously. When the motor rotates synchronously along with the turntable, the polarization direction of the light on the table is recorded every 5 circles, and when the device runs continuously for 60 circles, the variation of the polarization direction of the light on the table is not more than 2.3 degrees and basically the same as the variation of one circle of polarization, which indicates that the device runs for a long time without the accumulated error of angles.
Claims (1)
1. A polarized light polarization-preserving transmission device based on a rotary half wave plate is characterized in that:
the device comprises a turntable (00), an auxiliary rotator module (10), a half-wave plate (20), a reflecting mirror (30), a turntable origin measuring module (40) and a motor control module (50);
the auxiliary rotator module (10) comprises a motor (11), a 1 st shading strip (12) and a 1 st photoelectric switch (13);
the turntable origin measuring module (40) comprises a 2 nd shading strip (41), a 2 nd photoelectric switch (42) and a connecting rod (43);
the motor control module (50) comprises a data acquisition card (51), a motion controller (52) and a motor driver (53);
the positions and the connection relations are as follows:
the turntable (00) is arranged on the optical platform or directly fixed on the ground;
the motor (11) is arranged in the middle of the base of the turntable (00), and the rotating shaft direction of the motor (11) is aligned with the rotating shaft of the turntable (00);
the 1 st shading strip (12) is arranged on the rotating shaft of the motor (11) along the radial direction, the 1 st photoelectric switch (13) is vertically arranged on the base of the turntable (00) and is positioned right below the outer side of the 1 st shading strip (12);
the half wave plate (20) is horizontally arranged in the middle of the rotating shaft of the motor (11) and rotates along with the motor (11);
the reflecting mirror (30) is arranged at the center position on the table top of the turntable (00) at an angle of 45 degrees with respect to the horizontal plane and is used for guiding vertically transmitted light to the horizontal table top;
the 2 nd shading strip (41) is horizontally arranged at the edge of the table top of the turntable (00) along the radial direction, and the 2 nd photoelectric switch (42) is arranged on the side wall of the base of the turntable (00) through a connecting rod (43);
the 1 st photoelectric switch (13) and the 2 nd photoelectric switch (42) are respectively connected with the data acquisition card (51) and are used for obtaining zero crossing signals of the table top of the turntable (00) and the motor (11);
the data acquisition card (51), the motion controller (52) and the motor driver (53), the motor (11), the 1 st shading strip (12) and the 1 st photoelectric switch (13) are sequentially connected, and the function of compensating the rotation angle of the half wave plate (20) is realized by adjusting the rotation speed of the motor (11);
the vertically transmitted polarized light L0 passes through the half wave plate (20) and becomes light L1 with the polarization direction consistent with the optical axis direction of the half wave plate (20); when the motor (11) drives the half wave plate (20) to rotate, the polarization direction of the light L1 rotates; when the rotating speed of the half wave plate (20) is exactly half of the rotating speed of the turntable (00) and the rotating direction is opposite to the rotating direction of the turntable (00), the polarization state of the light L1 which is reflected by the reflecting mirror (30) on the table surface of the turntable (00) and becomes horizontally transmitted is kept unchanged, and the purpose of polarization-preserving transmission is achieved;
the rotating angle of the table top of the turntable (00) and the rotating angle of the motor (11) are always kept 2:1, the motor (11) changes speed once every two turns of the table top of the turntable (00) to perform angle compensation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910884516.XA CN110471178B (en) | 2019-09-19 | 2019-09-19 | Polarized light polarization-preserving transmission device based on rotary half wave plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910884516.XA CN110471178B (en) | 2019-09-19 | 2019-09-19 | Polarized light polarization-preserving transmission device based on rotary half wave plate |
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| CN110471178B true CN110471178B (en) | 2024-01-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305599A (en) * | 1998-04-14 | 2001-07-25 | 西门子公司 | Emulator and compensator for polarization mode dispersion |
| JP2004233485A (en) * | 2003-01-29 | 2004-08-19 | Photonic Lattice Inc | Apparatus for imparting delay difference among polarized light components and polarization mode dispersion compensator |
| CN108445642A (en) * | 2018-03-09 | 2018-08-24 | 中国科学院武汉物理与数学研究所 | Turntable dual-beam transmitting device based on fiber coupler and optical filter |
| CN210666192U (en) * | 2019-09-19 | 2020-06-02 | 中国科学院武汉物理与数学研究所 | Polarized light polarization-maintaining transmission device based on rotating half-wave plate |
-
2019
- 2019-09-19 CN CN201910884516.XA patent/CN110471178B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305599A (en) * | 1998-04-14 | 2001-07-25 | 西门子公司 | Emulator and compensator for polarization mode dispersion |
| JP2004233485A (en) * | 2003-01-29 | 2004-08-19 | Photonic Lattice Inc | Apparatus for imparting delay difference among polarized light components and polarization mode dispersion compensator |
| CN108445642A (en) * | 2018-03-09 | 2018-08-24 | 中国科学院武汉物理与数学研究所 | Turntable dual-beam transmitting device based on fiber coupler and optical filter |
| CN210666192U (en) * | 2019-09-19 | 2020-06-02 | 中国科学院武汉物理与数学研究所 | Polarized light polarization-maintaining transmission device based on rotating half-wave plate |
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