CN115307748A - Device and method for measuring far and near field light spot modes of laser communication load - Google Patents
Device and method for measuring far and near field light spot modes of laser communication load Download PDFInfo
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- CN115307748A CN115307748A CN202210890909.3A CN202210890909A CN115307748A CN 115307748 A CN115307748 A CN 115307748A CN 202210890909 A CN202210890909 A CN 202210890909A CN 115307748 A CN115307748 A CN 115307748A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 30
- 238000003384 imaging method Methods 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The invention relates to a device and a method for measuring far and near field light spot modes of a laser communication load, wherein the device comprises a light splitting sheet, a near field testing device and a far field testing device; the near-field testing device is arranged on a reflection light path of the light splitting sheet, and the far-field testing device is arranged on a transmission light path of the light splitting sheet. The invention combines a far-field testing device and a near-field testing device to test the same device based on the light splitting function of a light splitter, the far-field testing device can measure the far-field mode of a light spot and the coaxial precision of a far-field optical axis, and the near-field testing device can complete the light spot mode of a light spot near field and the coaxial condition of near-field multiple optical axes; the device integrates the far-field light spot detection and the near-field light spot detection, has a simple structure, is convenient to carry, can perform an external field test experiment along with the laser communication load and participate in a whole satellite mechanics fore-and-aft experiment, and provides a practical feasibility scheme for the laser communication load to be measured in time.
Description
Technical Field
The invention relates to the field of laser communication, in particular to a device and a method for measuring far and near field light spot modes of a laser communication load.
Background
Along with the development process of aerospace industry, laser communication load is rapidly developed, more and more limitations are brought to the laser communication load, such as technical requirements of indexes such as miniaturization, light weight, light spot quality and receiving and transmitting coaxial precision, but the laser communication load can only be measured in a traditional mode, such as partial measurement of the indexes such as the light spot quality and the receiving and transmitting coaxial precision can be carried out by using a laboratory fixed collimator, an outfield test experiment can not be carried out along with the laser communication load, and a whole satellite mechanics fore-and-aft experiment can not be participated, so that the laser load can not be measured in time.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for measuring far and near field facula modes of a laser communication load, and provides a feasible scheme for timely measuring the laser communication load.
The technical scheme for solving the technical problems is as follows: a device for measuring far and near field light spot modes of a laser communication load comprises a light splitting sheet, a near field testing device and a far field testing device; the near-field testing device is arranged on a reflection light path of the light splitting sheet, and the far-field testing device is arranged on a transmission light path of the light splitting sheet;
the near field testing device comprises a first combined lens, a reflecting mirror, a second combined lens and a beam model detector; the first combined lens is arranged on a reflection light path of the light splitting sheet and an incident light path of the reflector at the same time, the second combined lens is arranged on a reflection light path of the reflector, and the beam model detector is arranged on a transmission light path of the second combined lens;
the far-field testing device comprises an off-axis parabolic mirror telescope and a beam analyzer; the off-axis parabolic mirror telescope is arranged on the transmission light path of the beam splitter, and the light beam analyzer is arranged opposite to the off-axis parabolic mirror telescope.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the first combined lens is composed of two oppositely arranged positive lenses.
Furthermore, the second combined lens is formed by oppositely arranging a positive lens and a negative lens.
Further, the surface shape deviation RMS value of the light splitting piece is less than lambda/30@632.8nm, and the light splitting ratio is 1:1.
furthermore, the surface type precision of the off-axis parabolic mirror telescope is superior to lambda/50@632.8nm.
Based on the device for measuring the laser communication load far and near field light spot modes, the invention also provides a method for measuring the laser communication load far and near field light spot modes.
A method for measuring the far and near field light spot modes of the laser communication load utilizes the device for measuring the far and near field light spot modes of the laser communication load to carry out measurement and comprises the following steps,
the measured laser communication load is arranged over against an incident light path of a light splitting sheet in the device, and communication laser emitted by the measured laser communication load is made to be incident to the light splitting sheet;
laser communication load near-field light spot measurement: the communication laser incident to the light splitting sheet is reflected by the light splitting sheet, is condensed by the first combined lens, the reflector and the second combined lens in sequence, and then is incident to the light beam model detector to carry out near-field light spot mode measurement;
laser communication load far-field light spot measurement: and the communication laser incident to the beam splitter is transmitted by the beam splitter and is converged into a beam analyzer through the off-axis parabolic mirror telescope to carry out far-field light spot mode measurement.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the near-field light spot mode measurement comprises near-field light spot quality analysis or/and near-field multi-optical-axis coaxial condition measurement; the far field spot pattern measurement comprises far field spot quality analysis or/and far field multi-optical axis on-axis condition measurement.
Further, in the process of measuring the coaxial condition of the near-field multiple optical axes, recording the centroid of the light spot imaging on the light beam model detector, and completing the measurement of the coaxial condition of the near-field multiple optical axes through centroid analysis.
Further, in the process of measuring the multi-optical-axis coaxial condition of the far field, the emission of the measured laser communication load is used as the optical axis reference, the reverse lighting is received, the light beam analyzer is used for measuring the light spot center deviation amount of the light spot generated by the emission of the measured laser communication load and the light spot generated by the reverse lighting, and the light spot center deviation amount is divided by the focal length of the far field testing device to obtain the multi-optical-axis far field coaxial precision.
The invention has the beneficial effects that: in the device and the method for measuring the far-field and near-field light spot modes of the laser communication load, a far-field testing device and a near-field testing device are combined to measure the same device based on the light splitting function of a light splitter, the far-field testing device can measure the far-field mode and the far-field optical axis coaxial precision of a light spot, and the near-field testing device can complete the light spot mode of a light spot near field and the near-field multi-optical axis coaxial condition; the device integrates far-field and near-field light spot detection, has a simple structure, is convenient to carry, can perform an outfield test experiment and participate in a whole satellite mechanics fore-and-aft experiment along with a laser communication load, provides a practical feasible scheme for the laser communication load to be measured in time, is suitable for the emission light spot test of different laser communication load systems, and is also suitable for outfield laser communication load coaxiality, light spot mode detection and the like; in addition, the far-field light spot detection and the near-field light spot detection are integrated to form an integrated design, so that the device error can be reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of a device for measuring far and near field light spot modes of a laser communication load according to the present invention;
FIG. 2 is a schematic structural diagram of a near field test apparatus;
fig. 3 is a schematic structural diagram of a far-field testing apparatus.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a beam splitter, 2, a near-field testing device, 21, a first combined lens, 22, a reflector, 23, a second combined lens, 24, a beam model detector, 3, a far-field testing device, 31, an off-axis parabolic mirror telescope, 32, a beam analyzer, 4 and a tested laser communication load.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
As shown in fig. 1, a device for measuring a far-field and near-field light spot mode of a laser communication load comprises a beam splitter 1, a near-field testing device 2 and a far-field testing device 3; the near-field testing device 2 is arranged on a reflection light path of the light splitting sheet 1, and the far-field testing device 3 is arranged on a transmission light path of the light splitting sheet 1;
as shown in fig. 2, the near field test apparatus 2 includes a first combined lens 21, a reflecting mirror 22, a second combined lens 23, and a beam pattern detector 24; the first combination lens 21 is disposed on the reflection optical path of the beam splitter 1 and the incident optical path of the reflector 22, the second combination lens 23 is disposed on the reflection optical path of the reflector 22, and the beam model detector 24 is disposed on the transmission optical path of the second combination lens 23;
as shown in fig. 3, the far-field testing apparatus 3 includes an off-axis parabolic mirror telescope 31 and a beam analyzer 32; the off-axis parabolic mirror telescope 31 is arranged on a transmission light path of the spectroscope 1, and the beam analyzer 32 is arranged opposite to the off-axis parabolic mirror telescope 31.
In this particular embodiment:
transmittance of the spectroscope 1 in the wavelength range of 900nm-1600 nm: the reflectivity is 50: 1; the surface accuracy RMS is better than 1/30 lambda @632.8nm.
In the near field test device 2, a 12-fold beam expander composed of a first combined lens 21, a reflecting mirror 22 and a second combined lens 23; wherein, the first combined lens 21 is composed of two oppositely arranged positive lenses. The second combined lens 23 is composed of a positive lens and a negative lens which are oppositely arranged. The beam model detector 24 is of the type XC130, and the main performance parameters are as follows: the working wave band is 900nm-1600nm, the size of a single image surface is 30um, and the size of the image surface is 320X256.
In a far-field testing device, the focal length of an off-axis paraboloid of an off-axis paraboloidal mirror telescope 31 is 1.5m, the caliber is 100mm, and the surface accuracy RMS is superior to lambda/50@632.8nm; the beam analyzer 32 model is BGP-GigE-SP1230, the main performance parameters of which are as follows: the working wave band is 900nm-1600nm, the size of a single image surface is 15um, and the size of the image surface is 640X512.
The working principle of the device for measuring the far and near field light spot modes of the laser communication load is as follows: the method comprises the steps that a laser communication load 4 to be tested (the laser communication load 4 to be tested has the functions of laser emission and laser receiving) is placed in front of the device, signal light is emitted, light beams enter a near-field testing device 2 and a far-field testing device 3 through a beam splitter 1 respectively, a reflection path enters light spots of the near-field testing device 2, the near-field light spots are contracted into a light beam model detector 24 through a first combined lens 21, a reflector 22 and a second combined lens 33 to carry out near-field light spot detection, and the coaxial condition of near-field multi-optical axis can also be measured; the transmission path is converged into a light beam analyzer 32 through an off-axis parabolic mirror telescope 31 to carry out far-field light spot detection. And the multi-light-path coaxial condition of the measured laser communication load can be performed.
Based on the device for measuring the laser communication load far and near field light spot modes, the invention also provides a method for measuring the laser communication load far and near field light spot modes.
A method for measuring the far and near field light spot modes of the laser communication load utilizes the device for measuring the far and near field light spot modes of the laser communication load to carry out measurement, as shown in figures 1 to 3, and comprises the following steps,
the measured laser communication load 4 is arranged over against an incident light path of a light splitting sheet 1 in the device, and communication laser emitted by the measured laser communication load 4 is incident to the light splitting sheet 1;
laser communication load near-field light spot measurement: the communication laser incident to the light splitting sheet 1 is reflected by the light splitting sheet 1, and after being condensed by the first combined lens 21, the reflecting mirror 22 and the second combined lens 23 in sequence, the communication laser is incident to the light beam model detector 24 for near-field light spot mode measurement;
laser communication load far field light spot measurement: the communication laser incident to the spectroscope 1 is transmitted by the spectroscope 1 and is converged into a light beam analyzer 32 through an off-axis parabolic mirror telescope 31 to carry out far-field light spot mode measurement.
In this embodiment: the near-field light spot mode measurement comprises near-field light spot quality analysis or/and near-field multi-optical-axis coaxial condition measurement; the far field spot pattern measurement comprises far field spot quality analysis or/and far field multi-optical axis on-axis condition measurement.
Specifically, in the process of measuring the coaxial condition of the near-field multiple optical axes, the centroid of the optical spot imaging on the optical beam model detector 24 is recorded, and the measurement of the coaxial condition of the near-field multiple optical axes is completed through centroid analysis. For example: the measured laser communication load 4 emits communication laser, the communication laser is reflected to the first combined lens 21, the reflecting mirror 22 and the second combined lens 23 through the beam splitter 1 to be contracted, the near-field condition of the light spot is imaged in the light beam model detector 24, the quality analysis and the mass center recording of the light spot are carried out through software in the light beam model detector 24, the near-field light spot condition is obtained through the quality analysis of the light spot, and the coaxial condition of the near-field multi-optical axis is completed through the mass center analysis.
Specifically, in the process of measuring the far-field multi-optical-axis coaxial condition, emission of the laser communication load 4 to be measured is used as an optical axis reference, reverse lighting is received, the light beam analyzer 32 is used for measuring the light spot center deviation amount of the light spot generated by emission of the laser communication load 4 to be measured and the light spot generated by reverse lighting, and the light spot center deviation amount is divided by the focal length of the far-field testing device 3 to obtain the multi-optical-axis far-field coaxial precision. The receiving and reverse lighting are realized by adopting optical fiber connection for the receiving detector, the receiving detector is separated from the receiving optical fiber at the moment, then laser is emitted in the direction of the position of the receiving optical fiber, and the mass center deviation data of the two light beams is measured on the light beam analyzer to obtain the deviation degree of the two optical axes.
In the device and the method for measuring the far-field and near-field light spot modes of the laser communication load, a far-field testing device and a near-field testing device are combined to measure the same device based on the light splitting function of a light splitting piece, the far-field testing device can measure the far-field mode and the coaxial precision of a far-field optical axis of a light spot, the near-field testing device can complete the light spot mode of a light spot near field and the coaxial condition of multiple near-field optical axes, can measure the absolute pointing of far-field light spots of different wavelengths, and can measure the coaxial condition of the optical axes of miniaturized laser communication loads of different wavelengths; the device integrates far-field and near-field light spot detection, has a simple structure, is convenient to carry, can perform an outfield test experiment and participate in a whole satellite mechanics fore-and-aft experiment along with a laser communication load, provides a practical feasible scheme for the laser communication load to be measured in time, is suitable for the emission light spot test of different laser communication load systems, and is also suitable for outfield laser communication load coaxiality, light spot mode detection and the like; in addition, the far-field light spot detection and the near-field light spot detection are integrated to form an integrated design, so that the device error can be reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A device for measuring far and near field light spot modes of laser communication loads is characterized in that: the device comprises a light splitting sheet (1), a near-field testing device (2) and a far-field testing device (3); the near-field testing device (2) is arranged on a reflection light path of the light splitting sheet (1), and the far-field testing device (3) is arranged on a transmission light path of the light splitting sheet (1);
the near field testing device (2) comprises a first combined lens (21), a reflecting mirror (22), a second combined lens (23) and a light beam model detector (24); the first combined lens (21) is arranged on a reflection light path of the light splitting sheet (1) and an incident light path of the reflector (22) at the same time, the second combined lens (23) is arranged on a reflection light path of the reflector (22), and the beam model detector (24) is arranged on a transmission light path of the second combined lens (23);
the far-field testing device (3) comprises an off-axis parabolic mirror telescope (31) and a beam analyzer (32); the off-axis parabolic mirror telescope (31) is arranged on a transmission light path of the light splitting sheet (1), and the light beam analyzer (32) is arranged opposite to the off-axis parabolic mirror telescope (31).
2. The device for measuring the far and near field optical spot patterns of the laser communication load according to claim 1, wherein: the first combined lens (21) is composed of two oppositely arranged positive lenses.
3. The apparatus of claim 1, wherein the apparatus is configured to measure near-field and far-field optical spot patterns of the laser communication payload: the second combined lens (23) is formed by oppositely arranging a positive lens and a negative lens.
4. The apparatus of claim 1, wherein the apparatus is configured to measure near-field and far-field optical spot patterns of the laser communication payload: the surface shape deviation RMS value of the light splitting sheet (1) is less than lambda/30@632.8nm, and the light splitting ratio is 1:1.
5. the apparatus of claim 1, wherein the apparatus is configured to measure near-field and far-field optical spot patterns of the laser communication payload: the surface accuracy of the off-axis parabolic mirror telescope (31) is superior to lambda/50@632.8nm.
6. A method for measuring far and near field light spot modes of laser communication loads is characterized by comprising the following steps: the device for measuring the far and near field light spot modes of the laser communication load according to any one of the preceding claims 1 to 5 comprises the following steps,
the measured laser communication load (4) is arranged over against an incident light path of the light splitting sheet (1) in the device, and communication laser emitted by the measured laser communication load (4) is incident to the light splitting sheet (1);
laser communication load near-field light spot measurement: after being reflected by the light splitting sheet (1) and condensed by the first combined lens (21), the reflector (22) and the second combined lens (23) in sequence, the communication laser incident to the light splitting sheet (1) is incident to the light beam model detector (24) for near-field light spot mode measurement;
laser communication load far-field light spot measurement: the communication laser incident to the spectroscope (1) is transmitted by the spectroscope (1) and is converged into a light beam analyzer (32) through an off-axis parabolic mirror telescope (31) to carry out far-field light spot mode measurement.
7. The method of claim 6, wherein the method comprises the steps of: the near-field light spot mode measurement comprises near-field light spot quality analysis or/and near-field multi-optical-axis coaxial condition measurement; the far field spot pattern measurement comprises far field spot quality analysis or/and far field multi-optical axis on-axis condition measurement.
8. The method of claim 7, wherein the method comprises the steps of: in the process of measuring the coaxial condition of the near-field multiple optical axes, the centroid of the light spot imaging on the light beam model detector (24) is recorded, and the measurement of the coaxial condition of the near-field multiple optical axes is completed through centroid analysis.
9. The method of claim 7, wherein the method comprises the steps of: in the process of measuring the far-field multi-optical-axis coaxial condition, emission of a measured laser communication load (4) is used as an optical axis reference, reverse lighting is received, the light beam analyzer (32) is used for measuring the light spot center deviation amount of a light spot generated by emission of the measured laser communication load (4) and a light spot generated by reverse lighting, and the light spot center deviation amount is divided by the focal length of the far-field testing device (3) to obtain the multi-optical-axis far-field coaxial precision.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210890909.3A CN115307748A (en) | 2022-07-27 | 2022-07-27 | Device and method for measuring far and near field light spot modes of laser communication load |
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| CN202210890909.3A CN115307748A (en) | 2022-07-27 | 2022-07-27 | Device and method for measuring far and near field light spot modes of laser communication load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116067629A (en) * | 2023-03-07 | 2023-05-05 | 度亘核芯光电技术(苏州)有限公司 | Optical lens detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116067629A (en) * | 2023-03-07 | 2023-05-05 | 度亘核芯光电技术(苏州)有限公司 | Optical lens detection device |
| CN116067629B (en) * | 2023-03-07 | 2023-08-22 | 度亘核芯光电技术(苏州)有限公司 | Optical lens detection device |
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