Atmospheric coherence length measuring device and method with laser indication

Abstract

The invention relates to the technical field of atmospheric optical measurement, in particular to an atmospheric coherence length measuring device and method with a laser indication function, and the device comprises a telescopic module, a star guiding module, a laser star pointing module, a power supply communication module and a control module. The control module controls the laser star pointing module to carry out laser star pointing through the power supply communication module, so that the star pointing function is convenient to carry out; through laser indication of the laser star pointing module, star finding work can be better carried out, and long-time work can be carried out.

Description

Technical Field

[0001] The invention belongs to the technical field of atmospheric optical measurement, and in particular relates to an atmospheric coherence length measurement device and method with laser indication. Background Art

[0002] Atmospheric turbulence is a constantly changing flow structure in the atmosphere, which is characterized by irregularity, randomness and multi-scale. Atmospheric turbulence is caused by the uneven distribution of factors such as temperature, density and humidity in the atmosphere, which in turn leads to irregular changes in the flow speed and direction of the air. Atmospheric turbulence can cause random changes in the phase of light waves transmitted in the atmospheric channel, random fluctuations in light intensity, and fluctuations in the angle of arrival, which seriously affect the propagation quality of the light beam. The atmospheric coherence length describes the comprehensive turbulence intensity on the propagation path. Accurate measurement and research of the atmospheric coherence length is of great significance in laser communications, astronomical site selection and other aspects. The atmospheric coherence length instrument is based on the principle of differential image motion method, uses starlight as the light source, and measures the fluctuations in the angle of arrival of starlight to the surface of the CMOS (Complementary Metal-Oxide-Semiconductor) camera to calculate the atmospheric coherence length value on the entire path through the atmosphere. However, when pointing stars, the atmospheric coherence length measuring device usually uses a star pointing pen for star pointing. Each time it works, the star pointing pen needs to be adjusted to be coaxial with the telescope and guide mirror. In addition, when the equipment works outdoors for a long time at night, the star pointing pen has insufficient battery life and the laser intensity will weaken as the power is insufficient. Summary of the invention

[0003] In view of this, the present invention aims to provide an atmospheric coherence length measurement device and method with laser indication, in which a laser star pointing module is cooperated with a power supply and communication module, and the laser star pointing module is controlled by a control module to facilitate the star pointing function; through the laser indication of the laser star pointing module, the device can better perform the star-finding work and can work for a long time.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows: An atmospheric coherence length measuring device with laser indication comprises a telescope module, a guide star module, a laser star pointing module, a power supply and communication module and a control module; wherein the power supply and communication module supplies power to the telescope module, the guide star module, the laser star pointing module and the control module respectively; the control module controls the guide star module to search for and point to a target star through the power supply and communication module; the control module controls the laser star pointing module to emit laser to the target star through the power supply and communication module, thereby pointing to the target star; the control module controls the telescope module to follow the target star through the power supply and communication module, and shoots the target star.

[0005] Furthermore, the telescope module includes a telescope and a primary mirror camera arranged on the telescope; wherein the primary mirror camera is connected to the power supply and communication module; the telescope follows the guide module to follow the star so that the target star is stably imaged in the primary mirror camera; and the control module controls the primary mirror camera to shoot the target star through the power supply and communication module.

[0006] Furthermore, the guide module includes a guide mirror and a guide camera; wherein the guide camera is connected to the power supply and communication module; the control module sends a control command to the guide camera through the power supply and communication module, so that the guide mirror and the guide camera search for the target star.

[0007] Furthermore, the laser star pointing module includes a laser and a laser support assembly; wherein the laser is connected to the power supply and communication module, and the control module controls the laser to emit laser to the target star through the power supply and communication module, thereby pointing to the target star; the laser support assembly sets the laser on the telescope; the laser support assembly adjusts the pitch direction of the laser, thereby adjusting the star pointing direction of the laser.

[0008] Furthermore, the laser support assembly includes a front laser support seat, a laser support plate and a rear laser support seat; wherein, the front laser support seat and the rear laser support seat are arranged on the outer wall of the telescope barrel; the laser support plate is arranged on the front laser support seat and the rear laser support seat; the laser is arranged on the laser support plate; a gasket is provided under the laser, the gasket supports the laser and changes the pitch direction of the laser.

[0009] Furthermore, the power supply communication module includes a POE (Power over Ethernet) power supply, a POE switch, a POE decomposer and a network relay; wherein the POE power supply receives external power supply and supplies power to the POE switch and the control module; the POE switch is directly connected to the primary mirror camera and the guide camera; the POE switch is connected to the POE decomposer, the POE decomposer supplies power to the network relay, and the network relay controls the laser.

[0010] An atmospheric coherence length measuring device method with laser indication is applicable to the atmospheric coherence length measuring device with laser indication provided by the present invention, comprising the following steps: S1: Connect the power supply and communication module to the telescope module, the guide module, the laser pointer module and the control module respectively, and power on the power supply and communication module; S2: The control module turns on the telescope module, the guide module and the laser pointer module through the power supply and communication module; S3: Adjust the direction of the telescope module so that the laser star pointing module points to the target star, then adjust the telescope module so that the target star is imaged in the guide module, and turn off the laser star pointing module; S4: Continue to adjust the telescope module so that the target star is imaged in the telescope module, and the telescope module follows the star; S5: The control module starts calculating the atmospheric coherence length and saves the measurement data.

[0011] Compared with the prior art, the invention can achieve the following beneficial effects: (1) The atmospheric coherence length measurement device and method with laser indication created by the present invention improves the convenience of operation of the device by combining the laser star pointing module with the power supply and communication module, eliminates the problem of endurance, has high laser intensity, and can point to the target star more clearly; (2) In the atmospheric coherence length measurement device and method with laser indication created by the present invention, by adding an integrated POE power supply and communication module, power supply and communication with the camera and laser can be achieved using only one network cable, reducing the use of cables, making the device more concise, and reducing the possibility of cable entanglement during operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings: Figure 1 A schematic diagram of the structure of an atmospheric coherence length measuring device with laser indication according to an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the laser support assembly according to an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the power supply communication module according to an embodiment of the present invention; Figure 4 A schematic flow chart of the atmospheric coherence length measurement method with laser indication described in an embodiment of the present invention.

[0013] Description of reference numerals: 1. Power supply and communication module; 2. Control module; 3. Laser star pointing module; 4. Telescope; 5. Primary mirror camera; 6. Guide mirror; 7. Guide camera; 8. Laser; 9. Front laser support seat; 10. Laser support plate; 11. Rear laser support seat; 12. POE power supply; 13. POE switch; 14. POE decomposer; 15. Network relay. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the invention more clear, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the invention and do not constitute a limitation of the invention.

[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0017] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0019] like Figure 1As shown, the atmospheric coherence length measuring device with laser indication created by the present invention comprises a telescope module, a guide module, a power supply and communication module 1, a control module 2 and a laser star pointing module 3. Among them, the power supply and communication module 1 supplies power to the telescope module, the guide module, the control module 2 and the laser star pointing module 3 respectively; the control module 2 controls the guide module to find and point to the target star through the power supply and communication module 1; the control module 2 controls the laser star pointing module 3 to emit a laser to the target star through the power supply and communication module 1, thereby pointing to the target star; the control module 2 controls the telescope module to follow the target star through the power supply and communication module 1, and shoots the target star. In the embodiment of the present invention, the control module 2 is a computer, and the atmospheric coherence length parameter calculation software for calculating the atmospheric coherence length is loaded in the computer. In the atmospheric coherence length parameter calculation software, the binarization threshold of the image is first calculated, and the image is binarized. According to the binarization result of the image, the light spot in the image is segmented to determine the position of the light spot. Then, the grayscale value of the grayscale image of the light spot is weighted averaged according to the position of the light spot to calculate the centroid coordinates of the light spot, and then the atmospheric coherence length is obtained by using the differential imaging method (DIMM). Among them, the essence of the differential imaging method (DIMM) is the detection of the arrival angle fluctuation caused by wavefront distortion, which is reflected in the random jitter of the relative position of the two star spots (i.e., light spots) on the image plane at the receiving end. The atmospheric coherence length is obtained by counting the jitter variance of the centroid coordinates of the two star spots. The atmospheric coherence length parameter calculation software calculates the atmospheric coherence length parameter calculation result based on this differential imaging method.

[0020] The telescope module includes a telescope 4 and a primary mirror camera 5 installed on the telescope 4. The primary mirror camera 5 is installed at the eyepiece end of the telescope 4, and the primary mirror camera 5 is connected to the power supply and communication module 1; the telescope 4 follows the guide module to follow the star, so that the target star is stably imaged in the primary mirror camera 5; the control module 2 controls the primary mirror camera 5 to shoot the target star through the power supply and communication module 1. In the embodiment of the present invention, the telescope 4 uses a Cassegrain telescope with an aperture of 280mm; the resolution of the primary mirror camera 5 is 1920×1200, and the sampling frequency is 100Hz.

[0021] The guide module includes a guide mirror 6 and a guide camera 7. The guide mirror 6 is mounted on the lens barrel of the telescope 1, and the guide camera 7 is mounted at the eyepiece end of the guide mirror 6. The guide mirror 6 has a short focal length and a large field of view, so more stars can be seen. The guide camera 7 receives what the guide mirror 6 sees; the guide camera 7 is connected to the power supply and communication module 1, and the control module 2 sends a control command to the guide camera 7 through the power supply and communication module 1, so that the guide mirror 6 and the guide camera 7 can search for target stars. In the embodiment of the present invention, the resolution of the guide camera 6 is 2592×1944.

[0022] The structure of the laser star pointing module 3 is as follows: Figure 2As shown, it includes a laser 8 and a laser support assembly. Among them, the laser 8 is connected to the power supply communication module 1, and the control module 2 controls the laser 8 to emit a laser to the target star through the power supply communication module 1, thereby pointing to the target star. The laser support assembly includes a front laser support seat 9, a laser support plate 10 and a rear laser support seat 11. The front laser support seat 9 and the rear laser support seat 11 are fixed to the outer wall of the lens barrel of the telescope 4 by screws, the laser support plate 10 is fixed to the front laser support seat 9 and the rear laser support seat 11 by screws, and the laser 8 is fixed on the laser support plate 10. The azimuth direction of the laser 8 is changed by adjusting the position of the screws. A gasket is provided under the laser 8, and the pitch direction of the laser 8 is changed by changing the number of gaskets.

[0023] The structure of the power supply communication module 1 is as follows Figure 3 As shown, it includes a POE power supply 12, a POE switch 13, a POE decomposer 14 and a network relay 15. Among them, the POE power supply 12 receives external power supply and supplies power to the POE switch 13 and the control module 2; in the embodiment of the present invention, the input voltage of the POE power supply 12 is 220V, the output voltage is 48V, and the power when supplying power to the POE switch 13 is 60W. The two Gigabit network ports of the POE switch 13 are directly connected to the main mirror camera 5 and the guide camera 7 to realize the power supply and communication of the main mirror camera 5 and the guide camera 7; one network port of the POE switch 13 is connected to the POE decomposer 14, and the POE decomposer 14 supplies power to the network relay 15, the power supply voltage is 12V, and the network relay 15 controls the switch of the laser 8. In the embodiment of the present invention, the POE switch 13 preferably adopts a non-standard 12-48V POE switch, and the output of the POE switch 13 is a four-port Gigabit network output. At the same time, in order to ensure the stability of the overall mechanical structure of the device, in an embodiment of the present invention, the power supply communication module 1 is integrated, that is, the POE switch 9, the POE decomposer 10 and the network relay 11 are all small-sized devices, and are integrated into a loading box through effective spatial layout and force design. One end of the POE power supply 12 is connected to an external power supply device that provides a 220V voltage, and two wires come out of the other end of the POE power supply 12, one wire is plugged into the power supply interface of the POE switch 13 on the loading box, and the other wire is plugged into the control module 2, so that the device connected to the POE switch 13 can communicate with the control module 2. At this time, the overall volume of the power supply communication module 1 is very small, and the volume of the telescope 4 is very large. The power supply communication module 1 can be stably installed on the barrel wall of the telescope 4, and the spatial layout and force design include but are not limited to manual measurement layout, or simulation layout through existing mechanical design software and other existing mechanical design software.

[0024] The embodiment of the present invention further provides an atmospheric coherence length measurement device method with laser indication, which is applicable to the atmospheric coherence length measurement device with laser indication provided by the embodiment of the present invention, and comprises the following steps: S1: Connect the power supply and communication module 1 to the telescope module, the guide module, the laser star pointing module 3 and the control module 2 respectively, and power on the power supply and communication module 1. Specifically, the power supply and communication module 1 is connected to the primary mirror camera 5, the guide camera 7, the laser 8 and the control module 2 respectively; S2: The control module 2 turns on the telescope module, the guide module and the laser pointer module 3 through the power supply and communication module 1. Specifically, the control module 2 enables the atmospheric coherence length parameter measurement software and uses the software to turn on the primary mirror camera 5, the guide camera 7 and the laser 8 through the power supply and communication module 1; S3: Adjust the direction of the telescope module so that the laser star pointing module 3 points to the target star, then adjust the telescope module so that the target star is imaged in the guide module, and turn off the laser star pointing module 3. Specifically, adjust the direction of the telescope 4 so that the laser 8 points to the target star, then fine-tune the telescope 4 so that the target star appears in the guide camera 7, and turn off the laser 8; S4: Continue to adjust the telescope module so that the target star is imaged in the telescope module, and the telescope module follows the star. Specifically, continue to fine-tune the telescope 4 so that the target star appears in the primary mirror camera 5, and the telescope 4 follows the star. S5: the control module 2 starts to calculate the atmospheric coherence length and saves the measurement data. Specifically, the atmospheric coherence length parameter calculation software of the control module 2 starts to calculate the atmospheric coherence length and saves the measurement data.

[0025] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the disclosure of the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0026] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An atmospheric coherence length measuring device with laser indication, characterized in that: The invention comprises a telescope module, a guide module, a laser star pointing module, a power supply and communication module and a control module; wherein the power supply and communication module supplies power to the telescope module, the guide module, the laser star pointing module and the control module respectively; the control module controls the guide module to search for and point to a target star through the power supply and communication module; the control module controls the laser star pointing module to emit a laser to the target star through the power supply and communication module, thereby pointing to the target star; the control module controls the telescope module to follow the target star and photograph the target star through the power supply and communication module.

2. The atmospheric coherence length measuring device with laser indication according to claim 1, characterized in that: The telescope module includes a telescope and a primary mirror camera arranged on the telescope; wherein the primary mirror camera is connected to the power supply and communication module; the telescope follows the guide module to follow the star, so that the target star is stably imaged in the primary mirror camera; the control module controls the primary mirror camera to shoot the target star through the power supply and communication module.

3. The atmospheric coherence length measuring device with laser indication according to claim 2, characterized in that: The guide module includes a guide mirror and a guide camera; wherein the guide camera is connected to the power supply and communication module; the control module sends a control command to the guide camera through the power supply and communication module, so that the guide mirror and the guide camera search for the target star.

4. The atmospheric coherence length measuring device with laser indication according to claim 3, characterized in that: The laser star pointing module includes a laser and a laser supporting assembly; wherein the laser is connected to the power supply and communication module, and the control module controls the laser to emit laser to the target star through the power supply and communication module; the laser supporting assembly sets the laser on the telescope; the laser supporting assembly adjusts the pitch direction of the laser, thereby adjusting the star pointing direction of the laser.

5. The atmospheric coherence length measuring device with laser indication according to claim 4, characterized in that: The laser support assembly includes a front laser support seat, a laser support plate and a rear laser support seat; wherein the front laser support seat and the rear laser support seat are arranged on the outer wall of the telescope barrel; the laser support plate is arranged on the front laser support seat and the rear laser support seat; the laser is arranged on the laser support plate; a gasket is provided under the laser, and the gasket supports the laser and changes the pitch direction of the laser.

6. The atmospheric coherence length measuring device with laser indication according to claim 4, characterized in that: The power supply communication module includes a POE power supply, a POE switch, a POE decomposer and a network relay; wherein the POE power supply receives external power supply and supplies power to the POE switch and the control module; the POE switch is directly connected to the primary mirror camera and the guide camera; the POE switch is connected to the POE decomposer, the POE decomposer supplies power to the network relay, and the network relay controls the laser.

7. A method for measuring atmospheric coherence length with laser indication, applicable to the atmospheric coherence length measuring device with laser indication as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Connect the power supply and communication module to the telescope module, the guide module, the laser star pointing module and the control module respectively, and power on the power supply and communication module; S2: The control module turns on the telescope module, the guide module and the laser star pointing module through the power supply and communication module; S3: adjusting the direction of the telescope module so that the laser star pointing module points to the target star, then adjusting the telescope module so that the target star is imaged in the guide module, and closing the laser star pointing module; S4: Continue to adjust the telescope module so that the target star is imaged in the telescope module, and the telescope module follows the star; S5: The control module starts calculating the atmospheric coherence length and saves the measurement data.

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