CN115876319B - Laser far-field optical power measuring equipment - Google Patents
Laser far-field optical power measuring equipment Download PDFInfo
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- CN115876319B CN115876319B CN202310113847.XA CN202310113847A CN115876319B CN 115876319 B CN115876319 B CN 115876319B CN 202310113847 A CN202310113847 A CN 202310113847A CN 115876319 B CN115876319 B CN 115876319B
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Abstract
The invention belongs to the field of laser power detection, and relates to laser far-field optical power measuring equipment, which comprises: the system comprises a laser detection array target plate, an observation camera and a data processing unit; the laser detection array target plate includes N laser power detection units arranged in a predetermined pattern on a plane, each laser power detection unit including: a housing, a photoelectric converter, and a heat sink; the laser power signals detected by the N laser power detection units are transmitted to the data processing unit through the communication bus; the observation camera is used for collecting images of the laser detection array target plate; the data processing unit receives and processes N laser power signals detected by the N laser power detection units and calculates the power density distribution on the laser detection array target plate; and obtaining the laser power value on the target plate of the laser detection array. The device provided by the invention is convenient to measure and high in safety.
Description
Technical Field
The invention belongs to the technical field of strong laser power detection, and relates to laser far-field optical power measuring equipment.
Background
With the rapid development of laser excitation sources and optical projection, tracking and other technologies, currently, large-caliber high-power lasers are widely applied to the field. In practical design and application, in order to emit laser beams to a far field and converge the laser beams on a target to form light spots with the highest possible power density, a large-caliber emitting mirror with a large enough diameter of a main mirror is needed, and in the development and production process of a large-caliber high-power laser, whether the laser power emitted from a large-caliber emitting lens meets the design and use requirements or not, the conventional power meter cannot meet the measurement requirements, and a more convenient, quick and accurate external field special measurement means is needed.
At present, the conventional laser power in the market is a small-caliber laser power meter, the size of a detection surface is different from a few millimeters to a few tens of millimeters, and large-spot laser power measurement cannot be directly performed, so that the light spot power measurement is performed by converging a large-caliber reflector into a small light spot, meanwhile, the laser power measurement is performed by adopting a simple laser detection array method (without combining a camera), the conventional large-spot laser power measurement method is in an exploration stage, and the measurement precision is generally lower;
in the current large-spot laser power measurement, a large-caliber reflector converging method is generally adopted for spot power measurement, as shown in fig. 1, a laser beam 1 in fig. 1 is thrown to a diffuse reflector 2 and is measured by a power meter 3, and the measurement method has the following defects.
a) Poor operability
Firstly, aiming a large-caliber reflecting mirror at a laser emission port, wherein the process needs to adjust the pitching angle of the laser azimuth, firstly, enabling the laser to be emitted to a certain fixed position, then moving the large-caliber reflecting mirror to the position, and adjusting a proper angle; secondly, a baffle plate is adopted to move near the focus of the reflector, the laser convergence position is found, a laser power device is arranged near the position, finally, a plurality of groups of measurement data are read manually, the laser average power is calculated, and the operation steps are complicated.
b) Poor safety
In the process of finding a laser convergence point and moving a laser power meter to the position in the measuring process by adopting a large-caliber reflector, the process needs to be completed manually, the process needs to be repeated for light-emitting calibration, the optimal position is selected for light spot power measurement, the high-energy laser power is high, the operation process time is long, and the danger coefficient is high.
c) The spot power density distribution cannot be obtained.
The laser light spots are converged on the laser power meter probe through the lens, only the current laser power value can be measured, the power distribution of the laser light spots cannot be obtained, and the judgment of the quality of the laser light beams and the judgment of whether the laser and the emission lens have a light cutting phenomenon are not facilitated.
Disclosure of Invention
In order to solve the technical problem, the invention provides a laser far-field optical power measuring device, which comprises: the system comprises a laser detection array target plate, an observation camera and a data processing unit;
the laser detection array target plate includes N laser power detection units arranged on a plane in a predetermined pattern, each laser power detection unit including: a housing, a photoelectric converter, and a heat sink; the laser power signals detected by the N laser power detection units are transmitted to the data processing unit through a communication bus; wherein N is a positive integer greater than 20;
the observation camera is used for collecting images of the laser detection array target plate;
the data processing unit comprises a data processor and a memory, special data acquisition and detection software for laser power detection processing is arranged in the memory, the data processing unit receives N laser power signals detected by N laser power detection units, processes the N acquired laser power signal powers and calculates the power density distribution on a laser detection array target plate; and obtaining the laser power value on the target plate of the laser detection array.
According to the optical power measuring device provided by the invention, the data processing unit adopts a general-purpose computer.
The optical power measurement device according to the present invention, the observation camera includes: the device comprises a visible light camera, an infrared camera and a two-dimensional turntable, wherein the visible light camera and the infrared camera are arranged on the two-dimensional turntable, the data processing unit controls the rotation of the two-dimensional turntable through a communication bus in the test process, so that a laser detection array target plate is positioned in the fields of view of the visible light camera and the infrared camera, and the data processing unit controls and selects the camera corresponding to a detection laser wave band through the communication bus to detect a light spot image.
According to the optical power measurement device provided by the invention, the predetermined pattern of the laser power detection units on the laser detection array target plate comprises: a plurality of radial line patterns taking the center of the target plate as the center of a circle, a regular quadrilateral pattern taking the center of the target plate as the midpoint, or a plurality of circles of annular patterns taking the center of the target plate as the midpoint;
each radiation line of the plurality of radiation line patterns is provided with at least 4 laser power detection units, and the quantity of the radiation lines is more than 4;
at least 6 laser power detection units in one circle of a multi-circle annular pattern taking the center of the target plate as a midpoint; the magic number of turns is more than 4;
at least 5 optical power detection units are arranged in each row of the regular quadrilateral pattern taking the center of the target plate as the midpoint, and the total row number is not less than 4 rows.
According to the optical power measuring device provided by the invention, a thermopile or a photocell is adopted as a photoelectric converter of the laser power detecting unit;
the photoelectric converter further comprises an amplifier and a filter;
the photoelectric converter receives the laser and converts the laser into an electric signal, the electric signal is amplified by the amplifier, the interference signal is filtered by the filter, and the electric signal is transmitted to the data processing unit through the communication bus;
the housing structure of each photoelectric converter is different to adapt to detection of laser power with different intensities.
According to the optical power measuring device provided by the invention, when the thermopile is adopted by the photoelectric converter of the laser power detecting unit, the thickness of the shell of any thermopile in each row or each column is different, and the thickness of the shell in each row or each column is increased according to the number of geometric steps.
According to the optical power measuring device provided by the invention, when the photoelectric converter of the laser power detecting unit adopts the photoelectric cell, the photoelectric cell is covered with the laser attenuation sheet towards the laser direction, and the attenuation amount of the laser attenuation sheet covered by any photoelectric cell in each row or each column is increased by the exponential step.
The optical power measuring device according to the present invention is characterized in that the data processing unit receives N laser power signals detected by the N laser power detecting units, and integrates the N laser power signals to obtain the total laser power.
According to the optical power measuring device provided by the invention, when the data processing unit receives the detection signal of the photoelectric converter of the laser power detection unit and judges that the photoelectric converter is in a saturated state due to the fact that the intensity of laser irradiated onto the photoelectric converter is too high, the data processing unit discards the detection signal.
According to the optical power measuring device provided by the invention, the observation camera collects laser spot images irradiated to the laser detection array target plate and transmits the laser spot images to the data processing unit, and the data processing unit selects detection signals of each laser power detection unit positioned in the laser spot images according to the laser spot images so as to calculate the total laser power.
The device of the invention is adopted:
a) Convenient measurement
The invention mainly comprises a laser detection array target plate, an observation camera and a data processing unit, wherein a laser emission port aims at the laser detection array target plate to emit light during testing, the laser detection array target plate and the camera automatically collect facula parameters, the data processing unit calculates facula parameters to give out laser power, and the whole testing process is highly automated without repeatedly adjusting laser convergence positions by adopting a large-caliber reflector.
b) High safety
The testing process can realize automatic testing, and when no other non-testing personnel exist in the testing environment, the testing personnel can remotely operate the testing site or the testing personnel can operate the testing site in the shelter and the control room, so that the risk of the testing link is greatly reduced.
c) Can obtain the power density distribution of the light spots
The invention can fit the laser spot power density distribution through the laser spot gray level image, and can be used for analyzing the laser spot quality and primarily judging whether the laser and the emission lens have the light cutting phenomenon or not.
Drawings
FIG. 1 is a schematic diagram of a prior art large caliber reflector convergence method;
FIG. 2 is a block diagram of a laser power testing apparatus according to the present invention;
FIG. 3 is a schematic diagram of a laser detection array target plate according to the present invention;
fig. 4 is a schematic view of an observation camera according to the present invention.
The laser detection system comprises a laser beam, a diffuse reflection mirror, a power meter, a laser detection array target plate, an observation camera, a data processing unit, a thermopile, a visible light camera, an infrared camera and a two-dimensional turntable.
Description of the embodiments
The laser power measuring equipment greatly improves the power measuring precision and enriches the measuring means.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
The invention provides a laser far-field optical power measuring device, which comprises: the system comprises a laser detection array target plate, an observation camera and a data processing unit;
the laser detection array target plate includes N laser power detection units arranged on a plane in a predetermined pattern, each laser power detection unit including: a housing, a photoelectric converter, and a heat sink; the laser power signals detected by the N laser power detection units are transmitted to the data processing unit through a communication bus; wherein N is a positive integer greater than 20;
the observation camera is used for collecting images of the laser detection array target plate;
the data processing unit comprises a data processor and a memory, special data acquisition and detection software for laser power detection processing is arranged in the memory, the data processing unit receives N laser power signals detected by N laser power detection units, processes the N acquired laser power signal powers and calculates power density distribution on a laser detection array target plate; and obtaining the laser power value on the target plate of the laser detection array.
According to the optical power measuring device provided by the invention, the data processing unit adopts a general-purpose computer.
As shown in fig. 4, the optical power measurement device according to the present invention, the observation camera includes: the device comprises a visible light camera 8, an infrared camera 9 and a two-dimensional turntable 10, wherein the visible light camera and the infrared camera are arranged on the two-dimensional turntable, the data processing unit controls the rotation of the two-dimensional turntable through a communication bus in the test process, so that a laser detection array target plate is positioned in the fields of view of the visible light camera and the infrared camera, and the data processing unit controls and selects the camera corresponding to a detection laser wave band through the communication bus to detect a facula image.
According to the optical power measurement device provided by the invention, the predetermined pattern of the laser power detection units on the laser detection array target plate comprises: a plurality of radial line patterns taking the center of the target plate as the center of a circle, a regular quadrilateral pattern taking the center of the target plate as the midpoint, or a plurality of circles of annular patterns taking the center of the target plate as the midpoint;
each radiation line of the plurality of radiation line patterns is provided with at least 4 laser power detection units, and the quantity of the radiation lines is more than 4;
at least 6 laser power detection units in one circle of a multi-circle annular pattern taking the center of the target plate as a midpoint; the magic number of turns is more than 4;
at least 5 optical power detection units are arranged in each row of the regular quadrilateral pattern taking the center of the target plate as the midpoint, and the total row number is not less than 4 rows.
As shown in fig. 3, the photoelectric converter of the laser power detection unit adopts a thermopile 7 or a photocell;
the photoelectric converter further comprises an amplifier and a filter;
the photoelectric converter receives the laser and converts the laser into an electric signal, the electric signal is amplified by the amplifier, the interference signal is filtered by the filter, and the electric signal is transmitted to the data processing unit through the communication bus;
the housing structure of each photoelectric converter is different to adapt to detection of laser power with different intensities.
According to the optical power measuring device provided by the invention, when the thermopile is adopted by the photoelectric converter of the laser power detecting unit, the thickness of the shell of any thermopile in each row or each column is different, and the thickness of the shell in each row or each column is increased according to the number of geometric steps.
According to the optical power measuring device provided by the invention, when the photoelectric converter of the laser power detecting unit adopts the photoelectric cell, the photoelectric cell is covered with the laser attenuation sheet towards the laser direction, and the attenuation amount of the laser attenuation sheet covered by any photoelectric cell in each row or each column is increased by the exponential step.
The optical power measuring device according to the present invention is characterized in that the data processing unit receives N laser power signals detected by the N laser power detecting units, and integrates the N laser power signals to obtain the total laser power.
According to the optical power measuring device provided by the invention, when the data processing unit receives the detection signal of the photoelectric converter of the laser power detection unit and judges that the photoelectric converter is in a saturated state due to the fact that the intensity of laser irradiated onto the photoelectric converter is too high, the data processing unit discards the detection signal.
According to the optical power measuring device provided by the invention, the observation camera collects laser spot images irradiated to the laser detection array target plate and transmits the laser spot images to the data processing unit, and the data processing unit selects detection signals of each laser power detection unit positioned in the laser spot images according to the laser spot images so as to calculate the total laser power.
The invention mainly comprises three parts of a laser detection array target plate 4, an observation camera 5 and a data processing unit 6, wherein N (20-35) small-caliber laser power detectors can be arranged on the laser detection array target plate according to the measurement precision requirement, the laser power density at specific positions on light spots can be collected, the observation camera can collect the gray level image of the whole light spot, and the total laser power and the light spot power density distribution can be obtained by fitting and integrating the power density and the gray level.
The composition of the invention is shown in figure 2: a laser detection array target plate 4; an observation camera 5; a data processing unit 6.
The laser detection array target plate mainly comprises a diffuse reflection target plate and N small-caliber laser power meters, wherein N is an integer greater than or equal to 20. As shown in fig. 2, according to specific requirements of laser caliber and power measurement precision, N detectors are arranged in a circle with the diameter of 100-1000mm, a matched electrical module is installed behind a target board, the matched electrical module comprises a power supply module, a serial port-to-network port and other modules, during the test process, the laser power at the position of each small caliber laser power meter is collected in real time, and the diffuse reflection target board can avoid damage of an observation camera caused by specular reflection and ensure the imaging quality of light spots.
The data processing unit hardware is a general computer, special data acquisition and analysis software is installed in the data processing unit hardware, the acquired N power meter readings can be subjected to averaging treatment to obtain the laser power density at N positions, and the power density and the gray scale can be fitted to obtain the power density distribution through perspective change of the speckle image; the laser power is obtained by integrating the power density distribution.
Selecting a laser power meter with proper wave band and range according to the wavelength and power of the laser to be measured; selecting a camera type according to the laser wavelength, wherein the response wavelength of the camera needs to cover the laser wavelength; the camera resolution is selected according to the distance between the camera and the target plate and the camera view field, and the proper resolution can ensure the power measurement accuracy.
According to the invention, the N laser detectors can carry out quantity and position adjustment according to the size, shape and test precision of the light spots;
the two-dimensional turntable under the observation camera is mainly used for adjusting the azimuth and the pitching of the camera, and other adjustment modes or angle fixing can be adopted according to actual measurement conditions;
finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the embodiment of the present invention, and not for limiting, and although the embodiment of the present invention has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalent substitutions can be made to the technical solution of the embodiment of the present invention without departing from the spirit and scope of the technical solution of the embodiment of the present invention.
Claims (8)
1. A laser far-field optical power measurement apparatus, characterized in that the optical power measurement apparatus comprises: the system comprises a laser detection array target plate, an observation camera and a data processing unit;
the laser detection array target plate includes N laser power detection units and a diffuse reflection target plate arranged on a plane according to a predetermined pattern, each laser power detection unit including: a housing, a photoelectric converter, and a heat sink; the laser power signals detected by the N laser power detection units are transmitted to the data processing unit through a communication bus; wherein N is a positive integer greater than 20;
the predetermined pattern includes: a plurality of radial line patterns taking the center of the target plate as the center of the circle or a plurality of ring-shaped patterns taking the center of the target plate as the midpoint;
each radiation line of the plurality of radiation line patterns is provided with at least 4 laser power detection units, and the quantity of the radiation lines is more than 4;
at least 6 laser power detection units are arranged in one circle of the multi-circle annular pattern taking the center of the target plate as the midpoint; the number of turns is more than 4;
the shell structure of each photoelectric converter is different so as to adapt to detection of laser power with different intensities;
the observation camera is used for collecting images of the laser detection array target plate; acquiring a gray level image of the whole light spot, and fitting the power density and the gray level;
the data processing unit comprises a data processor and a memory, special data acquisition and detection software for laser power detection processing is arranged in the memory, the data processing unit receives N laser power signals detected by N laser power detection units, processes the N acquired laser power signal powers and calculates the power density distribution on a laser detection array target plate; obtaining a laser power value on a laser detection array target plate;
when the data processing unit receives a detection signal of a photoelectric converter of a laser power detection unit and judges that the detection signal is in a saturated state due to the fact that the intensity of laser irradiated onto the photoelectric converter is too high, the data processing unit discards the detection signal.
2. The laser far-field optical power measuring apparatus according to claim 1, wherein the data processing unit employs a general-purpose computer.
3. The laser far field optical power measurement apparatus of claim 1, wherein the observation camera comprises: the device comprises a visible light camera, an infrared camera and a two-dimensional turntable, wherein the visible light camera and the infrared camera are arranged on the two-dimensional turntable, the data processing unit controls the rotation of the two-dimensional turntable through a communication bus in the test process, so that a laser detection array target plate is positioned in the fields of view of the visible light camera and the infrared camera, and the data processing unit controls and selects the camera corresponding to a detection laser wave band through the communication bus to detect a light spot image.
4. The laser far-field optical power measuring apparatus according to claim 1, wherein the photoelectric converter of the laser power detecting unit employs a thermopile or a photocell;
the photoelectric converter further comprises an amplifier and a filter;
the photoelectric converter receives laser and converts the laser into an electric signal, and the electric signal is amplified by the amplifier, filtered by the filter to remove interference signals and then transmitted to the data processing unit through the communication bus.
5. The laser far-field optical power measuring apparatus according to claim 4, wherein when the photoelectric converter of the laser power detecting unit employs a thermopile, a thickness of a case of any one of the thermopiles in each row or each column is different, and the thickness of the case in each row or each column increases in an geometric progression.
6. The laser far-field optical power measuring apparatus according to claim 4, wherein when the photoelectric converter of the laser power detecting unit employs a photocell, the photocell is covered with a laser attenuation sheet toward the laser direction, and the attenuation amount of the laser attenuation sheet covered by any photocell in each row or each column is increased by an exponential step.
7. The laser far-field optical power measuring apparatus according to any one of claims 5 or 6, wherein the data processing unit receives N laser power signals detected by the N laser power detecting units, and integrates the N laser power signals to find a total laser power.
8. The laser far-field optical power measurement apparatus according to claim 1, wherein the observation camera collects laser spot images irradiated to the laser detection array target plate and transmits the laser spot images to the data processing unit, and the data processing unit selects detection signals of the respective laser power detection units located within the laser spot images according to the laser spot images to calculate a total laser power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101858779B (en) * | 2009-04-10 | 2012-01-11 | 南京理工大学 | Far-field laser power distribution measurer |
| CN104596638B (en) * | 2015-02-05 | 2017-01-25 | 中国工程物理研究院应用电子学研究所 | High-resolution multi-wavelength laser intensity distribution detector and measurement method implemented by same |
| CN206056774U (en) * | 2016-08-02 | 2017-03-29 | 中国科学院西安光学精密机械研究所 | Laser power measuring device |
| GB201621450D0 (en) * | 2016-12-16 | 2017-02-01 | Dstl | Method and apparatus for detecting a laser |
| CN207319290U (en) * | 2017-07-21 | 2018-05-04 | 西安标量光电科技有限责任公司 | One kind interference far field beam test system |
| CN111024225B (en) * | 2019-12-02 | 2021-12-31 | 西北核技术研究院 | Absolute measurement method for power distribution curve in laser far-field barrel |
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