CN117782313A - Laser far-field parameter measurement system and method - Google Patents
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Abstract
The invention relates to the technical field of laser parameter measurement, in particular to a laser far-field parameter measurement system and method, comprising the following steps: the light source modulation component modulates laser; the reflection detection component is used for carrying out reflection detection on the modulated laser; the data acquisition component acquires spot information subjected to reflection detection; the demodulation component demodulates the modulated laser to obtain a demodulated laser signal; and the signal processing component analyzes and processes the obtained demodulated laser signal and the spot information to obtain the laser far-field parameters. The invention modulates and demodulates the laser by arranging the light source modulation component and the demodulation component, achieves the anti-interference aim, carries out reflection detection on the laser by the reflection detection component, and collects the facula information by the data acquisition component; the demodulated laser signal and the spot information are analyzed and processed through the signal processing component, the laser far-field parameters are obtained, the measurement of the optical power under the sunlight interference is realized, and the accuracy of the measurement result can be improved.
Description
Technical Field
The invention relates to the technical field of laser parameter measurement, in particular to a laser far-field parameter measurement system and method.
Background
In external field laser experiments such as laser space communication and laser active detection, the measurement of optical power needs to be carried out under sunlight interference, and the measurement result of a common optical power meter in the market is superposition of the optical power of the wavelength laser and the optical power of the wavelength in the environment light. Therefore, the conventional laser power meter cannot meet the requirements of the outfield laser experiment, and causes larger errors on experimental data.
The difficulty of measuring weak laser power in sunlight is divided into two aspects: on one hand, weak laser signal detection is realized; on the other hand, the measured signal is separated from the daylight background. The weak laser signal has two meanings, namely, the laser signal has weaker optical power, and when laser reaches a target surface through long-distance transmission (km level) in the atmosphere, the power density of a light spot can be reduced by a plurality of orders of magnitude due to the combined action of a divergence angle and atmospheric absorption.
Disclosure of Invention
Object of the invention
The invention aims to provide a system and a method for measuring laser far-field parameters, which are simple and quick and improve the accuracy of measured laser parameters.
(II) technical scheme
In order to solve the above problems, the present invention provides a laser far-field parameter measurement system, including:
the device comprises a light source modulation assembly, a reflection detection assembly, a data acquisition assembly, a demodulation assembly and a signal processing assembly;
the light source modulation component modulates laser;
the reflection detection component is used for carrying out reflection detection on the modulated laser;
the data acquisition component acquires spot information subjected to reflection detection;
the demodulation component demodulates the modulated laser to obtain a demodulated laser signal;
and the signal processing component analyzes and processes the obtained demodulated laser signal and the spot information to obtain laser far-field parameters.
In another aspect of the present invention, preferably, the light source modulation assembly includes: the system comprises a laser to be tested and a GPS synchronous circuit, wherein the laser to be tested is in data communication, the GPS synchronous circuit receives GPS satellite time synchronous signals, and the laser to be tested modulates laser according to the GPS satellite signals.
In another aspect of the present invention, preferably, the reflection detection assembly includes a diffuse reflection target and a detector;
the diffuse reflection target is provided with a through hole, the detector is arranged on the surface, far away from the light source modulation component, of the diffuse reflection target, and the detector corresponds to the through hole, so that the modulated laser reaches the detector through the through hole.
In another aspect of the present invention, preferably, the data acquisition assembly includes an image acquisition component and a detector data acquisition component; the light spot information comprises first light spot information and second light spot information;
the image acquisition component acquires first light spot information of the diffuse reflection target and sends the first light spot information to the signal processing component;
and the detector data acquisition component acquires second light spot information of the detector and sends the second light spot information to the signal processing component.
In another aspect of the present invention, preferably, the demodulation component includes a high-speed synchronous acquisition circuit and a GPS receiver;
the detector converts the received optical signal of the modulated laser into an electrical signal;
the high-speed synchronous acquisition circuit receives the electric signals and the GPS satellite time synchronous signals received by the GPS receiver to demodulate the modulated laser, and a demodulated laser signal is obtained.
In another aspect of the present invention, preferably, the signal processing component includes an upper computer, and the upper computer receives and analyzes the demodulated laser signal and the spot information to obtain a laser far-field parameter.
In another aspect of the present invention, preferably, the signal processing component includes a host computer, and the host computer receives and analyzes the demodulated laser signal and the spot information, and acquiring the laser far-field parameter includes:
establishing a coordinate system by taking the center of the diffuse reflection target as an origin, taking the direction of the diffuse reflection target surface parallel to the horizontal direction as an X axis and taking the direction of the diffuse reflection target surface perpendicular to the horizontal direction as a Y axis;
the image acquisition component acquires first light spot information of the diffuse reflection target and sends the first light spot information to the signal processing component to acquire light spot center position information;
according to the obtained information of the center of the light spot, the position of the diffuse reflection target is adjusted so that the center of the light spot is positioned at the right center of the diffuse reflection target;
when the light spot center is positioned at the right center of the diffuse reflection target, respectively acquiring the position information of the information point of the whole light spot in the coordinate system;
and acquiring second light spot information of the detector according to the position of the detector in the diffuse reflection target and the detector data acquisition component based on the demodulated laser signal, and corresponding the second light spot information to the position information of the information point of the whole light spot in the coordinate system to acquire a laser far-field parameter.
In another aspect of the present invention, it is preferable to include obtaining the information point of the entire spot using the following formula:
f (x, y) -T <0, i.e. background, where f (x, y) =0;
f (x, y) -T >0, i.e. the target, then the value of f (x, y) is kept unchanged here;
；
wherein T is the threshold value of the background area and the target area in the laser image, H (z) is the curve function of the gray level histogram of the laser image, the gray level value corresponding to the minimum value point of the curve function is T, and the pixel point larger than T is the information point of the light spot in the image.
In another aspect of the present invention, it is preferable to include acquiring spot center position information using the following formula:
；/>；
wherein x is c Indicating the central position of the light spotPut abscissa, y c The abscissa I (x, y) representing the center position of the spot represents the gray value of the information point at the position (x, y), x represents the abscissa of the information point at the position (x, y), and y represents the ordinate of the information point at the position (x, y).
In another aspect of the present invention, preferably, a method of measuring using the laser far field parameter measurement system described above, comprises:
modulating laser;
carrying out reflection detection on the modulated laser;
collecting spot information after reflection detection;
demodulating the modulated laser to obtain a demodulated laser signal;
and analyzing and processing the obtained demodulated laser signal and the spot information to obtain the laser far-field parameters.
(III) beneficial effects
The technical scheme of the invention has the following beneficial technical effects:
the invention modulates and demodulates the laser by arranging the light source modulation component and the demodulation component, achieves the anti-interference aim, carries out reflection detection on the laser by the reflection detection component, and collects the facula information by the data acquisition component; the demodulated laser signal and the spot information are analyzed and processed through the signal processing component, the laser far-field parameters are obtained, the measurement of the optical power under the sunlight interference is realized, and the accuracy of the measurement result can be improved.
Drawings
FIG. 1 is an overall block diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of a light source modulation assembly according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a reflection detection assembly and image acquisition components and structure of one embodiment of the present invention;
FIG. 4 is a detector module circuit of one embodiment of the invention;
FIG. 5 is a schematic diagram of a detector distribution for one embodiment of the present invention;
FIG. 6 is a schematic diagram of a signal processing component of one embodiment of the present invention;
reference numerals:
1: laser to be measured, 2: GPS synchronization circuit, 3: diffuse reflection target, 7: image acquisition part, 4: detector array, 5: high-speed synchronous acquisition circuit, 6: GPS receiver, 8: and an upper computer.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
A layer structure schematic diagram according to an embodiment of the present invention is shown in the drawings. The figures are not drawn to scale, wherein certain details may be exaggerated and some details may be omitted for clarity. The shapes of the various regions, layers and relative sizes, positional relationships between them shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
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.
In the description of the present invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention will be described in more detail below with reference to the accompanying drawings. Like elements are denoted by like reference numerals throughout the various figures. For clarity, the various features of the drawings are not drawn to scale.
Example 1
A laser far field parameter measurement system, fig. 1 shows an overall block diagram of one embodiment of the present invention, as shown in fig. 1, comprising: the device comprises a light source modulation assembly, a reflection detection assembly, a data acquisition assembly, a demodulation assembly and a signal processing assembly; the details of the laser far-field parameters are not limited herein, and optionally, the laser far-field parameters include: the laser intensity space-time distribution, the laser power, the light spot center position, the surrounding size and the like are obtained by directly measuring by using test equipment, and parameters such as the laser power, the light spot center position, the surrounding size and the like are calculated by using the laser intensity space-time distribution;
the light source modulation component modulates laser; the specific content of the light source modulation assembly is not limited herein, and those skilled in the art will understand that laser modulation is a process of modulating using laser light as a carrier wave as long as modulation can be accomplished. The laser has excellent time coherence and space coherence, is similar to radio waves, is easy to modulate, has extremely high frequency of light waves, and has large capacity for transmitting information. In addition, the divergence angle of the laser beam is small, the light energy is highly concentrated, the transmission is long-distance, and the confidentiality is easy. The laser modulation can be largely classified into an internal modulation and an external modulation. Specific laser beam modulation methods, such as electro-optic modulation, acousto-optic modulation, magneto-optic modulation, direct modulation and the like, are common; FIG. 2 is a schematic view of a light source modulation assembly according to an embodiment of the present invention; as shown in fig. 2, in this embodiment, a laser 1 to be tested and a GPS synchronization circuit 2 are in data communication, the GPS synchronization circuit 2 receives a GPS satellite time synchronization signal, the laser 1 to be tested modulates laser according to the GPS satellite signal, and in an outfield laser experiment, measurement of laser power is realized through a sampling/holding and differential amplification technology; the sampling/holding of the signals is realized by control pulses, and the time sequence of the control pulses determines the sampling/holding time and the sampling/holding result; in order to perform correlated double sampling on an input signal, two control pulses and a signal pulse show a correlation in time sequence. However, the timing of the input signal is determined by the semiconductor laser modulation signal, so that the modulation signal is time-synchronized with the two control pulses in the sample/hold circuit, thereby ensuring the relevant timing relationship. The distance between the laser modulation end and the power measurement end is usually far, and the synchronization cannot be realized by adopting a cable. Therefore, the long-distance time unification is realized by adopting a global positioning system time system technology (Global Position System timing);
the reflection detection component is used for carrying out reflection detection on the modulated laser; without limiting the specifics of the reflection detection assembly herein, FIG. 3 shows a schematic diagram of the structure of a reflection detection assembly according to one embodiment of the present invention, as shown in FIG. 3, including a diffuse reflection target 3 and a detector 4; the diffuse reflection target 3 is provided with a through hole, the detector 4 is arranged on the diffuse reflection target and far away from the surface of the light source modulation component, and the detector 4 corresponds to the through hole, so that the modulated laser reaches the detector 4 through the through hole. The number of the through holes and the detectors is not limited, alternatively, the number of the through holes can be the same, the number of the through holes is larger than the number of the detectors, further, a plurality of through holes are distributed in an array to form a through hole array, the plurality of detectors are distributed in an array to form a detector array, the distance between the through hole array and the detector array is the same, each detector can correspond to one through hole, and the modulated laser reaches the detector 4 through the through hole; further, the detector includes a visible light detector and a near infrared detector, by which the laser energy at a specific point is sampled. FIG. 4 is a circuit of a detector module according to an embodiment of the present invention, as shown in FIG. 4, because the laser wavelength range covers the visible light and the near infrared light, and a combination test of the visible light detector and the near infrared detector is required, the wavelength range of the visible light detector is 0.4-1.1m, the wavelength range of the near infrared detector is 0.9-2.6m, the detector can judge the position and the shape of the light spot according to the graph collected by the image collecting component, and flexibly arrange the position of each sensor according to the position, so as to collect the parameter indexes such as the power density and the distribution of the light spot according to the requirement, and FIG. 5 is a schematic diagram of the detector distribution according to an embodiment of the present invention, as shown in FIG. 5, the number of the visible light detector and the near infrared detector is the same;
the data acquisition component acquires spot information subjected to reflection detection; the specific content of the data acquisition component is not limited herein, and optionally, in this embodiment, the data acquisition component includes an image acquisition component 7 and a detector data acquisition component; the light spot information comprises first light spot information and second light spot information;
the image acquisition component 7 acquires first light spot information of the diffuse reflection target 3 and sends the first light spot information to the signal processing component; the specific content of the image acquisition component 7 is not limited, and the image acquisition component 7 can be a CMOS camera, a CCD camera or the like, and the specific content of the first light spot information is not limited, and optionally, the first light spot information is a light spot image of the laser light of the target surface of the diffuse reflection target 3 acquired by the image acquisition component 7, and the light spot center position and the light spot circumference size can be obtained through the light spot image. The position and the overall dimension of the image acquisition component 7 are designed as shown in fig. 3, and according to the corresponding position, wherein θ is the reflection residual angle, and α is the angle between the normal of the reflecting plate and the incident laser. Because the light spot test precision requirement is <5mm, according to the loading requirement, the distance between the image acquisition component 7 and the diffuse reflection target surface 3 cannot be too far, the distance is 1m, the light spot precision is 5mm, and the maximum optical resolution rho of the image acquisition component 7 can be calculated according to the distance:
；
the detector data acquisition component acquires second light spot information of the detector and sends the second light spot information to the signal processing component; the specific content of the second light spot information is not limited, and optionally, in this embodiment, the second light spot information is laser power information;
the demodulation component demodulates the modulated laser to obtain a demodulated laser signal; without limiting the specific content of the demodulation component, the demodulation component optionally includes a high-speed synchronous acquisition circuit 5 and a GPS receiver 6;
the detector 4 converts the received optical signal of the modulated laser light into an electrical signal;
the high-speed synchronous acquisition circuit 5 receives the electric signals and the GPS satellite time synchronous signals received by the GPS receiver 6 to demodulate the modulated laser, so as to obtain demodulated laser signals;
the signal processing component analyzes and processes the obtained demodulated laser signal and the spot information to obtain a laser far-field parameter, the signal processing component comprises an upper computer 8, the upper computer 8 receives and analyzes and processes the demodulated laser signal and the spot information to obtain the laser far-field parameter, and the signal processing component comprises:
establishing a coordinate system by taking the center of the diffuse reflection target 3 as an origin, taking the direction of the target surface of the diffuse reflection target 3, which is parallel to the horizontal direction, as an X axis and taking the direction of the target surface of the diffuse reflection target 3, which is perpendicular to the horizontal direction, as a Y axis;
the image acquisition component 7 acquires first light spot information of the diffuse reflection target 3 and sends the first light spot information to the signal processing component to acquire light spot center position information;
according to the obtained information of the center of the light spot, the position of the diffuse reflection target 3 is adjusted so that the center of the light spot is positioned at the right center of the diffuse reflection target 3;
when the light spot center is positioned at the right center of the diffuse reflection target 3, respectively acquiring the position information of the information point of the whole light spot in the coordinate system; further obtaining the central position information and the girth size of the laser spot,
based on the demodulated laser signals, acquiring second light spot information of the detector according to the position of the detector in the diffuse reflection target 3 and the detector data acquisition component, and corresponding the second light spot information to the position information of the information points of the whole light spot in the coordinate system to obtain the optical power of each information point of the laser light spot; and acquiring laser far-field parameters. Wherein the laser far field parameters include at least one of laser intensity spatial-temporal distribution, laser power, spot centroid position, and girth size.
Further, in this embodiment, the information point of the whole light spot is obtained by using the following formula:
f (x, y) -T <0, i.e. background, where f (x, y) =0;
f (x, y) -T >0, i.e. the target, then the value of f (x, y) is kept unchanged here;
；
wherein T is the threshold value of the background area and the target area in the laser image, H (z) is the curve function of the gray level histogram of the laser image, the gray level value corresponding to the minimum value point of the curve function is T, and the pixel point larger than T is the information point of the light spot in the image.
Further, in this embodiment, the method includes obtaining the spot center position information by using the following formula:
；/>；
wherein x is c An abscissa indicating the position of the center of the spot, y c The abscissa I (x, y) representing the center position of the spot represents the gray value of the information point at the position (x, y), x represents the abscissa of the information point at the position (x, y), and y represents the ordinate of the information point at the position (x, y).
According to the embodiment, the light source modulation component and the power density component are arranged to modulate and demodulate laser, so that the acquisition of laser far-field parameters is realized, the measurement of optical power under sunlight interference is realized, and the accuracy of a measurement result can be improved.
Example two
A method of making measurements using a laser far field parameter measurement system as described above, comprising:
modulating laser;
carrying out reflection detection on the modulated laser;
collecting spot information after reflection detection;
demodulating the modulated laser to obtain a demodulated laser signal;
and analyzing and processing the obtained demodulated laser signal and the spot information to obtain the laser far-field parameters.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
In the above description, technical details of patterning, etching, and the like of each layer are not described in detail. It will be appreciated by those skilled in the art that layers, regions, etc. of the desired shape may be formed by various means known in the art. In addition, to form the same structure, those skilled in the art can also devise methods that are not exactly the same as those described above.
The invention has been described above with reference to the embodiments thereof. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the invention, and such alternatives and modifications are intended to fall within the scope of the invention.
Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and alterations can be made hereto without departing from the spirit and scope of the invention.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. A laser far field parameter measurement system, comprising:
the device comprises a light source modulation assembly, a reflection detection assembly, a data acquisition assembly, a demodulation assembly and a signal processing assembly;
the light source modulation component modulates laser;
the reflection detection component is used for carrying out reflection detection on the modulated laser;
the data acquisition component acquires spot information subjected to reflection detection;
the demodulation component demodulates the modulated laser to obtain a demodulated laser signal;
and the signal processing component analyzes and processes the obtained demodulated laser signal and the spot information to obtain laser far-field parameters.
2. The system of claim 1, wherein the light source modulation assembly comprises: the system comprises a laser to be tested (1) and a GPS synchronous circuit (2) which are in data communication, wherein the GPS synchronous circuit (2) receives GPS satellite time synchronous signals, and the laser to be tested (1) modulates laser according to the GPS satellite signals.
3. The system of claim 1, wherein the reflection detection assembly comprises a diffuse reflection target (3) and a detector (4);
the diffuse reflection target (3) is provided with a through hole, the detector (4) is arranged on the surface, far away from the light source modulation component, of the diffuse reflection target (3), the detector (4) corresponds to the through hole, and the modulated laser reaches the detector (4) through the through hole.
4. A system according to claim 3, characterized in that the data acquisition assembly comprises an image acquisition component (7) and a detector data acquisition component; the light spot information comprises first light spot information and second light spot information;
the image acquisition component (7) acquires first light spot information of the diffuse reflection target (3) and sends the first light spot information to the signal processing component;
and the detector data acquisition component acquires second light spot information of the detector and sends the second light spot information to the signal processing component.
5. A system according to claim 3, characterized in that the demodulation component comprises a high-speed synchronous acquisition circuit (5) and a GPS receiver (6);
the detector (4) converts the received optical signal of the modulated laser light into an electrical signal;
the high-speed synchronous acquisition circuit (5) receives the electric signals and GPS satellite time synchronous signals received by the GPS receiver (6) to demodulate modulated laser, and demodulated laser signals are obtained.
6. The system according to claim 4, wherein the signal processing component comprises a host computer (8), and the host computer (8) receives and analyzes the demodulated laser signal and the spot information to obtain a laser far-field parameter.
7. The system of claim 6, wherein the signal processing component includes a host computer (8), the host computer (8) receives and analyzes the demodulated laser signal and the spot information, and acquiring the laser far-field parameter includes:
establishing a coordinate system by taking the exact center of the diffuse reflection target (3) as an origin, taking the direction of the target surface of the diffuse reflection target (3) perpendicular to the horizontal direction as an X axis and taking the direction of the target surface of the diffuse reflection target (3) perpendicular to the horizontal direction as a Y axis;
the image acquisition component (7) acquires first light spot information of the diffuse reflection target (3) and sends the first light spot information to the signal processing component to acquire light spot center position information;
according to the obtained information of the center of the light spot, the position of the diffuse reflection target (3) is adjusted to enable the center of the light spot to be located at the right center of the diffuse reflection target (3);
when the light spot center is positioned at the right center of the diffuse reflection target (3), respectively acquiring the position information of the information point of the whole light spot in the coordinate system;
and based on the demodulated laser signals, acquiring second light spot information of the detector according to the position of the detector in the diffuse reflection target (3) and the detector data acquisition component, and corresponding the second light spot information to the position information of the information point of the whole light spot in the coordinate system to acquire the laser far field parameters.
8. The system of claim 7, comprising obtaining the information point for the entire spot using the formula:
f (x, y) -T <0, i.e. background, where f (x, y) =0;
f (x, y) -T >0, i.e. the target, then the value of f (x, y) is kept unchanged here;
；
wherein T is the threshold value of the background area and the target area in the laser image, H (z) is the curve function of the gray level histogram of the laser image, the gray level value corresponding to the minimum value point of the curve function is T, and the pixel point larger than T is the information point of the light spot in the image.
9. The system of claim 7, comprising obtaining spot center position information using the formula:
；/>；
wherein x is c Indicating light spotsThe abscissa of the center position, y c The abscissa I (x, y) representing the center position of the spot represents the gray value of the information point at the position (x, y), x represents the abscissa of the information point at the position (x, y), and y represents the ordinate of the information point at the position (x, y).
10. A method of measuring using the laser far field parameter measurement system of any one of claims 1-9, comprising:
modulating laser;
carrying out reflection detection on the modulated laser;
collecting spot information after reflection detection;
demodulating the modulated laser to obtain a demodulated laser signal;
and analyzing and processing the obtained demodulated laser signal and the spot information to obtain the laser far-field parameters.
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| Title |
|---|
| 景永康: "无线光通信远场光斑图像检测实验研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》, 15 January 2021 (2021-01-15), pages 35 - 36 * |
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