CN117629383A - System and method for improving remote laser speckle vibration measurement accuracy - Google Patents
System and method for improving remote laser speckle vibration measurement accuracy Download PDFInfo
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Abstract
The invention provides a system for improving the remote laser speckle vibration measurement precision, which can be applied to the technical field of laser speckle vibration measurement. The system comprises: a laser for emitting a gaussian laser beam; the Fengman laser modulator is used for converting the Gaussian laser beam into a Fengman laser beam so as to enable the Fengman laser beam to generate laser scattering on the surface of a target object to obtain scattered laser; the band-pass filter is used for retaining a light beam with a preset laser frequency in the scattered laser; the CCD imaging sensor is used for receiving the light beam with the preset laser frequency and forming a laser speckle pattern; and the data processing device is used for calculating the micro-vibration information of the target object according to the laser speckle pattern. The invention also provides a method for improving the precision of the vibration measurement of the remote laser speckle, which can effectively reduce the noise of the laser speckle and improve the precision of the vibration measurement of the remote laser speckle.
Description
Technical Field
The invention relates to the field of laser speckle vibration measurement, in particular to a system and a method for improving the accuracy of remote laser speckle vibration measurement.
Background
As the method for measuring micro vibration and micro displacement by laser speckle has the characteristics of high sensitivity, quick response, non-contact, portability and the like, the method is widely applied to the fields of building health monitoring, disease detection, disaster search and rescue and the like in recent years.
However, when the measured object is far away from the laser beam, the laser speckle forming process is interfered by environmental factors such as the atmosphere, so that the speckle noise is increased, the micro-vibration detection precision is greatly reduced, and the anti-interference capability is not strong. Therefore, the traditional laser speckle vibration measurement technology is difficult to realize remote detection, and particularly effective measurement of kilometer-level laser speckle micro vibration signals is difficult.
Disclosure of Invention
In view of the above problems, the invention provides a system and a method for improving the precision of remote laser speckle vibration measurement, which can effectively reduce laser speckle noise and improve the precision of remote laser speckle vibration measurement.
According to a first aspect of the present invention there is provided a system for improving the accuracy of remote laser speckle vibration measurement, the measurement system comprising:
a laser for emitting a gaussian laser beam;
the Fengman laser modulator is used for converting the Gaussian laser beam into a Fengman laser beam so that the Fengman laser beam is subjected to laser scattering on the surface of a target object to obtain scattered laser;
the band-pass filter is used for retaining a light beam with a preset laser frequency in the scattered laser;
the CCD imaging sensor is used for receiving the light beam with the preset laser frequency and forming a laser speckle pattern;
and the data processing device is used for calculating the micro-vibration information of the target object according to the laser speckle pattern.
In an embodiment, the measurement system further comprises:
the optical lens is arranged between the band-pass filter and the CCD imaging sensor and is used for converging the light beam with the preset laser frequency.
In an embodiment, the measurement system further comprises:
the laser beam expander is arranged between the laser and the Fengman laser modulator and is used for adjusting the diameter of the Gaussian laser beam.
In an embodiment, the distance magnitude between the enhanced remote laser speckle vibration measurement accuracy system and the target object comprises a kilometer magnitude.
In one embodiment, the gaussian laser beam is a monochromatic gaussian laser beam.
In one embodiment, the centroid position of the laser speckle pattern is:
wherein X is c For the centroid position of the laser speckle pattern in the horizontal direction, Y c Respectively the barycenter position, x of the laser speckle pattern in the vertical direction mn ，y mn Representing the horizontal and vertical position coordinates, I, of the pixel at point (m, n), respectively mn Representing the pixel value size at point (m, n).
In an embodiment, the calculating the micro-vibration information of the target object according to the laser speckle pattern includes:
and calculating the micro-vibration information of the target object by using an adjacent frame centroid algorithm according to the laser speckle pattern.
A second aspect of the present invention provides a method of improving the accuracy of remote laser speckle vibration measurement, the method comprising:
emitting a gaussian laser beam by a laser;
converting the Gaussian laser beam into a Fengman laser beam through a Fengman laser modulator so that the Fengman laser beam is subjected to laser scattering on the surface of a target object to obtain scattered laser;
a band-pass filter is used for retaining a light beam with a preset laser frequency in the scattered laser;
receiving the light beam with the preset laser frequency through a CCD imaging sensor to form a laser speckle pattern;
and calculating the micro-vibration information of the target object according to the laser speckle pattern.
In an embodiment, the method further comprises:
and converging the light beam with the preset laser frequency through an optical lens arranged between the band-pass filter and the CCD imaging sensor.
In an embodiment, the method further comprises:
the diameter of the Gaussian laser beam is adjusted through a laser beam expander arranged between the laser and the Fengman laser modulator.
The invention provides a system and a method for improving remote laser speckle vibration measurement precision, which are characterized in that Gaussian laser beams are emitted by a laser, the Gaussian laser beams are converted into Fengman laser beams by a Fengman laser modulator, so that the Fengman laser beams are subjected to laser scattering on the surface of a target object to obtain scattered laser, the light beams with preset laser frequency in the scattered laser are reserved by a band-pass filter, the light beams with the preset laser frequency are received by a CCD imaging sensor to form laser speckle patterns, and the micro vibration information of the target object is calculated according to the laser speckle patterns. The laser speckle noise can be effectively reduced, and the precision of remote laser speckle vibration measurement is improved.
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The foregoing and other objects, features and advantages of the invention will be apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic diagram of a system for improving accuracy of remote laser speckle vibration measurement in accordance with an embodiment of the invention;
FIG. 2 schematically illustrates a schematic diagram of another system for improving accuracy of remote laser speckle vibration measurement in accordance with an embodiment of the invention;
FIG. 3 schematically illustrates a schematic diagram of a laser speckle pattern acquired by a CCD image sensor according to an embodiment of the invention;
FIG. 4 schematically illustrates a diagram of centroid shift results for adjacent frames of a continuous 2400 frame laser speckle pattern in accordance with an embodiment of the invention;
fig. 5 schematically shows a flow chart of a method for improving the accuracy of remote laser speckle vibration measurement according to an embodiment of the invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described 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 the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Where expressions like at least one of "A, B and C, etc. are used, the expressions should generally be interpreted in accordance with the meaning as commonly understood by those skilled in the art (e.g.," a system having at least one of A, B and C "shall include, but not be limited to, a system having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
FIG. 1 schematically illustrates a schematic diagram of a system for improving accuracy of remote laser speckle vibration measurement in accordance with an embodiment of the invention.
As shown in fig. 1, the system for improving the accuracy of measuring the long-distance laser speckle vibration of this embodiment includes a laser 1, a front-man laser modulator 3, a band-pass filter 5, a CCD imaging sensor 7, and a data processing device, which is not shown. A laser 1 for emitting a gaussian laser beam; the Fengman laser modulator 3 is used for converting the Gaussian laser beam into a Fengman laser beam so as to enable the Fengman laser beam to generate laser scattering on the surface of the target object 4 to obtain scattered laser; a band-pass filter 5 for retaining a light beam having a preset laser frequency among the scattered laser light; a CCD imaging sensor 7 for receiving the light beam with the preset laser frequency to form a laser speckle pattern; and the data processing device is used for calculating the micro-vibration information of the target object 4 according to the laser speckle pattern.
FIG. 2 schematically illustrates another system for improving accuracy of remote laser speckle vibration measurement in accordance with an embodiment of the invention.
As shown in fig. 2, the system for improving the accuracy of measuring the long-distance laser speckle vibration of this embodiment includes a laser 1, a laser beam expander 2, a front laser modulator 3, a band-pass filter 5, an optical lens 6, a CCD imaging sensor 7, and a data processing device, which is not shown. A laser 1 for emitting a gaussian laser beam; a laser beam expander 2 for adjusting the diameter of the gaussian laser beam; the Fengman laser modulator 3 is used for converting the Gaussian laser beam into a Fengman laser beam so as to enable the Fengman laser beam to generate laser scattering on the surface of the target object 4 to obtain scattered laser; a band-pass filter 5 for retaining a light beam having a preset laser frequency among the scattered laser light; an optical lens 6 for converging the light beam having the preset laser frequency; a CCD imaging sensor 7 for receiving the light beam with the preset laser frequency to form a laser speckle pattern; and the data processing device is used for calculating the micro-vibration information of the target object 4 according to the laser speckle pattern.
The laser beam expander 2 may employ two optical lenses of specific focal lengths as long as the diameter of the gaussian laser beam can be adjusted.
In one embodiment, the magnitude of the distance between the front laser modulator and the target object 4 comprises kilometers. The Gaussian laser beam forms a stably transmitted Fengman laser beam after passing through the Fengman laser modulator 3, and the laser beam has good atmospheric environment disturbance resistance, can effectively inhibit laser speckle jitter and intensity fluctuation, and realizes kilometer-level stable transmission.
In one embodiment, the gaussian laser beam is a monochromatic gaussian laser beam.
In one embodiment, the calculating the micro-vibration information of the target object according to the laser speckle pattern includes: and calculating the micro-vibration information of the target object by using an adjacent frame centroid algorithm according to the laser speckle pattern. Further, centroid algorithms or other image registration algorithms may be employed, as this disclosure is not limited in this regard.
In one embodiment, the centroid position of the laser speckle pattern is:
wherein X is c For the centroid position of the laser speckle pattern in the horizontal direction, Y c Respectively the barycenter position, x of the laser speckle pattern in the vertical direction mn ，y mn Respectively representing the pixel position coordinates at the point (m, n), I mn Representing the pixel size at point (m, n).
The offset between the ith and i+1 frames of the centroid of the laser speckle pattern can be obtained by utilizing the centroid position change of the adjacent laser speckle pattern:
fig. 3 schematically shows a schematic diagram of a laser speckle pattern acquired by a CCD image sensor according to an embodiment of the invention. Fig. 3 shows laser speckle patterns formed by gaussian beams and frontal-miscanthus beams collected by a CCD image sensor. Compared with the speckle formed by Gaussian beams, the speckle jitter and intensity fluctuation of the frontal-miscanthus beam are small, the atmospheric environment disturbance resistance is stronger, and the environmental noise is smaller. The Fengman laser beam has proved the stability of kilometer-level transmission in experiments, and provides powerful support for kilometer-level laser speckle micro-vibration measurement.
Fig. 4 schematically illustrates a diagram of centroid shift results for adjacent frames of a continuous 2400 frame laser speckle pattern in accordance with an embodiment of the invention. As shown in fig. 4, centroid offset results of adjacent frames of laser speckle of 2400 frames are shown, and micro-vibration signals generated by the steps of 4 people occur together, and the signal-to-noise ratio is high. And then according to the optical imaging principle, the displacement of the target micro-vibration at a remote position can be calculated.
Fig. 5 schematically shows a flow chart of a method for improving accuracy of remote laser speckle vibration measurement according to an embodiment of the invention, the method comprising operations S1 to S5.
In operation S1, a gaussian laser beam is emitted by a laser.
In operation S2, the gaussian laser beam is converted into a frontal-miscanthus laser beam by a frontal-miscanthus laser modulator, so that the frontal-miscanthus laser beam is subjected to laser scattering on the surface of the target object, and scattered laser is obtained.
In operation S3, a beam having a preset laser frequency among the scattered laser light is retained by a band pass filter.
In operation S4, the beam having the preset laser frequency is received by the CCD imaging sensor to form a laser speckle pattern.
In operation S5, micro-vibration information of the target object is calculated according to the laser speckle pattern.
In one embodiment, the method of fig. 5 further comprises: the light beam having the preset laser frequency is converged by an optical lens disposed between the band-pass filter and the CCD imaging sensor.
In one embodiment, the method of fig. 5 further comprises: the diameter of the Gaussian laser beam is adjusted by a laser beam expander arranged between the laser and the Fengman laser modulator.
It will be appreciated that the method for improving the accuracy of measuring the remote laser speckle vibration described above may be applied to the system for improving the accuracy of measuring the remote laser speckle vibration shown in fig. 1 or fig. 2.
Those skilled in the art will appreciate that the features recited in the various embodiments of the invention can be combined and/or combined in a variety of ways, even if such combinations or combinations are not explicitly recited in the present invention. In particular, the features recited in the various embodiments of the invention can be combined and/or combined in various ways without departing from the spirit and teachings of the invention. All such combinations and/or combinations fall within the scope of the invention.
It should be noted that, for the sake of simplicity of description, the foregoing method embodiments are all expressed as a series of combinations of actions, but it should be understood by those skilled in the art that the present invention is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily all required for the present invention.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
The embodiments of the present invention are described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination. 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.
Claims (10)
1. A system for improving the accuracy of remote laser speckle vibration measurement, the system comprising:
a laser for emitting a gaussian laser beam;
the Fengman laser modulator is used for converting the Gaussian laser beam into a Fengman laser beam so that the Fengman laser beam is subjected to laser scattering on the surface of a target object to obtain scattered laser;
the band-pass filter is used for retaining a light beam with a preset laser frequency in the scattered laser;
the CCD imaging sensor is used for receiving the light beam with the preset laser frequency and forming a laser speckle pattern;
and the data processing device is used for calculating the micro-vibration information of the target object according to the laser speckle pattern.
2. The enhanced remote laser speckle vibration measurement accuracy system of claim 1, wherein the measurement system further comprises:
the optical lens is arranged between the band-pass filter and the CCD imaging sensor and is used for converging the light beam with the preset laser frequency.
3. The enhanced remote laser speckle vibration measurement accuracy system of claim 1, wherein the measurement system further comprises:
the laser beam expander is arranged between the laser and the Fengman laser modulator and is used for adjusting the diameter of the Gaussian laser beam.
4. The enhanced remote laser speckle vibration measurement accuracy system of claim 1, wherein a distance magnitude between the enhanced remote laser speckle vibration measurement accuracy system and the target object comprises a kilometer magnitude.
5. The system for improving the accuracy of remote laser speckle vibration measurement of claim 1, wherein the gaussian laser beam is a monochromatic gaussian laser beam.
6. The system for improving the accuracy of measuring the vibration of a remote laser speckle pattern according to claim 1, wherein the centroid position of the laser speckle pattern is:
wherein X is c For the centroid position of the laser speckle pattern in the horizontal direction, Y c Respectively the barycenter position, x of the laser speckle pattern in the vertical direction mn ，y mn Representing the horizontal and vertical position coordinates, I, of the pixel at point (m, n), respectively mn Representing the pixel value at point (m, n).
7. The system for improving remote laser speckle vibration measurement accuracy of claim 1 or 6, wherein said calculating the micro-vibration information of the target object from the laser speckle pattern comprises:
and calculating the micro-vibration information of the target object by using an adjacent frame centroid algorithm according to the laser speckle pattern.
8. A method for improving the accuracy of remote laser speckle vibration measurement, the method comprising:
emitting a gaussian laser beam by a laser;
converting the Gaussian laser beam into a Fengman laser beam through a Fengman laser modulator so that the Fengman laser beam is subjected to laser scattering on the surface of a target object to obtain scattered laser;
a band-pass filter is used for retaining a light beam with a preset laser frequency in the scattered laser;
receiving the light beam with the preset laser frequency through a CCD imaging sensor to form a laser speckle pattern;
and calculating the micro-vibration information of the target object according to the laser speckle pattern.
9. The method for improving the accuracy of remote laser speckle vibration measurement of claim 8, further comprising:
and converging the light beam with the preset laser frequency through an optical lens arranged between the band-pass filter and the CCD imaging sensor.
10. The method for improving the accuracy of remote laser speckle vibration measurement of claim 8, further comprising:
the diameter of the Gaussian laser beam is adjusted through a laser beam expander arranged between the laser and the Fengman laser modulator.
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| CN202311345634.6A CN117629383A (en) | 2023-10-17 | 2023-10-17 | System and method for improving remote laser speckle vibration measurement accuracy |
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| CN202311345634.6A CN117629383A (en) | 2023-10-17 | 2023-10-17 | System and method for improving remote laser speckle vibration measurement accuracy |
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