CN111913164A - Laser detection system and detection method thereof - Google Patents
Laser detection system and detection method thereof Download PDFInfo
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- CN111913164A CN111913164A CN201910378824.5A CN201910378824A CN111913164A CN 111913164 A CN111913164 A CN 111913164A CN 201910378824 A CN201910378824 A CN 201910378824A CN 111913164 A CN111913164 A CN 111913164A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
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Abstract
The invention discloses a laser detection system and a detection method thereof, wherein the laser detection system comprises a detection module and a feedback module, wherein the detection module comprises a laser generation unit and a dispersion element, wherein the laser generation unit emits a detection beam, the probe beam is capable of reaching the dispersive element, the dispersive element disperses the probe beam, the probe beam passing through the dispersive element is capable of reaching the target region, and forms a reflected beam, the feedback module and the detection module are independent from each other, the reflected beam from the target area can reach the feedback module, and the feedback module only receives the reflected light beam, so that the interference of the detection light beam on the reflected light beam is avoided, and the accuracy of detection by using the laser detection system is further improved.
Description
Technical Field
The present invention relates to a detection system, and more particularly, to a laser detection system and a detection method thereof.
Background
The solid-state laser radar has the characteristics of high data acquisition speed, high resolution, strong adaptability to temperature change and vibration and the like, has a small structure, low cost, high reliability and good controllability, is easy to install, gradually replaces a mechanical laser radar, is widely applied to the field of automobiles, and becomes one of core devices for realizing automatic driving and intelligent auxiliary driving systems.
The existing commonly used laser radars are generally solid-state laser radar phased array laser radar, 3Dflash laser radar, and hybrid solid-state laser radar MEMS (Micro-Electro-Mechanical System) laser radar. The solid-state laser radar realized by the phased array principle adopts a phased array device, changes the emitting angle of laser by adjusting the phase difference of each laser generating unit in an emitting array, and controls the phase of the laser generating unit through an electric signal so as to control a laser beam to carry out pointing scanning on a target object. The solid-state laser radar based on the 3Dflash principle directly transmits area array laser to a target object, and receives the laser by using a high-sensitivity receiver so as to obtain a surrounding point cloud image. The MEMS principle-based hybrid solid-state laser radar changes the change of the emission angle of a single laser generating unit by utilizing the deflection of the MEMS galvanometer so as to realize the directional deflection of laser and further complete the graphic scanning of a target object.
However, the existing solid-state laser radar still has a lot of problems in the actual use process. Firstly, the rotation angle of the solid-state laser radar is limited, and comprehensive coverage detection is difficult to realize, and generally, the detection range can be increased only by arranging a plurality of solid-state laser radars at different positions, so that the use cost is increased, and the utilization rate of the solid-state laser radar is reduced. Secondly, the laser beam reflected by the target object and received by the receiver of the existing solid-state laser radar and the laser beam emitted by the laser generating unit share the same light path, namely the light path is the same, so that mutual interference between the laser beam emitted by the laser generating unit and the laser beam emitted by the target object is easily caused, the detection precision of the existing solid-state laser radar is further influenced, and the safety performance of an automatic driving system and an intelligent assistant driving system which use the existing solid-state laser radar is reduced.
Disclosure of Invention
An object of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system detects a target object in a target area in a manner of fully covering the target area, thereby improving detection efficiency and accuracy of the laser detection system.
Another object of the present invention is to provide a laser detection system and a detection method thereof, wherein the optical paths of a reflected light beam received by the laser detection system from the target object and a detection light beam emitted by a laser generating unit of the laser detection system are different, in this way, the detection light beam is prevented from interfering with the reflected light beam, which is beneficial to improving the accuracy and reliability of the laser detection system.
Another object of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system can disperse the detection beam and make the detection beam cover the target area, so as to improve the detection efficiency and the detection accuracy of the laser detection system.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system includes a detection module, wherein the detection module disperses the detection beams with different wavelengths to the target areas with different angles by a dispersion element to achieve detection of the target object in the target area.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system includes a laser generation unit, the laser generation unit outputs a pulse detection beam with a certain spectral width, and different field scanning angles can be realized by changing the spectral width of the detection beam output by the laser generation unit, thereby improving the flexibility of the laser detection system.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the pulse wavelength of the detection beam varies periodically with time, which is beneficial to realize different field scanning angles, thereby expanding the scanning range of the laser detection system.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser generation unit outputs a pulse detection beam having a certain spectral width, and a single pulse of the laser generation unit includes detection light with multiple wavelengths, and the intensity consistency of the detection beam of different spectra in the single pulse is better than 75%, which ensures the quality of the detection beam and is further beneficial to improving the accuracy of the laser detection system.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the detection module of the laser detection system includes a collimating element, wherein the collimating element is held at one side of the laser generating unit, and the detection beam is collimated by the collimating element, so as to improve the quality of the detection beam.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system includes an optical receiving unit, the optical receiving unit and the laser generating unit are independent from each other, and the reflected light from the target object in the target area is received by the optical receiving unit, so as to prevent the detection light beam output by the laser generating unit from interfering with the reflected light, thereby ensuring the accuracy of the detection result.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the optical receiving unit includes a dispersion element and a receiving lens set, the reflected light beam passes through the dispersion element to form a parallel light beam, and the parallel reflected light beam is converged at a point after passing through the receiving element, so as to improve the quality of the reflected light beam and further ensure the reliability of the laser detection system.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system includes two angle magnifiers, and the angle magnifiers are used to realize large-angle scanning, so as to improve the scanning efficiency of the laser detection system.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system includes a detector, wherein the detector receives the reflected light beam after passing through the optical receiving unit and can convert an optical signal into an electrical signal so as to subsequently acquire information of the target object in the target area.
Another object of the present invention is to provide a laser detection system and a detection method thereof, wherein the laser detection system includes a processing module, wherein the processing module is communicatively connected to the detector and receives the electrical signal generated by the detector, so as to obtain the information of the target object in the target area according to the electrical signal.
Another objective of the present invention is to provide a laser detection system and a detection method thereof, wherein the processing module of the laser detection system is communicably connected to the laser generating unit, and the processing module can control the information of the detection beam generated by the laser generating unit to flexibly monitor the change in the target area.
According to an aspect of the present invention, there is further provided a laser detection system adapted to detect a target area, the laser detection system comprising:
a detection module, wherein the detection module comprises a laser generation unit and a dispersion element, wherein the laser generation unit emits a detection beam, the detection beam can reach the dispersion element, the dispersion element disperses the detection beam, the detection beam passing through the dispersion element can reach the target area, and a reflected beam is formed; and
a feedback module, wherein the feedback module is independent of the detection module, the reflected beam from within the target area is able to reach the feedback module, and the feedback module receives only the reflected beam.
According to an embodiment of the present invention, the detection module includes a collimating element, wherein the collimating element is held between the laser generating unit and the dispersing element, and the detection beam generated by the laser generating unit reaches the dispersing element after passing through the collimating element.
According to an embodiment of the present invention, the feedback module further comprises an optical receiving unit and a detector, wherein the reflected light beam passing through the optical receiving unit can reach the detector and be converted into an electrical signal by the detector.
According to an embodiment of the invention, the laser detection system further comprises a processing module, wherein the processing module is communicatively connected to the detector.
According to an embodiment of the invention, the processing module is communicatively connected to the laser generation unit of the detection module.
According to one embodiment of the present invention, the optical receiving unit includes a dispersive element and a receiving lens set, wherein the receiving lens set is held between the dispersive element and the detector, respectively.
According to one embodiment of the invention, the detector is a single point detector.
According to one embodiment of the invention, the detector is a small area array detector.
According to one embodiment of the present invention, the optical receiving unit is an imaging lens.
According to one embodiment of the invention, the detector is an area array detector.
According to one embodiment of the present invention, the laser generating unit is a broad spectrum pulsed light source.
According to one embodiment of the present invention, the probe beam generated by the laser generating unit is periodically varied.
According to one embodiment of the invention, a single pulse of the laser generation unit contains multiple wavelengths of the probe beam.
According to one embodiment of the invention, the uniformity of the light intensity of the probe light beams of different spectra within a single pulse of the laser generating unit is greater than 75%.
According to an embodiment of the present invention, the laser detection system further includes two angle magnifier, one of the angle magnifier is correspondingly held on one side of the dispersive element of the detection module, the detection light beam passing through the dispersive element can reach the angle magnifier, the other angle magnifier is correspondingly held on one side of the feedback module, and the reflected light beam can reach the feedback module after passing through the angle magnifier.
According to one embodiment of the invention, the dispersive element is a two-dimensional dispersive device.
According to another aspect of the present invention, the present invention further provides a detection method of a laser detection system, the detection method comprising the steps of:
(a) generating a probe beam by a laser generating unit;
(b) dispersing the probe beam by a dispersion element;
(c) forming a reflected light beam after the detection light beam reaches a target area; and
(d) the reflected beam is received by a feedback module independent of the detection module.
According to an embodiment of the present invention, in the step (a), the wavelength of the laser pulse generated by the laser generation unit to the probe beam is periodically changed with time.
According to an embodiment of the present invention, in the step (a), a single pulse of the laser generating unit includes the probe beams of a plurality of wavelengths.
According to an embodiment of the present invention, the step (a) is further followed by the steps of: the probe beam is collimated.
According to an embodiment of the present invention, the step (d) further comprises the steps of:
(d.1) parallelizing the reflected beam by a dispersive element of an optical receiving unit of the feedback module; and
(d.2) converging the reflected light beam by a receiving lens set of the light receiving unit.
According to one embodiment of the invention, the reflected beam is received by the detector after passing through an imaging lens.
According to an embodiment of the present invention, after the step (b), further comprising the steps of: the deflection angle of the probe beam after passing through the dispersion element is amplified by an angle magnifier, and the reflected beam is received by another angle magnifier.
Drawings
FIG. 1A is a schematic diagram of a laser detection system according to a preferred embodiment of the present invention.
FIG. 1B is a schematic diagram of the laser detection system according to the above preferred embodiment of the present invention.
Fig. 1C is a schematic diagram of a light source spectrum of a laser generating unit of the laser detection system according to the above preferred embodiment of the invention.
FIG. 2 is a schematic diagram of the laser detection system according to another preferred embodiment of the present invention.
FIG. 3A is a schematic diagram of the laser detection system according to another preferred embodiment of the present invention.
Fig. 3B is a schematic diagram of a spectrum diagram of the laser generating unit of the laser detection system according to the above preferred embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Referring to fig. 1A to 1C, a laser detection system 100 according to a preferred embodiment of the present invention will be described in the following description, wherein the laser detection system 100 detects the condition in a target area 200 in a manner of fully covering the target area 200, and can accurately obtain information of a target object in the target area 200, thereby improving the detection efficiency of the laser detection system 100. In addition, the laser detection system 100 detects the target area 200 by a detection beam 101, and obtains information of the target object in the target area 200 by receiving a reflected beam from the target object in the target area 200, and the detection beam 101 and the reflected beam 102 are non-common optical paths, so that interference of the detection beam 101 on the reflected beam 102 is avoided, and accuracy of detection by the laser detection system 100 is improved.
The laser detection system 100 can be applied to the field of vehicles, for example, but not limited to, the laser detection system 100 is applied to an automatic driving system and an intelligent driving assistance system, which is beneficial to improving the safety and stability of the automatic driving system and the intelligent driving assistance system. It is worth mentioning that those skilled in the art should understand that the specific application of the laser detection system 100 is merely an example, and the laser detection system 100 can be applied to other fields.
Referring to fig. 1A, fig. 2 and fig. 3A, the laser detection system 100 includes a detection module 10 and a feedback module 20, wherein the detection module 10 generates the detection beam 101 and fully covers the target area 200 by dispersing the detection beam 101 to fully detect the target area 200, and subsequently, the feedback module 20 receives the reflected beam 102 from the target object in the target area 200, and then obtains the status of the target area 200 by analyzing and processing the information carried by the reflected beam 102. Further, the detection module 10 and the feedback module 20 of the laser detection system 100 are independent from each other, and the detection beam 101 generated by the detection module 10 and the reflected beam 102 received by the feedback module 20 are independent from each other, that is, the optical paths of the detection beam 101 and the reflected beam 102 are different from each other, in this way, the mutual interference between the detection beam 101 and the reflected beam 102 is avoided, which is beneficial to improving the accuracy of the detection result of the laser detection system 100.
The detection module 10 of the laser detection system 100 includes a laser generation unit 11, wherein the laser generation unit 11 is capable of generating the probe beam 101 to subsequently scan the target area 200 with the probe beam 101 to monitor the target object in the target area 200.
Further, the detection module 10 of the laser detection system 100 includes a dispersion element 12, wherein the dispersion element 12 is held at one side of the laser generation unit 11, the detection beam 101 generated by the laser generation unit 11 can reach the dispersion element 12, and the dispersion element disperses the composite detection beam 101 into a plurality of detection beams 101 with different wavelengths, and detection angles of the detection beams 101 with different wavelengths are different, so that the target area 200 is scanned by the plurality of detection beams 101 to improve a detection range of the laser detection system 100, thereby improving detection efficiency of the laser detection system 100.
Due to the influences of different refractive indexes and different propagation speeds of the probe beams 101 with different wavelengths in the same medium, after passing through the dispersion element 12, the propagation directions of the probe beams 101 with different wavelengths are deflected, so that the probe beams 101 are respectively dispersed and have different scanning angles, and the detection range of the laser detection system 100 is expanded by expanding the scanning field of view of the probe beams 101 through the dispersion element 12. For example, when the spectrum of the probe beam 101 generated by the laser generating unit 11 of the laser detection system 100 is 40nm, a 20 ° field scan can be generally achieved. It should be understood that the spectral width and the scan field of view generated by the laser generation unit 11 are merely illustrative and should not be construed as limiting the content and scope of the laser detection system 100 of the present invention.
It is worth mentioning that the type of the dispersive element 12 of the detection module 10 is not limited, and preferably, the dispersive element 12 is a two-dimensional dispersive device. For example, but not limited to, the dispersive element 12 may be implemented as a prism, a grating, etc., and those skilled in the art will appreciate that the specific embodiment of the dispersive element 12 is merely exemplary and should not be construed as limiting the scope and content of the laser detection system 100 of the present invention.
Referring to fig. 1B and 1C, according to a preferred embodiment of the present invention, the laser generating unit 11 of the laser detecting system 100 is a broad spectrum pulse light source. Preferably, the probe beam 101 is output with a periodically varying spectrum. Preferably, the pulse frequency output by the laser generating unit 11 is 50KHz, the pulse width is greater than 10ns, and the wavelength of the laser pulse changes periodically with time. Preferably, the spectral range of the probe beam 101 generated by the laser generating unit 11 is between 885nm and 935 nm.
Referring to fig. 1B and 1C, for example, the light source spectrum and intensity of the laser generating unit 11 are distributed according to fig. 1C, that is, the wavelength λ of the probe light beam 101 is periodically changed according to the regularity of λ (1,1), λ (1,2) … … λ (1, n), λ (2,1), λ (2,2) … … λ (2, n) … … λ (m, n), λ (1,1), λ (1,2) … … λ (1,2), λ (2,1), λ (2,2) … … λ (m, n). After the probe beam 101 passes through the dispersion element 12, the probe beam 101 with different wavelengths is directed to the target area 200 with different angles, so as to detect the target area 200. Specifically, the probe light beam 101 having wavelengths λ (1,1), λ (1,2) … … λ (1, n) scans the target region in a first line, the probe light beam 101 having wavelengths λ (2,1), λ (2,2) … … λ (2, n) scans the target region in a second line, and so on, λ (m,1), λ (m, 2) … … λ (m, n) scans the target region in an mth line, thereby completely covering the target region 200 in such a manner as to accurately detect the target region 200.
Referring to fig. 3A and 3B, according to a preferred embodiment of the present invention, the laser generating unit 11 of the laser detecting system 100 can output the detecting beam 101 with a certain spectral width, and after passing through the dispersing element 12, the propagation directions of the detecting beams 101 with different wavelengths are deflected, so that the detecting beams 101 are respectively dispersed and directed to the target areas 200 with different angles. Preferably, the laser generating unit 11 is a broad spectrum pulse light source, and a single pulse of the laser generating unit 11 contains the probe beam 101 with multiple wavelengths. Preferably, the spectral range of the probe beam 101 generated by the laser generating unit 11 is between 890nm and 930 nm. Preferably, within a single pulse, the light intensity of the probe light beams of different spectra is more than 75% consistent, so as to ensure the quality of the probe light beam 101, and to facilitate the accuracy of the laser detection system 100 in detecting the target region 200.
Referring to fig. 3A and 3B, for example, the laser generating unit 11 is a broad spectrum pulse light source, the single pulse of the laser generating unit 11 includes the probe light beam 101 with multiple wavelengths, the light source spectrum, intensity and time relationship of the laser generating unit 11 are distributed according to fig. 3B, that is, the wavelengths λ of the probe light beam 101 are distributed according to the regular distribution of λ (1,1), λ (1,2) … … λ (m, n), λ (1,1), λ (1,2) … … λ (m, n), λ (1,1), λ (1,2) … … λ (m, n), when the probe light beam 101 passes through the dispersing element 12, the propagation directions of the probe light beam 101 with different wavelengths are deflected, so that the probe light beam 101 is directed to the target regions 200 with different angles according to λ (1,1), λ (1,2) … … λ (m, n), the detection of the target area 200 is then completed in a manner covering the target area 200.
Referring to fig. 1A, fig. 2 and fig. 3A, the detection module 10 of the laser detection system 100 further includes a collimating element 13, where the collimating element 13 is held between the laser generating unit 11 and the dispersing element 12 of the detection module 10, the detection beam 101 generated by the laser generating unit 11 can reach the collimating element 13, and the collimating element 13 collimates the detection beam 101 to obtain a parallel beam with a higher collimation degree, which is favorable for improving the quality of the detection beam 101, and further ensures the accuracy of the laser detection system 100 in detecting the target region 200.
Preferably, the collimating element 13 is implemented as an optical lens group, such as, but not limited to, the collimating element 13 is implemented as an optical lens group consisting of at least one aspheric lens and at least one spherical lens; or the collimating element 13 is an optical lens group composed of aspheric lenses. Preferably, the collimating element 13 is an aspheric lens. It should be understood by those skilled in the art that the type of the collimating element 13 is not limited, and the specific embodiment of the collimating element 13 is only an example and should not be construed as limiting the content and scope of the laser detection system 100 of the present invention. Preferably, the collimation of the probe beam 101 passing through the collimating element 13 is better than 0.1 °.
Referring to fig. 1A and 1B, the feedback module 20 of the laser detection system 100 includes an optical receiving unit 21 and a detector 22, the detection laser 101 emitted by the laser generating unit 11 of the detection module 100 reaches the target region 200, and forms the reflected light beam 102 after being reflected by the target object in the target region 200, wherein the optical receiving unit 21 only receives the reflected light beam 102, and the reflected light beam 102 passing through the optical receiving unit 21 can reach the detector 22. The detector 22 receives the reflected beam 102 and converts the reflected beam 102 into an electrical signal to facilitate subsequent acquisition of information about the target object within the target area 200 based on the electrical signal.
Referring to fig. 1B, according to a preferred embodiment of the present invention, the optical receiving unit 21 includes a dispersive element 12 and a receiving lens set 211, wherein the dispersive element 12 faces the target area 200, the receiving lens set 211 is correspondingly disposed between the dispersive element 12 and the detector 22, and the reflected light beam 102 from the target object in the target area 200 forms a parallel light beam after passing through the dispersive element 12, so as to ensure the beam quality of the reflected light beam 102 and thus the accuracy of the detection result of the laser detection system 100. Further, the parallel reflected light beam 102 can be converged to a point after passing through the receiving lens set 211. Further, the reflected light beam 102 after passing through the receiving lens set 211 of the optical receiving unit 21 is converged at the detector 22, so that the detector 22 can completely receive the reflected light beam 102, and thus information of the target object in the target area 200 can be obtained more accurately.
Preferably, when the optical receiving unit 21 is implemented as being constituted by the dispersive element 12 and the receiving element 211, the detector 22 is implemented as a single point detector or a small area detector, such as, but not limited to, an avalanche photodiode.
Referring to fig. 3A, the optical receiving unit 21 is an imaging lens 210, wherein a light inlet of the imaging lens 210 faces the target area 200, and the imaging lens 210 is correspondingly held on one side of the detector 22. The reflected light beam 102 formed by the object in the target region 200 enters the light inlet from the light incident surface and enters the imaging lens 210, and the reflected light beam 102 passing through the imaging lens 210 is imaged on the detector 22. Further, the detector 22 receives the reflected light beam 102 received by the imaging lens 210, and converts the reflected light beam 102 into the electrical signal, so as to obtain information of the target object in the target area 200 according to the electrical signal.
Preferably, when the optical receiving unit 21 is implemented as the imaging lens 210, the detector 22 is implemented as an area array detector.
It should be noted that those skilled in the art should understand that the specific embodiment of the detector 22 of the feedback module 20 is only an example and should not be construed as limiting the content and scope of the laser detection system 100 of the present invention.
Referring to fig. 1A, fig. 2 and fig. 3A, the laser detection system 100 further includes a processing module 30, wherein the processing module is communicatively connected to the detector 22 of the feedback module 20, and the processing module 30 receives the electrical signal generated by the detector 22 and analyzes the electrical signal, so as to obtain the condition of the target object in the target area according to the information carried by the electrical signal.
According to a preferred embodiment of the present invention, the spectral width of the probe beam 101 generated by the laser generating unit 11 of the probe module 10 is allowed to be adjusted, so that the scanning field angle of the laser detection system 100 can be changed by changing parameters such as the wavelength of the probe beam 101, so as to be suitable for detecting different target areas 200, thereby increasing the flexibility and applicability of the laser detection system 100.
Specifically, referring to fig. 1A, fig. 2 and fig. 3A, the processing module 30 of the laser detection system 100 is communicably connected to the laser generating unit 11 of the detection module 10, and the processing module 30 can adjust parameter information of the laser generating unit 11, so as to adjust a spectral width of the probe beam 101 generated by the laser generating unit 11, so as to cover the target area 200 in all directions by implementing different-angle scanning on the target area, thereby improving accuracy of detection results.
Referring to fig. 2, according to a preferred embodiment of the present invention, the laser detection system 100 further includes two angle magnifiers 40, by means of the angle magnifiers 40, the scanning field of view of the laser detection system 100 can be enlarged, so as to improve the detection efficiency.
Specifically, one of the angle magnifier 40 is held on one side of the dispersive element 12 of the detection module 10, the probe light beam 101 passing through the dispersive element 12 can reach the angle magnifier 40, and the angle magnifier 40 can enlarge the deflection angle of the probe light beam 101 to enlarge the scanning field of view of the laser detection system 100. The other angle magnifier 40 is correspondingly disposed at one side of the optical receiving unit 21 of the feedback module 20, and is held between the optical receiving unit 21 and the target area 200, and the reflected light beam 102 from the target area 200 can reach the optical receiving unit 21 after passing through the angle magnifier 40, and is converged by the optical receiving unit 21.
According to another aspect of the present invention, the present invention further provides a detection method of the laser detection system 100, wherein the detection method comprises the following steps:
(a) the laser generating unit 11 of the detection module 10 generates the detection beam 101;
(b) the dispersive element 12 of the detection module 10 disperses the probe beam 101;
(c) the probe beam 101 reaches the target region 200 to form a reflected beam 102; and (d) receiving the reflected beam 102 by the feedback module 20 independently of the detection module 10.
Preferably, in the step (a), the laser generating unit 11 generates the laser pulses of the probe beam 101 with a wavelength that varies periodically with time.
Preferably, in the step (a), a single pulse of the laser generating unit 11 contains the probe beam 101 of multiple wavelengths. Preferably, the uniformity of the light intensity of the probe light beams of different spectra within a single pulse is greater than 75%.
According to a preferred embodiment of the present invention, the method further comprises the following steps after the step (a): the probe beam 101 is collimated, specifically, the probe beam 101 is collimated by the collimating element 13 to obtain a parallel beam with a higher degree of collimation, which is favorable for improving the quality of the probe beam 101, and further ensures the accuracy of the laser detection system 100 in detecting the target area 200.
According to a preferred embodiment of the present invention, in the step (d), the method further comprises the following steps:
(d.1) parallelizing the reflected beam 102, specifically, forming a parallel beam after the reflected beam 102 from the target object within the target area 200 passes through the dispersive element 12; and
(d.2) converging the reflected beam 102.
According to a preferred embodiment of the present invention, in the step (d), the method further comprises the following steps: the reflected beam 102 passes through the imaging lens 210 and is received by the detector 22.
Preferably, after the step (b), further comprising the steps of: the deflection angle of the probe beam 101 after passing through the dispersion element 12 is enlarged to enlarge the scanning field of view of the laser detection system 100. Correspondingly, after the step (d), the reflected light beam 102 is received by a magnifying lens 40, and subsequently, the reflected light beam 102 reaches the optical receiving unit 21 and is converged by the optical receiving unit 21.
Further, after step (d), the detector 22 converts the reflected beam 102 into an electrical signal. Further, the processing module 30 receives the electrical signal generated by the detector 22, and analyzes and processes the electrical signal, so as to obtain the condition of the target object in the target area 200 according to the information carried by the electrical signal.
It will be appreciated by persons skilled in the art that the above embodiments are only examples, wherein features of different embodiments may be combined with each other to obtain embodiments which are easily conceivable in accordance with the disclosure of the invention, but which are not explicitly indicated in the drawings.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (22)
1. A laser detection system adapted to detect a target area, comprising:
a detection module, wherein the detection module comprises a laser generation unit and a dispersion element, wherein the laser generation unit emits a detection beam, the detection beam can reach the dispersion element, the dispersion element disperses the detection beam, the detection beam passing through the dispersion element can reach the target area, and a reflected beam is formed; and
a feedback module, wherein the feedback module is independent of the detection module, the reflected beam from within the target area is able to reach the feedback module, and the feedback module receives only the reflected beam.
2. The laser detection system of claim 1, wherein the detection module comprises a collimating element, wherein the collimating element is held between the laser generating unit and the dispersive element, and the probe beam generated by the laser generating unit passes through the collimating element and reaches the dispersive element.
3. The laser detection system of claim 2, wherein the feedback module further comprises an optical receiving unit and a detector, wherein the reflected beam passing through the optical receiving unit can reach the detector and be converted into an electrical signal by the detector.
4. The laser detection system of claim 3, further comprising a processing module, wherein the processing module is communicatively coupled to the detector.
5. The laser detection system of claim 4, wherein the processing module is communicatively connected to the laser generation unit of the detection module.
6. The laser detection system of claim 5 wherein the optical receiving unit comprises a dispersive element and a receiving optics set, wherein the receiving optics set is held between the dispersive element and the detector, respectively.
7. The laser detection system of claim 6, wherein the detector is a single point detector.
8. The laser detection system of claim 6, wherein the detector is a small area array detector.
9. The laser detection system of claim 5, wherein the optical receiving unit is an imaging lens.
10. The laser detection system of claim 9, wherein the detector is an area array detector.
11. The laser detection system of claim 5, wherein the laser generation unit is a broad spectrum pulsed light source.
12. The laser detection system of claim 11, wherein the probe beam generated by the laser generation unit varies periodically.
13. The laser detection system of claim 11, wherein a single pulse of the laser generation unit includes multiple wavelengths of the probe beam.
14. The laser detection system according to any one of claims 1 to 13, further comprising two angle magnifier, one of which is held correspondingly to one side of the dispersive element of the detection module, the probe light beam passing through the dispersive element being able to reach the angle magnifier, the other of which is held correspondingly to one side of the feedback module, the reflected light beam being able to reach the feedback module after passing through the angle magnifier.
15. The laser detection system of any of claims 1 to 13, wherein the dispersive element is a two-dimensional dispersive device.
16. A detection method for a laser detection system, the detection method comprising the steps of:
(a) generating a probe beam by a laser generating unit;
(b) dispersing the probe beam by a dispersion element;
(c) forming a reflected light beam after the detection light beam reaches a target area; and
(d) the reflected beam is received by a feedback module independent of the detection module.
17. The detection method according to claim 16, wherein in the step (a), the wavelength of the laser pulse of the probe beam generated by the laser generation unit is periodically changed with time.
18. The detection method according to claim 16, wherein in the step (a), a single pulse of the laser generation unit contains the probe beam of a plurality of wavelengths.
19. The detection method according to claim 17 or 18, wherein the step (a) is followed by further steps of: the probe beam is collimated.
20. The detection method as claimed in claim 19, further comprising, in the step (d), the steps of:
(d.1) parallelizing the reflected beam by a dispersive element of an optical receiving unit of the feedback module; and
(d.2) converging the reflected light beam by a receiving lens set of the light receiving unit.
21. The detection method of claim 19, wherein the reflected light beam is received by the detector after passing through an imaging lens.
22. The detection method of claim 16, wherein after the step (b), further comprising the steps of: the deflection angle of the probe beam after passing through the dispersion element is amplified by an angle magnifier, and the reflected beam is received by another angle magnifier.
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