Multispectral band laser-induced fluorescence radar based on Newton lens

Abstract

The utility model relates to the field of laser-induced fluorescence radars, in particular to a multi-spectral band laser-induced fluorescence radar based on a Newton lens, which comprises a laser, a scanning device, a multi-spectral band Cassegrain telescope and an imaging device, the scanning device is arranged between the laser and the multi-spectral band Cassegrain telescope, and the imaging device is arranged between the scanning device and the multi-spectral band Cassegrain telescope. The multispectral band Cassegrain telescope is arranged between the scanning device and the imaging device. According to the multi-spectral band Cassegrain telescope, the scanning device and the multi-spectral band Cassegrain telescope are arranged, the rotatable scanning reflecting mirror is arranged at the position, corresponding to the scanning opening, of the shell of the scanning device, and the scanning range can be increased by selectively rotating the scanning reflecting mirror, so that the scanning range is expanded; under the action of the Newton lens, the scanned light can be more concentrated and a larger visual field can be obtained more easily, so that the observation accuracy is improved, meanwhile, the overall structure of the laser-induced fluorescence radar can be more compact, and the convenience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser induced fluorescence radar field especially is based on newtonian mirror multispectral band laser induced fluorescence radar. BACKGROUND

[0002] Laser induced fluorescence radar makes the target produce fluorescence through laser induction scanning, and then collects the fluorescence to the imaging surface of the imaging device to form an image. In order to save the volume of radar, Cassegrain telescope is often used for observation, but Cassegrain telescope cannot screen the spectral band, resulting in that the image of the observation background and the scanning target will be superimposed together in the case of observing the relatively complex background, and finally it is impossible to distinguish each target in the obtained observation image, sometimes even it is impossible to distinguish the background and the target, and there is also the problem of insufficient concentration of observation target light. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned insufficient, provide a kind of based on newtonian mirror multispectral band laser induced fluorescence radar, with the advantages of high concentration of observation target light, wide observation field of view.

[0004] The utility model provides a kind of based on newtonian mirror multispectral band laser induced fluorescence radar, including laser, scanning device, multispectral band Cassegrain telescope and imaging device, the scanning device is located between laser and multispectral band Cassegrain telescope, and the multispectral band Cassegrain telescope is located between scanning device and imaging device;Wherein, the scanning device includes shell, scanning mirror and newtonian mirror, the scanning mirror and the newtonian mirror are located in the shell and are at the same horizontal height, and laser entrance, scanning port and fluorescence receiving port are provided on the shell, the scanning mirror is located above the scanning port and is rotationally connected with the horizontal center axis of the shell, and the laser emitted by the laser reaches scanning target through laser entrance and scanning mirror;The fluorescence induced by scanning target passes through scanning mirror, newtonian mirror, fluorescence receiving port and multispectral band Cassegrain telescope in sequence and finally forms image on imaging device.

[0005] Further, the newtonian mirror includes parabolic primary mirror and plane mirror, the parabolic primary mirror is oppositely arranged with the scanning mirror, and the plane mirror is located between the parabolic primary mirror and the scanning mirror and is inclined at 45° with the horizontal center axis in the shell.

[0006] Further, full reflection prism and collimating mirror are provided in the shell corresponding to the position of laser entrance, and the laser emitted by the laser passes through laser entrance, full reflection prism, collimating mirror, scanning mirror and scanning port in sequence.

[0007] Further, a mirror is arranged at a position corresponding to the laser incidence port outside the shell, and the laser emitted by the laser emitter enters the laser incidence port through the mirror.

[0008] Further, the scanning device further comprises a light focusing assembly, the light focusing assembly comprises a box and a plurality of convex lens pieces, the box is arranged below the shell and has an opening at the bottom corresponding to the scanning port, and the plurality of convex lens pieces are slidably arranged in the box, and the focusing of light is realized by moving at least one of the convex lens pieces above the opening.

[0009] Further, the left and right sides of the box are each provided with a sliding hole for placing the convex lens pieces one by one, and the sliding hole is provided with an elastic ball at the starting point and the ending point of the convex lens, and the elastic ball is connected with a spring, and the spring pushes the elastic ball out of the side wall of the sliding hole to fix the position of the convex lens piece.

[0010] By adopting the above technical scheme, the beneficial effects of the present application are as follows:

[0011] The present application realizes the screening and filtering of multiple spectral bands by using the multi-spectral band Cassegrain telescope, sets a Newton mirror between the scanning mirror and the multi-spectral band Cassegrain telescope, changes the induced fluorescence light path, makes the structure of the whole laser-induced fluorescence radar more compact and convenient, and at the same time, the Newton mirror makes the scanned fluorescence light more concentrated and the field of view larger, greatly improves the observation accuracy. By setting multiple adjustable convex lenses below the scanning port, the concentration degree of light is increased.

[0012] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure.

[0013] It is obvious that the above purposes and other purposes of the present application will become more apparent after the description of the preferred embodiments of the present application with various drawings and drawings.

[0014] In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, one or more preferred embodiments are described below, and the drawings are shown, and the detailed description is as follows. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the present application, and do not constitute a limitation on the present application.

[0016] In the drawings, the same parts are marked with the same reference numerals, and the drawings are schematic and are not necessarily drawn according to the actual proportions.

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only one or some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a structural schematic diagram of laser-induced fluorescence radar.

[0019] Figure 2 It is a structural schematic diagram of scanning device.

[0020] Figure 3 It is a structural schematic diagram of multi-spectral band Cassegrain telescope.

[0021] Figure 4 It is a structural schematic diagram of light focusing assembly.

[0022] Figure 5 It is a structural schematic diagram of elastic ball.

[0023] Main figure mark explanation:

[0024] 1-laser;

[0025] 2-scanning device;

[0026] 21-housing; 211-laser incidence port; 212-scanning port; 213-fluorescence receiving port; 22-scanning mirror; 23-Newton mirror; 231-parabolic primary mirror; 232-flat mirror;

[0027] 3-multi-spectral band Cassegrain telescope;

[0028] 4-imaging device;

[0029] 5-total reflection prism;

[0030] 6-collimating mirror;

[0031] 7-mirror;

[0032] 8-light focusing assembly;

[0033] 81-box; 82-lens; 811-sliding hole; 83-elastic ball; 84-spring. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, but not to limit the present application.

[0035] Referring to Figures 1-5 The utility model provides a kind of based on newton mirror 23 multispectral band laser-induced fluorescence radar.The radar includes laser 1, scanning device 2, multispectral band cassegrain telescope 3 and imaging device 4.Scanning device 2 is located between laser 1 and multispectral band cassegrain telescope 3, and multispectral band cassegrain telescope 3 is located between scanning device 2 and imaging device 4.

[0036] Laser 1 refers to the device that can emit laser, which can use ND2 YAG laser 1, which is controlled by laser system controller.Scanning device 2 refers to the laser emitted by laser 1 can be shot to scanning target after processing, and the fluorescence of scanning target is received to multispectral band cassegrain telescope 3 after processing.Multispectral band cassegrain telescope 3 refers to the observation of received scanning target, and the spectral band of filter can be flexibly replaced according to the observation object, which can select the multispectral band cassegrain telescope 3 disclosed in the patent with announcement number CN115061151A.Imaging device 4 refers to the device that can image the image of received scanning target, and finally imaging result can be obtained, which can include imaging surface and imaging sensor, and imaging surface is used to form the light signal of the image of target area observed by cassegrain telescope.For weak signal observation, it is photosensitive surface of image intensifier;for stronger signal observation, it is imaging focal plane of imaging sensor.Imaging sensor can be CCD image sensor or CMOS image sensor, which converts the light signal information of target observed by cassegrain telescope into corresponding electrical signal information.

[0037] Scanning device 2 includes shell 21, scanning mirror 22 and newton mirror 23.Scanning mirror 22 and newton mirror 23 are both located in the shell 21 and are at the same horizontal height.Newton mirror 23 includes parabolic primary mirror 231 and plane mirror 232, parabolic primary mirror 231 is oppositely arranged with scanning mirror 22, and plane mirror 232 is located between parabolic primary mirror 231 and scanning mirror 22 and is inclined at 45° with horizontal center axis in the shell 21.Laser entrance 211, scanning port 212 and fluorescence receiving port 213 are provided on the shell 21, and scanning mirror 22 is located above scanning port 212 and is rotationally connected with horizontal center axis of the shell 21, and scanning range can be increased by rotating scanning mirror 22 during use.

[0038] Laser emitted by laser 1 reaches scanning target through laser entrance 211 and scanning mirror 22, and fluorescence induced by scanning target passes through scanning mirror 22, newton mirror 23, fluorescence receiving port 213 and multispectral band cassegrain telescope 3 in turn and finally images on imaging device 4.

[0039] In order to improve the transmission effect of laser, a total reflection prism 5 and a collimating mirror 6 are arranged in the shell 21 corresponding to the position of the laser incidence port 211, and the laser emitted by the laser 1 sequentially passes through the laser incidence port 211, the total reflection prism 5, the collimating mirror 6, the scanning mirror 22 and the scanning port 212.

[0040] In order to save the volume of the radar, a reflecting mirror 7 is arranged outside the shell 21 corresponding to the position of the laser incidence port 211, and the laser 1 is at the same height as the reflecting mirror 7, and the laser emitted by the laser 1 can enter the laser incidence port 211 through the reflecting mirror 7.

[0041] Further, the scanning device 2 further comprises a light condensing assembly 8, the light condensing assembly 8 comprises a box body 81 and a plurality of convex lens sheets 82. The box body 81 is arranged below the shell 21 and the bottom of the box body 81 is provided with an opening hole corresponding to the scanning port 212, and the plurality of convex lens sheets 82 are slidably arranged in the box body 81. The focusing of light is realized by moving at least one convex lens sheet 82 above the opening hole. The movement of the convex lens sheet 82 can be realized by: a sliding hole 811 is arranged on the left and right sides of the box body 81, and the sliding hole 811 is provided with an elastic ball 83 at the starting point and the ending point of the convex lens, and the elastic ball 83 is connected with a spring 84, and the spring 84 pushes the elastic ball 83 out of the side wall of the sliding hole 811 to realize fixation. The convex lens sheets 82 are selected according to the size of the imaging image, and the movement of the convex lens is carried out according to the sequence from bottom to top.

[0042] Working principle: first, the scanning port 212 of the scanning device 2 is directed towards the scanning target, then the laser emitted by the laser 1 is reflected to the laser incidence port 211 through the reflecting mirror 7, the laser enters the laser incidence port 211 and is reflected to the collimating mirror 6 by the total reflection prism 5, then the laser is transmitted to the scanning mirror 22 by the collimating mirror 6, the laser is reflected to the scanning port 212 by the scanning mirror 22, the position and the number of the convex lens sheets 82 are adjusted so that the laser is shot on the scanning target, and the scanning target generates fluorescence, the fluorescence is reflected to the Newton mirror 23 through the scanning port 212 and the scanning mirror 22, the fluorescence is reflected to the multi-spectral band Cassegrain telescope 3 by the Newton mirror 23, the spectrum reflected by the multi-spectral band Cassegrain telescope 3 is reflected to the imaging surface of the imaging device 4, an image is formed on the imaging surface, and the light signal is converted into an electric signal by the imaging sensor. During this period, the angle of the scanning mirror 22 can be rotated, so as to increase the scanning range.

[0043] It should be understood that the embodiments disclosed in the present application are not limited to the specific processing steps or materials disclosed herein, but should extend to the equivalent alternatives of such features understood by those skilled in the related art. It should also be understood that the terms used herein are for the purpose of describing specific embodiments only and are not meant to be limiting.

[0044] Reference in the specification to "an embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0045] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided, such as particular thicknesses, numbers of components, etc., to provide a thorough understanding of embodiments of the application.

Claims

1. A multi-spectral laser-induced fluorescence radar based on a Newton mirror, characterized in that: The invention comprises a laser, a scanning device, a multi-spectral band Cassegrain telescope and an imaging device, wherein the scanning device is arranged between the laser and the multi-spectral band Cassegrain telescope, and the multi-spectral band Cassegrain telescope is arranged between the scanning device and the imaging device; The scanning device includes a shell, a scanning reflector and a Newtonian mirror. The scanning reflector and the Newtonian mirror are both arranged in the shell and are at the same horizontal height. The shell is provided with a laser incident port, a scanning port and a fluorescence receiving port. The scanning reflector is located above the scanning port and is rotatably connected to the horizontal center axis of the shell. The laser emitted by the laser passes through the laser incident port and the scanning reflector to reach the scanning target; the fluorescence induced by the scanning target passes through the scanning reflector, the Newtonian mirror, the fluorescence receiving port and the multi-spectral band Cassegrain telescope in sequence and finally forms an image on the imaging device.

2. The Newton mirror-based multi-spectral laser-induced fluorescence radar according to claim 1, characterized in that: The Newton mirror includes a parabolic primary mirror and a plane reflector. The parabolic primary mirror and the scanning reflector are arranged opposite to each other. The plane reflector is located between the parabolic primary mirror and the scanning reflector and is inclined at 45 degrees to the horizontal central axis in the shell.

3. The multi-spectral laser-induced fluorescence radar based on Newton mirror according to claim 1, characterized in that: A total reflection prism and a collimating mirror are provided in the housing at a position corresponding to the laser incident port. The laser light emitted by the laser passes through the laser incident port, the total reflection prism, the collimating mirror, the scanning reflector and the scanning port in sequence.

4. The multi-spectral laser-induced fluorescence radar based on Newton mirror according to claim 1, characterized in that: A reflector is provided at a position outside the shell corresponding to the laser incident port, and the laser emitted by the laser enters the laser incident port through the reflector.

5. The multi-spectral laser-induced fluorescence radar based on Newton mirror according to claim 1, characterized in that: The scanning device also includes a focusing component, which includes a box and several convex lens sheets. The box is arranged below the shell and has an opening corresponding to the scanning port at the bottom. Several convex lens sheets are slidably arranged in the box, and light focusing is achieved by moving at least one of the convex lens sheets to the top of the opening.

6. The multi-spectral laser-induced fluorescence radar based on Newton mirror according to claim 5, characterized in that: The left and right sides of the box body are provided with sliding holes for placing the convex lens sheets one by one. The sliding holes are provided with elastic balls at the starting point and the end point of the convex lens. The elastic balls are connected to springs. The springs push the elastic balls out from the side walls of the sliding holes to fix the positions of the convex lens sheets.

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