CN101923161B

CN101923161B - Device and method for detecting co-optical system and co-detector glimmer passive and laser active compound imaging

Info

Publication number: CN101923161B
Application number: CN 201010266335
Authority: CN
Inventors: 孙剑峰; 王骐; 梁小雪; 魏靖松; 郜键
Original assignee: Harbin Institute of Technology Shenzhen
Current assignee: Harbin Institute of Technology Shenzhen
Priority date: 2010-08-30
Filing date: 2010-08-30
Publication date: 2012-12-05
Anticipated expiration: 2030-08-30
Also published as: CN101923161A

Abstract

The invention discloses a detection device and method for low-light passive and laser active compound imaging of a common optical system and a common detector, and relates to the field of imaging radar detection devices. It solves the problems of low integration, complex information fusion and low fusion degree of existing active-passive composite imaging devices. The light emitted by the optical system of the device can be focused on the photocathode of the stripe tube detector, and then coupled The lens receives the light emitted by the fluorescent screen of the stripe tube detector, which is photographed by the CCD camera. The method is realized by a detection device based on the low-light passive and laser active composite imaging of a common optical system and a common detector. First, the laser does not emit light and obtains a low-light passive image of the target; two. The laser emits laser light to obtain the target 3. Composite the low-light passive image of the target and the laser active 4D image to obtain the information fusion image of the common optical system and the detector. The invention is suitable for low-light passive and laser active compound imaging fields.

Description

Centered optical system is passive sniffer and the method with laser active compound imaging of the low-light of detector altogether

Technical field

The present invention relates to imaging radar sniffer field, be specifically related to passive sniffer and the method with laser active compound imaging of a kind of low-light.

Background technology

At present, existing master is passive, and complex imaging mainly contains dual mode, and a kind of is the non-detector altogether of non-centered optical system, and promptly active imaging and passive imaging has separately optical system and detector; Another kind is the non-altogether detector of centered optical system, i.e. the shared same set of optical system of active imaging and passive imaging, but still need two detectors.Since the passive complex imaging mode of above-mentioned two kinds of masters can not be shared a cover optical system and a same detector; Make the imaging detecting device integrated level not high; And because initiatively different with the optical system field angle of imaging and passive imaging; And the resolution of detector is different, has caused the blending algorithm complicacy and the degrees of fusion of active imaging and passive imaging not high.

Summary of the invention

The present invention is in order to solve the problem that the passive complex imaging device of existing master integrated level is not high, information fusion is complicated and degrees of fusion is not high, and a kind of centered optical system passive sniffer and method with laser active compound imaging of the low-light of detector altogether is provided.

Centered optical system is the passive sniffer with laser active compound imaging of the low-light of detector altogether; It comprises receiving optics 1, striped pipe detector 7, coupled lens 8, CCD camera 9, delay trigger circuit 10, laser instrument 11, optical transmitting system 12 and power supply 15; Laser instrument 11 is arranged on the rear end face of optical transmitting system 12; Become parallel linear light output after the laser that makes laser instrument 11 send expands bundle through optical transmitting system 12, said parallel linear light is incident to receiving optics 1 through behind the target reflection; The camera lens of said receiving optics 1, striped pipe detector 7, coupled lens 8 and CCD camera 9 is arranged in order; Photocathode 2 in the striped pipe detector 7 is arranged on the focal plane of receiving optics 1; Feasible light by receiving optics 1 outgoing can focus on the photocathode 2 of striped pipe detector 7; Coupled lens 8 is arranged in the coverage of video screen 6 emergent lights in the striped pipe detector 7; Make coupled lens 8 can receive whole light that video screen 6 sends; The camera lens of CCD camera 9 is arranged on the focal plane of coupled lens 8, and power supply 15 provides electric energy for laser instrument 11 and delay trigger circuit 10 simultaneously, and the signal output part of delay trigger circuit 10 links to each other with the trigger pip input end of the sweep circuit 3 of striped pipe detector 7.

Centered optical system is the passive detection method with laser active compound imaging of the low-light of detector altogether, and it is based on centered optical system the low-light of detector is passive altogether realizes that with the sniffer of laser active compound imaging said method detailed process is following:

Step 1, laser instrument 11 and electrode 4 are not worked; Through the faint natural light of target reflection,, launch electronics on the photocathode 2 by focusing on the photocathode 2 of striped pipe detector 7 after receiving optics 1 collection; After said electronics strengthens through microchannel plate 5; Bombard formation target picture on the video screen 6, the target picture is coupled on the CCD camera 9 through coupled lens 8 again, obtains the passive picture of low-light of target;

Step 2, power supply 15 are for laser instrument 11 and delay trigger circuit 10 provide power supply, and sweep circuit 3 adds sweep voltage between electrode 4 two-plates, and laser instrument 11 is to target emission laser; Delay trigger circuit 10 triggers, the laser that laser instrument 11 sends are collected after the slit diaphragm 13 of striped pipe detector 7 by receiving optics 1 through the light wave of target reflection; Be incident on the photocathode 2, and launch photoelectron, delay trigger circuit 10 time-delays simultaneously finish; Trigger sweep circuit 3 work of striped pipe detector 7, when photocathode 2 ejected electron during through the parallel pole passage, said electronics deflects; The electronic deflection of different time is apart from difference; After electronics strengthens through microchannel plate 5, bombard formation target picture on the video screen 6, the target picture is coupled on the CCD camera 9 through coupled lens 8 again; Obtain the four-dimensional picture of laser active of target, said laser initiatively four-dimension picture is three-dimensional geometry distance images that reflects target range information and the one dimension intensity picture that reflects target material characteristic;

The passive picture of low-light of step 3, target that step 1 is obtained and the laser of the target that step 2 obtains are initiatively four-dimensional as compound, obtain centered optical system detector information fusion image altogether.

Good effect of the present invention:

Apparatus and method of the present invention; The passive picture of the low-light that obtains target and laser initiatively as process in; Shared same optical system and same striped pipe detector; Two kinds image co-registration information fusion technology fusion relative and in the past is easy and degrees of fusion is high, can realize quick search, high precision identification and real-time precision strike to target, and can accomplish the high integration miniaturization.

The present invention is applicable to the passive and laser active compound imaging field of low-light.

Description of drawings

Fig. 1 is the altogether structural representation of the passive sniffer with laser active compound imaging of the low-light of detector of centered optical system.

Embodiment

Embodiment one: combine Fig. 1 that this embodiment is described; Centered optical system is the passive sniffer with laser active compound imaging of the low-light of detector altogether; It comprises receiving optics 1, striped pipe detector 7, coupled lens 8, CCD camera 9, delay trigger circuit 10, laser instrument 11, optical transmitting system 12 and power supply 15; Laser instrument 11 is arranged on the rear end face of optical transmitting system 12; Become parallel linear light output after the laser that makes laser instrument 11 send expands bundle through optical transmitting system 12, said parallel linear light is incident to receiving optics 1 through behind the target reflection; The camera lens of said receiving optics 1, striped pipe detector 7, coupled lens 8 and CCD camera 9 is arranged in order; Photocathode 2 in the striped pipe detector 7 is arranged on the focal plane of receiving optics 1; Feasible light by receiving optics 1 outgoing can focus on the photocathode 2 of striped pipe detector 7; Coupled lens 8 is arranged in the coverage of video screen 6 emergent lights in the striped pipe detector 7; Make coupled lens 8 can receive whole light that video screen 6 sends; The camera lens of CCD camera 9 is arranged on the focal plane of coupled lens 8, and power supply 15 provides electric energy for laser instrument 11 and delay trigger circuit 10 simultaneously, and the signal output part of delay trigger circuit 10 links to each other with the trigger pip input end of the sweep circuit 3 of striped pipe detector 7.

Embodiment two: this embodiment is further specifying embodiment one; Said striped pipe detector 7 comprises slit diaphragm 13, photocathode 2, sweep circuit 3, electrode 4, microchannel plate 5 and video screen 6; Two parallel plate electrodes of electrode 4 are oppositely arranged; Slit diaphragm 13, photocathode 2, microchannel plate 5 and video screen 6 be co-axial alignment successively; And slit diaphragm 13, photocathode 2, microchannel plate 5 and video screen 6 are vertical with two parallel plate electrodes of electrode 4; Two parallel plate electrodes of the slit direction of slit diaphragm 13 and electrode 4 that direction is set is parallel, the signal output part of said sweep circuit 3 links to each other with the signal input part of a parallel plate electrode of electrode 4, the signal input part ground connection of another parallel plate electrode of electrode 4.

Embodiment three, this embodiment are further specifying embodiment one or two; Striped pipe detector 7 adopts single slit striped pipe; The dynamic space resolution characteristic of this list slit striped pipe is>=15lp/mm that distance resolution is＜0.5m that the minimum detectable energy is 10 ^-15J/mm ²

Embodiment four: this embodiment is to the further specifying of embodiment one, two, three or four, and laser instrument 11 adopts the Nd:YAG pulsed lasers, and to be 355nm, pulsewidth be＜10ns to the wavelength of the laser beam of said laser instrument 11 outputs.

Embodiment five: this embodiment is that optical transmitting system 12 is a set of cylindrical lenses to the further specifying of embodiment one, two, three, four or five.

Embodiment six: centered optical system is the passive detection method with laser active compound imaging of the low-light of detector altogether; It is based on centered optical system altogether the low-light of detector is passive realizes that with the sniffer of laser active compound imaging said method detailed process is following:

In the process that step 1 is carried out, when laser instrument 11 was not luminous, the sweep circuit 3 of striped pipe detector 7 was not worked; The electrode 4 of striped pipe detector 7 is not charged at this moment; Through the faint light wave that the natural light or the target self of target reflection are sent, by focusing on the photocathode 2 of striped pipe detector 7 after receiving optics 1 collection, the electronics after the conversion does not deflect through behind the electrode 4; After the electronics of not deflection strengthens through microchannel plate 5; Bombard formation target slit scan image on the video screen 6, the target slit scan image is coupled on the CCD camera 9 through coupled lens 8 again, obtains the passive picture of low-light of target;

In the process that step 2 is carried out, laser instrument 11 emission laser, delay trigger circuit 10 work; Trigger sweep circuit 3 work of striped pipe detector 7, the electrode 4 of striped pipe detector 7 is charged at this moment, the light wave of laser behind target reflection; By the photocathode 2 that focuses on striped pipe detector 7 after receiving optics 1 collection, the electronics after the conversion is through behind the electrode 4, and electronics deflects; The different photoelectron deflection distances that arrive constantly are different; After electronics strengthens 5 through microchannel plate, bombard formation target picture on the video screen 6, the target picture is coupled on the CCD camera 9 through coupled lens 8 again; Obtain the four-dimensional picture of laser active of target, promptly reflect the one dimension intensity picture of three-dimensional geometry distance images with the reflection target material characteristic of target range information;

Voltage between sweep circuit 3 control electrodes 4 two-plates; Make that the process deflected by the photoelectron of launching on the photocathode 2 is following:, extract the one-dimensional space information of target at the slit place of slit diaphragm 13 and be imaged on the photocathode 2 of striped pipe detector 7 from the light pulse of target reflection; When being thrown light on by the light pulse of target reflection with the corresponding position of slit part on the photocathode 2; This part will be launched photoelectron; And photoelectronic transient state emission density is proportional to the light pulse intensity in this moment; The duration of the photoelectron pulse that is produced is exactly the duration of incident light pulse, so the photoelectron pulse that photocathode 2 sends is the duplicate of the light pulse of target reflection on space-time structure; As long as manage to measure the space-time structure of photoelectron pulse, just can obtain the space-time structure of incident light pulse, i.e. the space-time structure of the light pulse of target reflection.The sweep circuit 3 of striped pipe detector 7 has the ramp voltage of linear change in time; Be added with the ramp voltage of linear change in time between two parallel plate electrodes of electrode 4; The different photoelectrons that get into deflection system constantly receive the effect of different deflection voltages, when said photoelectron arrives video screen, will launch along the direction perpendicular to slit; Therefore this direction can obtain the temporal information of launching along the slit every bit corresponding to time shaft.Synchronous for ramp voltage between two parallel plate electrodes that guarantee sweep circuit 3 and electrode 4, by laser instrument 11 a part of light is delivered to delay trigger circuit 10, because 3 work of delay trigger circuit 10 time-delay back trigger sweep circuit.After photoelectron after the deflection strengthens through microchannel plate 5, bombard on the video screen 6 and convert visible light into, and form the target slit scan image.The slit scan image of video screen 6 outputs adopts CCD camera 9 to read image and record in real time.

Because electron beam has much little inertia at the volley than any physical construction, and utilizes supper-fast on-off element to be easy to produce the required voltage waveform of transient electric field, so the striped Manifold technology can obtain high temporal resolution.

Claims

1. The detection method based on the detection device of the low-light passive and laser active composite imaging of the common optical system and common detector, the detection device of the low-light passive and laser active composite imaging of the common optical system and common detector includes a receiving optical system (1 ), streak tube detector (7), coupling lens (8), CCD camera (9), delay trigger circuit (10), laser (11), emission optical system (12) and power supply (15), laser (11 ) is arranged on the rear end face of the emitting optical system (12), so that the laser light emitted by the laser (11) becomes parallel line light output after being expanded by the emitting optical system (12), and the parallel line light is incident on the target after being reflected by the target Receiving optical system (1); the lenses of the receiving optical system (1), the streak tube detector (7), the coupling lens (8) and the CCD camera (9) are arranged in sequence, and the photoelectric in the streak tube detector (7) The cathode (2) is arranged on the focal plane of the receiving optical system (1), so that the light emitted by the receiving optical system (1) can be focused on the photocathode (2) of the stripe tube detector (7), and the coupling lens (8 ) is arranged in the coverage of the fluorescent screen (6) outgoing light in the streak tube detector (7), so that the coupling lens (8) can receive all the light that the fluorescent screen (6) sends, and the lens of the CCD camera (9) is arranged on On the focal plane of the coupling lens (8), the power supply (15) provides electric energy for the laser (11) and the delay trigger circuit (10) at the same time, and the signal output terminal of the delay trigger circuit (10) is connected to the stripe tube detector (7) The trigger signal input terminal of the scanning circuit (3) is connected;

It is characterized in that: the specific process of the detection method realized based on the detection device is as follows:

Step 1, the laser (11) and the electrode (4) do not work, the weak natural light reflected by the target is collected by the receiving optical system (1) and focused on the photocathode (2) of the stripe tube detector (7), the photocathode (2) emits electrons, and after the electrons are strengthened by the microchannel plate (5), they are bombarded on the fluorescent screen (6) to form the target image, and the target image is coupled to the CCD camera (9) through the coupling lens (8) again, Obtain low-light passive image of the target;

Step 2, the power supply (15) provides power for the laser (11) and the delay trigger circuit (10), the scanning circuit (3) adds a sweep voltage between the two pole plates of the electrode (4), and the laser (11) emits laser light to the target, The delay trigger circuit (10) starts to delay, and the laser light emitted by the laser (11) is reflected by the target, and after being collected by the receiving optical system (1), it passes through the slit diaphragm (11) of the stripe tube detector (7), Incidence on the photocathode (2), and emit photoelectrons, and the delay trigger circuit (10) delays at the same time, triggers the scanning circuit (3) of the stripe tube detector (7) to work, when the photocathode (2) emits When electrons pass through parallel electrode channels, the electrons are deflected, and the electron deflection distances at different times are different. After the electrons are enhanced by the microchannel plate (5), they are bombarded on the fluorescent screen (6) to form a target image, and the target image passes through the coupling lens ( 8) coupled to the CCD camera (9) to obtain the active four-dimensional laser image of the target, the active four-dimensional image of the laser is a two-dimensional geometric distance image reflecting the target distance information and a one-dimensional intensity image reflecting the material characteristics of the target;

Step 3: Composite the low-light passive image of the target obtained in step 1 and the laser active four-dimensional image of the target obtained in step 2 to obtain an information fusion image of a common optical system and a common detector.

2. The detection method realized by the detecting device based on the low-light passive and laser active composite imaging of the common optical system common detector according to claim 1, characterized in that the striped tube detector (7) comprises a slit diaphragm (13), photocathode (2), scanning circuit (3), electrode (4), microchannel plate (5) and fluorescent screen (6), two parallel polar plates of electrode (4) are arranged oppositely, slit diaphragm (13), photocathode (2), microchannel plate (5) and phosphor screen (6) are coaxially arranged successively, and slit diaphragm (13), photocathode (2), microchannel plate (5) and phosphor screen ( 6) perpendicular to the two parallel pole plates of the electrode (4), the slit direction of the slit diaphragm (13) is parallel to the setting direction of the two parallel pole plates of the electrode (4), and the scanning circuit (3) The signal output end is connected with the signal input end of one parallel plate of the electrode (4), and the signal input end of the other parallel plate of the electrode (4) is grounded.

3. according to claim 1 or 2, the detection method realized by the detection device based on the low-light passive and laser active composite imaging of the common optical system common detector, is characterized in that the stripe photodetector (7) adopts the single slit stripe tube, the dynamic spatial resolution of the single-slit striped tube is ≥15lp/mm, the distance resolution is <0.5m, and the minimum detectable energy is 10 ^-15 Jmm ² .

4. according to claim 1 or 2, the detecting method realized by the detection device based on the low-light passive and laser active compound imaging of common optical system common detector, it is characterized in that laser (11) adopts Nd: YAG pulsed laser, so The wavelength of the laser beam output by the laser (11) is 355nm, and the pulse width is <10ns.

5. The detection method realized by the detection device based on the low-light passive and laser active composite imaging of common optical system and common detector according to claim 1 or 2, characterized in that the emission optical system (12) is a cylindrical lens group.