CN108709640A - Multispectral complex detection system - Google Patents

Abstract

The invention proposes a multi-spectral composite detection system, which mainly solves the technical problems that the existing multi-spectral detection system has few infrared detection bands, insufficient real-time performance and low tracking accuracy. It includes an imaging system unit, an information processing unit, and a control unit. The imaging system unit uses near-infrared, mid-infrared and far-infrared cameras and position-sensitive detectors to obtain three-dimensional images of the same scene and the same target through the spectroscopic/coaxial optical path of the imaging system unit. The information processing unit calculates the center of mass of the infrared target according to the infrared target image to obtain its position and angle information, and the control unit adjusts the attitude according to the position and angle information of the infrared target to realize the aiming, tracking and detection of the infrared target. The invention expands the infrared target detection band, effectively improves the target recognition ability and anti-interference ability of the system, improves the tracking accuracy and real-time performance of the infrared target, and can be used for vehicle and ship night vision, security and anti-terrorism, fire protection, engineering control and monitoring.

Description

Multi-spectral compound detection system

technical field

The invention belongs to the technical field of optoelectronics, and in particular relates to a multi-spectrum composite detection system, which can be used for vehicle and ship night vision, security and anti-terrorism, fire protection, engineering control and monitoring.

Background technique

With the development of optoelectronic technology and the increasingly complex detection environment, it will be difficult for a detection system with a single frequency band or mode to meet future needs, so the corresponding detection system must also continue to develop and innovate.

Existing detection systems are mainly divided into single-band detection systems and multi-spectral detection systems. Among them, a single-band detection system generally uses an imaging device and an optical filter combination, which is good for a certain segment of the image, but not good for other bands, which will lead to incomplete imaging, including target information. less, and a lot of useful information will be lost.

The multi-spectral detection system, by using multiple sensors, can obtain target information of multiple bands, and at the same time obtain richer spectral information, which can improve the detection accuracy of the detection system, and at the same time identify targets through image fusion, identify and locate targets It has been greatly improved, and has extremely broad development prospects in terms of scope of application, detection accuracy, and system stability. However, multi-spectral detection generally requires the use of two or more infrared cameras of different wavelength bands and multiple sets of independent optical lenses to image a target, but there are always some small differences in the spatial attitudes of multiple imaging devices, and the detection results have target The positioning is inaccurate, the cost of the method is high, and the device occupies a large area. At the same time, there are problems of narrow detection band range for infrared bands, complex structure, high cost, poor real-time performance and insufficient detection accuracy.

Contents of the invention

The object of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a multi-spectral composite detection system to expand the band range of infrared target detection, improve the accuracy of target detection position and the real-time performance of target detection.

To achieve the above object, the multi-spectral compound detection system of the present invention comprises imaging system unit, information processing unit and control unit, is characterized in that:

The imaging system unit is composed of a near-infrared camera, a mid-infrared camera, a far-infrared camera, a position-sensitive detector PSD, a fast mirror and 7 beam splitters. All components are placed in three rows in parallel, wherein:

In the first row, the first beamsplitter, the second beamsplitter, the third beamsplitter and the position-sensitive detector PSD are placed sequentially from left to right,

In the second row, the fast reflector, the fourth beam splitter, the fifth beam splitter and the near-infrared camera are placed in order from left to right.

In the third row, the far-infrared camera, the sixth beam splitter, the seventh beam splitter and the mid-infrared camera are placed in order from left to right.

The fast reflector is opposite to the second beam splitter, the sixth beam splitter is opposite to the fourth beam splitter, the seventh beam splitter is opposite to the fifth beam splitter,

All the components are covered with a casing, and a light-through window is arranged at the casing in front of the first beam splitter;

The target infrared light enters the first beam splitter through the light window, shines on the second beam splitter and is divided into two paths a and b, of which one path a enters the PSD through the third beam splitter, and the other path b illuminates the fourth beam splitter through the fast reflector The mirror is further divided into two channels b ₁ and b ₂ , one channel b ₁ enters the far infrared camera through the sixth beam splitter, the other channel b ₂ passes through the fifth beam splitter and then is divided into two channels b ₂₁ and b ₂₂ , and one channel b ₂₁ enters Near-infrared camera, the other channel b ₂₂ enters the mid-infrared camera after passing through the seventh beam splitter, and ensures that the center of the light spot formed by the near-infrared camera, mid-infrared camera, and far-infrared camera is in the center of the imaging surface, and at the same time ensures that the position-sensitive detector PSD The position angle information is zero.

Further, after the target infrared light is incident through the light-transmitting window, it is necessary to ensure that the position angle information of the position-sensitive detector PSD is zero, by adjusting the relative position, height and angle of the second beam splitter, the third beam splitter and the sensitive detector PSD to fulfill.

Further, after the target infrared light is incident through the light-transmitting window, it is necessary to ensure that the center of the light spot formed by the near-infrared camera, mid-infrared camera, and far-infrared camera is in the center of the imaging surface, first by adjusting the relative position of the fifth beam splitter and the near-infrared camera , height and angle, then adjust the relative position, height and angle of the seventh beam splitter and the mid-infrared camera, and finally adjust the relative position, height and angle of the sixth beam splitter and the far-infrared camera to achieve.

Further, the information processing unit includes:

CCD processing module, the CCD processing module performs noise filtering, background segmentation, centroid calculation on the infrared image obtained by the imaging processing unit, and outputs position offset and angle,

A PSD processing module, the PSD processing module processes the position and angle information of the light spot obtained by the imaging processing unit and outputs the position offset and the included angle.

Further, the control unit includes:

The display module is used to display in real time the infrared image obtained by the CCD camera of the imaging system unit and the position offset and angle obtained by the information processing unit;

The lower computer communication module is used to transmit the position offset and angle of the information processing unit to the upper computer communication module of the control unit, and receive the instruction information from the upper computer communication module of the control unit;

The upper computer communication module is used to receive the information of the lower computer communication module, and send instruction information to the attitude adjustment module and the lower computer communication module;

The attitude adjustment module is used to receive the instruction information of the upper computer communication module, and control the turntable to realize the attitude adjustment.

Compared with the prior art, the present invention has the following advantages:

1. The present invention obtains spectral images of three different bands of the same target in the same scene through the light splitting/coaxial optical path and four imaging detection optical paths, and realizes multiplexed multispectral imaging detection.

2. The present invention expands the detection band of the guidance system by multiplexing multispectral imaging, thereby improving the information acquisition capability of the detection system, realizing the enhancement of the difference between the target and the background, and effectively improving the target recognition capability and Anti-interference ability.

3. The present invention uses a splitting/coaxial optical path and three imaging detection optical paths to share one optical window, which reduces the difficulty of mechanical structure design and installation and adjustment of the entire system compared with the use of multiple relatively independent subsystems.

The actual measurement results show that the bandwidth of the present invention can reach 100Hz, the real-time performance is good, the tracking precision is less than or equal to 10mrad, and the tracking precision is high.

Description of drawings

Fig. 1 is a system block diagram of the present invention;

Fig. 2 is a structural diagram of the imaging system unit in the present invention;

Fig. 3 is a block diagram of an information processing unit in the present invention;

Fig. 4 is a block diagram of the control unit in the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific examples described here are only used to explain the present invention, not to limit the present invention.

Referring to Fig. 1, the present invention includes an imaging system unit, an information processing unit and a control unit,

The imaging system unit includes near-infrared camera, mid-infrared camera, far-infrared camera and position-sensitive detector PSD; the information processing unit includes CCD processing module and PSD processing module; the control unit includes display module, lower computer communication module, upper computer communication module And the attitude adjustment module, the infrared target obtains the near-infrared, mid-infrared, and far-infrared target information through the imaging system unit, and the infrared target information obtains the infrared target offset position and angle information through the information processing unit, and finally performs target display and attitude through the control unit Adjustment.

Referring to Fig. 2, the near-infrared camera, mid-infrared camera, far-infrared camera, position-sensitive detector PSD, fast mirror and 7 dry beam splitters in the imaging system unit are placed in three rows in parallel, wherein:

In the first row, the first beamsplitter, the second beamsplitter, the third beamsplitter and the position-sensitive detector PSD are placed sequentially from left to right,

In the second row, the fast reflector, the fourth beam splitter, the fifth beam splitter and the near-infrared camera are placed in order from left to right.

In the third row, the far-infrared camera, the sixth beam splitter, the seventh beam splitter and the mid-infrared camera are placed in order from left to right.

The fast reflector is opposite to the second beam splitter, the sixth beam splitter is opposite to the fourth beam splitter, the seventh beam splitter is opposite to the fifth beam splitter,

All the components are covered with a casing, and a light-through window is arranged at the casing in front of the first beam splitter;

The target infrared light enters the first beam splitter through the light window, shines on the second beam splitter and is divided into two paths a and b, of which one path a enters the PSD through the third beam splitter, and the other path b illuminates the fourth beam splitter through the fast reflector The mirror is further divided into two channels b ₁ and b ₂ , one channel b ₁ enters the far infrared camera through the sixth beam splitter, the other channel b ₂ passes through the fifth beam splitter and then is divided into two channels b ₂₁ and b ₂₂ , and one channel b ₂₁ enters For the near-infrared camera, the other channel b ₂₂ enters the mid-infrared camera after passing through the seventh beam splitter. At this time, first adjust the relative position, height and angle of the fifth beam splitter and the near-infrared camera, and then adjust the seventh beam splitter and the mid-infrared camera. The relative position, height and angle of the camera, and finally adjust the relative position, height and angle of the sixth beam splitter and the far-infrared camera to ensure that the center of the spot formed by the near-infrared camera, mid-infrared camera, and far-infrared camera is in the center of the imaging surface, and at the same time It is necessary to ensure that the position and angle information of the position-sensitive detector PSD is zero by adjusting the relative position, height and angle of the second beam splitter, the third beam splitter and the sensitive detector PSD.

The first beam splitter, the fourth beam splitter, the fifth beam splitter, the sixth beam splitter and the seventh beam splitter adopt but not limited to BSW-520 beam splitter, the second beam splitter and the third beam splitter adopt but not limited to BSW -711 beamsplitters, 7 beamsplitters with a splitting ratio of 50:50.

The near-infrared camera adopts but is not limited to the Bobcat-320-GigE model, the lens adopts the ASY-000409 model, the detection band is 0.9-1.7 μm, the pixel size range is 15-20mm, and the image bit depth is ≥ 8 bits.

The mid-infrared camera adopts but is not limited to the Tigris-640-MCT model, the lens adopts the OPT-000226 model, the detection band is 3.7-4.8 μm, the pixel size range is 15-20mm, and the image bit depth is ≥ 8 bits.

The far-infrared camera adopts but is not limited to the Gobi-640-50mK-GigE model, the lens adopts the LM50HC-SW model, the detection band is 8-12μm, the pixel size range is 15-20mm, the image bit depth is ≥ 8 bits, and the bit sensitivity The detector PSD is selected but not limited to the German PSD4Dc model.

Referring to Fig. 3, the CCD processing module in the information processing unit is used to perform noise filtering, background segmentation, and centroid calculation on the infrared picture obtained by the imaging processing unit, and then deliver the image processed picture to the control unit for display, and The position offset and included angle after data processing are transmitted to the control unit for attitude control; the PSD processing module is used to process the spot position and angle information obtained by the imaging processing unit and output the position offset and included angle to the control unit for attitude control.

Referring to Fig. 4, the display module in the control unit is used for real-time displaying the infrared image and the position offset and the included angle transmitted by the information processing unit; the lower computer communication module is used for the position offset of the information processing unit and the included angle are transmitted to the upper computer communication module of the control unit; the upper computer communication module is used to receive the information of the lower computer communication module, and sends instruction information to the attitude adjustment module and the lower computer communication module; the attitude adjustment module is used to receive the information of the upper computer The communication module commands information to adjust the attitude. The actual measurement shows that tracking the infrared target through the attitude adjustment module can achieve a tracking bandwidth of 100 Hz, a tracking accuracy of ≤10 mrad, and a resolution of sub-micro radians.

The working principle of the present invention is as follows:

The infrared target obtains the near-infrared, mid-infrared and far-infrared target information of the same scene through the imaging system unit, and transmits the image, spot position and angle information to the information processing unit. From the knowledge of optical geometry, as long as the infrared target is not in the imaging system At the focal length, when the target infrared light deflects a small angle, the center of mass of the spot will move on the imaging surface of the infrared camera; the CCD processing module of the information processing unit obtains the processed infrared image and the spot before and after the movement after image filtering, background segmentation and centroid calculation The size of the position offset, and then through the angle calibration data processing method, the infrared target offset angle can be obtained, and the PSD processing module of the information processing unit also obtains the infrared target offset angle through the angle calibration data processing method; the information processing unit The obtained infrared image and infrared target deviation angle are displayed in real time through the display module of the control unit, and at the same time, the infrared target deviation angle is transmitted to the upper computer information module of the control unit through the lower computer communication module of the control unit; the upper computer information module sends The attitude adjustment command gives the attitude adjustment module to control the corresponding devices to adjust, such as a three-dimensional turntable or a fast mirror, align the system with the infrared target, complete the attitude adjustment, and finally realize the real-time tracking, aiming and detection of the whole system following the infrared target.

Claims (8)

1. multispectral complex detection system, including imaging system unit, information process unit and control unit, it is characterised in that:

The imaging system unit, including near infrared camera, middle infrared camera, far infrared camera, position sensitive detector PSD, quickly Speculum and 7 dry spectroscopes composition, all elements are placed in parallel as three rows, wherein：

First row is sequentially placed the first spectroscope, the second spectroscope, third spectroscope and position sensitive detector PSD from left to right,

Second row is sequentially placed fast mirror, the 4th spectroscope, the 5th spectroscope and near infrared camera from left to right,

Third row is sequentially placed far infrared camera, the 6th spectroscope, the 7th spectroscope and middle infrared camera from left to right,

Fast mirror is opposite with the second spectroscope position, and the 6th spectroscope is opposite with the 4th spectroscope position, the 7th spectroscope It is opposite with the 5th spectroscope position,

The outside of all element entirety is covered with shell, and is set at the shell before the first spectroscope there are one thang-kng window；

Infrared Targets light enters the first spectroscope by thang-kng window, shines the second spectroscope and is divided into two-way a and b, wherein a all the way Enter PSD through third spectroscope, another way b shines the 4th spectroscope through fast mirror and is further divided into two-way b₁And b₂, b all the way₁It is logical It crosses the 6th spectroscope and enters far infrared camera, another way b₂By being further divided into two-way b after the 5th spectroscope₂₁And b₂₂, b all the way₂₁Into Enter near infrared camera, another way b₂₂By infrared camera in entering after the 7th spectroscope, and ensure near infrared camera, in it is infrared The spot center that camera, far infrared camera are formed is in imaging surface center, while ensureing the position angle letter of position sensitive detector PSD Breath is zero.

After 2. system according to claim 1, wherein Infrared Targets light are by thang-kng window incidence, it is ensured that the quick detection in position The position angle information of device PSD is zero, is by adjusting the opposite position of the second spectroscope, third spectroscope and quick detector PSD It sets, height and angle are realized.

After 3. system according to claim 1, wherein Infrared Targets light are by thang-kng window incidence, it is ensured that in near-infrared The spot center that camera, middle infrared camera, far infrared camera are formed is in imaging surface center, is to first pass through the 5th spectroscope of adjustment With the relative position, height and angle of near infrared camera, then relative position, the height of the 7th spectroscope and middle infrared camera are adjusted And angle, the relative position, height and angle of the 6th spectroscope and far infrared camera are finally adjusted to realize.

4. system according to claim 1, which is characterized in that the detecting band of near infrared camera is 0.9-1.7 μm, thang-kng Window bore is >=30mm, pixel dimension ranging from 15-20mm, picture locating depth >=8.

5. system according to claim 1, which is characterized in that the detecting band of middle infrared camera is 2-5 μm, thang-kng window Bore is >=30mm, pixel dimension ranging from 15-20mm, picture locating depth >=8.

6. system according to claim 1, which is characterized in that far infrared camera detecting band is 8-12 μm, thang-kng window Bore is >=30mm, pixel dimension ranging from 15-20mm, picture locating depth >=8.

7. system according to claim 1, which is characterized in that information process unit includes：

CCD processing modules, for the infrared picture that image forming process unit obtains carry out filter make an uproar, background segment, centroid calculation simultaneously Output position offset, angle；

PSD processing modules, the facula position angle information for being obtained to image forming process unit handle and output position is inclined Shifting amount, angle.

8. system according to claim 1, which is characterized in that control unit includes：

Display module, the infrared image obtained for real-time display imaging system unit CCD camera and information process unit processing Obtained position offset, angle；

Slave computer communication module, the host computer for the position offset of information process unit, angle to be passed to control unit Communication module, and receive the host computer communications module instructions information from control unit；

Host computer communication module communicates mould for receiving slave computer communication module information, and to pose adjustment module and slave computer Block sends instructions information；

Pose adjustment module carries out pose adjustment for receiving host computer communications module instructions information.