CN210745357U

CN210745357U - Traffic monitoring device based on non-refrigeration type short wave infrared imaging

Info

Publication number: CN210745357U
Application number: CN201921850064.5U
Authority: CN
Inventors: 贾建鑫; 姚树新; 蒲伟; 郭欣宇; 叶华文; 陈劲松; 韩宇
Original assignee: Shenzhen Institute of Advanced Technology of CAS
Current assignee: Shenzhen Institute of Advanced Technology of CAS
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-06-12
Anticipated expiration: 2029-10-30

Abstract

A traffic monitoring device based on non-refrigeration type short-wave infrared imaging comprises a lens (1), a detector assembly system (2) arranged opposite to the lens (1), a main control subsystem (3) electrically connected with the detector assembly system (2), and a storage and display device (4) electrically connected with the main control subsystem (3), wherein the lens (1) is a short-wave infrared lens, and the wave band range is 0.9-1.7 mu m; the detector component system (2) comprises a detector, wherein the detector adopts an uncooled short-wave infrared high-frame frequency area array detector, and the frame frequency is more than 500 Hz. The utility model discloses can realize the high-speed clear formation of image to surveillance area under the foggy day weather, it is more practical, high-efficient. The utility model discloses not only be applicable to road traffic's control, still be applicable to the marine operation of fog day weather etc.

Description

Traffic monitoring device based on non-refrigeration type short wave infrared imaging

Technical Field

The utility model relates to an infrared imaging technology field especially relates to a traffic monitoring device based on infrared formation of image of non-refrigeration type shortwave.

Background

The information monitoring of the traffic road is the guarantee for the effective management of the road vehicles and is the important basis for processing the traffic accidents. However, there is currently no effective monitoring means to acquire road traffic information in the face of foggy weather. The existing traffic monitoring device still mainly comprises a visible light camera and a camera, and the emergency means for the foggy days comprises early warning, prompting, road closing and the like.

With the development of semiconductor technology, CCD and CMOS visible light imaging systems based on silicon detectors have become the main means for acquiring traffic information. The high frame frequency visible light camera on the highway can accurately measure the driving speed of the vehicle, and promotes the efficient management of the vehicle on the highway. The visible light at the traffic light intersection can clearly shoot passing vehicles, and the method becomes a main means for the current road traffic regulation management. In addition, when the traffic accident is handled, on-site investigation photographing and camera shooting are also needed, and the 'evidence' of the road traffic accident site is fixed, so that important basis is provided for the next step of identification and handling of the road traffic accident. However, visible light imaging systems tend to be greatly affected when subjected to foggy weather conditions.

The short-wave infrared imaging technology has obvious advantages in cloud weather because the short-wave infrared imaging technology has longer wavelength compared with visible light and can bypass solid particles in the cloud to continue to propagate. In addition, the position of the short-wave infrared band is close to visible light, the image information of the target is obtained mainly by collecting the reflection energy of the target to sunlight, and compared with medium-wave infrared and long-wave infrared, the image characteristics of the target are closer to the visual effect of people. Therefore, the characteristics make the short-wave infrared imaging technology a main means for acquiring target information in cloud and fog weather. The short-wave infrared detector is an important element of the technology, and the performance of the short-wave infrared detector directly influences the application effect of the system. The mercury cadmium telluride (HgCdTe) detector has the advantages of high sensitivity and the like, and is a preferred device of a short-wave infrared imaging system for a long time, but the working condition of the mercury cadmium telluride (HgCdTe) detector generally needs a refrigerator for refrigeration, and the price is relatively expensive, so that the popularization and the application in a large range are hindered.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a can solve current road monitoring device based on visible light camera sensitivity is low, the relatively poor traffic monitoring device based on non-refrigeration type shortwave infrared imaging of problem when facing bad weather such as foggy day.

A traffic monitoring device based on non-refrigeration type short wave infrared imaging comprises a lens (1), a detector component system (2) arranged opposite to the lens (1), a main control subsystem (3) electrically connected with the detector component system (2), and a storage and display device (4) electrically connected with the main control subsystem (3),

the lens (1) is a short-wave infrared lens, and the wave band range comprises 0.9-1.7 mu m;

the detector component system (2) comprises a detector, wherein the detector adopts an uncooled short-wave infrared high-frame frequency area array detector, and the frame frequency is more than 500 Hz;

the lens (1) is used for collecting optical signals in a field angle and converging the optical signals to a focal plane of an uncooled short-wave infrared high-frame-frequency area array detector of the detector component system 2; the detector assembly system also converts the received optical signals into analog electric signals, and transmits the analog electric signals to a digital image signal storage area of the main control subsystem (3) after the analog electric signals are acquired and processed and are converted into digital signals through A/D; the main control subsystem (3) is used for carrying out data processing on the digital signals to form images and outputting the images to the storage and display equipment (4) for storage and display.

In a preferred embodiment, the detector control assembly (2) further comprises a driving and collecting processing circuit, wherein the driving and collecting processing circuit adopts a high-speed low-noise circuit; the driving and collecting processing circuit converts the received optical signals into analog electric signals, and the analog electric signals are transmitted to a digital image signal storage area of the main control subsystem (3) after being converted into digital signals through collecting processing and A/D.

In a preferred embodiment, the main control subsystem (3) adopts a DSP, a single chip or an FPGA logic control chip.

In a preferred embodiment, the storage and display device (4) is a PC or an industrial personal computer with a high-speed data interface.

In a preferred embodiment, the detector is an indium gallium arsenide (InGaAs) detector.

In a preferred embodiment, the imaging mode of the lens (1) is to acquire dynamic information of the target in the field angle by the target motion.

In a preferred embodiment, the focal length of the lens is 35mm, the F-number is 1.4, and the field angle is 50.2 °.

In a preferred embodiment, the detector employs eight readout paths, each at a readout rate of 20Mpixels/s, and a maximum frame rate of 500 Hz.

Compared with the existing road traffic monitoring method, the utility model discloses a camera lens (1) is the shortwave infrared camera lens, and the wave band scope contains 0.9-1.7 mu m; detector subassembly system (2) includes the detector, and wherein the detector adopts the infrared high frame frequency area array detector of uncooled shortwave, and the frame frequency is greater than 500Hz, so can realize the clear formation of image of high speed to the surveillance area under the foggy day weather, and is more practical, high-efficient. The utility model discloses not only be applicable to road traffic's control, still be applicable to the marine operation of fog day weather etc.

Drawings

Fig. 1 is the utility model provides a traffic monitoring device's functional block diagram based on infrared formation of image of non-refrigeration type shortwave.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the ordinary skilled person without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the utility model provides a traffic monitoring device 100 based on infrared formation of image of non-refrigeration type shortwave, including camera lens 1, the detector module system 2 that sets up relatively with camera lens 1, the main control subsystem 3 that is connected with detector module system 2 electricity, the storage and display device 4 that is connected with main control subsystem 3 electricity, camera lens 1 is the infrared camera lens of shortwave, and the wave band scope contains 0.9-1.7 μm; the detector component system 2 comprises a detector, wherein the detector adopts an uncooled short-wave infrared high-frame frequency area array detector, and the frame frequency is more than 500 Hz; the lens 1 is used for collecting optical signals in a field angle and converging the optical signals to a focal plane of an uncooled short-wave infrared high-frame-frequency area array detector of the detector component system 2; the detector component system 2 also converts the received optical signals into analog electric signals, and transmits the analog electric signals to a digital image signal storage area of the main control subsystem 3 after the analog electric signals are acquired and processed and are converted into digital signals through A/D; the main control subsystem 3 is used for processing the digital signal to form an image and outputting the image to the storage and display device 4 for storage and display.

The lens 1 of the utility model is a short wave infrared lens, and the wave band range comprises 0.9-1.7 μm; detector subassembly system 2 includes the detector, and wherein the detector adopts the infrared high frame frequency area array detector of uncooled shortwave, and the frame frequency is greater than 500Hz, so can realize the clear formation of image of high speed to the surveillance area under the foggy day weather, and is more practical, high-efficient. The utility model discloses not only be applicable to road traffic's control, still be applicable to the marine operation of fog day weather etc.

In a preferred embodiment, the detector control assembly 2 further comprises a driving and collecting processing circuit, wherein the driving and collecting processing circuit adopts a high-speed low-noise circuit; the driving and collecting processing circuit converts the optical signal received by the detector into an analog electrical signal, and the analog electrical signal is transmitted to a digital image signal storage area of the main control subsystem 3 after being subjected to collecting processing and A/D conversion into a digital signal.

More specifically, the imaging mode of the lens 1 is to acquire dynamic information of an object in a field angle through object motion; the detector is an indium gallium arsenide (InGaAs) detector; the main control subsystem 3 adopts a DSP, a singlechip or an FPGA logic control chip; the storage and display device 4 adopts a PC or an industrial personal computer with a high-speed data interface.

Example (b):

lens 1: and a small F-number lens is selected to enhance light condensation, and other parameters are selected according to the required resolution and observation distance. In the embodiment, a large-field short-wave infrared lens is selected, wherein the focal length is 35mm, the F number is 1.4, the field angle is 50.2 degrees, and the wave band range is 0.9-1.7 μm. For example, a large field short wave IR lens available from OPTEC Italy under the model OB-SWIR35-LF C0411 may be selected.

The probe assembly system 2: and a large-charge gain area array detector is selected, so that the observation performance is improved. In this embodiment, a 1000 × 256InGaAs non-refrigeration short-wave infrared detector is selected. For example, 1000 × 256 indium gallium arsenide (InGaAs) non-refrigeration type short wave infrared detector developed by Shanghai technical and physical research institute of Chinese academy of sciences is selected. The detector adopts eight paths of reading, the reading rate of each path is 20Mpixels/s, and the highest frame frequency is 500 Hz. The driving and collecting processing circuit comprises the steps of providing bias voltage for the detector, collecting and processing analog signals, converting A/D and the like.

The master control subsystem 3: in this embodiment, an FPGA is selected, for example, a Spartan6 series FPGA of Xilinx corporation. The main control subsystem 3 provides driving and collecting time sequence for the detector, finishes the collection and processing of digital signals, stores data and transmits image data to the display equipment.

Storage and display device 4: a PC with a high-speed data interface is selected, and the data communication rate needs to meet the requirement of the image output rate. Assuming a frame frequency of 500Hz in this example, the fastest data rate is: the 1000 × 20 × 16bit × 500Hz is 120Mbit/s, and the data rate is realized by using, for example, a NI6537 interface of a PCI express card from NI corporation.

And (3) calculating the signal-to-noise ratio: according to the optical efficiency of the selected lens, the pixel size of the detector, the high-speed low-noise driving and collecting circuit and other parameters, the signal-to-noise ratio of the traffic monitoring device 100 based on the non-refrigeration type short-wave infrared imaging under the conditions of 5-degree solar altitude angle and 0.2 ground albedo low light is calculated to be about 2004, and the performance and the application effect of the system are guaranteed due to the ultrahigh sensitivity.

The utility model discloses traffic monitoring device 100 based on infrared formation of image of non-refrigeration type shortwave still further includes modules such as power management, computer parameter configuration software, computer data transmission and display software. In this embodiment, the input power supply is DC 28V, and each part is supplied by DC-DC, and the main control subsystem operates the relay to control the on/off of each part. The parameter configuration software is realized on a PC, is written by VS12, is connected to the main control subsystem by the PC through an RS422 communication interface and is responsible for controlling the switch of the detector. The acquisition software is compiled by LabView, and the data transmission interface is a high-speed PCI interface.

According to the optical efficiency of the selected lens, the pixel size of the detector, the high-speed low-noise driving and collecting circuit and other parameters, the signal-to-noise ratio of the imaging system under the conditions of a 5-degree solar altitude angle and 0.2 ground albedo and low light level is calculated to be about 2004, and the performance and the application effect of the system are guaranteed due to the ultrahigh sensitivity.

The above-described embodiments only represent one or several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a traffic monitoring device based on infrared formation of image of non-refrigeration type shortwave, includes camera lens (1), detector subassembly system (2) that set up relatively with camera lens (1), main control subsystem (3) of being connected with detector subassembly system (2) electricity, storage and display device (4) of being connected with main control subsystem (3) electricity, its characterized in that:

the lens (1) is a short wave infrared lens, and the wave band range is 0.9-1.7 mu m;

the lens (1) is used for collecting optical signals in a field angle and converging the optical signals to a focal plane of an uncooled short-wave infrared high-frame-frequency area array detector of the detector component system (2); the detector assembly system (2) is used for converting a received optical signal into an analog electric signal, and transmitting the analog electric signal to a digital image signal storage area of the main control subsystem (3) after the analog electric signal is acquired and processed and is converted into a digital signal through A/D; the main control subsystem (3) is used for carrying out data processing on the digital signals to form images and outputting the images to the storage and display equipment (4) for storage and display.

2. The traffic monitoring device based on non-refrigeration type short-wave infrared imaging is characterized in that the detector assembly system (2) further comprises a driving and collecting processing circuit, and the driving and collecting processing circuit adopts a high-speed low-noise circuit; the driving and collecting processing circuit is used for converting the optical signals received by the detector into analog electric signals, and the analog electric signals are transmitted to a digital image signal storage area of the main control subsystem (3) after being converted into digital signals through collecting processing and A/D.

3. The traffic monitoring device based on non-refrigeration type short-wave infrared imaging according to claim 2, characterized in that the main control subsystem (3) adopts a DSP, a single chip microcomputer or an FPGA logic control chip.

4. Traffic monitoring device according to claim 3, characterized in that said storage and display means (4) are a PC or industrial control computer with a high-speed data interface.

5. The traffic monitoring device based on non-refrigeration type short-wave infrared imaging according to claim 1, characterized in that the detector is an indium gallium arsenide (InGaAs) detector.

6. The traffic monitoring device based on non-refrigeration type short-wave infrared imaging is characterized in that the imaging mode of the lens (1) is to acquire dynamic information of an object in a field angle through object motion.

7. The traffic monitoring device based on non-refrigeration type short-wave infrared imaging is characterized in that the focal length of the lens is 35mm, the F number is 1.4, and the field angle is 50.2 degrees.

8. The traffic monitoring device based on non-refrigeration type short-wave infrared imaging of claim 7, characterized in that the detector adopts eight readout paths, the readout rate of each path is 20Mpixels/s, and the highest frame frequency is 500 Hz.