Active side window-penetrating snapshot infrared imaging device

Abstract

The utility model discloses an active side window-penetrating snapshot infrared imaging device, which solves the problem that the situation in a vehicle is difficult to shoot through a side window film by the existing detection technical means, and specifically comprises a power supply management module, a signal processing module, a laser driving power supply module, a laser and the like, the power supply management module is connected with the signal processing module and the power supply input end of the laser driving power supply module. A first signal receiving end of the signal processing module is connected with an output end of the CMOS image sensor module, and a control end of the signal processing module is connected with the laser driving power supply module; the driving end of the laser driving power supply module is connected with the laser; the laser shaping and emitting optical system is arranged at the emitting end of the laser, and the focal plane of the laser shaping and emitting optical system coincides with the emitting surface of the laser; the receiving end of the receiving optical system is positioned on a reflected light path of the laser passing through the to-be-photographed object; the CMOS image sensor module is arranged at the emergent end of the receiving optical system, and the light-sensitive surface of the CMOS image sensor module coincides with the optimal phase surface of the receiving optical system.

Description

Technical Field

[0001] The utility model relates to an imaging device, in particular to an active side transparent window capturing infrared imaging device. Background Art

[0002] With the continuous development of China's economy and the improvement of personal income levels, the proportion of families owning vehicles is also increasing continuously. Whether in central cities or surrounding townships, private vehicles have gradually entered every household. At the same time, there are also higher requirements for traffic safety detection capabilities, especially in the detection of the number of passengers in the vehicle and the riding environment, which are greatly related to the safety of vehicle driving and the safe and effective rescue in case of accidents. These importances are mainly reflected in the following aspects:

[0003] (1) Overloading of passengers in a vehicle will lead to overloading of the vehicle, increasing the instability during vehicle driving, increasing the vehicle inertia, and lengthening the braking distance;

[0004] (2) When overloading is serious, the load on the vehicle tires increases, which is likely to cause tire blowouts, brake failures, etc.;

[0005] (3) The passengers exceeding the approved number usually have no safety protection measures. In case of an accident, they are likely to form secondary collisions or squeezes, and even be thrown out of the vehicle;

[0006] (4) In case of a collision or rollover accident, when the number of passengers exceeds the rated number, it will bring great difficulties to the escape and rescue work of the passengers;

[0007] (5) Some vehicles are loaded with passengers and goods mixed. In case of sudden braking or a collision accident, the goods will cause harm to the passengers in the vehicle under the action of inertia. Especially in case of a fire or spontaneous combustion accident, the goods may exacerbate the spread and combustion degree of the fire.

[0008] In summary, the transparent window detection of vehicles is an extremely important task. However, since the current traffic checkpoint capturing cameras or surveillance cameras usually only have the function of capturing images from the front under daylight conditions or adding near-infrared LED lighting devices to achieve the function of capturing images from the front at night, it is very difficult to accurately capture the passengers in the vehicle and the riding environment. The main technical problems are as follows:

[0009] (1) Most private vehicles (including sedans, business MPVs, SUVs, and cuboid passenger cars, etc.) usually choose to paste high-transparency vehicle glass protection films on the front windshield, and usually choose high-reflection or dark-colored vehicle glass protection films on the side windows. It is very difficult for existing checkpoint cameras and surveillance cameras to shoot the situation inside the vehicle through these side window films;

[0010] (2) When an LED lamp bead emits light, it is approximately a Lambertian body. Usually, in order to increase the light power during stroboscopic or flickering, multiple LEDs are assembled in an array form and a lens is applied, so that the effective illumination angle can be limited within 60 degrees to 120 degrees. However, its energy concentration is not high and it has no good directivity. Moreover, both sides of most vehicles form a certain angle with the ground. When sunlight or LED stroboscopic light shines on the side windows, most of the light is reflected, making it difficult to illuminate the interior environment of the vehicle and impossible to capture images inside the vehicle.

[0011] (3) When strong sunlight or LED stroboscopic light shines on the side window glass, most of the light is reflected by the outer surface of the car window. A small amount of polarized light that enters the vehicle interior and is reflected again contains valid information, but its amplitude is much smaller than the reflected light on the outer surface of the car window. The capture camera can only capture the reflection scene on the outer surface of the window glass, and even local saturation may occur.

[0012] In summary, for the detection work of penetrating the vehicle window, the existing detection techniques have certain limitations. Summary of the Utility Model

[0013] The purpose of the present utility model is to provide an active side window penetration capture infrared imaging device to solve the technical problem that the existing detection techniques can only capture the reflection scene on the outer surface of the window glass due to the reflection of light by the window, and it is difficult to capture the situation inside the vehicle through the side window film.

[0014] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0015] An active side window penetration capture infrared imaging device, characterized in that it includes a power management module, a signal processing module, a laser driver power module, a laser, a laser shaping and emission optical system, a receiving optical system, and a CMOS image sensor module;

[0016] The power management module is respectively connected to the power input ends of the signal processing module and the laser driver power module;

[0017] The first signal receiving end of the signal processing module is connected to the output end of the CMOS image sensor module, and its control end is connected to the laser driver power module, which is used to receive image information and restore the image, and is also used to control the laser driver power module;

[0018] The driving end of the laser driver power module is connected to the laser;

[0019] The laser is used to emit infrared laser;

[0020] The laser shaping and emitting optical system is arranged at the output end of the laser, and its focal plane coincides with the emitting surface of the laser. It is used to shape and expand the laser emitted by the laser, modulate the laser into polarized light, and emit the polarized light to the object to be photographed;

[0021] The receiving end of the receiving optical system is located on the reflection optical path of the laser passing through the object to be photographed, and is used to receive the reflected laser and converge the received reflected laser;

[0022] The CMOS image sensor module is arranged at the output end of the receiving optical system, and its photosensitive surface coincides with the optimal phase surface of the receiving optical system. It is used for imaging and transmitting the corresponding image information to the signal processing module.

[0023] Furthermore, a microlens array is further included;

[0024] The microlens array is arranged on the optical path between the receiving optical system and the CMOS image sensor module, and is used to screen polarized light.

[0025] Furthermore, a transmitting window is further included;

[0026] The transmitting window is arranged at the output end of the laser shaping and emitting optical system, and an antireflection film with a transmittance greater than or equal to 98% in the wavelength band of 700 - 1100 nm is coated on its surface.

[0027] Furthermore, a receiving window is further included;

[0028] The receiving window is arranged at the receiving end of the receiving optical system and is located on the optical path of the laser reflected by the object to be photographed. An antireflection film with a transmittance greater than or equal to 90% in the wavelength band of 700 - 1100 nm is coated on its surface.

[0029] Furthermore, a vehicle detection module is further included;

[0030] The output end of the vehicle detection module is connected to the second signal receiving end of the signal processing module, and is used to detect the position of the object to be measured.

[0031] Furthermore, a waterproof protective cover is further included;

[0032] The power management module, the signal processing module, the laser driver power module, the laser, the laser shaping and emitting optical system, the receiving optical system, and the CMOS image sensor module are all arranged inside the waterproof protective cover;

[0033] The transmitting window and the receiving window are respectively embedded on the side wall of the waterproof protective cover;

[0034] The vehicle detection module is located outside the waterproof protective cover and is respectively connected to the power management module and the signal processing module through waterproof connectors embedded on the side wall of the waterproof protective cover.

[0035] Further, the laser is a vertical cavity surface emitting laser;

[0036] The average power of the vertical cavity surface emitting laser is less than or equal to 5 mW, meeting the Class Ⅱ safety level.

[0037] Further, the emission window and the reception window are respectively installed on the side wall of the waterproof protective cover through retaining rings; anti-loosening sealant is injected around the retaining rings.

[0038] Further, the waterproof level of the waterproof connector is greater than or equal to IP67.

[0039] Further, the power management module is respectively connected to the signal processing module, the laser driver power module, and the waterproof connector through flexible silicone wires;

[0040] The signal processing module is connected to the laser driver power module through a flexible silicone wire, connected to the CMOS image sensor module of the signal processing module through a high-speed USB bus, and connected to the waterproof connector through a network cable above gigabit;

[0041] The waterproof connector is connected to the vehicle detection module through a network cable;

[0042] The vehicle detection module is a detection sensor or a radar or a front bayonet capture camera.

[0043] Advantages of the present utility model:

[0044] 1. The present utility model adopts laser active illumination in the near-infrared band. Utilizing its high energy concentration and directivity, the light can smoothly pass through the vehicle window, providing a necessary condition for the realization of the function of capturing images through the window.

[0045] 2. The present utility model adopts a vertical cavity surface emitting laser, and uses a laser shaping and emission optical system to increase the irradiation range of the laser, capable of shaping the spot shape and modulating the laser into a single-direction polarized light.

[0046] 3. The present utility model applies a microlens array between the receiving optical system and the CMOS image sensor module, capable of screening out polarized light in four directions related only to the polarization state of the modulated laser, removing interfering light, and improving the imaging quality.

[0047] 4. The average power of the vertical cavity surface emitting laser adopted in the present utility model is not greater than 5 mW, meeting the Class Ⅱ safety level, and capable of avoiding harm to human eyes.

[0048] 5. The present utility model can adjust the laser working time and exposure time through the signal processing module, and can adapt to scenarios with different vehicle speeds.

[0049] 6. The utility model adopts a vehicle detection module to detect incoming vehicles. A vehicle detection radar or a front bayonet capture camera can also be used to replace the detection module to achieve the same function and reduce the cost in actual use scenarios.

[0050] 7. The optical and electronic devices designed in this utility model meet the use requirements of -40℃~+85℃; its mechanical structure, optical interface, cable and connector are well waterproof and sealed, and the whole machine can reach IP67 waterproof level, which can meet the requirements of long-term outdoor use. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 The utility model is a structural schematic diagram of an active side-through-window capture infrared imaging device embodiment.

[0052] Figure Number:

[0053] 1-power management module, 2-signal processing module, 3-laser driving power module, 4-laser, 5-laser shaping and emission optical system, 6-emission window, 7-receiving window, 8-receiving optical system, 9-microlens array, 10-CMOS image sensor module, 11-waterproof connector, 12-waterproof protective cover, 13-vehicle detection module. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings and embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0055] The present invention provides an active side-through-window infrared imaging device, such as Figure 1As shown, the imaging device is composed of a power management module 1, a signal processing module 2, a laser driving power module 3, a laser 4, a laser shaping and emitting optical system 5, an emitting window 6, a receiving window 7, a receiving optical system 8, a microlens array 9, a CMOS image sensor module 10, a waterproof connector 11, a waterproof protective cover 12 and a vehicle detection module 13. Among them, the power management module 1, the signal processing module 2, the laser driving power module 3, the laser 4, the laser shaping and emitting optical system 5, the receiving optical system 8, the microlens array 9 and the CMOS image sensor module 10 are installed inside the waterproof protective cover 12; the power management module 1, the signal processing module 2, the laser driving power module 3, the laser 4 and the CMOS image sensor module 10 are firmly installed on the bottom plate of the waterproof protective cover 12 by screws; the power management module 1 is connected to the signal processing module 2 and the laser driving power module 3 by a flexible silicone wire; the laser driving power module 3 is connected to the waterproof protective cover 12 by a flexible silicone wire. The silicone wire is connected to the laser 4; the laser shaping and emitting optical system 5 is rigidly connected to the laser 4 through a threaded structure, and its focal plane coincides with the emitting surface of the laser 4. The laser 4 adopts a vertical cavity surface emitting laser, and its average power is not more than 5mW, which meets the Class II safety level; the emitting window 6 is installed at the front end of the waterproof protective cover 12 through a pressing ring, and its surface is coated with an anti-reflection film so that its transmittance in the 700-1100nm (such as 780nm, 808nm, 850nm, 940nm) band is not less than 98%, and anti-loosening sealant is injected around the pressing ring to isolate water vapor and prevent loosening The receiving window 7 is installed at the front end of the waterproof protective cover 12 through a pressing ring, and its surface is coated with an anti-reflection film, and the transmittance in the 700-1100nm band is not less than 90%, and anti-loosening sealant is injected around the pressing ring to isolate water vapor and prevent loosening; the microlens array 9 is installed at the front end of the photosensitive surface of the CMOS image sensor module 10 through a pressing ring; the receiving optical system 8 is connected to the image sensor module 10 through a threaded structure, and the best phase surface coincides with the photosensitive surface of the CMOS image sensor module 10; the CMOS image sensor module 10 is connected to the signal processing module 2 through a high-speed USB bus; the anti- The water connector 11 and the waterproof protective cover 12 are installed through the wall. There is a waterproof sealing ring and sealant at the installation location. The waterproof connector 11 is connected to the power management module 1 through a silicone soft cable inside the waterproof protective cover 12, connected to the signal processing module 2 through a gigabit network cable, and then connected to the vehicle detection module 13 through a network cable. At this time, the power management module 1 can obtain electricity from the outside of the waterproof protective cover 12 through the waterproof connector 11 and the vehicle detection module 13, and supply power to the signal processing module 2 and the laser drive power module 3 after voltage conversion processing; the waterproof connector 11 has a waterproof rating of IP67. The vehicle detection module 13 detects the incoming vehicle, and the vehicle detection radar or the front bayonet capture camera can also be used to replace the detection module to achieve the same function.

[0056] The working process of the imaging device is introduced below with a vehicle as the object to be photographed:

[0057] S1. Place the imaging device at a distance of 4 - 6 meters from the lane of the vehicle to be captured, with the emission window 6 and the reception window 7 facing the side of the moving vehicle. Set the signal processing module 2 according to the average vehicle speed, sunlight intensity, etc. of the vehicles traveling on the road. The setting items include exposure time, gain, etc.;

[0058] S2. Power on the imaging device. The power management module 1 completes the power conversion work, provides the required DC5V, DC3.3V, etc. to the signal processing module 2, and provides the required 2.5V to the laser driver power module 3. After the signal processing module 2 completes the function self - check work, it prohibits the output of the laser driver power module 3 and turns off the exposure of the CMOS image sensor module 10;

[0059] S3. When the vehicle detection module 13 detects the approach of a vehicle, it detects its traveling speed and approaching distance. When the vehicle is about to enter the edge of the shooting field of view of the CMOS image sensor module 10, it sends the synchronous trigger information to the signal processing module 2 through a gigabit - or - above network cable passing through the waterproof connector 11;

[0060] S4. After receiving the synchronous trigger information, the signal processing module 2 enables the output of the laser driver power module 3 and simultaneously sends an exposure control signal;

[0061] S5. The laser driver power module 3 operates in a constant - current mode and has the ability to instantaneously release a current greater than 8A within a short period of time, thereby driving the vertical - cavity surface - emitting laser 4 to emit infrared laser with a wavelength band of 850nm ± 10nm and an average power ≤ 5mW;

[0062] S6. After the vertical - cavity surface - emitting laser 4 is shaped and expanded by the laser shaping and emission optical system 5, the laser divergence angle is not less than ±30°, and it is modulated into polarized light with a specific polarization state;

[0063] S6. The shaped laser irradiates the side of the vehicle through the emission window 6, penetrates the side window of the vehicle to illuminate the interior of the vehicle and is reflected;

[0064] S7. After passing through the reception window 7, only the infrared light in the wavelength band of 700 - 1100nm of the reflected polarized light, natural light, natural reflected light, etc. inside the vehicle enters the reception field of view of the device;

[0065] S8. The receiving optical system 8 converges the received infrared light. Before the converged light reaches the photosensitive surface of the CMOS image sensor module 10, the microlens array 9 filters out the polarized light in four directions related only to the polarization state of the modulated laser, further removing the interfering light. Then, the polarized light passing through the microlens array 9 covers the photosensitive surface of the CMOS image sensor module 10 and forms an image.

[0066] S9. The CMOS image sensor module 10 stops exposure and transmits the image information to the signal processing module 2 through the high-speed USB bus.

[0067] S10. The signal processing module 2 establishes a Stokes vector model for each group of polarized images, restores the information image of the polarized light inside the vehicle, and stores or uploads it. The Stokes vector model is as follows:

[0068]

[0069] In the formula, S0 represents the total intensity of the reflected light; S1 represents the difference in the light intensity of the polarization components at 0° and 90°; S2 represents the difference in the polarization component intensities in the 45° direction and the 135° direction; S3 represents the right-handed circularly polarized light component.

[0070] When a new vehicle drives into the capture view range, repeat steps (3) to (13).

[0071] Through actual road tests in this embodiment, the success rate of side window capture is greater than 76%, and it can clearly determine whether the number of passengers in the vehicle is overloaded or there is a situation of mixed passenger and cargo, providing a new effective technical means for traffic safety monitoring.

[0072] In this embodiment, by modulating the near-infrared laser and actively illuminating the vehicle side window, with its high energy concentration and good directivity, it can smoothly pass through the side window, and the receiving optical system is used to collect the reflected polarized light. After the reflected light realizes polarization demodulation through the microlens array, it is converged at the focal plane position through the optical system. A CMOS sensor with good response in the near-infrared band is applied at the focal plane position, so that the collected reflected light can effectively cover the target surface of the image sensor. The image output by the image sensor forms a Stokes vector model in the signal processing system, only identifying the polarization information related to the emitted polarized laser, thereby effectively reducing the influence of a large amount of emitted light on the outer surface of the window glass on imaging, and well realizing the shooting of the people and the riding environment inside the vehicle. This device can be fixedly installed on the side of a certain fixed road or temporarily placed on the side of a certain road as a temporary detection means, and the usage scenario is flexible.

[0073] In addition, the laser output by the designed laser emission system complies with the Class II safety level, which can avoid harm to human eyes. The designed optical and electronic devices meet the usage requirements of -40°C to +85°C; the designed mechanical structure, optical interface, cables, and connectors are treated with good waterproof and sealing, and can reach the IP67 waterproof level, thus meeting the requirements for long-term outdoor installation and use.

[0074] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. An active side-through-window infrared imaging device, characterized in that: It comprises a power management module (1), a signal processing module (2), a laser driving power module (3), a laser (4), a laser shaping and transmitting optical system (5), a receiving optical system (8) and a CMOS image sensor module (10); The power management module (1) is respectively connected to the power input terminals of the signal processing module (2) and the laser driving power module (3); The first signal receiving end of the signal processing module (2) is connected to the output end of the CMOS image sensor module (10), and the control end is connected to the laser driving power supply module (3), and is used to receive image information and restore the image, and is also used to control the laser driving power supply module (3); The driving end of the laser driving power module (3) is connected to the laser (4); The laser (4) is used to emit infrared laser; The laser shaping and emission optical system (5) is arranged at the emission end of the laser (4), and its focal plane coincides with the emission surface of the laser (4), and is used to shape and expand the laser light emitted by the laser (4), and modulate the laser light into polarized light, and emit the polarized light to the object to be photographed; The receiving end of the receiving optical system (8) is located on the reflected light path of the laser beam passing through the object to be photographed, and is used to receive the reflected laser beam and converge the received reflected laser beam; The CMOS image sensor module (10) is arranged at the output end of the receiving optical system (8), and its photosensitive surface coincides with the optimal phase plane of the receiving optical system (8), and is used for imaging and transmitting corresponding image information to the signal processing module (2).

2. The active side window capture infrared imaging device according to claim 1, characterized in that: Also includes a microlens array (9); The microlens array (9) is arranged on the optical path between the receiving optical system (8) and the CMOS image sensor module (10) and is used to screen polarized light.

3. The active side window capture infrared imaging device according to claim 1 or 2, characterized in that: Also includes a launch window (6); The emission window (6) is arranged at the emission end of the laser shaping and emission optical system (5), and its surface is coated with an anti-reflection film with a transmittance greater than or equal to 98% in the 700-1100nm band.

4. The active side window capture infrared imaging device according to claim 3, characterized in that: Also includes a receiving window (7); The receiving window (7) is arranged at the receiving end of the receiving optical system (8) and is located on the optical path of the laser reflected by the object to be photographed. Its surface is coated with an anti-reflection film with a transmittance greater than or equal to 90% in the 700-1100nm band.

5. The active side window capture infrared imaging device according to claim 4, characterized in that: Also includes a vehicle detection module (13); The output end of the vehicle detection module (13) is connected to the second signal receiving end of the signal processing module (2) and is used to detect the position of the object to be detected.

6. The active side window capture infrared imaging device according to claim 5, characterized in that: Also includes a waterproof protective cover (12); The power management module (1), the signal processing module (2), the laser driving power module (3), the laser (4), the laser shaping and transmitting optical system (5), the receiving optical system (8) and the CMOS image sensor module (10) are all arranged in a waterproof protective cover (12); The transmitting window (6) and the receiving window (7) are respectively embedded in the side walls of the waterproof protective cover (12); The vehicle detection module (13) is located outside the waterproof protective cover (12), and is respectively connected to the power management module (1) and the signal processing module (2) via a waterproof connector (11) embedded on the side wall of the waterproof protective cover (12).

7. The active side-through-window infrared imaging device according to claim 6, characterized in that: The laser (4) is a vertical cavity surface emitting laser; The average power of the vertical cavity surface emitting laser is less than or equal to 5mW, which meets the Class II safety level.

8. The active side-through-window infrared imaging device according to claim 6, characterized in that: The transmitting window (6) and the receiving window (7) are respectively embedded in the side wall of the waterproof protective cover (12) through a pressing ring; and anti-loosening sealing glue is injected around the pressing ring.

9. The active side-through-window infrared imaging device according to claim 8, characterized in that: The waterproof grade of the waterproof connector (11) is greater than or equal to IP67.

10. The active side-through-window infrared imaging device according to claim 9, characterized in that: The power management module (1) is respectively connected to the signal processing module (2), the laser driving power module (3) and the waterproof connector (11) via flexible silicone wires; The signal processing module (2) is connected to the laser driving power module (3) via a flexible silicone wire, connected to the signal processing module CMOS image sensor module (10) via a high-speed USB bus, and connected to the waterproof connector (11) via a gigabit or higher network cable; The waterproof connector (11) is connected to the vehicle detection module (13) via a network cable; The vehicle detection module (13) is a detection sensor or a radar or a front-mounted capture camera.

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