Split type high-speed monitoring system and method for high-risk explosion environment

Abstract

In order to solve the technical problems of trigger delay, insufficient frame rate and storage architecture defects of traditional monitoring equipment, low data extraction efficiency and difficult to guarantee the security of storage medium of existing high-speed camera system, the split type high-speed monitoring system and method in high-risk explosion environment are disclosed, wherein the monitoring system comprises a monitoring unit, a collection and storage unit and a data transmission unit; the monitoring unit is located in the monitoring scene, the collection and storage unit is located outside the monitoring scene, and the two are connected through the data transmission unit; the monitoring unit comprises an explosion-proof shell, a trigger module, an imaging module and an electric control module located in the explosion-proof shell; the trigger module monitors the target area and collects the light signal and / or shock wave pressure signal generated by burning, burning or explosion, and then converts it into a trigger electric signal and transmits it to the electric control module; the electric control module controls the imaging module to shoot the image of the target area, and transmits the image data to the collection and storage unit for storage through the data transmission unit.

Description

TECHNICAL FIELD

[0001] The present application relates to a safety monitoring system and method, in particular to a split type high-speed monitoring system and method for high-risk explosion environment. BACKGROUND

[0002] In high-risk industrial environments such as chemical production, energy storage and transportation, and metal processing, explosion accidents are prone to occur. Explosion accidents have the characteristics of strong suddenness, rapid development, and great destructive power. They can often evolve from initial abnormalities to disastrous consequences within a time scale of milliseconds. Therefore, while focusing on safety production, it is also necessary to improve safety monitoring awareness and prevent explosion accidents.

[0003] Existing safety monitoring systems mainly rely on traditional monitoring devices and high-speed camera systems. Among them, the traditional monitoring device is represented by an industrial-grade security camera. Its structure is mainly designed for daily monitoring needs, and has three key technical defects: First, in terms of time resolution, traditional monitoring devices generally use a fixed frame rate of 25-30 fps, with a single frame interval of 33-40 ms. However, the initial signs of a typical explosion accident (such as local overheating and gas leakage) can develop into an irreversible explosion process within 1-5 ms, making it impossible for such monitoring devices to capture key image data at the initial stage of the accident. Second, in terms of triggering mechanism, traditional monitoring devices rely on software polling or simple threshold triggering, with a response delay of up to 200-500 ms. When the sensor detects an anomaly, the accident has often entered the stage of intense burning. Third, the exposure time and gain adjustment of traditional monitoring devices lag behind, making them prone to oversaturation when facing high-intensity flashes, resulting in images with only white noise and a loss of detail information. More seriously, the integrated storage architecture of traditional monitoring devices relies on local storage chips or real-time network transmission (such as RJ45 bus), which is easily damaged by physical damage or network interruption under the action of explosion shock waves, resulting in permanent loss of key data. As can be seen, traditional monitoring devices are limited by slow response speed, triggering delay, insufficient frame rate, and storage architecture defects, making it difficult to record key image data at the initial stage of the accident, resulting in a lack of direct visual evidence for accident investigation.

[0004] Although the high-speed camera system (such as a thousand frames / million frames level scientific camera) solves the problem of time resolution of the traditional monitoring device to a certain extent, its implementation also brings a new application bottleneck: the high-speed camera system usually adopts CMOS global shutter or CCD scanning technology, although the highest frame rate can reach 1000~100000fps, but the explosion accident needs to be recorded all the time, and the high-speed camera system will produce TB level massive data in single collection, which not only causes waste of storage resources, but also leads to low efficiency of effective data extraction. In addition, the high-speed camera system generally adopts centralized storage architecture, even if the industrial grade protective shell is used, it is still difficult to guarantee the safety of the storage medium in the extreme scene such as chemical explosion. At the same time, the existing high-speed camera system generally lacks fast triggering and hierarchical storage mechanism, and cannot realize the intelligent switching of "normal low-power monitoring-high-speed recording in abnormal situation", which further limits its use value in long-term unattended scene.

[0005] In summary, it is urgent to develop a transient image monitoring system with microsecond level triggering, high frame rate imaging and safe storage, which directly restores the key dynamic characteristics at the moment of event occurrence, provides irreplaceable objective evidence support for accurate determination of accident causes, responsibility division and improvement of preventive measures. SUMMARY

[0006] The purpose of the present application is to solve the technical problems that the traditional monitoring device is limited by triggering delay, insufficient frame rate and storage architecture defects, leading to lack of direct visual evidence for accident investigation, and the existing high-speed camera system has massive data storage pressure, insufficient storage safety in extreme environment and lack of fast triggering mechanism, and provide a split type high-speed monitoring system and method for high-risk explosion environment.

[0007] To achieve the above purpose, the technical solution provided by the present application is:

[0008] A split type high-speed monitoring system for high-risk explosion environment, characterized in that it comprises a monitoring unit, a collection and storage unit and a data transmission unit;

[0009] The monitoring unit is located in the monitoring scene and comprises an explosion-proof shell, and a triggering module, an imaging module and an electric control module installed in the explosion-proof shell;

[0010] The triggering module and the imaging module are connected with the electric control module respectively, the triggering module has a microsecond level triggering function, is used for monitoring a target area and collecting light signals and / or shock wave pressure signals generated by burning, burning or explosion of the target area, and then converts the signals into triggering electrical signals and transmits them to the electric control module;

[0011] The electric control module is a control module based on FPGA hardware architecture, used for receiving a trigger signal and controlling the imaging module to work; the imaging module is used for taking an image of a target area and transmitting image data to the electric control module;

[0012] The collection storage unit is located outside the monitoring scene; the input end of the data transmission unit is connected with the electric control module, and the output end is connected with the collection storage unit; the electric control module transmits the image data to the collection storage unit through the data transmission unit for storage.

[0013] Further, the trigger module comprises an ultraviolet photoelectric trigger module and an explosion pressure trigger module arranged in sequence;

[0014] The ultraviolet photoelectric trigger module comprises a trigger lens and an ultraviolet photoelectric sensor; the trigger lens is used for collecting and converging light signals emitted from the target area; the input end of the ultraviolet photoelectric sensor is located at the image plane position of the trigger lens, and the output end is connected with the electric control module; the ultraviolet photoelectric sensor is used for collecting the light signals converged by the trigger lens and converting them into corresponding trigger signals and then transmitting them to the electric control module;

[0015] The explosion pressure trigger module is an explosion pressure sensor, and the output end thereof is connected with the electric control module; the explosion pressure sensor is used for monitoring the target area and capturing the shock wave pressure signal of the target area, and then converting the shock wave pressure signal into a corresponding trigger signal and transmitting the trigger signal to the electric control module.

[0016] Further, the ultraviolet photoelectric trigger module further comprises an optical filter between the trigger lens and the ultraviolet photoelectric sensor; the optical filter is a narrow-band optical filter, used for transmitting ultraviolet light in the light signals.

[0017] Further, the trigger lens is an ultra-wide-angle lens;

[0018] The spectral response range of the ultraviolet photoelectric sensor is 190nm~1000nm, the response frequency is >1GHz, and the trigger signal rising time is <1μs;

[0019] The center wavelength of the optical filter is selected from the range of 200~400nm, the full width at half maximum is ≤10nm, and the cut-off range optical density OD avg ≥4;

[0020] The trigger signal rising time of the explosion pressure sensor is ≤1μs.

[0021] Further, the explosion-proof housing is a cylindrical structure, comprising a front cover, a main shell and a rear cover; two ends of the main shell are connected with the front cover and the rear cover respectively, and the connection is sealed; a central area of the front cover is provided with an observation window, and the rear cover is provided with an explosion-proof Luer connector; the ultraviolet photoelectric trigger module, the explosion pressure trigger module, the imaging module and the electric control module are all located in the main shell, and the detection surfaces of the ultraviolet photoelectric trigger module, the explosion pressure trigger module and the imaging module are all arranged close to the observation window; the input end of the data transmission unit is connected with the electric control module through the explosion-proof Luer connector.

[0022] Further, it also comprises a dust brush assembly, a dust cover and a mounting bracket.

[0023] The dust brush assembly comprises a brush rod and a windshield wiper motor; the windshield wiper motor is installed at the bottom of the main shell close to the front cover, and the output end of the windshield wiper motor is connected with the brush rod; the brush rod is located outside the front cover, and is provided with brush hairs; the brush rod swings back and forth under the drive of the windshield wiper motor to clean the observation window.

[0024] The dust cover is located at the top of the main shell, and the mounting bracket is located at the bottom of the main shell; the mounting bracket comprises a bracket, a pitch bracket and an azimuth bracket; the bracket is fixedly connected with the bottom of the main shell, the top of the pitch bracket is fixedly connected with the bracket, and the bottom is movably connected with the top of the azimuth bracket; the bottom of the azimuth bracket is used for movably installing in the monitoring scene through the installation adjusting groove.

[0025] Further, the imaging module has an external trigger function, and has a highest monitoring frame rate of ≥1000fps, an image resolution of ≥1920*1080 and a shortest exposure time of ≤1μs.

[0026] Further, the data transmission unit supports CoaXPress protocol and provides a single 12.5Gbps data transmission rate.

[0027] The acquisition and storage unit comprises an image acquisition card and an upper computer; the image acquisition card adopts a CoaXPress image acquisition card, the input end of which is connected with the data transmission unit, and the output end of which is connected with the upper computer, for acquiring the image data transmitted by the data transmission unit and outputting to the upper computer for storage.

[0028] The application provides a split type high-speed monitoring method for high-risk explosion environment, which adopts a daily standby and trigger storage mode, and comprises the following steps:

[0029] Step 1: Assemble the above-mentioned split high-speed monitoring system for high-risk explosion environment, set the trigger threshold of the trigger module and the imaging parameter of the imaging module in advance according to the monitoring requirements, and install the monitoring unit in the monitoring scene, so that the trigger module and the imaging module face the target area; the trigger threshold includes the trigger threshold of light intensity and shock wave pressure; the imaging parameter includes exposure time, image resolution and monitoring frame rate, wherein the monitoring frame rate is not less than 1000 fps;

[0030] Step 2: The target area is continuously monitored by the trigger module, and when the light intensity and / or shock wave pressure of the target area is greater than or equal to the corresponding trigger threshold, the light signal and / or shock wave pressure signal of the target area is converted into a trigger electrical signal by the trigger module and then transmitted to the electrical control module, and the imaging module is started to shoot by the electrical control module;

[0031] Step 3: The image of the target area is shot by the imaging module, and the image data is transmitted to the acquisition storage unit in sequence through the electrical control module and the data transmission unit for storage, thereby realizing the split high-speed monitoring in high-risk explosion environment.

[0032] In addition, the present application also provides another split high-speed monitoring method for high-risk explosion environment, which adopts daily cache and trigger storage mode, comprising the following steps:

[0033] Step 1: Assemble the above-mentioned split high-speed monitoring system for high-risk explosion environment, set the trigger threshold of the trigger module, the imaging parameter of the imaging module, and the storage time window of the acquisition storage unit in advance according to the monitoring requirements, and place the monitoring unit in the monitoring scene, so that the trigger module and the imaging module face the target area; the trigger threshold includes the trigger threshold of light intensity and shock wave pressure; the imaging parameter includes exposure time, image resolution and monitoring frame rate, wherein the monitoring frame rate is not less than 1000 fps; the storage time window is n seconds before triggering and m seconds after triggering, and n and m are both greater than or equal to 0;

[0034] Step 2: The target area is continuously monitored by the trigger module, and the image of the target area is continuously shot by the imaging module, and the image data is transmitted to the acquisition storage unit in real time through the electrical control module and the data transmission unit for cyclic cache, so as to meet the daily monitoring display requirement;

[0035] Step 3: When the light intensity and / or shock wave pressure of the target area is greater than or equal to the corresponding trigger threshold, the light signal and / or shock wave pressure signal of the target area is converted into a trigger electrical signal by the trigger module and then transmitted to the electrical control module;

[0036] Step 4: The electric control module controls the acquisition storage unit to perform a triggered storage operation according to a storage time window, so that high-speed monitoring in a split mode in a high-risk explosion environment is realized; the triggered storage operation refers to extracting image data photographed from n seconds before triggering to m seconds after triggering from the circular cache, and finally integrating and storing the image data in the storage time window in chronological order.

[0037] Compared with the prior art, the present application has the following advantages:

[0038] 1. The present application is a high-speed monitoring system in a split mode in a high-risk explosion environment, comprising a monitoring unit, an acquisition storage unit and a data transmission unit, wherein the monitoring unit is located in a monitoring scene, the acquisition storage unit is located outside the monitoring scene, and the two are communicatively connected through the data transmission unit, so that a split architecture of "near-end acquisition-remote storage" is realized, high-speed monitoring of the on-site transient time and safe storage of the back-end data are realized through spatial separation deployment, and the present application is especially suitable for extreme scenes such as chemical explosion and metal dust explosion, and provides direct data support for accident process reconstruction.

[0039] 2. The trigger module of the present application comprises an ultraviolet photoelectric trigger module and an explosion pressure trigger module, wherein the ultraviolet photoelectric trigger module comprises a trigger lens and an ultraviolet photoelectric sensor, the trigger lens adopts a super wide-angle lens, and can realize coverage of a monitoring area with a super wide viewing angle; the ultraviolet photoelectric sensor adopts a photoelectric sensor responding to a microsecond-level rising edge in an ultraviolet spectrum, can quickly capture a light signal to trigger the imaging module to take pictures and store data when a high-risk explosion accident occurs, and effectively solves the problem that the monitoring equipment cannot capture key image data in the accident process due to slow trigger response speed.

[0040] 3. The monitoring unit of the present application is protected by a flameproof shell, so that ignition sources such as electric sparks and high-temperature surfaces that may be generated inside the shell cannot ignite the external dangerous environment, and the safety of use is ensured.

[0041] 4. The installation angle of the flameproof shell can be adjusted through the mounting bracket, so that the effectiveness of image acquisition is ensured.

[0042] 5. The dust brush assembly of the present application can ensure the cleanliness of the observation window, and if dust and other substances cover the observation window in the case of explosion, the observation window can be cleaned through the dust brush assembly, so that the clarity of image shooting is ensured and the accuracy of later accident analysis is improved.

[0043] 6. The highest monitoring frame rate of the imaging module in the present application is ≥1000fps, the data transmission unit supports a CoaXPress high-speed communication protocol, and provides a data transmission rate of 12.5Gbps per channel, so that the rapid acquisition and high-speed transmission of the instantaneous images of the explosion accident after triggering are ensured.

[0044] 7、The present application can provide millisecond-level space-time precision image evidence chain for sudden combustion and explosion safety accident investigation through the cooperation of the monitoring unit, the acquisition and storage unit and the data transmission unit, and can record continuous visual evidence from abnormal signs to the evolution of the situation in high-risk combustion and explosion accidents, thereby breaking through the technical obstacles of the “key data black window period” of conventional monitoring equipment.

[0045] 8、The present application is a split type high-speed monitoring method for high-risk combustion and explosion environments, which can select daily standby, trigger storage mode or daily cache, trigger storage mode according to monitoring needs, has a wider application range, and has important practical significance for collecting early images of combustion and explosion accidents and improving accident traceability accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of a split type high-speed monitoring system for high-risk combustion and explosion environments according to the present application.

[0047] Figure 2 FIG. 2 is a structural schematic diagram of a monitoring unit in an embodiment of a split type high-speed monitoring system for high-risk combustion and explosion environments according to the present application.

[0048] Figure 3 FIG. 3 is an internal structural schematic diagram of a monitoring unit in an embodiment of a split type high-speed monitoring system for high-risk combustion and explosion environments according to the present application.

[0049] Figure 4 FIG. 4 is a structural schematic diagram of an explosion-proof shell in an embodiment of a split type high-speed monitoring system for high-risk combustion and explosion environments according to the present application.

[0050] Figure 5 FIG. 5 is a structural schematic diagram of a mounting bracket in an embodiment of a split type high-speed monitoring system for high-risk combustion and explosion environments according to the present application.

[0051] The reference signs are explained as follows:

[0052] 1-monitoring unit, 2-acquisition and storage unit, 3-data transmission unit, 4-explosion-proof shell, 41-front cover, 42-main shell, 43-rear cover, 44-viewing window, 45-explosion-proof gland interface, 46-dust cover, 47-mounting bracket, 471-bracket, 472-pitch frame, 473-azimuth frame, 48-brush rod, 5-trigger module, 51-ultraviolet photoelectric trigger module, 511-trigger lens, 512-ultraviolet photoelectric sensor, 513-optical filter, 52-explosion pressure trigger module, 6-imaging module, 7-electronic control module. DETAILED DESCRIPTION

[0053] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment addresses the key issues of traditional monitoring equipment's inability to keep up with trigger delays, unclear image acquisition, and insufficient data storage due to the typical characteristics of combustion and explosion accidents, such as millisecond-level transient evolution, violent energy release, and chain-like destructive effects. It provides a split-type high-speed monitoring system for high-risk combustion and explosion environments. The monitoring system adopts a modular design and includes a monitoring unit 1, an acquisition and storage unit 2, and a data transmission unit 3.

[0056] This embodiment focuses on monitoring hazardous areas / operations in a chemical plant. Based on this scenario, monitoring unit 1 is placed within the monitoring area, while data acquisition and storage unit 2 is placed outside the monitoring area. The two are physically connected via data transmission unit 3. Data transmission unit 3 uses the CoaXPress (CXP) protocol and connects via high-speed coaxial cable or fiber optic cable (requiring a converter). It provides scalable transmission bandwidth of 6.25Gbps to 25Gbps per link, with cable lengths reaching hundreds of meters, ensuring real-time transmission and physical isolation of high-definition image data with millisecond-level latency. Monitoring unit 1 and data acquisition and storage unit 2 are connected via data transmission unit 3 to achieve daily monitoring, image data transmission and storage of hazardous areas / operations in the chemical plant, as well as rapid triggering, image acquisition, high-speed transmission of image data, and secure storage in the event of an accident.

[0057] like Figure 2 and Figure 3 As shown, the external dimensions of monitoring unit 1 are 349mm × 203mm × 336.5mm. Of course, the specific dimensions can be designed according to the actual application scenario. Monitoring unit 1 includes an explosion-proof housing 4, and a trigger module 5, an imaging module 6, and an electronic control module 7 installed inside the explosion-proof housing 4. The trigger module 5 and the imaging module 6 are respectively connected to the electronic control module 7. The trigger module 5 has a microsecond-level triggering function, which is used to monitor the target area and collect the light signals and / or shock wave pressure signals generated by accidents such as combustion, explosion, and ignition in the target area, and then convert them into trigger electrical signals and transmit them to the electronic control module 7.

[0058] Specifically, the trigger module 5 includes an ultraviolet photoelectric trigger module 51 and an explosion pressure trigger module 52; the ultraviolet photoelectric trigger module 51 includes a trigger lens 511, a filter 513 and an ultraviolet photoelectric sensor 512 arranged in sequence, wherein the trigger lens 511 is an ultra-wide-angle lens with a large field of view angle, which is used to collect and converge the light signals emitted from the target area, so as to realize the coverage of the monitoring area with a super-wide view angle. The filter 513 is a narrow-band filter, which is used to transmit the ultraviolet light in the light signals. The input end of the ultraviolet photoelectric sensor 512 is located at the image plane position of the trigger lens 511, and the output end is connected with the electric control module 7, which is used to convert the ultraviolet light signals into corresponding trigger electric signals and then transmit them to the electric control module 7. In some embodiments, the ultraviolet photoelectric sensor 512 can also be replaced by a photomultiplier tube, so as to realize the same microsecond-level triggering function. The filter 513 can also be replaced by a customized ultraviolet filter with a wide spectral range and high transmittance according to the actual situation.

[0059] In the embodiment, the spectral response range of the ultraviolet photoelectric sensor 512 is 190nm-1000nm, the response frequency is >1GHz, the quantum efficiency is 75% @λ=200nm, and the chip size is 1.1mm 2 The trigger signal has a rising time of 0.15μs, which is used to quickly and reliably capture the light signals generated by the combustion, combustion and explosion accidents in the target area, and provide the imaging module 6 with a microsecond-level high-sensitivity fast trigger signal.

[0060] The central wavelength of the filter 513 is 300nm, the half-bandwidth is 10nm, the transmittance is ≥15% @300nm, the cutoff wavelength is 200-288.12nm, 312.12-1200nm (OD avg ≥4), and the ultraviolet characteristic spectral band in the light signals generated by the combustion, combustion and explosion accidents is filtered.

[0061] The explosion pressure trigger module 52 is an explosion pressure sensor, the output end of which is connected with the electric control module 7, which is used to monitor the target area and capture the shock wave pressure signal of the target area, and then convert it into a corresponding trigger electric signal and transmit it to the electric control module 7. In the embodiment, the range of the explosion pressure sensor is 0.01-1MPa, the sensitivity is 5000mV / MPa, the trigger signal has a rising time of ≤1μs, and other range explosion pressure sensors can be replaced according to the specific monitoring scene.

[0062] In summary, the ultraviolet photoelectric trigger module 51 and the explosion pressure trigger module 52 of the embodiment form a fast-response trigger module with a microsecond level, and the two modules can operate in an "or" logic relationship to ensure the reliability of the monitoring system task. The electric control module 7 is a control module based on the FPGA hardware architecture, which is used to receive the microsecond-level trigger electrical signal and synchronously control the imaging module 6 to work. The electric control module 7 can realize the coordination and control between the components of the monitoring system, and support the hardware-level configuration of the core parameters such as the imaging frame rate and the exposure time. In the embodiment, the electric control module 7 can realize three aspects of control: first, the operation and output of the trigger signal of the trigger module 5 can be controlled; second, the trigger electrical signal is received to control the imaging module 6 to shoot images (in the daily standby and trigger storage mode); and third, the trigger electrical signal is received to control the acquisition and storage unit 2 to store.

[0063] The imaging module 6 is used to shoot the images of the target area, and transmit the images to the electric control module 7, and then transmit the images to the acquisition and storage unit 2 through the data transmission unit 3 for storage. The imaging module 6 can be composed of an optical lens and a monitoring camera, wherein the field of view angle of the optical lens is greater than 90°, and the single monitoring area of the optical lens is greater than 300 m 2 , which is used to shoot the target area of the dangerous area / operation link; the monitoring frame rate of the monitoring camera is 1000 fps, the image resolution is 1920x1080, the exposure time is 1 μs, and the monitoring camera has an external trigger function, which is used to record the high frame rate and high definition monitoring picture. The imaging module 6 ensures the rapid acquisition of the instantaneous images of the explosion accident after triggering through the high frame rate and short exposure, and reduces the influence of overexposure in the high brightness environment on the key information in the images.

[0064] In combination Figure 2 and Figure 4 , the explosion-proof shell 4 is a cylindrical structure, which includes a front cover 41, a main shell 42 and a rear cover 43. The two ends of the main shell 42 are connected with the front cover 41 and the rear cover 43 respectively, and the connection positions are sealed by O-shaped sealing rings. The central region of the front cover 41 is provided with a quartz glass observation window 44, and the rear cover 43 is provided with an explosion-proof gland interface 45. The imaging module 6, the ultraviolet photoelectric trigger module 51, the explosion pressure trigger module 52 and the electric control module 7 are all located in the main shell 42, and the detection surfaces of the ultraviolet photoelectric trigger module 51, the explosion pressure trigger module 52 and the imaging module 6 are all arranged close to the observation window 44, which meets the protection standard of the industrial plant monitoring camera.

[0065] The input end of the data transmission unit 3 is connected with the electric control module 7 through the explosion-proof gland interface 45. The explosion-proof shell 4 is made of stainless steel and has good sealing performance, which can ensure that the ignition sources such as electric sparks and high-temperature surfaces generated inside the explosion-proof shell 4 cannot ignite the external dangerous environment, and meets the national use specification for electrical equipment in explosive environments.

[0066] The dustproof brush assembly, the dust cover 46 and the mounting bracket 47 can also be configured according to the actual use scene; wherein the dust cover 46 is selected to be made of 2mm stainless steel plate and is placed on the top of the main shell 42, and is used to avoid the influence of rain, snow and sunlight on the performance of the components in the explosion-proof housing 4 when used outdoors.

[0067] The dustproof brush assembly includes a brush rod 48 and a windshield wiper motor; the windshield wiper motor is installed at the bottom of the main shell 42 near the front cover 41, and the output end of the windshield wiper motor is connected with the brush rod 48; the brush rod 48 is located outside the front cover 41, and the brush rod 48 is provided with bristles, and the brush rod 48 swings back and forth under the drive of the windshield wiper motor to clean the observation window 44.

[0068] In combination with Figure 2 and Figure 5 , the mounting bracket 47 is located at the bottom of the main shell 42, and the mounting bracket 47 includes a bracket 471, a pitch bracket 472 and an azimuth bracket 473, each of which is made of 2mm stainless steel plate. The bracket 471 is fixedly connected with the bottom of the main shell 42, the top of the pitch bracket 472 is fixedly connected with the bracket 471, and the bottom is movably connected with the top of the azimuth bracket 473; the bottom of the azimuth bracket 473 is movably installed at the corresponding position in the monitoring scene through the installation adjusting groove. Before installation, the pitch bracket 472 and the azimuth bracket 473 can be adjusted to a preset angle in advance, or a remote control device can be provided according to the actual application scene, so as to remotely adjust the angle as needed. Through the mounting bracket 47, the orientation of the monitoring unit 1 can be flexibly adjusted, so as to ensure that the monitoring unit 1 can cover the target area to be monitored in all directions.

[0069] The acquisition storage unit 2 of the embodiment comprises an image acquisition card and a host computer; wherein the image acquisition card adopts a CXP image acquisition card, supports CXP1.1 / 2.0 protocol standards, and the single-channel bandwidth can reach 12.5Gbps1.1 protocol or 25Gbps2.0 protocol. Through the design of a PCIe host interface, the sustained throughput capacity of GB-level data can be guaranteed. The integrated hardware deframing unit realizes zero-delay protocol conversion from CXP protocol to image data, has frame capture and transmission functions, and reduces the running pressure of the CPU from the hardware. The input end of the image acquisition card is connected with the data transmission unit 3, the output end is connected with the host computer, is used for acquiring the image data transmitted by the data transmission unit 3 and outputting to the host computer storage. The data transmission unit 3 has a CXP-12 interface, is used for high-bandwidth (50Gbps), low-delay (microsecond level), long-distance (hundred-meter level) high-speed image data transmission. The host computer adopts a pre-allocated ring buffer architecture design, supports a data writing speed of more than 2GB / s; is equipped with a special storage hard disk to realize the rapid writing of cached data after triggering; supports a memory-hard disk multi-level storage architecture, ensures the real-time processing and stable storage of high-speed data flow, and meets the high-speed data acquisition requirements in multiple scenes. The host computer of the embodiment can select a notebook computer, a desktop computer, an industrial computer and the like, is used for realizing the caching, storage and display of large-capacity image data.

[0070] The embodiment provides a split type high-speed monitoring method in a high-risk explosion environment, adopts a daily standby and trigger storage mode, and comprises the following steps.

[0071] Step 1: Assemble the split type high-speed monitoring system for the high-risk explosion environment, pre-set the light intensity trigger threshold of the ultraviolet photoelectric trigger module 51, the shock wave pressure trigger threshold of the explosion pressure trigger module 52 and the imaging parameters of the imaging module 6 according to the monitoring requirements, and install the monitoring unit 1 as a whole at the corresponding position in the monitoring scene. At the same time, the installation angle of the installation support 47 should also be adjusted according to the monitoring requirements, so that the detection surfaces of the imaging module 6, the ultraviolet photoelectric trigger module 51 and the explosion pressure trigger module 52 all face the dangerous area / operation link area.

[0072] In the embodiment, the imaging parameters of the imaging module 6 include exposure time, image resolution and monitoring frame rate, wherein the monitoring frame rate is not less than 1000fps, so as to realize the recording of a high-frame-rate high-definition monitoring picture.

[0073] Step 2: The target area is continuously monitored by the ultraviolet photoelectric trigger module 51 and the explosion pressure trigger module 52, when the light intensity and / or shock wave pressure of the target area is greater than or equal to the corresponding trigger threshold, the ultraviolet photoelectric trigger module 51 and / or the explosion pressure trigger module 52 converts the light signal and / or the shock wave pressure signal into a trigger electrical signal and transmits it to the electric control module 7, and the electric control module 7 randomly controls the imaging module 6 to start shooting.

[0074] Step 3: The image of the target area is shot by the imaging module 6, and the image data is transmitted to the acquisition storage unit 2 through the electric control module 7 and the data transmission unit 3 for storage, thereby realizing the split type high-speed monitoring in the high-risk explosion environment. In this process, the electric control module 7 can also pre-process (format conversion / time stamp injection) the image shot by the imaging module 6 in real time, so that the relevant image can be quickly extracted from the acquisition storage unit 2 later.

[0075] The split type high-speed monitoring system and method for high-risk explosion safety accident investigation provided by the embodiment solve the technical problem that the traditional monitoring equipment cannot capture the instantaneous key image of the accident in the high-risk explosion accident investigation due to trigger delay, insufficient frame rate and storage architecture defects, thereby providing image tracing means for high-risk environment accident investigation and enhancing the prevention and post-analysis efficiency of the safety protection system. The present application has the ability of fast triggering, high time resolution and safe data storage, and has important practical significance for collecting explosion accident initial images, improving accident tracing accuracy and optimizing safety protection system.

[0076] Embodiment two

[0077] The embodiment also provides another split type high-speed monitoring method for high-risk explosion environment, which is different from the embodiment one in that the monitoring method adopts daily caching and trigger storage mode, and the monitoring method comprises the following steps:

[0078] Step 1: Assemble the split high-speed monitoring system for high-risk explosion environment described in this embodiment, pre-set the light intensity trigger threshold of the ultraviolet photoelectric trigger module 51, the shock wave pressure trigger threshold of the explosion pressure trigger module 52, the imaging parameters of the imaging module 6, and the storage time window of the acquisition storage unit 2 according to the monitoring requirements, and install the monitoring unit 1 as a whole at the corresponding position in the monitoring scene. At the same time, the installation angle of the installation support 47 should also be adjusted according to the monitoring requirements, so that the detection surfaces of the imaging module 6, the ultraviolet photoelectric trigger module 51, and the explosion pressure trigger module 52 all face the dangerous area / operation link. The storage time window can be set to 29 seconds before triggering + 1 second after triggering, or the specific time can be set according to the on-site requirements. Similarly, in this embodiment, the imaging parameters of the imaging module 6 include exposure time, image resolution, and monitoring frame rate, and the monitoring frame rate is not less than 1000 fps, so as to realize the recording of high frame rate high definition monitoring picture.

[0079] Step 2: Continuously monitor the target area through the ultraviolet photoelectric trigger module 51 and the explosion pressure trigger module 52, and take images of the target area through the imaging module 6, and transmit the image data to the acquisition storage unit 2 for cyclic caching in real time through the electric control module 7 and the data transmission unit 3, so as to meet the daily monitoring display requirements.

[0080] Step 3: When the light intensity and / or shock wave pressure captured by the ultraviolet photoelectric trigger module 51 and / or the explosion pressure trigger module 52 is greater than or equal to the corresponding trigger threshold, the ultraviolet photoelectric trigger module 51 and / or the explosion pressure trigger module 52 converts the collected light signal and / or shock wave pressure signal into a trigger electrical signal and transmits it to the electric control module 7.

[0081] Step 4: The electric control module 7 controls the acquisition storage unit 2 to perform trigger storage operation according to the storage time window, specifically, the acquisition storage unit 2 extracts the image data 29 seconds before triggering from the cyclic cache, and continues to store the image data taken by the imaging module 6 within 1 second after triggering, and finally integrates and stores the image data in the storage time window in time sequence, so that the on-site image at the time of the accident can be quickly extracted when the accident is investigated in the later period. Thus, the split high-speed monitoring in the high-risk explosion environment is realized.

[0082] The present application solves the key problems of slow trigger speed, low monitoring frame rate, and event transient image acquisition failure or data damage caused by integrated storage in explosion accident investigation by using microsecond-level fast trigger, kilo-frame-level high-speed photography, and split fast storage, and provides an effective device and method for obtaining direct image evidence chain for high-risk explosion safety accident investigation.

[0083] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A split type high-speed monitoring system for high-risk explosion environment, characterized in that: it comprises a monitoring unit (1), a collection and storage unit (2) and a data transmission unit (3); the monitoring unit (1) is located in the monitoring scene and comprises an explosion-proof shell (4), a trigger module (5), an imaging module (6) and an electric control module (7) installed in the explosion-proof shell (4); the trigger module (5) and the imaging module (6) are connected with the electric control module (7) respectively, the trigger module (5) has a microsecond-level triggering function, is used for monitoring a target area and collecting light signals and / or shock wave pressure signals generated by combustion, explosion or explosion in the target area; the trigger module (5) comprises an ultraviolet photoelectric trigger module (51) and an explosion pressure trigger module (52); the ultraviolet photoelectric trigger module (51) comprises a trigger lens (511) and an ultraviolet photoelectric sensor (512) arranged in sequence; the trigger lens (511) selects a super wide-angle lens and is used for collecting and converging light signals emitted from the target area; an input end of the ultraviolet photoelectric sensor (512) is located at an image plane position of the trigger lens (511), an output end is connected with the electric control module (7), the ultraviolet photoelectric sensor (512) is used for collecting the light signals converged by the trigger lens (511), converting the light signals into corresponding trigger electric signals and then transmitting the trigger electric signals to the electric control module (7); the spectral response range of the ultraviolet photoelectric sensor (512) is 190nm-1000nm, the response frequency is >1GHz and the trigger signal rising time is <1μs; the explosion pressure trigger module (52) is an explosion pressure sensor, the trigger signal rising time of the explosion pressure trigger module (52) is ≤1μs, an output end of the explosion pressure trigger module (52) is connected with the electric control module (7) and is used for monitoring the target area, capturing shock wave pressure signals of the target area, converting the shock wave pressure signals into corresponding trigger electric signals and then transmitting the trigger electric signals to the electric control module (7); the electric control module (7) is a control module based on an FPGA hardware architecture, is used for receiving the trigger electric signals and controlling the imaging module (6) to work; the imaging module (6) is used for image shooting of the target area and transmitting image data to the electric control module (7); the explosion-proof shell (4) has a cylindrical structure and comprises a front cover (41), a main shell (42) and a rear cover (43); two ends of the main shell (42) are connected with the front cover (41) and the rear cover (43) respectively and the connection positions are sealed; a central region of the front cover (41) is provided with an observation window (44) and the rear cover (43) is provided with an explosion-proof gland joint (45); the ultraviolet photoelectric trigger module (51), the explosion pressure trigger module (52), the imaging module (6) and the electric control module (7) are located in the main shell (42) and the detection surfaces of the ultraviolet photoelectric trigger module (51), the explosion pressure trigger module (52) and the imaging module (6) are arranged close to the observation window (44). ​ ​ ​ The acquisition storage unit (2) is located outside the monitoring scene; the input end of the data transmission unit (3) is connected with the electric control module (7) through the anti-explosion gland interface (45), and the output end is connected with the acquisition storage unit (2); the electric control module (7) transmits the image data to the acquisition storage unit (2) through the data transmission unit (3) for storage.

2. The split type high-speed monitoring system for high-risk explosion environment according to claim 1, characterized in that: The ultraviolet photoelectric trigger module (51) further comprises a filter (513) between the trigger lens (511) and the ultraviolet photoelectric sensor (512); the filter (513) is a narrow-band filter for transmitting ultraviolet light in the optical signal.

3. The split type high-speed monitoring system for high-risk explosion environment according to claim 2, characterized in that: The center wavelength of the filter (513) is selected in the range of 200-400 nm, with a full width at half maximum ≤10 nm, and the cut-off range optical density OD avg ≥4.

4. The split type high-speed monitoring system for high-risk explosion environment according to claim 3, characterized in that: It further comprises a dust brush assembly, a dust cover (46) and a mounting bracket (47); The dust brush assembly comprises a brush rod (48) and a windshield wiper motor; the windshield wiper motor is installed at the bottom of the main housing (42) close to the front cover (41), and the output end of the windshield wiper motor is connected with the brush rod (48); the brush rod (48) is located outside the front cover (41), and brush hairs are arranged on the brush rod (48); the brush rod (48) swings back and forth under the drive of the windshield wiper motor to clean the observation window (44); The dust cover (46) is located at the top of the main housing (42), and the mounting bracket (47) is located at the bottom of the main housing (42); the mounting bracket (47) comprises a bracket (471), a pitch bracket (472) and an azimuth bracket (473); the bracket (471) is fixedly connected with the bottom of the main housing (42), the top of the pitch bracket (472) is fixedly connected with the bracket (471), and the bottom is movably connected with the top of the azimuth bracket (473); the bottom of the azimuth bracket (473) is movably installed in the monitoring scene through the mounting adjusting groove.

5. The split type high-speed monitoring system for high-risk explosion environment according to any one of claims 1 to 4, characterized in that: The imaging module (6) has an external trigger function, with a maximum monitoring frame rate ≥1000fps, an image resolution ≥1920×1080, and a shortest exposure time ≤1μs.

6. The split type high-speed monitoring system for high-risk explosion environment according to claim 5, characterized in that: The data transmission unit (3) supports CoaXPress protocol and provides a single 12.5Gbps data transmission rate; The acquisition storage unit (2) comprises an image acquisition card and an upper computer; the image acquisition card adopts a CoaXPress image acquisition card, the input end of which is connected with the data transmission unit (3), and the output end is connected with the upper computer, for acquiring the image data transmitted by the data transmission unit (3) and outputting to the upper computer for storage.

7. A split high-speed monitoring method for high-risk explosion environment, characterized in that, The daily standby and trigger storage mode comprises the following steps: Step 1: Assemble the split high-speed monitoring system for high-risk explosion environment according to any one of claims 1 to 6, set the trigger threshold of the trigger module (5) and the imaging parameters of the imaging module (6) in advance according to the monitoring requirements, and install the monitoring unit (1) in the monitoring scene so that the trigger module (5) and the imaging module (6) face the target area; the trigger threshold includes the trigger threshold of light intensity and shock wave pressure; the imaging parameters include exposure time, image resolution and monitoring frame rate, wherein the monitoring frame rate is not less than 1000 fps; Step 2: Continuously monitor the target area through the trigger module (5), when the light intensity and / or shock wave pressure of the target area is greater than or equal to the corresponding trigger threshold, the trigger module (5) converts the light signal and / or shock wave pressure signal of the target area into a trigger electrical signal and transmits it to the electronic control module (7), and the electronic control module (7) controls the imaging module (6) to start shooting immediately; Step 3: Image shooting of the target area is performed by the imaging module (6), and the image data is transmitted to the acquisition and storage unit (2) in sequence through the electronic control module (7) and the data transmission unit (3) for storage, thereby realizing split high-speed monitoring in high-risk explosion environment.

8. A split high-speed monitoring method for high-risk explosion environment, characterized in that, Adopting daily buffer and trigger storage mode, including the following steps: Step 1: Assemble the split high-speed monitoring system for high-risk explosion environment according to any one of claims 1 to 6, set the trigger threshold of the trigger module (5), the imaging parameters of the imaging module (6), and the storage time window of the acquisition and storage unit (2) in advance according to the monitoring requirements, and place the monitoring unit (1) in the monitoring scene so that the trigger module (5) and the imaging module (6) face the target area; the trigger threshold includes the trigger threshold of light intensity and shock wave pressure; the imaging parameters include exposure time, image resolution and monitoring frame rate, wherein the monitoring frame rate is not less than 1000 fps; the storage time window is n seconds before triggering and m seconds after triggering, and n and m are both greater than or equal to 0; Step 2: Continuously monitor the target area through the trigger module (5), and continuously image shoot the target area through the imaging module (6), and transmit the image data to the acquisition and storage unit (2) in real time through the electronic control module (7) and the data transmission unit (3) for cyclic buffering, to meet the daily monitoring display requirements; Step 3: When the light intensity and / or shock wave pressure of the target area is greater than or equal to the corresponding trigger threshold, the trigger module (5) converts the light signal and / or shock wave pressure signal of the target area into a trigger electrical signal and transmits it to the electronic control module (7); Step 4: The electronic control module (7) controls the acquisition and storage unit (2) to perform trigger storage operation according to the storage time window, thereby realizing split high-speed monitoring in high-risk explosion environment; the trigger storage operation refers to extracting the image data shot within n seconds before triggering to m seconds after triggering from the cyclic buffer, and finally integrating and storing the image data within the storage time window in time sequence.

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