Split type high-speed monitoring system and method used in high-risk burning and explosion environment

Abstract

In order to solve the technical problems that traditional monitoring equipment is delayed in triggering, insufficient in frame rate and poor in storage architecture, and an existing high-speed camera system is low in data extraction efficiency, the safety of a storage medium is difficult to guarantee and the like, the invention discloses a split type high-speed monitoring system and method used in a high-risk burning and explosion environment. Wherein the monitoring system comprises a monitoring unit, an acquisition and storage unit and a data transmission unit; the monitoring unit is located in a monitoring scene, the acquisition and storage unit is located outside the monitoring scene, and the monitoring unit and the acquisition and storage unit are connected through the data transmission unit; the monitoring unit comprises an explosion-proof shell, and a trigger module, an imaging module and an electric control module which are positioned in the explosion-proof shell; the trigger module monitors a target area and collects optical signals and / or shock wave pressure signals generated by combustion, fire blast or explosion, converts the optical signals and / or shock wave pressure signals into trigger electric signals and transmits the trigger electric signals to the electric control module, and the electric control module controls the imaging module to shoot images of the target area and transmits image data to the collection and storage unit through the data transmission unit to be stored.

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 are lagging, and they are prone to oversaturation when facing high-intensity flashes, resulting in images with only white noise and 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 time resolution problem of the traditional monitoring device to some 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 generate TB level massive data in single collection, which not only causes waste of storage resources, but also leads to low extraction efficiency of effective data. In addition, the high-speed camera system generally adopts centralized storage architecture, even if an industrial grade protective shell is used, it is still difficult to guarantee the safety of the storage medium in extreme scenes such as chemical explosion. At the same time, the existing high-speed camera system generally lacks a fast trigger 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 scenes.

[0005] In summary, it is urgent to develop a transient image monitoring system with microsecond-level trigger, high frame rate imaging and safe storage, which directly restores the key dynamic characteristics at the moment of event occurrence, and provides irreplaceable objective evidence support for accurately determining the accident cause, dividing the responsibility and improving the preventive measures. SUMMARY

[0006] The purpose of the present application is to solve the technical problems that the traditional monitoring device is limited by trigger 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 trigger mechanism, and to 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: 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; The monitoring unit is located in the monitoring scene and comprises an explosion-proof shell, and a trigger module, an imaging module and an electric control module installed in the explosion-proof shell; The trigger module and the imaging module are connected with the electric control module respectively, the trigger module has a microsecond-level trigger 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 transmits the signals converted into trigger electric signals to the electric control module; The electric control module is a control module based on FPGA hardware architecture, used for receiving trigger electric signals and controlling the imaging module to work; the imaging module is used for image shooting of the target area and transmitting image data to the electric control module; The acquisition 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 acquisition storage unit; the electric control module transmits image data to the acquisition storage unit through the data transmission unit for storage.

[0008] Further, the trigger module comprises an ultraviolet photoelectric trigger module and an explosion pressure trigger module arranged in sequence. 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 a 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 electric signals and then transmitting them to the electric control module. The explosion pressure trigger module is an explosion pressure sensor, the output end of which is connected with the electric control module, and 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 corresponding trigger electric signals and transmitting them to the electric control module.

[0009] 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, and is used for transmitting ultraviolet light in the light signals.

[0010] Further, the trigger lens is an ultra-wide-angle lens. 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. The center wavelength of the optical filter is selected from the range of 200-400nm, the half-peak full width is ≤10nm, and the cut-off range optical density OD avg ≥4; The trigger signal rising time of the explosion pressure sensor is ≤1μs.

[0011] Further, the explosion-proof shell is a cylindrical structure, comprising a front cover, a main shell and a rear cover; the two ends of the main shell are connected with the front cover and the rear cover respectively, and the connection positions are sealed; the central region 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.

[0012] Further, it further comprises a dust brush assembly, a dust cover and a mounting bracket. The dustproof brush assembly comprises a brush rod and a wiper motor; the wiper motor is installed at the bottom of the main shell near the front cover, and the output end of the wiper motor is connected with the brush rod; the brush rod is located outside the front cover, and the brush rod is provided with brush hairs, and the brush rod swings back and forth under the drive of the wiper motor to clean the observation window; The dustproof 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 movably installed in the monitoring scene through the installation adjusting groove.

[0013] Further, the imaging module has an external triggering function, with a maximum monitoring frame rate of ≥1000fps, an image resolution of ≥1920x1080, and a minimum exposure time of ≤1μs.

[0014] Further, the data transmission unit supports the CoaXPress protocol and provides a single 12.5Gbps data transmission rate. 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 the image data to the upper computer for storage.

[0015] 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: Step 1: Assembling the split type high-speed monitoring system for high-risk explosion environment, setting the trigger threshold of the trigger module and the imaging parameter of the imaging module in advance according to the monitoring requirements, and installing the monitoring unit in the monitoring scene so that the trigger module and the imaging module face the target area; the trigger threshold comprises the trigger threshold of light intensity and shock wave pressure; the imaging parameter comprises exposure time, image resolution and monitoring frame rate, wherein the monitoring frame rate is not less than 1000fps; Step 2: Continuously monitoring the target area 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, converting the light signal and / or shock wave pressure signal of the target area into a trigger electrical signal by the trigger module and transmitting the trigger electrical signal to the electric control module, and then starting the imaging module to shoot by the electric control module; Step 3: Shooting the image of the target area by the imaging module, and transmitting the image data to the acquisition and storage unit through the electric control module and the data transmission unit in sequence for storage, so as to realize the split type high-speed monitoring in the high-risk explosion environment.

[0016] In addition, the application also provides another split type high-speed monitoring method for high-risk explosion environment, which adopts daily cache and trigger storage mode and comprises the following steps. Step 1: Assemble the split type 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 according to the monitoring requirement, 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 comprises the trigger threshold of light intensity and shock wave pressure; the imaging parameter comprises 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, continuously take images of the target area through the imaging module, and transmit the image data to the acquisition storage unit through the electric control module and the data transmission unit for cyclic caching in real time to meet the daily monitoring display requirement; 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 converts the light signal and / or shock wave pressure signal of the target area into a trigger electric signal and transmits it to the electric control module; Step 4: The electric control module controls the acquisition storage unit to perform trigger storage operation according to the storage time window, so as to realize split type high-speed monitoring in high-risk explosion environment; the trigger storage operation refers to extracting the image data taken from n seconds before triggering to m seconds after triggering from the cyclic cache, and finally integrating and storing the image data in the storage time window in time sequence.

[0017] Compared with the prior art, the application has the following beneficial effects: 1. The split type high-speed monitoring system for high-risk explosion environment comprises a monitoring unit, an acquisition storage unit and a data transmission unit, wherein the monitoring unit is located in the monitoring scene, the acquisition storage unit is located outside the monitoring scene, and the two are communicatively connected through the data transmission unit, so as to realize the split type architecture of "near-end acquisition-remote storage", realize high-speed monitoring of on-site transient time and safe storage of rear-end data through spatial separation deployment, and is especially suitable for extreme scenes such as chemical explosion, metal dust explosion and the like, and provides direct data support for accident process reconstruction.

[0018] 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, which can realize the coverage of a monitoring area with a super wide visual angle; the ultraviolet photoelectric sensor adopts a photoelectric sensor responding to a microsecond-level rising edge in an ultraviolet spectrum, which can quickly capture a light signal to trigger the imaging module to shoot and store data when a high-risk explosion accident occurs, effectively solving the problem that the monitoring equipment cannot capture key image data in the accident process due to slow trigger response speed.

[0019] 3、The monitoring unit of the present application adopts an explosion-proof shell for protection, so as to ensure that the ignition source such as electric spark and high-temperature surface generated inside will not ignite the external dangerous environment, thereby ensuring the safety in use.

[0020] 4、The present application can adjust the installation angle of the explosion-proof shell through the installation support, thereby ensuring the effectiveness of image acquisition.

[0021] 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, thereby ensuring the definition of image shooting and improving the accuracy of later accident analysis.

[0022] 6、The highest monitoring frame rate of the imaging module in the present application is ≥1000fps, the data transmission unit supports CoaXPress high-speed communication protocol, and provides a single 12.5Gbps data transmission rate, so as to ensure the rapid acquisition and high-speed transmission of the instantaneous image of the explosion accident after triggering.

[0023] 7、The present application can provide millisecond-level spatiotemporal precision image evidence chain for sudden explosion safety accident investigation through the cooperation of the monitoring unit, the acquisition and storage unit and the data transmission unit, especially in high-risk explosion accidents, which can record continuous visual evidence from abnormal signs to the evolution of the situation, breaking through the technical obstacles of the "key data black window period" of conventional monitoring equipment.

[0024] 8、The present application is a split type high-speed monitoring method for high-risk explosion environment, which can select standby mode, 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 initial images of explosion accidents and improving accident tracing accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of the embodiment of the split type high-speed monitoring system for high-risk explosion environment of the present application.

[0026] Figure 2This is a schematic diagram of the structure of the monitoring unit in an embodiment of the split-type high-speed monitoring system for high-risk combustion and explosion environments of the present invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of the monitoring unit in an embodiment of the split-type high-speed monitoring system for high-risk combustion and explosion environments of the present invention.

[0028] Figure 4 This is a schematic diagram of the explosion-proof housing in an embodiment of the split-type high-speed monitoring system for high-risk explosive environments according to the present invention.

[0029] Figure 5 This invention provides a schematic diagram of the mounting bracket in an embodiment of a split-type high-speed monitoring system for high-risk explosive environments.

[0030] The annotations in the attached figures are explained as follows: 1-Monitoring unit, 2-Acquisition and storage unit, 3-Data transmission unit, 4-Explosion-proof housing, 41-Front cover, 42-Main housing, 43-Rear cover, 44-Observation window, 45-Explosion-proof gland interface, 46-Dust cover, 47-Mounting bracket, 471-Bracket, 472-Elevation mount, 473-Azimuth mount, 48-Brush rod, 5-Trigger module, 51-Ultraviolet photoelectric trigger module, 511-Trigger lens, 512-Ultraviolet photoelectric sensor, 513-Filter, 52-Explosion pressure trigger module, 6-Imaging module, 7-Electronic control module. Detailed Implementation

[0031] 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.

[0032] Example 1 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.

[0033] The embodiment is directed to monitoring the dangerous area / operation link of a chemical plant. Based on the scene, the monitoring unit 1 is placed in the monitoring scene, the collection and storage unit 2 is placed outside the monitoring scene, and the two are physically connected through the data transmission unit 3. The data transmission unit 3 adopts CoaXPress (CXP) protocol, is connected through high-speed coaxial cable or optical fiber (which needs to pass through a converter), can provide scalable transmission bandwidth of 6.25Gbps to 25Gbps for a single link, the cable length reaches hundreds of meters, and ensures real-time transmission and physical isolation safety of high-definition image data with millisecond-level delay. The monitoring unit 1 and the collection and storage unit 2 are connected through the data transmission unit 3, which is used to realize daily monitoring, image data transmission and storage of the dangerous area / operation link of the chemical plant, and rapid triggering, image collection, high-speed image data transmission and safe storage when an accident occurs.

[0034] As shown in Figure 2 and Figure 3 , the size of the monitoring unit 1 is 349mm x 203mm x 336.5mm, and of course, the specific size can be designed according to the actual use scene. The monitoring unit 1 comprises an explosion-proof shell 4, and a triggering module 5, an imaging module 6 and an electric control module 7 installed in the explosion-proof shell 4. The triggering module 5 and the imaging module 6 are connected with the electric control module 7, wherein the triggering module 5 has a microsecond-level triggering function, which is used to monitor the target area and collect the light signal and / or shock wave pressure signal generated by the target area due to combustion, combustion, explosion and other accidents, and then convert them into triggering electrical signals and transmit them to the electric control module 7.

[0035] Specifically, the triggering module 5 comprises an ultraviolet photoelectric triggering module 51 and an explosion pressure triggering module 52; the ultraviolet photoelectric triggering module 51 comprises a triggering lens 511, a filter 513 and an ultraviolet photoelectric sensor 512 arranged in sequence, wherein the triggering lens 511 selects a super wide-angle lens with a large field of view angle, which is used to collect and converge the light signal 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 signal. The input end of the ultraviolet photoelectric sensor 512 is located at the image plane position of the triggering lens 511, and the output end is connected with the electric control module 7, which is used to convert the ultraviolet light signal into the corresponding triggering electrical signal and transmit it to the electric control module 7. In some embodiments, the ultraviolet photoelectric sensor 512 can also be replaced by a photomultiplier tube, thereby realizing 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.

[0036] 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 rising time is 0.15μs, which is used for capturing the light signal generated by the combustion, combustion, explosion and other accidents in the target area quickly and reliably, and providing a 6-microsecond-level high-sensitivity fast trigger signal for the imaging module.

[0037] The center wavelength of the optical 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 spectrum in the light signal generated by the combustion, combustion, explosion and other accidents is filtered.

[0038] 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 for monitoring the target area and capturing the shock wave pressure signal of the target area, and then converting it into a corresponding trigger electrical signal and transmitting it to the electric control module 7. In this embodiment, the range of the explosion pressure sensor is 0.01~1MPa, the sensitivity is 5000mV / MPa, the trigger signal rising time is ≤1μs, and other range explosion pressure sensors can be replaced according to the specific monitoring scene difference.

[0039] As described above, the ultraviolet photoelectric trigger module 51 and the explosion pressure trigger module 52 of this embodiment form a microsecond-level fast response trigger module, and the two modules can operate in an "or" logical 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 for receiving the microsecond-level trigger electrical signal and synchronously controlling the imaging module 6 to work. It 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 imaging frame rate and exposure time. In this embodiment, the electric control module 7 can realize three aspects of control: first, it can control the operation and output of the trigger module 5 trigger signal; second, it can receive the trigger electrical signal and control the imaging module 6 to shoot images (in the daily standby and trigger storage mode); third, it can receive the trigger electrical signal and control the acquisition and storage unit 2 to store.

[0040] The imaging module 6 is used for shooting the image of the target area, and transmitting the image to the electric control module 7, and then transmitting it 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 >90°, and the single monitoring area of the optical lens is >300m 2 , which is used for shooting the target area of the dangerous area / operation link; the monitoring frame rate of the monitoring camera is 1000fps, the image resolution is 1920×1080, the exposure time is 1μs, and it has an external trigger function, which is used for recording high-frame-rate high-definition monitoring pictures. The imaging module 6 ensures the fast acquisition of the instantaneous image of the deflagration accident after triggering by high frame rate and short exposure, and reduces the influence of overexposure in high brightness environment on the key information in the image.

[0041] In combination Figure 2 and Figure 4 , the explosion-proof shell 4 is a cylindrical structure, including a front cover 41, a main shell 42 and a rear cover 43, wherein the two ends of the main shell 42 are connected with the front cover 41 and the rear cover 43 respectively, and the connection is sealed by an O-shaped sealing ring. The central area 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 electronic 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, meeting the protection standard of the industrial plant monitoring camera.

[0042] The input end of the data transmission unit 3 is connected with the electronic control module 7 through the explosion-proof gland interface 45. The explosion-proof shell 4 is made of stainless steel as a whole and has good sealing performance, so that the ignition source such as electric spark and high-temperature surface generated inside can not ignite the external dangerous environment, meeting the national use standard for electrical equipment in explosive environment.

[0043] A dust brush assembly, a dust cover 46 and a mounting bracket 47 can also be configured according to the actual use scene; wherein the dust cover 46 is made of 2mm stainless steel plate and is placed on the top of the main shell 42, which is used to avoid the influence of rain, snow and sunlight on the performance of the components inside the explosion-proof shell 4 when used outdoors.

[0044] The dust 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 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 the brush rod 48 is provided with bristles, which swings back and forth to clean the observation window 44 under the drive of the windshield wiper motor.

[0045] In combination 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 an installation adjusting groove. Before installation, the pitch bracket 472 and the azimuth bracket 473 can be adjusted to a preset angle, 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.

[0046] 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 CPU from 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 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 data writing speed of 2GB / s or above; is equipped with a special storage hard disk to realize the rapid writing of cached data after triggering; supports 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 demand 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.

[0047] 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. Step 1: Assemble the split type high-speed monitoring system in a 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.

[0048] 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.

[0049] Step 2: Continuously monitor the target area through 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 shock wave pressure signal into a trigger electric 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.

[0050] Step 3: An image of the target area is taken by the imaging module 6, and the image data is transmitted at high speed to the acquisition storage unit 2 via the electric control module 7 and the data transmission unit 3 for storage, thereby realizing split-type high-speed monitoring in a high-risk explosion environment. In this process, the electric control module 7 can also perform real-time preprocessing (format conversion / time stamp injection) on the image taken by the imaging module 6, so that relevant images can be quickly extracted from the acquisition storage unit 2 later.

[0051] 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 key images of the accident moment due to trigger delay, insufficient frame rate, and defects in the storage architecture, thereby providing an 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 initial images of explosion accidents, improving accident tracing accuracy, and optimizing the safety protection system.

[0052] Embodiment Two The embodiment also provides another split-type high-speed monitoring method for a high-risk explosion environment. The difference between this embodiment and Embodiment One is that this embodiment adopts a daily caching and trigger storage mode. The monitoring method comprises the following steps: Step 1: Assemble the split-type high-speed monitoring system for a high-risk explosion environment described in the 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, wherein the monitoring frame rate is not less than 1000 fps, so as to realize the recording of high-frame-rate high-definition monitoring pictures.

[0053] 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 in real time via the electric control module 7 and the data transmission unit 3 for cyclic caching, so as to meet the daily monitoring display requirements.

[0054] 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 collected light signal and / or shock wave pressure signal is converted into a trigger electric signal by the ultraviolet photoelectric trigger module 51 and / or the explosion pressure trigger module 52, and is transmitted to the electric control module 7.

[0055] Step 4: The electric control module 7 controls the acquisition storage unit 2 to perform a 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 circular buffer, 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 later. Thus, the split type high-speed monitoring in the high-risk explosion environment is realized.

[0056] The present application solves the key problems in explosion accident investigation, such as slow triggering speed of conventional cameras, low monitoring frame rate, and event instantaneous image acquisition or data damage caused by integrated storage, by microsecond-level fast triggering, kiloframe-level high-speed photography, and split type fast storage, and provides an effective device and method for obtaining direct image evidence chain for high-risk explosion safety accident investigation.

[0057] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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 a 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 trigger function, is used for monitoring a target area, collecting light signals and / or shock wave pressure signals generated by combustion, explosion or explosion of the target area, and then transmitting the signals to the electric control module (7) after converting them into trigger electric signals; 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 taking images of the target area and transmitting image data to the electric control module (7); the collection and storage unit (2) is located outside the monitoring scene; an input end of the data transmission unit (3) is connected with the electric control module (7), and an output end thereof is connected with the collection and storage unit (2); the electric control module (7) transmits the image data to the collection and storage unit (2) for storage through the data transmission unit (3).

2. The split type high-speed monitoring system for high-risk explosion environment according to claim 1, characterized in that: 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) 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), and an output end thereof 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) and transmitting them to the electric control module (7) after converting them into corresponding trigger electric signals; the explosion pressure trigger module (52) is an explosion pressure sensor, an output end thereof is connected with the electric control module (7), is used for monitoring the target area, capturing shock wave pressure signals of the target area, and transmitting them to the electric control module (7) after converting them into corresponding trigger electric signals.

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

4. The split type high-speed monitoring system for high-risk explosion environment according to claim 3, characterized in that: the trigger lens (511) is selected as a super wide-angle lens. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 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; The trigger signal rising time of the explosion pressure sensor is ≤1μs.

5. The split type high-speed monitoring system for high-risk explosion environment according to claim 2, characterized in that: The explosion-proof shell (4) is a cylindrical structure, including 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 is sealed; the central area of the front cover (41) is provided with an observation window (44), and the rear cover (43) is provided with an explosion-proof gland interface (45); the ultraviolet photoelectric trigger module (51), the explosion pressure trigger module (52), the imaging module (6) 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); the input end of the data transmission unit (3) is connected with the electric control module (7) through the explosion-proof gland interface (45).

6. The split type high-speed monitoring system for high-risk explosion environment according to claim 5, 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 shell (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 is provided with bristles; 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 shell (42), and the mounting bracket (47) is located at the bottom of the main shell (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 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 used for movably mounting in the monitoring scene through a mounting adjusting groove.

7. The split type high-speed monitoring system for high-risk explosion environment according to any one of claims 1 to 6, 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.

8. The split type high-speed monitoring system for high-risk explosion environment according to claim 7, 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 a host computer; the image acquisition card adopts a CoaXPress image acquisition card, an input end of which is connected with the data transmission unit (3), and an output end of which is connected with the host computer, for acquiring image data transmitted by the data transmission unit (3) and outputting to the host computer for storage.

9. A split high-speed monitoring method for high-risk explosion environment, characterized in that, The daily standby and trigger storage mode is adopted, comprising the following steps: Step 1: assemble the split type high-speed monitoring system for high-risk explosion environment according to any one of claims 1 to 8, set the trigger threshold of the trigger module (5) and the imaging parameter of the imaging module (6) according to the monitoring requirement, 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 comprises the trigger threshold of light intensity and shock wave pressure; the imaging parameter comprises 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 electric signal and transmits it to the electric control module (7), and the electric control module (7) controls the imaging module (6) to start shooting immediately; Step 3: image shooting is performed on the target area through 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) in sequence for storage, thereby realizing split type high-speed monitoring in high-risk explosion environment.

10. A split high-speed monitoring method for high-risk explosion environment, characterized in that, The daily standby and trigger storage mode is adopted, comprising the following steps: Step 1: assemble the split type high-speed monitoring system for high-risk explosion environment according to any one of claims 1 to 8, set the trigger threshold of the trigger module (5) and the imaging parameter of the imaging module (6) according to the monitoring requirement, 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 comprises the trigger threshold of light intensity and shock wave pressure; the imaging parameter comprises 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 electric signal and transmits it to the electric control module (7), and the electric control module (7) controls the imaging module (6) to start shooting immediately; Step 3: image shooting is performed on the target area through 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) in sequence for storage, thereby realizing split type high-speed monitoring in high-risk explosion environment. Step 4: The electric control module (7) controls the acquisition storage unit (2) to perform a triggered storage operation according to a storage time window, so as to realize high-speed monitoring in a split body in a high-risk explosion environment; the triggered storage operation refers to extracting image data photographed within 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 time sequence.

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