Television peeping device in low-light night vision hole

Abstract

The utility model relates to the technical field of coal mine exploration, in particular to an in-hole television peeping device integrating low-light night vision and panoramic drilling camera shooting. The device is composed of a camera system, a low-light night vision device, a variable-diameter flange plate and a probe rod. The camera system comprises a shell, a CCD optical sensor, a camera lens, a light source and a conical reflector; the low-light night vision device comprises an objective lens system, an image intensifier, a power supply and an eyepiece system. Light emitted by the light source is reflected by the inner wall of an exploratory hole, is sequentially enhanced by the objective lens system and the image intensifier and then is transmitted to the conical reflector through the eyepiece system, and finally, a panoramic drilling image is generated by the CCD optical sensor. By combining the low-light night vision technology and the panoramic imaging technology, the image quality under the low-light condition is remarkably improved, and the recognition precision of the hole wall geologic features is improved. The device is simple in structure and low in cost, has remarkable economical efficiency and practicability, and provides an innovative solution with high cost performance for the field of coal mine exploration.

Description

Technical Field

[0001] This utility model relates to the field of coal mine exploration technology, specifically to an in-hole television viewing device that integrates low-light night vision and panoramic borehole photography, which is particularly suitable for geological exploration in low-light and narrow borehole environments. Background Technology

[0002] Coal mine exploration refers to the geological exploration work carried out from the start of coal mine construction to the end of mining. It mainly involves studying, analyzing and evaluating the underground geological characteristics of the coal mine area to determine the location, quantity, quality and occurrence conditions of coal resources, and to provide a scientific basis for the rational development, design and safe production of coal mines.

[0003] A low-light night vision device is a device that uses weak light to create an image, enhancing the human eye's visibility in extremely low-light conditions. Based on electronic imaging technology, it converts weak ambient light signals into electronic signals through photoelectric conversion and electron multiplication mechanisms, amplifies them, and then restores the amplified electronic signals into a visible light image through a fluorescent screen, thus enabling clear observation of objects in low-light environments.

[0004] Current coal mine exploration typically utilizes drill bits on drilling rigs to drill cylindrical holes with a large length-to-diameter ratio into the ground at the mining site. A digital panoramic borehole camera system is then used to capture digital panoramic images of the borehole at different locations, obtaining video images of the interior. System analysis software is then used to analyze these uploaded video images, thereby obtaining information about the deep rock structure and hydrogeological data below the surface. This system is simple in structure, lightweight, and flexible in transportation and installation. However, its disadvantages include:

[0005] The underground environment is dark and the diameter of the exploration borehole is small, making it impossible to install high-power lighting equipment. This affects the clarity of the video images captured by the panoramic borehole camera system, making it difficult to determine the geological data such as the rock structure and strata information of the exploration borehole.

[0006] Therefore, there is an urgent need for an integrated device that combines low-light night vision and drilling camera, and achieves seamless optical path connection through modular design to solve the problem of image clarity in low-light environments. Utility Model Content

[0007] The purpose of this invention is to provide a low-light night vision hole-mounted television viewing device. This device can significantly improve the brightness and detail of images under low light conditions, solve the problem of low image clarity caused by insufficient light in the prior art, and improve the accuracy and reliability of coal mine geological data exploration.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A low-light night vision hole-mounted television viewing device includes:

[0010] A camera system includes a housing and a CCD optical sensor, a camera lens, a light source, and a conical reflector disposed inside the housing, wherein the light source is located between the conical reflector and the camera lens;

[0011] A low-light night vision device includes an objective lens system, an image intensifier, a power supply, and an eyepiece system. The objective lens system is located at the input end of the low-light night vision device, the image intensifier is connected between the objective lens system and the eyepiece system, and the power supply is symmetrically arranged on both sides of the image intensifier.

[0012] A variable diameter flange is provided for detachably connecting the housing and the eyepiece system. The upper diameter of the variable diameter flange matches the diameter of the housing, and the lower diameter matches the diameter of the eyepiece system.

[0013] The probe penetrates the outer shell and the low-light night vision device, and integrates cables inside that are electrically connected to the CCD optical sensor, light source and power supply;

[0014] The light emitted by the light source is reflected by the inner wall of the borehole, then amplified by the objective lens system and the image intensifier, and then transmitted to the conical mirror through the eyepiece system. Finally, a panoramic borehole image is generated by the CCD optical sensor.

[0015] Furthermore, the photocathode surface of the image intensifier coincides with the back focal plane of the objective lens system, and the brightness gain coefficient of the image intensifier is not less than 450 cd / m². 2 / lx.

[0016] Furthermore, the reflecting surface of the conical reflector is a conical curved surface, and its central axis coincides with the optical axis of the camera lens, which is used to convert the annular reflection image of the cylindrical surface of the exploration hole into a planar image.

[0017] Furthermore, a magnetic compass is fixed to the bottom of the housing of the camera system, and the axis of the magnetic compass is parallel to the extension direction of the probe.

[0018] Furthermore, the probe is a multi-section telescopic structure, and its internal cable is connected to the external image processing equipment through a waterproof connector.

[0019] Furthermore, the light source is an LED array with a wavelength range of 400-700nm, and its light intensity is remotely adjusted via a cable inside the probe.

[0020] Furthermore, the optical axes of the objective lens system and the eyepiece system coincide, and the distance between the output end face of the eyepiece system and the input end face of the conical mirror is 5-10 mm.

[0021] Furthermore, the device also includes an image processing module that receives the electrical signal output by the CCD optical sensor and uses an algorithm to restore the ring-shaped panoramic image into an unfolded planar image of the borehole wall.

[0022] Furthermore, a closed cavity is formed between the outer shell and the low-light night vision device through a variable-diameter flange, and the cavity is filled with inert gas.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] 1. This invention innovatively combines low-light night vision technology and panoramic imaging technology, breaking through the technical bottleneck of traditional coal mine exploration equipment in low-light environments. Its core component, the image intensifier, with its high-gain design and precise coaxial structure of the objective lens system, achieves efficient enhancement and conversion of weak reflected light, enabling the device to output high-definition images with uniform brightness and rich detail even in dark, deep-hole environments. This improvement in image quality directly solves the image blurring problem caused by insufficient lighting in existing technologies, significantly improving the accuracy of identifying geological features of the borehole wall, such as fractures, rock strata interfaces, and vein orientations.

[0025] 2. The modular design of this utility model greatly enhances the flexibility and adaptability of on-site operation. The detachable connection of the reducing flange not only simplifies the installation process but also allows for quick replacement of adaptable components according to different borehole diameters, meeting the complex and varied drilling conditions in coal mining. The probe adopts a multi-section telescopic structure and is equipped with a waterproof cable interface, ensuring both the extensibility of deep hole exploration and enhancing the durability of the equipment, making it particularly suitable for humid and water-rich underground environments.

[0026] 3. The synergistic optimization of the optical system and image processing algorithm in this invention enables automatic correction from a ring-shaped panoramic image to an unfolded planar image. The conical curved surface design of the conical reflector maps the three-dimensional ring structure of the borehole wall into a two-dimensional planar image, while the subsequent image processing module restores the real geological texture through a dedicated algorithm. This accurate conversion of spatial mapping provides intuitive and reliable visualization results for geological data analysis, avoiding misjudgments caused by image distortion in traditional techniques.

[0027] 4. The moisture-proof and corrosion-resistant design of this utility model significantly improves reliability. The sealed cavity between the outer shell and the low-light night vision device is filled with inert gas, effectively isolating the electronic components from corrosive media such as water vapor and dust in the underground environment, ensuring long-term stable operation of the equipment under harsh conditions. Meanwhile, the magnetic compass's orientation function provides real-time navigation for the drilling trajectory, avoiding the borehole inclination errors that may occur with traditional blind drilling methods, further improving the spatial accuracy of the exploration data.

[0028] 5. This invention offers significant economic advantages. Compared to traditional solutions that rely on high-power light sources or complex optical compensation, this invention reduces energy consumption and equipment weight through low-light enhancement technology, while simplifying the structural design and reducing manufacturing costs by approximately 30%. It also boasts strong compatibility, allowing direct integration with existing digital drilling camera systems without the need for additional equipment purchases, providing coal mining enterprises with a cost-effective upgrade path.

[0029] In summary, this invention not only achieves a breakthrough in high-definition imaging under low-light conditions at the technical level, but also provides an innovative solution for the coal mine exploration field that combines accuracy, reliability, and economy through structural optimization, algorithm integration, and environmentally adaptable design. It has significant industry-driving significance for improving the efficiency and safety of coal resource development. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the probe structure of this utility model.

[0032] In the diagram: 1. Housing; 2. CCD optical sensor; 3. Camera lens; 4. Light source; 5. Conical mirror; 6. Magnetic compass; 7. Variable diameter flange; 8. Eyepiece system; 9. Image intensifier; 10. Power supply; 11. Objective lens system; 12. Probe. Detailed Implementation

[0033] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0034] Example 1: Application of underground borehole exploration in coal mines

[0035] In underground coal mine operations, this utility model device is deployed in a vertical borehole with a diameter of approximately 120 mm and a depth of 50 m to obtain high-definition images of the rock strata on the borehole wall.

[0036] Before operation, technicians first drilled holes of the target size in the coal mine roof using an anchor cable drilling rig, and then used a high-pressure water gun to flush away rock debris from the hole to ensure the hole wall surface was clean. The device was then lowered to the target depth of 30m using multiple sections of retractable probe 12. Figure 2As shown, the telescopic probe 12 can be structured with a threaded rod at one end and a threaded hole at the other. Thus, when drilling depth is deep, the overall length of the probe 12 can be adjusted by engaging the threads of several identical probes 12 at their ends, meeting the detection needs of boreholes at different depths. The probe 12 is hollow inside and integrates a double-shielded cable. This cable connects to the ground control console, transmitting power and signals in real time. The specific cable parameters are: core wire cross-sectional area 0.75 mm². 2 .

[0037] Once the device reaches the predetermined position, the light source 4 of the camera system is activated. This light source 4 employs an LED array with a wavelength range of 400-700nm, specifically comprising 20 individual 0.5W LED beads. The light intensity is adjusted to 500 lux via a PWM dimming circuit to accommodate the low reflectivity of the coal seam. The LED light illuminates the borehole wall at a 30° divergence angle, forming a weak light signal after reflection from the rock surface. This light signal is focused onto the photocathode surface of the image intensifier 9 by an objective lens system 11 with a focal length of 30mm and an aperture of F1.4. At this time, the power supply 10 powers the image intensifier 9, which performs photoelectric conversion and electron multiplication on the light signal, outputting a brighter visible light image. The enhanced light signal is then transmitted to the conical reflector 5 of the camera system via an eyepiece system 8 with a focal length of 15mm and a field of view of 60°. Among them, the image intensifier 9 can be the 1XZ40 / 13F image intensifier 9 manufactured by North Night Vision Technology Co., Ltd., with a brightness gain coefficient ≥450cd / m². 2 / lux, equivalent background illuminance ≤4×10 -7 lux.

[0038] The conical reflector 5 converts the annular reflected image of the borehole's cylindrical surface into a planar image, which is then captured by the camera lens 3. The CCD optical sensor 2 converts the light signal of the borehole wall image captured by the camera lens 3 into an electrical signal. The radius of curvature of the conical reflector 5 can be 80 mm, and the reflective surface is coated with a SiO2 anti-reflection film. The RAW format image data output by the CCD optical sensor 2 is transmitted to a ground computer via an internal cable of the probe 12. The image processing module uses an inverse projection algorithm to eliminate the geometric distortion of the annular image and automatically identifies rock fractures based on grayscale gradient analysis. Simultaneously, the magnetic compass 6 at the bottom of the outer casing 1 records the borehole azimuth and tilt angle data in real time at a sampling frequency of at least 10 Hz, and fuses it synchronously with the image data to generate a three-dimensional geological model of the borehole.

[0039] In an underground test at a coal mine, the device successfully captured images of the interface between a 1.5m thick sandstone layer and a 0.8m thick mudstone layer at a depth of 30m. Compared with traditional borehole camera systems, the signal-to-noise ratio (SNR) of this device increased from 15dB to 28dB, and the crack identification accuracy improved from 65% to 92%. Furthermore, the quick-assembly design of the variable-diameter flange 7 shortens deployment time by 40%, and the 5000mAh, 12V lithium-ion battery pack 10 provides power for continuous operation for 8 hours, fully meeting the needs of all-weather exploration.

[0040] Example 2: Application in Aquifer Geological Exploration

[0041] In aquifers or high-humidity geological environments, the device in this embodiment demonstrates excellent waterproof performance and adaptability to complex environments. Taking a groundwater resource exploration project as an example, the target borehole depth is 20m, the borehole diameter is 150mm, and there is a large amount of seepage water inside the borehole (water pressure 0.3MPa, water temperature 10℃).

[0042] The internal cable of probe 12 can utilize a double-layer TPU insulation and copper mesh shielding structure, with an IP68-rated waterproof connector at the end. The reducing flange 7 is made of 316L stainless steel, with a 1.5mm thick fluororubber sealing ring added between the flange surfaces, thus tightly connecting the camera system and the low-light night vision device to form a sealed cavity. This sealed cavity is filled with dry nitrogen gas of ≥99.99% purity, maintained at a pressure of 1.1 atm. The specific pressure value can be monitored in real time by the pressure sensor 2, effectively isolating external moisture and corrosive gases.

[0043] Under conditions where the ambient illuminance inside the aperture is ≤0.05 lux, the image intensifier 9 of the low-light night vision device increases the optical signal gain to 450 cd / m². 2 / lux, combined with the dynamic dimming function of the LED light source 4, ensures that clear images can be obtained for different rock layers, such as basalt with a reflectivity of 5% and limestone with a reflectivity of 25%. Optionally, a hydrophobic film is coated on the objective lens system 11 to ensure high light transmittance in humid environments. The distance between the output end of the eyepiece system 8 and the conical mirror 5 is precisely controlled at 5-10mm, preferably 8mm (tolerance ±0.1mm), to avoid light scattering caused by water mist condensation.

[0044] After the images captured by the CCD optical sensor 2 are transmitted to the ground workstation via the cable in the probe 12, the image processing module uses an adaptive filtering algorithm to eliminate water ripple interference and uses edge detection technology to mark rock fissures and water-bearing channels.

[0045] During one exploration, the device successfully identified a fracture network with a width of 0.2 mm and located three potential water inflow points. The Power 10 lithium-ion battery pack maintained over 85% capacity even at -10℃, sufficient to support continuous operation for 6 hours. Furthermore, the magnetic compass 6 data showed a fitting error of ≤1.2% with the borehole trajectory, significantly improving the accuracy of the hydrological model.

[0046] To test the extreme performance of the device in this embodiment, in a simulated high-pressure deep-hole environment (pressure 2MPa, humidity 95%), the sealed cavity automatically adjusted the internal and external pressure difference through a pressure compensation valve. After 24 hours of continuous operation, the device showed no leakage or performance degradation. The image intensifier 9 still outputs an image with an SNR ≥ 20dB under 0.01 lux illumination, verifying its reliability in extreme environments.

[0047] As can be seen from the above embodiments, this utility model device exhibits significant advantages in both coal mine and aquifer exploration. The modular design achieves seamless integration of low-light night vision and panoramic imaging; the variable-diameter flange 7 ensures stable mechanical connections and adapts to different apertures; the synergistic effect of the image intensifier 9 and the conical reflector 5 significantly improves image resolution in low-light environments; and the waterproof and extendable characteristics of the probe 12 further expand its application scenarios. Furthermore, intelligent image processing technology significantly reduces the need for manual intervention, improving exploration efficiency and accuracy by more than 40% compared to traditional systems, providing a high-precision and high-reliability solution for geological engineering.

[0048] This specification provides a detailed description of the principles and implementation methods of this utility model. This description is solely for the purpose of aiding understanding the implementation methods and core concepts of this utility model. Those skilled in the art may make appropriate adjustments and improvements to the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be considered as a limitation of this utility model.

Claims

1. A low-light night vision hole-mounted television viewing device, characterized in that, include: The camera system includes a housing (1) and a CCD optical sensor (2), a camera lens (3), a light source (4) and a conical reflector (5) disposed inside the housing (1), wherein the light source (4) is located between the conical reflector (5) and the camera lens (3); The low-light night vision device includes an objective lens system (11), an image intensifier (9), a power supply (10), and an eyepiece system (8). The objective lens system (11) is located at the input end of the low-light night vision device. The image intensifier (9) is connected between the objective lens system (11) and the eyepiece system (8). The power supply (10) is symmetrically arranged on both sides of the image intensifier (9). A variable diameter flange (7) is detachably connected to the housing (1) and the eyepiece system (8). The upper diameter of the variable diameter flange (7) matches the housing (1), and the lower diameter matches the eyepiece system (8). The probe (12) penetrates the outer shell (1) and the low-light night vision device, and integrates a cable inside and is electrically connected to the CCD optical sensor (2), the light source (4) and the power supply (10); The light emitted by the light source (4) is reflected by the inner wall of the exploration hole, and then enhanced by the objective lens system (11) and the image intensifier (9) in sequence. It is then transmitted to the conical mirror (5) through the eyepiece system (8), and finally the panoramic drilling image is generated by the CCD optical sensor (2).

2. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: The photocathode surface of the image intensifier (9) coincides with the back focal plane of the objective lens system (11), and the brightness gain coefficient of the image intensifier (9) is not less than 450 cd / m. 2 / lux.

3. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: The reflecting surface of the conical reflector (5) is a conical curved surface, and its central axis coincides with the optical axis of the camera lens (3), which is used to convert the annular reflection image of the cylindrical surface of the exploration hole into a planar image.

4. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: A magnetic compass (6) is fixed to the bottom of the housing (1) of the camera system, and the axis of the magnetic compass (6) is parallel to the extension direction of the probe (12).

5. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: The probe (12) is a multi-section telescopic structure, and its internal cable is connected to the external image processing equipment through a waterproof connector.

6. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: The light source (4) is an LED array with a wavelength range of 400-700nm, and its light intensity is remotely adjusted by the cable inside the probe (12).

7. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: The optical axes of the objective lens system (11) and the eyepiece system (8) are coincident, and the distance between the output end face of the eyepiece system (8) and the input end face of the conical mirror (5) is 5-10 mm.

8. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: The device also includes an image processing module, which receives the electrical signal output by the CCD optical sensor (2) and uses an algorithm to restore the ring-shaped panoramic image into an unfolded planar image of the borehole wall.

9. The low-light night vision hole-in-television viewing device according to claim 1, characterized in that: The outer shell (1) and the low-light night vision device form a closed cavity through a variable diameter flange (7), and the closed cavity is filled with inert gas.

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