A temperature-based fast focusing device for infrared thermal imaging

Abstract

The utility model provides a kind of based on temperature's fast focusing device of measuring infrared thermal imaging, specifically related to infrared thermal imaging equipment technical field, including focusing ring component, module component, high-precision stepper motor, module component and microswitch etc. Core components, wherein, focusing ring component integration adjustment code disc and miniature pair of light fiber, module component is built-in infrared movement, and precision focusing is realized by the synergic cooperation of mechanical structure and electronic control. The device supports three kinds of flexible switching focusing mode: manual mode is guided operation with quantitative definition index, automatic mode focuses on the hottest point or set temperature threshold area of scene, and hybrid mode can be specified area after automatic precision focusing. The utility model realizes one-key fast focusing, improves efficiency and precision, reduces experience dependence to operator, adapts industry inspection, emergency response and the like scene, guarantees infrared temperature measurement data accurate and comparable, optimizes temperature measurement whole process.

Description

Technical Field

[0001] This invention provides a rapid focusing device for infrared thermal imaging based on temperature measurement, specifically relating to the field of infrared thermal imaging equipment technology. Background Technology

[0002] Currently, focusing methods in infrared thermal imaging equipment are mainly divided into two categories: manual focusing and automatic focusing. However, both modes have significant technical shortcomings in practical applications, failing to meet the demands of high-precision and high-efficiency infrared temperature measurement scenarios. From an operational perspective, traditional focusing requires manual or automatic focusing before starting the temperature measurement operation. If the target object shifts or environmental conditions fluctuate during this process, the entire focusing process must be re-executed, directly interrupting the temperature measurement operation and severely impacting work continuity. Furthermore, infrared lenses are susceptible to thermal expansion and contraction due to changes in ambient temperature, causing the lens's physical position to shift and leading to thermal drift. Even if a clear focus has been achieved initially, the image will gradually blur with continuous changes in ambient temperature, ultimately compromising the long-term stability of the focusing state and causing continuous interference with the accuracy of the temperature measurement data. Utility Model Content

[0003] In view of the shortcomings of the existing technology, this utility model provides a rapid focusing device for infrared thermal imaging based on temperature measurement, which can effectively solve the related technical problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A temperature-based infrared thermal imaging fast focusing device includes: The focusing ring assembly comprises a cavity cylinder, a first sealing ring, a manual adjustment ring, and a bottom cover assembly. The first sealing ring is embedded in a circumferential annular groove on the outer wall of the cavity cylinder. The manual adjustment ring is a prismatic member fitted onto the outside of the cavity cylinder along its axial direction. The bottom cover assembly is fixed to one end of the manual adjustment ring and includes a bottom cover, a circuit board, and a miniature through-beam optical fiber. The circuit board is fastened to the groove of the bottom cover with screws, and the miniature through-beam optical fiber is rigidly connected to the circuit board.

[0005] Furthermore, the inner ring wall of the manual adjustment ring is designed with an adjustment code disk, which is rigidly connected to the manual adjustment ring and placed on the miniature through-beam optical fiber.

[0006] Furthermore, it also includes: The lens mounting flange assembly consists of a lens mounting flange and a second sealing ring. The lens mounting flange is mounted on top of the bottom cover, with one end embedded in the hollow cavity of the cavity tube. The second sealing ring is embedded in the annular mounting groove at the front end of the lens mounting flange.

[0007] Furthermore, it also includes: The module assembly consists of a module and a heat insulation ring. One end of the module assembly is fitted into the cavity of the lens mounting flange assembly. The heat insulation ring is fitted onto the outside of the front end of the module, and its two sides are fixedly connected to the lens mounting flange assembly by locking screws.

[0008] Furthermore, it also includes: The modular assembly consists of a module mounting base and a module, wherein the cylindrical cavity of the module mounting base is precisely fitted into the module to achieve axial fit; the module and the module mounting base are fastened together by screws.

[0009] Furthermore, the module is equipped with an infrared sensor.

[0010] Furthermore, it also includes: A motor mounting plate, the bottom of which is mounted on the lens mounting flange.

[0011] Furthermore, it also includes: A micro switch is mounted on one side surface of the vertical plate of the motor mounting plate.

[0012] Furthermore, it also includes: A high-precision stepper motor is fixed to one side surface of the vertical plate of the motor mounting plate and is adjacent to the micro switch.

[0013] Furthermore, the device comprises the focusing ring assembly, the lens mounting flange assembly, the module assembly, the modular assembly, the motor mounting plate, the micro switch, and the high-precision stepper motor. The focusing ring assembly is nested outside the lens mounting flange assembly, with its upper part connected and fixed to the lens mounting flange assembly. The module assembly is assembled within the cavity of the lens mounting flange assembly. The modular assembly is fitted onto the outer side of one end of the module assembly. The motor mounting plate is fixedly connected to the lens mounting flange assembly. The micro switch is mounted on one side surface of the vertical plate of the motor mounting plate. The high-precision stepper motor is fixed on the same side of the vertical plate and adjacent to the micro switch.

[0014] Compared with the known prior art, the technical solution provided by this utility model has the following beneficial effects: Firstly, it improves focusing accuracy and ease of operation, reducing reliance on experience: This invention utilizes a structured design for the focusing ring assembly, with a rigid connection between the inner ring wall and the adjustment code disk. Furthermore, the miniature through-beam fiber is rigidly fixed to the circuit board and corresponds to the adjustment code disk setting. This allows for real-time capture of displacement signals during manual adjustment, converting them into quantified sharpness indicators. This provides an objective benchmark for manual focusing, avoiding subjective misjudgments of low-contrast infrared images by the human eye. Simultaneously, the high-precision stepper motor and motor mounting plate are rigidly assembled, and combined with the travel limit and position calibration functions of the micro-switch, it can precisely drive the infrared module displacement, achieving millimeter-level precision control for automatic focusing. Both focusing methods rely on structured components to achieve precise operation without experience dependence, allowing even non-professionals to quickly complete focusing, significantly lowering the barrier to entry for the equipment.

[0015] Secondly, it suppresses thermal drift and ensures long-term focusing stability: The heat insulation ring in the module assembly is sleeved on the outer front end of the module and fixed to the lens mounting flange by the locking screw. This effectively blocks the direct impact of ambient temperature changes on the module and lens, and reduces the positional shift of the lens caused by thermal expansion and contraction. At the same time, the sealing structure of the bottom cover assembly and the lens mounting flange assembly can prevent external temperature and humidity fluctuations from entering the equipment, further reducing the interference of temperature changes on core components. This structurally suppresses thermal drift, ensuring that the image after initial focusing remains clear for a long time without the need for frequent refocusing, and ensuring the continuity and accuracy of temperature measurement data.

[0016] Thirdly, it supports flexible switching between multiple modes to adapt to complex scenario requirements: The modular structure design of this utility model provides a stable mechanical and electronic collaborative foundation for three focusing modes: the manual mode relies on the mechanical adjustment of the focusing ring assembly and fiber optic signal feedback; the automatic mode uses the precise drive of a high-precision stepper motor, combined with the temperature sensing function of the infrared core in the module assembly, to focus on the hottest area of ​​the scene or the area with a set temperature threshold; the hybrid mode allows for initial positioning of the target area through the manual adjustment ring, followed by precise focusing within the area driven by the stepper motor. The three modes can be seamlessly switched without additional structural modifications, adapting to different scenarios such as multiple dispersed targets in industrial inspections, rapid aiming in emergency responses, and focusing on small targets in fine temperature measurement, significantly improving the equipment's scenario adaptability. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a rapid focusing device for infrared thermal imaging based on temperature measurement proposed in this utility model. Figure 2 This is a schematic diagram of the code disk adjustment for a rapid focusing device for temperature-based infrared thermal imaging proposed in this utility model. Figure 3 This utility model presents a structural diagram of a lens mounting flange assembly for a rapid focusing device for temperature-based infrared thermal imaging. Figure 4 This is a structural diagram of a rapid focusing device module for infrared thermal imaging based on temperature measurement, as proposed in this utility model. Figure 5 This is a structural diagram of a rapid focusing device module for infrared thermal imaging based on temperature measurement, as proposed in this utility model. Figure 6 This is a schematic diagram of the infrared core of a rapid focusing device for infrared thermal imaging based on temperature measurement proposed in this utility model. Figure 7 This is a schematic diagram of the motor mounting plate of a rapid focusing device for infrared thermal imaging based on temperature measurement, as proposed in this utility model. Figure 8 This is a schematic diagram of a micro-switch for a rapid focusing device for temperature-based infrared thermal imaging proposed in this utility model.

[0018] The labels in the diagram represent: 1-Focusing ring assembly, 11-Cavity cylinder, 12-First sealing ring, 13-Manual adjustment ring, 131-Adjustment code disk, 14-Bottom cover assembly, 141-Bottom cover, 142-Circuit board, 143-Miniature through-beam fiber, 2-Lens mounting flange assembly, 21-Lens mounting flange, 22-Second sealing ring, 3-Module assembly, 31-Module, 32-Heat insulation ring, 4-Module assembly, 41-Module mounting base, 42-Module, 5-Motor mounting plate, 6-Micro switch, 7-High-precision stepper motor. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments.

[0020] Existing infrared thermal imaging focusing devices have significant drawbacks in terms of operational efficiency, focusing accuracy, stability, and intelligent adaptability, and can no longer meet the current requirements for high-precision, high-efficiency, and high-stability infrared temperature measurement applications. Specifically, these drawbacks are as follows: In manual focus mode, operation relies entirely on the operator repeatedly rotating the focus ring and judging the focus effect by observing the image sharpness with the human eye. This is not only cumbersome and extremely slow, severely impacting work efficiency in scenarios such as industrial inspection and emergency response, but also highly subjective and uncertain in judging the sharpness of infrared images, especially low-contrast infrared images. Different operators or even the same operator at different times can easily have different focusing judgments, resulting in poor consistency in focusing accuracy and a lack of effective comparability of temperature measurement data. Furthermore, this mode requires a high level of professional experience from the operator, necessitating extensive training to master focusing techniques, further limiting its applicability and ease of use.

[0021] In autofocus mode, its focusing logic is based solely on image feature analysis, lacking targeted target recognition and intent perception capabilities. On the one hand, when there are multiple objects with small temperature differences in the scene, or when there are obstructions such as grilles in the foreground, the autofocus system struggles to accurately identify the true temperature measurement target, easily leading to focusing deviations and distorted temperature measurement data. On the other hand, the pure automatic mode cannot meet the user's professional focusing needs. For example, when the user needs to accurately measure the temperature of a fine small target on the object being measured, the system often focuses on the entire surface of the object being measured, failing to achieve targeted focusing and making it difficult to meet the requirements of refined temperature measurement scenarios.

[0022] Furthermore, the existing focusing and temperature measurement processes in infrared thermal imaging equipment are poorly designed. Focusing must be completed and the image confirmed to be clear before temperature measurement can begin. If the target moves or environmental conditions change during measurement, the focusing process must be restarted, interrupting the measurement and further reducing efficiency. Simultaneously, infrared lenses are susceptible to thermal expansion and contraction due to ambient temperature changes, causing lens misalignment and thermal drift. This results in initially clear images gradually becoming blurry with temperature variations, severely impacting long-term focusing stability and ultimately reducing temperature measurement accuracy.

[0023] To overcome the aforementioned drawbacks, the present invention adopts the following embodiments to overcome the current situation.

[0024] Example 1: Reference Appendix Figure 1 This is a schematic diagram of a rapid focusing device for temperature-based infrared thermal imaging, which includes: The focusing ring assembly 1 comprises a cavity cylinder 11, a first sealing ring 12, a manual adjustment ring 13, and a bottom cover assembly 14. The first sealing ring 12 is embedded in a circumferential annular groove on the outer wall of the cavity cylinder 11. The manual adjustment ring 13 is a prismatic member that is fitted onto the outside of the cavity cylinder 11 along its axial direction. The bottom cover assembly 14 is fixed to one end of the manual adjustment ring 13 and includes a bottom cover 141, a circuit board 142, and a miniature through-beam optical fiber 143. The circuit board 142 is fastened to the groove of the bottom cover 141 with screws, and the miniature through-beam optical fiber 143 is rigidly connected to the circuit board 142.

[0025] In this embodiment, the cavity tube 11 provides a rigid support frame for the focusing ring assembly 1. Its axial positioning characteristics ensure that the manual adjustment ring 13 moves along a fixed axis, avoiding radial offset during adjustment, ensuring the linear correspondence between adjustment action and lens displacement during manual focusing, and mechanically avoiding focusing accuracy deviation caused by adjustment offset.

[0026] The manual adjustment ring 13, with its prismatic components mounted along the axis of the cavity tube, is designed to facilitate the operator's grip and application of force, while ensuring stable sliding along the axis of the cavity tube during adjustment. This enables controllable and uniform adjustment of the focusing ring, providing a stable mechanical adjustment basis for subsequent quantification of sharpness indicators to guide focusing.

[0027] The circuit board 142 is secured to the groove of the bottom cover 141 with screws: this ensures the installation accuracy of the circuit board and isolates it from external impacts and vibrations, preventing displacement of the circuit board due to equipment movement or operating vibrations, which would affect the stability of signal processing. The miniature through-beam fiber optic cable 143 is rigidly connected to the circuit board 142: this ensures the fixed installation posture of the miniature through-beam fiber optic cable, enabling it to accurately capture the displacement changes of the adjustment code disk driven by the manual adjustment ring 13. When the operator rotates the manual adjustment ring, the grooves of the adjustment code disk pass through the detection area of ​​the miniature through-beam fiber optic cable. The fiber optic cable converts the displacement signal into an optical signal, which is then converted into an electrical signal by the circuit board 142 and transmitted to the main control board. This provides raw displacement data for real-time display of sharpness indicators in manual mode, realizing a closed loop of manual adjustment and signal feedback, and solving the drawback of traditional manual focusing relying on subjective judgment by the human eye.

[0028] The core function of the first sealing ring 12 is to achieve sealing and protection; the core function of the bottom cover assembly 14 is to achieve rigid fixation and modular integration inside the focusing ring assembly.

[0029] like Figure 2 As shown, in another embodiment, the inner ring wall of the manual adjustment ring 13 is designed with an adjustment code disk 131, which is rigidly connected to the manual adjustment ring 13 and placed on the miniature through-beam fiber 143.

[0030] The adjustment encoder 131 is the core signal generating component that connects manual mechanical adjustment with electronic signal feedback. Its function is to convert the angular displacement of the operator's manual adjustment ring 13 into a discrete signal that can be recognized by the fiber optic sensor.

[0031] like Figure 3 As shown, in one embodiment, it further includes: The lens mounting flange assembly 2 consists of a lens mounting flange 21 and a second sealing ring 22. The lens mounting flange 21 is mounted on top of the bottom cover 141, with one end embedded in the hollow cavity of the cavity tube 11. The second sealing ring 22 is embedded in the annular mounting groove at the front end of the lens mounting flange 21.

[0032] The lens mounting flange 21 essentially serves as a mechanical connection bridge, solving the core problem of how to accurately transmit focusing actions to the module. The second sealing ring 22 upgrades and supplements the sealing function of the first sealing ring 12, sealing the gap between the lens mounting flange and subsequent components, blocking external dust, and helping to suppress thermal drift. By reducing the direct impact of external temperature fluctuations on the lens-module joint, it mitigates irregular thermal expansion and contraction caused by temperature differences in this area, preventing accidental displacement of the lens position due to gap changes. like Figure 4 As shown, in one embodiment, it further includes: The module assembly 3 consists of a module 31 and a heat insulation ring 32. One end of the module assembly 3 is fitted into the cavity of the lens mounting flange 2. The heat insulation ring 32 is fitted onto the outside of the front end of the module 31, and its two sides are fixedly connected to the lens mounting flange 2 by locking screws.

[0033] The module 31 typically integrates key components such as an infrared lens assembly and optical filters, and is the core component for receiving infrared radiation and converting it into optical signals. Only when the module 31 is precisely fitted with the lens mounting flange 21 can the optical axis of the infrared lens be completely aligned with the axis of the focusing ring assembly and subsequent module components, avoiding image blurring caused by optical axis misalignment and ensuring the clarity benchmark for focusing from the optical source.

[0034] The function of the heat insulation ring 32 is to block the interference of ambient temperature on the core components of the module and to avoid temperature crosstalk affecting focusing accuracy.

[0035] like Figure 5 As shown, in one embodiment, it further includes: Module component 4 consists of a module mounting base 41 and a module 42. The cylindrical cavity of the module mounting base 41 is precisely fitted into the module 31 to achieve axial fit. The module 42 is fastened to the module mounting base 41 with screws. Module component 4 is the core of temperature measurement; the precise connection between the module mounting base 41 and the outer wall of the module 31 ensures that when the module 31 drives the lens to focus, the optical axis of the lens and the photosensitive surface of the infrared core 421 inside the module 42 always remain perpendicular and centered. If the optical axis is offset, even if the lens is in focus, the core cannot accurately receive the optical signal, which will result in a clear image but inaccurate temperature measurement. Therefore, this connection is the core guarantee for focusing accuracy and temperature measurement accuracy.

[0036] The core function of module 42 is to provide a rigid and interference-resistant mounting carrier for the core components of infrared temperature measurement.

[0037] like Figure 6 As shown, in one embodiment, the module 42 is provided with an infrared sensor 421.

[0038] The infrared detector built into the infrared core 421 receives infrared radiation and converts it into an electrical signal proportional to the radiation intensity. This directly solves the core problem of "who does the focusing serve" and upgrades the entire device from a simple mechanical focusing device to a thermal imaging device with temperature measurement capabilities.

[0039] like Figure 7 As shown, in one embodiment, it further includes: Motor mounting plate 5, the bottom of which is mounted on lens mounting flange 21.

[0040] As a rigid mounting base for the autofocus power component, it ensures drive stability.

[0041] like Figure 8 As shown, in one embodiment, it further includes: Micro switch 6 is mounted on one side surface of the vertical plate of the motor mounting plate 5.

[0042] When the micro switch 6 is triggered, it sends a limit signal to the main control board. The main control board immediately cuts off the drive power of the stepper motor, forcing the motor to stop running. This physically prevents the module from continuing to move, which solves the problem of traditional autofocus devices relying solely on software to estimate the travel distance. It avoids module collisions, lens breakage, or motor stalling and burnout caused by software misjudgment, and is the core guarantee for the safe operation of autofocus.

[0043] In one embodiment, it also includes: A high-precision stepper motor 7 is fixed to one side surface of the vertical plate of the motor mounting plate 5 and is adjacent to the micro switch 6.

[0044] Each time a stepper motor receives an electrical pulse signal, it rotates a fixed angle, which in turn drives the module to produce a fixed linear displacement. This linear correspondence between pulses and displacements allows the main control board to precisely control the number of pulses to achieve on-demand displacement of module 31.

[0045] In one embodiment, the device comprises the focusing ring assembly 1, the lens mounting flange assembly 2, the module assembly 3, the modular assembly 4, the motor mounting plate 5, the micro switch 6, and the high-precision stepper motor 7. The focusing ring assembly 1 is nested outside the lens mounting flange assembly 2, and its upper part is connected and fixed to the lens mounting flange assembly 2. The module assembly 3 is assembled into the cavity of the lens mounting flange assembly 2. The modular assembly 4 is fitted onto the outer side of one end of the module assembly 3. The motor mounting plate 5 is fixedly connected to the lens mounting flange assembly 2. The micro switch 6 is mounted on one side surface of the vertical plate of the motor mounting plate 5. The high-precision stepper motor 7 is fixed on the same side of the vertical plate and adjacent to the micro switch 6.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the present invention.

Claims

1. A rapid focusing device for infrared thermal imaging based on temperature measurement, characterized in that, include: The focusing ring assembly (1) consists of a cavity cylinder (11), a first sealing ring (12), a manual adjustment ring (13), and a bottom cover assembly (14). The first sealing ring (12) is embedded in the circumferential annular groove on the outer wall of the cavity cylinder (11). The manual adjustment ring (13) is a prismatic member that is fitted onto the outside of the cavity cylinder (11) along its axial direction. The bottom cover assembly (14) is fixed to one end of the manual adjustment ring (13) and includes a bottom cover (141), a circuit board (142), and a miniature through-beam fiber (143). The circuit board (142) is fastened to the groove of the bottom cover (141) with screws, and the miniature through-beam fiber (143) is rigidly connected to the circuit board (142).

2. The rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 1, characterized in that, The inner ring wall of the manual adjustment ring (13) is designed with an adjustment code disk (131), which is rigidly connected to the manual adjustment ring (13) and placed on the miniature through-beam fiber (143).

3. The rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 2, characterized in that, Also includes: The lens mounting flange assembly (2) consists of a lens mounting flange (21) and a second sealing ring (22). The lens mounting flange (21) is mounted on top of the bottom cover (141), and one end of it is embedded in the hollow cavity of the cavity tube (11). The second sealing ring (22) is embedded in the annular mounting groove at the front end of the lens mounting flange (21).

4. The rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 3, characterized in that, Also includes: The module assembly (3) consists of a module (31) and a heat insulation ring (32). One end of the module assembly (3) is fitted into the cavity of the lens mounting flange assembly (2). The heat insulation ring (32) is fitted outside the front end of the module (31), and its two sides are fixedly connected to the lens mounting flange assembly (2) by locking screws.

5. A rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 4, characterized in that, Also includes: The module assembly (4) consists of a module mounting base (41) and a module (42). The cylindrical cavity of the module mounting base (41) is precisely fitted with the module (31) to achieve axial fit. The module (42) is fastened to the module mounting base (41) by screws.

6. The rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 5, characterized in that, The module (42) contains an infrared sensor (421).

7. A rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 6, characterized in that, Also includes: The bottom of the motor mounting plate (5) is mounted on the lens mounting flange (21).

8. A rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 7, characterized in that... It also includes: A micro switch (6) is mounted on one side surface of the vertical plate of the motor mounting plate (5).

9. A rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 8, characterized in that... It also includes: A high-precision stepper motor (7) is fixed on one side surface of the vertical plate of the motor mounting plate (5) and is adjacent to the micro switch (6).

10. A rapid focusing device for infrared thermal imaging based on temperature measurement according to claim 9, characterized in that... The device consists of the focusing ring assembly (1), the lens mounting flange assembly (2), the module assembly (3), the module assembly (4), the motor mounting plate (5), the micro switch (6), and the high-precision stepper motor (7). The focusing ring assembly (1) is nested outside the lens mounting flange assembly (2), and its upper part is connected and fixed to the lens mounting flange assembly (2). The module assembly (3) is assembled in the cavity of the lens mounting flange assembly (2). The module assembly (4) is fitted on the outer side of one end of the module assembly (3). The motor mounting plate (5) is fixedly connected to the lens mounting flange assembly (2). The micro switch (6) is installed on one side surface of the vertical plate of the motor mounting plate (5). The high-precision stepper motor (7) is fixed on the same side of the vertical plate and adjacent to the micro switch (6).

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