A method for aligning and detecting optical axis of television infrared common light path
By using a reference target that can be identified by both visible light and infrared light and timing alternation control in the television infrared common optical path system, combined with a wide spectrum beam splitter, synchronous imaging and optical axis consistency detection of the television and infrared channels are realized. This solves the problems of long assembly and adjustment cycles and optical axis consistency, improves assembly and adjustment efficiency and accuracy, and has the function of optical axis drift monitoring.
Patent Information
- Application Number
- CN202611320983.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-28
- Publication Date
- 2026-11-06
AI Technical Summary
Existing TV infrared common-path systems have long assembly and adjustment cycles, are complex to operate, and are difficult to ensure optical axis consistency. They are particularly difficult to achieve efficient and accurate assembly and adjustment in mass production and on-site maintenance.
Using a reference target that can be identified by both visible light and infrared light, combined with time-sequenced control and a wide-spectrum beam splitting component, the optical axis deviation is calculated in real time through image processing and a precision adjustment mechanism is driven to achieve synchronous imaging and optical axis consistency detection of the television and infrared channels.
It shortens the assembly and adjustment cycle, improves the assembly and adjustment accuracy and repeatability, and can complete the assembly, adjustment and testing under ordinary workshop or field conditions. It also has a real-time optical axis drift monitoring function to avoid failures caused by optical axis misalignment.
Smart Images
Figure CN123055873A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of infrared common optical path technology, specifically a method for assembling and adjusting the infrared common optical path and detecting the optical axis of a television. Background Technology
[0002] Infrared common path is an optical system design technique that allows infrared light to share the same optical path with other specific spectra, so that it can be received by the same one or more detectors. This technique aims to solve the problem of complex structure in traditional dual-band optical systems and achieve simultaneous detection of multiple bands.
[0003] In the application of infrared common-path systems, it can be used to design irradiance measurement systems for infrared target simulators, concentrating light energy onto the detector. It can also be used in television infrared common-path systems, switching between large and small fields of view via zoom lens groups. Currently, there are three main methods for detecting and adjusting the optical axis consistency of television and infrared common-path systems:
[0004] Therefore, for common optical path structures, existing methods are usually time-consuming and complex to install and adjust. In mass production installation and on-site maintenance, it is necessary to shorten the installation and adjustment cycle, reduce the difficulty of operation, and improve the repeatability of installation and adjustment accuracy. Therefore, there is an urgent need for a common optical path installation and adjustment and optical axis detection method for television infrared. Summary of the Invention
[0005] The purpose of this invention is to provide a method for common optical path adjustment and optical axis detection of infrared television to solve the problems mentioned in the background art.
[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for assembling and adjusting a common optical path for television infrared, comprising the following steps: S1, establishing a common optical path reference: the television infrared common optical path optical system to be assembled and adjusted is installed on an adjustment platform, and a reference target is set in the optical path at the front end of the objective lens of the common optical path optical system. The reference target has a pattern mark that can be identified by both visible light and infrared light, ensuring that there is a preset geometric relationship between the reference target and the mechanical reference surface of the common optical path optical system. The visible light backlight illumination and infrared thermal radiation adopt a time-sequential alternating control method. During the imaging period of the television channel, the visible light LED light source is turned on and the infrared thermal radiation source is turned off. During the imaging period of the infrared channel, the visible light LED light source is turned off and the infrared thermal radiation source is turned on, so as to avoid mutual interference between spectra. At the same time, the physical position invariance of the reference target is used to ensure the consistency of the measurement reference of the two channels. S2. Beam splitting path configuration: A broadband beam splitting component is configured in the optical path of the common optical system. This broadband beam splitting component is located at the exit pupil of the common optical objective lens, so that the incident beam is split into a visible light band path and an infrared band path, which correspond to the television detection channel and the infrared detection channel, respectively. S3. First Channel Deviation Detection: Using the reference target as the detection reference, the reference target is imaged using the first detection channel that has been initially fixed in the common optical path optical system to obtain the target image of the first detection channel. The coordinate position of the target pattern center on the detection image plane is extracted through image processing and compared with the theoretical optical axis position of the first detection channel to calculate the optical axis deviation vector of the first detection channel. S4. Assembly and Adjustment Execution and Deviation Feedback: The optical axis is corrected by driving the precision adjustment mechanism of the first detection channel according to the deviation vector of the first channel. During the adjustment process, the optical axis deviation vector is calculated in real time and the precision adjustment mechanism is driven in real time. At the same time, the target image of the first channel is continuously acquired to form a closed-loop feedback control until the optical axis deviation vector of the first detection channel is less than the preset threshold, and the assembly and adjustment of the first channel is completed. S5. Second Channel Cross-parameter Detection: After the first detection channel is assembled and adjusted, the optical axis of the first detection channel is kept as the detection reference. The second detection channel is used to image the same reference target to obtain the target image of the second detection channel. The coordinate position of the target pattern center on the image plane of the second detection channel is extracted through image processing, and the optical axis deviation vector of the second detection channel relative to the reference optical axis of the first detection channel is calculated. S6. Second Channel Correction and Full System Verification: The optical axis deviation vector measured in step S5 drives the precision adjustment mechanism of the second detection channel for correction. At the same time, during the correction process, the first and second detection channels are alternately used to image and compare the reference target until the optical axis deviation vectors of both channels are less than the preset threshold. Finally, the two channels are used to simultaneously perform dual-spectral imaging verification on the reference target to confirm that the optical axis consistency of the two channels meets the requirements. S7. Quantitative detection of optical axis consistency: After the entire system is assembled and adjusted, multiple sets of target image data at different field positions are acquired using the same reference target and the beam splitting component of the common optical path optical system. The optical axis deviation at each field position is calculated by the image registration algorithm, and a full field optical axis consistency detection report is generated.
[0007] Preferably, the reference target adopts a metal substrate with a hollowed-out cross structure. A visible light LED light source and an infrared thermal radiation source are configured on the back of the target. The visible light LED light source provides visible light backlight illumination to enable imaging in the television channel, and the infrared thermal radiation source creates a temperature difference between the target pattern and the surrounding environment to enable imaging in the infrared channel, thereby achieving synchronous identification of the same physical target in the television and infrared channels.
[0008] Preferably, in the timing alternation control, a blanking interval is provided between the imaging period of the television channel and the imaging period of the infrared channel, and the exposure timing of the two channels is synchronized with the image acquisition signal to ensure that there is no spectral leakage between adjacent channels.
[0009] Preferably, the broadband beam splitter includes a beam splitter prism, the beam splitter surface of which is coated with a broadband beam splitter film system that also transmits visible light. The beam splitter ratio of the beam splitter film system remains balanced within the operating wavelength range to optimize the distribution of light energy between the television channel and the infrared channel.
[0010] Preferably, the first detection channel is a television detection channel, and the second detection channel is an infrared detection channel.
[0011] Preferably, the precision adjustment mechanism includes micro-adjustment components in at least three degrees of freedom, each degree of freedom being equipped with a differential threaded adjustment structure and a position feedback sensor, so as to achieve micron-level precision adjustment of the optical axis direction of the detection channel.
[0012] Preferably, the full-field optical axis consistency detection in step S7 includes: driving the common optical path optical system to rotate in the azimuth and pitch directions according to a preset step angle by an electric turntable, acquiring reference target images of the TV channel and infrared channel at each sampling position, calculating the optical axis deviation of the two channels point by point, drawing the full-field optical axis consistency distribution curve, and extracting the maximum deviation value and root mean square deviation value as the final detection index.
[0013] Preferably, the method further includes step S8: real-time monitoring of optical axis stability, that is, after the common optical path optical system is assembled and locked, the imaging position of the reference target in the TV channel and infrared channel is collected in real time by the beam splitter, the optical axis drift caused by environmental factors such as temperature change and vibration is monitored, and an optical axis deviation warning signal is output.
[0014] Preferably, the television infrared common optical path assembly and optical axis detection method is applicable to the assembly, testing and maintenance support of the following optical guidance equipment: television infrared composite seeker, optoelectronic pod, airborne optoelectronic aiming system, vehicle-mounted optoelectronic tracking equipment, and shipborne optoelectronic fire control system.
[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: First, in this invention, the reference target used in the assembly and adjustment process is also the reference for the final optical axis detection, eliminating the reference inconsistency error caused by using one target for assembly and another collimator for detection in traditional methods. The deviation is calculated in real time through image processing and the adjustment mechanism is driven, and the assembly and adjustment consistency is greatly improved. It can output a spatial distribution map of the optical axis deviation, providing a visual basis for the diagnosis of optical design defects and the improvement of assembly and adjustment process. It does not require a large collimator and a darkroom environment, and can complete the assembly, adjustment and detection under ordinary workshop or field conditions.
[0016] Secondly, this invention can automatically monitor optical axis drift during equipment service, helping to determine the reliability and lifespan of the optical system and avoid guidance failure accidents caused by optical axis misalignment. When the optical axis deviation exceeds the warning threshold, an alarm is automatically triggered, prompting maintenance personnel to perform timely calibration, avoiding mission interruptions caused by passive fault repair. The recorded drift curve can be used to analyze the influence of environmental factors such as temperature and vibration on optical axis stability, providing data support for subsequent design improvements. Real-time monitoring extends the equipment overhaul cycle and reduces unnecessary disassembly and calibration work, making it particularly suitable for shipborne, airborne, and other platforms that are difficult to maintain frequently. Attached Figure Description
[0017] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] This invention provides the following technical solutions: Example 1 Please see Figure 1 A method for assembling and adjusting a common optical path for infrared television and detecting its optical axis includes the following steps: S1, establishing a common optical path reference: the common optical path system for infrared television to be assembled is installed on an adjustment platform, and a reference target is set in the optical path at the front end of the objective lens of the common optical path system. The reference target has a pattern mark that can be identified by both visible light and infrared light, ensuring that there is a preset geometric relationship between the reference target and the mechanical reference surface of the common optical path system. The visible light backlight illumination and infrared thermal radiation are controlled by a time-sequential alternation method. During the imaging period of the television channel, the visible light LED light source is turned on and the infrared thermal radiation source is turned off. During the imaging period of the infrared channel, the visible light LED light source is turned off and the infrared thermal radiation source is turned on to avoid mutual interference between spectra. At the same time, the physical position invariance of the reference target is used to ensure the consistency of the measurement reference of the two channels. S2. Beam splitting path configuration: A broadband beam splitting component is configured in the optical path of the common optical system. This broadband beam splitting component is located at the exit pupil of the common optical objective lens, so that the incident beam is split into a visible light band path and an infrared band path, which correspond to the television detection channel and the infrared detection channel, respectively. S3. First Channel Deviation Detection: Using the reference target as the detection reference, the reference target is imaged using the first detection channel that has been initially fixed in the common optical path optical system to obtain the target image of the first detection channel. The coordinate position of the target pattern center on the detection image plane is extracted through image processing and compared with the theoretical optical axis position of the first detection channel to calculate the optical axis deviation vector of the first detection channel. S4. Assembly and Adjustment Execution and Deviation Feedback: The optical axis is corrected by driving the precision adjustment mechanism of the first detection channel according to the deviation vector of the first channel. During the adjustment process, the optical axis deviation vector is calculated in real time and the precision adjustment mechanism is driven in real time. At the same time, the target image of the first channel is continuously acquired to form a closed-loop feedback control until the optical axis deviation vector of the first detection channel is less than the preset threshold, and the assembly and adjustment of the first channel is completed. S5. Second Channel Cross-parameter Detection: After the first detection channel is assembled and adjusted, the optical axis of the first detection channel is kept as the detection reference. The second detection channel is used to image the same reference target to obtain the target image of the second detection channel. The coordinate position of the target pattern center on the image plane of the second detection channel is extracted through image processing, and the optical axis deviation vector of the second detection channel relative to the reference optical axis of the first detection channel is calculated. S6. Second Channel Correction and Full System Verification: The optical axis deviation vector measured in step S5 drives the precision adjustment mechanism of the second detection channel for correction. At the same time, during the correction process, the first and second detection channels are alternately used to image and compare the reference target until the optical axis deviation vectors of both channels are less than the preset threshold. Finally, the two channels are used to simultaneously perform dual-spectral imaging verification on the reference target to confirm that the optical axis consistency of the two channels meets the requirements. S7. Quantitative detection of optical axis consistency: After the entire system is assembled and adjusted, multiple sets of target image data at different field positions are acquired using the same reference target and the beam splitting component of the common optical path optical system. The optical axis deviation at each field position is calculated by the image registration algorithm, and a full field optical axis consistency detection report is generated.
[0020] The reference target adopts a metal substrate with a hollowed-out cross structure. The back of the target is equipped with a visible light LED light source and an infrared thermal radiation source. The visible light LED light source provides visible light backlight illumination to enable imaging in the television channel, and the infrared thermal radiation source creates a temperature difference between the target pattern and the surrounding environment to enable imaging in the infrared channel, thereby achieving synchronous identification of the same physical target in the television and infrared channels.
[0021] The target substrate is made of Invar steel, which has a small coefficient of linear expansion. A visible light LED light panel and an electric heating film are attached to the back of the cross-shaped hollowed-out target. The electric heating film is kept at a constant temperature by a PID controller. The entire target is encapsulated in a shell with a heat-conducting window, and the shell is filled with dry nitrogen to prevent condensation. The same physical target emits visible light and infrared radiation simultaneously, enabling clear imaging by both the television and infrared detectors. This fundamentally ensures the consistency of the measurement reference for the two channels and avoids alignment errors caused by target replacement or movement. Compared with the high-temperature cross wire targets commonly used in the prior art, the Invar steel substrate hollowed-out cross structure used in this application has significant differences. Invar steel has an extremely low coefficient of linear expansion, and the geometric drift of the target pattern is minimal when the temperature changes, ensuring long-term stability. The hollowed-out cross design ensures that the visible light backlight and infrared thermal radiation do not block each other and can be independently controlled. The visible light LED and infrared thermal radiation source are set separately and combined with time-sequential alternating control to completely eliminate spectral crosstalk. In contrast, traditional high-temperature cross wire targets rely on resistance heating of the entire target, resulting in the simultaneous generation and mutual interference of visible light and infrared radiation, making it difficult to achieve clear and independent imaging of the two channels.
[0022] In the timing alternation control, a blanking interval is set between the imaging period of the TV channel and the imaging period of the infrared channel, and the exposure timing of the two channels is synchronized with the image acquisition signal to ensure that there is no spectral leakage between adjacent channels.
[0023] The control circuit is implemented by FPGA and outputs two switching signals: one to drive the MOSFET switch of the visible light LED and the other to drive the solid-state relay of the infrared thermal radiation source. The timing is set as follows: during the exposure period of the TV channel, the LED is turned on and the thermal radiation source is turned off. After an interval of 10ms, during the exposure period of the infrared channel, the LED is turned off and the thermal radiation source is turned on. The image acquisition of the two channels is synchronized with this timing. The timing separation completely eliminates the mutual interference between visible light and infrared radiation. At the same time, since the target position remains unchanged, the target images acquired by the two channels still correspond to the same spatial position, ensuring the consistency of the measurement reference.
[0024] The broadband beam splitter includes a beam splitter prism whose beam splitting surface is coated with a broadband beam splitting film system that also transmits visible light. The beam splitting ratio of the beam splitting film system remains balanced within the operating wavelength range to optimize the distribution of light energy between the television channel and the infrared channel.
[0025] This beam splitter can achieve high-efficiency beam splitting over a wide spectral range, ensuring that both the television channel and the infrared channel have sufficient light energy. At the same time, the film system design makes the distribution of light energy between the two channels relatively balanced, avoiding the signal of one channel being too weak.
[0026] The first detection channel is a television detection channel, and the second detection channel is an infrared detection channel.
[0027] Television detectors typically have higher resolution and more sophisticated image processing algorithms. Using the television channel as a reference first helps improve the detection accuracy of the subsequent infrared channel.
[0028] The precision adjustment mechanism includes micro-adjustment components in at least three degrees of freedom, each equipped with a differential threaded adjustment structure and a position feedback sensor to achieve micron-level precision adjustment of the optical axis of the detection channel.
[0029] The differential thread structure ensures both a large adjustment range and high-resolution adjustment down to the micrometer level. A position feedback sensor enables the control system to accurately determine the current adjustment amount, avoiding mechanical backlash and slippage.
[0030] Step S7, full-field optical axis consistency detection, includes: using an electric turntable to drive the common optical path system to rotate in the azimuth and elevation directions according to a preset step angle, acquiring reference target images of the TV channel and infrared channel at each sampling position, calculating the optical axis deviation of the two channels point by point, plotting the full-field optical axis consistency distribution curve, and extracting the maximum deviation value and root mean square deviation value as the final detection index.
[0031] The electric rotary table uses a high-precision direct-drive motor, and the table controller communicates with the industrial computer via Ethernet. Users can set the scanning range, step size, and dwell time through the software interface. Ten frames are acquired at each sampling point and averaged to reduce noise. Data processing employs a cross-correlation image registration algorithm to calculate the relative offset of the crosshair target in the two-channel images, which is then converted into angular deviation based on the focal length of the optical system. The automated scanning of the electric rotary table improves detection efficiency and repeatability. The multi-frame averaging and cross-correlation registration algorithms reduce random noise and quantization errors, making the detection results more reliable.
[0032] Through the above technical solution, an integrated process is realized for the TV infrared common-path optical system, from reference establishment, beam splitting configuration, first channel closed-loop assembly and adjustment, second channel cross-parameter calibration to full-field quantitative detection. This solution uses the same reference target as a shared reference for the TV channel and the infrared channel. Combined with a wide-spectrum beam splitting component and time-sequential alternating illumination control, it can complete the precise assembly and adjustment of the optical axis consistency of the two channels and the full-field performance evaluation without the need for external collimators or theodolites. Compared with the prior art, this invention shortens the assembly and adjustment cycle, improves the assembly and adjustment accuracy and repeatability, and is especially suitable for space-constrained production line assembly and adjustment and on-site maintenance support scenarios.
[0033] Example 2 Please see Figure 1A method for assembling and adjusting the common optical path of a television infrared system and detecting the optical axis, the method further includes step S8: real-time monitoring of optical axis stability, that is, after the common optical path optical system is assembled and locked, the imaging position of the reference target in the television channel and the infrared channel is collected in real time by the beam splitter, the optical axis drift caused by environmental factors such as temperature change and vibration is monitored, and an optical axis deviation warning signal is output.
[0034] Real-time monitoring can promptly detect optical axis drift caused by temperature changes, mechanical vibration, or material creep, providing data support for preventive maintenance and health management of equipment, and is especially suitable for optoelectronic systems that have been in service for a long time.
[0035] The TV infrared common-path assembly and optical axis detection method is applicable to the assembly, testing, and maintenance of the following optical guidance equipment: TV infrared composite seeker, optoelectronic pod, airborne optoelectronic aiming system, vehicle-mounted optoelectronic tracking equipment, and shipborne optoelectronic fire control system.
[0036] In use, the system to be installed is placed on the adjustment platform. A reference target is set at the front of the objective lens, and the relationship between the target and the mechanical reference plane is calibrated. A broadband beam splitter is installed at the exit pupil position, and the television channel and infrared channel are connected. The visible light LED is turned on, and the television channel acquires the target image. The center deviation is calculated, and the closed-loop drive precision adjustment mechanism is repeated until the deviation is less than the threshold. The television channel is locked, and the infrared thermal radiation source is turned on. The infrared channel acquires the target image, and the deviation is calculated with the optical axis of the television channel as the reference. The closed-loop adjustment of the infrared channel alternately images for comparison. After both channels meet the standard, they are verified synchronously. The system is placed on the electric turntable and scanned at a preset step angle. The deviation of the two channels is calculated point by point, and the distribution curve is plotted. The maximum deviation and RMS deviation reports are output. After the system is locked, it enters the monitoring mode and periodically acquires the target image. The system alarms when the optical axis drift exceeds the threshold.
[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A method for adjusting and detecting the optical axis of a television infrared common optical path, characterized in that: Includes the following steps: S1. Establishment of Common Optical Path Reference: The television infrared common optical path system to be adjusted is installed on the adjustment platform. A reference target is set in the optical path at the front end of the objective lens of the common optical path system. The reference target has a pattern mark that can be identified by both visible light and infrared light. It is ensured that there is a preset geometric relationship between the reference target and the mechanical reference surface of the common optical path system. The visible light backlight illumination and infrared thermal radiation adopt a time-sequential alternating control method. During the imaging period of the television channel, the visible light LED light source is turned on and the infrared thermal radiation source is turned off. During the imaging period of the infrared channel, the visible light LED light source is turned off and the infrared thermal radiation source is turned on to avoid mutual interference between spectra. At the same time, the physical position invariance of the reference target is used to ensure the consistency of the measurement reference of the two channels. S2. Beam splitting path configuration: A broadband beam splitting component is configured in the optical path of the common optical system. This broadband beam splitting component is located at the exit pupil of the common optical objective lens, so that the incident beam is split into a visible light band path and an infrared band path, which correspond to the television detection channel and the infrared detection channel, respectively. S3. First Channel Deviation Detection: Using the reference target as the detection reference, the reference target is imaged using the first detection channel that has been initially fixed in the common optical path optical system to obtain the target image of the first detection channel. The coordinate position of the target pattern center on the detection image plane is extracted through image processing and compared with the theoretical optical axis position of the first detection channel to calculate the optical axis deviation vector of the first detection channel. S4. Assembly and Adjustment Execution and Deviation Feedback: The optical axis is corrected by driving the precision adjustment mechanism of the first detection channel according to the deviation vector of the first channel. During the adjustment process, the optical axis deviation vector is calculated in real time and the precision adjustment mechanism is driven in real time. At the same time, the target image of the first channel is continuously acquired to form a closed-loop feedback control until the optical axis deviation vector of the first detection channel is less than the preset threshold, and the assembly and adjustment of the first channel is completed. S5. Second Channel Cross-parameter Detection: After the first detection channel is assembled and adjusted, the optical axis of the first detection channel is kept as the detection reference. The second detection channel is used to image the same reference target to obtain the target image of the second detection channel. The coordinate position of the target pattern center on the image plane of the second detection channel is extracted through image processing, and the optical axis deviation vector of the second detection channel relative to the reference optical axis of the first detection channel is calculated. S6. Second Channel Correction and Full System Verification: The optical axis deviation vector measured in step S5 drives the precision adjustment mechanism of the second detection channel for correction. At the same time, during the correction process, the first and second detection channels are alternately used to image and compare the reference target until the optical axis deviation vectors of both channels are less than the preset threshold. Finally, the two channels are used to simultaneously perform dual-spectral imaging verification on the reference target to confirm that the optical axis consistency of the two channels meets the requirements. S7. Quantitative detection of optical axis consistency: After the entire system is assembled and adjusted, multiple sets of target image data at different field positions are acquired using the same reference target and the beam splitting component of the common optical path optical system. The optical axis deviation at each field position is calculated by the image registration algorithm, and a full field optical axis consistency detection report is generated.
2. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: The reference target adopts a metal substrate with a hollowed-out cross structure. A visible light LED light source and an infrared thermal radiation source are configured on the back of the target. The visible light LED light source provides visible light backlight illumination to enable imaging in the television channel, and the infrared thermal radiation source creates a temperature difference between the target pattern and the surrounding environment to enable imaging in the infrared channel, thereby achieving synchronous identification of the same physical target in the television and infrared channels.
3. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: In the timing alternation control, a blanking interval is provided between the imaging period of the TV channel and the imaging period of the infrared channel, and the exposure timing of the two channels is synchronized with the image acquisition signal to ensure that there is no spectral leakage between adjacent channels.
4. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: The broadband beam splitting component includes a beam splitting prism, whose beam splitting surface is coated with a broadband beam splitting film system that also transmits visible light. The beam splitting ratio of the beam splitting film system remains balanced within the operating wavelength range to optimize the distribution of light energy between the television channel and the infrared channel.
5. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: The first detection channel is a television detection channel, and the second detection channel is an infrared detection channel.
6. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: The precision adjustment mechanism includes micro-adjustment components in at least three degrees of freedom, each with a differential threaded adjustment structure and a position feedback sensor, to achieve micron-level precision adjustment of the optical axis of the detection channel.
7. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: The full-field optical axis consistency detection in step S7 includes: driving the common optical path optical system to rotate in the azimuth and pitch directions according to a preset step angle by an electric turntable, acquiring reference target images of the TV channel and infrared channel at each sampling position, calculating the optical axis deviation of the two channels point by point, drawing the full-field optical axis consistency distribution curve, and extracting the maximum deviation value and root mean square deviation value as the final detection index.
8. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: The method further includes step S8: real-time monitoring of optical axis stability, that is, after the common optical path optical system is assembled, adjusted and locked, the imaging position of the reference target in the TV channel and infrared channel is collected in real time by the beam splitter, the optical axis drift caused by environmental factors such as temperature change and vibration is monitored, and an optical axis deviation warning signal is output.
9. The method for common optical path adjustment and optical axis detection of television infrared according to claim 1, characterized in that: The aforementioned TV infrared common optical path assembly and optical axis detection method is applicable to the assembly, testing, and maintenance support of the following optical guidance equipment: TV infrared composite seeker, optoelectronic pod, airborne optoelectronic aiming system, vehicle-mounted optoelectronic tracking equipment, and shipborne optoelectronic fire control system.