Method for adjusting optical axis of large-caliber shipboard multi-spectral oil spill photoelectricity

Abstract

The application discloses a kind of super-large caliber shipborne multispectral oil spill photoelectric optical axis adjustment methods, first, collimator theodolite and large-caliber collimator are aligned;Multispectral oil spill photoelectricity is placed between large-caliber collimator and collimator theodolite;Then, the high-power ultraviolet laser in cassegrain detection system is replaced by collimating 780nm light source, and the light emitted by collimating 780nm light source is focused to the target surface center of large-caliber collimator;Finally, by adjusting the position of multispectral oil spill photoelectricity, the optical axis of visible light imaging system and the optical axis of emission light path are parallel in order, the optical axis of mid-wave infrared imaging system and the optical axis of visible light imaging system are parallel, the optical axis of laser range finder and the optical axis of mid-wave infrared imaging system are parallel, to realize the optical axis adjustment of multispectral oil spill photoelectricity.The application can complete the optical axis adjustment of multispectral oil spill photoelectricity on the basis of existing caliber collimator, without the need to increase other equipment, reduce cost.

Description

Technical Field

[0001] This invention belongs to the field of optical technology, specifically relating to a method for adjusting the optical axis of an ultra-large aperture shipborne multispectral oil spill photoelectric system. Background Technology

[0002] The increasing frequency of sudden oil spills at sea in recent years has caused significant damage to the marine environment and severely impacted the lives of coastal residents. Current traditional methods for detecting oil spills at sea include photoelectric and radar detection technologies. Radar detection is susceptible to interference from seaweed and marine debris. Photoelectric detection technology, on the other hand, can detect oil spill types using fluorescence technology and combines visible light imaging, infrared imaging, and laser ranging into a multispectral system, enabling day and night target location imaging and distance detection. Therefore, this ultra-large-aperture shipborne multispectral oil spill photoelectric system and its optical axis adjustment method are of paramount importance.

[0003] The main methods for adjusting the optical axis of multispectral optoelectronic systems include projection target plate method, laser optical axis meter method, pentaprism method, and large-aperture collimator method. For example, CN107796337B uses a plane mirror for beam translation; CN102589605A uses a precise optical axis translation and rotation mechanism to adjust the optical axis for different wavelengths; CN109870294A uses a prism to achieve large-range diameter expansion; Xi'an Juxing Company's large-span multi-optical axis parallelism calibrator also uses a precise optical axis translation and rotation mechanism to achieve large-span multispectral calibration; CN109387163A uses a reflective collimator with two sets of mirrors to overcome the collimator aperture limitation and generate parallel beams ranging from several meters to tens of meters; while the projection target plate method is greatly affected by weather; the laser optical axis meter method has a high system assembly difficulty and is highly specialized, and the adjustment method using the optical axis translation concept involves many steps, resulting in complex adjustment; the pentaprism method is greatly affected by the accuracy of movement during the test; the large-aperture collimator method is subject to many limitations of the collimator aperture and is costly. Summary of the Invention

[0004] In view of this, the present invention provides a method for adjusting the optical axis of a large-diameter shipborne multispectral oil spill photoelectric device. Based on the existing diameter collimator, the optical axis of the multispectral oil spill photoelectric device can be adjusted without the need for additional equipment, thus reducing costs.

[0005] This invention is achieved through the following technical solution:

[0006] A method for adjusting the optical axis of an ultra-large aperture shipborne multispectral oil spill photoelectric device, the equipment used in the method includes: a multispectral oil spill photoelectric device, a large aperture collimator, an autocollimating theodolite, a collimating 780nm light source, and a flat crystal; wherein, the aperture of the large aperture collimator is smaller than the hatch aperture of the sensor carrier compartment of the multispectral oil spill photoelectric device.

[0007] The adjustment method is as follows: First, align the autocollimating theodolite with the large-aperture collimator; place the multispectral oil spill photoelectric sensor between the large-aperture collimator and the autocollimating theodolite, and align the Cassegrain detection system of the multispectral oil spill photoelectric sensor with the large-aperture collimator; and attach a flat crystal to the reference surface of the multispectral oil spill photoelectric sensor.

[0008] Then, the high-power ultraviolet laser in the Cassegrain detection system was replaced with a collimated 780nm light source, and the light emitted by the collimated 780nm light source was focused onto the center of the target surface of the large-aperture collimator, and the fluorescent light returning through the large-aperture collimator was focused onto the center of the fluorescence sensor.

[0009] Finally, by adjusting the position of the multispectral oil spill photoelectric sensor and the azimuth and elevation angles of the sensor carrier, the optical axis of the visible light imaging system is made parallel to the optical axis of the emitted light path, the optical axis of the mid-wave infrared imaging system is made parallel to the optical axis of the visible light imaging system, and the optical axis of the laser rangefinder is made parallel to the optical axis of the mid-wave infrared imaging system, thereby achieving the adjustment of the optical axis of the multispectral oil spill photoelectric sensor.

[0010] Furthermore, after attaching a flat crystal to the reference surface of the multispectral oil spill photoelectric sensor, and before replacing the high-power ultraviolet laser in the Cassegrain detection system with a collimated 780nm light source, the azimuth and pitch angles of the sensor carrier are adjusted so that the autocollimating theodolite sees its own crosshairs and the crosshairs reflected by the flat crystal coincide.

[0011] Furthermore, the specific steps for ensuring that the optical axis of the visible light imaging system is parallel to the optical axis of the emitted light path, the optical axis of the mid-wave infrared imaging system is parallel to the optical axis of the visible light imaging system, and the optical axis of the laser rangefinder is parallel to the optical axis of the mid-wave infrared imaging system in sequence are as follows:

[0012] Step 1: Adjust the position of the multispectral oil spill photoelectric device so that part of the light path in the emission light path and the light path of the visible light imaging system are both placed within the effective aperture of the large-aperture collimator;

[0013] Step 2: Adjust the azimuth and elevation angles of the sensor carrier to ensure that the light from the collimated 780nm light source is focused on the center of the target surface by the large-aperture collimator after passing through the emission optical path. Adjust the azimuth and elevation angles of the visible light imaging system relative to the sensor carrier so that the crosshair image of the large-aperture collimator coincides with its own crosshairs, thereby adjusting the optical axis of the visible light imaging system so that the optical axis of the visible light imaging system is parallel to the optical axis of the emission optical path.

[0014] Step 3: Adjust the position of the multispectral oil spill photoelectric sensor and the azimuth and elevation angles of the sensor carrier to ensure that the optical paths of the visible light imaging system and the mid-wave infrared imaging system are both within the effective aperture of the large-aperture collimator. Adjust the azimuth and elevation angles of the visible light imaging system relative to the sensor carrier so that when the crosshairs of the visible light imaging system are aligned with the crosshairs of the large-aperture collimator, the crosshairs of the mid-wave infrared imaging system are also aligned with the crosshairs of the large-aperture collimator. This achieves the adjustment of the optical axis of the mid-wave infrared imaging system, making the optical axis of the mid-wave infrared imaging system parallel to the optical axis of the visible light imaging system.

[0015] Step 4: Adjust the position of the multispectral oil spill photoelectric sensor so that the optical paths of the mid-wave infrared imaging system and the laser rangefinder are both placed within the effective diameter of the large-aperture collimator. Adjust the azimuth and elevation angles of the laser rangefinder relative to the sensor carrier to make the laser emission point of the laser rangefinder converge on the target surface of the large-aperture collimator and at the center of the crosshairs of the mid-wave infrared imaging system. This will adjust the optical axis of the laser rangefinder so that its optical axis is parallel to that of the mid-wave infrared imaging system.

[0016] Furthermore, the Cassegrain detection system includes: an emitting optical path, a receiving optical path, a high-power ultraviolet laser, and a fluorescence sensor; the emitting optical path is equipped with two folding mirrors, and the receiving optical path is equipped with a focusing mirror; the emitting optical path reflects the frequency-doubled near-infrared light emitted by the high-power ultraviolet laser through the two folding mirrors and then collimates it to the target to be detected; the receiving optical path focuses the fluorescence generated at the target oil spill site through the focusing mirror and converges it onto the fluorescence sensor, which then performs photoelectric conversion on the received fluorescence to ultimately analyze whether it is an oil spill point;

[0017] After replacing the high-power ultraviolet laser with a collimated 780nm light source, the method to focus the light emitted by the collimated 780nm light source onto the center of the target surface of the large-aperture collimator is to adjust the angle of the folding mirror; the method to focus the fluorescent light returning from the large-aperture collimator onto the center of the fluorescence sensor is to adjust the front and rear positions of the focusing mirror.

[0018] Furthermore, the placement position and height of the autocollimating theodolite are related to the placement position of the multispectral oil spill photoelectric sensor and the installation position of the flat crystal. When placing the autocollimating theodolite, the orientation of the multispectral oil spill photoelectric sensor can be rotated to align the large-aperture collimating tube and the autocollimating theodolite, and the autocollimating theodolite can also be aligned with the flat crystal.

[0019] Beneficial effects:

[0020] (1) This invention addresses the issue that when the effective aperture of a shipborne multispectral oil spill photoelectric sensor is larger than that of an existing collimator, making it impossible to directly use a large-aperture collimator for debugging, and when one spectral band in the multispectral system cannot be directly imaged by other sensors, it is necessary to adjust the optical axis of the ultra-large-aperture shipborne multispectral oil spill photoelectric sensor. Since the aperture of its sensor carrier compartment is much larger than that of the large-aperture collimator used for debugging, the high-power ultraviolet laser in the Cassegrain detection system is replaced with a collimated 780nm light source, which can conveniently and quickly complete the adjustment of the Cassegrain detection optical path. This overcomes the problems of high-power ultraviolet lasers having too much power, inconvenient components, and invisible optical paths, making debugging difficult. No additional equipment is needed to complete the adjustment of the optical axis of the multispectral oil spill photoelectric sensor, reducing costs.

[0021] (2) This invention adjusts the position of the multispectral oil spill photoelectric sensor and the azimuth and elevation angles of the sensor carrier to ensure that part of the light path in the emission light path and the light path of the visible light imaging system are both placed within the effective aperture of the large-aperture collimator. This allows the collimated 780nm light source to pass through the emission light path and then converge at the center of its target surface via the large-aperture collimator. The azimuth and elevation angles of the visible light imaging system relative to the sensor carrier are adjusted so that the crosshair image of the large-aperture collimator coincides with its own crosshairs. The light paths of both the visible light imaging system and the mid-wave infrared imaging system are placed within the effective aperture of the large-aperture collimator. The azimuth and elevation angles of the visible light imaging system relative to the sensor carrier are adjusted so that the visible light imaging system's own crosshairs coincide with its own crosshairs.

[0022] When the crosshairs are aligned with the crosshairs of the large-aperture collimator, the crosshairs of the mid-wave infrared imaging system are also aligned with the crosshairs of the large-aperture collimator. This ensures that the optical paths of both the mid-wave infrared imaging system and the laser rangefinder are within the effective aperture of the large-aperture collimator. By adjusting the azimuth and elevation angles of the laser rangefinder relative to the sensor housing, the laser emission point of the laser rangefinder is focused on the target surface of the large-aperture collimator and at the center of the crosshairs of the mid-wave infrared imaging system. This step-by-step alignment effectively adjusts the optical axis of the multispectral oil spill photoelectric system.

[0023] (3) This invention uses a collimated 780nm light source to adjust the angle of the folding mirror so that the light is focused on the center of the target surface through a large-aperture collimator; by adjusting the front and rear positions of the focusing mirror, the fluorescent light returning through the large-aperture collimator is better focused on the center of the fluorescence sensor; by using a collimated 780nm light source, the invisible fluorescence is converted into visible red light, and the adjustment of the folding mirror is successfully completed, making the adjustment of the emission and reception optical paths simple, convenient and easy to implement. Attached Figure Description

[0024] Figure 1 This is a structural composition diagram of a multispectral oil spill photoelectric device;

[0025] Figure 2 This is a diagram showing the composition of the equipment used in the optical axis adjustment method of the present invention;

[0026] Among them, 1. Multispectral oil spill photoelectric device; 2. Large-aperture collimator; 3. Collimated 780nm light source; 4. Flat crystal; 5. Autocollimating theodolite; 11. Visible light imaging system; 12. Infrared imaging system; 13. Laser rangefinder; 14. Cassegrain detection system; 16. Sensor carrier; 141. Transmitting optical path; 142. Receiving optical path; 143. High-power ultraviolet laser; 144. Fluorescence sensor; 1411. Folding mirror; 1421. Focusing lens. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] This embodiment provides a method for adjusting the optical axis of an ultra-large caliber shipborne multispectral oil spill photoelectric system. (See attached document.) Figure 1 The multispectral oil spill photoelectric sensor 1 includes: a sensor carrier 16, an elevation frame, and an azimuth mount;

[0029] The pitch mount is mounted on the azimuth seat, and the sensor carrier 16 is mounted on the pitch mount. The azimuth seat is used to adjust the azimuth angle of the sensor carrier 16, and the pitch mount is used to adjust the pitch angle of the sensor carrier 16.

[0030] The sensor housing 16 houses a visible light imaging system 11, a mid-wave infrared imaging system 12, a laser rangefinder 13, and a Cassegrain detection system 14.

[0031] The visible light imaging system 11 is used to perform visible light imaging of oil spill points on the sea surface, the mid-wave infrared imaging system 12 is used to perform infrared imaging of oil spill points on the sea surface, and the laser rangefinder 13 is used to perform laser ranging of oil spill points on the sea surface.

[0032] See appendix Figure 2The Cassegrain detection system 14 is used to detect whether a target on the sea surface is an oil spill point. It includes: a transmitting optical path 141, a receiving optical path 142, a high-power ultraviolet laser 143, and a fluorescence sensor 144. The transmitting optical path 141 is equipped with two folding mirrors 1411, and the receiving optical path 142 is equipped with a focusing lens 1421. The transmitting optical path 141 reflects the frequency-doubled near-infrared light emitted by the high-power ultraviolet laser 143 through the two folding mirrors 1411 and then collimates it towards the target to be detected. The receiving optical path 142 receives the target oil spill point after excitation... The fluorescence is focused by the focusing lens 1421 and converges onto the fluorescence sensor 144. The fluorescence sensor 144 performs photoelectric conversion on the received fluorescence and finally analyzes whether it is an oil spill point. The emitted light path 141, after being reflected by two folding mirrors 1411, coincides with the received light path 142. Let the end of the sensor carrier 16 where the emitted light path 141 is located be the front and the opposite end be the back. The front of the sensor carrier 16 is provided with a hatch. The emitted light path 141 is emitted from the light port of the Cassegrain detection system 14 and then emitted through the hatch.

[0033] See appendix Figure 2 The equipment used in this adjustment method includes: a multispectral oil spill photoelectric sensor 1, a large-aperture collimator 2, an autocollimating theodolite 5, a collimating 780nm light source 3, and a flat crystal 4; wherein, the aperture of the large-aperture collimator 2 is much smaller than the aperture of the sensor carrier 16, and the aperture of the large-aperture collimator 2 is slightly larger than the aperture of the Cassegrain detection system 14 of the multispectral oil spill photoelectric sensor 1;

[0034] Step 1: Align the autocollimating theodolite 5 with the large-aperture collimator 2; place the multispectral oil spill photoelectric sensor 1 between the large-aperture collimator 2 and the autocollimating theodolite 5, and align the Cassegrain detection system 14 with the large-aperture collimator 2; and attach the flat crystal 4 to the reference surface (i.e., the back side) of the multispectral oil spill photoelectric sensor 1.

[0035] The placement position and height of the autocollimating theodolite 5 are related to the placement position of the multispectral oil spill photoelectric sensor 1 and the installation position of the flat crystal 4. When placing the autocollimating theodolite 5, the orientation of the multispectral oil spill photoelectric sensor 1 can be rotated to align the large-aperture collimating tube 2 and the autocollimating theodolite 5, and the autocollimating theodolite 5 can also be aligned with the flat crystal 4.

[0036] Step 2: Adjust the azimuth and pitch angles of the sensor carrier 16 so that the autocollimating theodolite 5 sees its own crosshairs and the crosshairs reflected by the flat crystal 4 coinciding;

[0037] Step 3: Replace the high-power ultraviolet laser 143 in the Cassegrain detection system 14 with a collimated 780nm light source 3, adjust the angle of the folding mirror 1411 so that the light emitted by the collimated 780nm light source 3 is focused on the center of the target surface of the large-aperture collimator 2, and lock the angle of the folding mirror 1411; adjust the front and rear positions of the focusing mirror 1421 in the Cassegrain detection system 14 so that the fluorescence light returned by the large-aperture collimator 2 is focused on the center of the fluorescence sensor 144; wherein, using the collimated 780nm light source 3 to emit infrared light, visible infrared light is easier to adjust and is closer to the frequency-doubled fluorescence, which can make the focusing mirror position more accurate;

[0038] Step 4: Adjust the position of the multispectral oil spill photoelectric device 1 so that part of the optical path in the emitting optical path 141 and the optical path of the visible light imaging system 11 are both placed within the effective aperture of the large-aperture collimator 2 (since the aperture of the large-aperture collimator 2 is much smaller than the aperture of the sensor carrier 16, and the aperture of the large-aperture collimator 2 is slightly larger than the aperture of the Cassegrain detection system 14 of the multispectral oil spill photoelectric device 1, only part of the emitting optical path 141 can be placed within the effective aperture of the large-aperture collimator 2).

[0039] Step 5: Adjust the azimuth and elevation angles of the sensor carrier 16 so that the light from the collimated 780nm light source 3 passes through the emission optical path 141 and is converged at the center of its target surface by the large-aperture collimator 2. Adjust the azimuth and elevation angles of the visible light imaging system 11 relative to the sensor carrier 16 so that it sees the crosshair image of the large-aperture collimator 2 coincide with its own crosshairs, thereby adjusting the optical axis of the visible light imaging system 11 so that the optical axis of the visible light imaging system 11 is parallel to the optical axis of the emission optical path 141.

[0040] Step 6: Adjust the position of the multispectral oil spill photoelectric sensor 1 and the azimuth and elevation angles of the sensor carrier 16 so that the optical paths of the visible light imaging system 11 and the mid-wave infrared imaging system 12 are both placed within the effective aperture of the large-aperture collimator 2. Adjust the azimuth and elevation angles of the visible light imaging system 11 relative to the sensor carrier 16 so that when the crosshairs of the visible light imaging system 11 are aligned with the crosshairs of the large-aperture collimator 2, the crosshairs of the mid-wave infrared imaging system 12 are aligned with the crosshairs of the large-aperture collimator 2, thereby adjusting the optical axis of the mid-wave infrared imaging system 12 so that the optical axis of the mid-wave infrared imaging system 12 is parallel to the optical axis of the visible light imaging system 11.

[0041] Step 7: Adjust the position of the multispectral oil spill photoelectric sensor 1 so that the optical paths of the mid-wave infrared imaging system 12 and the laser rangefinder 13 are both placed within the effective aperture of the large-aperture collimator 2. Adjust the azimuth and elevation angles of the laser rangefinder 13 relative to the sensor carrier 16 so that the laser emission point of the laser rangefinder 13 is focused on the target surface of the large-aperture collimator 2 and at the center of the crosshairs of the mid-wave infrared imaging system 12. This adjusts the optical axis of the laser rangefinder 13 so that the optical axis of the laser rangefinder 13 is parallel to the optical axis of the mid-wave infrared imaging system 12.

[0042] This completes the optical axis adjustment of the multispectral oil spill photoelectric sensor 1, enabling subsequent imaging and detection of oil spill points on the sea surface.

[0043] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for adjusting the optical axis of an ultra-large caliber shipborne multispectral oil spill photoelectric system, characterized in that, The equipment used in this adjustment method includes: a multispectral oil spill photoelectric device, a large-aperture collimator, an autocollimating theodolite, a collimating 780nm light source, and a flat crystal; wherein, the aperture of the large-aperture collimator is smaller than the aperture of the sensor carrier compartment of the multispectral oil spill photoelectric device. The adjustment method is as follows: First, align the autocollimating theodolite with the large-aperture collimator; place the multispectral oil spill photoelectric sensor between the large-aperture collimator and the autocollimating theodolite, and align the Cassegrain detection system of the multispectral oil spill photoelectric sensor with the large-aperture collimator; and attach a flat crystal to the reference surface of the multispectral oil spill photoelectric sensor. Then, the high-power ultraviolet laser in the Cassegrain detection system was replaced with a collimated 780nm light source, and the light emitted by the collimated 780nm light source was focused onto the center of the target surface of the large-aperture collimator, and the fluorescent light returning through the large-aperture collimator was focused onto the center of the fluorescence sensor. The Cassegrain detection system includes: an emitting optical path, a receiving optical path, a high-power ultraviolet laser, and a fluorescence sensor; the emitting optical path is equipped with two folding mirrors, and the receiving optical path is equipped with a focusing mirror; the emitting optical path reflects the frequency-doubled near-infrared light emitted by the high-power ultraviolet laser through the two folding mirrors and then collimates it to the target to be detected; the receiving optical path focuses the fluorescence generated by the excitation of the target oil spill site through the focusing mirror and converges it onto the fluorescence sensor; the fluorescence sensor performs photoelectric conversion on the received fluorescence and finally analyzes whether it is an oil spill point; After replacing the high-power ultraviolet laser with a collimated 780nm light source, the method to focus the light emitted by the collimated 780nm light source onto the center of the target surface of the large-aperture collimator is to adjust the angle of the folding mirror; the method to focus the fluorescent light returning from the large-aperture collimator onto the center of the fluorescence sensor is to adjust the front and rear positions of the focusing mirror. Finally, by adjusting the position of the multispectral oil spill photoelectric sensor and the azimuth and elevation angles of the sensor carrier, the optical axis of the visible light imaging system is made parallel to the optical axis of the emitted light path, the optical axis of the mid-wave infrared imaging system is made parallel to the optical axis of the visible light imaging system, and the optical axis of the laser rangefinder is made parallel to the optical axis of the mid-wave infrared imaging system, thereby achieving the adjustment of the optical axis of the multispectral oil spill photoelectric sensor.

2. The method for adjusting the optical axis of an ultra-large caliber shipborne multispectral oil spill photoelectric system as described in claim 1, characterized in that, After attaching a flat crystal to the reference surface of the multispectral oil spill photoelectric sensor, and before replacing the high-power ultraviolet laser in the Cassegrain detection system with a collimated 780nm light source, adjust the azimuth and pitch angles of the sensor carrier to make the autocollimating theodolite see its own crosshairs and the crosshairs reflected by the flat crystal coincide.

3. The method for adjusting the optical axis of an ultra-large caliber shipborne multispectral oil spill photoelectric system as described in claim 2, characterized in that, The specific steps for ensuring that the optical axis of the visible light imaging system is parallel to the optical axis of the emitted light path, the optical axis of the mid-wave infrared imaging system is parallel to the optical axis of the visible light imaging system, and the optical axis of the laser rangefinder is parallel to the optical axis of the mid-wave infrared imaging system are as follows: Step 1: Adjust the position of the multispectral oil spill photoelectric device so that part of the light path in the emission light path and the light path of the visible light imaging system are both placed within the effective aperture of the large-aperture collimator; Step 2: Adjust the azimuth and elevation angles of the sensor carrier to ensure that the light from the collimated 780nm light source is focused on the center of the target surface by the large-aperture collimator after passing through the emission optical path. Adjust the azimuth and elevation angles of the visible light imaging system relative to the sensor carrier so that the crosshair image of the large-aperture collimator coincides with its own crosshairs, thereby adjusting the optical axis of the visible light imaging system so that the optical axis of the visible light imaging system is parallel to the optical axis of the emission optical path. Step 3: Adjust the position of the multispectral oil spill photoelectric sensor and the azimuth and elevation angles of the sensor carrier to ensure that the optical paths of the visible light imaging system and the mid-wave infrared imaging system are both within the effective aperture of the large-aperture collimator. Adjust the azimuth and elevation angles of the visible light imaging system relative to the sensor carrier so that when the crosshairs of the visible light imaging system are aligned with the crosshairs of the large-aperture collimator, the crosshairs of the mid-wave infrared imaging system are also aligned with the crosshairs of the large-aperture collimator. This achieves the adjustment of the optical axis of the mid-wave infrared imaging system, making the optical axis of the mid-wave infrared imaging system parallel to the optical axis of the visible light imaging system. Step 4: Adjust the position of the multispectral oil spill photoelectric sensor so that the optical paths of the mid-wave infrared imaging system and the laser rangefinder are both placed within the effective diameter of the large-aperture collimator. Adjust the azimuth and elevation angles of the laser rangefinder relative to the sensor carrier to make the laser emission point of the laser rangefinder converge on the target surface of the large-aperture collimator and at the center of the crosshairs of the mid-wave infrared imaging system. This will adjust the optical axis of the laser rangefinder so that its optical axis is parallel to that of the mid-wave infrared imaging system.

4. A method for adjusting the optical axis of an ultra-large caliber shipborne multispectral oil spill photoelectric system as described in any one of claims 1-3, characterized in that, The placement and height of the autocollimating theodolite are related to the placement of the multispectral oil spill photoelectric sensor and the installation position of the flat crystal. When placing the autocollimating theodolite, the orientation of the multispectral oil spill photoelectric sensor can be rotated to align the large-aperture collimating tube and the autocollimating theodolite, and the autocollimating theodolite can also be aligned with the flat crystal.

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