Athermalization optical system with common caliber of infrared light and visible light

Abstract

The utility model relates to the field of optical systems, and discloses an infrared and visible light common caliber athermalization optical system, which comprises a receiving module and a light splitting module, the receiving module comprises two primary reflectors, two secondary reflectors and a refraction lens, the secondary reflectors and the refraction lens are sequentially and coaxially arranged along the light incidence direction, and the secondary reflectors are coaxially arranged along the light incidence direction. The two main reflectors are both arranged between the secondary reflector and the refraction lens and are symmetrically arranged relative to the connecting line of the center of the secondary reflector and the center of the refraction lens, and the light splitting module comprises a light splitting piece, a first light path adjusting module and a second light path adjusting module; the beam splitter is used for transmitting infrared light in the incident light output by the refraction lens into the first light path adjusting module and reflecting visible light in the incident light output by the refraction lens into the second light path adjusting module. According to the utility model, long-distance imaging in complex environments such as sea fog and the like can be realized, the thermal stability is still realized in a working environment with variable temperature, and the imaging quality is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical system technical field, concretely relates to infrared and visible light common caliber athermalization optical system. BACKGROUND

[0002] Optical system can realize the imaging and identification of long-distance target, and has been widely applied to the imaging and detection in various practical complex environments.

[0003] When imaging in special environment, for example, at sea, the sea fog forms fast, lasts long and diffuses strongly, which can cause the problem of sudden decrease of visibility and easily lead to frequent accidents, thus causing huge economic losses. Therefore, there is an urgent need to realize long-distance imaging in the environment with low visibility such as sea fog. In addition, the optical devices in the optical system are affected by the change of external environment temperature, and there is an image plane drift, so it is necessary to perform athermalization treatment on the optical system.

[0004] At present, there is lack of high-precision imaging scheme in the environment with low visibility such as sea fog in the prior art. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the utility model provides an infrared and visible light common caliber athermalization optical system, which can overcome the technical problem that there is lack of high-precision imaging scheme in the environment with low visibility such as sea fog in the prior art.

[0006] The utility model provides a infrared and visible light common caliber athermalization optical system, include: receiving module, including main reflector, secondary reflector and refracting lens, secondary reflector and refracting lens are coaxial along the light incident direction in turn, main reflector is equipped with two, two main reflectors are all set between secondary reflector and refracting lens and set up symmetrically with respect to the line of secondary reflector center and refracting lens center, main reflector is used for reflecting the incident light to secondary reflector, secondary reflector is used for reflecting the incident light of main reflector reflection to refracting lens, refracting lens is used for transmitting the incident light of secondary reflector reflection to light splitting module;Light splitting module, including light splitting sheet, first optical path adjusting module and second optical path adjusting module, light splitting sheet is used for transmitting the infrared light of refracting lens output's incident light into first optical path adjusting module, and the visible light of refracting lens output's incident light is reflected into second optical path adjusting module, or, light splitting sheet is used for reflecting the infrared light of refracting lens output's incident light into first optical path adjusting module, and the visible light of refracting lens output's incident light is transmitted into second optical path adjusting module, first optical path adjusting module is used for imaging adjustment to the incident infrared light, and second optical path adjusting module is used for imaging adjustment to the incident visible light.

[0007] Optionally, the front surface of the primary mirror has a radius of curvature of -1470.118mm and an asphericity coefficient of -0.982, the front surface of the secondary mirror has a radius of curvature of -774.148mm and an asphericity coefficient of -5.524, the front surface of the refractive lens has a radius of curvature of -313.392mm, and the rear surface of the refractive lens has a radius of curvature of 223.987mm, and the refractive lens is a spherical lens.

[0008] Optionally, the axial distance between the front surface of the secondary mirror and the front surface of the primary mirror is 512.977mm, and the axial distance between the rear surface of the primary mirror and the front surface of the refractive lens is 5.096mm.

[0009] Optionally, the refractive lens is made of H-ZK3 glass material.

[0010] Optionally, the primary mirror and the secondary mirror are both made of microcrystalline glass lens.

[0011] Optionally, the receiving module further comprises an optical barrel, and the primary mirror, the secondary mirror and the refractive lens are all arranged in the optical barrel.

[0012] Optionally, the light splitting module further comprises a diaphragm and a collimating lens arranged in sequence between the refractive lens and the light splitting sheet.

[0013] Optionally, the first light path adjusting module comprises a narrow-band filter and a first focusing lens arranged in sequence along the direction of the infrared light emission, the narrow-band filter is used for filtering light other than the target waveband, and the first focusing lens is used for focusing and shaping the light of the target waveband output by the narrow-band filter.

[0014] Optionally, the central wavelength of the narrow-band filter is 1550nm.

[0015] Optionally, the second light path adjusting module comprises a high-reflectivity mirror and a second focusing lens, the light splitting sheet and the high-reflectivity mirror are both arranged at an inclination of 45°, the high-reflectivity mirror is used for reflecting visible light to the second focusing lens, and the second focusing lens is used for focusing and shaping the visible light reflected by the high-reflectivity mirror.

[0016] The utility model has the following effects:

[0017] The infrared and visible light common-caliber athermalization optical system of the utility model mainly comprises a main reflector, a secondary reflector and a refractive lens to form an R-C reflective optical system, thereby receiving incident light rays, wherein the main reflector and the secondary reflector bear most of the optical power, which is conducive to athermalization design of the system, and the addition of the refractive lens on the basis of the main reflector and the secondary reflector completes athermalization processing of the optical system, so that the optical system has thermal stability, and ensures stable imaging of the optical system in a complex environment with varying temperatures; meanwhile, the incident light rays are divided into visible light and infrared light by means of a light splitting sheet, a first light path adjusting module and a second light path adjusting module, and the visible light and the infrared light are respectively subjected to imaging adjustment, so that the visible light and the infrared light are respectively imaged, the transmission loss of the infrared light is low, and the optical system is suitable for imaging environments with low visibility such as sea fog, so that the utility model can realize long-distance imaging in a complex environment such as sea fog, has thermal stability in a working environment with varying temperatures, has good imaging quality, and has a simple optical system structure and is easy to assemble and adjust. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0019] Figure 1 It is a structural schematic view of the infrared and visible light common-caliber athermalization optical system of the embodiment of the utility model;

[0020] Figure 2 It is a structural schematic view of the receiving module of the embodiment of the utility model;

[0021] Figure 3 It is a structural schematic view of the light splitting module of the embodiment of the utility model;

[0022] Figure 4 It is a simulation design schematic view of the R-C reflective optical system of the embodiment of the utility model;

[0023] Figure 5 It is an optical transfer function curve schematic view of the R-C reflective optical system of the embodiment of the utility model when the working environment temperature is-20 DEG C;

[0024] Figure 6 It is an optical transfer function curve schematic view of the R-C reflective optical system of the embodiment of the utility model when the working environment temperature is 20 DEG C;

[0025] Figure 7The utility model discloses an R-C reflection type optical system's optical transfer function curve schematic diagram when the working environment temperature is 60 DEG C.

[0026] Mark explanation:

[0027] 1 - main mirror, 2 - secondary mirror, 3 - refractive lens, 4 - diaphragm, 5 - collimating lens, 6 - light splitting piece, 7 - narrow band filter, 8 - first focusing lens, 9 - high reflection mirror, 10 - second focusing lens. Specific implementation

[0028] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, and obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.

[0029] In the description of the utility model, it is necessary to explain that the term "several" represents one or more. In addition, the terms "first", "second", "third" and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0031] Optical system can realize the imaging and identification of long distance target, and has been widely used in the imaging and detection in various practical complex environment. In various optical system structures, R-C reflection type optical system needs less optical element, and the reflectivity is higher, and there is no chromatic aberration, and can be applied to various large field of view actual imaging scene. In order to meet the imaging demand under different illumination conditions, the visible light and infrared are combined to realize the ideal imaging under different imaging illumination conditions. Especially, the transmission loss of 1550nm band infrared light is lower, and it is suitable for the imaging environment with low visibility such as sea fog.

[0032] In addition, it should be noted that each optical element in the optical system is obviously affected by the external temperature, thereby affecting the final actual imaging effect of the optical system. Therefore, in order to avoid the influence of the temperature change of the working environment on the actual imaging effect of the optical system, the optical system needs to be athermalized. The athermalization method of the optical system includes optical passive athermalization, mechanical electronic (active) athermalization and mechanical passive athermalization. Compared with the other two athermalization methods, the optical passive athermalization does not need to introduce additional electronic moving elements, has high reliability, does not need additional power supply, and can realize compact and light optical system design with a simple structure. In order to meet the adaptation requirements of the optical system to different working environment temperatures, most of the optical systems on the market currently adopt mechanical focusing means, which has the defects of complex overall structure of the optical system, large design difficulty and high cost.

[0033] Therefore, the utility model provides an infrared and visible light common-caliber athermalization optical system, which has optical system thermal stability and can realize ideal actual environment imaging in the visible light and infrared wave bands in the temperature range of-20 DEG C to 60 DEG C.

[0034] Please refer to Figure 1 、 Figure 2 and Figure 3 , the utility model embodiment's a infrared and visible light common-caliber athermalization optical system, comprising:

[0035] The receiving module comprises a primary mirror 1, a secondary mirror 2 and a refractive lens 3. The secondary mirror 2 and the refractive lens 3 are coaxially arranged along the light incident direction in sequence. The primary mirror 1 is provided with two primary mirrors 1. Both of the two primary mirrors 1 are arranged between the secondary mirror 2 and the refractive lens 3 and are symmetrically arranged with respect to the line connecting the center of the secondary mirror 2 and the center of the refractive lens 3. The primary mirror 1 is used for reflecting the incident light to the secondary mirror 2. The secondary mirror 2 is used for reflecting the incident light reflected by the primary mirror 1 to the refractive lens 3. The refractive lens 3 is used for transmitting the incident light reflected by the secondary mirror 2 to the light splitting module.

[0036] Specifically, the receiving module further comprises an optical lens barrel. The primary mirror 1, the secondary mirror 2 and the refractive lens 3 are all arranged in the optical lens barrel.

[0037] The primary mirror 1, the secondary mirror 2 and the refractive lens 3 are arranged along the light path direction and constitute an R-C reflective optical system, thereby receiving the incident light.

[0038] In one example, the primary reflector 1 has a radius of curvature of -1470.118 mm, an aperture of 100.007 mm, and a surface shape parameter of -0.982; the secondary reflector 2 has a radius of curvature of -774.148 mm, an aperture of 31.334 mm, and a surface shape parameter of -5.524; the refractive lens 3 is a spherical lens with a radius of curvature of -313.392 mm, an aperture of 0.607 mm, and a surface shape parameter of 0.607. The optical barrel is made of aluminum alloy with a low expansion system. The total length of the RC reflection optical system is 557.52633 mm, and the actual focal length is 1849.51 mm. The light enters the optical barrel and reaches the primary reflector 1. After being reflected by the primary reflector 1, the light reaches the secondary reflector 2. After being reflected by the secondary reflector 2, the light reaches the spherical refractive lens 3 and exits after passing through the refractive lens 3.

[0039] The beam splitter module includes a beam splitter 6, a first optical path adjustment module, and a second optical path adjustment module. The beam splitter 6 is used to transmit infrared light from the incident light output by the refracting lens 3 into the first optical path adjustment module and reflect visible light from the incident light output by the refracting lens 3 into the second optical path adjustment module. Alternatively, the beam splitter 6 is used to reflect infrared light from the incident light output by the refracting lens 3 into the first optical path adjustment module and transmit visible light from the incident light output by the refracting lens 3 into the second optical path adjustment module. The first optical path adjustment module is used to perform imaging adjustment on the incident infrared light, and the second optical path adjustment module is used to perform imaging adjustment on the incident visible light.

[0040] Specifically, the beam splitter 6 is a wedge-shaped infrared beam splitter 6 with high transmittance in the infrared band. The wedge angle and the back of the wedge-shaped infrared beam splitter 6 are coated with an infrared light anti-reflection film, which can reduce the ghost image interference reflected from the back surface.

[0041] For example, the surface of beam splitter 6 is coated with a 700nm-1900nm infrared antireflection film, allowing infrared light to pass through. The surface of beam splitter 6 is also coated with a 300nm-700nm visible light high reflectivity film, which reflects visible light in the 300nm-700nm band, thus achieving the purpose of beam splitting. Alternatively, the surface of beam splitter 6 can be coated with a 700nm-1900nm infrared high reflectivity film to reflect infrared light, and the surface of beam splitter 6 can also be coated with a 300nm-700nm visible light antireflection film, allowing visible light in the 300nm-700nm band to pass through, thus achieving the purpose of beam splitting.

[0042] In one example, such as Figure 3 As shown, with the direction of light incidence as the horizontal direction, the beam splitter 6 is tilted at 45° relative to the direction of light incidence, so that infrared light is horizontally emitted after horizontal transmission through the beam splitter 6, and visible light is vertically emitted after reflection through the beam splitter 6, thus achieving beam splitting.

[0043] The first light path adjusting module and the second light path adjusting module are mainly used for focusing and shaping the infrared light and the visible light to meet the imaging requirement.

[0044] The infrared and visible light common aperture athermalization optical system mainly comprises a main mirror 1, a secondary mirror 2 and a refractive lens 3, thereby receiving the incident light, wherein the main mirror 1 and the secondary mirror 2 bear most of the optical power, which is beneficial to the athermalization design of the system, the refractive lens 3 is added on the basis of the main mirror 1 and the secondary mirror 2 to complete the athermalization processing of the optical system, so that the optical system has thermal stability, and stable imaging of the optical system can be ensured in a complex environment with variable temperature, meanwhile, the incident light is divided into visible light and infrared light by the light splitting sheet 6, the first light path adjusting module and the second light path adjusting module, and the visible light and the infrared light are respectively imaged and adjusted, so that the visible light and the infrared light are respectively imaged, the transmission loss of the infrared light is low, and the infrared light is suitable for an imaging environment with low visibility such as sea fog, therefore, the utility model can realize long-distance imaging in a complex environment such as sea fog, has thermal stability in a working environment with variable temperature, has good imaging quality, and the optical system has simple structure and is easy to assemble and adjust.

[0045] In some embodiments, the curvature radius of the front surface of the main mirror 1 is-1470.118mm, the asphericity coefficient is-0.982, the curvature radius of the front surface of the secondary mirror 2 is-774.148mm, the asphericity coefficient is-5.524, the curvature radius of the front surface of the refractive lens 3 is-313.392mm, the curvature radius of the rear surface of the refractive lens 3 is 223.987mm, and the refractive lens 3 is a spherical lens.

[0046] The axial distance between the front surface of the secondary mirror 2 and the front surface of the main mirror 1 is 512.977mm, and the axial distance between the rear surface of the main mirror 1 and the front surface of the refractive lens 3 is 5.096mm.

[0047] The refractive lens 3 adopts H-ZK3 glass material lens.

[0048] The main mirror 1 and the secondary mirror 2 both adopt microcrystalline glass lens.

[0049] Specifically, the main mirror 1 is an aspheric lens, the aperture is 100.007mm, the secondary mirror 2 is an aspheric lens, the aperture is 31.334mm, the refractive lens 3 is a spherical lens, the aperture is 0.607mm, and the face shape parameter is 0.607. All the optical elements of the receiving module are distributed on the same optical axis.

[0050] The optical barrel is made of aluminum alloy material with low expansion coefficient. The total length of the R-C reflective optical system is 557.52633 mm, the actual focal length is 1849.51 mm, the light path enters the optical system to reach the primary mirror 1, after being reflected by the primary mirror 1, the light path reaches the secondary mirror 2, after being reflected by the secondary mirror 2, the light path reaches the spherical refractive lens 3, and after passing through the spherical refractive lens 3, the light path exits.

[0051] Among them, the primary mirror 1 and the secondary mirror 2 are both made of microcrystalline glass as optical material, and the spherical refractive lens 3 is made of H-ZK3 glass as optical material.

[0052] The primary mirror 1 and the secondary mirror 2 are both made of microcrystalline glass as optical material, and the material is the same, so the expansion coefficient at different temperatures is the same, which is conducive to the thermal design of the system.

[0053] The H-ZK3 glass material is used as the material of the refractive lens 3 of the R-C reflective optical system. According to the glass manual provided by the manufacturer, this type of glass has excellent thermal properties, high softening temperature, is suitable for various extreme imaging environments, has high glass transmittance and low optical power loss, is suitable for long-distance imaging environment, and in addition, this type of glass has sufficient stock and low price, which is more suitable for the actual production and application of optical systems.

[0054] In an example, the optical surface curvature radius, asphericity coefficient, material of each optical element, distribution distance of each optical element surface along the optical axis, and optical barrel material of the primary mirror 1, the secondary mirror 2, and the refractive lens 3 are shown in Table 1.

[0055] Table 1 Optical element parameter table

[0056]

[0057] It should be understood that the above-mentioned "front surface" and "rear surface" are both relative to the light path direction, and the surface before the light path direction is the "front surface".

[0058] Specifically, the R-C reflective optical system of the receiving module is simulated by the optical simulation software Zemax, the simulation design is as shown in Figure 4 , the optical transfer function curve diagram obtained by simulation when the working environment temperature is-20℃ is as shown in Figure 5 , the optical transfer function curve diagram when the working environment temperature is 20℃ is as shown in Figure 6 , the optical transfer function curve diagram when the working environment temperature is 60℃ is as shown in Figure 7 , according to Figure 5 , Figure 6 and Figure 7It is shown that the cut-off frequency of the R-C reflective optical system of the receiving module is stabilized at 224Hz under different working temperature environments, and the optical transfer function curves of the optical system under three working temperature environments do not change obviously, indicating that the R-C reflective optical system is less affected by the external working environment and has high thermal stability.

[0059] In some embodiments, the light splitting module further comprises a diaphragm 4 and a collimating lens 5 arranged in sequence between the refractive lens 3 and the light splitting sheet 6.

[0060] Specifically, the parameters of the collimating lens 5 are designed as follows:

[0061] The front vertex curvature radius of the collimating lens 5 is 34.3109mm, the rear vertex curvature radius is 91.3292mm, the thickness is 10mm, the aperture is 50mm, the focal length is 100mm, and the second surface shape parameter is -0.43367.

[0062] The light rays emitted through the refractive lens 3 can eliminate stray light through the diaphragm 4, and then are collimated through the collimating lens 5 to become parallel light output to the light splitting sheet 6.

[0063] Further, the first light path adjusting module comprises a narrow-band filter 7 and a first focusing lens 8 arranged in sequence along the infrared light emission direction, the narrow-band filter 7 is used for filtering light rays except for the target waveband, and the first focusing lens 8 is used for focusing and shaping the light rays of the target waveband output through the narrow-band filter 7.

[0064] Specifically, the second light path adjusting module comprises a high-reflectivity mirror 9 and a second focusing lens 10, the light splitting sheet 6 and the high-reflectivity mirror 9 are both arranged at an inclination of 45°, the high-reflectivity mirror 9 is used for reflecting visible light to the second focusing lens 10, and the second focusing lens 10 is used for focusing and shaping the visible light reflected by the high-reflectivity mirror 9.

[0065] For example, the light splitting sheet 6 is placed at an inclination of 45° with the horizontal light path to split the infrared light and the visible light.

[0066] After the visible light passes through the light splitting sheet 6, the light path becomes vertical, then passes through the high-reflectivity mirror 9, the high-reflectivity mirror 9 is placed at an inclination of 45° with the horizontal light path, so that the visible light is horizontally emitted, and then the second focusing lens 10 is used for focusing and shaping the visible light.

[0067] The center wavelength of the narrow-band filter 7 is 1550nm, i.e. the target waveband is 1550nm. The infrared light of the 1550nm waveband has low transmission loss and is suitable for imaging environments with low visibility such as sea fog, so that the imaging precision can be improved.

[0068] In the infrared light path, the narrow-band filter 7 coated with narrow-band 1550nm high-transmission film on the front and back surfaces filters the near-infrared waveband, and outputs the infrared light signal of the 1550nm waveband, and then the first focusing lens 8 focuses and shapes the light of the 1550nm waveband.

[0069] The infrared and visible light common-aperture athermal optical system can realize ideal imaging effect of receiving visible light and 1550nm infrared waveband double channels in a common-aperture mode in a temperature range of-20 DEG C to 60 DEG C, and has good imaging quality in a wide temperature range.

[0070] The infrared and visible light common-aperture athermal optical system is suitable for long-distance, high-precision, long-distance high-resolution complex environment imaging in a changeable working environment temperature.

[0071] The infrared and visible light common-aperture athermal optical system is suitable for long-distance, high-precision, long-distance high-resolution complex environment imaging in a changeable working environment temperature.

[0072] Although the embodiments of the present application have been described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. An infrared and visible light co-boreshed athermalized optical system, characterized by, The application relates to a receiving module for a thermal infrared and visible light imaging system. The receiving module comprises a main reflector (1), a secondary reflector (2) and a refractive lens (3), the secondary reflector (2) and the refractive lens (3) are coaxially arranged along the light incidence direction in sequence, the main reflector (1) is provided with two, the two main reflectors (1) are arranged between the secondary reflector (2) and the refractive lens (3) and are symmetrically arranged relative to the connecting line of the center of the secondary reflector (2) and the center of the refractive lens (3), the main reflector (1) is used for reflecting incident light to the secondary reflector (2), the secondary reflector (2) is used for reflecting the incident light reflected by the main reflector (1) to the refractive lens (3), and the refractive lens (3) is used for transmitting the incident light reflected by the secondary reflector (2) to a light splitting module. The light splitting module comprises a light splitting sheet (6), a first light path adjusting module and a second light path adjusting module, the light splitting sheet (6) is used for transmitting infrared light in the incident light output by the refractive lens (3) into the first light path adjusting module and reflecting visible light in the incident light output by the refractive lens (3) into the second light path adjusting module, or the light splitting sheet (6) is used for reflecting infrared light in the incident light output by the refractive lens (3) into the first light path adjusting module and transmitting visible light in the incident light output by the refractive lens (3) into the second light path adjusting module, the first light path adjusting module is used for imaging adjustment of the incident infrared light, and the second light path adjusting module is used for imaging adjustment of the incident visible light.

2. The infrared and visible light co-axial athermalized optical system according to claim 1, characterized in that, The curvature radius of the front surface of the main reflector (1) is -1470.118 mm, the asphericity coefficient is -0.982, the curvature radius of the front surface of the secondary reflector (2) is -774.148 mm, the asphericity coefficient is -5.524, the curvature radius of the front surface of the refractive lens (3) is -313.392 mm, the curvature radius of the rear surface of the refractive lens (3) is 223.987 mm, and the refractive lens (3) is a spherical lens.

3. The infrared and visible light co-axial athermalized optical system according to claim 1, wherein, The axial distance between the front surface of the secondary reflector (2) and the front surface of the main reflector (1) is 512.977 mm, and the axial distance between the rear surface of the main reflector (1) and the front surface of the refractive lens (3) is 5.096 mm.

4. The infrared and visible light co-axial athermalized optical system according to claim 1, wherein, The refractive lens (3) adopts H-ZK3 glass material lens.

5. The infrared and visible light co-axial athermalized optical system according to claim 1, wherein, The main reflector (1) and the secondary reflector (2) both adopt microcrystalline glass lens.

6. The infrared and visible light co-axial athermalized optical system according to claim 1, wherein, The receiving module further comprises an optical lens barrel, and the main reflector (1), the secondary reflector (2) and the refractive lens (3) are arranged in the optical lens barrel.

7. The infrared and visible light co-axial athermalized optical system according to claim 1, wherein, The light splitting module further comprises a diaphragm (4) and a collimating lens (5) arranged in sequence between the refractive lens (3) and the light splitting sheet (6).

8. The infrared and visible light co-axial athermalized optical system according to claim 1, wherein, The first light path adjusting module comprises a narrow-band filter (7) and a first focusing lens (8) arranged in sequence along the infrared light emission direction, the narrow-band filter (7) is used for filtering light rays except for the target wave band, and the first focusing lens (8) is used for focusing and shaping the light rays of the target wave band output by the narrow-band filter (7).

9. The infrared and visible light co-axial athermalized optical system according to claim 8, wherein, The center wavelength of the narrow-band filter (7) is 1550 nm.

10. The infrared and visible light co-axial athermalized optical system according to claim 1, wherein, The second light path adjusting module comprises a high-reflection mirror (9) and a second focusing lens (10), the beam splitter (6) and the high-reflection mirror (9) are both arranged at an inclination of 45°, the high-reflection mirror (9) is used for reflecting visible light to the second focusing lens (10), and the second focusing lens (10) is used for focusing and shaping the visible light reflected by the high-reflection mirror (9).

Images