Long working distance visible light target detection optical system
By designing a long-working-distance visible light target detection optical system with seven spherical glass lenses, the problems of short working distance and low accuracy of existing systems have been solved, realizing high-precision target detection in harsh environments, and applicable to military, security and aerospace fields.
Patent Information
- Application Number
- CN202423237664.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing visible light target detection optical systems have limited performance in practical applications due to their short working distance, low detection accuracy, and poor environmental adaptability.
A long-working-distance visible light target detection optical system was designed, which uses seven spherical glass lenses, including the first lens to the detector target surface, to meet specific optical parameters and material requirements, achieve clear imaging and accurate detection of targets from 60m to 50km, and adopts high and low temperature resistant and radiation-proof materials to adapt to harsh environments.
It achieves clear imaging and accurate detection of targets from 60m to 50km in a full field of view of 28°. The system has a compact structure, low cost, light weight, adaptability to various harsh environments, and is suitable for mass production applications.
Smart Images
Figure CN223611779U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical detection technical field, concretely relates to a long work distance visible light target detection optical system, and this system can carry out visible light target detection under long work distance. BACKGROUND
[0002] With the development of science and technology, optical detection technology plays more and more important role in military, security, aerospace and other fields. The existing visible light target detection optical system usually has the problems of short working distance, low detection precision, poor environmental adaptability, etc., which limits its performance in practical application. Therefore, it has important practical significance to study a long working distance, high precision, strong environmental adaptability visible light target detection optical system. SUMMARY
[0003] The utility model discloses to solve the problems of short working distance, low detection precision, poor environmental adaptability, etc. of the existing optical system, which limits its performance in practical application, and provides a long working distance visible light target detection optical system to realize clear imaging and accurate detection of the target with a working distance of 60m to 50km.
[0004] A long working distance visible light target detection optical system comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a detector protection glass and a detector target surface arranged in sequence along the direction of incident light propagation.
[0005] The incident light beam is sequentially imaged on the detector target surface after passing through the first lens, the second lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the detector protection glass.
[0006] The first lens is a positive lens with a focal length of 65 to 75mm; the second lens is a positive lens with a focal length of 45 to 55mm; the third lens is a negative lens with a focal length of -23 to -13mm; the fourth lens is a positive lens with a focal length of 16 to 26mm; the fifth lens is a positive lens with a focal length of 150 to 160mm; the sixth lens is a positive lens with a focal length of 52 to 62mm; the seventh lens is a negative lens with a focal length of -25 to -15mm; and the image element size of the detector target surface is 5.5μm.
[0007] Further, the first lens has a center thickness of 2.9 to 4.9mm; the second lens has a center thickness of 2.6 to 4.6mm; the third lens has a center thickness of 2 to 4mm; the fourth lens has a center thickness of 3 to 5mm; the fifth lens has a center thickness of 2.8 to 4.8mm; the sixth lens has a center thickness of 2.2 to 4.2mm; and the seventh lens has a center thickness of 1.9 to 3.9mm.
[0008] Further, the interval between the first lens and the second lens is 0.3-0.8mm; the interval between the second lens and the third lens is 1.3-3.3mm; the interval between the third lens and the diaphragm is 2.8-4.8mm; the interval between the diaphragm and the fourth lens is 0.5-2.5mm; the interval between the fourth lens and the fifth lens is 1-3mm; the interval between the fifth lens and the sixth lens is 2-4mm; the interval between the sixth lens and the seventh lens is 1.8-3.8mm; the interval between the seventh lens and the detector protective glass is 2-6mm; and the interval between the detector protective glass and the detector target surface is 0.5-1.5mm.
[0009] Preferably, the first lens satisfies the relationship: N d ≥1.4, V d ≥67; the second lens satisfies the relationship: N d ≥1.5, V d ≥68; the third lens satisfies the relationship: N d ≥1.6, V d ≥33; the fourth lens satisfies the relationship: N d ≥1.5, V d ≥75; the fifth lens satisfies the relationship: N d ≥1.9, V d ≥20; the sixth lens satisfies the relationship: N d ≥1.6, V d ≥44; the seventh lens satisfies the relationship: N d ≥1.8, V d ≥25; and the detector protective glass satisfies the relationship: N d ≥1.5, V d ≥54; wherein N d is the refractive index, and V d is the Abbe constant.
[0010] Further, the imaging spectral range of the optical system is between 450nm and 850nm.
[0011] Further, the field of view angle of the optical system is 28°.
[0012] The beneficial effects of the present application are:
[0013] 1. The target clear imaging and accurate detection of 60m-50km working distance are realized under the full field of view of 28°.
[0014] 2. The present application adopts high and low temperature resistant and anti-radiation materials to ensure that the optical system can work stably in various harsh environments.
[0015] 3. The large field of view target detection function is realized by using seven spherical glass lenses, low cost, compact structure, small volume, light weight, low production and assembly difficulty, and is conducive to mass production application. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 A long working distance visible light target detection optical system structure schematic diagram is described in the utility model.
[0017] Figure 2 In the figure, (a) is the optical system modulation transfer function of the utility model at the working distance 60m; (b) is the optical system modulation transfer function at 50km.
[0018] Figure 3 In the figure, (a) is the optical system point diagram of the utility model at the working distance 60m; (b) is the optical system point diagram at 50km.
[0019] Figure 4 A long working distance visible light target detection optical system field area and distortion diagram is described in the utility model.
[0020] In the figure: 1, first lens, 2, second lens, 3, third lens, 4, diaphragm, 5, fourth lens, 6, fifth lens, 7, sixth lens, 8, seventh lens, 9, detector window protection glass, 10, detector target surface. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model.
[0022] Figure 1 A long working distance visible light target detection optical system structure schematic diagram is described in the utility model, and the first lens 1, the second lens 2, the third lens 3, the diaphragm 4, the fourth lens 5, the fifth lens 6, the sixth lens 7, the seventh lens 8, the detector protection glass 9 and the detector target surface 10 are coaxially arranged in turn along the direction of light propagation;
[0023] The incident light beam is imaged on the detector target surface 10 after passing through the first lens 1, the second lens 2, the third lens 3, the diaphragm 4, the fourth lens 5, the fifth lens 6, the sixth lens 7, the seventh lens 8 and the detector protection glass 9 in turn;
[0024] The first lens 1 is a positive lens with a focal length of 65-75 mm; the second lens 2 is a positive lens with a focal length of 45-55 mm; the third lens 3 is a negative lens with a focal length of -23--13 mm; the fourth lens 5 is a positive lens with a focal length of 16-26 mm; the fifth lens 6 is a positive lens with a focal length of 150-160 mm; the sixth lens 7 is a positive lens with a focal length of 52-62 mm; the seventh lens 8 is a negative lens with a focal length of -25--15 mm; and the image element size of the detector target surface 10 is 5.5 μm.
[0025] The central thickness of the first lens 1 is 2.9-4.9 mm; the central thickness of the second lens 2 is 2.6-4.6 mm; the central thickness of the third lens 3 is 2-4 mm; the central thickness of the fourth lens 5 is 3-5 mm; the central thickness of the fifth lens 6 is 2.8-4.8 mm; the central thickness of the sixth lens 7 is 2.2-4.2 mm; and the central thickness of the seventh lens 8 is 1.9-3.9 mm.
[0026] The distance between the first lens 1 and the second lens 2 is 0.3-0.8 mm; the distance between the second lens 2 and the third lens 3 is 1.3-3.3 mm; the distance between the third lens 3 and the diaphragm 4 is 2.8-4.8 mm; the distance between the diaphragm 4 and the fourth lens 5 is 0.5-2.5 mm; the distance between the fourth lens 5 and the fifth lens 6 is 1-3 mm; the distance between the fifth lens 6 and the sixth lens 7 is 2-4 mm; the distance between the sixth lens 7 and the seventh lens 8 is 1.8-3.8 mm; the distance between the seventh lens 8 and the detector protection glass 9 is 2-6 mm; and the distance between the detector protection glass 9 and the detector target surface 10 is 0.5-1.5 mm.
[0027] The first lens 1 satisfies the relationship: N d ≥ 1.4, V d ≥ 67; the second lens 2 satisfies the relationship: N d ≥ 1.5, V d ≥ 68; the third lens 3 satisfies the relationship: N d ≥ 1.6, V d ≥ 33; the fourth lens 5 satisfies the relationship: N d ≥ 1.5, V d ≥ 75; the fifth lens 6 satisfies the relationship: N d ≥ 1.9, V d ≥ 20; the sixth lens 7 satisfies the relationship: N d ≥ 1.6, V d ≥ 44; and the seventh lens 8 satisfies the relationship: N d ≥ 1.8, V d≥25; the detector protection glass 9 satisfies the relationship: N d ≥1.5, V d ≥54; wherein N d is the refractive index, and V d is the Abbe constant.
[0028] The imaging spectral range of the optical system is between 450 nm and 850 nm.
[0029] The parameters of each lens in the long working distance visible light target detection optical system of the embodiment can be specifically set according to actual imaging accuracy requirements, and the embodiment gives a set of preferred parameters that can achieve high imaging accuracy, but is not limited to the embodiment.
[0030] The long working distance visible light target detection optical system provided by the embodiment has a field of view angle of 28°.
[0031] Figure 2 The optical system modulation transfer function provided by the utility model, wherein the abscissa represents the spatial modulation frequency, and the ordinate represents the optical modulation function. Figure 2 In the figure, (a) is the optical system modulation transfer function when the working distance is 60 m, and the modulation transfer function of each field of view is better than 0.36 under the spatial modulation frequency of 91 lp / mm, (b) is the optical system modulation transfer function when the working distance is 50 km, and the modulation transfer function of each field of view is better than 0.35 under the spatial modulation frequency of 91 lp / mm, and the resolution capability of the optical system is stronger.
[0032] Figure 3 The point spread diagram of the optical system provided by the utility model. Figure 3 In the figure, (a) is the optical system point spread diagram when the working distance is 60 m, and the spot radius of each field of view angle is better than 5.3 μm, (b) is the optical system point spread diagram when the working distance is 50 km, and the spot radius of each field of view angle is better than 4.9 μm.
[0033] Figure 4 The field area and distortion diagram of the optical system provided by the utility model. The arc field curvature and meridian field curvature are within the focal depth range, and the maximum distortion of the system is less than 0.32%.
[0034] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.
[0035] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, several deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.
Claims
1. A long working distance visible light target detection optical system characterized by, The system comprises a first lens (1), a second lens (2), a third lens (3), a diaphragm (4), a fourth lens (5), a fifth lens (6), a sixth lens (7), a seventh lens (8), a detector protection glass (9) and a detector target surface (10) arranged coaxially in sequence; The incident light beam is sequentially imaged on the detector target surface (10) after passing through the first lens (1), the second lens (2), the third lens (3), the diaphragm (4), the fourth lens (5), the fifth lens (6), the sixth lens (7), the seventh lens (8) and the detector protection glass (9); The first lens (1) is a positive lens with a focal length of 65-75 mm; The second lens (2) is a positive lens with a focal length of 45-55 mm; The third lens (3) is a negative lens with a focal length of -23 to -13 mm; The fourth lens (5) is a positive lens with a focal length of 16-26 mm; The fifth lens (6) is a positive lens with a focal length of 150-160 mm; The sixth lens (7) is a positive lens with a focal length of 52-62 mm; The seventh lens (8) is a negative lens with a focal length of -25 to -15 mm; The pixel size of the detector target surface (10) is 5.5 μm.
2. The long working distance visible light target detection optical system according to claim 1, characterized in that: The center thickness of the first lens (1) is 2.9-4.9 mm; The center thickness of the second lens (2) is 2.6-4.6 mm; The center thickness of the third lens (3) is 2-4 mm; The center thickness of the fourth lens (5) is 3-5 mm; The center thickness of the fifth lens (6) is 2.8-4.8 mm; The center thickness of the sixth lens (7) is 2.2-4.2 mm; The center thickness of the seventh lens (8) is 1.9-3.9 mm.
3. The long working distance visible light target detection optical system according to claim 1, characterized in that: The distance between the first lens (1) and the second lens (2) is 0.3-0.8 mm; The distance between the second lens (2) and the third lens (3) is 1.3-3.3 mm; The distance between the third lens (3) and the diaphragm (4) is 2.8-4.8 mm; The distance between the diaphragm (4) and the fourth lens (5) is 0.5-2.5 mm; The distance between the fourth lens (5) and the fifth lens (6) is 1-3 mm; The distance between the fifth lens (6) and the sixth lens (7) is 2-4 mm; The distance between the sixth lens (7) and the seventh lens (8) is 1.8-3.8 mm; The distance between the seventh lens (8) and the detector protection glass (9) is 2-6 mm; The distance between the detector protection glass (9) and the detector target surface (10) is 0.5-1.5 mm.
4. The long working distance visible light target detection optical system according to claim 1, characterized in that: The first lens (1) satisfies the relation: N d ≥ 1.4, V d ≥ 67; The second lens (2) satisfies the relationship: N d ≥ 1.5, V d ≥ 68; The third lens (3) satisfies the relation: N d ≥ 1.6, V d ≥ 33; The fourth lens (5) satisfies the relationship: N d ≥ 1.5, V d ≥ 75; The fifth lens (6) satisfies the relation: N d ≥ 1.9, V d ≥ 20; The sixth lens (7) satisfies the relation: N d ≥ 1.6, V d ≥ 44; The seventh lens (8) satisfies the relation: N d ≥ 1.8, V d ≥ 25; The detector protection glass (9) satisfies the relationship: N d ≥ 1.5, V d ≥ 54; wherein N d is the refractive index and V d is the Abbe number.
5. The long working distance visible target detection optical system of claim 1, wherein: The imaging spectral range of the optical system is between 450 nm and 850 nm.
6. The long working distance visible target detection optical system of claim 1, wherein: The field of view angle of the optical system is 28°.