Method for selecting a lens for a deep-sea laser light

Abstract

The application relates to the technical field of light-emitting deep-sea lighting devices, and particularly discloses a selection method for lenses of deep-sea laser lamps, which comprises the following steps: (1) providing a plurality of to-be-tested lenses and a test system; (2) installing two same or different to-be-tested lenses at a first lens placing position and a second lens placing position of the test system, measuring a minimum light-emitting angle of the light source in air by controlling the distance between the diaphragm, the first lens placing position and the second lens placing position; and (3) calculating a minimum light-emitting angle i of the light source in seawater. min1 If i min1 ≤ 2°, the to-be-tested lens can be used as the lens of the deep-sea laser lamp; and if i min1 > 2°, the to-be-tested lens cannot be used as the lens of the deep-sea laser lamp. The application takes the light-emitting angle as a criterion to select the lens, thereby providing a good basis for the design of the deep-sea laser lamp.

Description

Technical Field

[0001] This invention relates to the field of deep-sea lighting devices, and more particularly to a method for selecting lenses for deep-sea laser lights. Background Technology

[0002] Due to the unique darkness of the deep sea, active illumination is essential for deep-sea exploration. Therefore, deep-sea lighting is indispensable equipment for deep-sea exploration. The propagation of light in seawater differs significantly from its propagation in air. For example, seawater's absorption and scattering of light easily causes light attenuation and color changes. Furthermore, the high pressure of the deep-sea environment places specific demands on the intensity of the lighting equipment, limiting its size and necessitating the inclusion of specific protective structures to reduce corrosion and withstand high pressure. Thus, the design of deep-sea lighting equipment differs considerably from that of conventional air-based devices.

[0003] In existing common lighting fixtures (in air), multiple lens modules are typically used to shape the light emitted from the light source, that is, to adjust the light emission angle and light emission surface of the light source. It is evident that lens modules are of great importance in lighting fixture design. However, due to the significant differences between the deep-sea environment and the air environment, structural designs suitable for air may not be suitable for deep-sea structures. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for selecting lenses for deep-sea laser lights, providing a basis for optical design in deep-sea scenarios.

[0005] To address the technical problem of this invention, this invention provides a method for selecting a lens for a deep-sea laser light, comprising:

[0006] (1) Provide multiple lenses under test and testing systems;

[0007] The testing system includes a light source, an aperture, a first lens placement position, a second lens placement position, and a light-transmitting cover. The light emitted by the light source passes sequentially through the aperture, the lens under test installed at the first lens placement position, the lens under test installed at the second lens placement position, and the light-transmitting cover before being emitted.

[0008] (2) Install two identical or different lenses to be tested at the first lens placement position and the second lens placement position of the test system, and measure the minimum light emission angle of the light source in the air by controlling the distance between the aperture, the first lens placement position and the second lens placement position.

[0009] The minimum light emission angle of the light source in seawater is calculated using the following set of formulas:

[0010]

[0011] k = 937.61d + 1.0104

[0012] Where n1 is the refractive index of seawater, n2 is the refractive index of air, and i min1 i is the minimum light emission angle of the light source in seawater. min2 denoted as the minimum light emission angle of the light source in air, k as the scattering coefficient, and d as the average particle size of suspended matter in seawater.

[0013] If i min1 If the angle is ≤2°, the lens under test can be used as a lens for a deep-sea laser light; if i min1 If the angle is greater than 2°, the lens under test cannot be used as a lens for a deep-sea laser light.

[0014] As an improvement to the above technical solution, the light emission angle of the light source is 50°-80°.

[0015] As an improvement to the above technical solution, the maximum distance between the aperture and the first lens placement position is ≤25mm.

[0016] As an improvement to the above technical solution, the maximum distance between the aperture and the second lens placement position is ≤45mm.

[0017] As an improvement to the above technical solution, the light-transmitting cover is made of sapphire glass, and the distance between it and the aperture is 40-70mm.

[0018] As an improvement to the above technical solution, it also includes:

[0019] (4) Install the selected lens to be tested at the first lens placement position and the second lens test position of the test system, and measure the uniformity of the light spot of the light source in the air.

[0020] During the measurement, the ratio between the distance between the first lens placement position and the aperture stop and the focal length of the lens installed at the first lens placement position is 1:(5-10), and the ratio between the distance between the second lens placement position and the aperture stop and the focal length of the lens installed at the second lens placement position is 1:(1.5-5).

[0021] The illuminance at the center and edge of the light spot was measured at a distance of 20m from the aperture, and the uniformity of the light spot was calculated according to the following formula.

[0022]

[0023] Where ΔE is the uniformity of the light spot, E e E represents the illuminance at the edge of the light spot. c The illuminance at the center of the light spot;

[0024] If ΔE ≥ 0.5, the lens under test can be used as a lens for a deep-sea laser light; if ΔE < 0.5, the lens under test cannot be used as a lens for a deep-sea laser light.

[0025] As an improvement to the above technical solution, it also includes:

[0026] (5) Install the selected lens to be tested at the first lens placement position and the second lens test position of the test system, and measure the uniformity of the light spot color of the light source in the air.

[0027] During the measurement, the ratio between the distance between the first lens placement position and the aperture stop and the focal length of the lens installed at the first lens placement position is 1:(5-6), and the ratio between the distance between the second lens placement position and the aperture stop and the focal length of the lens installed at the second lens placement position is 1:(1.5-3).

[0028] The chromaticity coordinates of the light spot at a distance of 20m from the aperture were measured, and the color uniformity of the light spot was calculated according to the following formula:

[0029]

[0030] Δx=x max -x min

[0031] Δy=y max -y min

[0032] Where △CS is the color uniformity of the light spot, x max Let x be the coordinate of the largest chromaticity in the light spot. min The coordinates of the smallest chromaticity in the light spot are x and y. max Let y be the coordinate of the largest chromaticity in the light spot. min Let y be the coordinate of the smallest chromaticity in the light spot;

[0033] If △CS≤0.025, the lens under test can be used as a lens for a deep-sea laser light; if △CS>0.025, the lens under test cannot be used as a lens for a deep-sea laser light.

[0034] As an improvement to the above technical solution, the diameter of the lens to be tested installed at the first lens placement position is 60-70mm.

[0035] As an improvement to the above technical solution, the diameter of the lens to be tested installed at the second lens placement position is 60-70mm.

[0036] As an improvement to the above technical solution, the light source is a white laser light source with a power of 50-120W.

[0037] Implementing this invention has the following beneficial effects:

[0038] Based on extensive analysis of the characteristics of deep-sea lighting, this invention proposes a method for selecting lenses based on the light emission angle, and constructs a corresponding testing system and selection method. The test results under air conditions are accurately mapped to the deep-sea environment, providing a solid foundation for the design of deep-sea laser lights. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a test system according to an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0041] This invention provides a method for selecting a deep-sea laser light, specifically including:

[0042] (1) Provide multiple lenses under test and testing systems;

[0043] Specifically, the lens under test is a common optical lens in the field, whose main function is to shape the light emitted by the light source. Based on the operating environment of the deep-sea laser light in this invention, its diameter should be controlled to ≤100mm. If its diameter is >100mm, the surface area of ​​the deep-sea laser light will be too large, resulting in excessive pressure in the deep-sea environment. Preferably, in one embodiment of this invention, the diameter of the lens under test is controlled to be 60-70mm. When the diameter of the lens under test is <60mm, the shaping effect on the light emitted by the light source is poor, so it is necessary to increase the data volume of the lens under test, which increases the length and surface area of ​​the deep-sea laser light. Exemplarily, the diameter of the lens under test is 61mm, 63mm, 65mm, 67mm, or 69mm, but is not limited to these.

[0044] refer to Figure 1 The testing system of this invention includes a light source 1, an aperture 2, a first lens placement position 3, a second lens placement position 4, and a light-transmitting cover 5. The light source 1 is fixed behind the aperture 2, while the first lens placement position 3, the second lens placement position 4, and the light-transmitting cover 5 are sequentially arranged in front of the aperture 2. Light emitted from the light source 1 passes through the aperture 2, the lens under test mounted at the first lens placement position 3, the lens under test mounted at the second lens placement position 4, and the light-transmitting cover 5 before exiting.

[0045] The light source 1 is a white laser light source with a power ≥50W, preferably 50-120W. The light emission angle of the light source 1 is 50°-100°, preferably 50°-80°. Based on this light source 1, the test results in the air can be better correlated with those in seawater, while reducing the workload of lens selection.

[0046] The lenses mounted on the first lens placement position 4 and the second lens placement position 5, along with the light-transmitting cover 5, are coaxially arranged. The distances between the first lens placement position 4, the second lens placement position 5, and the aperture 1 are variable to facilitate measurement. Preferably, to reduce the workload of selection and improve testing accuracy, the distance between the aperture 2 and the first lens placement position 3 should be controlled to ≤25mm, and the distance between the aperture 3 and the second lens placement position 4 should be ≤45mm. Preferably, the distance between the aperture 2 and the first lens placement position 3 is 10-25mm, and the distance between the aperture 2 and the second lens placement position 4 is 20-42mm.

[0047] The light-transmitting cover 5 is made of transparent glass, which can be made of inorganic or organic materials. Sapphire glass is preferred due to its excellent heat dissipation and high strength and compressive strength. The distance between the light-transmitting cover 5 and the aperture 2 is ≤70mm to prevent the deep-sea laser light from becoming too long. Preferably, the distance between the light-transmitting cover 5 and the aperture 2 is 40-70mm.

[0048] (2) Install two identical or different lenses to be tested at the first lens placement position and the second lens placement position of the test system. By controlling the distance between the aperture, the first lens placement position and the second lens placement position, the minimum light emission angle of the light source in the air is measured.

[0049] (3) Calculate the minimum light emission angle of the light source in seawater according to the following set of formulas:

[0050]

[0051] k = 937.61d + 1.0104

[0052] Where n1 is the refractive index of seawater, with a value ranging from 0.33 to 0.35, n2 is the refractive index of air, and i min1 i is the minimum light emission angle of the light source in seawater. min2 denoted as the minimum light emission angle of the light source in air, k as the scattering coefficient, and d as the average particle size of suspended matter in seawater, both in meters.

[0053] If i min1 If the angle is ≤2°, the lens under test can be used as a lens for a deep-sea laser light; if i min1 If the angle is greater than 2°, the lens under test cannot be used as a lens for a deep-sea laser light.

[0054] The measurement of the light emission angle can be referenced in the "Standard for High-Speed ​​Marine Searchlights for Ships and Marine Technology" (GB / T24954-2010).

[0055] Preferably, in one embodiment of the present invention, it further includes:

[0056] (4) Install the selected lens to be tested at the first lens placement position and the second lens test position of the test system, and measure the uniformity of the light spot of the light source in the air.

[0057] During the measurement, the ratio between the distance between the first lens placement position and the aperture stop and the focal length of the lens installed at the first lens placement position is 1:(5-10), and the ratio between the distance between the second lens placement position and the aperture stop and the focal length of the lens installed at the second lens placement position is 1:(1.5-5).

[0058] The illuminance at the center and edge of the light spot was measured at a distance of 20m from the aperture, and the uniformity of the light spot was calculated according to the following formula.

[0059]

[0060] Where ΔE is the uniformity of the light spot, E e E represents the illuminance at the edge of the light spot. c The illuminance at the center of the light spot;

[0061] If ΔE ≥ 0.5, the lens under test can be used as a lens for a deep-sea laser light; if ΔE < 0.5, the lens under test cannot be used as a lens for a deep-sea laser light.

[0062] For illuminance testing, please refer to "Methods for Measuring Lighting" (GB / T 5700-2008).

[0063] Furthermore, in another embodiment of the present invention, it also includes:

[0064] (5) Install the selected lens to be tested at the first lens placement position and the second lens test position of the test system, and measure the uniformity of the light spot color of the light source in the air.

[0065] During the measurement, the ratio between the distance between the first lens placement position and the aperture stop and the focal length of the lens installed at the first lens placement position is 1:(5-6), and the ratio between the distance between the second lens placement position and the aperture stop and the focal length of the lens installed at the second lens placement position is 1:(1.5-3).

[0066] The chromaticity coordinates of the light spot at a distance of 20m from the aperture were measured, and the color uniformity of the light spot was calculated according to the following formula:

[0067]

[0068] Δx=x max -x min

[0069] Δy=y max -y min

[0070] Where △CS is the color uniformity of the light spot, x max Let x be the coordinate of the largest chromaticity in the light spot. min The coordinates of the smallest chromaticity in the light spot are x and y. max Let y be the coordinate of the largest chromaticity in the light spot. min Let y be the coordinate of the smallest chromaticity in the light spot;

[0071] If △CS≤0.025, the lens under test can be used as a lens for a deep-sea laser light; if △CS>0.025, the lens under test cannot be used as a lens for a deep-sea laser light.

[0072] Furthermore, preferably, in this step, the light emission angle of light source 1 is controlled to be the minimum light emission angle, and the determination rule is as follows:

[0073] If △CS≤0.02, the lens under test can be used as a lens for a deep-sea laser light; if △CS>0.02, the lens under test cannot be used as a lens for a deep-sea laser light.

[0074] For the testing of chromaticity coordinates, please refer to "Methods for Illumination Measurement" (GB / T 5700-2008).

[0075] The above description is a preferred embodiment of the invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the invention, and these improvements and modifications are also considered to be within the scope of protection of the invention.

Claims

1. A method for selecting a lens for a deep-sea laser light, characterized in that, include: (1) Provide multiple lenses under test and testing systems; The testing system includes a light source, an aperture, a first lens placement position, a second lens placement position, and a light-transmitting cover. The light emitted by the light source passes sequentially through the aperture, the lens under test installed at the first lens placement position, the lens under test installed at the second lens placement position, and the light-transmitting cover before being emitted. (2) Install two identical or different lenses to be tested at the first lens placement position and the second lens placement position of the test system, and measure the minimum light emission angle of the light source in the air by controlling the distance between the aperture, the first lens placement position and the second lens placement position. (3) Calculate the minimum light emission angle of the light source in seawater according to the following set of formulas: k = 937.61d + 1.0104 Where n1 is the refractive index of seawater, n2 is the refractive index of air, and i min1 i is the minimum light emission angle of the light source in seawater. min2 denoted as the minimum light emission angle of the light source in air, k as the scattering coefficient, and d as the average particle size of suspended matter in seawater. If i min1 If the angle is ≤2°, the lens under test can be used as a lens for a deep-sea laser light; if i min1 If the angle is greater than 2°, the lens under test cannot be used as a lens for a deep-sea laser light.

2. The lens selection method for deep-sea laser lights as described in claim 1, characterized in that, The light emission angle of the light source is 50°-80°.

3. The lens selection method for deep-sea laser lights as described in claim 1, characterized in that, The maximum distance between the aperture and the first lens placement position is ≤25mm.

4. The lens selection method for deep-sea laser lights as described in claim 3, characterized in that, The maximum distance between the aperture and the second lens placement position is ≤45mm.

5. The lens selection method for deep-sea laser lights as described in claim 4, characterized in that, The light-transmitting cover is made of sapphire glass, and the distance between it and the aperture is 40-70mm.

6. The lens selection method for deep-sea laser lights as described in claim 1, characterized in that, Also includes: (4) The selected lenses to be tested are installed at the first lens placement position and the second lens test position of the test system, and the uniformity of the light spot of the light source in the air is measured. During the measurement, the ratio between the distance between the first lens placement position and the aperture stop and the focal length of the lens installed at the first lens placement position is 1:(5-10), and the ratio between the distance between the second lens placement position and the aperture stop and the focal length of the lens installed at the second lens placement position is 1:(1.5-5). The illuminance at the center and edge of the light spot was measured at a distance of 20m from the aperture, and the uniformity of the light spot was calculated according to the following formula. Where ΔE is the uniformity of the light spot, E e E represents the illuminance at the edge of the light spot. c The illuminance at the center of the light spot; If ΔE ≥ 0.5, the lens under test can be used as a lens for a deep-sea laser light; if ΔE < 0.5, the lens under test cannot be used as a lens for a deep-sea laser light.

7. The lens selection method for deep-sea laser lights as described in claim 6, characterized in that, Also includes: (5) Install the selected lens to be tested at the first lens placement position and the second lens test position of the test system, and measure the uniformity of the light spot color of the light source in the air. During the measurement, the ratio between the distance between the first lens placement position and the aperture stop and the focal length of the lens installed at the first lens placement position is 1:(5-6), and the ratio between the distance between the second lens placement position and the aperture stop and the focal length of the lens installed at the second lens placement position is 1:(1.5-3). The chromaticity coordinates of the light spot at a distance of 20m from the aperture were measured, and the color uniformity of the light spot was calculated according to the following formula: Δx=x max -x min Δy = y max -y min Where △CS is the color uniformity of the light spot, x max Let x be the coordinate of the largest chromaticity in the light spot. min Let x and y be the coordinates of the smallest chromaticity in the light spot. max Let y be the coordinate of the largest chromaticity in the light spot. min Let y be the coordinate of the smallest chromaticity in the light spot; If △CS≤0.025, the lens under test can be used as a lens for a deep-sea laser light; if △CS>0.025, the lens under test cannot be used as a lens for a deep-sea laser light.

8. The lens selection method for deep-sea laser lights as described in any one of claims 1-7, characterized in that, The diameter of the lens to be tested, installed at the first lens placement position, is 60-70mm.

9. The lens selection method for deep-sea laser lights as described in any one of claims 1-7, characterized in that, The diameter of the lens to be tested, installed at the second lens placement position, is 60-70 mm.

10. The lens selection method for deep-sea laser lights as described in any one of claims 1-7, characterized in that, The light source is a white laser light source with a power of 50-120W.

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