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

Abstract

The present application relates to the technical field of deep-sea lighting device, and particularly discloses a selection method for light source of deep-sea laser lamp, which comprises the following steps: (1) providing a plurality of to-be-tested light sources; (2) determining the minimum light-emitting angle of each light source in air by using a test system; (3) calculating the minimum light-emitting angle i of the to-be-tested light source in seawater min1 ; if i min1 ≤ 2°, the to-be-tested light source can be used as the light source of the deep-sea laser lamp; if i min1 > 2°, the to-be-tested light source cannot be used as the light source of the deep-sea laser lamp. The present application selects the light source of the deep-sea laser lamp by taking the light-emitting angle as the reference, and provides a good foundation 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. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a method for selecting a light source for deep-sea laser lights, providing a basis for optical design in deep-sea scenarios.

[0004] To address the technical problem of this invention, this invention provides a method for selecting a light source for a deep-sea laser light, comprising:

[0005] (1) Provide multiple light sources to be tested;

[0006] (2) The minimum light emission angle of each light source in air was measured using a testing system;

[0007] The testing system includes a coaxially arranged light source fixing device, an aperture, a first lens, a second lens, and a light-transmitting cover; the light emitted by the light source under test, which is fixed to the light source fixing device, passes through the aperture, the first lens, the second lens, and the light-transmitting cover in sequence.

[0008] The minimum light emission angle of the light source in air is obtained by controlling the distance between the aperture stop, the first lens, and the second lens.

[0009] (3) Calculate the minimum light emission angle of the light source under test in seawater according to the following set of formulas;

[0010]

[0011] k = 0.9376r + 1.0104

[0012] Where n1 is the refractive index of seawater, n2 is the refractive index of air, and i min1 Let i be the light emission angle of the light source under test in seawater. min2denoted as the minimum light emission angle of the light source under test in air, k is the scattering coefficient, and r is the average particle size of suspended matter in seawater.

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

[0014] As an improvement to the above technical solution, it also includes:

[0015] (4) The color uniformity of the selected light source spot in the air was measured using the test system described above;

[0016] During the measurement, the ratio of the distance between the first lens and the aperture stop to the focal length of the first lens is 1:(5-6), and the ratio of the distance between the second lens and the aperture stop to the focal length of the second lens is 1:(1.5-3).

[0017] 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:

[0018]

[0019] Δx=x max -x min

[0020] Δy=y max -y min

[0021] 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;

[0022] If △CS≤0.025, the light source to be tested can be used as the light source for a deep-sea laser lamp; if △CS>0.025, the light source to be tested cannot be used as the light source for a deep-sea laser lamp.

[0023] As an improvement to the above technical solution, it also includes:

[0024] (5) The test system is used to measure the spot diameter of the selected light source in air and to calculate the spot diameter of the light source in seawater;

[0025] During the measurement, the ratio of the distance between the first lens and the aperture stop to the focal length of the first lens is 1:(5-6), and the ratio of the distance between the second lens and the aperture stop to the focal length of the second lens is 1:(1.5-3).

[0026] The light spot was measured at a distance of 20m from the aperture, and the diameter of the light spot in seawater was calculated using the following set of formulas:

[0027] D1 = D2·tani1

[0028]

[0029] k1 = 0.9376r + 1.0104

[0030] Where D1 is the beam diameter of the light source at a distance of 20m in seawater, D2 is the beam diameter of the light source at a distance of 20m in air, k1 is the first scattering coefficient, i1 is the light emission angle of the light source in seawater, i2 is the light emission angle of the light source in air, n1 is the refractive index of seawater, n2 is the refractive index of air, and r is the average particle size of suspended matter in seawater.

[0031] If D1 < 2.5m, the light source to be tested can be used as the light source for a deep-sea laser lamp; if D1 ≥ 2.5m, the light source to be tested cannot be used as the light source for a deep-sea laser lamp.

[0032] As an improvement to the above technical solution, it also includes:

[0033] (6) The luminous flux of the selected light sources is measured using the test system, and the average illuminance of the light sources in seawater is calculated.

[0034] During the measurement, the ratio of the distance between the first lens and the aperture stop to the focal length of the first lens is 1:(5-6), and the ratio of the distance between the second lens and the aperture stop to the focal length of the second lens is 1:(1.5-3).

[0035] The illuminance of the light spot was measured at a distance of 20m from the aperture. The light spot was divided into 5-10 concentric rings, and the illuminance of each ring was measured. The luminous flux of the light source was then calculated and selected according to the following set of formulas:

[0036]

[0037]

[0038]

[0039] k1 = 0.9376r + 1.0104

[0040] k2 = 0.0006d 2-0.0352d+1

[0041] k3 = -46.886r 3 -6.5278r 2 -1.7699r + 0.9697

[0042] Where E2 is the luminous flux of the light source in the air, Φ 2nd Let S be the illuminance of the nth ring of the light source at a distance d in the air. 2nd Let Φ be the area of ​​the nth ring at a distance d from the light source in the air; 1d Let D be the average illuminance of the light source at a distance d in the seawater. 2d Let d be the diameter of the light spot at a distance d in the air, i1 be the light emission angle of the light source in the seawater under the test conditions, i2 be the light emission angle of the light source in the air under the test conditions, n1 be the refractive index of the seawater, n2 be the refractive index of the air, r be the average particle size of the suspended matter in the seawater, and d be the detection distance of the light source in the air.

[0043] As an improvement to the above technical solution, in step (6), the detection distance is 20m;

[0044] If Φ 1d If the value is ≥200 lx, then the light source to be tested can be used as the light source for a deep-sea laser light; if Φ 1d If the value is less than 200 lx, the light source to be tested cannot be used as the light source for deep-sea laser lights.

[0045] As an improvement to the above technical solution, the distance between the aperture and the first lens is ≤25mm.

[0046] As an improvement to the above technical solution, the diameter of the first lens is 60-70mm.

[0047] As an improvement to the above technical solution, the distance between the aperture and the second lens is ≤45mm.

[0048] As an improvement to the above technical solution, the diameter of the second lens is 60-70mm.

[0049] As an improvement to the above technical solution, the light-transmitting cover is made of sapphire glass, and the distance between it and the second lens is 12-25mm.

[0050] Implementing this invention has the following beneficial effects:

[0051] Based on extensive analysis of the characteristics of deep-sea lighting, this invention proposes a method for selecting light sources using the light emission angle as a benchmark, 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

[0052] Figure 1 This is a schematic diagram of a test system according to an embodiment of the present invention. Detailed Implementation

[0053] 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.

[0054] This invention provides a method for selecting a light source for a deep-sea laser light, comprising:

[0055] (1) Provide multiple light sources to be tested;

[0056] (2) The minimum light emission angle of each light source in air was measured using a testing system;

[0057] refer to Figure 1 The testing system of the present invention includes a light source fixing device 1, an aperture 2, a first lens 3, a second lens 4, and a light-transmitting cover 5. The light source to be tested is fixed behind the aperture 2 by the light source fixing device 1, while the first lens 3, the second lens 4, and the light-transmitting cover 5 are sequentially arranged in front of the aperture 2. Light emitted from the light source 1 is emitted after passing through the aperture 2, the first lens 3, the second lens 4, and the light-transmitting cover 5.

[0058] The first lens 4, the second lens 5, and the light-transmitting cover 5 are coaxially arranged. The distance between the first lens 4, the second lens 5, and the aperture 1 is variable to facilitate measurement. Preferably, to reduce the workload of selection and improve the accuracy of testing, the maximum distance between the aperture 2 and the first lens 3 should be controlled to ≤25mm, and the maximum distance between the aperture 3 and the second lens 4 should be controlled to ≤45mm. Preferably, the distance between the aperture 2 and the first lens 3 is 10-25mm, and the distance between the aperture 2 and the second lens 4 is 20-42mm. The diameter of the first lens 3 and the second lens 4 is ≤100mm. If their diameter is >100mm, the surface area of ​​the deep-sea laser lamp will be too large, resulting in excessive pressure in the deep-sea environment. Preferably, in one embodiment of the present invention, the diameter of the first lens 3 and the second lens 4 is controlled to be 60-70mm.

[0059] 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.

[0060] Specifically, in one embodiment of the present invention, the minimum light emission angle of the light source in the air is obtained by controlling the distance between the aperture 2, the first lens 3, and the second lens 4.

[0061] (3) Calculate the minimum light emission angle of the light source under test in seawater according to the following set of formulas;

[0062]

[0063] k = 0.9376r + 1.0104

[0064] Where n1 is the refractive index of seawater, n2 is the refractive index of air, and i min1 Let i be the light emission angle of the light source under test in seawater. min2 θ is the minimum light emission angle of the light source under test in air, k is the scattering coefficient, and r is the average particle size of suspended matter in seawater, in mm.

[0065] If i min1 If the angle is ≤2°, the light source to be tested can be used as the light source for a deep-sea laser light; if i min1 If the angle is greater than 2°, the light source to be tested cannot be used as the light source for deep-sea laser lights.

[0066] 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).

[0067] (4) The color uniformity of the selected light source in the air was measured using a testing system;

[0068] During the measurement, the ratio of the distance between the first lens 3 and the aperture 2 to the focal length of the first lens 3 is 1:(5-6), and the ratio of the distance between the second lens 4 and the aperture 2 to the focal length of the second lens 4 is 1:(1.5-3).

[0069] 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:

[0070]

[0071] Δx=x max -x min

[0072] Δy=y max -y min

[0073] 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;

[0074] If △CS≤0.025, the light source to be tested can be used as the light source for a deep-sea laser lamp; if △CS>0.025, the light source to be tested cannot be used as the light source for a deep-sea laser lamp.

[0075] For the testing of chromaticity coordinates, please refer to "Methods for Illumination Measurement" (GB / T 5700-2008).

[0076] Furthermore, in this step, the light emission angle is controlled to be the minimum light emission angle, and the determination rule is as follows:

[0077] If △CS≤0.02, the light source to be tested can be used as the light source for a deep-sea laser light; if △CS>0.02, the light source to be tested cannot be used as the light source for a deep-sea laser light.

[0078] (5) The test system was used to measure the spot diameter of the selected light source in the air and to calculate the spot diameter of the light source in the seawater.

[0079] During the measurement, the ratio of the distance between the first lens 3 and the aperture 2 to the focal length of the first lens 3 is 1:(5-6), and the ratio of the distance between the second lens 4 and the aperture 2 to the focal length of the second lens 4 is 1:(1.5-3).

[0080] The light spot was measured at a distance of 20m from the aperture, and the diameter of the light spot in seawater was calculated using the following set of formulas:

[0081] D1 = D2·tani1

[0082]

[0083] k1 = 0.9376r + 1.0104

[0084] Where D1 is the beam diameter of the light source at a distance of 20m in seawater, D2 is the beam diameter of the light source at a distance of 20m in air, k1 is the first scattering coefficient, i1 is the light emission angle of the light source in seawater, i2 is the light emission angle of the light source in air, n1 is the refractive index of seawater, n2 is the refractive index of air, and r is the average particle size of suspended matter in seawater, in mm.

[0085] If D1 < 2.5m, the light source to be tested can be used as the light source for a deep-sea laser lamp; if D1 ≥ 2.5m, the light source to be tested cannot be used as the light source for a deep-sea laser lamp.

[0086] Furthermore, in this step, the light emission angle is controlled to be the minimum light emission angle, and the determination rule is as follows:

[0087] If D1 < 2m, the light source to be tested can be used as the light source for a deep-sea laser lamp; if D1 ≥ 2m, the light source to be tested cannot be used as the light source for a deep-sea laser lamp.

[0088] (6) The luminous flux of the selected light sources was measured using a testing system, and the average illuminance of the light sources in seawater was calculated.

[0089] During the measurement, the ratio of the distance between the first lens 3 and the aperture 2 to the focal length of the first lens 3 is 1:(5-6), and the ratio of the distance between the second lens 4 and the aperture 2 to the focal length of the second lens 4 is 1:(1.5-3).

[0090] The illuminance of the light spot was measured at a distance of 20m from the aperture. The light spot was divided into 5-10 concentric rings, and the illuminance of each ring was measured. The luminous flux of the light source was then calculated and selected according to the following set of formulas:

[0091]

[0092]

[0093]

[0094] k1 = 0.9376r + 1.0104

[0095] k2 = 0.0006d 2 -0.0352d+1

[0096] k3 = -46.886r 3 -6.5278r 2 -1.7699r + 0.9697

[0097] Where E2 is the luminous flux of the light source in the air, Φ 2nd Let S be the illuminance of the nth ring of the light source at a distance d in the air. 2nd Let Φ be the area of ​​the nth ring at a distance d from the light source in the air; 1d Let D be the average illuminance of the light source at a distance d in the seawater. 2d d is the diameter of the light spot at a distance d in the air; i1 is the light emission angle of the light source in seawater under test conditions; i2 is the light emission angle of the light source in air under test conditions; n1 is the refractive index of seawater; n2 is the refractive index of air; r is the average particle size of suspended matter in seawater, in mm; d is the detection distance in air, in m.

[0098] For illuminance testing, please refer to "Methods for Measuring Lighting" (GB / T 5700-2008).

[0099] Specifically, in one embodiment of the present invention, the detection distance is 20m, and the light emission angle of the light source under test is the minimum light emission angle. At this time, if Φ 1d If the value is ≥200 lx, then the light source to be tested can be used as the light source for a deep-sea laser light; if Φ 1dIf the value is less than 200 lx, the light source to be tested cannot be used as the light source for deep-sea laser lights.

[0100] According to the method of the present invention, the following four light sources are selected:

[0101]

[0102] As can be seen from the table, the minimum emission angles of light sources A and D are both greater than 2°, making them unsuitable as light sources for deep-sea laser lights. While light source B meets the requirements for minimum emission angle, color coordinate deviation, and spot diameter, its illuminance is only 140 lx, less than 200 lx, making it unsuitable as a light source for deep-sea laser lights. Light source C meets the requirements for minimum emission angle, color uniformity, spot diameter at 20m, and spot illuminance at 20m; therefore, it can be selected as a light source for deep-sea laser lights.

[0103] 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 light source for a deep-sea laser light, characterized in that, include: (1) Provide multiple light sources to be tested; (2) The minimum light emission angle of each light source in air was measured using a testing system; The testing system includes a coaxially arranged light source fixing device, an aperture, a first lens, a second lens, and a light-transmitting cover; the light emitted by the light source under test, which is fixed to the light source fixing device, passes through the aperture, the first lens, the second lens, and the light-transmitting cover in sequence. The minimum light emission angle of the light source in air is obtained by controlling the distance between the aperture stop, the first lens, and the second lens. (3) Calculate the minimum light emission angle of the light source under test in seawater according to the following set of formulas; Where n1 is the refractive index of seawater, n2 is the refractive index of air, and i min1 Let i be the light emission angle of the light source under test in seawater. min2 denoted as the minimum light emission angle of the light source under test in air, k is the scattering coefficient, and r is the average particle size of suspended matter in seawater. If i min1 If the angle is ≤2°, the light source to be tested can be used as the light source for a deep-sea laser light; if i min1 If the angle is greater than 2°, the light source to be tested cannot be used as the light source for deep-sea laser lights.

2. The method for selecting a light source for a deep-sea laser light as described in claim 1, characterized in that, Also includes: (4) The color uniformity of the selected light source spot in the air was measured using the test system described above; During the measurement, the ratio of the distance between the first lens and the aperture stop to the focal length of the first lens is 1:(5-6), and the ratio of the distance between the second lens and the aperture stop to the focal length of the second lens 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 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; If △CS≤0.025, the light source to be tested can be used as the light source for a deep-sea laser lamp; if △CS>0.025, the light source to be tested cannot be used as the light source for a deep-sea laser lamp.

3. The method for selecting a light source for a deep-sea laser light as described in claim 2, characterized in that, Also includes: (5) The test system is used to measure the spot diameter of the selected light source in air and to calculate the spot diameter of the light source in seawater; During the measurement, the ratio of the distance between the first lens and the aperture stop to the focal length of the first lens is 1:(5-6), and the ratio of the distance between the second lens and the aperture stop to the focal length of the second lens is 1:(1.5-3). The light spot was measured at a distance of 20m from the aperture, and the diameter of the light spot in seawater was calculated using the following set of formulas: D1=D2·tani1 k1＝0.9376r+1.0104 Where D1 is the beam diameter of the light source at a distance of 20m in seawater, D2 is the beam diameter of the light source at a distance of 20m in air, k1 is the first scattering coefficient, i1 is the light emission angle of the light source in seawater, i2 is the light emission angle of the light source in air, n1 is the refractive index of seawater, n2 is the refractive index of air, and r is the average particle size of suspended matter in seawater. If D1 < 2.5m, the light source to be tested can be used as the light source for a deep-sea laser lamp; if D1 ≥ 2.5m, the light source to be tested cannot be used as the light source for a deep-sea laser lamp.

4. The method for selecting a light source for a deep-sea laser light as described in claim 3, characterized in that, Also includes: (6) The luminous flux of the selected light sources is measured using the test system, and the average illuminance of the light sources in seawater is calculated. During the measurement, the ratio of the distance between the first lens and the aperture stop to the focal length of the first lens is 1:(5-6), and the ratio of the distance between the second lens and the aperture stop to the focal length of the second lens is 1:(1.5-3). The illuminance of the light spot was measured at a distance of 20m from the aperture. The light spot was divided into 5-10 concentric rings, and the illuminance of each ring was measured. The luminous flux of the light source was then calculated and selected according to the following set of formulas: k1＝0.9376r+1.0104 k2=0.0006d 2 -0.0352d+1 k3＝-46.886r 3 -6.5278r 2 -1.7699r+0.9697 Where E2 is the luminous flux of the light source in the air, Φ 2nd Let S be the illuminance of the nth ring of the light source at a distance d in the air. 2nd Let Φ be the area of ​​the nth ring at a distance d from the light source in the air; 1d Let D be the average illuminance of the light source at a distance d in the seawater. 2d Let d be the diameter of the light spot at a distance d in the air, i1 be the light emission angle of the light source in the seawater under the test conditions, i2 be the light emission angle of the light source in the air under the test conditions, n1 be the refractive index of the seawater, n2 be the refractive index of the air, r be the average particle size of the suspended matter in the seawater, and d be the detection distance of the light source in the air.

5. The method for selecting a light source for a deep-sea laser light as described in claim 3, characterized in that, In step (6), the detection distance is 20m, and the light emission angle of the light source to be tested is the minimum light emission angle; If Φ 1d If the value is ≥200 lx, then the light source to be tested can be used as the light source for a deep-sea laser light; if Φ 1d If the value is less than 200 lx, the light source to be tested cannot be used as the light source for deep-sea laser lights.

6. The method for selecting a light source for a deep-sea laser lamp as described in any one of claims 1-5, characterized in that, The distance between the aperture and the first lens is ≤25mm.

7. The method for selecting a light source for a deep-sea laser lamp as described in any one of claims 1-5, characterized in that, The diameter of the first lens is 60-70mm.

8. The method for selecting a light source for a deep-sea laser lamp as described in any one of claims 1-5, characterized in that, The distance between the aperture and the second lens is ≤45mm.

9. The method for selecting a light source for a deep-sea laser lamp as described in any one of claims 1-5, characterized in that, The diameter of the second lens is 60-70mm.

10. The method for selecting a light source for a deep-sea laser lamp as described in any one of claims 1-5, characterized in that, The light-transmitting cover is made of sapphire glass, and the distance between it and the second lens is 12-25mm.

Images