Marine radiance meter immersion factor measurement method

Abstract

The invention discloses a marine radiance meter immersion factor measurement method, which belongs to the technical field of radiation value measurement, and comprises the following steps: controlling a stable halogen tungsten lamp to irradiate towards a calibration container below the calibration container, the bottom of the calibration container is a diffuse transmission plate to generate a uniform light field, and the calibration container is filled with ultrapure water; the method comprises the following steps: firstly, measuring the radiance value of the optical window of the radiance meter just immersed under the water surface, then discharging ultrapure water in a calibration container in sequence, and obtaining the radiance value when the distance between the optical window of the radiance meter and the water surface is zi; performing water attenuation correction on a measured value in the air of the radiance meter, and extrapolating to calculate radiance when zi is equal to 0; the refractive index of the water body is calculated, and the immersion factor of the to-be-measured radiometer is calculated. According to the marine radiance meter immersion factor measuring device, the problem that in theoretical calculation, only the radiance meter optical window refractive index is considered, and different radiance meter light path design influences are ignored, so that the deviation between a theoretical calculation result and an actual value is large is solved.

Description

Technical Field

[0001] The invention relates to the technical field of optical measurement, and in particular to a method for measuring the immersion factor of an ocean radiometer. Background Art

[0002] A radiometer is an instrument for measuring the distribution of radiance light field. The radiation calibration of a radiometer is usually carried out in laboratory air using a "standard irradiance lamp + standard reflector" or an integrating sphere light source as a standard material to obtain the absolute radiation calibration coefficient in air. However, when the radiometer works in water to measure the underwater radiance light field distribution, due to the change in the refractive index of the medium (the refractive index of water is about 1.3 times that of air), the transmittance and field angle of the optical window of the radiometer in water are changed compared to those in air. Therefore, the absolute radiation calibration coefficient in air cannot be used alone, and the transmittance and field angle need to be corrected, which is also called immersion factor correction.

[0003] In 1976, Autsin first theoretically derived a calculation model for the radiance immersion factor. This model only depends on the refractive index of seawater and the refractive index of the optical window of the radiance meter. The calculation formula is as follows: .

[0004] in, is the wavelength of light, is the refractive index of seawater, (λ) is the refractive index of the radiometer optical window, and IF is the radiance immersion correction factor.

[0005] However, in practice, the refractive index of the optical window of the radiometer is usually unknown, and different radiometers have different optical path designs, and the transmittance and field of view angle contribute differently to the immersion factor. Therefore, there is a deviation between the theoretical calculated value and the actual value and it is unknown. Summary of the invention

[0006] At present, the immersion factor of a radiometer is obtained by theoretical calculation of the refractive index of the optical window of the radiometer. However, the refractive index of the optical window of the radiometer is usually unknown, and different radiometers have different optical path designs, and the transmittance and field of view angle contribute differently to the immersion factor. Therefore, there is a large deviation between the theoretical calculation value and the actual value. In view of the above problems, the present invention proposes a method for measuring the immersion factor of an ocean radiometer, which can effectively solve the theoretical calculation error of the immersion factor caused by the unknown refractive index of the optical window and the different optical path structures.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems: A method for measuring an immersion factor of an ocean radiance meter, comprising: The halogen tungsten lamp is controlled to irradiate toward the calibration container from below the calibration container, the bottom of the calibration container is a diffuse transmission plate to generate a uniform light field, the calibration container is filled with ultrapure water, and the radiometer is located above the calibration container; The optical window of the radiometer is immersed in the ultrapure water in the calibration container. At this time, the radiometer measures ; The ultrapure water in the calibration container is discharged in sequence, so that the optical window of the radiometer is exposed to the air, and the distance between the optical window of the radiometer and the water surface during the ultrapure water discharge process is obtained. Radiometer measurement value , until all the ultrapure water in the calibration container is discharged; Cover the optical window of the radiometer and obtain the radiometer measurement value, that is, the noise value ; right Perform water attenuation correction to obtain the correction value : ; in, λ is the wavelength of light, T is the temperature of ultrapure water in the calibration container, c is the spectral attenuation coefficient of ultrapure water; calculate The radiance after water attenuation correction is expressed as ; Calculate the refractive index of water : ; in, ; , the unit is ; , unit is nm; , unit is nm / ℃; , the unit is ; , the unit is ; Calculating the Radiometer Immersion Factor : .

[0008] In some embodiments, The calculation method is: calculate The logarithm of , and the least squares fit is used to find and The logarithmic linear curve will Substituting into the linear curve, the calculated radiance is .

[0009] In some embodiments, the distance between the optical window of the radiometer and the water surface is The method to obtain is: ; in, is the height of each discharge during the ultrapure water discharge process, and d is the initial distance from the optical window of the radiometer to the bottom of the calibration container; Each discharge Highly ultrapure water, read the radiometer measurement value multiple times, and calculate the average to get .

[0010] In some embodiments, the ocean radiometer immersion factor measurement method uses an ocean radiometer immersion factor measurement device for measurement, and the ocean radiometer immersion factor measurement device includes: Base; A load-bearing bracket, which is fixed on the base; A radiometer bracket connected to the load-bearing bracket; a radiometer supported on the radiometer support; a calibration container support connected to the load-bearing support; The calibration container is supported on the calibration container support, the top of the calibration container is open, the side wall of the calibration container is painted black to prevent light from reflecting on the inner wall, at least the optical window of the radiometer is inserted into the calibration container, and the lower end of the side wall of the calibration container is provided with a drain port, and the drain port is provided with a drain valve; An aperture bracket, connected to the load-bearing bracket, the aperture bracket supports an aperture, and the aperture is located below the calibration container; The halogen tungsten lamp bracket is connected to the load-bearing bracket and is located below the aperture bracket. The halogen tungsten lamp is supported on the halogen tungsten lamp bracket.

[0011] In some embodiments, a slide rail is further included, and the slide rail is fixed on the load-bearing bracket. One or more of the radiance bracket, the aperture bracket and the halogen tungsten lamp bracket are slidably connected to the slide rail and fixed to the slide rail by bolts.

[0012] In some embodiments, a light-transmitting window is left on the side wall of the calibration container in the vertical direction, and a liquid level scale is arranged on the light-transmitting window.

[0013] In some embodiments, the aperture bracket and / or the halogen tungsten lamp bracket is a retractable structure.

[0014] In some embodiments, the measuring method of the ocean radiometer immersion factor measuring device further includes adjusting the arm length of the aperture bracket and / or the halogen tungsten lamp bracket so that the calibration container, the aperture and the halogen tungsten lamp are coaxially arranged.

[0015] In some embodiments, the measuring method of the ocean radiometer immersion factor measuring device further includes adjusting the aperture so that the light spot irradiated on the calibration container is consistent with the bottom surface of the calibration container.

[0016] In some embodiments, the base and the load-bearing bracket are both made of aluminum alloy, and the surfaces of the base and the load-bearing bracket are sprayed with a black coating.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are: The method for measuring the immersion factor of an ocean radiometer of the present invention measures the radiometer measurement value when the optical window of the radiometer is immersed in ultrapure water in a calibration container. , and the radiometer measurement value when the optical window is in the air under the same external environment , combined with the water refractive index, the irradiance meter immersion factor can be calculated. and All of them can be measured in the laboratory. The refractive index of water is related to water temperature and light wavelength, and can also be calculated. Therefore, the immersion factor of the radiometer in this scheme has higher accuracy and is less affected by external unknown factors. This method for measuring the immersion factor of the ocean radiometer does not require the refractive index of the optical window and the optical path structure of the radiometer, thereby avoiding the problem of large deviation between the theoretically calculated radiance immersion correction factor and the actual value.

[0018] The ocean radiometer immersion factor measuring device and the measuring method of the present invention define the immersion factor of the radiometer to be measured from the experimental process, avoiding the problem that only the refractive index of the radiometer optical window is considered in the theoretical calculation and the influence of different radiometer optical path designs is ignored, thereby avoiding the problem of large deviation from the actual value.

[0019] This scheme measures the immersion factor of the ocean radiance meter by designing a set of precise ocean radiance meter immersion factor measurement device and measurement steps. and , which is beneficial to improve and The measurement accuracy of the irradiance meter can be improved by

[0020] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a flow chart of an embodiment of the method for measuring the immersion factor of an ocean radiometer proposed by the present invention; Figure 2 It is a schematic structural diagram of an embodiment of a measuring device adopted by the method for measuring the immersion factor of an ocean radiance meter proposed by the present invention; Figure 3 This is a comparison chart between the ocean radiometer immersion factor measurement method proposed in the present invention and the measurement results of the prior art. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are merely for the convenience of description and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1: radiance refers to the luminous flux density in a certain direction within a unit area. Generally, a radiance meter is used to measure the radiance of the surface of an object.

[0027] When the radiometer is immersed in an underwater environment, due to the different optical refractive indices of air and water, the original radiometer calibration coefficient must be corrected before it can be applied to the underwater environment. This correction factor is called the immersion factor.

[0028] At present, the immersion factor of the radiometer is obtained by theoretical calculation of the refractive index of the optical window of the radiometer. However, the refractive index of the optical window of the radiometer is usually unknown and the optical path design of different radiometers is different. The transmittance and field angle also contribute differently to the immersion factor. Therefore, there is a technical problem that the theoretical calculation value deviates greatly from the actual value. In order to solve the above problem, this embodiment proposes a method for measuring the immersion factor of an ocean radiometer, such as Figure 1 As shown, including: Control the halogen tungsten lamp to illuminate the calibration container from the bottom. The bottom of the calibration container is a diffuse transmission plate to produce a uniform light field. The calibration container is filled with ultrapure water. The radiometer is located above the calibration container. The optical window of the radiometer is immersed in the ultrapure water in the calibration container. At this time, the radiometer measures By controlling the halogen tungsten lamp to irradiate toward the calibration container from below the calibration container, the light of the halogen tungsten lamp can be evenly irradiated into the optical window of the radiometer after being diffusely transmitted through the ultrapure water in the calibration container.

[0029] The bottom of the calibration container is calibrated as a diffuse transmission plate to generate a uniform light field, which is used to eliminate the problem of uneven light transmission caused by material or process problems at the bottom of the calibration container, so that the measurement experiment can avoid errors introduced by equipment as much as possible.

[0030] The ultrapure water in the calibration container is discharged in batches so that the optical window of the radiometer is exposed to the air. The distance between the optical window of the radiometer and the water surface during the ultrapure water discharge process is obtained respectively. Radiometer measurement value , until all the ultrapure water in the calibration container is drained. In this step, the light irradiated by the halogen tungsten lamp passes through ultrapure water at different depths and at different distances from the optical window to the water surface before being received by the optical window, thereby avoiding random errors introduced by measuring a single depth.

[0031] For example, in this scheme, after the optical window of the radiometer is exposed to the air, the ultrapure water in the standard container is discharged several times until it is completely discharged. The depth of each discharge is Take radiometer measurements when water is present.

[0032] Cover the optical window of the radiometer and obtain the radiometer measurement value, that is, the noise value .

[0033] right Perform water attenuation correction to obtain the correction value : .

[0034] in, λ is the wavelength of light, T is the temperature of ultrapure water in the calibration container, c is the spectral attenuation coefficient of ultrapure water.

[0035] In the formula, is the distance between the radiometer window and the water surface, λ is the wavelength, The height of the radiance meter from the water surface is The radiance is measured at is the dark current of the radiometer, that is, the noise value. Since the purpose of the present invention is to simultaneously obtain the radiometric radiance values ​​of the radiometer in the air and in the water at the same distance, the radiometric radiance value at the distance d in the water has been obtained, and the radiometric radiance at the distance d in the air is not suitable for direct measurement. The present invention measures the radiometric radiance values ​​in the air at different water surface heights by continuously changing the water surface height. Light in water attenuates according to the Beer-Lambert law, that is: .

[0036] in, is the intensity of light after passing through the medium, is the light intensity incident on the medium, c is the spectral attenuation coefficient of ultrapure water, z is the height of the radiometer from the water surface, so the radiometer measurement value needs to be Water attenuation correction is performed to correct the radiance value in the air when the water surface height is d. Therefore, according to the Beer-Lambert law, it is necessary to perform water attenuation correction on the radiometer measurement value after subtracting the noise value.

[0037] calculate The radiance after water attenuation correction is expressed as .

[0038] Calculate the refractive index of water : ; in, ; , the unit is ; , unit is nm; , unit is nm / ℃; , the unit is ; , the unit is .

[0039] Calculating the Radiometer Immersion Factor : .

[0040] According to the theory of geometric optics, the field of view of the radiometer in water and air is only related to the refractive index of air and seawater, that is: .

[0041] According to Fresnel's law, the water-air interface transmittance is calculated as follows: .

[0042] Since the theoretical derivation model of radiance immersion factor is: , combining the geometric optics theory and Fresnel's law, the immersion factor of the radiometer of this embodiment can be obtained: .

[0043] The method for measuring the immersion factor of the ocean radiance meter in this embodiment is to measure the radiance meter measurement value when the optical window of the radiance meter is immersed in the ultrapure water in the calibration container. , and the radiometer measurement value when the optical window is in the air under the same external environment , combined with the water refractive index, the irradiance meter immersion factor can be calculated. and All of them can be measured in the laboratory. The refractive index of water is related to water temperature and light wavelength, and can also be calculated. Therefore, the immersion factor of the radiometer in this scheme has higher accuracy and is less affected by external unknown factors.

[0044] The present method for measuring the immersion factor of an ocean radiometer does not require the known refractive index of the optical window and the optical path structure of the radiometer for calculation, thereby avoiding the problem of a large deviation between the theoretically calculated radiance immersion correction factor and the actual value.

[0045] The ocean radiometer immersion factor measuring device and the measuring method of the present application define the immersion factor of the radiometer to be measured from the experimental process, avoiding the problem that only the refractive index of the radiometer optical window is considered in the theoretical calculation and the influence of different radiometer optical path designs is ignored, thereby avoiding the problem of large deviation from the actual value.

[0046] This scheme measures the immersion factor of the ocean radiance meter by designing a set of precise ocean radiance meter immersion factor measurement device and measurement steps. and , which is beneficial to improve and The measurement accuracy of the irradiance meter can be improved by

[0047] According to the theory of geometric optics, the field of view of the radiometer in water and air is only related to the refractive index of air and water, that is: .

[0048] According to Fresnel's law, the water-air interface transmittance is calculated as follows: .

[0049] According to the above formula, the irradiance meter immersion factor can be obtained: : .

[0050] In some embodiments, The calculation is: calculate The logarithm of , and the least squares fit is used to find and The logarithmic linear curve will Substituting into the linear curve, the calculated radiance is .

[0051] In some embodiments, the distance between the optical window of the radiometer and the water surface is The method to obtain is: .

[0052] in, is the height of each discharge during the ultrapure water discharge process, and d is the initial distance from the optical window of the radiometer to the bottom of the calibration container.

[0053] Each discharge For ultrapure water with high purity, the current radiance value is measured multiple times using a radiance meter and averaged to obtain .

[0054] In some embodiments, the ocean radiance meter immersion factor measurement method uses an ocean radiance meter immersion factor measurement device for measurement, such as Figure 2 As shown, the ocean radiometer immersion factor measuring device comprises: a base 11, a load-bearing bracket 12, a radiometer bracket 13, a radiometer 14, a calibration container bracket 15, an aperture bracket 16 and a halogen tungsten lamp bracket 17. The load-bearing bracket 12 is fixed on the base 11, the radiometer 14 is supported on the radiometer bracket 13, the calibration container bracket 15 is connected to the load-bearing bracket 12, and the calibration container 18 is supported on the calibration container bracket 15. The top of the calibration container 18 is open, and a diffuse transmission plate 19 is arranged at the bottom. The side wall of the calibration container 18 is painted black to prevent light from being reflected on the inner wall. At least the optical window of the radiometer is inserted into the calibration container 18. A drainage port is provided at the lower end of the side wall of the calibration container 18, and a drainage valve 20 is arranged in the drainage port. The aperture bracket 16 is connected to the load-bearing bracket 12, and an aperture 21 is supported on the aperture bracket 16. The aperture 21 is located below the calibration container 18. The halogen tungsten lamp bracket 17 is connected to the load-bearing bracket 12 and is located below the aperture bracket 16 . The halogen tungsten lamp 22 is supported on the halogen tungsten lamp bracket 17 .

[0055] The radiometer 14 is fixed on the radiometer bracket 13, and the radiometer 14 is connected to the laptop computer 23 via a data acquisition line 24. The calibration container 18 has a height of not less than 50 cm and a diameter of not less than 40 cm, and is filled with ultrapure water.

[0056] The calibration container 18 is provided with a diffuse transmission plate 19 at the bottom, and its main function is to form a light source with uniform surface after the incident light from the light source passes through the diffuse transmission plate 19, which serves as a radiant brightness emitting light source.

[0057] The water outlet is provided with a valve 20 to control the water level in the calibration container 18, and the ultrapure water passes through the water pipe 27 and is stored in the container.

[0058] In some embodiments, the ocean radiometer immersion factor measuring device also includes a slide rail 25, which is fixed on the load-bearing bracket 12, and one or more of the radiometer bracket 13, the aperture bracket 16 and the halogen tungsten lamp bracket 17 are slidably connected to the slide rail 25 to move up and down, and are fixed to the slide rail 25 by bolts after the position is fixed.

[0059] The diaphragm 21 is fixed on the diaphragm bracket 16 , and the diaphragm bracket 16 can be extended and retracted in the vertical direction along the slide rail 25 , and can be adjusted so that its center is aligned with the center of the calibration container 18 .

[0060] The size of the aperture 21 can be adjusted so that the size of the transmitted light spot is consistent with the size of the calibration container 18 .

[0061] In some embodiments, the aperture bracket 16 and / or the halogen tungsten lamp bracket 17 are retractable structures. The halogen tungsten lamp 22 is fixed on the halogen tungsten lamp bracket 17. The process of measuring the immersion factor of the ocean radiance meter also includes adjusting the arm length of the aperture bracket 16 and / or the halogen tungsten lamp bracket 17 so that the calibration container 18, the aperture 21 and the halogen tungsten lamp 22 are coaxially arranged.

[0062] The halogen tungsten lamp 22 is connected to a voltage-stabilized power supply 28 so that the output intensity stability thereof is better than 99%.

[0063] The calibration container 18 is made of acrylic material, and the inner wall is painted to form a black inner wall to minimize light scattering.

[0064] In some embodiments, the base 11 and the load-bearing bracket 12 are both made of aluminum alloy, which ensures the strength of the device and reduces the weight.

[0065] The surfaces of the base 11 and the load-bearing bracket 12 are sprayed with a black coating, and the surfaces of the aluminum alloy are sandblasted with a black anodizing treatment to minimize light reflection.

[0066] The halogen tungsten lamp 22 shines on the diffuse transmission plate 19 through the aperture 21, forming a uniform surface light source. The diffuse transmission light passes through water bodies of different depths to reach the radiance meter window and is received by it. Therefore, the radiance meter 14 needs to perform water attenuation correction when measuring radiance at different depths.

[0067] In some embodiments, a light-transmitting window is left on the side wall of the calibration container 18 in the vertical direction, and a liquid level scale 26 is arranged on the light-transmitting window.

[0068] The minimum scale unit of the liquid level scale 26 is millimeter, and the background is transparent, so that the height of the ultrapure water level in the calibration container can be observed through the scale.

[0069] In some embodiments, the measuring method of the ocean radiometer immersion factor measuring device further includes adjusting the diaphragm 21 so that the light spot irradiated on the calibration container 18 is consistent with the bottom surface of the calibration container 18 .

[0070] The calibration process of the radiometer immersion factor is as follows: (1) Fix the tungsten-halogen lamp, aperture, calibration container and radiometer on their respective brackets.

[0071] (2) Adjust the radiometer bracket and the aperture bracket so that their centers are collinear with the center of the calibration container.

[0072] (3) Adjust the center of the halogen tungsten lamp so that it is in line with the center of the aperture.

[0073] (4) Turn on the halogen lamp and preheat it for 15-20 minutes.

[0074] (5) Adjust the aperture of the diaphragm so that the transmitted light is evenly illuminated on the diffuse transmission plate.

[0075] (6) Slowly inject ultrapure water into the calibration container until the optical window of the radiometer is just submerged. The distance from the optical window to the bottom of the calibration container is d. Measure and record the water temperature T.

[0076] (7) Turn on the radiometer and preheat for 15-20 minutes.

[0077] (8) Open the radiometer operating software, measure 5 times or more, and take the average value and record it as .

[0078] (9) Lower the water level in the calibration container by Δz. At this time, the distance between the radiance optical window and the water surface is Δz. , measure n times, take the average value and record it as .

[0079] (10) Repeat the above steps until all the water in the calibration container is pumped out. .

[0080] (11) Cover the optical window of the radiometer, measure the dark current 5 times or more, take the average value and record it as .

[0081] like Figure 3 As shown in FIG. 1 , the comparison between the experimental measurement results of the radiometer 8693 produced by TriOS of Germany by the present invention and the calculation results by the Austin theoretical formula in the background technology is shown. It can be seen that the theoretically calculated immersion factor is about 3% lower than the actual measured value.

[0082] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A method for measuring the immersion factor of an ocean radiance meter, characterized in that: include: The halogen tungsten lamp is controlled to irradiate toward the calibration container from below the calibration container, the bottom of the calibration container is a diffuse transmission plate to generate a uniform light field, the calibration container is filled with ultrapure water, and the radiometer is located above the calibration container; The optical window of the radiometer is immersed in the ultrapure water in the calibration container. At this time, the radiometer measures ; The ultrapure water in the calibration container is discharged in sequence, so that the optical window of the radiometer is exposed to the air, and the distance between the optical window of the radiometer and the water surface during the ultrapure water discharge process is obtained. Radiometer measurement value , until all the ultrapure water in the calibration container is discharged; Cover the optical window of the radiometer and obtain the radiometer measurement value, that is, the noise value ; right Perform water attenuation correction to obtain the correction value : ； in, λ is the wavelength of light, T is the temperature of ultrapure water in the calibration container, c is the spectral attenuation coefficient of ultrapure water; calculate The radiance after water attenuation correction is expressed as ; Calculate the refractive index of water : ； in, ; , the unit is ; , unit is nm; , unit is nm / ℃; , the unit is ; , the unit is ; Calculating the Radiometer Immersion Factor : 。 2. The method for measuring the immersion factor of an ocean radiometer according to claim 1, characterized in that: The calculation method is: calculate The logarithm of , and the least squares fit is used to find and The logarithmic linear curve will Substituting into the linear curve, the calculated radiance is .

3. The method for measuring the immersion factor of an ocean radiometer according to claim 1, characterized in that: Distance between the radiometer optical window and the water surface The method to obtain is: ； in, is the height of each discharge during the ultrapure water discharge process, and d is the initial distance from the optical window of the radiometer to the bottom of the calibration container; Each discharge Highly ultrapure water, read the radiometer measurement value multiple times, and calculate the average to get .

4. The method for measuring the immersion factor of an ocean radiometer according to any one of claims 1 to 3, characterized in that: The method for measuring the immersion factor of an ocean radiometer adopts an immersion factor measuring device of an ocean radiometer for measurement. The immersion factor measuring device of an ocean radiometer comprises: Base; A load-bearing bracket, which is fixed on the base; A radiometer bracket connected to the load-bearing bracket; a radiometer supported on the radiometer support; a calibration container support connected to the load-bearing support; The calibration container is supported on the calibration container support, the top of the calibration container is open, the side wall of the calibration container is painted black to prevent light from reflecting on the inner wall, at least the optical window of the radiometer is inserted into the calibration container, and the lower end of the side wall of the calibration container is provided with a drain port, and the drain port is provided with a drain valve; An aperture bracket, connected to the load-bearing bracket, the aperture bracket supports an aperture, and the aperture is located below the calibration container; The halogen tungsten lamp bracket is connected to the load-bearing bracket and is located below the aperture bracket. The halogen tungsten lamp is supported on the halogen tungsten lamp bracket.

5. The method for measuring the immersion factor of an ocean radiometer according to claim 4, characterized in that: It also includes a slide rail, which is fixed on the load-bearing bracket. One or more of the radiance bracket, the aperture bracket and the halogen tungsten lamp bracket are slidably connected to the slide rail and fixed to the slide rail by bolts.

6. The method for measuring the immersion factor of an ocean radiometer according to claim 4, characterized in that: A light-transmitting window is left on the side wall of the calibration container in the vertical direction, and a liquid level scale is arranged on the light-transmitting window.

7. The method for measuring the immersion factor of an ocean radiometer according to claim 4, characterized in that: The aperture bracket and / or the halogen tungsten lamp bracket are retractable structures.

8. The method for measuring the immersion factor of an ocean radiometer according to claim 7, characterized in that: The measuring method of the ocean radiometer immersion factor measuring device further includes adjusting the arm length of the aperture bracket and / or the halogen tungsten lamp bracket so that the calibration container, the aperture and the halogen tungsten lamp are coaxially arranged.

9. The method for measuring the immersion factor of an ocean radiometer according to claim 4, characterized in that: The measuring method of the ocean radiometer immersion factor measuring device further includes adjusting the aperture so that the light spot irradiated on the calibration container is consistent with the bottom surface of the calibration container.

10. The method for measuring the immersion factor of an ocean radiometer according to claim 4, characterized in that: The base and the load-bearing bracket are both made of aluminum alloy, and the surfaces of the base and the load-bearing bracket are sprayed with black coating.

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