Method for detecting visible light distance of ship navigation signal lamp

Abstract

The invention discloses a method for inspecting the visible light distance of a ship navigation signal lamp, relates to the technical field of ship navigation safety and inspection and detection, and solves the technical problems that an existing inspection mode for the visible light distance of the signal lamp is high in subjectivity, large in implementation difficulty and incapable of realizing quantitative traceability and has safety risks. The inspection method comprises the following steps: measuring absolute spectral radiation brightness and spatial light intensity distribution of the signal lamp; setting a standard observer visual function, and calculating to obtain reference luminous intensity according to the absolute spectral radiation brightness and the standard observer visual function; setting an illuminance threshold value at the eyes of the observer, and calculating a visible distance under the atmospheric condition according to the illuminance threshold value at the eyes of the observer and the reference luminous intensity; and comparing the visible distance under the atmospheric condition with the standard minimum visible distance of the signal lamp so as to obtain an inspection result. According to the invention, objectification, digitization and quantifiability of the test result are realized, and the accuracy and credibility of the test are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of ship navigation safety and inspection technology, and more specifically, to a method for inspecting the visible light distance of ship navigation signal lights. Background Technology

[0002] Ship navigation lights are critical equipment for collision avoidance, and their visibility distance directly affects navigational safety. The International Regulations for Preventing Collisions at Sea (COLREGs) and the regulations of various national classification societies clearly stipulate their installation location, color, horizontal and vertical light arcs, and minimum visibility distance. Currently, the inspection of the visibility distance of navigation lights mainly faces the following problems: 1. High subjectivity: Traditional methods mainly rely on visual observation by inspectors at different distances at night. The results are greatly affected by the inspectors' eyesight, weather conditions, and background light interference, and cannot form objective and reproducible data.

[0003] 2. Stringent conditions: It requires finding a sufficiently long open body of water or site free from light pollution in a dark environment, which is difficult and costly to implement.

[0004] 3. Inability to quantify and trace the source: It can only give a qualitative conclusion of "visible" or "invisible", and cannot accurately measure the light intensity or directly compare it with the light intensity value required by the standard. It lacks scientific data support.

[0005] 4. Safety risks exist: Nighttime maritime inspection operations pose certain safety risks to both personnel and vessels. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for inspecting the visible light distance of ship navigation signal lights, which addresses the shortcomings of the existing technology. This method solves the problems of the existing inspection methods for the visible light distance of signal lights being highly subjective, difficult to implement, unable to be quantified and traced, and posing safety risks.

[0007] The present invention discloses a method for testing the visible light distance of ship navigation signal lights, the method comprising: S11: Measure the absolute spectral radiance and spatial luminous intensity distribution of the traffic lights; S12: Set the standard observer visual function, and calculate the reference luminous intensity based on the absolute spectral radiance and the standard observer visual function; S13: Set the illuminance threshold at the observer's eye, and calculate the visible distance under atmospheric conditions based on the illuminance threshold at the observer's eye and the reference luminous intensity; S14: Set the minimum visible distance of the traffic light standard, compare the visible distance under the atmospheric conditions with the minimum visible distance of the traffic light standard, and if the visible distance under the atmospheric conditions is greater than or equal to the minimum visible distance of the traffic light standard, then the visible light distance of the traffic light is qualified; if the visible distance under the atmospheric conditions is less than the minimum visible distance of the traffic light standard, then the visible light distance of the traffic light is unqualified.

[0008] As a further improvement, in S11, the method for measuring the absolute spectral radiance of the traffic light is to use a spectroradiometer to measure the spectral power distribution of the traffic light at a standard distance directly in front of the traffic light, and the spectroradiometer outputs the color coordinates and radiant intensity of each wavelength corresponding to the spectral power distribution of the traffic light. The color coordinates are compared with the color gamut range specified by COLREGs. When the color coordinates are within the color gamut range specified by COLREGs, the radiation intensity of each wavelength is recorded as the absolute spectral radiance of the signal light.

[0009] Furthermore, in S11, the method for measuring the spatial light intensity distribution of the signal light is as follows: A distributed photometer is used to measure the light intensity of the traffic lights. The distributed photometer measures the light intensity distribution of the traffic lights in preset horizontal and vertical arc segments. A reference light intensity Ib is obtained from the light intensity distribution map, and the reference light intensity Ib is used as the spatial light intensity distribution of the traffic lights.

[0010] Furthermore, in S12, the expression for calculating the reference luminous intensity based on the absolute spectral radiance and the standard observer's visual function is as follows: ; in, L(λ) For spectral radiance, V(λ) For the standard observer's visual function, I(λ) This represents the visible distance under atmospheric conditions.

[0011] Furthermore, in S13, the expression for calculating the visible distance under the aforementioned atmospheric conditions is: ; in, d Visible distance under atmospheric conditions. E It is the illuminance threshold at the observer's eye. I The reference luminous intensity, t Atmospheric transmittance.

[0012] Furthermore, the minimum visible distance of the signal lights is specified according to the requirements of COLREGs or national classification society standards for such signal lights.

[0013] Furthermore, after verifying the visible light distance of the traffic lights, a structured inspection report is automatically generated based on the inspection results.

[0014] Beneficial effects The advantages of this invention are: 1. This invention provides a method for testing the visible light distance of ship navigation signal lights. The method involves measuring the absolute spectral radiance and spatial light intensity distribution of the signal light; setting a standard observer visual function and calculating a baseline luminous intensity based on the absolute spectral radiance and the standard observer visual function; setting an illuminance threshold at the observer's eye and calculating the visible distance under atmospheric conditions based on the illuminance threshold at the observer's eye and the baseline luminous intensity; setting a minimum visible distance for the signal light and comparing the visible distance under atmospheric conditions with the minimum visible distance for the signal light to obtain the test result; utilizing precision photoelectric instruments to replace the human eye, achieving objectivity, digitization, and quantification of the test results, greatly improving the accuracy and credibility of the test; enabling accurate prediction of the visible distance under standard conditions (nighttime, long distance) in non-standard environments (such as daytime, short distance), breaking the time and space limitations of the test; simultaneously completing the test of multiple key parameters such as signal light intensity, color, and horizontal arc, with efficiency far exceeding traditional itemized tests; avoiding high-risk, high-cost long-distance nighttime sea trials, allowing the test work to be completed quickly in shipyard docks or workshops, significantly improving test efficiency and reducing safety and cost risks.

[0015] 2. After inspecting the visible light distance of the signal lights, the present invention automatically generates a structured inspection report based on the inspection results, which can provide a valuable data foundation for the monitoring of the signal light status, life prediction and preventive maintenance of ships. Attached Figure Description

[0016] Figure 1 This is a flowchart of the method for testing the visible light distance of ship navigation signal lights according to the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. See Figure 1 The present invention provides a method for testing the visible light distance of ship navigation signal lights. Step 1: Optical parameter measurement (data acquisition) Specialized equipment was used to measure the traffic lights at close range to obtain the following key data: Absolute spectral radiance / illuminance: Using a spectroradiometer, measure the spectral power distribution of the light source at a standard distance (e.g., 5 or 10 meters) directly in front of the luminaire. Pay particular attention to measuring the color coordinates (x, y) to ensure the color conforms to the color gamut specified by COLREGs, and record the radiant intensity at each wavelength.

[0018] Spatial light intensity distribution: Using a light distribution curve detection system (such as a distributed photometer), measure the light intensity distribution of the traffic light within the entire specified horizontal and vertical arc segments to find its reference light intensity Ib (i.e., the value in the direction of maximum light intensity).

[0019] Step 2: Calculation of baseline luminous intensity Based on the spectral data obtained in the first step, and combined with the standard observer visual function specified by the International Commission on Illumination (CIE), V(λ) Calculate the reference luminous intensity of the traffic lights. I(λ) The calculation formula is: ; in, L(λ) This represents the measured spectral radiance. This calculation takes into account the visual sensitivity of the human eye, and the result is equivalent to the "effective luminous intensity" perceived by the human eye.

[0020] Step 3: Calculation of Atmospheric Transmission and Visible Distance Atmospheric projection formula is ,in, d Visible distance under atmospheric conditions. E It is the illuminance threshold at the observer's eye. I As the reference luminous intensity, s "This is the atmospheric extinction coefficient (at a standard meteorological optical range MOR = 13.5 nautical miles)." s ≈ 0.274 / n mile). Then according to... Formulas derived from the basic atmospheric projection formula ;in, t To find the atmospheric transmittance, we then transform the formula and solve it inversely to obtain... d The transformed formula can be obtained. .

[0021] By combining precise laboratory measurements with the established atmospheric transmission law (Allard's law), accurate prediction of visible distance under standard conditions (nighttime, long distance) was achieved in non-standard environments (such as daytime, short distance), breaking the temporal and spatial limitations of testing.

[0022] Step 4: Conformity Assessment The calculated visible light distance dCompare the minimum visibility distance required for this type of signal light with that specified in COLREGs or classification society standards (e.g., 6 nautical miles, 3 nautical miles, etc.).

[0023] If "d ≥ d_standard", then the visible light distance of the traffic light is deemed acceptable; otherwise, it is deemed unacceptable.

[0024] Step 5: Generate the inspection report The system automatically generates structured inspection reports, including: measured environmental parameters, signal light model, measured spectral data graphs, light intensity distribution graphs, calculated baseline light intensity values, calculated visible distances, and conclusions. All data is traceable, forming a digital archive. This provides a data foundation for intelligent operation and maintenance: the generated digital reports offer valuable data for ship signal light status monitoring, lifespan prediction, and preventative maintenance.

[0025] This invention shifts from "subjective judgment" to "objective measurement": by using precision photoelectric instruments to replace the human eye, it achieves objectivity, digitization, and quantification of inspection results, greatly improving the accuracy and credibility of inspections. It can simultaneously inspect multiple key parameters such as signal light intensity, color, and horizontal light arc, with efficiency far exceeding that of traditional itemized inspections. This avoids high-risk, high-cost long-distance nighttime sea trials, and the inspection work can be completed quickly in shipyard docks or workshops, significantly improving inspection efficiency and reducing safety and cost risks.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method of testing the visible light range of a ship's navigation light, characterized in that, The inspection method comprises: S11: measuring the absolute spectral radiance of the signal light; S12: setting a standard observer visual function, and calculating a reference luminous intensity according to the absolute spectral radiance and the standard observer visual function; S13: setting an illuminance threshold at an observer's eye, and calculating a visible distance under atmospheric conditions according to the illuminance threshold at the observer's eye and the reference luminous intensity; S14: setting a signal light specification minimum visible distance, comparing the visible distance under atmospheric conditions with the signal light specification minimum visible distance, and when the visible distance under atmospheric conditions is greater than or equal to the signal light specification minimum visible distance, the visible light distance of the signal light is qualified; when the visible distance under atmospheric conditions is less than the signal light specification minimum visible distance, the visible light distance of the signal light is unqualified.

2. A method of testing the visible light range of a ship's navigation light according to claim 1, characterized in that, In S11, the method for measuring the absolute spectral radiance of the signal light is that a spectral radiometer is used to measure the spectral power distribution of the signal light at a standard distance in front of the signal light, and the spectral radiometer outputs color coordinates corresponding to the spectral power distribution of the signal light and radiation intensity of each wavelength; The color coordinates are compared with a color gamut range according to COLREGs, and when the color coordinates are within the color gamut range according to COLREGs, the radiation intensity of each wavelength is recorded as the absolute spectral radiance of the signal light.

3. A method of testing the visible light range of a ship's navigation light according to claim 1, wherein, In S12, the expression for calculating the reference luminous intensity according to the absolute spectral radiance and the standard observer visual function is: ； wherein L(λ) is the spectral radiance, V(λ) is the standard observer visual function, I(λ) is the visible distance under atmospheric conditions.

4. A method of testing the visible light range of a ship's navigation light according to claim 1, wherein, In S13, the expression for calculating the visible distance under atmospheric conditions is: ； wherein, d is the visible range under atmospheric conditions, E is the luminance threshold at the observer's eye, I is the reference luminous intensity, τ is the atmospheric transmittance.

5. A method of testing the visible light range of a ship's navigation light according to claim 1, wherein, The signal light specification minimum visible distance is calibrated according to the requirements of COLREGs or ship classification societies for the signal light.

6. A method of testing the visible light range of a ship's navigation light according to claim 1, wherein, After the visible light distance of the signal light is inspected, a structured inspection report is automatically generated according to the inspection result.

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