Research On The Illumination Distribution Model And Application Of Fishing Lamp Based On Monte Carlo Method

In 2000,the fuel consumption of fishing fisheries in the world was 5×10¹⁰ L,accounting for 1.2%of the global fuel consumption.For some light induced fisheries using fishing lamps,the fuel cost of fishing lamps accounts for 40%～60%of the total fishing cost.Light trapping fishing is a kind of operation method that uses the phototaxis of fish to trap fish around the fishing vessel for fishing.It has the characteristics of simple operation and high efficiency,and is widely used in China’s offshore and pelagic waters.The common light induced fisheries are light purse seine,light squid jigging,light lift net and so on.Fishing lamps is an important equipment of light trapping fishery,which plays the role of trapping and collecting fish.The optical characteristics of fishing lamps and the light configuration of fishing vessel directly affect the light intensity distribution around the fishing vessel,and then affect the trapping effect and fishing ground.Most of the traditional fishing lamps use metal halide lamps.This kind of lamp has some problems,such as high energy consumption,high voltage start-up,high calorific value,and the ultraviolet radiation has a great impact on the skin of the crew.Therefore,relevant researchers actively explore new light sources to replace metal halide lamps.LED fishing lamps have the advantages of low energy consumption,strong directivity,strong penetration,and adjustable spectral region The relevant experiments and application research are also actively promoted.In addition to exploring the design and performance of LED fishing lamps itself,it is also very important to calculate and analyze the light intensity distribution around the fishing vessel.There are several methods about the model of illuminance distribution in water,such as point light source,superposition method,experience method and so on.According to the statistical results of the random collision between photons and aerosol particles in the atmospheric medium,the Monte Carlo method is used to establish the illumination distribution model in water,which provides theoretical support for the promotion and use of LED fishing lamps.The results show that the slope coefficient of linear fitting between the theoretical value and the measured value is close to 1（P<0.05）,and the reliability of the model is high.At the same time,compared with point light source,superposition method and empirical method,the model was used to calculate the illuminance in water.The results show that the correlation coefficient r _MC>r _S>r_p>r _L,the Monte Carlo method has significant correlation with superposition method（P<0.05）,and the Monte Carlo method has the best corresponding relationship compared with other models.The model also explores the influence of different wind speed and relative humidity on the sea surface illumination.The results show that the illumination first increases and then decreases with the increase of the distance from the ship’s midship line;when the relative humidity is constant,with the increase of the distance from the ship’s midship line,the illumination first increases with the increase of wind speed and then decreases with the increase of wind speed;when the wind speed is constant,the influence of relative humidity on the sea surface illumination is significant The effect is small.In the specific application,according to the ship parameters,fishing lamp parameter configuration,wind speed and chlorophyll concentration data of“Zhedaiyu 13461”,combined with the light distribution curve and spectral distribution data of 300W flat LED fishing lamp,the paper calculates the different power,installation angle and lamp height configuration of the above led fishing lamp by using Monte Carlo model In addition,the reasonable configuration of fishing vessel lighting is explored.Research shows:1)When the total power of fishing vessel s is 18 k W,27 k W and 36 k W,the maximum trapping volume,trapping distance and trapping depth increase with the increase of power.To a certain extent,the increase of power is conducive to fish trapping,but with the increase of power,the maximum effective trapping water body and trapping distance increase and the amplitude decreases.2)When the installation angle is 45°,60°and 75°,the maximum effective trapping volume and trapping distance increase significantly,and the trapping depth decreases with the increase of angle;when the distance between the lamp and the water surface is5,6 and 7m,the maximum effective trapping volume and trapping distance increase with the increase of lamp height,and the trapping depth does not change significantly.3)The total power of LED fishing lamps is 36 k W,the lamp height is 6～7 m,and the installation angle is 60°to 75°,which is more suitable for squid and mackerel fishing.4)Using Monte Carlo model to analyze the changes of spectral distribution in water,it is found that the attenuation of long wave is faster than that of short wave,while the band with relative sensitivity of squid and chub mackerel more than 50%is distributed in the short wave region.The flat LED fishing lamps in this study is conducive to the trapping of squid and chub mackerel.