The study of the fish-collecting lamp needs to observe the effect of light radiation from the fish-eye, so the lighting metric is not suitable for the 5000w fishing lamp, the main reason is that the measurement accuracy cannot be met, and the second reason is that the lighting index can not reflect the authenticity of the light receptor sensitivity.
There are no norms and standards for the spectral technology of fish collecting lamps in all countries in the world. Some foreign research institutions have studied the mechanism of fishing lamps involving the concept of photon and dark vision, but photometric labeling is still used in the measurement of light radiation of underwater fishing lamps, such as light intensity, luminous flux, color temperature and illuminance to evaluate the performance of fishing lamps.
The phototaxis caused by the wavelength of fish is determined by the photon energy. If the amount of photon energy enters the retina of the fish eye is too much, the positive phototaxis will immediately turn to negative phototaxis, because the lens of the human eye can be adjusted to adapt to the light radiation energy, and the lens of fish is not elastic and cannot be adjusted. The action response of fish is much faster than that of people, and the instinctive reaction is to flee.
I have done research on aquaculture lamps for industrial aquaculture of fish before, which is to induce rapid growth of fish and disinfection of water quality. We use the light quantum measurement system. In terms of inducing fish in industrial aquaculture, our research mechanism is the same as that of collecting fish lamps.
The fish collecting lamp is divided into the above water and the underwater fish collecting lamp. The above water fish collecting lamp involves the radiation range and the amount of light effectively entering the water, and the radiation range involves the geometric optics category. The geometric optics needs to solve what kind of light distribution curve is required for the equivalent plane of the water surface. Underwater fishing lamps involve radiation volume and radiation distance, both of which are related to the scattering and turbidity of seawater and the light quality, light quantity and light distribution of the light source.
The speed of light propagation in different media is not the same, but the photon energy will not change, this principle will lead to the propagation of light radiation in the sea water, the wavelength of the photon changes, the transmission of light radiation in the sea water is usually the wavelength blue shift, the selection of the wavelength of the fish lamp needs to consider this factor, in addition, the water quality is different, the distance of light radiation propagation of different wavelengths is greatly affected. The turbidity of seawater produces a barrier to optical radiation that is a matter of absorption and reflection, but does not affect the wavelength change.
The expression of light radiation of different wavelengths requires color coordinates to define light color in CIE1931 chrominance diagram, in addition, light radiation with a wavelength greater than 570nm is quickly absorbed by seawater into heat, so light radiation greater than this wavelength in seawater propagation distance is limited, and ultraviolet, blue, green radiation distance is much farther, in a certain depth of seawater, the lower the white light color temperature, The greater the light radiation is absorbed.
The concept of wave is used for the distance of light radiation in seawater, and the wavelength size is the main reason for scattering, while the concept of light quantum is used for the positive phototaxis of fish. When the number of light quantum entering the fish eye reaches a certain value, the fish has a visual response.
Lighting distribution problem
The light distribution of the lamp is a secondary optical design, expressed by the light distribution curve, the fishing boat in the vertical axis of the center of gravity is constantly moving up and down and swinging, the Lambert type light distribution of the gold halogen lamp has the advantage of uniformity in the amount of light radiation into the water, but the vertical direction will have 25% of the light can not shine on the water surface, LED fishing light can use optical modules to solve this problem. However, the optical module needs to consider the efficiency of the optical lens, otherwise it will not be worth the loss.
Stroboscopic problem with the drive
Stroboscopic time interval response is related to the species of fish, usually between 0.012-0.07 seconds there is a response, but stroboscopic effect of light radiation energy output value, there are few studies at home and abroad, this research needs further laboratory verification. ocean fishing lamp measurement problem
Most of the measurements can meet the accuracy and error requirements, usually rarely consider whether the measurement is accurate, but for the measurement of optical radiation, the measurement error and accuracy must be evaluated, about the spectral measurement error can refer to the previous wechat public number article, we need to establish a concept, that is, if the basic parameter measurement error of the fish lamp is not evaluated, The parameter value directly affects the application effect of the fish-collecting lamp.
The measurement of the geometric optical and spectral parameters of the fish collecting lamp is very strict, which involves whether the fish collecting performance and energy saving indicators of the fish collecting lamp are evaluable and comparable. Without the participation of professional measurement technology, the measurement of the fish collecting lamp is unreliable and inaccurate, especially the measurement of underwater optical parameters.
Measurement error and accuracy is the most controversial issue in spectral technology, because optical instruments are calibration systems, system error itself exists, different instruments measure the same light source, often the error is relatively large.
The measurement of fish lamp is a basic science, usually to carry out two parts of measurement: one is laboratory measurement, the other is field measurement, laboratory measurement is the theoretical basis, irreplaceable, field measurement is the verification of laboratory measurement, is the evaluation basis, both of these measurements require professional technical participation.
The measurement problem of the fish lamp goes back to the basic problem of the evaluation of the spectral parameters of the fish lamp. Any kind of light source needs to be evaluated by physical units of measurement. The lamp uses photometry and colorimetry units, and the plant lamp uses light quantum units. It is the parameter dimension that causes the high sensitivity of fish to light radiation, and this sensitivity determines positive and negative phototaxis.
Collecting lamp and fishing effect problem
The purpose of this fishing tool is to solve the fishing efficiency and reduce fuel consumption. The fishing lamp manufacturing enterprises must first meet the technical requirements to ensure the effective fishing performance of the fishing lamp, do a good job in the quality indicators and services of the fishing lamp, and cannot transfer their responsibilities to the fishing art. The fishing lamp is a cross-border product of the discipline, and the performance is evaluated by different professions. The application effect of fishing lamps has a lot to do with fishing technology, and enterprises need to objectively distinguish their product responsibilities.
fishing lamp technical standard problem
Technical standards are the performance of measuring the level of industrial development, is the specification of comprehensive technology application, any kind of advanced products are based on advanced technology, and advanced technology is based on advanced basic technology, technical standards are the performance of this advanced nature, there is no technical standards of industry and products is a considerable blindness, can not guarantee the right direction of development.
LED fish light does not belong to the category of lighting, the use of lighting thinking to do fish light is often a factor that leads to failure, contempt for technology and rely on feeling to do products lead to fish light trial and error cost is very high, LED fish light performance experiment work currently there are systemic problems, which is also the technical incomplete performance of fish light. In essence, there is no application standard for the technology, and there is a lack of professional laboratory evaluation rules.
From the technical research of various countries, LED underwater light is the inevitable direction of development, we have translated four representative technical articles, the purpose is to cause enterprises and scientific research institutions to pay attention to the current technical specifications of fishing lamp.
(To be continued…..)
Post time: Oct-05-2023