CN103966086A - Internal and external hierarchically-adjusted and controlled light source system capable of adjusting and controlling light intensity and adjusting light color - Google Patents

Abstract

The invention relates to an internal and external graded control light source system with adjustable light intensity and adjustable light color, which comprises an LED lamp tube group, a reaction tank body, a reaction tank upper cover, a light intensity controller, an illumination sensor group, a reaction tank bracket and a transparent The glass tube, the transparent glass tube is fixed at the middle position of the upper cover of the reaction tank, the upper cover of the reaction tank is provided with an outlet for the light sensor, the bracket of the reaction tank is fixed at the bottom of the reaction tank, and the The LED lamp tube group is connected with an external light intensity controller, and the light sensor is installed in the middle of the transparent tube in the reaction tank and the outer wall of the reaction tank, and the light intensity controller and the light sensor pass the data from the outlet of the light sensor line connection. The invention has the advantages of making the operation of the bait microalgae reactor more convenient for users; the light source equipment is suitable for reactors with different diameters and the spectral requirements of algae cultivation; the light intensity control can provide reliable and accurate measurement parameters.

Description

An internal and external hierarchical control light source system with adjustable light intensity and adjustable light color

【Technical field】

The invention relates to the field of micro-environment monitoring for fish farming, in particular to an internal and external graded control light source system with adjustable light intensity and adjustable light color.

【Background technique】

In the existing technology in the field of microenvironment monitoring for fishery microalgae cultivation, there are the following defects:

1. Some bait microalgae photobioreactors only use natural light as the light source of the system. When the microalgae grows to a certain stage, the density of microalgae cells increases, and the mutual occlusion of the microalgae cells themselves makes the light in the central area of the microalgae photobioreactor The strength becomes very weak, and it is difficult to meet the needs of the rapid growth of microalgae.

2. Some bait microalgae photobioreactors use natural light as the external light source, supplemented by a single lamp tube as the built-in light source. A single lamp tube is installed inside the reaction tank as the internal light source. Although the system achieves the effect of increasing the light intensity by installing a built-in light source, it is still difficult to achieve the optimal light intensity for the growth of bait microalgae when the natural light outside the reaction tank is weak. .

3. Some bait microalgae photobioreactors use natural light as the external light source, and multiple lamp tubes are installed and deployed inside the reaction tank as the internal light source. This light source design improves the lighting effect, but it will make the reaction The internal structure of the tank is too complicated, which affects the circulation of the culture solution inside the tank, and at night because there is no external light source, the lighting effect is not good.

4. Most photobioreactors use fluorescent tubes, which are easily broken, not only difficult to install and maintain, but also generate a lot of heat, which is not suitable for temperature control and low energy conversion efficiency.

5. Some photobioreactors use LED lamps, but the number of lamps is fixed, the light color is fixed, and the light intensity and spectral range that can be provided cannot be adjusted. It is only suitable for cultivating fixed types of algae, while most algae are cultivated A combination of blue light and white light works better.

The light source design of the existing bait microalgae photobioreactor has insufficient adjustability, and cannot dynamically provide the best light intensity with the different culture stages of microalgae cells, nor can it provide the best spectrum with the change of microalgae species lighting effects. Because for different types of microalgae under the same light intensity conditions, the influence of monochromatic light source on the growth efficiency of microalgae is not the same; in addition, during the growth of microalgae, the light transmittance in the reaction tank is nonlinear However, the light value provided by the existing light source design system is fixed and the light color is fixed. It cannot dynamically adjust the light intensity and spectral range according to the change of the concentration of microalgae cells in the reaction tank, so as to provide enough light and suitable for the cells in the reaction tank. The spectrum of photosynthetic reactions of different algae species makes the yield increase of microalgae culture relatively low, and the photoconversion efficiency is low.

Chinese patent document CN101724547A discloses a method and device for microalgae cultivation experiments using LED adjustable light. However, it cannot dynamically adjust the light intensity and spectral range according to the change of the concentration of microalgae cells in the reaction tank. At present, there is no relevant report on a device or method that can automatically adjust light color and light intensity, and dynamically adjust light intensity and spectral range to reflect changes in the concentration of microalgae cells in the tank.

【Content of invention】

The object of the present invention is to address the deficiencies in the prior art and provide an internal and external graded controllable light source system with adjustable light intensity and adjustable light color.

For realizing above-mentioned object, the technical scheme that the present invention takes is:

An internal and external hierarchical control light source system with adjustable light intensity and adjustable light color, including LED lamp tube group, reaction tank body, reaction tank top cover, reaction tank support and transparent glass tube. On the reaction tank, the transparent glass tube is fixed in the middle of the upper cover of the reaction tank, the support of the reaction tank is fixed at the bottom of the reaction tank, and the LED light tube is installed on the support of the reaction tank and the reaction tank The internal transparent glass tube also includes a light intensity controller and a light sensor group. The light sensor is installed in the middle of the transparent tube in the reaction tank and the outer wall of the reaction tank. The light intensity controller and the light sensor pass through The data line of the light sensor outlet on the upper cover of the reaction tank is connected, and the light intensity controller is connected with each lamp tube.

The light sensor group is two light intensity sensors installed back to back at the same position.

The reaction tank support is a telescopic structure.

There are 5 LED lamp tubes in total, one of which is installed in the transparent glass tube inside the reaction tank, and the other four are installed on the support of the reaction tank, and are fixed in the front, rear, left, and right directions of the reaction tank.

The illumination sensor group adopts a multi-sensor data fusion algorithm.

The light intensity controller adopts a fuzzy logic light intensity graded control method.

The advantages of the present invention are:

1. The design method of light source equipment with internal and external adjustable light intensity can be adopted. The number of built-in lamps is 1, which reduces the number of lamps in the barrel and optimizes the structure of the reaction barrel. The operation is more convenient, and the cleaning of the reaction barrel is also more convenient. The light source adopts LED lamp tube, the distance between the lamp tube and the reaction tank is adjustable, and the light color of the LED lamp tube is adjustable, so that the light source equipment is suitable for reactors with different diameters and the spectral requirements of different algae cultivation.

2. Using multi-sensor measurement and sensor data fusion methods to measure and calculate the light intensity value in the reaction tank, to provide reliable and accurate measurement parameters for light intensity control.

3. Using fuzzy logic light intensity graded control method, it can dynamically control the on and off of the internal and external light sources in each group according to the growth status of the microalgae in the reaction tank and the amount of light required during the microalgae cultivation process, which improves the accuracy of light control and makes the microalgae The growth of algae can always obtain better light conditions, which in turn makes the culture yield of microalgae higher, which greatly promotes the development of microalgae farming and fine fishery.

【Description of drawings】

Accompanying drawing 1 is a structural representation of the present invention.

Accompanying drawing 2 is the working flow chart of light intensity controller.

Accompanying drawing 3 is a block diagram of fuzzy logic light intensity graded control method.

Accompanying drawing 4 is the process of cultivating bait microalgae in a photobioreactor with internal and external graded control light sources.

Table 1 is the experimental data table of Hymenopsis subcordiformis as an example.

【Detailed ways】

The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

The reference signs and components involved in the accompanying drawings are as follows:

1. Light intensity controller 2. Light sensor group

3. LED lamp group 4. Reaction tank support

5. Reactor body 6. Transparent glass tube

7. Reaction tank cover 8. Light sensor outlet

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of an internal and external hierarchically adjustable light source system with adjustable light intensity and adjustable light color according to the present invention. The internal and external light source system includes a reaction tank body 5 , a reaction tank cover 7 , a reaction tank support 4 , an LED lamp tube group 3 , a light intensity controller 1 , an illumination sensor group 2 and a transparent glass tube 6 . The reaction tank upper cover 7 is covered on the reaction tank body 5, and the transparent glass tube 6 is fixed at the middle position of the reaction tank upper cover 7 . The upper cover 7 of the reaction tank is provided with a light sensor outlet 8 . The reaction tank support 4 is fixed on the bottom of the reaction tank body 5, and the reaction tank support 8 is a telescopic structure, which can adjust the telescopic length of the bottom. The LED lamp tube group 3 has 5 LED lamp tubes in total, one of which is installed in the transparent glass tube 6 connected to the upper cover 7 of the reaction tank, and the other LED lamp tubes are installed on the bracket 4 of the reaction tank, It is fixed in the front, back, left, and right directions of the reaction tank, and each lamp tube is connected with an external light intensity controller 1 . The light sensor group 2 is light measuring equipment, which is installed in the intermediate position between the transparent tube 6 and the outer wall of the reaction tank in the reaction tank. The light intensity controller 1 is connected with the light sensor group 2 through the data line through the light sensor outlet 8 .

It should be noted that the LED lamp is a linear LED lamp with a power of 25w, which can provide 4000-5000 lux light intensity on the surface of the reaction tank, and the light color of the LED lamp can be adjusted accordingly with the cultured algae. The data measured by the light sensor is transmitted to the light intensity controller through the data line through the outlet of the light measurement device, and the light intensity controller controls the light intensity of the light source device. The four light tubes on the outside are installed on the protruding part of the bottom bracket of the tank, and the length of this part can be adjusted. Therefore, this set of light source equipment can be placed on reaction tanks with different inner diameters to provide light sources for various photoreactors.

The choice of LED lights in light source equipment, different LED light sources have different effects on the growth efficiency of microalgae. For most algae species, under the same light intensity, the order of the effect of monochromatic light source on the growth efficiency of microalgae Yes: Blue LED>Red LED>Green LED. Effects of different light source combinations on the growth rate of P. subcordiformis: red light + blue LED > green + blue LED > red + blue + green LED > red + green LED; The influence of the growth rate of algae: red light + blue light + green light LED > green light + blue light LED > red light + blue light LED > red light + green light LED. Therefore, LED lights with different light colors can be used according to different algae species, and the spectral range can be changed to provide more optimal light sources for different algae species.

This structural layout design method can not only provide optimal light sources for various photoreactors, but also reduce the number of lamp tubes in the tank and optimize the structure of the reaction tank.

Please refer to Fig. 2, Fig. 2 shows the working flow diagram of the light intensity controller. The light intensity controller is composed of fuzzy logic internal and external graded control LED lamp tube group, light sensor group, power supply module, microprocessor, isolation protection device, fuzzy logic light intensity graded control system, multi-sensor data acquisition system, light intensity Control fuzzy algorithm, multi-sensor data fusion algorithm. The multi-sensor data acquisition system is connected to the microprocessor, and the signal detected by the illumination sensor group (a group of illumination sensors installed back to back at the same position) is sent to the microprocessor, and the microprocessor uses the light intensity control fuzzy algorithm, multi-sensor After the data fusion algorithm calculates the data, the calculation result is sent to the fuzzy logic light intensity classification control system, and the control system controls the different working states of the fuzzy logic internal and external hierarchical control LED lighting groups.

It should be noted that in this design, the working status of the lighting equipment is divided into the following four types, so that the light intensity can be adjusted in stages. All the lamps are turned off as the working status 0, and the built-in lamps are turned on separately as the working status 1, and then turned on Two light tubes on any diagonal line of the external light source are in working state 2, and all light tubes are turned on in working state 3.

(1) Multi-sensor data fusion algorithm for light intensity measurement:

The sensor of the photoreactor is installed in the middle between the center of the reactor and the outer wall of the reactor, because the sensing angle of the photosensitive device on the sensor cannot realize the simultaneous sensing of the illuminance on both sides of the reactor, so in the same position Install a set of illuminance sensors back to back.

When using sensors to collect data, it is necessary to conduct a comprehensive analysis of the internal noise and environmental interference of the sensor. Longitudinal analysis: for the analysis of multiple sampling results of a sensor, with a single sensor as the research object, the measurement variance is a comprehensive attribute of the internal noise and environmental interference of the sensor, which always exists in the whole process of measurement, and an accidental Interference may cause large errors in the final results. Horizontal analysis: In horizontal analysis, the measurement information of multiple sensors at a certain sampling time is used.

When multiple sensors are used for sampling, due to the different orientations of the sensors, when calculating the illuminance of the location, the weight of the measurement results of each sensor is also different. The volume ratio of the culture solution in the reactor measured by a group of two illuminance sensors facing the inner and outer sides is 1:3, so the weights of the data collected by the inner and outer direction sensors are set to 0.25 and 0.75.

The multi-sensor fusion algorithm is as follows: Indicates the result of the nth sampling of the i-th sensor within a short period of time, where the maximum value is , the minimum value is , then each sensor measures the arithmetic mean value during n consecutive samplings for:

Then the illuminance measured by the back-to-back group A sensors installed at the same position is:

In the formula Indicates the arithmetic mean of sensor measurements with a position facing outwards, Indicates the arithmetic mean of sensor measurements at a position towards the inside.

(2) Fuzzy logic light intensity classification control method

Please refer to FIG. 3 , which is a block diagram of the fuzzy logic light intensity level control method.

The fuzzy logic light intensity classification control method and strategy are as follows: divide all the lamp switches in the light source equipment of the entire lighting system into four working states, place two light sensors back to back at the middle position between the center of the reaction tank and the side wall, and the sensors collect After being processed by the D/A conversion circuit, the illuminance value in the tank is obtained by the above-mentioned multi-sensor fusion algorithm, and the algae cell concentration is calculated at the same time, which is used as the input variable of the fuzzy inference controller, and then this input is standardized Processing, mapping its range of change to the response domain, establishing the correspondence between clear and fuzzy quantities through membership functions, and determining the linguistic values corresponding to the input values of linguistic variables as the input of fuzzy control reasoning. The fuzzy control reasoning is based on the rule base and input variables, and the fuzzy results of the graded light source equipment are obtained through fuzzy reasoning, and the graded regulation of the light intensity is realized by controlling the working state of the light source device. The rule base is obtained according to the light demand model of the bait microalgae cultivation process and the cell density change model in the reaction tank.

At the initial stage of microalgae cultivation, the concentration of microalgae in the reaction tank is low, and the external natural light can meet the needs of rapid cultivation of microalgae, and the lighting equipment is in the working state of 0 (that is, all lamps are turned off); The light conditions near the center of the reaction tank become worse. The light intensity control system analyzes the collected light data through fuzzy logic to obtain the fuzzy results and the lower limit value of the light range that is most suitable for the growth of microalgae. (of different algal species Values are different), once the fuzzy result exceeds the lower limit, the lighting device will enter working state 1 (that is, only the built-in lamp is turned on), that is, the LED lamp group with the weakest illuminance, and an LED light at the center will be turned on. The fuzzy logic light intensity classification control will set the light color of the LED light according to the algae rule library, so that the light conditions in the reaction tank are in the most suitable spectral range for growth, and at the same time continuously adjust the linear LED light according to the change of the concentration of microalgae light intensity. Adopt the same control strategy to control when to enter working state 2 (turn on the built-in light tube and turn on two light tubes on any diagonal of the external light source at the same time) and work state 3 (turn on all the light tubes).

Compared with the traditional simple control method, this regulation method can control the light conditions more accurately, and can dynamically adjust the light intensity according to the growth needs of bait microalgae, the growth process of algae cells and the changes of external natural light.

Please refer to Figure 4, which shows the process of cultivating microalgae as food in a photobioreactor with internal and external graded light sources. For bait microalgae cultivation, the reaction tank first needs to be cleaned to remove the residual microalgae from the previous cultivation to prevent the residue from polluting this cultivation; then adjust the light intensity and chromaticity of the LED lamp to the most suitable The range of microalgae growth; after the preparations are done, add microalgae species, set the controller to the automatic control state, and the photoreactor will enter the automatic cultivation stage. The control system will collect the real-time The cell concentration value, according to the multi-sensor measurement and data fusion fuzzy logic light intensity graded regulation method, grades and regulates the working status of the LED lamp group, so that the whole cultivation process of microalgae is always under good light conditions; at the same time, the control system also according to the collected The obtained algae cell concentration value is used to judge whether the concentration K that is most suitable for harvesting has been reached. Once the target concentration value is reached, the microalgae will be harvested and enter the next cultivation stage, otherwise continue this cultivation.

Example 1

Algae species: subcardioid flat algae

Best light intensity range: 5000-1000lux

The real-time data collected in the experiment is shown in Table 1:

It can be seen from the above table that the fuzzy logic light intensity control method using multi-sensor measurement and data fusion can monitor and adjust the light intensity in real time, so that the microalgae are always under the optimal light intensity, which greatly improves the cultivation efficiency.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the method of the present invention, some improvements and supplements can also be made, and these improvements and supplements should also be considered Be the protection scope of the present invention.

Claims (6)

1. one kind can regulate and control the interior external classification regulation and control light-source system of light intensity light color adjustable, comprise LED light tube group, reacting tank body, retort upper cover, retort support and transparent glass tube, described retort upper cover covers on reacting tank body, described transparent glass tube is fixed on position, retort upper cover middle, described retort support is fixed on reacting tank body bottom, described LED fluorescent tube is arranged on the support of retort and in the transparent glass tube of retort inside, it is characterized in that, also comprise light intensity control and optical sensor group, described optical sensor is arranged on the mid-way of transparent tube and retort outer wall in retort, described light intensity control is connected by the data line of the optical sensor outlet via retort upper cover with optical sensor, described light intensity control is connected with every fluorescent tube.

According to claim 1 regulate and control the interior external classification regulation and control light-source system of light intensity light color adjustable, it is characterized in that, described optical sensor group is 2 illuminance sensors that same position is installed back-to-back.

According to claim 1 regulate and control the interior external classification regulation and control light-source system of light intensity light color adjustable, it is characterized in that, described retort support is Collapsible structure.

According to claim 1 regulate and control the interior external classification regulation and control light-source system of light intensity light color adjustable, it is characterized in that, totally 5 of described LED fluorescent tubes, in the transparent glass tube that wherein is arranged on retort inside, all the other four are arranged on the upper of retort support, are fixed on the four direction all around of retort.

5. according to the interior external classification regulation and control light-source system of the regulated and controled light intensity light color adjustable described in claim 1-3, it is characterized in that, described optical sensor group adopts Multisensor Data Fusion Algorithm.

6. according to the interior external classification regulation and control light-source system of the regulated and controled light intensity light color adjustable described in claim 1-3, it is characterized in that, described light intensity control adopts fuzzy logic light intensity classification regulate and control method.