CN104100873A - Full-spectrum LED solar simulator - Google Patents

Abstract

The invention discloses a full-spectrum LED solar simulator, wherein a Fresnel lens, a light source chamber, a circuit control chamber and a radiator unit are sequentially connected in an integrated cylinder body; LED lamp beads with various wave lengths are connected in parallel to constitute an LED lamp bead array, a current-limiting resistor is connected to each LED lamp bead branch in series, and the power of the lamp beads is controlled by a control chip on a primary circuit; the most suitable arrangement of the solar simulation lamp array and the most suitable current and voltage flowing through the LED lamp beads are found through simulation of software, and simulation of full spectrum of sunlight is achieved by monochromatic LED lamp beads through the Fresnel lens.

Description

Full Spectrum LED Solar Simulator

technical field

The invention relates to a device for realizing solar simulation by using an array of LED lamp beads, in particular to a solar simulator covering full spectrum.

Background technique

With the continuous development of lighting sources, the luminous efficiency of light-emitting diodes (LEDs) has been continuously improved, and the light quality is high; the monochromatic LED has a narrow spectrum, so that when multiple LED monochromatic light sources emit light, the spectrum overlaps less and the spectrum becomes continuous. Choose a variety of LED light sources, including various spectral segments, and finally achieve full spectrum coverage; LED light color is relatively pure, and can be driven at low voltage; it has the characteristics of small size, long life, low heat generation, convenient and flexible control, etc. For the many advantages mentioned above, LED has attracted much attention in plant cultivation. The so-called LED sun simulation device is to use various LED light sources of different wavelengths to composite light through an optical integrator, so that it can produce an effect similar to sunlight. Experiments have shown that although the obtained LED light intensity is much smaller than the solar spectral irradiance, the composition of the spectral radiation beam obtained by the LED area array is very similar to that of sunlight. Theoretically, LED light source can be realized to simulate sunlight.

Solar simulation is a science and technology that uses artificial light sources to simulate the characteristics of solar radiation. With the advent of the photoelectric information age, solar simulators can achieve different solar irradiance intensities on the premise of fitting the solar spectrum with high precision. Realize the simulation of solar radiation characteristics in different regions and seasons in a short period of time to meet the special requirements of experimental research on solar radiation. The early solar simulators were mainly used in the aerospace field, and mainly responded to the needs of the field of space science to carry out space environment simulation experiments on the ground. Nowadays, solar simulators are more widely used. The emergence of various solar plant lights in agriculture has increased the production and income of more crops; in the building materials industry, the radiation resistance aging test of materials can prevent dangers before they happen; More recently, the successful development of a solar simulation device for human health care has further promoted the development of solar simulation technology.

Most of the solar simulators now use xenon lamp light source simulation, and there are large pulse fluctuations in the infrared part, which requires special filter processing to make it close to the solar spectrum; the traditional solar simulator ignition system and subsequent circuits are quite complicated, and the electro-optical conversion Low efficiency, long-term working electrical parameters drift, expensive and limited service life.

Contents of the invention

The purpose of the present invention is to solve the problems of complex ignition system and huge follow-up circuit of the existing solar simulator, high price and limited service life, and provide a full-spectrum LED solar simulator. The solar simulator uses LED as the light source, which is not only low in price, but also Long life, energy saving and environmental protection; and the circuit is simple, easy to control, especially able to realize full-spectrum solar simulation.

Technical scheme of the present invention:

A full-spectrum LED solar simulator, including a light source room, a circuit control room and a heat dissipation device, the light source room, circuit control room and heat dissipation device are arranged in an integrated cylinder, the upper part of the cylinder is the light source room, The light source room includes a light source panel, and the middle part of the light source panel is provided with an LED lamp bead array, and a group of heat dissipation round holes are opened on the light source panel around the LED lamp bead array; the cylinder above the light source room is used as a lampshade, and the upper end of the cylinder is An optical Fresnel lens is provided; the cylindrical body below the light source chamber is a circuit control chamber, including a control chip and a current-limiting resistor, one end of the current-limiting resistor is connected to the control chip, and the other end of the current-limiting resistor is connected to the LED bead array. The other end of the LED lamp bead array is connected to a switching power supply; the lower part of the cylinder body is provided with a cooling device. The heat dissipation device is a large fan, and the large fan is used to dissipate heat from the current limiting resistor and the LED bead array.

The whole light source panel other than the LED lamp bead array in the light source room is covered with reflective paper with high reflectivity, the switching power supply drives the LED lamp bead array, and the light source is emitted from the LED lamp bead array on the light source panel; the current limiting resistor is fixed On the aluminum sheet, a group of heat dissipation round holes are also opened on the aluminum sheet other than the current limiting resistor. The entire aluminum sheet is made into a heat sink at an angle of 120 degrees and fixed on the inner wall of the cylindrical cylinder. The entire cylindrical cylinder forms a large heat dissipation noodle.

The wavelength range of the LED lamp bead is 365nm-940nm, one kind of LED lamp bead is selected every 10nm, and the LED sun simulation is realized by combining monochromatic light. According to the special requirements of the peak-to-peak value of the solar spectrum irradiance diagram, a LED lamp bead solar simulation lamp array containing at least 20 wavelengths is designed.

the

The invention controls the luminous power of each LED lamp bead through a chip control circuit, measures the irradiance with an irradiance meter, and uses MATLAB software to perform high-order fitting on the obtained data, so that the LED luminous irradiance is closer to the solar spectrum irradiance , culminating in a full-spectrum LED sun simulation.

the

Advantages and beneficial effects of the present invention:

The invention can realize the simulation of the full spectrum of the sun. The use of new LED lamp beads is low in price, energy-saving and environmentally friendly. It is powered by DC power supply and can be driven at low voltage. The current limiting circuit only uses resistive elements. The circuit structure is simple and flexible, and it is easier to control.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the full-spectrum solar simulator of the present invention.

Figure 2 is a schematic diagram of the working principle of the full-spectrum solar simulator.

Figure 3 Solar spectral irradiance diagram.

Figure 4 MATLAB software simulation fitting diagram.

In the figure, 1 optical Fresnel lens, 2 light source panel, 3 LED lamp bead array, 4 cylinder body, 5 aluminum sheet, 6 large fan, 7 round hole, 8 control chip, 9 cement resistor, 10 solar simulator LED Light source, 11 Fresnel lens, 12 small lens, 13 light screen, 14 illuminance meter, 15 computer data acquisition and fitting processing.

The full-spectrum LED solar simulator will be described in detail below in conjunction with the accompanying drawings.

Detailed ways

Figure 1 shows the overall design device of the full-spectrum solar simulator provided by the present invention. The solar simulator includes a light source room, a circuit control room and a heat dissipation device. The light source room, the circuit control room and the heat dissipation device are arranged in an integrated cylinder 4, and the upper part of the cylinder 4 is a light source room. The chamber includes a light source panel 2, and the middle part of the light source panel is provided with an LED lamp bead array 3, and a group of heat dissipation round holes 7 are opened on the light source panel around the LED lamp bead array; the cylindrical cylinder above the light source chamber is used as a lampshade, and the cylindrical cylinder The upper end of the body is provided with an optical Fresnel lens 1; the cylindrical body below the light source room is a circuit control room, including a control chip 8 and a current limiting resistor 9 (cement resistor), one end of the current limiting resistor is connected to the control chip, and the current limiting resistor The other end of 9 is connected to each LED lamp bead, and the other end of the LED lamp bead array 3 is connected to a switching power supply; the lower part of the cylinder body is provided with a cooling device. The heat dissipation device is a large fan 6, and the large fan is used to dissipate heat from the current limiting resistor and the LED bead array.

The current-limiting resistor is fixed on the aluminum sheet 5, and a group of heat dissipation round holes 7 are also opened on the aluminum sheet other than the current-limiting resistor. The entire aluminum sheet is made into a heat sink at an angle of 120 degrees, and is fixed on the inner wall of the cylinder , the entire cylinder constitutes a large heat dissipation surface.

The wavelength range of the LED lamp bead is 365nm-940nm, one kind of LED lamp bead is selected every 10nm, and the LED sun simulation is realized by combining monochromatic light. According to the special requirements of the peak-to-peak value of the solar spectrum irradiance diagram, a LED lamp bead solar simulation lamp array containing at least 20 wavelengths is designed.

the

In Figure 1, optical Fresnel lens 1, light source panel 2, LED lamp bead array 3, cylindrical barrel wall 4, aluminum sheet 5, large fan 6, round hole 7, control chip 8, cement resistor 9, in Figure 2, Small lens 12, light screen 13, illuminance meter 14, computer 15, the concrete connection relationship and working process of this solar simulator are as follows:

Place the LED lamp bead array (3) on the light source panel (2), and neatly punch a series of round holes (7) on the other parts of the light source panel (2), and remove the round holes (7) on the light source panel (2) ) covered with high-reflectivity reflective paper, which facilitates heat dissipation and makes the outgoing light more uniform, which also constitutes the main body of the light source room; a 30cm diameter Fresnel lens (1) is placed at the front of the light source room, and the LED light array passes through the wire and The cement resistors (9) are connected, all the LED lamp beads are connected in parallel and the current is limited by the cement resistors (9) in series, and the parallel main road passes through the control chip (8), and the cement resistors (9) are bound to the aluminum sheet ( 5), a series of small holes (8) are also neatly punched on the aluminum sheet (5), and the three aluminum sheets (5) bound with cement resistors (9) are extruded on the cylindrical barrel wall at an angle of 120 degrees (4) and fixed with screws, the entire aluminum sheet is arranged in a curved straight strip; a large fan (6) of 18cm*18cm is placed at the bottom of the entire device, and the entire wind flows from bottom to top and passes through the circuit control room in turn And the light source room, so that the solar simulator can work efficiently for a long time; measure the irradiance of each LED lamp bead in the LED lamp array (3) through the illuminance meter (14), and collect data through the computer (15) With the high-level fitting of the software, the obtained LED lamp array irradiance fitting curve is compared with the solar spectral irradiance curve.

Explanation: Figure 3 is the solar spectrum irradiance diagram, which can be downloaded from the Internet to meet the national standard solar spectrum diagram. Figure 4 is the LED lamp array fitting curve, using MATLAB software to summarize the obtained irradiance data, and high-order fitting to obtain the graph.

Claims (5)

1. a full-spectrum LED solar simulator, comprise light source chamber, circuit control room and heat abstractor, it is characterized in that described light source chamber, circuit control room and heat abstractor are arranged in the cylindrical tube of an one, top in cylindrical tube is light source chamber, light source chamber comprises light source panel, and the middle part on light source panel is provided with LED lamp pearl array, has one group of heat radiation circular hole on the light source panel of LED lamp pearl array surrounding; The cylindrical tube of the above part of light source chamber is as lampshade, and cylindrical tube upper end is provided with optics Fresnel Lenses; The cylindrical tube of the following part of light source chamber is circuit control room, comprises control chip and current-limiting resistance, and one end of current-limiting resistance connects control chip, and the other end of current-limiting resistance connects each LED lamp pearl, the other end connecting valve power supply of LED lamp pearl array; Bottom in cylindrical tube is provided with heat abstractor.

2. full-spectrum LED solar simulator according to claim 1, is characterized in that: described heat abstractor is a big fan, uses big fan to current-limiting resistance and the heat radiation of LED lamp pearl array.

3. full-spectrum LED solar simulator according to claim 1, is characterized in that: on the light source panel beyond light source indoor LED lamp pearl array, the whole reflecting paper with high reflectance covers;

By Switching Power Supply, drive, light source is penetrated by the LED lamp pearl array on light source panel; Described current-limiting resistance is fixed on aluminium flake, has equally one group of heat radiation circular hole on the aluminium flake beyond current-limiting resistance, and whole aluminium flake is made heat radiation sheet with 120 degree angles, and is fixed on cylindrical tube inwall, and whole cylindrical tube forms a large radiating surface.

4. full-spectrum LED solar simulator according to claim 1, is characterized in that: the wave-length coverage of described LED lamp pearl is 365nm-940nm, every 10nm, selects a kind of LED lamp pearl, utilizes the compound LED of the realization solar simulation of monochromatic light.

5. full-spectrum LED solar simulator according to claim 4, is characterized in that: according to the specific (special) requirements of solar spectrum irradiance pattern peak-to-peak value, design a kind of LED lamp pearl solar simulation lamp battle array that contains at least 20 kinds of wavelength.