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Non imaging optics is currently being used in LED lighting for a growing shortag

时间:2017-04-06 10:38:09    来源:

At this stage, in the global energy shortage situation, energy saving and consumption reduction has become a serious problem we have to face. Lighting system brings people bright, but also consumes energy all the time. In order to reduce the energy consumption as much as possible, energy-saving lighting system has attracted more and more attention. LED has been widely used in many fields because of its low energy consumption, long service life and high economic performance. Design of LED lighting system in the past is in the experiment using the model to complete, after the completion of the design once found its optical properties do not meet the requirements, we must re design, thus wasting a lot of manpower and financial resources. With the development and progress of Applied Optics, the theory and method of non imaging optics have been improved. Based on this point, this paper discusses the application of non imaging optics to LED lighting.
1 non imaging optics and related concepts
1.1 non imaging optics
Different from the traditional optical imaging and non imaging optics is not able to focus on light quality imaging and imaging in the target plane, the main concern is the utilization of energy source and the energy in the azimuth angle and the space of the specific distribution. As shown in Fig. 1, in the imaging optical system, the main transmission is the light intensity and position information of object points, while in non imaging optical systems, the transmission, recombination and distribution of the point energy are mainly carried out.
Figure 1 Schematic imaging of optical and non imaging optical functions
1.2 energy collection rate
Non imaging optics mainly focus on the distribution of energy, if the establishment of a as shown in Figure 2 of the non imaging optics model, from which they can see clearly that the plane A is represented by the entrance aperture area, and the plane A where is the exit aperture area. In the following, we assume that the aperture area A of the device can let all light pass through this area, and the ratio between the incident beam area and the outgoing beam area is C, which is the energy collection rate. Typically, the maximum energy collection rate in the 2D system is C2D=l/sin, while in rotationally symmetric 3D systems, the maximum collection rate is C3D=1/sin2 theta. The concept of energy harvesting rate is mainly used in the evaluation of non imaging optical systems.
Fig. 2 concept of energy collection rate
1.3 geometrical optics
At present, geometrical optics has been widely used in the design of optical systems. Imaging optics and non imaging optical systems must be based on the theory of geometrical optics in their design. There are four basic laws in geometrical optics, namely, the law of rectilinear propagation of light, the law of independent propagation, the law of refraction and the law of reflection.
(1) the law of rectilinear propagation of light. The law mainly illustrates a problem in which a light travels along a straight line in a homogeneous and isotropic medium.
(2) the law of independent propagation of light. Light beams emitted by different light sources pass through a point in space in different directions and are independent of each other and do not affect each other.
(3) the law of reflection of light. When incident, reflected and projected three rays are located in the same plane, the reflection angle is equal to the absolute angle of the incident angle, and the sign is opposite, while the incident and reflected light will be on both sides of the projection point normal.
(4) the law of refraction of light. And the law of reflection is similar, but also when the three kinds of light in the same plane, the angle of incidence and refraction angle of the ratio of sine angle and size does not have relations, mainly related to the specific nature of the media.
Characteristics and classification of 2 LED
Before the characteristics and classification of LED, let us first look at the concept of LED, the so-called LED is the abbreviation of Diode Emitting Light English Chinese, meaning that the light emitting diode, it is capable of converting electrical energy into visible light of the semiconductor device, the device is usually in the form of solid state. The key core of LED is the semiconductor wafer, which consists of two parts, P type semiconductor and N type semiconductor.
2.1, the main features of LED
Because LED adopts the principle of electric field luminescence, its characteristics are very obvious, which can be summed up as follows:
(1) long service life. The average LED service life can reach 10 years or so. This is because LED is different from the traditional light source, it will not happen suddenly does not work or is the same as suddenly burn incandescent light, its damage is mainly associated with the passage of time and the resulting luminescence properties gradually weaken. For example, the LUXEON series, made by PHILPS, will still retain about 70% of its initial light intensity after 50 thousand hours of use.
(2) the cost of maintenance is low. Under normal circumstances, compared with the ordinary light source, the service life of LED is equivalent to more than 10 times of them, so the cost of light source replacement is greatly reduced. Accordingly, the maintenance cost and labor cost are also reduced.
(3) low energy consumption. Compared with fluorescent lamps or incandescent lamps, LED has much higher luminous efficiency. LED produced by GREE company XR-E model, the luminous rate can reach more than 1001m/W. From the perspective of energy conservation, energy conversion efficiency is higher expressed in the same lighting electric energy consumption is less, this is one of the biggest advantages of LED.
(4) small size. This characteristic mainly aims at the LED chip. The LED chip at this stage has the smallest size and can reach millimeter scale. Such as Lumileds developed by the United States Rebel manufacturing, its packaging after the volume of only 3x4.5x2.1 (unit mm), the chip size is only lmmx lmm. Such a small size is very convenient for optical design, but also effectively reduce the energy loss of the system

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