The historical scrolls and the dream five rings at the opening ceremony of the Beijing Olympics left a deep impression. However, not many people know that the hero of the "Director" scene is a product called LED (Light Emitting Diode).
"The investment in LED lighting in the 2008 Beijing Olympic Games is about 500 million yuan. Its large number of applications indicate that the LED lighting technology has a very broad prospect in the electronics and lighting industry," said Liu Hui, an associate researcher at the China Institute of Metrology. Liu Hui’s Optical and Laser Metrology Institute’s Photometric Room is currently developing LED product magnitude measurements and related national standards.
In the 1960s, the first LED made using the principle of semiconductor PN junction light source was introduced. Due to its low light efficiency, it can only be used as an indicator light on electrical equipment and instruments. After more than 30 years of development, LED light color is more abundant. In the early 1990s, the development of two new materials, GaAlInP with red and yellow light and GaInN with green and blue light, led LEDs to gradually enter the field of display and illumination. At present, LED is widely used in traffic signals, outdoor night lighting, interior decoration and functional lighting. LED display has become the standard configuration of public facilities. With the advancement of technology and the development of new solar spectrum white LEDs, the development and application of LEDs has become more and more extensive.
China is a big country in the production and use of LED products. In 2007, China's LED application market sales revenue was 4.2 billion US dollars, and composite packaging production accounted for 15% of the world. With the rapid development of the LED industry, the industry requires accurate measurement of the light, color, electricity and heat parameters of LEDs in order to facilitate quality control and product sales. Many enterprises in China have gradually developed and tested the relevant instruments in the industrial chain of LED chips, luminescent materials, LED tubes, LED lamps, etc., including the testing instruments for laboratory research and development, automatic detection on the production line. Separation equipment and quality inspection instruments for products.
However, due to the constraints of certain instrument manufacturing technology and the gap in understanding of LED measurement standards, there are often significant differences in instrumental measurements between manufacturers. For the same LED tube, the measurement results between the two manufacturers may have a deviation of 10% or even tens of percent, far exceeding the range of general photometric accuracy.
Liu Hui introduced that the current traceability method of LED measuring instruments is not uniform, and the uncertainty caused by instrument calibration is much higher than other photometric instruments. Therefore, it is urgent to establish a LED-specific standard and value traceability system. Although the various light and color parameters of the LED can be traced back to the established measurement base standard, the LED has its own characteristics and cannot be completely in accordance with the current test method of the incandescent lamp.
At present, the Institute of Optics and Laser Technology of China Institute of Metrology is conducting research work in this area, using LEDs that are consistent with or close to the parameters actually used by customers as a transmission standard, which can improve the consistency of measurement results and reduce the measurement instruments. Requirements and quality requirements. Accurate and consistent measurement results are the premise and guarantee for the healthy development of the industry, the regulation of market order, and fair competition.
The establishment of special measurement standards for LED light and color parameters will unify the measurement and calibration of the luminosity and chromaticity, irradiance and electrical parameters of LEDs, and will promote the production, application and export of LEDs in China. On the one hand, it can promote the improvement of the quality of China's LED products, and play a normative role in the current situation of inconsistent value transmission; on the one hand, with the development of economic globalization, the demand for mutual recognition of measurement data is increasing, and its foundation depends on countries. The level and consistency of the measurement baseline.
To this end, the International Bureau of Metrology (BIPM) also invited the National Metrology Institutes to sign the National Mutual Standards and the Mutual Recognition Agreement for Calibration and Measurement Certificates issued by the National Metrology Institute (MRA) in 1999. National measurement standards and mutual recognition schemes for calibration and measurement certificates issued by the National Metrology Institute. The International Standards Organization (ISO)'s newly revised International Standard for Laboratory Capability Evaluation (ISO 17025-2000) has clearly stated that all measurement data issued by various laboratories must be traceable, that is, traceable to national measurement standards.
China Institute of Metrology represents China's participation in the international comparison of luminous intensity units organized by the International Committee of Metrology's Photometric Radiation Advisory Committee (CCPR) from 1997 to 1998. A total of 16 countries participated in the comparison. The results show that China's luminous intensity units and international The average is only 0.16%, which is in the international advanced rank. At the same time, China also participated in the international comparison of the responsiveness of the photometer. There are 15 countries participating in the competition. Among them, the value of the four countries differs from the average value by ≤0.2%, and the deviation of China is 0.2%. The unit of luminous intensity in China is in line with the international average.
At present, all the photometric projects in China have entered the international calibration and mutual recognition database CMC, which means that the certificates issued by us on these projects are internationally recognized and do not need to be tested repeatedly.
"The investment in LED lighting in the 2008 Beijing Olympic Games is about 500 million yuan. Its large number of applications indicate that the LED lighting technology has a very broad prospect in the electronics and lighting industry," said Liu Hui, an associate researcher at the China Institute of Metrology. Liu Hui’s Optical and Laser Metrology Institute’s Photometric Room is currently developing LED product magnitude measurements and related national standards.
In the 1960s, the first LED made using the principle of semiconductor PN junction light source was introduced. Due to its low light efficiency, it can only be used as an indicator light on electrical equipment and instruments. After more than 30 years of development, LED light color is more abundant. In the early 1990s, the development of two new materials, GaAlInP with red and yellow light and GaInN with green and blue light, led LEDs to gradually enter the field of display and illumination. At present, LED is widely used in traffic signals, outdoor night lighting, interior decoration and functional lighting. LED display has become the standard configuration of public facilities. With the advancement of technology and the development of new solar spectrum white LEDs, the development and application of LEDs has become more and more extensive.
China is a big country in the production and use of LED products. In 2007, China's LED application market sales revenue was 4.2 billion US dollars, and composite packaging production accounted for 15% of the world. With the rapid development of the LED industry, the industry requires accurate measurement of the light, color, electricity and heat parameters of LEDs in order to facilitate quality control and product sales. Many enterprises in China have gradually developed and tested the relevant instruments in the industrial chain of LED chips, luminescent materials, LED tubes, LED lamps, etc., including the testing instruments for laboratory research and development, automatic detection on the production line. Separation equipment and quality inspection instruments for products.
However, due to the constraints of certain instrument manufacturing technology and the gap in understanding of LED measurement standards, there are often significant differences in instrumental measurements between manufacturers. For the same LED tube, the measurement results between the two manufacturers may have a deviation of 10% or even tens of percent, far exceeding the range of general photometric accuracy.
Liu Hui introduced that the current traceability method of LED measuring instruments is not uniform, and the uncertainty caused by instrument calibration is much higher than other photometric instruments. Therefore, it is urgent to establish a LED-specific standard and value traceability system. Although the various light and color parameters of the LED can be traced back to the established measurement base standard, the LED has its own characteristics and cannot be completely in accordance with the current test method of the incandescent lamp.
At present, the Institute of Optics and Laser Technology of China Institute of Metrology is conducting research work in this area, using LEDs that are consistent with or close to the parameters actually used by customers as a transmission standard, which can improve the consistency of measurement results and reduce the measurement instruments. Requirements and quality requirements. Accurate and consistent measurement results are the premise and guarantee for the healthy development of the industry, the regulation of market order, and fair competition.
The establishment of special measurement standards for LED light and color parameters will unify the measurement and calibration of the luminosity and chromaticity, irradiance and electrical parameters of LEDs, and will promote the production, application and export of LEDs in China. On the one hand, it can promote the improvement of the quality of China's LED products, and play a normative role in the current situation of inconsistent value transmission; on the one hand, with the development of economic globalization, the demand for mutual recognition of measurement data is increasing, and its foundation depends on countries. The level and consistency of the measurement baseline.
To this end, the International Bureau of Metrology (BIPM) also invited the National Metrology Institutes to sign the National Mutual Standards and the Mutual Recognition Agreement for Calibration and Measurement Certificates issued by the National Metrology Institute (MRA) in 1999. National measurement standards and mutual recognition schemes for calibration and measurement certificates issued by the National Metrology Institute. The International Standards Organization (ISO)'s newly revised International Standard for Laboratory Capability Evaluation (ISO 17025-2000) has clearly stated that all measurement data issued by various laboratories must be traceable, that is, traceable to national measurement standards.
China Institute of Metrology represents China's participation in the international comparison of luminous intensity units organized by the International Committee of Metrology's Photometric Radiation Advisory Committee (CCPR) from 1997 to 1998. A total of 16 countries participated in the comparison. The results show that China's luminous intensity units and international The average is only 0.16%, which is in the international advanced rank. At the same time, China also participated in the international comparison of the responsiveness of the photometer. There are 15 countries participating in the competition. Among them, the value of the four countries differs from the average value by ≤0.2%, and the deviation of China is 0.2%. The unit of luminous intensity in China is in line with the international average.
At present, all the photometric projects in China have entered the international calibration and mutual recognition database CMC, which means that the certificates issued by us on these projects are internationally recognized and do not need to be tested repeatedly.
Contact Pin,Spring Loaded Contact Pin,Spring Loaded Contact Pin
Pogo pin CO.,Ltd , http://www.nspogopin.com