The northern region can be said to be the birthplace of China's LED chip industry, including the 13th Research Institute of China Electronics Technology Group Corporation, Qingxin Optoelectronics, Beijing Changdian Zhiyuan, Hebei Lide and other units have been well-known in China's LED chip industry. Business or institution. The northern region has also cultivated a large number of talents for the Chinese LED chip industry, especially the thirteen. As the earliest unit in China to develop ultra-high brightness LEDs, it was also the early technical support unit of Xiamen Sanan Optoelectronics.
Figure 1, the proportion of LED chip companies in the North
Note: The number of enterprises is calculated according to the base. For example, Sanan Optoelectronics has three bases in Xiamen, Wuhu and Tianjin, and counts three.
Other areas include: Yangtze River Delta, Northern Region, Fujian Jiangxi Province and other southern regions, the same below.
Source: Gaogong LED Industry Research Institute (GLII)
After nearly ten years of development, the LED chip companies in the northern region have withdrawn from the industry in different ways, and the fact that the proportion of enterprises and output value has also decreased year by year confirms the industrial changes in the above regions. The rapid rise of the southern LED industry, represented by the Yangtze River Delta and South China, has caused the scale and influence of the northern LED industry to decline year by year in the past few years.
This paper will compare the number of enterprises, production capacity and revenue data to illustrate the current status of the LED chip industry in the northern region, and analyze the future industrial development pattern of the region.
The number of enterprises accounted for 21%, ranking second
According to statistics from the High-Tech LED Industry Research Institute (GLII), as of the end of 2011, the total number of LED chip companies in China was 95, of which 20 were in the northern region, accounting for 21%.
Figure 2. Distribution of LED chip companies in the northern region
Source: Gaogong LED Industry Research Institute (GLII)
Figure 3. The proportion of MOCVD in chip companies in the North
Source: Gaogong LED Industry Research Institute (GLII)
Piezoelectric ceramic disc
Quick delivery
High performance
Application: flow meter measurement
There are many kinds of USF used in closed pipeline according to the measuring principle, and the most commonly used are propagation time method and Doppler method. Among them, time difference ultrasonic flowmeter is used to measure fluid flow by the principle that the time difference of sound wave propagating downstream and countercurrent is proportional to the velocity of fluid flow. It is widely used in raw water measurement of rivers, rivers and reservoirs, process flow detection of petrochemical products, water consumption measurement of production process and other fields. According to practical application, time-difference ultrasonic flowmeter can be divided into portable time-difference ultrasonic flowmeter, fixed time-difference ultrasonic flowmeter and time-difference gas ultrasonic flowmeter.
Ultrasonic flow-meters use at least two transducers aligned so that ultrasonic pulses travel across the flow of liquid or gas in a pipe at a known angle to the flow.
Technical data:
Electromechanical coupling coefficient Kp: > 0.62
Dielectric Loss tg δ: <2%
Nominal Piezo discs for ultrasonic flowmeter:
OD14.2*1MHz PZT-51
OD14.6*1MHz PZT-51
OD15*1MHz PSnN-5
OD15*2MHz PSnN-5
OD20*1MHz PSnN-5OD20*2MHz PSnN-5
OD15*1MHz PZT-51
OD15*2MHz PZT-51
OD20*1MHz PZT-51OD20*2MHz PZT-51
Size, Frequency and Electrode on request.
Piezoelectric Discs For Flowmeter Sensor
Piezoelectric Ceramic Disc,Piezoelectric Discs For Flowmeter Sensor
Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com