When buying TV, screen size is the primary factor for us to consider. The bigger the better, it has already penetrated into our bones. However, TVs of different sizes have a suitable viewing distance. The larger the TV, the greater the distance. Less than this distance, not only the viewing effect is not good, but it is easy to hurt the eyes after a long time. At present, the general urban working class home living room is also about 20 square meters, leaving the sofa to the TV's distance is 3-4 meters, the maximum distance is suitable for a 50-60 inch TV. In a recent survey, it was found that 55-inch large-screen TVs have become the first choice for consumers, which also confirms my view.
Through investigation, it was learned that when ordinary users purchase LCD TVs, the image quality is still the user's first concern, and after the display technologies such as Hisense strongly promote their own ULED, OLED, Quantum TV, etc., more and more users It is believed that the display technology is the most critical factor affecting the quality of the TV. Secondly, the degree of attention related to smart-related online movies, smart interfaces, and control methods is greatly increased. The blind evaluation of the “Huantai†is based on these projects, and blind evaluation will cover all places with brand logos, and the TV will be adjusted to the factory settings, letting 24 users who have not used these three TVs His own on-site experience scored three televisions labeled A, B, and C from left to right.
Smart related:
A, C smart interface is simple; B smart interface is rich in content, easy to operate.
Online movie search: Search the hit drama "Ban List" and play it on the same network.
A. The resources are relatively abundant. The film and television search is troublesome and takes a long time, but it successfully searches for and plays the "Ban List."
B is rich in resources, easy and fast to search, quickly search to "Ban List" and play;
There are few C resources, and the search is simple.
Display technology
In terms of sharpness and color, A, B, and C perform equally.
On the level, A performance is relatively poor, B is slightly better than C, but in the trailing test of the motion picture, B performs the worst, A, C is relatively good.
In the 4K screen and ordinary high-definition video playback, the three are doing well.
The author experience:
TV A, the color is slightly whitish, the display level is worse, and the other is not very good in the smart interface and online video.
TV B, the overall performance is very good, the screen is slightly brighter, the color is very much like the eyes of the people, but there is a drawback is that in the sports quality, there is a sense of frustration in the image smear experiment.
TV C, the picture is a bit dark, poor in smart and online video resources, performance is not like the price of 8,000 yuan TV.
The answer was revealed: A: Samsung 55-inch UHD curved TV; B: Hisense 55-inch curved TV; C Sony 55-inch TV. The best overall performance of the blind review process is B: Hisense TV.
This result is not surprising. The survey results also prove that the people's eyes are bright, which reflects the current overall situation of the entire home appliance industry: shielding keywords are the decline of home appliance manufacturers, the rise of domestic smart TV brands! Regardless of price factors, in terms of display technology, domestic television has used Hisense as an example. Its display technologies such as ULED, OLED, and Quantum-dot TV have reached the advanced level of shielding keywords, and local advantages have made it easier to obtain rich online that meets the needs of local audiences. Video resources; if coupled with price advantage, the same price, domestic TV performance is naturally superior! While I was pleased with the performance of domestic TV, I felt a bit of a hurry. There are still some gaps in the individual aspects of domestic TV such as dynamic picture quality and shielding keywords, and we need to chase!
Piezoelectric Discs For Flowmeter Sensor
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 Ceramic Disc,Piezoelectric Disk Flow Meter,Piezoelectric Flow Sensor,Piezo Discs Flowmeter
Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com