What are the advantages of smart temperature sensors
Sensors are used in many places. Nowadays, with the maturity of technology and the progress of science, various products are also developing towards intelligence. For example, sensors have been upgraded, and the emergence of intelligent temperature and humidity sensors has made the functions of sensors more better play out.
As an important tool to obtain information, sensors play an important role in industrial production, science and technology and other fields. However, with the rapid development of microprocessor technology and the development of automation and intelligence of measurement and control systems, traditional sensors have been combined with various microprocessors and connected to the network, forming a system with information detection, signal processing, and logical thinking. Smart sensors with a series of functions.
Intelligent sensor is a sensor with information processing function. The intelligent sensor has a microprocessor, which has the ability to collect, process and exchange information. It is the product of the combination of sensor integration and microprocessor. Compared with general sensors, smart sensors have the following three advantages: high-precision information collection can be achieved through software technology, and the cost is low; it has certain programming automation capabilities; and its functions are diversified.
As a tool for humans to obtain information, sensors are an important part of modern information technology. In the traditional sense, the output of sensors is mostly analog signals, and they do not have signal processing and networking functions. They need to be connected to specific measuring instruments to complete the signal processing and transmission functions. The intelligent sensor can process the raw data internally, and can exchange data with the outside world through a standard interface, and change the work of the sensor through software control according to actual needs, so as to achieve intelligence and networking. Due to the use of standard bus interface, the intelligent sensor has good openness and scalability, which brings a lot of development space to the expansion of the system.
Smart sensor is a new type of sensor that can sense and detect certain information of the measured object; can learn, reason, judge and process signals; and has communication and management functions. Smart sensors have the ability to automatically zero, calibrate, compensate, and collect data. Its ability determines that the intelligent sensor also has higher precision and resolution, higher stability and reliability, better adaptability, and also has a very high cost performance compared to traditional sensors.
The first intelligent temperature sensor launched in the mid-1990s uses an 8-bit A/D converter, which has a low temperature measurement accuracy and a resolution of only 1 degree. A variety of high-precision, high-resolution intelligent temperature sensors have been launched abroad one after another, using 9-12-bit A/D converters, and the resolution can generally reach 0.5-0.0625 degrees. The DS1624 high-resolution sub-intelligent temperature sensor newly developed by DALLAS Semiconductor Corporation of the United States can output 13-bit binary data, its resolution is as high as 0.03125 degrees, and the temperature measurement accuracy is plus or minus 0.2 degrees. In order to improve the conversion rate of the multi-channel intelligent temperature sensor, some chips also use high-speed successive approximation A/D converters. Taking AD7817 5-channel intelligent temperature sensor as an example, its conversion time for local sensor and each remote sensor is only 27US and 9US respectively.
The testing capabilities of new smart temperature sensors are also being enhanced. For example, the DS1629 single-wire temperature sensor adds a real-time calendar clock (RTC) to make it more functional. DS1624 also increases the storage function, using the E2PROM memory of 256 bytes inside the chip, it can store the user's short information. In addition, intelligent temperature sensors are developing from single-channel to multi-channel, which creates good conditions for the development and development of multi-channel temperature measurement and control systems.
Smart temperature sensors all have a variety of working modes to choose from, mainly including single conversion mode, continuous conversion mode standby mode, and some have added low temperature limit extension mode, which is very easy to operate. For some intelligent temperature sensors, the host (external microcontroller or microcontroller) can also set its A/D conversion rate resolution and maximum conversion time through the corresponding registers.
The bus technology of the intelligent temperature sensor has also been standardized and standardized. The main buses used are single-wire (1-WIRE) bus, I2C bus, SMBUS bus and SPI bus. As a slave, the temperature sensor can communicate with the master through a dedicated bus interface.
The emergence of these new functions will enable the intelligent temperature and humidity sensor to have more functions, better monitor temperature and humidity, better serve us, realize intelligence and standardization, and bring great benefits to production work. Great convenience. Therefore, in general, intelligent temperature and humidity sensors have many functions and are indispensable for production needs.
The ONU has two functions: it selectively receives the broadcast sent by the OLT, and responds to the OLT if the data needs to be received; collects and buffers the Ethernet data that the user needs to send, and sends it to the OLT according to the assigned sending window The end sends the buffered data.
The application of ONU can effectively improve the uplink bandwidth utilization of the entire system, and it can also configure the channel bandwidth according to the network application environment and applicable service characteristics to carry as many end users as possible without affecting the communication efficiency and communication quality, and improve the network utilization Rate and reduce user costs.
The concept of Passive Optical Network (PON) has a long history. It has the characteristics of saving optical fiber resources and being transparent to network protocols, and it plays an increasingly important role in optical access networks. At the same time, after 20 years of development, Ethernet technology has almost completely dominated the local area network with its simple, practical, and low-cost characteristics, and in fact has been proved to be the best carrier for carrying IP data packets. As the proportion of IP services in metro and trunk transmission continues to rise, Ethernet is also gradually penetrating access, metro and even backbone networks through improvements in transmission rate and manageability. The combination of Ethernet and PON resulted in the Ethernet Passive Optical Network (EPON). It has the advantages of Ethernet and PON at the same time, and is becoming a popular technology in the field of optical access networks.
EPON is a kind of emerging broadband access technology. It realizes integrated service access of data, voice and video through a single optical fiber access system, and has good economic efficiency. The industry generally believes that FTTH is the ultimate solution for broadband access, and EPON will also become a mainstream broadband access technology. Due to the characteristics of the EPON network structure, the special advantages of broadband access to the home, and the natural organic combination with computer networks, experts all over the world agree that passive optical network is the realization of "three networks in one" and the solution to the information highway The best transmission medium for the "last mile".
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