China's sensor industry should adapt to the trend of technology, according to market demand, to achieve "new seedlings alternate, far and near combination, variety, meet the needs", to achieve "big, medium and small", "group and professional production coexist", The development of internationalization combining the two markets at home and abroad will allow sensors and instrumentation to seize the development opportunities of informationization. The status quo of sensors and measuring instruments, and predicting the future development trend Industrial equipment is inseparable from various mechanical quantities and geometric quantities in the manufacturing process and the performance test of the whole machine. Some industrial equipments often carry out various quantities in operation. Detection or monitoring, including displacement, velocity, acceleration, force, torque, power, pressure, flow, temperature, hardness, density, humidity, specific gravity, viscosity, length, angle, shape, position, surface roughness, surface waveform, etc. Both belong to physical quantities. In the actual production, life and scientific experiments, chemical quantities and biomass (including medicine) will be encountered, and all of them, from the perspective of signal engineering, need to be converted into electrical signals by sensors (in modern times, Converted into an optical signal), and then transmitted, processed, stored, displayed, controlled... from the perspective of information, these signals, together with sound and image information, are the source of information, so sensors and instruments, measurements Instrumentation is an important part of the three parts of information science and technology (information acquisition, information transmission, information processing).
In modern industrial equipment, sensors and measuring instruments are an indispensable part. It can also be seen from the following two aspects: if traditional industrial equipment adds necessary sensors to it, and equipped with precision measuring parts (accessories), Its function and precision can be improved, it is easy for users to operate and maintain, the safety level can be improved, and the equipment can be added value; industrial equipment as the control object of the automation system or as part of the automation system must be able to interact with the automation system in three parts (detection and control) Compatible or interfaced to integrate into an organic whole, whether it is stand-alone automation or as part of a larger automation device, the use of the industrial device is expanded. In summary, the addition of sensors and measuring instruments, measuring instruments or providing interfaces as industrial equipment itself is a necessary condition for the upgrading of conventional equipment.
A sensor is a device that converts non-electricity into an electrical signal. Under the condition of analog electronic technology, the measuring instrument generally includes a sensor, a sampling point sampling device and an amplifier (for anti-interference processing and signal transmission), and of course, a power supply and The on-site display part (optional), the electrical signal is generally continuous quantity, discrete quantity, in fact, it can also be divided into analog quantity, switch quantity, pulse quantity, etc. The analog signal transmission adopts unified signal (4-20mADC, etc.). In the process of digitization, the instrumentation changes are relatively large. After several stages, ASIC-specific integrated circuits have recently been used, and the sensors, microprocessors and network interfaces are packaged in one device to complete information acquisition, processing, transmission, storage, etc. Features. In automated instruments, measuring instruments are often referred to as transmitters, such as problem transmitters, pressure transmitters, and the like.
Because the sensors are used in all walks of life, coupled with the rapid development of the three aspects of household appliances, automobiles and information industry in recent years, the demand for sensors has increased greatly, so the sensor manufacturing industry has developed rapidly and formed an independent industry, which has driven industrial equipment, especially It is the development of semiconductor equipment manufacturing, so it is necessary to pay special attention to the sensor industry.
There are many varieties of sensor products, based on many scientific principles, technology-intensive, diverse, marginal, comprehensive and technical, requiring multi-disciplinary and multi-tech cooperation. Although the sensor has high added benefit, but its price is not high, it is difficult to promote the development of the sensor industry.
Sensors and instrumentation status categories <br> <br> varieties of many sensors, mainly for industrial processes of: temperature sensors, pressure sensors, weight sensors, flow sensors, level sensors, an oxygen-sensitive sensor, a force sensitive sensor , gas sensor, analytical instrument..., also used in the machinery industry: switch type proximity / positioning sensor safety door switch and other safety sensors, rotary encoders, vision sensors, speed sensors, acceleration sensors, etc., domestic sensors are divided into 10 Large categories, 24 categories, 6,000 varieties, and more foreign varieties, such as the United States has about 17,000 sensors, so the field of development of sensor varieties is very broad.
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