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Star meter encyclopedia: Dynamic calibration of sensors

Dynamic calibration of sensors has always been a difficult problem in the development of sensors. In recent years, it is mainly used in the military defense field, gradually to the civilian field, making more and more people in this area of research. Dynamic calibration of sensors, relatively speaking, foreign research for a longer period of time, involving a wider range of areas. Like the United States, Russia, Germany, India, etc., have achieved a high level. At home, especially in the last 5 or 6 years, some manufacturers and researchers in the field have carried out in-depth research, and achieved relatively satisfactory results. Dynamic measurements compared with static measurements, not only to use fast enough response sensors and secondary instruments, but also from the original measurement results to the final measurement results of the complex solution, that is, signal recovery. In order to make signal recovery possible, the dynamic response characteristics of the sensors used must be known in advance. Dynamic calibration is in the case of such objective needs, arise and develop. Dynamic calibration of sensors generally from the production and use of two aspects. For manufacturers, can be adjusted to the analog filter made of special chips, sensors and their amplifier circuits are conveniently packaged together to form a single unit. This will radically improve the dynamic characteristics of the sensor from a hardware point of view. Its advantage is that the overall performance of the sensor can be improved, but also fast computing speed, small size, can achieve rapid response and high resolution. If the user uses the sensor dynamic performance deterioration, and then take the dynamic compensation analog filter method is unlikely. In this case, only through the use of computers, software methods to improve the dynamic performance of the test system. By writing a simple compensation digital filter program, it is possible to improve the dynamic performance of the entire channel without adding hardware. Dynamic calibration of sensors can be performed in both the time and frequency domains. As most of the sensor dynamic calibration is carried out in the time domain, such as the temperature sensor with a laser for dynamic calibration, with a laser tube to do the dynamic calibration of the pressure sensor, with the hammer device to do the dynamic calibration of the acceleration sensor and so on. In any case, the calibration methods are different for different sensors.
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