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The output of the sensor signals and processing circuit

by:HENGXIANG     2020-11-06
Sensor is a kind of testing device, can feel the measured information, and will feel information, according to certain rules transform into electrical signal or other required information in the form of output, in order to meet the needs of information transmission, processing, storage, display, record and control requirements. The sensor output signal is generally weak, The mV, uV) , sometimes with other signals ( Interference or carrier) , therefore, in the process of transmission, need to be based on specific characteristics of the sensor output signal and the backend system requirements, to various forms of the sensor output signal, such as impedance transformation, level conversion, shielding isolation, amplification, filtering, modulation, demodulation, A/D and D/A, etc. , should also consider during transmission can be affected by the interference, such as noise, temperature, humidity, magnetic field, some measures are taken, the sensor signal processing circuit of the content must be based on the characteristics of the measured object and environment condition to decide. The content selection of sensor signal processing circuit problems which should be considered mainly includes: 1. The sensor output signal form, it is analog signal or digital signal, voltage or current. 2. Form of sensor output circuit, output single-ended or differential output is 3. Sensor circuit output power, voltage or power, size of the output impedance. 4. The characteristics of the sensor, such as linearity, signal-to-noise ratio and resolution. The development of electronic technology and the application of micro processing technology, now many sensors have been configured in the part of the processing circuit, Or configuration has a special processing circuit) , which greatly simplifies the design and maintenance personnel of the technical difficulties. Such as reflection type photoelectric switch sensor integration logic control circuit; Pressure sensor output connection after the special interface circuit can be directly transported to A/D; Photoelectric coding sensor output is 5 v pulse signal, can be directly transmitted to the computer. Shanghai electronic products research and development production of magnetoelectric encoder is a kind of magnetoelectric sensor is a cost-effective sensors, it has the following advantages: performance not easily affected by dust and condensation; Its simple and compact structure, non-contact, long life, high and low temperature resistance, resistance to vibration, fast response speed. Looking for sensor manufacturer is looking for electronic.
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