| The technology of sensors is one of crucial components of the modern information technology. Sensors are the interface of the studied object and the information system, and also the window of the system to acquire and detect information. Magnetic sensors are an important branch that can be used to detect the non-electronically characteristics through the magnetic field. The InSb Intellectualized magnetic Coder sensor in this paper is designed for the measurement of the position of object and the angular velocity of object. Through the sensor, the information of the position and the angular velocity are changed to electric pulse which can provides to other second instruments.Firstly, the paper introduces the theory of the InSb magnetosensitive characteristics. And the distributing of the magnetic field of magnetic drum of magnetic encoder is calculated, and the gap between magnetic drum and head affecting magnetic encoder's function is analyzed, the velocity of magnetic drum affecting magnetic encoder's function is analyzed. The design is based all these analyzes. In paper we designed the processing circuits of magnetic encoder, designed the magnified circuit, the signal collection circuit and the D/A conversion circuit are designed. Then magnetic encoder can output two different type signals: digital signals and analog signals, the two type signals are corresponding.Some property and working parameters about the encoder are tested. The result indicated that: (1) The objective of design is achieved, the encoder can output two type signals simultaneously. (2) The encoder can work properly from -10 C to 70 C, the output signals are stable. (3) The encoder can work stably in a long time, so this encoder can be put into practice. (4) Compared with other angle sensors, the encoder has some advantages, good temperature stability, the linearity of the output analog signals is good, and the sensitive is easy to adjust. In sum, the encoder can be put into use as a new type angle sensor. |
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