Magnetic Induction Sensor Parameter Of Loop And Study Of Its Interface Circuit

Electromagnetic method is a physical detecting method based on the electromagnetic effect.It is valid in exploring the resources and environments from near the earth's surface down to the underground several thousand meters deep and is nonreplaceable in the region of the underearth resource exploration. Inductive magnetic sensor was developed abroad in the ealiy. In recent years, several major geophysical equipment manufacturing companys in Europe and the United States has put up amass of exploringand researches on magnetotelluric sounding in the structural design of products,craftwork of produce,material of magnetism and selection of electron devices and so on in order to improve magnetotelluric sounder for the performance of equipment. Nnew equipments come forth constantly.The price of produyct is valuableness abroad and export of it was confined to us.In our country electromagnetism exploration work was carried out in the late 1960s and got behind in development has restricted the development of our electromagnetic equipments.Inductive magnetic sensor includes loop and interface circuit.the investigation of interface circuit and parameter of induce loop is the part of the core in the process of the investigation of inductive magnetic sensor.Inductive magnetic sensor is based on Faraday's law of induction. It is the most convenient and simplest receiver in measuring the change of electromagnetic field, with merits of simple manufacture technique, small volume, low power loss, easy utilization, stable performance, and wide-range frequency. It is the most widely used magnetic sensor.In order to satisfy the need of item ,This paper presents the investigate of the interface circuit and parameter of induce loop. Finally,I accomplish the inductive magnetic sensor which achieve the aim.The total paper splits into six parts and was introduced as follow:Chapter1: Summarizes the common magnetic sensors used in the earth electromagnetic measurement. Analyses the status of the inductive magnetic sensors in China and foreign countries. Presents the meaning and the content of this work.Chapter2: Summarizes the performance ,kind and main range of application of common magnetic sensors and analysises Magnetic measurement principle and working conditionsof the induce loop.Chapter3: Introduces compose of inductive magnetic sensors,parameter and factor which influences the parameter,puts forward the design project of induce wide loop.Confirms the principle of selection of material of magnetic core. Introduces the amorphous alloy magnetic core and analyses the origin of the loss. Bring forward the measure to reduce the loss.Chapter4: Analyses the property of the induction coil circuit. Presents the scheme of frequency compensation reference from traditional method to meet the needs for wide frequency frequency bandand high sensitivity. Designs and analyses the amplitude-frequency characteristic.Chapter5: Lists the necessary equipment basis the need of testing. Presents the condition for sensor test.Does lots of experiment in the condition of changing some parameter such as measure of induce loop and so on and analyses the parameter of induce loop. Analyses the generating method of standard magnetic field signal. Tests the amplitude-frequency characteristic using the ratio of the frequency spectrum and the inter-frequency frequency spectrum. Tests the sensitivity by applying sinusoidal signal to the helix coil with known magnetic field coefficient. Depicts the curve of sensitivity.Chapter6: Concludes this paper. Points out the work that needed improvement and gives further considerations.