The Study Of Sensitivity Characteristics For The Magnetostrictive Biosensors

With the rapid development of industry, there is a growing concern to health, people proposed increasingly stringent requirements for the high-precision detection of things seen in life everywhere, such as food, clothing, jewelry, medical equipment and other heavy metal ions, bacteria and other pathogenic.Magnetostrictive biosensors mentioned in this paper were first appeared in the1990s, due to its small size, a fast and convenient detection, small amount of sample taken, and simple sample handling, this kind of biosensors are widely used in chemistry, biology, medicine, etc. many other fields. The proposed magnetostrictive biosensors for detecting the heavy metal ions in this thesis, aims to improve the detection Status quo for heavy metal ions at this stage:high cost, complex sample handling, with long time consume.-Details of the paper are as follows:1、Due to the sensitive material of a sensor is an important element for the sensor signal sensing and conversion, this paper focuses on the sensitive element material used for preparing a magnetostrictive biosensor conducted. Sensitive components are used in the stage of magnetostrictive biosensors amorphous alloy Metglas,2826MB, the sensor light weight, high detection sensitivity. However, such high magnetic energy material synthesis process complexity, higher equipment requirements, thus a higher cost of the material and is not common in the country. FeGa alloys are widely used in the magnetostrictive transducer magnetostrictive materials can, in underwater acoustic transducer sonar showed magnetic-mechanical energy conversion efficiency, high magnetostrictive coefficient excellent a common performance, and easier synthesis, low cost than the amorphous alloy Metglas2826FeGa materials and traditional amorphous alloy Metglas2826MB for magnetostrictive biosensors sensitive materials made research and testing.2、This thesis studied in the two magnetostrictive material respectively: firstly, the theoretical vibration frequency values were calculated using one-dimensional elastic theory Analysis and with the magnetic properties of the two materials and magnetostrictive. Then, the vibration frequencies of the two material Metglas2826MB and FeGa were numerically simulated by finite element simulation software; the number of copper wire-coil turns used in the experimental test, the current value of the excitation on the coil was calculated through the numerical calculations, too.3、Finally, the vector network analyzer was used to detect the two magnetostrictive sensors, the frequency response of the two materials as well as the corresponding quality factor were compared, using the three different media: air, water of alcohol. The feasibility of FeGa material used as the sensitive element material of the magnetostrictive biosensor was verified.