基于超微晶合金的传感器噪声匹配变压器设计  

Design of Sensor Noise Matching Transformer Based on Nanocrystalline

作　　者：樊尚春[1] 陶泽辉[1] 邢维巍[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《传感技术学报》2011年第4期513-516,共4页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金仪器专项项目(60927005)

摘　　要：为提高传感器的前置放大器的性能,克服传统变压器对放大器进行噪声匹配带来的不足,提出了采用高磁导率、低矩形比的超微晶合金材料制作噪声匹配变压器的方法。利用高磁导率、低矫顽力、低矩形比及损耗的超微晶合金材料设计用于传感器噪声匹配的变压器,克服传统软磁材料在诸多方面对传感器信号不利影响。从软磁材料特性及变压器等效电路着手进行分析,测试了不同类型的软磁材料对信号的实际影响效果。经测试说明VAC500F材料制作的变压器有着18.6 dB信噪比提高,低于0.1%的总谐波失真以及较高带宽和低损耗的特性,其性能比铁氧体等传统材料更优越,在用于传感器信号检测电路中更具有实用价值。A method to improve the performance of the pre-amplifier for the sensor is introduced.High magnetic permeability,low rectangular nanocrystalline alloy is used to fabricate the noise matching transformer to overcome short-comings of the traditional noise matching transformer amplifier.By using the performance of the nanocrystalline of high magnetic permeability,low coercivity,low Squareness and low losses character,many shortcomings for conventional material are overcome.In order to obtain and test the effect of different types of soft magnetic material to the output signal,this paper analyzes the soft magnetic properties of materials and transformer equivalent circuit.The results of the tests show that the VAC500F nanocrystalline is better than traditional material in performance.It has a close to ideal SNIR（signal to noise improve ratio）of 18.6 dB,has less than 0.1% THD（total harmonic distortion）,and it also has the high band wide the low loss characteristic.It has a better practical value in detecting of sensor.

关 键 词：噪声匹配 信噪比 变压器 超微晶合金 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置] TM271.2[自动化与计算机技术—控制科学与工程]