原有"电子测量实验"课程存在验证性实验多、综合性设计型实验少、与前沿理论联系不紧密、实验平台缺乏等问题,无法满足课程培养目标.针对上述问题,构建了"基础实验+综合拓展+科研引导"的递进式多层次实验课程体系;引入翻转课堂提升实验教学效果;研制开放式实验教学平台,支撑多层次个性化课程内容.应用表明,该课程体系提升学生应用前沿技术解决实际问题能力,锻炼学生创新思维.

为解决现有电子测量实验教学中实验平台无法满足多层次人才培养的问题,结合测控技术与仪器专业电子测量实验教学目标与要求,引入电子测量前沿技术,研制开发一套与理论教学、工程实践紧密结合的实验教学平台.该平台采用模块化、开放式设计思路,包括基于DDS(Direct Digital Freqiaency Synthesizers)技术的信号源模块、带通滤波器模块、交流电压参数测量模块、数字频率计模块及供电、接口模块等,为学生验证理论知识提供实践操作平台.同时,为综合性、设计性实验提供开放式的硬件平台和资源.实践应用表明,该平台的应用不仅使学生更加深入了解掌握电子测量理论知识,同时也锻炼学生的创新思维和实践动手能力,实现了高水平、多层次人才培养的目标.

大地电磁信号具有信号弱、频带宽的特点,野外获取的电磁数据质量极易受强人文干扰而下降.为提高采集数据的信噪比,需要采取合理的去噪方法对数据进行降噪处理,为此,采用小波变换方法有效压制部分人文噪声.小波变换具有"时频"联合分析的功能,可以对信号进行多尺度细化分析,非常适合处理频率成分复杂的大地电磁数据.通过对小波变换原理进行分析,结合野外电磁数据的信号与噪声特点,选择合理的母小波、分解层数、阈值等小波变换参数,针对不同的人文噪声干扰采用不同的参数组合进行处理.实验结果表明,野外电磁数据经过小波变换去噪后信噪比有效提升,为后续视电阻率计算提供了高质量的时间序列.

吉大仪电开放实验室一直在探索实践创新能力培养新模式,寻求适合工科类本科生的实践类教育方法,改变实验室只提供实验设备和场地的一贯模式,发挥理论课教师、实验教师与科研一线教师的各自优势,加入到开放实验室实践教育中,依托学生兴趣、竞争机制、交流平台、能力培训、实践创新等五维一体的模式进行本科生实践创新能力培养.5年的实践逐步完成了高素质创新性人才培养模式的构建,为大学生创业实践活动的开展奠定了坚实的基础.

为满足电子类实验教学对示波器功能及性能指标的要求,设计了参数可灵活设定、应用场所不受空间限制的无线示波器设备.系统以FPGA(Field Programmable Gata Array)作为主控制器用于信号的处理,硬件部分主要由信号调理模块、A/D(Analog-to-Digital)转换模块、无线传输模块、电源模块组成,上位机基于Labview可视化编程软件设计.硬件采集处理部分与软件客户端通过WIFI技术进行参数与信号传输,使观测效果不受被测点空间位置的限制.系统可同时实现4路信号的采集与无线观测.经测试,该系统最高可分辨700 kHz的波形特征,可准确测试2 MHz的信号频率与幅值.该系统与实验室现有传统示波器互为补充,可满足本科实验教学及课外实践的设备要求.

Noise interference, especially from human noise, seriously affects the quality of magnetotelluric (MT) data. Strong human noise distorts the apparent resistivity curve, known as the near-source effect, causing poor reliability of MT data inversion. Based on analyzing the frequency characteristics of human noise resulting from the surrounding environment, a new wavelet-based denoising method is proposed for both synthetic and real MT data in this paper. The new technique combines multi-resolution analysis with a wavelet threshold algorithm based on Bayes estimation and has a remarkable effect on denoising at all band frequencies. The multi-resolution analysis method was employed to reduce long-period noise, and a wavelet threshold algorithm was used to eliminate strong high-frequency noise. In this research, the improved algorithm was assessed via simulated experiments and field measurements with regard to the reduction in human noises. This study demonstrates that the new denoising technique can increase the signal-to-noise ratio by at least 112% and provides an extensive analysis method for mineral resource exploration.

The terahertz time domain spectroscopy system is applied to the undergraduate experimental teaching to familiarize the students with the use of such system ,improve their hands-on practical ability and stimulate their interest in scientific research .Through the combination of cutting-edge scientific research instruments and equipment with the undergraduate experimental teaching ,the cultivation of research-oriented and innovative talents is promoted .

针对现有升压变换电路升压能力有限、纹波大和效率低等问题,设计并实现了一种基于开关电容单级网络的电源升压变换器.通过实验测取开关电容单级网络升压变换器在不同占空比条件下输出电压随输入电压变化的数据绘制特性曲线,将不同条件下的升压电路效率计算出来,并与开关电容电路相关参数的理论结果进行对比分析.实验结果表明,随着输入电压的升高,基于开关电容单级网络的升压变换器的效率稳定在80％以上,在电路效率方面基本符合了设计的要求,与传统boost升压变换器装置的效率相比更具有优势.

The output performance of residence times difference (RTD) fluxgate may vary under different driving conditions (driving currents and frequencies) and core materials. To optimize the RTD fluxgate and simplify its design process, an analytical model is employed to select the parameters and identify the effective factors that dominate the performance. The dynamic permeability parameters (P i ), which reflect the changes in the magnetization curve, are mathematically analyzed in detail. The linear variation functions of P i in different driving conditions are fitted by using the dynamic arctangent hysteresis model. Consequently, the selection of driving conditions and core materials, which are assessed by comparing the experiment and simulation results, has an important role in achieving the optimal output performance of the RTD fluxgate.

设计了一种可自动定位的智能防盗车锁跟踪系统,以STC12CSA60S2单片机作为控制器,辅以液晶显示屏(LCD)显示模块、声光报警模块、全球移动通信系统(GSM)通信模块、GPS定位模块、加速度模块等功能模块.系统可以实现无人状态下的声光防盗功能,同时在被盗后可以进行定位并通过GSM通信模块短信通知车主.测试结果表明:定位误差小于5m,信息更新速度不低于0.2次/min.

Magnetotellurics (MT) is normally applied for mineral exploration, because of its low cost and deeper penetration, as well as high resolving power in horizontally. However, the quality of MT data is affected by the human noise seriously around the mine area, which result in a unreliable result of inversion and even a wrong explanation. Therefore, it is important to remove the various disturbance. The multi-resolution algorithm (MRA) has domination in terms of making a high resolution for the frequency domain of MT data, and the wavelet thresholding algorithm (WTA) is at an advantage when removing the high frequency noise. A combined wavelet transform algorithm based on MRA and WTA is proposed. db3 wavelet is adopted in processing. Baseline drift and periodic noise of square wave can be removed by multi-resolution algorithm. Bayes estimation combined with improved threshold function which based on algorithm of wavelet threshold value is used to eliminate the impulse noise, triangular waveform as well as other forms of high frequency noises. Processing case indicated that the quality of the processed data, including the time series data and apparent resistivity curves, is improved significantly. Meanwhile near-source effect, which is caused by human interference, is suppressed effectively.

大学生电子设计竞赛培训与开放实验室管理模式相结合,从学习、培训、实践到竞赛过程连贯在一起,探索提高实践能力的培训模式.在开放实验室中营造出科技创新学习氛围,从基础培训、作品设计、优化设计融入到实践教学和实验教学中,从大一开始渗透创新和实践思想,经过理论课、实验课与实践培训,最终在电子设计竞赛中洗礼,培养出创新性人才.实践证明我学院培养的学生不仅能在竞赛中获得好成绩,且因实践能力的突出,在以后的科研和工作方面能如鱼得水.

In order to adjust the flight attitude of the quad-rotor,an attitude data processing joint algorithm based on Kalman and DMP( Digital Motion Processing) filter was adopted, and PID( Proportion-IntegrationDifferentiation) algorithm was used to control its flight attitude. Based on the hardware platform,the dynamic model of the aircraft was established and the parameters of Kalman filter and PID controller were debugged. The flying experiment shows that after using the control algorithm,the control system can quickly adjust the flight attitude offset to control the quad-rotor effectively.

With the progress of human society,population density is on the increase,and the safety in buildings has drawn great attention.It is of significance to develop a disaster rescue system for any unexpected incident.In order to monitoring the visitors' flow rate in buildings,a novel system based on embedded system,photoelectric detection technology and ultrasonic ranging technology was designed by using data processing system of multi-sensor.The test result shows that the system can precisely monitor visitors' flow rate and can be applied universally.

Based on the core hysteresis features, the RTD-fluxgate core, while working, is repeatedly saturated with excitation field. When the fluxgate simulates, the accurate characteristic model of the core may provide a precise simulation result. As the shape of the ideal hysteresis loop model is fixed, it cannot accurately reflect the actual dynamic changing rules of the hysteresis loop. In order to improve the fluxgate simulation accuracy, a dynamic hysteresis loop model containing the parameters which have actual physical meanings is proposed based on the changing rule of the permeability parameter when the fluxgate is working. Compared with the ideal hysteresis loop model, this model has considered the dynamic features of the hysteresis loop, which makes the simulation results closer to the actual output. In addition, other hysteresis loops of different magnetic materials can be explained utilizing the described model for an example of amorphous magnetic material in this manuscript. The model has been validated by the output response comparison between experiment results and fitting results using the model.

The magnetic field produced by the electriferous solenoid was regarded as even magnetic field in the sensitivity test of inductive magnetic sensor.But this presupposition will bring on a result that the metrical sensitivity is less than the real sensitivity.The non-uniformity of the magnetic field produced by the solenoid has been analyzed through the theoretics and the emulation experimentation.Then the mean method was put forward to process the non-uniformity.Compared the metrical sensitivity with the theoretical sensitivity,the conclusion was given:the error between the metrical sensitivity processed by mean method and the theoretics sensitivity is less than that of the un-processed metrical sensitivity.

An experimental teaching system for intelligent instrumentation was designed in order to meet the requirement of experimental teaching,which was successfully applied to the undergraduate teaching.The system was composed of a data acquisition system and a data processing system with SST89V564RD single-chip microcomputer as the processor.The modularized design was adopted in this system,and the single-chip module,man-machine interface module,data acquisition module,and simple signal source module,etc.were included.The signal source can be provided either by the system or by an external signal source.The data acquisition module transmits the data by the serial port,and then the data will be analyzed.In the end,the PC(personal computer) software displays the raw data and the processed data.Experiments proved that the experimental system can satisfy the experimental teaching purpose and runs stably.The most important is that this experimental system can help students understand intelligent instrumentation by doing experiments,and can consolidate what they learned in class.

In the hybrid-source magnetotelluric detection, in order to receive the artificial source electromagnetism signal effectively, the synchronous electromagnetic signal reception programme based on Global Position System (GPS) was put forward. In this paper, the Personal Digital Assistant (PDA) controls the transmitting system to send high-frequency electromagnetic waves with different frequencies. Using the GPS's high-precision time benchmark, the time calibration of the transmitting system and the receiving system was achieved. And the discrepancy of the two system clock was under Is to make sure the transmitting signal received synchronously. The experiment proved that the transmitting signal can be received accurately and effectively by using this program.

Magnetic sensor is widely used in electromagnetic field to get the real weak magnetic field intensity. Because the sensor outputs voltage and the parameter applied in electromagnetic in fact is magnetic field intensity, it should to be known precisely relationship between output voltage of the sensor and the magnetic field, that is to say, the sensor should be calibrated before applied in electromagnetic. When the sensor was calibrated in the past, the exciting signal origin from calibration system was usually sine wave or square wave. In this paper, we bring up a kind of calibration method that the exciting signal is multi-frequency signal. There are some advantages by using the method: First, the exciting signal can be produced easily. Second, the frequency of the exciting signal can be set low as far as possible. Thirdly, the calibration efficiency is improved significantly without effecting calibration precision because of all useful frequency point energy occupying most of total energy of the exciting signal. The result of experiment proves that this calibration method is feasible and high efficiency.