用于电磁法观测系统开机自检的信号发生器实现方法

严发宝; 柳建新; 苏艳蕊; 韦艳刚; 郑翾宇

doi:10.6038/cjg20171122

用于电磁法观测系统开机自检的信号发生器实现方法

- 1.
  山东大学(威海)机电与信息工程学院, 山东威海 264209
- 2.
  中南大学地球科学与信息物理学院, 长沙 410083
- 3.
  有色资源与地质灾害探查湖南省重点实验室, 长沙 410083
- 4.
  山东大学空间科学研究院, 山东威海 264209
基金项目:
国家科技基础性工作专项（2013FY110800），国家自然科学基金（41674080，41574123），中国博士后科学基金资助项目（2016M600538），山东省自然科学基金（ZR2017PD010，ZR2017PA004）资助

详细信息

作者简介:
严发宝, 男, 1985年生, 讲师, 博士, 研究方向为地球物理仪器与观测技术, 信号获取与嵌入式实时并行处理技术.E-mail:hjc-8555@sdu.edu.cn

通讯作者: 柳建新, 男, 1962年生, 湖南岳阳人, 教授, 博导, 现主要从事电磁法理论与应用研究工作.E-mail:ljx6666@126.com

中图分类号: P631

收稿日期: 2016-12-23

修回日期: 2017-08-22

上线日期: 2017-11-05

A realization of signal generator used in boot-strap self-test of electromagnetic prospecting systems

- 1.
  School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai Shandong 264209, China
- 2.
  School of Geosciences and InforPhysics, Central South University, Changsha 410083, China
- 3.
  Hunan Key Laboratory of Non-ferrous Resources and Geological Hazard Detection, Changsha 410083, China
- 4.
  Institute of Space Sciences, Shandong University, Weihai Shandong 264209, China

More Information

Corresponding author: LIU Jian-Xin, E-mail: ljx6666@126.com

Received Date: 23 December 2016

Revised Date: 22 August 2017

Available Online: 05 November 2017

摘要

摘要:
针对电磁法观测系统在使用过程中的开机自检要求，分析常用测量系统及地球物理仪器的检测信号特征，通过对已有机制进行研究和对比，结合现有信号产生电路的优势，提出一种功耗低、精度高、设计简单的自检信号发生器实现方案.基于该方案设计了一套实现电路，其以CPLD为核心，由精密参考电压源、模拟开关及运算放大器等器件构成，并对该电路进行仿真与测试.通过系统稳定性分析，采用波特图与奈奎斯特图表明信号发生电路的稳定性符合设计要求.经仿真与测试，能够通过换挡开关产生幅值为20 μV~2 V、频率范围在1 Hz~100 kHz的自检脉冲信号，频率稳定在1%，重复测试相位稳定度小于1.5%，幅值误差可以优化到1%以内，且能通过其稳定的谐波分量来获取该系统带宽更宽的通道测试响应.测试结果表明，该自检信号发生器电路实际功耗小于0.3 W，20 μV~2 V幅值范围和1 Hz~100 kHz频率范围内性能指标的测量结果和仿真结果相符，并成功应用于某监控系统.利用该信号发生器电路实现自检具有操作方便、成本低、易于设计等优点，能够有效的弥补其它自检模式的缺陷.
- 观测系统 /
- 自检信号 /
- 低功耗 /
- CPLD
Abstract:
To meet the boot-strap self-test requirements of electromagnetic prospecting systems, the characteristics of self-test signals of commonly used geophysical instruments and measurement systems are analyzed. Through doing comparison and analysis on existing mechanisms, a novel method is proposed with low-power consumption, high precision, as well as easy realization. A set of implementation circuit is designed and simulated. The circuit is shown to have a strong stability on the basis of Bode and Nyquist diagrams. The simulation and test results show that a self-test pulse with a range of 20 μV~2 V amplitude and 1 Hz~100 kHz frequency can be generated through switches. And the signal frequency stabilizes at 1%; phase stability is no more than 1.5% through repeated test, and amplitude error can be optimized to less than 1%. Using the stable harmonic component of the self-test pulse signal, a response in wider band of the measurement system can be obtained. The practical application demonstrates that the boot self-test model has a power consumption less than 0.3 Watt; and an amplitude between 20 μV and 2 V, and frequency range of 1 Hz~100 kHz. This is consistent with the simulation. The self-test model is applied to a monitoring system. The model has the advantages of stable performance, convenient operation, low cost, and easy-to-design. It can improve present self-test models.
- Prospecting system /
- Self-test signal /
- Low power /
- CPLD

HTML全文

图 1

电磁法观测系统自检原理(以两通道为例)

Figure 1.

Self-test principle of electromagnetic prospecting systems(2 channels for example)

下载: 全尺寸图片幻灯片

图 2

电磁法观测系统自检模型

Figure 2.

Self-test model of electromagnetic prospecting systems

下载: 全尺寸图片幻灯片

图 3

仿真与实验电路

Figure 3.

The circuit of simulation and experiment

下载: 全尺寸图片幻灯片

图 4

电路的幅相波特图

Figure 4.

The Bode diagram

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图 5

电路的Nyquist图

Figure 5.

The Nyquist diagram

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图 6

自检电路噪声谱图

Figure 6.

The noise spectrum of the self-test circuit

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图 7

100000 Hz的仿真结果

Figure 7.

Simulation results of 100000 Hz

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表 1

自检测试结果

Table 1.

Test results

f/Hz	衰减系数/V					频率测试/Hz	相位误差/%
f/Hz	1	0.01	0.001	0.0001	0.00001	频率测试/Hz	相位误差/%
1	1.989	0.01987	0.001988	0.000198	0.000017	1	0.000003
10	1.995	0.01997	0.001996	0.000201	0.000018	10	0.00001
1000	1.994	0.01998	0.001998	0.000203	0.000019	1000	0.0012
50000	2.001	0.02010	0.002011	0.000202	0.000024	50000	0.5
100000	2.032	0.02023	0.002033	0.000206	0.000023	100000	1.2

下载: 导出CSV

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