| 贺洪斌,晁永胜,汪正波.声波远探测测井仪发射电路的优化实现*[J].,2018,37(2):281-286 |
| 声波远探测测井仪发射电路的优化实现* |
| Optimization of the transmitting circuit of acoustic remote detecting tool |
| 投稿时间：2017-02-10 修订日期：2018-02-26 |
| 中文摘要: |
| 声波远程探测需要低频大功率发射和宽频带接收技术，从而使得仪器看得远、看得清。目前，采用单脉冲的激励方式，需要增加发射脉宽或者提高发射电压来提高发射能量。而增加发射脉宽会降低成像分辨率，提高发射电压又对发射换能器提出了新的挑战。该文在现有换能器基础上，提出并采用线性调频脉冲信号激励换能器的方法，以提高探测距离和精度。具体地，该文采用DDS技术产生线性调频脉冲信号并由FPGA实现；采用高效的D类放大器来最大化功率；采用一个全桥电路实现了两路发射控制。测井表明，设计的电路能稳定有效地工作，相对于单脉冲发射电路而言，它得到了更好的成像效果图像。该文工作为远程声波探测测井仪器的自主研发提供了一种技术参考。 |
| 英文摘要: |
| Acoustic remote detecting tools requires low-frequency and high-power transmission and wide-band receiver technology, which can make the tool see farther and see more clearly. In order to increasing transmitting energy while using single-pulse signal to stimulate the transmitting transducer, it’s necessary to increase the pulse width of the excitation signal or increase the transmitting voltage. However, the imaging resolution will be decreased while increasing the pulse. And increasing the voltage will give more challenge for transducers. This article proposed a method of using linear frequency modulated pulse signal to drive transducers which will improve the detection range and precision. Practically, using DDS to generate this chirp signal and implemented by FPGA; using high efficient Class D amplifier to maximum the energy; using a full bridge circuit to achieve the two-way emission. Field logging shows that the circuit can work stably and efficiently, which gets better imaging resolution compared to single pulse transmit circuits. This article provides a technical reference for the independent and development of acoustic remote detecting tools. |
| DOI：10.11684/j.issn.1000-310X.2018.02.015 |
| 中文关键词: 横波远探测 线性调频脉冲 直接数字式频率合成 D类功放 |
| 英文关键词: S-wave remote detection, Linear frequency modulated chirp, Direct digital frequency synthesis, Class D amplifier |
| 基金项目:国家自然科学基金项目 (11404370, 11734017), 国家重大科研装备研制项目 (ZDYZ2012-1) |
|
| 摘要点击次数: 2407 |
| 全文下载次数: 2714 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
