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摘要风速是反应气象情况的重要参数，因此快速准确的测量出风速具有重要的实际意义。风速测量方法有很多种，本文采用最经典的测量方式：超声风速传感。它具有测量精度高，使用寿命长，可靠性强等优点。 本文通过阐述风速测量的分类引出了超声风速传感这一测量方法，介绍了时差法超声风速测量的基本原理，并对风速测量的应用领域和研究发展做了综述。根据时差测量原理，设计了发射和接收电路，通过仿真软件对电路进行了试验和优化。其重点在于对电路中高频信号的处理，由于电路中存在放大功能，运放选择时要注意其工作频率。第三章介绍了PCB 板的设计，PCB 板设计重点在于器件封装选择和 PCB 板器件放置。 为了对设计电路进行验证，实验测试了电路性能，验证了电路正确性。 27650
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毕业论文关键词 超声风速测量 仿真 PCB 高频
Title The circuit design and experiment of ultrasonic wind velocity measurement system
Abstract The wind speed is an important parameter for the reaction of the meteorological situation, so fast and accurate measurement of wind speed, it has important practical significance. There are many kinds of wind speed measurement method, this paper uses the classic measurement methods: ultrasonic velocity sensor. It has the advantages of high measuring precision, long service life, high reliability. Through elaborate wind speed measurement classification leads to the ultrasonic wind sensor and the measurement method, introduces the basic principle of time difference method of ultrasonic wind velocity measurement, and made a review on the measurement of wind speed applications and research and development. According to the principle of time difference measurement, the transmitting and receiving circuit are designed, and the circuit is optimized by simulation software.The emphasis is on the processing of high frequency signals in the circuit, due to the circuits in the presence of amplification function, the op amp to pay attention to the operating frequency. The third chapter introduces the design of PCB board, PCB board design focuses on device package selection and PCB board device placement. In order to verify the design circuit, the circuit performance is tested and the correctness of the circuit is verified. Keywords Ultrasonic wind velocity measurement Simulation PCB High frequency
目 次
1 引言 . 1
1.1 风速测量系统分类和特性 1
1.1.1 风杯测试方法 1
1.1.2 热式风速测试方法 . 1
1.1.3 叶轮式风速测试方法 1
1.1.4 皮托管式风速测试方法 . 1
1.1.5 基于MEMS 加工技术的微型热流速传感器 2
1.1.6 热球式电风速计 .. 2
1.1.7 超声风速传感器 .. 2
1.2 超声波风速测量系统的基本原理[1,2] 2
1.3 风速测量系统的应用 .. 3
1.4 风速测量系统的发展历史及现状[3] .. 3
1.5 小结 . 4
2 超声风速测量电路的设计与仿真 5
2.1 引言 . 5
2.2 超声风速测量系统的电路设计与工作原理 . 5
2.2.1 超声风速测量系统的电路设计 . 5
2.2.2 超声风速测量系统的工作原理 . 6
2.3 超声风速测量系统的仿真电路图 .. 6
2.3.1 发射电路设计 7
2.3.2 触发电路设计 7
2.3.3 接收端放大电路设计 8
2.3.4 接收端滤波电路设计 9
2.3.5 接收端整形电路设计. 10
2.4 超声风速测量系统的电路仿真分析 .. 11
2.4.1 发射电路仿真分析 .. 11