Description: 本文提出了采用数字式正交检波技术得到I、Q通道的方法，以此来测量相位，获取传感信息，很好地解决了在声表面波无线传感器测量系统中测量时间差的精度低的问题。-This paper presents the use of digital quadrature demodulation technology I, Q-channel approach, as a means of measuring phase, to obtain sensor information, a good solution to a surface acoustic wave in wireless sensor measurement system to measure the time difference the problem of low accuracy . Platform: |
Size: 290816 |
Author:关成 |
Hits:
Description: TPD开发，触摸屏的主要三大种类是：电阻技术触摸屏、 表面声波技术触摸屏、 电容技术触摸屏。 每一类触摸屏都有其各自的优缺点，要了解那种触摸屏适用于那种场合， 关键就在于要懂得每一类触摸屏技术的工作原理和特点。-TPD development, touch-screen main three types are: resistance touch screen technology, Surface Acoustic Wave touch screen technology, capacitive touch screen technology. Each type of touch screen has its own strengths and weaknesses, to understand the kind of touch screen applied to the kind of occasions, the key is to know how each type of touch screen technology, working principles and characteristics. Platform: |
Size: 6144 |
Author:彭会 |
Hits:
Description: MEMS中的常用材料参数，这些参数在MEMS器件设计仿真过程经常会被用到。-MEMS materials commonly used in the parameters, these parameters in MEMS device design and simulation process will be used frequently. Platform: |
Size: 54272 |
Author:吴校生 |
Hits:
Description: LCD触摸显示屏控制定位系统:LCD触摸屏也变得普及，并逐渐成为当今的主流配置。触摸屏分为电阻、电容、表面声波、红外线扫描和矢量压力传感触摸屏等，其中使用最多的是四线或五线电阻触摸屏。四线电阻触摸屏是由两个透明电阻膜构成的，在它的水平和垂直电阻网上施加电压，就可通过A/D转换面板在触点测量出电压，从而对应出坐标值。-LCD touch screen control positioning system: LCD touch screen has become popular, and has gradually become the mainstream of today s configuration. Touch screen is divided into resistors, capacitors, surface acoustic wave, infrared scanning and vector pressure sensor touch screens, which use the most is the four-or five-wire resistive touch screen. Four-wire resistive touch screen is made up of two transparent membrane consisting of resistance, in its horizontal and vertical line resistance imposed voltage, can be through the A/D conversion panel measured in the contact voltage, which corresponds to the coordinate values. Platform: |
Size: 10240 |
Author:刘方 |
Hits:
Description: 在声表面波的研究中，采集数据后进行分析用的M程序。-Surface acoustic wave in the study, collected data for analysis after the M procedure. Platform: |
Size: 6068224 |
Author:huwenguo |
Hits:
Description: 我国目前对噪音污染的治理方法主要有两种：一种是将水泥路
面的改柏油路面第二种是在距离住宅窗户较近的道路两侧安装隔音
屏障。但效果均不理想。路面改变只可降低汽车行驶摩擦声的3～5
分贝左右。至于安装隔音屏障．由于声波的衍射特性，声音的传播可
以跨越隔音屏障，在中频，高频声波传播中，遇到难以穿透的障碍物
时，背面就有一个声波微弱的影区。所以此举只对相近楼层有所缓
解，对更高楼层的住户而言，效果并不明显-Our current treatment methods for noise pollution, there are two: one is the change of the cement road asphalt surface of the second is near the road at a distance of residential windows installation of noise barriers on both sides. But the results are not satisfactory. The road surface changes can only be reduced by about 3 to 5 db of the friction sound of car driving. As for the installation of noise barriers. Due to the diffraction characteristics of the acoustic sound propagation across the noise barriers encountered impenetrable barrier in the intermediate frequency, high frequency sound wave propagation in the back there is a weak acoustic shadow zone. Eased so move only close to the floor tenants on higher floors, the effect is not obvious Platform: |
Size: 65536 |
Author:cuiguangyu |
Hits:
Description: 声表面波传感器的综述,系统的介绍了声表面波的形成机制，是学习其最好的材料-Surface acoustic wave sensor, the system introduced the formation mechanism of surface acoustic waves, is to learn the best materials Platform: |
Size: 172032 |
Author:杨建 |
Hits:
Search - Surface acoustic wave