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文档 几种传感应用及信号放大方案分析 (文档下载)
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几种传感应用及信号放大方案分析 (文档下载)

几种传感应用及信号放大方案分析 (文档下载) by 呼啦啦

在高性能数据采集系统的设计中,人们可能很少注意到,实现性能目标的最大障碍通常出现在模数转换器之前的信号输入通道。在进入复杂的混合信号电路之前,小信号处理电路非常关键。在小信号处理电路中,由放大器带来的噪声是不可避免的,事实上这将决定系统可能实现的最佳信噪比。在本文中,我们将以称重计和温度测量为应用实例,讨论在测试应用中如何通过高精度放大器提高测量精度的方法。 

应用实例分析 

1. 称重计应用 

称重计应用在从浴室到工厂车间的各种场合中,满量程从小于250磅到上千吨。称重计都是基于薄膜金属应变片加上精心设计的金属杆结构,这些应变片连接成传统的电桥结构以实现最大的灵敏度。它通常可以提供1~4mV/V的满量程输出,而采用5V激励的最大输出信号就是20mV。 

在1盎司分辨率的高性能测量条件下,要显示多达1吨(2000磅)的重量量程,我们将需要超过30,000个计数。为了在这个分辨率获得精确的测量,需要一个可以提供125倍信号增益的放大器将A/D转换器的20mV的输出提高到2.5V,而且环路增益需要超过30,000,以保证满足其分辨率的线性度。 

2. 温度传感器 

高精度温度测量是高分辨率数据转换器十分普通和迫切需要的另一种应用。在大多数情况下,所选用的传感器是热电偶。K型比例系数(由一片镍络合金和一片镍铝合金接合形成)为每度大约40uV,而S型(由铂铑合金和铂接合形成)的输出大约为每度10uV。在测量范围内必须对非线性误差进行校正非常重要,这使测量工作进一步复杂化。在使用热电偶时还会遇到其它电路问题,如热电偶的连接需要保护电路等。 

在整个测量范围内,热电偶的输出通常可以达到20mV到50mV,或更高。在使用K型接点的情况下,在1,000度范围内获得0.1度分辨率的测量精度(或者是10,000个计数),使满量程测量等于40mV似乎简洁当的方法。其他误差包括运算放大器的输入漂移和0.25至0.5度的热电偶非线性误差。 

3. 热电堆 

热电堆(thermopile)是热电偶的一个变种,它由若干薄膜热电偶接点层组成一个传感器堆,其每个金属接线对都是由一个隐藏的“冷”边和一个暴露在入射光的“热”边组成。它可用来进行激光功率、热和火焰检测测量。满量程输出通常不到1mV,10万分之一满量程的测量光输出相当于不到10毫微伏。对于这种应用,找到一个低成本、高增益、低噪声和低漂移放大器将是一个很大的挑战

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