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Forum 为什么要进行信号调理?
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  • Replies 1 reply
  • Subscribers 351 subscribers
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  • 信号调理
  • 传感器
  • 热电偶
Related

为什么要进行信号调理?

Grace
Grace over 14 years ago

各种各样的应用都使用数据采集设备。在实验室,在现场服务,以及在生产车间,这些设备用作通用的测量工具,且很好地适用于测量电压信号。然而,对于许多真实世界的应用,您必须利用传感器测量环境或结构参数,例如温度或振动。这些传感器反过来需要在数据采集设备有效且精确地测量信号之前进行信号调理。信号调理提供了不同于孤立数据采集设备的独特特性,因为它提高了数据采集系统的性能和测量质量。

        为了说明信号调理的必要性,考虑一个热电偶的例子。为了精确地测量热电偶信号,您必须提供放大、滤波、和冷端补偿。放大是必需的因为信号的幅度较小,并且您必须将它放置在与热电偶尽可能近的地方,从而提高信噪比。虽然放大有助于减少信号上的噪声影响,您也必须提供滤波来去除来自于电线和其他电子设备的环境噪声。冷端补偿也是十分必要的,用来补偿那些存在于热电偶测量端和数据采集设备端之间的任何温度差。信号调理的实效就是极大地提高精度。比较25 °C时的热电偶测量结果,一个是使用NI SCXI-1112热电偶信号调理模块,另一个是使用具有一个用于冷端补偿的温度传感器的旋钮终端连接头模块——SCB-68。SCXI-1112模块达到0.3 °C的精度,而SCB-68的精度只有5.0°C。所以,SCXI-1112信号调理模块使得热电偶测量精度比相应的终端模块提高了10多倍,这正是源于预放大,低通滤波,和更为精确的温度传感器。

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  • 志者远翔
    志者远翔 over 14 years ago

    对信号进行处理便于收发转换存储等一些列操作

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