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低频振动传感器应用
发布时间:2014-11-04   点击次数:1774次

 低频振动传感器的低频截止频率

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  传感器的灵敏度,低频噪声特性和动态响应范围

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  为了表明传感器所能测量的zui小信号大部分商业化的加速度计也都提供分辨率或电噪声指标。国内绝大部分传感器的宽带电噪声指标一般都标为20μV,而BW-sensor的宽带电噪声指标已降低到10μV。然而对低频小信号测量来说,仅提供宽频带的电噪声并不能完全反映传感器在低频范围内加速度测量的分辨率;这是因为由内置电路引起的低频噪声大小与频率的倒数成正比,即所谓1/f噪声,当测量频率很低时传感器的电噪声输出按指数幅度增长。所以传感器的低频电噪声的数值与宽带电噪声指标是完全不同的而且频率越低这种差别越明显。因此用于甚低频测量的传感器其分辨率常用传感器输出电噪声的功率谱密度表示。此指标的实用意义是传感器在特定频率下的噪声大小,其单位是一般用μV/√Hz或μg/√Hz来表示。BW-sensor内置电路电噪声功率谱密度的典型值为3μV/√Hz@10Hz。

  传感器的瞬态温度响应对低频测量的影响

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  传感器的安装基座和基座应变对测量的影响

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