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本文用均分原理计算了光纤干涉传感器的平均固有熟噪声。众所周知,波动力的频谱密度是电阻器热电噪声的一个机械当量。高敏感的光纤干涉型地震传感器中由于光电干涉型解调器的相位噪声来源于波动力所产生的相位噪声,从而限定了最低探测极限。这种效应如同转换器增加光杠杆率从而限制了“反射检流计”极限灵敏度。为了减少传感器噪声,在测振仪中传感器宜工作在谐振频率以上,而在加速度计中宜工作在谐振频率以下。工作在谐振频率附近的时间取样加速度计必然导致折迭噪声,从而增大噪声电平。
In this paper, the average inherent harmonic noise of optical fiber interference sensors is calculated by using the principle of equalization. It is well known that the spectral density of wave power is a mechanical equivalent of the thermoelectric noise of a resistor. Highly sensitive fiber-optic interferometric seismic sensors limit the minimum detection limit because the phase noise of the optical interferometric demodulator is derived from the phase noise produced by the wave forces. This effect limits the sensitivity of the “reflective galvanometer” as the converter increases the optical leverage. In order to reduce the sensor noise, the sensor should work in the vibrometer above the resonant frequency, and in the accelerometer should work below the resonant frequency. Time sampling accelerometers operating near the resonant frequency inevitably lead to folded noise, thereby increasing the noise level.