段近红外光的吸收和散射效应最小，可穿透更深层的组织；⑵由于生物组织对此波 段近红外光的自发荧光较弱，信背比（Signal-to- Background Ratio，SBR)相对高。肿瘤细胞特异蛋白可用NIR荧光标记，应用特定波长的光源（激光或白光）NIR荧光，特定波长的近
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CLIA using acridinium ester derivatives as chemiluminescent label has advantages of low background and high signal-to-noise ratio.
以吖啶酯衍生物为发光标记物的CLIA的特点是：自然本底低和信噪比高。
By means of the principle of correlation analysis, this paper introduces an approximate method for estimating signal-to-noise ratio on random noise background.
本文利用相关分析的原理，提出一种在随机噪音的背景上估算信噪比的近似方法。
However, in respect of a vibration acceleration signal, the signal to noise ratio (SNR) is often so small that the periodic impulse component is submersed in its intense background noises.
通常检测的机械振动加速度信号，由于信噪比太低，即使存在周期性的冲击分量也往往被淹没在强的背景噪声之中。
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