求助荧光探针检测限的计算问题？请教别人后自己搞清楚了。给大家分享一下。a linear relation exists between the MPI(y) and the low concentration (x, 0–50 ppm), as shown in inset of Fig. 3(d). It can be fitted as: y = 0.04x + 2.06.Based on the theory of Martins and Naes [23], the detection limitcan be derived fromthe signal processing performance as describedblow. The sensor noise can be calculated from photocurrent signalsin air without formaldehyde using the root-mean-square (rms)deviation. In Fig. 3(c and d), we took all the data points to obtainthe average value before exposure on formaldehyde vapors.V=(yi ? y)2where yi is the average value fromcalculation and y is the measureddata point. The rmsnoise is calculated asrms2 =V/NwhereN is thenumber of data points used for the average value. The sensor noise is 0.02385 for formaldehyde sensor. According to the IUPAC definition, when the signal-to-noise ratio equals 3, the signal is considered to be a true signal. Therefore, the detection limit can be extrapolated from the linear calibration curve when the signal equals three times of the noise.DL = 3rms/slopeUsing the above equation, the formaldehyde vapor detection limitis calculated to be 1.78ppm at room temperature.详细请参考我同学的文章Sensors and Actuators B 136 (2009) 80–85，查看更多
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