S to N demo - SNR comparison 2000 1700 Raman Intensity...

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Unformatted text preview: SNR comparison 2000 1700 Raman Intensity (a.u.) 1400 1100 800 500 200 0 500 1000 1500 2000 2500 0.05 sec 1.25 sec 5 sec Shows different intensities of different integration times. 3000 3500 Raman shift (cm-1) Raman Intensity (a.u.) 225 220 215 210 205 200 195 3500 1000 800 600 400 200 0 500 1000 1500 2000 2500 3000 Raman Shift (cm-1) Raman Intensity (a.u.) Close up of two spectra. The 1.25 sec (pink spectrum) is 2000 shown with the scale 1800 used in the previous 1600 slide. The 0.05 sec 1400 spectrum is shown 1200 with a smaller scale. 1.25 sec 0.05 sec 240 235 230 Raman Intensity (a.u.) 1200 1000 800 600 400 200 0 500 1000 1500 2000 -1 2500 3000 Raman Shift (cm ) Raman Intensity (a.u.) Smaller divisions are shown on the right side of 2000 the 1800 graph to estimate the 1600 level of noise. 1400 0.05 sec 1.25 sec 5 sec 2200 2120 2040 1960 1880 1800 1720 1640 1560 1480 1400 1320 1240 1160 1080 1000 920 840 760 680 600 520 440 360 280 200 3500 To quantify the signal 2000 1800 Raman Intensity (a.u.) 1600 1400 1200 1000 800 600 400 200 1200 1.25 sec 5 sec 1300 1400 1500 1600 1700 1800 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 1900 Raman Shift (cm-1) Raman Intensity (a.u.) To compare a 1.25 second integration spectrum with the summation of 25 spectra acquired at 0.05 seconds each. 600 500 Raman Intensity (a.u.) 1.25 sec Summation 25,0.05 sec 600 500 400 300 200 100 0 2500 Raman Intensity (a.u.) 400 300 200 100 0 500 1000 1500 Raman shift (cm-1) 2000 ...
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S to N demo - SNR comparison 2000 1700 Raman Intensity...

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