Effective normalization method for sample-position-dependence effect in photoacoustic spectrometry.
Sample position dependence effect in photoacoustic (PA) spectrometry has been reported by several scientists. This effect must be taken into account in a PA application that requires a quantitative theoretical treatment. In this work, we experimentally investigated PA signal magnitude varying with sample-to-window distance in an MTEC Model 300 Photoacoustic Detector, which has a fixed empty (gas) volume in addition to the sample-to-window-distance-dependent gas volume. An operative method was introduced to obtain the coefficient, which considered the sample-to-window distance and the additional gas volume. With this coefficient, the one-dimensional PA model, developed by Aamodt, Murphy, and Parker, can be employed to quantitatively process PA experimental data, no matter what the sample-to-window distance is. Quantitative measurements of thermal effusivities of two samples were performed to prove this effective normalization method.
Shen
Jun
J
Innovation Centre, National Research Council of Canada, 3250 East Mall, Vancouver, British Columbia, Canada V6T 1W5.
Zhou
Jianqin
J
Hu
Cheng
C
Zhao
Jianhua
J
D000162:Acoustics / Q000295:instrumentation; D000465:Algorithms; D016477:Artifacts; D002138:Calibration / Q000592:standards; D002244:Carbon / Q000737:chemistry*; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry; D007834:Lasers; D011786:Quality Control; D015203:Reproducibility of Results; D012408:Rubber / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods* / Q000592:standards; D013696:Temperature
D002244:Carbon; D006108:Graphite; D012408:Rubber