Slit Width Effect on Signal-to-noise Ratio in Spectrophotometric Measurements | ||
| Egyptian Journal of Chemistry | ||
| Article 16, Volume 63, Issue 1, January 2020, Pages 197-201 PDF (1.39 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejchem.2019.14559.1884 | ||
| Authors | ||
| Alaaeldin Abdelmageed1; Essam Elmoghazy2; fatma El-Sharkawy* 1 | ||
| 1Photometry and Radiometry Division, National Institute of Standards (NIS), Egypt | ||
| 2Photometry and Radiometry Division, National Institute of Standards (NIS), Egypt. | ||
| Abstract | ||
| Signal-to-noise (S/N) ratio theory has proven to be useful in understanding, designing, and optimizing spectrophotometric measurement systems. Although a narrower spectral bandwidth does improve the resolution of closely spaced peaks, it also decreases the Signal-to-noise ratio. The narrowest slit width should be used that will yield an acceptable Signal-to-noise ratio. In this research, the wavelengths of peak absorbance of the holmium glass filter were determined to attain the optimum Signal-to-noise ratio accompanied with spectral bandwidths of 0.1 nm, 0.2 nm, 0.5 nm, 0.8 nm, 1 nm, 2 nm, 3 nm and 5 nm. The influence of spectral bandwidth on the Signal-to-noise ratio was by far the most important parameter affecting the location of the measured wavelengths of absorbance or transmittance of the sample. | ||
| Keywords | ||
| Spectrophotometer; slit width; signal-to-noise ratio; absorbance of the sample | ||
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