In emission spectral measurement with a dispersive spectrometer, if the entrance slit is widely opened, more light from a relatively large sample area can be collected, thus both energy throughput and spatial averaging advantages can be achieved in the measurement. With the entrance slit widely opened, the spectral bandpass becomes large. Radiations of different wavelengths likely fall on the same area of the detector. This can lead to a multiplex advantage and also extend the accessible wavelength range for a given spectral window. / The problem for opening the entrance slit is the decrease of spectral resolution. This project aimed to overcome this problem so that all the advantages associated with opening entrance slit are retained without loss of spectral resolution. The research we have done to solve this problem is to apply Hadamard transform and deconvolution in spectral measurements. The way we implement Hadamard transform in emission spectroscopy is to take spectra with a Hadamard mask in place of the conventional entrance slit, then inversely transform the measured data to recover the well-resolved spectra with improved signal-to-noise ratio. A spectrum can also be taken simply with the entrance slit widely opened. By deconvolving the slit function with such a wide-slit spectrum a best resolved spectrum can be recovered. Major difficulties involving in deconvolution have been discussed in Chapter 5 of this dissertation, and a novel algorithm is proposed there as well. Another important aspect involved in this project is the incorporation of fiber optics with Hadamard transform and deconvolution in spectral measurements. This greatly improved the flexibility and collection efficiency in our measurement system. / Source: Dissertation Abstracts International, Volume: 52-10, Section: B, page: 5236. / Major Professor: Charles K. Mann. / Thesis (Ph.D.)--The Florida State University, 1991.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_76532 |
| Contributors | Zhu, Jianxiong., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 124 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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