UV-VISIBLE- IR FOURIER TRANSFORM SPECTROSCOPY ON METAL HALIDE LAMPS

摘要

The 1 m Fourier transform spectrometer (FTS) at the National Solar Observatory on Kitt Peak, AZ has been used to record spectra of Metal Halide High Intensity Discharge (MH-HID) lamps covering the near UV, visible, and near IR. This unusually powerful instrument provides very broad UV to IR wavelength coverage, extraordinary (part in 10~8) wavenumber accuracy, a very small (0.01 cm~(-1)) spectral limit of resolution, and a massive data collection rate. It also has an intrinsic advantage for spectroradiometric measurements over large wavelength ranges due to the fact that an interferogram is a simultaneous measurement of an entire spectrum. Because all intrinsic spectral features are fully resolved, these spectra will provide: (1) fundamental spectral data for modeling radiation transport in MH-HID lamps, (2) a valuable new diagnostic approach, and (3) important insight on the relative role of atomic/ionic versus molecular radiation from MH-HID lamps. This paper is focused on the determination of line broadening coefficients for additives in MH-HID lines.