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- W2095808512 abstract "The effects of ambient temperature and relative humidity on the positions of spectral lines on a two-dimensional focal plane were investigated. When environmental conditions change, a spectral line can move in both the horizontal (x) and vertical (y) directions. To characterize these changes, a position-shift vector for each spectral line was defined, and its magnitude in the horizontal Δλx and vertical Δλy directions determined as temperature (T) and relative humidity were systematically varied over a range of 24–34 °C and 31–51%, respectively. Spectral lines were examined that spanned a range from 250–570 nm. Overall, Δλx declines with increasing ambient temperature, whereas Δλy becomes larger. A change in relative humidity does not influence Δλx, but raises Δλy in an almost linear fashion. Both Δλx and Δλy were found to change with wavelength non-linearly. Position-shift equations involving Δλx and λ show they are related to the grating constants and the incident angle α of the echelle, and these involving Δλx and T are governed by the wavelength of a spectral line, the grating constant, the focal length of the spectrometer, thermal expansion coefficients of the grating and spectrometer, the ambient temperature and the diffraction angle of the echelle." @default.
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- W2095808512 date "2003-01-01" @default.
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- W2095808512 title "Investigation of wavelength calibration for an echelle cross-dispersion spectrometer" @default.
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- W2095808512 doi "https://doi.org/10.1039/b300981p" @default.
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