Accurate and Precise Wavelength Calibration for Wide Bandwidth Array Spectrometers

Abstract

Calibrating the wavelength scale of an array spectrometer typically involves measurements of lines at well-known wavelengths from a calibration lamp such as a mercury-argon source. This process is relatively straightforward when the lines are well separated, relative to the bandwidth of the spectrometer. When the spectrometer's bandwidth is large, compared with the distance between calibration wavelengths, it becomes increasingly difficult to accurately locate lines in the calibration spectrum. Even calibrations for instruments with a modest bandwidth of 12 nm can be difficult. Here we present results from a simple approach to improve the accuracy of wavelength calibration for an instrument with a large bandwidth (12 nm, center-to-center pixel spacing 3.3 nm). A monochromator has been used to filter the source so that each calibration line can be measured separately. For ten spectrometers, we were able to achieve accuracy better than 0.12 nm, or 0.09 nm on average; this is less than 3% of the pixel spacing. We anticipate this approach will be useful for improving the accuracy of measurements on array spectrometers and particularly in transferring multivariate calibrations between instruments.

Optical Detection of Green Emission for Non-Uniformity Film in Flat Panel Displays

“…This calibrated apparatus adopts the Model 6034 pencil lamp from Oriel Instruments. The criterion for the Figure 14 presents the architecture of the calibrated spectrometer linking 198 Hg discharged lamp which utilizes spectral lines to calibrate the spectrometer in the visual spectrum [20][21][22]. This calibrated apparatus adopts the Model 6034 pencil lamp from Oriel Instruments.…”

Optical Detection of Green Emission for Non-Uniformity Film in Flat Panel Display

“…CIExyY colour distribution of A1, A2, B1 and B2 Figure 14 present the architecture of the calibrated spectrometer linking 198 Hg discharged lamp, which utilizes the measurement of spectral line to calibrate the spectrometer of spectral line in the visual spectrum [18][19][20]. This calibrated apparatus adopts the Oriel Instruments, model 6034 pencil lamp.…”

Uncertainty evaluation and propagation for spectral measurements

“…Manufacturers often employ a third order polynomial for the wavelength calibration of their spectroradiometers. 40 Once the polynomial coefficients in Equation 11 have been determined, the wavelength correction D k is determined through…”