Calibration of small grating spectrometers from 166 to 600 cm-1

Some Accurately Measured Infrared Wavelengths for Calibration of Grating Spectrometers

The measured values of the wavelengths of 60 lines in the 1.1to 2.3-micron spectral region are reported. The absorption lines of the bands of methane and water vapor were used in the calibration. The methods of measurement are discussed. Also discussed are the methods of superimposing the well-known emission lines of several sources on the absorption lines that were measured. The values obtaine...

Transmission grating based spectrometers

Calibration transfer from dispersive instruments to handheld spectrometers.

The Foss NIRSystem 6500 is one of the most commonly used laboratory instruments in agriculture and in particular in feed. New technological developments include micro-electro mechanical system (MEMS) technology, used in miniature handheld instruments such as the Polychromix Phazir spectrometer that are increasingly required for on-site analysis. The objective of this study was to assess the pot...

Fundamental limits to slow-light arrayed-waveguide-grating spectrometers.

We present an analytical model that describes the limiting spectral performance of arrayed-waveguide-grating (AWG) spectrometers that incorporate slow-light methods. We show that the loss-limited spectral resolution of a slow-light grating-based spectrometer scales as the loss-group-index ratio of the waveguide array. We further show that one can achieve a spectral resolution of a few GHz using...

Calibration and monitoring of spectrometers and spectrophotometers.

We have delineated some of the factors affecting the performance of spectrometers and spectrophotometers in the clinical laboratory and have presented some of the methods for verifying that these instruments are functioning properly. At a minimum, every laboratory should perform periodic inspections of spectrometric functions to check wavelength calibration, linearity of detector response, and ...