Development and performance of a new high-resolution spectrophotometer using InGaAsP and InGaAs light emitting diodes in the near IR

Abstract In this paper, we report on a microcomputer-controlled spectrophotometer system employing a series of compact and high-radiant InGaAsP and InGaAs light emitting diodes (LEDs) which was newly designed and developed for high-resolution absorption measurement in laboratory and field uses in the NIR region of approximately 1.0–1.7μm. Some details of the design as well as operational procedure and performance for the automatic measurement were also described. Furthermore, using this NIR spectrophotometer system, the absorption spectra of C2H4 molecules in 1.6–1.7μm range were measured and analyzed. Some complex structure bands observed in 1.64–1.71μm were attributed to the overlapping of four combination bands. For absorption spectra identified to the binary combination band of v5 + v9 around 1.62 μm, with a nearly equal spacing between neighboring branches, the first assignment was provided, to our knowledge, and some of the vibrational and rotational constants for this combination band were also derived.

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