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The Performance of the Perkin-Elmer Model 21 in the Region 210mu to 2000mu

Volume 9, Number 1 (Feb. 1955) Page 14-19

Coates, Vincent; Miller, Thomas; Savitzky, Abraham


The Perkin-Elmer Model 21 Infrared Recording Spectrophotometer presently has the ability to provide accurate, high resolution absorption spectra in the infrared portion of the spectrum from 2 to 37μ. (1-3) This paper describes the conversion of this instrument for operation in the ultraviolet, visible and near infrared from 210 to 2000μ. This is a logical extension of the performance of this instrument. Its original design principles make it well suited in many respects for operation as a universal transmittance recording absorption spectrophotometer. It employs an all-reflecting f4.5 optical system and its null balance principle is not limited to any one region of the spectrum. The mechanical and electronic systems are stable and capable of handling the signals produced by photocell as well as thermal detectors.