Abstract

The design, construction, and performance of a compact double-beam far infrared spectrophotometer are described. An optical null system which minimizes the loss of energy is used as the photometric system. Efficient filter combinations not involving a crystal chopper are used for eliminating unwanted radiation. All optical components are mounted in a vacuum tank to eliminate the energy loss due to water vapor absorption. Accordingly, high resolution can be obtained through the entire spectral region from 500 cm⁻¹ to 60 cm⁻¹. In the instrument, provision for fully automatic performance is made through the control system which includes a variety of mechanisms. Ease of change from double-beam to single-beam operation is an additional feature.

© 1964 Optical Society of America

Improved Double Beam, Vacuum Far Infrared Spectrophotometer

Isao Iwahashi, Koichi Matsumoto, Shunji Matsudaira, Shigeo Minami, and Hiroshi Yoshinaga
Appl. Opt. 8(3) 583-588 (1969)

An Optical Null Double-Beam Double-Pass Infrared Spectrophotometer

Shigeo Minami
Appl. Opt. 2(12) 1309-1315 (1963)

A Method for Eliminating Error due to Sample Radiation in Double-Beam Far Infrared Spectrophotometer

Shigeo Minami, Hiroshi Yoshinaga, and Kunihide Matsunaga
Appl. Opt. 4(9) 1137-1140 (1965)

Improved Optical Null Infrared Spectrophotometer

L. W. Herscher, H. D. Ruhl, and N. Wright
J. Opt. Soc. Am. 48(1) 36-42 (1958)

Conversion of a Double-Beam Infrared Spectrometer to Grating Operation

M. V. Evans and L. C. Afremow
Appl. Opt. 3(3) 357-360 (1964)