Infrared Beam Finder

The Harrick Infrared Beam Finder allows viewing of the infrared beam from an FT-IR spectrometer and simplifies alignment of accessories. It contains a tab with a phosphor-based compound that absorbs and "traps" light energy from a short wavelength source (such as a lamp or sunlight), and then releases this stored light in the form of visible light upon exposure to IR radiation. The result is a localized glow of intensity relative to the amount of stored light and to the intensity of the IR incident upon the active phosphor area.

Infrared Beam Finder
Beam finder for FTIR spectroscopy
Model No.
NOTE: A Model No. ending in "XXX" denotes spectrometer code.

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  • Glows a deep orange upon exposure to infrared radiation.
  • Phosphorescent area is approximately the size of the infrared beam.
  • Infrared beam finder.
Infrared Beam Finder

The Infrared Beam Finder is an easy way to locate the infrared beam. It incorporates a specialty paper which changes under ambient light and phosphoresces upon exposure to infrared radiation. Detailed specifications of the phosphor paper are given in Table 1, and its response as function of wavelength is shown in Figure 1.

Table 1: Phosphor Specifications

Figure 1. Phosphor Sensitivity as a Function of Wavelength