Development of an ultra-compact mid-infrared attenuated total reflectance spectrophotometer

Dong Soo Kim, Tae Ro Lee, Gilwon Yoon

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Mid-infrared spectroscopy has been an important tool widely used for qualitative analysis in various fields. However, portable or personal use is size and cost prohibitive for either Fourier transform infrared or attenuated total reflectance (ATR) spectrophotometers. In this study, we developed an ultra-compact ATR spectrophotometer whose frequency band was 5.5-11.0 μm. We used miniature components, such as a light source fabricated by semiconductor technology, a linear variable filter, and a pyro-electric array detector. There were no moving parts. Optimal design based on two light sources, a zippered configuration of the array detector and ATR optics could produce absorption spectra that might be used for qualitative analysis. A microprocessor synchronized the pulsed light sources and detector, and all the signals were processed digitally. The size was 13.5 × 8.5 × 3.5 cm3 and the weight was 300 grams. Due to its low cost, our spectrophotometer can replace many online monitoring devices. Another application could be for a u-healthcare system installed in the bathroom or attached to a smartphone for monitoring substances in body fluids.

Original languageEnglish
Article number074108
JournalOptical Engineering
Issue number7
Publication statusPublished - 2014 Jul


  • attenuated total reflection
  • body fluid
  • handheld spectrophotometer
  • infrared spectroscopy
  • ubiquitous healthcare

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Engineering


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