P10 - Cantilever Enhanced Photoacoustic Spectroscopy of Hair Microsamples
- Event
- AMA Conferences 2013
2013-05-14 - 2013-05-16
Nürnberg - Band
- Proceedings IRS² 2013
- Chapter
- IP - Poster Session
- Author(s)
- J. Lehtinen, T. Kuusela - University of Turku (Finland)
- Pages
- 130 - 134
- DOI
- 10.5162/irs2013/iP10
- ISBN
- 978-3-9813484-3-9
- Price
- free
Abstract
We have demonstrated that a highly detailed infrared spectrum of single human hair fiber with length less than 1 cm can be measured using cantilever based photoacoustic detection. The smallest measured hair sample was approximately 0.5 mm in length and 50 μm in diameter. Different sample sizes have been measured and the effect of sample size to the signal-to-noise ratio (SNR) has been investigated. In addition, depth and length profiling spectra have been collected. Depth profiling experiments showed a change in the lipids of the hair in the different layers. Length profile of a longer hair fiber showed a change in the S=O peak at 1042 cm-1. A practical sample size for measuring single hair fibers with this setup was determined to be 5 mm. The method showed an excellent reproducibility of the measurement in addition to the high sensitivity of the cantilever microphone.