Holographic chemical vapor sensor |
| |
Authors: | Ye Hongke Nilsen Oyvind Bright Victor M Anderson Dana Z |
| |
Institution: | Department of Physics and JILA, National Institute for Standards and Technology, JILA UCB 440, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA. |
| |
Abstract: | A holographic interferometer senses vapor-induced optical path length changes in polymer or other chemically sensitive films. The interferometer is inherently sensitive to changes in chemical vapor content, self-compensates for drifts, and accommodates a large array of sensor elements. A sniff-locked-loop synchronous detection method takes advantage of the interferometer's rapid response to achieve vapor concentration sensitivity in the parts-per-billion (ppb, parts in 10(9)) range. We demonstrate, for example, 40 ppb sensitivity to ethyl alcohol using poly(N-vinyl pyrrolidone) with a measurement time of 5 s. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|