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A highly miniaturized NDIR methane sensor

N. P. Ayerden ; G. De Graaf ; Peter Enoksson (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system ) ; R. F. Wolffenbuttel
Micro-Optics 2016, Brussels, 4-5 Apr.; (SPIE Proceedings vol. 9888) (0277-786X). Vol. 9888 (2016), p. art. no. UNSP 98880D.
[Konferensbidrag, refereegranskat]

The increasing demand for handheld systems for absorption spectroscopy has triggered the development of microspectrometers at various wavelength ranges. Several MEMS implementations of the light source, interferometer/optical filter, and detector have already been reported in the literature. However, the size of microspectrometers is still limited by the required absorption path length in the sample gas cell. This paper presents a compact MEMS linear-variable optical filter (LVOF) where the resonator cavity of the filter is also used as a sample gas cell to measure the absorption of methane at 3392nm wavelength. The physical resonator cavity length is elongated 62.2-fold, using multiple reflections from highly reflective Bragg mirrors to achieve a sufficiently long effective optical absorption path. Although the LVOF would in principle enable operation as a robust portable microspectrometer, here it is used in a miniaturized NDIR methane sensor for wavelength selection and calibration.

Nyckelord: Optical sensor, spectroscopy, mid-IR, Bragg mirror, Fizeau, methane, gas sensor, fabry-perot, spectral range, microspectrometer, mems, interferometer, spectrometer, cavity, filter

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Denna post skapades 2017-01-16. Senast ändrad 2017-07-07.
CPL Pubid: 247120


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