Miniaturized all-fiber photoacoustic spectrometer for intravascular gas detection. (IMAGE)
Caption
The miniaturized all-fiber photoacoustic spectrometer (FPAS) consists of a single optical fiber, a silica capillary, and an elastic membrane. The fiber's end facet and the membrane form a Fabry-Perot cavity. When gas molecules absorb pump light, they generate acoustic waves, which cause the membrane to vibrate. This vibration changes the intensity of reflected probe light, which is then analyzed to detect trace gas concentrations.
Credit
J. Ma et al., doi 10.1117/1.AP.6.6.066008.
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For media use.
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Original content