Leti has developed prototypes of centimetre-size portable optical sensors for chemical detection of gas. The photo-acoustic sensors are based on mid-infrared photonic integrated circuits (MIR PICs). These silicon PICs, created by integrating optical circuits onto millimeter-size silicon chips, make extremely robust miniature systems, in which discrete components are replaced by on-chip equivalents. This makes them easier to ...
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from Electronics Weekly https://www.electronicsweekly.com/news/business/leti-develops-tiny-pic-sensors-detect-gas-2019-03/
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