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Schematic of the FBG photonic pressure sensor (black) embedded in PDMS. The metal sleeve is about 2.5 cm long. Half the laser power is directed at a wavelength meter for feedback and the other half is transmitted to a circulator and FBG sensor. A detector on the output of the circulator measures the light reflected from the FBG sensor. The wavelength meter is used to stabilize the laser wavelength with typical precision of 1 MHz.
