64 channel fiber optic spectrometer for a dual wavelength interferometric pressure sensor array

摘要: As part of a fiber optic, interferometric pressure sensing array system for hypersonic wind tunnel studies, 64 channel spectrometer has been developed to separate the return signals by both position and wavelength. The is designed optically quadrature from interferometer. A ribbon single‐mode fibers carrying dual wavelengths (811.7 813.3 nm) surface forms entrance slit spectrometer. This uses unique optical layout consisting 32 element microlens array, narrow passband interference filter concave mirror focus onto photosensitive 1×64 photodiode array. collimates emerging beams minimize cross talk between channels. detector its control electronics are an integral mounted on same baseplate as other components. Fast scanning digitizing produce effective data rate 160 kHz Details construction results calibration presented.