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The National Institute of Standards and Technology (NIST), Physical Measurements Laboratory (PML), Mass and Force Group, performs acoustical measurements and calibrations, and has a requirement for a ... The National Institute of Standards and Technology (NIST), Physical Measurements Laboratory (PML), Mass and Force Group, performs acoustical measurements and calibrations, and has a requirement for a Diaphragmless monolithic optical microphone. This microphone system must detect sound based on refractive index variation in a sound wave, at acoustic frequencies from 20 Hz – 100 kHz. Please see the attached sources sought notice AMD-SS23-15 for the complete details.