NASA NTRS · 19830000651
Optical Turbopump Speed Sensor
Abstract
Optical tachometer measures shaft rotation from outside turbopump housing. Laser-diode beam passes through quartz lens into shaft nut with alternating reflective and nonreflective surfaces. Reflected pulses collected by lens and transmitted to photodetector.
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Swain, D.. 1984-11-01. Optical Turbopump Speed Sensor. https://ntrs.nasa.gov/citations/19830000651
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