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- W765253500 abstract "The laser Doppler interferometer reported here wasdeveloped to investigate the possibilities of remotevibration and motion measurements. The method is noncontacting and operates with unprepared targets, using the diffusely scattered light to measure the axial component of the motion. A full description of the motion requires both magnitude and direction of the target motion. The magnitude was found by standard heterodyning techniques, mixing light scattered from the target with a part of the original laser output in a controlled manner. A phase quadrature method was used to identify the direction of the target. This differs from the more usual method of frequency offsetting in requiring only passive optical components and therefore being considerably cheaper. This feature is believed to be novel to the LDI reported here.Measurements were recorded for target motions over therange 100 mm. to (c. ) 1 um. Because unprepared andtherefore optically rough targets were used the lightreceived by the detectors was not well behaved. Thisresulted in instability of the sense of motion signal dueto loss of either of the detector signals for displacementsabove 500 um. However this should not be considered anupper limit to the range of the LDI, as serious loss of thesense signal was rare up to (c. ) 25 mm. and measurementswere made up to a peak displacement of 200 mm. Correlations with an accelerometer and an LVDT show that the LDI can reliably measure displacement up to a range of 25 mm. with a maximum target velocity of 32 mm/s limited currently be the signal processing. Theoretical resolution with this device is better than 0.08 um. if full use is made of both detected signals." @default.
- W765253500 created "2016-06-24" @default.
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- W765253500 date "1986-08-01" @default.
- W765253500 modified "2023-09-27" @default.
- W765253500 title "The application of laser doppler technique to vibration measurement and position control." @default.
- W765253500 hasPublicationYear "1986" @default.
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