|
|||||
|
|
Improvement and validity of shock measurements using heterodyne laser interferometer |
|
| Affiliation: | 1. University of Cassino and Southern Lazio, Department of Electrical and Information Engineering, Cassino, FR, Italy;2. University of Salerno, Department of Industrial Engineering, Fisciano, SA, Italy;3. University of Sannio, Department of Engineering, Benevento, BN, Italy;1. Aresys, Via Privata Flumendosa 16, 20132 Milano, Italy;2. ESA ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands;3. ESA ESRIN, Via Galileo Galilei, 00044 Frascati, Italy;1. CEIT and University of Navarra, Donostia – San Sebastián, Spain;2. CAF, Construcciones y Auxiliar de Ferrocarriles, Beasain, Guipuzcoa, Spain;1. Zhejiang Industry Polytechnic College, Shaoxing 312000, China;2. School of Aeronautics and Astronautics, Zhejiang University, 310027 Hangzhou, China |
| Abstract: | The improvement and validity of shock measurements using only the laser head (heterodyne laser interferometer) of a commercial laser Doppler vibrometer was investigated by comparing acceleration waveforms measured by a homodyne laser interferometer with those measured by a heterodyne laser interferometer. The acceleration waveforms were generated from the displacement waveforms obtained with a reference quadrature homodyne laser interferometer by applying a numeric differentiation process twice. The differences between the two acceleration waveforms were found to be small with the measurement uncertainty in case of high acceleration level. In a further investigation, the accuracy of the shock measurements taken by the homodyne and heterodyne laser interferometers were compared in computational simulation. The results indicated that the accuracy of the heterodyne laser interferometer was superior to that of the homodyne laser interferometer. |
| Keywords: | Shock Acceleration measurement Homodyne laser interferometer Laser Doppler vibrometer Heterodyne laser interferometer |
| 本文献已被 ScienceDirect 等数据库收录！ | |