• Chinese Journal of Lasers
  • Vol. 48, Issue 24, 2404003 (2021)
Fei Dai, Kai Wang*, Wei Lin, Jun Li, and Haile Lei
Author Affiliations
  • Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan 621000, China
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    DOI: 10.3788/CJL202148.2404003 Cite this Article Set citation alerts
    Fei Dai, Kai Wang, Wei Lin, Jun Li, Haile Lei. Vibration Measurement of Cryostat Based on Principle of Fraunhofer Double-Slit Interference[J]. Chinese Journal of Lasers, 2021, 48(24): 2404003 Copy Citation Text show less
    Schematic of principle of vibration measurement. (a) Schematic of principle of improved Michelson interferometry; (b) schematic of Fraunhoffer double-slit diffraction
    Fig. 1. Schematic of principle of vibration measurement. (a) Schematic of principle of improved Michelson interferometry; (b) schematic of Fraunhoffer double-slit diffraction
    Relative light intensity of fringe at different phase difference. (a) Phase difference is 0; (b) phase difference is π/2; (c) phase difference is π; (d) phase difference is 3π/2
    Fig. 2. Relative light intensity of fringe at different phase difference. (a) Phase difference is 0; (b) phase difference is π/2; (c) phase difference is π; (d) phase difference is 3π/2
    Schematic of change in position of brightest stripe. (a) (c) (e) Brightest stripes move from left to right; (b) (d) (f) brightest stripes move from right to left
    Fig. 3. Schematic of change in position of brightest stripe. (a) (c) (e) Brightest stripes move from left to right; (b) (d) (f) brightest stripes move from right to left
    Relationship between relative light intensity distribution of interference fringe and width of slit on focal plane. (a) Slit width is 0.05 mm; (b) slit width is 0.10 mm; (c) slit width is 0.15 mm; (d) slit width is 0.20 mm
    Fig. 4. Relationship between relative light intensity distribution of interference fringe and width of slit on focal plane. (a) Slit width is 0.05 mm; (b) slit width is 0.10 mm; (c) slit width is 0.15 mm; (d) slit width is 0.20 mm
    Light intensity distribution of interference fringe of focusing lens at different focal lengths
    Fig. 5. Light intensity distribution of interference fringe of focusing lens at different focal lengths
    Influence curves of CCD image acquisition speed on measurement accuracy
    Fig. 6. Influence curves of CCD image acquisition speed on measurement accuracy
    Schematic of extraction method of brightest stripe position
    Fig. 7. Schematic of extraction method of brightest stripe position
    Reduction results of signal restoration at 500 nm amplitude. (a) PZT input signal; (b) Fourier transform of input signal; (c) time-vibration amplitude measurement result; (d) Fourier transform result of vibration signal
    Fig. 8. Reduction results of signal restoration at 500 nm amplitude. (a) PZT input signal; (b) Fourier transform of input signal; (c) time-vibration amplitude measurement result; (d) Fourier transform result of vibration signal
    Vibration measurement results of sample holder. (a) Time-vibration curve; (b) Fourier transform result of vibration signal
    Fig. 9. Vibration measurement results of sample holder. (a) Time-vibration curve; (b) Fourier transform result of vibration signal
    Measured voltage /mVVibration amplitude of PZT /nmMeasured amplitude /nmError /nm
    5.13051.352.61.3
    10.005100.1105.75.6
    19.990199.9198.81.1
    50.320503.2498.94.3
    79.470794.7795.50.8
    100.1901001.9997.33.5
    Table 1. Reduction results of vibration signals with vibration amplitude between 50 and 1000 nm
    Fei Dai, Kai Wang, Wei Lin, Jun Li, Haile Lei. Vibration Measurement of Cryostat Based on Principle of Fraunhofer Double-Slit Interference[J]. Chinese Journal of Lasers, 2021, 48(24): 2404003
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