Interference Fringes and Time Interval Measurement Method for Gravimeter Based on Dual Phase-Locked Loop IP Core in FPGA

ZHANG Bo

doi:10.12338/j.issn.2096-9015.2021.0666

Volume 66 Issue 12

Feb. 2023

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ZHANG Bo. Interference Fringes and Time Interval Measurement Method for Gravimeter Based on Dual Phase-Locked Loop IP Core in FPGA[J]. Metrology Science and Technology, 2022, 66(12): 61-66, 40. doi: 10.12338/j.issn.2096-9015.2021.0666

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ZHANG Bo. Interference Fringes and Time Interval Measurement Method for Gravimeter Based on Dual Phase-Locked Loop IP Core in FPGA[J]. Metrology Science and Technology, 2022, 66(12): 61-66, 40. doi: 10.12338/j.issn.2096-9015.2021.0666

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Interference Fringes and Time Interval Measurement Method for Gravimeter Based on Dual Phase-Locked Loop IP Core in FPGA

doi: 10.12338/j.issn.2096-9015.2021.0666

ZHANG Bo

Heilongjiang Institute of Metrological Verification and Testing, Harbin 150028, China

Received Date: 2021-12-07
Accepted Date: 2022-01-12
Rev Recd Date: 2022-01-09

Available Online: 2023-01-14

Publish Date: 2022-12-18

Abstract

Abstract

The principle and method of measuring falling time and distance of the falling body in the absolute gravimeter by FPGA are introduced, and the programmable system-on-chip based on Altera Cyclone IV series EP4CE6E22C8N chip and the implementation process of frequency doubling phase shift timing method are described. The measurement error of the falling body in the gravimeter during a falling process of about 200m is ± 0.6ns. The standard uncertainty of measurement is 0.308ns, and the resolution can reach 0.4ns, which improves the accuracy of the existing absolute gravimeter. Finally, the correctness and effectiveness of the design are verified by simulation software and experimental data.
- FPGA,
- frequency doubling phase shift,
- time interval measurement,
- gravimeter,
- interference fringe

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References(21)

References

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