Phase meter based on zero-crossing counting of digitized signals

2020/09/02 by Wataru Kokuyama, Kokuyama, Wataru, Hideaki Nozato +3 · 1 citation
Engineering · Physics and Astronomy · #Advanced Electrical Measurement Techniques #Advanced Frequency and Time Standards #Advancements in PLL and VCO Technologies #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Optics (physics.optics)

paper · pdf · doi:10.48550/arxiv.2009.01137

openalex publication_date 2020/09/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We developed a compact and easy-to-use phase meter based on a zero-crossing counting algorithm for digitized signals. Owing to the algorithm, the phase meter has low-noise and wide dynamic range. Low-noise differential phase measurements can be done for square waves (-204 \mathrmdBrad²/Hz for a 1-kHz, 1-\mathrmV_p-p signal, 10 Hz-1 kHz offset, with cross-correlation) as well as sinusoidal waves, with a measurement error of <1 × 10^-4 rad. We also demonstrated a direct phase measurement of an optical-beat note from a free-running laser over 10 decades (0.25 mHz-10 MHz) with a wide dynamic range of ~280 dB at 0.25 mHz. The phase meter can be an alternative for conventional phase meters and frequency counters in wide range of experiments.

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