41 citations · 142 across the 14 of their papers we have counts for
6 papers · 1 filter
Accurate laboratory testing of low-frequency triaxial vibration sensors under various environmental conditions
Tomofumi Shimoda, Wataru Kokuyama, Hideaki Nozato
Triaxial vibration sensor are widely used used in various application. Recently, low-cost sensors based on micro electro mechanical system (MEMS) technology are also becoming more…
Optical sound pressure measurement using Fabry-Pérot cavity for primary acoustic standards
Koto Hirano, Wataru Kokuyama, Hajime Inaba +5
Optical sound pressure measurement is a promising technology to establish primary acoustic standards without reliance on specific types of microphones. We developed a precision opt…
Measurement of the intrinsic sensitivity for a single-ended accelerometer without the influence of the mounting condition
Tomofumi Shimoda, Wataru Kokuyama, Hideaki Nozato
The calibration technique for accelerometers has been internationally developed for up to 20 kHz to ensure the reliability of vibration measurement. However, it has been establishe…
Primary accelerometer calibration with two-axis automatic positioning stage
Wataru Kokuyama, Tomofumi Shimoda, Hideaki Nozato
In this study, we developed an automated, multipoint primary accelerometer calibration system using a two-axis positioning stage and a heterodyne laser interferometer. The proposed…
Phase meter based on zero-crossing counting of digitized signals
Wataru Kokuyama, Hideaki Nozato, Thomas R. Schibli
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…
Simple digital phase-measuring algorithm for low-noise heterodyne interferometry
Wataru Kokuyama, Hideaki Nozato, Akihiro Ohta +1
We present a digital algorithm for measuring the phase difference between two sinusoidal signals that combines the modified fringe-counting method with two-sample zero crossing to…