Home // International Journal On Advances in Telecommunications, volume 15, numbers 3 and 4, 2022 // View article
Authors:
Narito Kurata
Keywords: Time Synchronization; Chip Scale Atomic Clock; Earthquake Observation; Structural Health Monitoring; Micro Electro Mechanical Systems; Camera Sensor
Abstract:
The author is conducting research and development of different types of sensor systems for the maintenance of civil infrastructures, such as aging bridges and highways, and buildings. Highly accurate time information is added to measurement data, and a set of sensing data that ensures time synchronization is acquired and used for multimodal analysis of risk. In research so far, as a first step, a sensor device was developed that uses a digital high-precision accelerometer to perform highly-accurate time-synchronized sensing of civil infrastructures and buildings. A vibration table test was performed on the sensor device, and its time synchronization performance was verified. In this paper, a different type of digital sensing platform has been developed that allows a camera sensor to be connected in addition to a digital accelerometer. By adding a unified time stamp synchronized with the absolute time to data from the digital accelerometer and the image from the camera sensor when data is acquired, the vibration and the image can be measured synchronously. First, a Chip-Scale Atomic Clock (CSAC), which is an ultra-high-precision clock, is mounted on the sensor device, and a mechanism is implemented whereby a time stamp is added to the outputs of the digital accelerometer and the camera sensor with timekeeping precision. A Field-Programmable Gate Array (FPGA) dedicated to adding time stamps is prepared. Tests were performed on the developed sensor device using a shaking table, and the time synchronization performance was checked by comparing the measurement results of multiple sensor devices and a servo type acceleration sensor. Next, the results of a performance verification experiment on a camera sensor mounted on the platform, are described.
Pages: 42 to 51
Copyright: Copyright (c) to authors, 2022. Used with permission.
Publication date: December 31, 2022
Published in: journal
ISSN: 1942-2601