Home // SENSORDEVICES 2023, The Fourteenth International Conference on Sensor Device Technologies and Applications // View article
Authors:
Narito Kurata
Keywords: Time Synchronization; Chip Scale Atomic Clock; Earthquake Observation; Structural Health Monitoring; Micro Electro Mechanical Systems; Camera Sensor
Abstract:
In Japan, the maintenance and management of aging bridges, highways, and other civil infrastructure and buildings is an important social issue. Proper maintenance and management require regular and highly accurate inspections, but these inspections rely on visual examinations by humans, which are expensive. Hence, to make this process more efficient, there is a need to automate inspections using sensing systems. Moreover, after a disaster, such as a major earthquake or a tsunami, it is necessary to expedite evacuation operations and rescue people, and for this purpose, the viability of or damage to each structure must be accurately evaluated using a sensing system. To meet these challenges, research and development is being carried out on an autonomous time-synchronized sensing system. The system adds high-precision time information to measurement data, acquires and analyzes digital sensor data that are time-synchronized, and uses it to automate inspections. As a first step in this research, a sensor device was developed that performs autonomous time-synchronized sensing using a digital high-precision accelerometer. As a second step, a heterogeneous digital sensing platform was developed that can be connected to a camera sensor in addition to a digital accelerometer. The data from the digital accelerometer and images from the camera sensor are given a unified time stamp synchronized with the absolute time at the moment of data acquisition, thereby enabling synchronized measurement of vibration and images. A mechanism was implemented to add time stamps to the outputs of the digital accelerometer and camera sensor using the timekeeping accuracy of a chip-scale atomic clock (CSAC) mounted on the sensor device. As a prototype, the heterogeneous digital sensing platform achieved the desired performance. In this paper, an autonomous time-synchronized sensing system, which was newly designed and built to be applied to actual bridges, highways and buildings to stably acquire data from a digital accelerometer with accurate time information, image data from a camera sensor and data from any type of analog sensor, based on knowledge obtained in previous development, is reported.
Pages: 30 to 37
Copyright: Copyright (c) IARIA, 2023
Publication date: September 25, 2023
Published in: conference
ISSN: 2308-3514
ISBN: 978-1-68558-091-9
Location: Porto, Portugal
Dates: from September 25, 2023 to September 29, 2023