Low-latency data acquisition hardware for real-time wireless sensor applications

Lauren E. Linderman, Hongki Jo, Billie F. Spencer

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Wireless sensor networks (WSNs) are an attractive alternative to traditional tethered systems for monitoring and feedback control of civil structures. In civil engineering, research has focused on the application of WSN to structural health monitoring (SHM); as a result, hardware has been tailored to SHM applications. However, the real-time performance requirements of WSNs for control are more stringent than for monitoring applications. Wireless communication, processing time, and data-acquisition hardware are a few of the many sources of time-delay in wireless control systems; this paper will focus on the latency due to the acquisition and actuation hardware in the control loop, i.e., the time between capturing a measurement and its availability on the processor. Previous work on smart sensor hardware focuses either on resolution for SHM applications or the actuation interface for control applications. Overall, an analysis of latency due to the data-acquisition hardware and an understanding of the inherent limitations have been lacking. This paper illustrates the limitations of a common analog-to-digital converter (ADC) architecture for SHM applications and presents a low-latency hardware solution for wireless control nodes. The performance of the two different data-acquisition techniques emphasizes the implication of ADC architecture on the latency and resolution of the data. Ultimately, through the use of an successive-approximation-register-type ADC and careful design of the corresponding driver, the latency due to the hardware is almost negligible.

Original languageEnglish (US)
Article number6952924
Pages (from-to)1800-1809
Number of pages10
JournalIEEE Sensors Journal
Volume15
Issue number3
DOIs
StatePublished - Mar 1 2015

Fingerprint

data acquisition
Data acquisition
hardware
Hardware
structural health monitoring
Structural health monitoring
sensors
Sensors
analog to digital converters
Digital to analog conversion
Wireless sensor networks
actuation
Smart sensors
Engineering research
Monitoring
registers
wireless communication
Civil engineering
feedback control
Feedback control

Keywords

  • Analog-digital conversion
  • Control systems
  • Sensor systems and applications
  • Wireless sensor networks

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Instrumentation

Cite this

Low-latency data acquisition hardware for real-time wireless sensor applications. / Linderman, Lauren E.; Jo, Hongki; Spencer, Billie F.

In: IEEE Sensors Journal, Vol. 15, No. 3, 6952924, 01.03.2015, p. 1800-1809.

Research output: Contribution to journalArticle

Linderman, Lauren E. ; Jo, Hongki ; Spencer, Billie F. / Low-latency data acquisition hardware for real-time wireless sensor applications. In: IEEE Sensors Journal. 2015 ; Vol. 15, No. 3. pp. 1800-1809.
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