Flexible polysilicon sensor array modules using "etch-release" packaging scheme

Eun Soo Hwang, Yong Jun Kim, Byeong Kwon Ju

Research output: Contribution to journalConference articlepeer-review

16 Citations (Scopus)


A flexible polysilicon strain gauge array has been designed and fabricated using surface-micromachining with a SiO2 sacrificial layer. The realized sensor array is mechanically flexible, which can be attached on a non-planar surface. To realize the flexible polysilicon strain gauge array, a new packaging scheme using polysilicon/oxide-based surface-micromachining was developed. The proposed packaging scheme completes the strain sensor and the circuit board on a single process, which eliminates additional assembly and alignment problems. The measured gauge factor shows that it is more sensitive than conventional metal strain gauges. Unlike a single-crystal silicon strain gauge, a crystal direction does not affect its sensitivity in a polysilicon sensor, and this isotropic property makes the realization of an omni-directional strain gauge array possible. The proposed flexible strain sensor array can be used in a measurement of stress distribution of an arbitrary and non-planar surface.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalSensors and Actuators, A: Physical
Issue number1
Publication statusPublished - 2004 Mar 1
EventMicromechanics Section of Sensors and Actuators, based on - Kyoto, Japan
Duration: 2003 Jan 192003 Jan 23

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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