Application of digital photometry techniques in identifying the modal frequencies of stay cables

Chien Chou Chen, Wen Hwa Wu, Hong-Zeng Tseng, Gwolong Lai, I. Der Shieh

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Benefiting from the rapid advances in related technologies, digital camcorders have not only been significantly improved in image resolution and sampling frequency, but also become much more popular because of friendly operation and reduced cost. Consequently, the technique of digital photometry has recently been attempted for its possible application in the measurement and identification of various physical quantities. This paper is aimed to develop the application of consumer grade digital camcorders in the ambient vibration measurements of structures. Furthermore, several problems and corresponding solutions in identifying the modal frequencies based on these measurements are also explored. The proposed digital photometry technique has been successfully applied in the on-site ambient vibration measurements for the stay cables of Chi-Lu Bridge and the subsequent identified results of modal frequencies clearly verify that it hold almost the same order of accuracy as that with high-resolution velocimeters.

Original languageEnglish
Pages (from-to)411-421
Number of pages11
JournalJournal of the Chinese Institute of Civil and Hydraulic Engineering
Issue number4
Publication statusPublished - 2010 Dec 1

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering


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