Lead-free piezoelectric KNN-based pin transducers for structural monitoring applications

Kwok Ho Lam, D. M. Lin, Yiqing Ni, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


A 2.4mm diameter piezoelectric ceramic disc was used to construct a spring-loaded pin-type transducer for intelligent monitoring of systems. Two types of lead-free KNN-based ceramics (0.95K0.5Na0.5(Nb0.94Sb0.06)O3- 0.05LiTaO3+ 1.25 mol% BaO and K0.5Na0.5NbO3-0.75 mol% K5.4Cu1.3Ta10O29) were selected as a sensing element of the pin. The piezoelectric spring-loaded pins were mounted on the corners of the aluminum plate for the performance evaluation using a laser ultrasonic technique. The signals detected by transducers with different sensing elements including lead-based ceramics have been compared. The capability of impact detection of the lead-free transducers was shown to be comparable to that of the lead-based one. It is envisaged that lead-free piezoelectrics will become the important transducer materials in the next generation nondestructive evaluation technology.
Original languageEnglish
Pages (from-to)283-289
Number of pages7
JournalStructural Health Monitoring
Issue number4
Publication statusPublished - 1 Jul 2009


  • Lead-free ceramics
  • Pin transducer
  • Structural monitoring

ASJC Scopus subject areas

  • Biophysics
  • Mechanical Engineering


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