Liquid density sensing by using a photothermal vibration

Seiki Inaba, Yoshiki Okuhara, Kazuhiro Hane

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


An optical sensing system for measuring liquid density, which uses the resonance frequency shift of a membrane vibrated by the photothermal effect in liquid, is described. On increasing the liquid density from 0.79 to 1.18 g/cm3, the resonance frequency for the membrane with a cantilever structure decreased monotonically from 1940 to 1700 Hz by sound radiation from the vibrating membrane.

Original languageEnglish
Pages (from-to)163-166
Number of pages4
JournalSensors and Actuators A: Physical
Issue number3
Publication statusPublished - 1992 Jun


  • photothermal vibration


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