A new photothermal technique for sensing the tension in a small mechanical beam is described. The irradiation of chopped laser light on the beam produces a flexural resonance vibration whose amplitude is of the order of a nanometer. An axial tensile force changes the resonance frequency of the vibration slightly. By optically monitoring the frequency change, the tensile force acting on the beam is detected from a distance. Preliminary results suggest that the proposed technique will be useful for sensing tension in inaccessible environments and for development of new optical sensors associated with force and pressure.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics