Patent ID: 8342005

Claim:
A method for detecting a vibration of a flexible member (FM), wherein said FM is operatively fixed relative to an area such that a pressure change in said area will deflect said FM, wherein said area comprises a material of interest (MOI) access port, the method comprising: directing a first pulse of light (FPOL) into said area during a first period of time (FPOT), wherein said. FPOL comprises a wavelength λ 1 that is selected so that it will be absorbed by said MOI, if said MOI is located within said area, and produce first component of increased pressure within said area, wherein said FPOL produced component will produce a first deflection component of said FM, wherein if said FPOL heats a boundary of said area and produces a second component of increased pressure, said second component will produce a second deflection component of said FM; preventing said FPOL from entering said area for a second period of time (SPOT); directing a second pulse of light (SPOL) onto said boundary during said SPOT, wherein said SPOL comprises a wavelength λ 2 that is selected so that it will heat said boundary to produce a third component of increased pressure within said area that is about equal to said second component of increased pressure, wherein during said SPOT, substantially only said MOI will cool, wherein said first deflection component will at least partially resolve by vibration of said FM; and detecting said vibration.