Developing of Scanning Photoacoustic Microscope

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We developed the hardware and software of scanning photoacoustic microscope(SPAM) composed of low price parts. We found that our SPAM could be used well to understand fundamental characteristics of a surface flaw on machinable ceramic, surface and subsurface flaws in epoxy and the distribution of carbon fiber in the CFRP as an equipment of nondestructive testing.Amplitude and phase of a photoacoustic signal generated from an epoxy resin on various backings(aluminum, white acrylic resin and black-coated white acrylic resin) were measured by this SPAM.The experimental results were as follows.The photoacoustic signals for light-reflective backings were generated from the epoxy resin on the backing, while photoacoustic signals for light-absorptive backing were generated from the backing itself. We proposed a "model for PA imaging of" a drilled hole in the epoxy resin sample.