Abstract
The present invention pertains to a photo-acoustic apparatus for detecting energy that exits from the end of an optical fiber waveguide device. The photo-acoustic apparatus includes a housing having an opening through which the end of the optical waveguide device extends into the housing. The gas fills the housing and is capable of absorbing energy that exits the end of the optical waveguide device. The gas increases in pressure corresponding to the energy absorbed by it. There is also a pressure sensor such as a capacitor micorphone disposed in said housing which is capable of sensing the pressure of the gas and producing an electrical signal proportional to the energy which exits the optical waveguide device. Alternatively, a solid absorber is disposed in the housing that absorbs energy that exits from the end of the optical waveguide device. The gas filling the housing, in this case, does not absorb any of the energy.
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