Photo-acoustic detector

Details Photo-acoustic detector Photo-acoustic detector

1988-03-09

1989-09-12

Kyle, Deborah L.

Communications, electrical: acoustic wave systems and devices

Signal transducers

250345, 350 9629, 356432, H04R 2300

Patent

active

048666815

ABSTRACT:
This 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 microphone disposed in said housing which is capable of sensing the pressure of the gas and producing an electric 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.

REFERENCES:
patent: 4055764 (1977-10-01), Dimeff
patent: 4193695 (1980-03-01), Kojima et al.
patent: 4236827 (1980-12-01), Horiba et al.
patent: 4253770 (1981-03-01), Horiba
patent: 4598201 (1986-07-01), Fertig et al.
patent: 4661320 (1987-04-01), Ito et al.
patent: 4740086 (1988-04-01), Oehler et al.

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