OPTICO-ACOUSTIC RECEIVER Russian patent published in 2001 - IPC

FIELD: optoelectron instrumentation, infrared radiation receivers of wide spectral range. SUBSTANCE: optico-acoustic receiver has chamber with inlet window, absorbing film and mirror membrane, optical microphone, diaphragm and key photodetector. Optical microphone includes radiation source, principal condenser, clear raster and objective lens mounted in sequence. Clear raster is installed in focal plane of objective lens. In contrast to traditional microphone this one is fitted with additional condenser, photodetector and beam splitting element placed in path of optical rays before principal condenser. In this case additional condenser is located between radiation source and beam splitting element and additional photodetector is positioned on axis perpendicular to normal to surface of mirror membrane and passing through center of beam splitting surface of beam splitting element. Beam splitting element can carry mirror coat deposited on beam splitting surface in which center clear zone is located. Radiation source and additional condenser are placed uniaxially with principal condenser, diaphragm with key photodetector and additional photodetector are positioned uniaxially on different sides of beam splitting element. Apart from it optical element can have mirror zone in center of its beam splitting surface. In this case radiation source with additional condenser and additional photodetector are installed uniaxially on opposite sides of beam splitting element and diaphragm and key photodetector are placed uniaxially with principal condenser. EFFECT: raised level of information signal and sensitivity of optical microphone. 2 cl, 6 dwg