FIELD: measuring tech.
SUBSTANCE: invention relates to measuring technology and is intended to determine with a high degree of accuracy the level of liquid media with different refractive indices, incl. in non-stationary objects. A sensor for monitoring the level and type of liquid is proposed, which contains sequentially installed and optically matched radiation source, a transmitting optical fiber, a sensitive element, receiving optical fibers and photodetectors, a coaxial with the supplying and off-axis ones, connected to the signal processing unit. The distance to the off-axis optical fibers from the axial one is a function of the operating wavelength of the radiation, the gap between the receiving and transmitting optical fibers and the aperture angles of the optical fibers for the measured media. At the free end of the transmitting light guide of the sensing element, a Porro prism is formed with an edge at the apex of a larger angle passing through the center of the light guide core and perpendicular to the plane in which the optical axes of the light guides are located. Execution option: off-axis receiving optical fibers are located at an angle to the optical axis of the transmitting optical fiber, not exceeding the aperture angles of the optical fibers for the medium corresponding to their position.
EFFECT: creation of a noise-immune sensor for measuring the liquid level.
2 cl, 3 dwg
