FIELD: control equipment.
SUBSTANCE: liquid level fiber-optic signaling device can be used for signaling on availability or absence of liquid inside area of measurement, which liquid is transparent for IR-radiation. Device has radiation source and receiver, feeding and removing optical fibers and sensitive element. The latter is made in form of rod having round cross-section; the element is made of optical transparent material, for which the following requirement is met: n0<nair.av<n1, where n0, nair.av and n1 are refractivity factor of liquid, air and rod correspondingly. Length L of rod is described by formula. R is radius of spherical segment of light-guide turned in the direction of media to be measured: 1,5dfe<=R<=2dfe, where dfe is diameter of envelope of optical fiber. R/L relation should meet specific conditions.
EFFECT: higher manufacturability of sensitive element's structure.
2 dwg
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