| 摘要 |
FIELD: laser technology; measuring technique. ^ SUBSTANCE: device and method can be used for fiber-optic measurement of spatial distribution of temperature/deformation of elongated objects, namely, it can be used in oil industry, power engineering, automotive industry for monitoring of deformations in structures of bridges, supports and buildings. System has radiation source - laser - optically connected with optical fiber (with diameter of 150-600 mcm and diameter of core of 12-20 mcm) composed of point detectors on base of Bragg fiber arrays, reflecting light at different resonant wavelengths; fiber beam-splitting unit; spectrum analyzer in for of photoreceiver. Detectors with different reflection factors and/or with different width and shape of spectrum reflection alternate in optical fiber to follow preset order, including selection into groups. Detectors are recorded in thick optical fiber by laser at wavelength of 240-270 nm and at power of 0,5 W and higher. They also van be recorded through protecting polymer envelope disposed onto light guide by means of laser radiation at wavelengths of 270-450 nm and at power of 1 W and higher. Uniformity and stability of recorded Bragg array is improved. ^ EFFECT: improved reliability; reduced cost; higher speed of operation; increased sensitivity of array to environment influence. ^ 4 cl, 2 dwg |
