ABSTRACT:

An optoelectronic remote monitoring method for hydroengineering structure's operational safety has been developed based on fiber optic measuring transducer of absolute inclination. The principle of operation of the sensor rests on a free hanging shutter partly blocking the light flux when the sensor tilts, which results in the intensity change of the sensor's output optical signal. The specifications of the sensor are as follows: threshold sensitivity – 0.005 deg; dynamic range – 90 dB; measuring angle diapason – 00 – 50. The transducer can be used in precision measuring systems for monitoring absolute inclination of hydroengineering constructions' structural components.

INTRODUCTION

Long-term exploitation of dams, piers, derricks and other hydroengineering structures under aggressive influence of sea-water and high humidity results in gradual deterioration in reliability of their structural elements and impairment of load-carrying capacity of a structure as a whole. In order to prevent eventual accidents it is necessary to monitor technical condition either of some structural components or of a construction as a whole The most widely used evaluation technique of health of engineering constructions is visual inspection, which, not being the most precision method, brings about significant time consumption and, perhaps most importantly, the results received depend greatly on personnel skill, weather conditions, specific character of the construction under examination, etc. Besides, a lot of important structural components are sometimes inaccessible to visual inspection. That is why the development of precision reliable and universal hardware for hydroengineering structure health monitoring is regarded as a problem of vital importance. Any health monitoring system is based on measuring transducers which perform transformation of physical field parameters to be measured into easily registered form, for instance, into an electrical signal. Besides electrical measuring elements and communication lines can gradually fail under the influence of moisture and atmospheric air.

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