Research on the Influence and Correction Algorithm of Illuminance Intensity of Photoelectronic Imaging Bridge Deflection Measurement Accuracy

Abstract

As a non-contacted non-destructive testing equipment, the bridge deflection measurement instrument based on the principle of photo-electric imaging has the characteristics of high measurement precision, strong dynamic and static deflection observation ability and long observation range, and has a vast application prospect in the field of bridge structural health monitoring. The photoelectronic imaging bridge deflection instrument obtains the deflection measurement result based on the target image, and the image quality is an important influential factor of the measuring accuracy. Illuminance intensity is an important factor affecting the image quality, and will have an important influence on deflection measurement in different weather conditions and different time periods. This paper studies the effect of the different illuminance intensity conditions on the accuracy of the photoelectronic imaging bridge deflection instrument, then a correction method of deflection measurement accuracy based on illuminance intensity measurement is proposed, and the brightness balance correction to the experimental pictures is refined.