Method and device for measuring multiple spot dynamic flexibility/displacement by self caliberating self coding imaging method

Abstract

The multipoint dynamic flexibility / displacement measurement device includes target set on the measured object, photoelectronic camera system and computer. The target includes two light sources in regular shape and separated by certain distance. The present invention also provides the self calibrating and self coding imaging process for the multipoint dynamic flexibility / displacement measurement with the said device. The present invention has the advantages of self calibration of imaging magnification, self coding of the target and simple dynamic measurement.

Description

technical field [0001] The invention relates to a photoelectric measurement technology, in particular to a multi-point dynamic deflection / displacement measurement method and device by self-calibration and self-encoding imaging method. Background technique [0002] The vertical and lateral deformation of beams of bridges and other building structures under the action of self-weight and load is called deflection; while the lateral deformation of bridge towers under the action of cables and wind loads is called displacement, which is generally measured by the relative distance between the top of the tower and the base of the tower. The displacement representation of is collectively referred to as displacement below. Displacement directly reflects the construction quality, bearing capacity, and health of the structure, so there are strict regulations in bridge design, construction quality control, completion acceptance, and remaining life assessment. Therefore, during the const...

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Problems solved by technology

[0005] 1. Since the imaging lens shrinks the actual displacement d into an image, it is necessary to know the object distance accurately to obtain the accurate relationship between the displacement d and the image; and in actual engineering implementation, the installation position of the target is usually determined according to the site construction conditions, which is often different from the design installation position It is difficult to accurately measure the target object distance, so the relationship between the displacement d and the image cannot be accurately obtained, which will affect the accuracy of the measurement

[0006] 2. The target usually uses a point light source such as a cross-shaped cursor or an ordinary light bulb. The target itself has no definite coding characteristics, so the measurement can only be one-to-one measurement, and it is impossible to use one camera to shoot and measure multiple targets. Greatly increases the cost of measurement

[0007] 3. When it is necessary to measure the dynamic displacement of the whole bridge, it is necessary to use a computer to control multiple cameras to work synchronously. The control is complicated, and the data transmission and processing volume is huge. Usually, a very high-speed special image processing is required to be handled by a computer, so that the bridge Dynamic bit deflection / displacement measurement systems are very expensive

[0008] These problems make the original imaging measurement method flawed, which seriously restricts its application in real-time, all-weather, dynamic displacement monitoring of bridges.

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