Photoelectric sensing equipment for measuring building structure displacement

Abstract

A photoelectric measure used for measuring displacement of buildings is prepared as integrating CMOS video camera head, analog surface array video camera head, PSD and CCD with electronic theodolite; utilizing switchover unit to connect above said components to be an integral unit for enabling to switch on said components totally or partially to carry out operation.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a photoelectric measuring instrument for measuring displacement of building structures. Background technique [0002] With the continuous and stable development of the national economy, the state invests huge sums of money every year in the construction of roads, railways and other projects. In order to ensure the quality of construction, the construction of the project must be inspected. At present, the commonly used method is to fix a light-emitting diode marking target on the object to be measured, and image the luminous point of the marking target on the photoelectric measuring instrument through a photoelectric measuring instrument, convert it into an electrical signal, and then process it in real time through computer software. Obtain the vertical and horizontal two-dimensional displacement, vibration and other parameters of the measured object. There are two types of...

AI Technical Summary

Problems solved by technology

There are two types of photoelectric measuring instruments commonly used at present: one is a combination of a linear array CCD (charge coupled device) as a photoelectric converter and an optical theodolite frame, which is characterized by a high sampling rate and a disadvantage of low sensitivity. AC power supply is required at the measurement site, and x and y two-dimensional calibration must be performed

Moreover, since the length of the CCD is tens of millimeters, for such a large field of view, the lens distortion of the ordinary optical theodolite used for visual observation is serious, and the measurement error is very large.

The other is to use an area array CCD analog camera as a photoelectric converter combined with a long focal length optical lens, which is characterized by high sensitivity and small error, and its disadvantages are low sampling rate (up to about 25HZ) and poor frequency response

And because analog cameras are usually based on a video output signal, and this output signal uses a very narrow voltage fluctuation range to represent the change from black to white, so as long as there are several millivolts of external noise interference, it can affect the output video signal. Therefore, the output noise is large, and the image quality is poor. When doing dynamic deflection measurement, the image is blurred, the measured curve is seriously distorted, and the measured data has a large error. Metering method to measure out

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