CCD data acquisition and processing equipment used for high-speed displacement measuring

Abstract

The invention discloses a CCD data collecting and processing device which is used in high-speed displacement measurement, thereinto linear array CCD sensor outputs signal charge to A/D converting circuit for analog-to-digital conversion, the A/D converting circuit outputs digital signal to high-speed data buffer FIFO, the FIFO outputs pixel signal to signal processing circuit, it characterized in that: it possesses comparator selecting circuit, drive clock circuit and pixel counter, the comparator selecting circuit receives signal charge of said linear array CCD sensor, and outputs read, write signal to FIFO, outputs interrupting signal to signal processing circuit. The remarkable effects of the invention are: it can collect big signal output by CCD and process in real time, use resource of system to discriminate data information, eliminate useless information, realize collection in real time and in-phase process, and increase speed and efficiency of integral system.

Description

technical field [0001] The invention belongs to the technical field of CCD sensor measurement, and in particular relates to a CCD data acquisition and processing device for high-speed displacement measurement for high-speed acquisition and real-time processing of large-capacity data output by a linear array CCD sensor. Background technique [0002] Charge Coupled Device (CCD) is a widely used semiconductor optoelectronic device, which can convert incident light into signal charges and output them pixel by pixel. It has the characteristics of low noise, wide spectral response, high precision and sensitivity. There are two types of CCDs: linear array and area array. In the field of industrial automation, linear array CCD sensors are commonly used for various detections, such as non-contact size measurement, displacement measurement, etc. When performing high-speed measurement, the acquisition and processing of the output signal of the linear array CCD is the key to realize th...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the amount of data output by the CCD sensor is relatively large, and it is necessary to perform AD conversion and storage on all pixel signals, and finally use the center of gravity method for data processing, which makes the amount of data storage and processing large and consumes a lot of energy. Resources are time-consuming, and the speed of measurement and data collection is very slow. It is impossible to collect and process large amounts of data in real time, which affects the speed and effect of real-time collection. It cannot be used in fields that require high-speed displacement measurement.

Its disadvantages are: because the selected numerical comparator has to compare each data bit by bit, it is slower than the analog comparator, which will reduce the speed of data screening; in addition, the controller performs intermittent acquisition of the CCD output signal And processing, acquisition once and then processing again, the speed of measurement and acquisition data is slow, and real-time processing of signals cannot be realized; moreover, this method uses a two-dimensional CCD sensor for edge contour extraction, and cannot perform high-speed displacement measurement

The disadvantage of this method is: since the A / D converter and signal processor are not used for acquisition and subsequent processing of the CCD signal, and the actual position of the pixel is not identified by the counter, but the sample and hold value of the ramp signal is directly used as the The position of the exposure image point, so it is difficult to guarantee the accuracy of the measurement

[0006] To sum up, the existing CCD signal data acquisition and processing technology is usually slow in measurement and data acquisition, and the effect of real-time processing is not good, and it is impossible to realize uninterrupted acquisition and processing of CCD signals. Displacement measurement of slow-moving objects will fail for high-speed displacement measurement

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