This paper proposes a new idea of detecting meter using image arithmetic- logic operation and
high-precision raster sensor. This method regards the data measured by precision raster as real
value, the data obtained by digital image-processing as measuring value, and achieves the aim of
detecting meter through the compare of above two datum finally. This method utilizes the dynamic
change of meter pointer to complete subtraction processing of image, to realize image segmentation,
and to achieve warp-value of image pointer of border time. This method using the technology of
image segmentation replaces the traditional method which is low accuracy and low repetition caused
by manual operation and ocular reading. Its precision reaches technology index demand according to
the arithmetic of nation detecting rules and experiment indicates it is reliable, high accuracy. The
paper introduces the total scheme of detecting meter, capturing method of image pointer, and also
shows the precision analysis of indicating value error.
In this paper, a new method of optical scanning measurement was put forward, using the semiconductor laser and octagon prism. This method realized on-line non-touch measurement of the necking value and necking position in the process of material tensile testing by the assist of machine scanning. The principle and key technical of this measuring method had been introduced, and the main factor to the measurement accuracy was analysed too. It is shown by test that this method is more accurate, faster and simpler than ever before for giving out the capability of material by omnipotence tensile machine.
The measuring way of verticality of elevator's guide way is studied in this paper and a measuring apparatus is made too. The apparatus regards the laser beam, emanating from the laser device, which can emit the perpendicular laser to the earth, as the measuring norm. The facula on the autodyne, which clings to the guide way during the measuring, is sampled to computer with a CCD camera and an image acquisition card. By computer image processing, the measuring apparatus can identify the displacement of the facula center. By this way it determines the verticality error of the guide way at the measuring position, which can be recorded automatically at the same time. For the facula after threshold segmentation, the apparatus can recognize it automatically. If it is circular, its center can be worked out by centroidal equation; if it is cirque, after edge detecting, its center can be figured out with Hough transform. For the Hough transform of circle, the dimension of its parameter space can be brought down from 3 to 2 with the derivative of the circle equation and thus its calculating quantity can be reduced greatly. The measuring way is proved by testing that it had improved more greatly and is more accurate, faster and simpler than ever before.
In the system of size measurement by laser scanning, the laser intensity is necessarily kept stability. But in practice, output intensity of laser is continuously attenuated as time passed, so that precision accuracy of detecting system becomes poor. The paper analyzes the effect of laser intensity changing on accuracy of size measurement by laser scanning, provides with the auto-measured circuit and the measuring methods of the output laser intensity, and the method of electrical compensation for intensity change. The method has been applied to the instrument of diameter measurement by laser scanning on line successfully, which is effective and feasible.
In this paper, a specialized instrument of measuring inclination and deflection is proposed, which is developed by adopting photoelectric detection technique combined with design technique of precision instrument. This instrument adopts one-dimensional position sensitive detector PSD as the sensor of position, using simple pendulum structure to measure the inclination between a surface being measured and the earth's core. the measuring principle, structural design of the instrument has been introduced. It makes emphasis on the application research of the position sensitive detector PSD based on photoelectric transform, the research of high-accuracy data acquisition and processing technique, the linearization calibration method of PSD, etc. The measurement result can be shown directly on liquid crystal display, at the same time, for being convenient to communicate with the computer, the instrument also can send measurement data by infrared transmission and the computer can gather the data by the same means. This clinometer is of simple structure, high response speed , high measuring accuracy, strong interference rejection ability , low consumption , high characteristic of performance-cost ratio.