The optical imaging system of an image measuring instrument is essentially an image acquisition process, that is, converting a visual image of a workpiece to be measured into a series of data that can be processed by a computer. As the beginning of the measurement and the source of the data, the quality of the workpiece image is directly related to the quality of subsequent image processing and measurement. Therefore, the Tianzheng image measuring instrument performs strict quality control on the three aspects of image illumination, image focusing and image output to ensure that the collected images are clear and well-defined, which is convenient for post-processing and measurement.
Tianzheng Image Measuring Instrument Optical Imaging System Solution
Image lighting
Lighting is an important factor influencing the quality of the image because it directly affects the quality of the input data and at least 30% of the application. Due to the variability of the measurement objects, the corresponding lighting device should be selected for each specific application example to achieve the best results. When measuring different parts of the workpiece, you also need to choose a different lighting method. For example, when measuring the surface features of a workpiece, it is necessary to use surface light illumination at different angles; to measure the edge contour size of the workpiece, it is necessary to use the contour source illumination.
The unique six-ring and eight-zone illumination source of the Tianzheng image measuring instrument eliminates the single-purpose single-use design feature of machine vision, and divides the ring surface light source into 48 arc-shaped units, which can realize flexible illumination for different workpieces to be tested. Program. This design can avoid the cost of redesigning the illumination source after replacing the measurement object.
Image focus
Reasonable choice of lens and design of imaging light path is one of the key technologies of measurement system. The workpiece under test is illuminated by the light source, and the imaging light is focused by an optical lens onto the photosensitive surface array of the CCD camera. All image information processed by the measurement system is obtained through the lens, and the quality of the lens directly affects the overall performance of the measurement system.
The professional lens used in the image measuring instrument has a very high contrast and resolution. It can not only adapt to different magnification zoom, but also provide automatic or manual focus, and also supports modular selection. The lens performance is very stable and the distortion is minimal.
Image output
A CCD camera is a photoelectric conversion device that converts an optical image formed by an optical imaging system into an electrical signal. In addition to examining the core photoelectric conversion devices, the CCD camera should also consider factors such as imaging speed, field of view range, and dot pitch accuracy. The CCD camera equipped with the image measuring instrument is mainly studied from the aspects of resolution, dot spacing and signal-to-noise ratio, which makes the image clear, the drawing is quick, and the noise is less, which is beneficial to the subsequent image processing.
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