With the advent of dual-telecentric lenses, more and more visual inspection needs have been perfectly solved, and visual inspection has thus rapidly developed in the direction of higher accuracy, higher efficiency, and wider application range. In the dual-telecentric system, the use of parallel light sources increases system efficiency and raises its ability to solve problems to a new level. As the leading brand of domestic telecentric lens and parallel light source, Weishi Imagery pays attention to corporate responsibility and actively popularizes telecentric knowledge for people in the industry. This article aims to introduce the application of parallel light sources in the dual-telecentric system.
To understand the parallel light source, we must first popularize the principle of double telecentric lens.
As shown in the above figure, compared with the ordinary lens, the double telecentric lens has a diaphragm in the center of the lens, so that the light sources entering and exiting the lens are parallel light sources. This feature allows the double telecentric lens has the advantages of large depth of field, ultra-low distortion, the same lens magnification, so in the visual system, it can be used in many detection situations that traditional lenses can not solve, such as the measured object has a certain thickness, The situation beyond the range of depth of field, such as the situation where the uncontrollable jitter of the production line belt affects the accuracy of the measurement system, such as the case where the detection features are partially blocked due to the large and small distances in the conventional detection scheme.
However, the telecentric lens also has problems that cannot be solved. In our project experience, the following problems encountered in the screw (or spring) detection alone cannot be solved with the telecentric lens:
As shown in the figure above, due to the special structure of the screw (spring), when testing its pitch or thread angle, even if a double telecentric lens is used with the backlight source, the corners will be reflected at the corners and adjacent to it. The gray value at the opposite is such that the detection work cannot be performed. In order to solve this problem, we used a double telecentric lens with a parallel light source to perform a test that perfectly solved this problem. The image results are as follows:
It can be seen that the use of parallel light sources does not reflect light when the edges are neat, and the edges and angles can be easily determined.
In the double telecentric system, the parallel light source plays the following irreplaceable role:
First, improve the image contrast and signal to noise ratio Second, improve the image, especially edge sharpness, make full use of the camera resolution, improve the detection accuracy Third, eliminate the boundary effect, so that the edge position is determined Fourth, the ambient light interference is small The position of the parallel light source in the dual-telecentric system is irreplaceable. If you encounter similar problems in the image detection process, you can seek our help. b is recognized as the domestic leader of the dual-telecentric products and has many years of production. The application experience has been devoted to the promotion of telecentric lenses in China for many years. Its products have been successfully applied in the detection and measurement systems of a number of industries and have been highly praised by users.
To understand the parallel light source, we must first popularize the principle of double telecentric lens.
As shown in the above figure, compared with the ordinary lens, the double telecentric lens has a diaphragm in the center of the lens, so that the light sources entering and exiting the lens are parallel light sources. This feature allows the double telecentric lens has the advantages of large depth of field, ultra-low distortion, the same lens magnification, so in the visual system, it can be used in many detection situations that traditional lenses can not solve, such as the measured object has a certain thickness, The situation beyond the range of depth of field, such as the situation where the uncontrollable jitter of the production line belt affects the accuracy of the measurement system, such as the case where the detection features are partially blocked due to the large and small distances in the conventional detection scheme.
However, the telecentric lens also has problems that cannot be solved. In our project experience, the following problems encountered in the screw (or spring) detection alone cannot be solved with the telecentric lens:
As shown in the figure above, due to the special structure of the screw (spring), when testing its pitch or thread angle, even if a double telecentric lens is used with the backlight source, the corners will be reflected at the corners and adjacent to it. The gray value at the opposite is such that the detection work cannot be performed. In order to solve this problem, we used a double telecentric lens with a parallel light source to perform a test that perfectly solved this problem. The image results are as follows:
It can be seen that the use of parallel light sources does not reflect light when the edges are neat, and the edges and angles can be easily determined.
In the double telecentric system, the parallel light source plays the following irreplaceable role:
First, improve the image contrast and signal to noise ratio Second, improve the image, especially edge sharpness, make full use of the camera resolution, improve the detection accuracy Third, eliminate the boundary effect, so that the edge position is determined Fourth, the ambient light interference is small The position of the parallel light source in the dual-telecentric system is irreplaceable. If you encounter similar problems in the image detection process, you can seek our help. b is recognized as the domestic leader of the dual-telecentric products and has many years of production. The application experience has been devoted to the promotion of telecentric lenses in China for many years. Its products have been successfully applied in the detection and measurement systems of a number of industries and have been highly praised by users.
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