Roots of industrial vision CCD image interference and the application of extremely fine coaxial lines

In industrial vision detection systems, the CCD module plays the role of "the eyes of the equipment." Once images appear with stripes, noise, flicker, or jitter, not only does it affect the accuracy of judgment, but it may also lead to misjudgment of the entire production line. Many engineers prioritize troubleshooting power supply, light source, or algorithms, but often ignore the most critical link—the signal line. Especially in industrial scenarios with strong electromagnetic interference and dense wiring, the high-speed low-level signal output by the CCD is extremely fragile. The core of truly stable images does not lie in filtering or metal casing, but in whether the correct transmission channel is selected: extremely thin coaxial cable (Micro Coaxial Cable).

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Why do image interferences occur frequently?

CCD module output signals are highly sensitive to interference, with various noise sources leaving traces in the image. Power ripple can cause horizontal stripes, ground potential difference can lead to image drift or judder, electromagnetic radiation from peripheral equipment can produce noise and flickering, and signal reflection may cause uneven brightness or trailing. For high-speed acquisition or high-resolution systems, these interferences are more pronounced and are often mistakenly attributed to insufficient algorithms or sensor performance issues.

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The structural advantages of extremely fine coaxial lines

The extremely fine coaxial cable is composed of a central conductor, an insulating layer, a shielding layer, and an outer sheath. Compared to ordinary FFC ribbon cables or flat cable bundles, its key advantage lies in the fact that each wire has an independent coaxial shielding. Since the shielding layer completely covers the signal conductor, external electromagnetic fields are not easily coupled into it, and cross-talk between different signal wires is also significantly suppressed. This structure makes the extremely fine coaxial cable very suitable for CCD modules that require high signal purity and fast transmission speeds, making it a reliable solution in industrial vision.

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Three, Engineering Practice: Key Points for Proper Use of Micro Coax

In practical projects, even when using ultra-fine coaxial cables, attention to detail is still required. Firstly, it is essential to ensure impedance matching; the impedance of the CCD output terminal, the cable itself, and the receiving circuit must be consistent, otherwise reflections will cause the image to produce periodic ripples. Secondly, the grounding method of the shielding layer should be handled properly; the shielding should be grounded at a single reliable point in the system; if grounding at both ends is necessary, it is necessary to avoid forming a ground loop to prevent additional interference. Moreover, the cable bundle should be kept away from strong interference sources such as motors and inverters, and the shielding structure of the connectors should be continuous to fully utilize the stability of the micro coax.

In industrial vision systems, many seemingly complex image interference problems are not due to algorithm or hardware failures, but rather stem from the most fundamental signal transmission stage. The extremely thin coaxial cable, with its complete shielding, high impedance consistency, and excellent flexibility, has become the mainstream choice for high-reliability vision detection equipment. True stable image quality often comes from the control of transmission details.

I am[Suzhou Hui Cheng Yuan Electronic Technology],Long-term focus on the design and customization of high-speed signal cable harnesses and ultra-fine coaxial cable harnesses, committed to providing customers with stable and reliable high-speed interconnection solutions. If you have any related needs or want to learn more, please contact Manager Zhang:18913228573 (WeChat number)。