In order to prevent electromagnetic interference from affecting the detection data of optical inspection equipment, comprehensive protection is required from the overall layout of the equipment, component protection to the optimization of the operating environment. First of all, it is very important to plan the layout of electrical lines reasonably during the design and installation stage of the equipment. The signal transmission line of the optical inspection equipment is laid separately from the power supply line of the high-power electrical equipment to avoid the two being parallel at a close distance. The signal transmission line uses a shielded cable. The outer layer of this cable is wrapped with a special shielding material, which can effectively block the interference of the external electromagnetic field and prevent the electromagnetic signal from entering the circuit of the detection equipment, ensuring that the detection signal remains pure and stable during the transmission process.
The protective design of the equipment shell is an important barrier against electromagnetic interference. The shell of the optical inspection equipment is made of materials with good electromagnetic shielding properties, such as metal shells. The metal shell can form a Faraday cage effect, isolating the external electromagnetic field outside the equipment and preventing it from entering the internal equipment to interfere with the circuit and optical components. At the same time, ensure that the various parts of the shell are tightly connected without gaps, and achieve good electrical conduction through welding, screw tightening, etc., so that the entire shell forms a complete shielding body to enhance the protection against external electromagnetic interference.
Carry out targeted electromagnetic shielding treatment on key components inside the equipment. For core optical components such as light sources and sensors in optical inspection equipment, use special shielding covers to wrap them. The shielding cover uses high magnetic permeability materials, which can effectively absorb and attenuate the surrounding electromagnetic fields and create a relatively pure electromagnetic environment for optical components. For electronic components such as circuit boards, rationally plan the line direction during design, add grounding lines, and introduce the electromagnetic interference signals generated by the equipment into the earth through good grounding measures, while reducing the impact of external electromagnetic interference on the circuit board, ensuring the normal operation of electronic components, thereby ensuring the accuracy of the detection data.
Optimizing the working environment of optical inspection equipment is also an important means to prevent electromagnetic interference. Place the equipment in an area away from strong electromagnetic interference sources such as large motors and transformers to reduce the impact of external interference sources on the equipment. If it is unavoidable to be close to the interference source, electromagnetic shielding devices such as shielding nets and shielding walls can be installed around the equipment. These shielding devices can further weaken the intensity of the external electromagnetic field, reduce the amplitude of the interference signal, and enable the equipment to operate in a relatively stable electromagnetic environment. At the same time, keep the working environment of the equipment clean and tidy, avoid stacking metal debris, and prevent metal objects from reflecting and refracting the electromagnetic field, which will aggravate the degree of electromagnetic interference.
During the operation of the equipment, filtering technology is used to further eliminate electromagnetic interference. Install a power filter at the power input end of the equipment. The power filter can effectively suppress the high-frequency interference signal in the power line and ensure that the power input to the equipment is pure and stable. For the signal transmission line, a signal filter can also be installed to filter out the electromagnetic interference signal mixed in the transmission process, so that the detection signal is clearer and more accurate. Through filtering technology, the impact of electromagnetic interference on the detection data can be effectively reduced, and the anti-interference ability and detection accuracy of the equipment can be improved.
Regularly perform electromagnetic compatibility testing and maintenance on optical inspection equipment. Use professional electromagnetic detection instruments to conduct comprehensive inspections on the electromagnetic shielding performance, grounding conditions, etc. of the equipment to promptly discover potential electromagnetic interference hazards. If it is detected that the electromagnetic shielding effect of the equipment has decreased or the grounding is poor, repair and adjust it in time. Check the shielding shell, shielding cover and other components of the equipment to ensure that they are firmly connected without damage or looseness. Check the line to see if the shielded cable is damaged and whether the interface is in good contact. Through regular maintenance, ensure that the equipment always has good anti-electromagnetic interference ability and continuously and stably output accurate detection data.
Strengthen the training of operators to make them understand the impact of electromagnetic interference on optical inspection equipment and the corresponding protective measures. When using the equipment, operators must strictly follow the operating procedures to avoid electromagnetic interference problems caused by improper operation. For example, when plugging and unplugging the connecting wires of the equipment, turn off the power of the equipment first to prevent instantaneous electromagnetic pulse interference. At the same time, operators should promptly discover abnormal conditions during the operation of the equipment, such as large fluctuations in test data and unstable equipment operation, and be able to preliminarily determine whether it is caused by electromagnetic interference, and take corresponding measures in time or notify professionals to handle it, to ensure that the optical inspection equipment operates normally in an environment without electromagnetic interference and to ensure the reliability and accuracy of the test data.
