Balance between accuracy in the measurement range and price: cost-effective width measurement using online width gauges

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Contactless optical inspection equipment often faces challenges such as difficulty in beam expansion and high costs when used for inspecting wide sheets of material. Even if the issue of beam expansion is resolved, the high expenses still render it less practical. To address this issue, Lanpeng Measurement & Control has adopted a different approach, using a dual-probe system with adjustable spacing to measure the width. This measurement method also allows the measurement range to be adjusted according to the width of the sheets being produced, which makes it very convenient. As for why it can balance range accuracy and price, this article provides a brief introduction. LED point light sources are installed inside the 2 transmitting lenses; the light emitted by these point light sources is transformed into parallel beams by the lenses, which then travel toward the 2 receiving lenses. Parallel light beams are imaged on the photoelectric conversion element CCD chip through the lens in the receiving lens (Note: one transmitting lens and one receiving lens make up a set of photoelectric probe). When the object under test passes through the field of view formed by two parallel beams of light, virtual shadows appear on the image of the photoelectric conversion element, with widths L1 and L2 respectively. By processing and calculating the electrical signals generated by the photoelectric conversion element, the dimensions B1 and B2 corresponding to L1 and L2 can be determined. Adding B1 and B2 together with the net distance C between the two lenses yields the width dimension A of the object being measured. It is precisely because the online width measuring instrument uses two sets of small probes for width measurement that the problems associated with beam expansion and cost are resolved, resulting in a better cost-performance ratio. If the sheet being tested sways violently from side to side, potentially moving outside the measurement range of the small probe, it is possible to use a combination of a parallel light probe and a wide-angle probe for testing. The wide-angle probe has a large measurement range but lower precision; it is used to determine the position of the sheet, while the parallel light probe has high precision but a narrower range, and is used for actual measurement. By using the wide-angle probe to locate the sheet and then moving the parallel light probe to the corresponding position for measurement, width detection can be achieved. Technical parameters Model: KG01-SG400-A ； Measurement range: 260-400mm ； Width of the object under test: 300-380mm ； Measurement accuracy: ±0.03mm ； Repeatability: 0.01mm ； Measurement frequency: 2000Hz. Model: KG01-SY900-A ； Measurement range: 60-900mm ； Width of the object under test: 100-850mm ； Measurement accuracy: ±0.08mm ； Repeatability: 0.03mm ； Measurement frequency: 2000Hz. There are many different models of online width measuring devices; these are just two of them. It is possible to customize such devices for detecting sheets with wider widths, and they represent cost-effective solutions. Baoding Lanpeng Measurement and Control Technology Co., Ltd. Reference article: Lanpeng Measurement and Control – measurement and control software. You can leave me an online message to inquire about prices or provide your contact details; I will get in touch with you once I see it.