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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4038 датащи(PDF) 27 Page - STMicroelectronics |
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AN4038 датащи(HTML) 27 Page - STMicroelectronics |
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27 / 39 page  AN4038 Proximity sensor design Doc ID 022686 Rev 1 27/39 Figure 26 shows the measured detection distance versus the distance between the ground backplane and the sensor for a dielectric epoxy material (FR4). This test was performed using sensor #3 (see Figure 1). Figure 26. Detection distance versus distance between ground plane and electrode for dielectric material (FR4) Detection distance significantly decreases for an FR4 dielectric thickness less than 10 mm. For an FR4 dielectric thickness above 10 mm to maximum thickness, the increase of the proximity detection distance levels off. With regard to the dielectric epsilon factor (permittivity), at the same dielectric thickness, the lower the dielectric epsilon is, the greater the proximity detection distance is. The permittivity (dielectric constant) for: ● FR4 is 4.2 ● Air is around 1 |
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