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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VL53L1 датащи(PDF) 16 Page - STMicroelectronics |
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VL53L1 датащи(HTML) 16 Page - STMicroelectronics |
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16 / 35 page  Ranging performances VL53L1X 16/35 DocID031281 Rev 3 3.2 Accuracy, repeatability, and ranging error definitions 3.2.1 Accuracy definition Accuracy = mean distance – actual distance • Mean distance is the average of 32 measured distances • Actual distance is the actual target distance Accuracy can be affected by an offset error, a temperature drift, and a voltage drift. 3.2.2 Repeatability definition Repeatability is the standard deviation of the mean ranging value of 32 measurements. It can be improved by increasing the timing budget. A typical repeatability value for VL53L1X is from ±1 % to ±0.15 % depending on the timing budget and the ambient light. 3.2.3 Ranging error definition Ranging error = accuracy + repeatability error. This ranging error value is our metrics in the following performances tables. 3.3 Minimum ranging distance The minimum ranging distance is 4 cm. Under this minimum distance, the sensor will detect a target, but the measurement will not be accurate. 3.4 Performances in dark conditions Test conditions (including those described in Section 3.1: Test conditions) are: • Ambient light = dark • Timing budget = 100 ms unless mentioned • Long distance mode Table 6. Performances in dark conditions Parameter Target reflectance Min. value Typ. value Max distance (cm) White 88 % 260 360 (400 with TB = 140 ms) Grey 54 % 220 340 Grey 17 % 80 170 Ranging error (mm) ± 20 |
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