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SFH3410 Datasheet(PDF) 3 Page - OSRAM GmbH |
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SFH3410 Datasheet(HTML) 3 Page - OSRAM GmbH |
3 / 8 page 29.06.2006 page 3 of 8 light sensor. Figure 4 shows the spectral sensitivity of a standard silicon photo transistor, an OSRAM ambient light sensor of the first generation and the human eye (V- lambda curve). Figure 4: Spectral sensitivity of a standard Si-detector and an ambient light sensor (SFH 3410) compared to the human eye (V-lambda) Because the IR portion of the spectral sensitivity of the ambient light sensor is greatly reduced compared to a standard Si- detector (see Figure 4), it is less sensitive to the effects of different lamps. Figure 5 shows the signals of the ambient light sensor SFH 3410 received from different lamps of the same brightness compared to the signals of a standard Si-detector. Figure 5: Signals received by a standard Si-photo detector and the ambient light sensor SFH 3410 for different light sources at the same brightness (500lx) The difference of the signals indicates the accuracy of the brightness measurement. In the case of the standard Si-detector the signals vary by more than a factor 8 between light bulb and fluorescent lamp. This factor is reduced to 3 for the ambient light sensor, which therefore provides a much better accuracy for the brightness measurement. Measuring ambient light levels (brightness) Ambient light sensors are photo detectors. They yield a photo current which is related to the illuminance. In most cases, the correlation between photo current and illuminance is linear 1. Figure 6 shows the photo current – illuminance relationship for the ambient light photo transistor SFH 3410. The efficiency of the sensor describes the amount of photo current the sensor yields for a certain illuminance. In the example of figure 6, the ambient light sensor yields a photocurrent of 300 µA at 1000lx. Hence the efficiency of the sensor is 0,3 µA/lx. The efficiency of a photo detector depends on the illuminance under which it is operated. A change of the efficiency results in a deviation from the photo current - illuminance correlation. The linearity of a detector describes the magnitude of this deviation. Figure 7 shows the linearity for the ambient light sensor SFH 3410. The deviation from the linear correlation is < 5% within a brightness range of 30lx … 100klx. In lower light levels a correction might be necessary. 1 OSRAM offers the high accuracy ambient light sensor SFH 5711 with logarithmic output. |
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Similar Description - SFH3410_13 |
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