Infrared sensing device
An infrared sensing device comprises an infrared transmitting module, a sensing unit, an ambient light compensation circuit and an output control circuit. The infrared ray emitting module comprises amodulator and an infrared ray light emitting source and provides modulated pulse infrared rays. The s...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | An infrared sensing device comprises an infrared transmitting module, a sensing unit, an ambient light compensation circuit and an output control circuit. The infrared ray emitting module comprises amodulator and an infrared ray light emitting source and provides modulated pulse infrared rays. The sensing unit comprises a light sensor and a photocurrent-to-voltage converter. The light sensor is used for sensing an infrared signal and an ambient light signal and converting and outputting a light current signal. The photocurrent-to-voltage converter receives a photocurrent signal and converts the photocurrent signal into a pulse signal. The ambient light compensation circuit receives the pulse signal and outputs an ambient light compensation signal. And the output control circuit receives the comparison voltage and the ambient light compensation signal respectively, synchronously detects the comparison voltage and the ambient light compensation signal, and outputs a measured signal or ameasured loss signal of t |
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