Electronics Weekly
Small quantities of smoke and dust, even though hardly noticed by the human sensory system, can have detrimental effects on the functionality of various devices, even if appearing only in very small concentrations, said the firm.
Sharp has used pulsed LED signals with a length of 0.32ms to measure the background noise that could be caused by scattered light from external sources. An integrated processor subtracts the background noise data from the actual measured data.
Another advantage of using pulsed LED signals is a reliable recognition of even sporadically occurring small dust quantities which the sensor then translates into data peaks. This is a basic advantage against conventional detectors as these are using continuous light resulting in a much lower sensitivity.
The GP2Y1001AU has a power consumption of 0.1W with peak loads of 20mA max. Mechanical dimensions are 58x42x20.7mm, including all circuits required for signal processing. Fine adjustment of the GP2Y1001AU is performed through the external processor. The measured reference values are written back onto the EEPROM of the sensor to maintain measuring accuracy.
The sensor operates in the temperature range of -10°C to +65°C. Typical applications are control systems for ventilation and air conditioning as well as emission control for copiers and laser printers.
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