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  • IR-LED Detects Drivers in Microsleep
Oct 2010
MUNICH, Germany, Oct. 21, 2010 — A new infrared light-emitting diode (IR-LED) is being used to help recognize microsleep episodes in motorists. This new fatigue detection system requires a camera with a CMOS sensor that detects IR light at a wavelength of 850 nm, which isn’t visible to the human eye, and analyzes the image of the driver that is captured by the camera. This process all takes place unnoticed by the driver – even at night.

A new infrared light-emitting diode (IR-LED) from the Siemens subsidiary Osram Opto Semiconductors is designed to help recognize the hazardous microsleep that affects motorists. In addition to the IR-LED, this requires a suitable camera with a CMOS sensor. The sensor detects IR light at a wavelength of 850 nanometers, which isn’t visible to the human eye, and analyzes the image of the driver that is captured by the camera. And it all takes place unnoticed by the driver — even at night. (Image: Siemens)

The camera, which is mounted in the driver's field of vision, uses image analysis software to determine if the driver is fatigued or distracted. Thanks to its small size and integrated lens, which has a 40-degree angle of illumination, the SFH4236 type LED can be easily installed in the dashboard of a vehicle, for example, and directly illuminate the driver from the front, without producing shadows. IR-LEDs of this output class with integrated lenses have not been available until now.

Statistics from the German Traffic Safety Advisory Board show that 1300 people are killed in single-vehicle accidents on Germany's roads every year - accidents involving no other road users. It is estimated that at least 25 percent of these accidents are caused by microsleep. The fatigue detection system featuring the IR-LED from Siemens subsidiary, Osram Opto Semiconductors, could become a lifesaver in such cases.

Other areas of application for such high-performance IR-LEDs in motor vehicles include seat occupancy recognition, night vision systems, short-range surroundings detection and monitoring drivers' blind spots. The IR-LED has a service life of tens of thousands of hours, many times more than the average number of hours that a vehicle is operated in its service life. In other words, it will never have to be replaced during the average life of a vehicle

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A light-tight box that receives light from an object or scene and focuses it to form an image on a light-sensitive material or a detector. The camera generally contains a lens of variable aperture and a shutter of variable speed to precisely control the exposure. In an electronic imaging system, the camera does not use chemical means to store the image, but takes advantage of the sensitivity of various detectors to different bands of the electromagnetic spectrum. These sensors are transducers...
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