11.30.16
The new IR Topled D5140 photodiode from Osram Opto Semiconductors requires considerably less pc board space than before. It enables more compact sensors to be produced for monitoring fitness levels, for example in fitness armbands. The spectral sensitivity of the D5140 has been optimized for visible light and allows precise heart rate measurements using red or green light. The component is also ideal as an ambient light sensor.
The IR Topled D5140 is a further development of the SFH 2440 photodiode that Osram Opto Semiconductors has recently introduced for fitness sensors. Just like the SFH 2440, the IR Topled D5140 is also ideal for optical sensors for pulse rate measurements, on the wrist for instance.
It works by shining visible light on the surface of the skin, some of which is absorbed or reflected to the detector. Because arterial blood absorbs more light than the surrounding tissue, the strength of the detector signal changes with the volume of blood through which the light passes. The periodicity of the signal indicates the heart rate.
The IR Topled D5140 is a further development of the SFH 2440 photodiode that Osram Opto Semiconductors has recently introduced for fitness sensors. Just like the SFH 2440, the IR Topled D5140 is also ideal for optical sensors for pulse rate measurements, on the wrist for instance.
It works by shining visible light on the surface of the skin, some of which is absorbed or reflected to the detector. Because arterial blood absorbs more light than the surrounding tissue, the strength of the detector signal changes with the volume of blood through which the light passes. The periodicity of the signal indicates the heart rate.