Oct. 20, 2021 ---- Apple’s latest AirPods 3 still feature an optical in-ear detection mechanism, according to TrendForce’s 2021 Infrared Sensing Market Trend - 3D Sensing, LiDAR, SWIR LED report. Through the integration of PPG (photoplethysmography) technology, the AirPods 3 contain an improved in-ear detection mechanism based on skin-detect sensors that are equipped with four SWIR (short-wave infrared) LED chips that have two different wavelengths, as well as two InGaAs photodiodes. Industry insiders indicate that the AirPods 3’s s...