According to the latest "Infrared Sensing Application Market Report of 2018" by LEDInside, the reflective heartbeat oxygen sensor has been fully introduced into smart watches and smart bracelets, driving the demand for infrared optical components to grow significantly. Apple, the market share, has a new generation of Apple Watch to improve the accuracy of heartbeat oxygen sensing. It is expected to use twice as many green LEDs and infrared LEDs, as well as larger photodiodes (Photodiode). Four to five times higher than before.
According to Wu Yingjie, research manager of LEDinside, because reflective optical sensing technology has the advantages of small size, low power consumption, fast response, etc., in addition to the introduction of smart watches and smart bracelets, it is gradually introduced into sports training, home care, and car driving. Monitoring and other market applications, but because the accuracy is still questioned by consumers, brand manufacturers are committed to improving the accuracy of sensing to gain consumer confidence.
Reflective optical sensor products need to have high linearity, high sensitivity and good signal-to-noise ratio. The product design is divided into transmitting end and receiving end. In terms of the transmitting end, it is required to match the requirements of the computing program, so the wavelength of the LED product varies from brand to brand. It is common to use a green LED with an infrared LED to detect the amount of blood flowing through the wrist at a specific time to get the heartbeat value. If a red LED is used with an infrared LED, the difference between the deoxygenated hemoglobin and the oxygenated hemoglobin at a specific time can be obtained to convert the blood oxygen concentration. The main suppliers of infrared LEDs are OSRAM Opto Semiconductors (OSRAM OS) and Crystal.
The receiver product design uses photodiodes, especially large-area photodiodes with low dark current, providing fast response time and full reception of LED energy. Apple's next-generation Apple Watch is expected to use larger photodiodes, which are four to five times more in use than in the past. The main supplier of photodiodes is Guanglei.
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