The trend of “Quantified Self” is emerging, people are using digital biomedical information to monitor, manage and track their health and well-being.
With the rise of modern IoT, biometrics, and wearable devices, various sensors and image recognition technologies are becoming more and more important, and the application characteristics of IRLED have become an important auxiliary light source. And by combining the sensing device and recognition technology, it can be applied to special applications such as iris recognition and face recognition. It can also be applied to the biosensor of wearable devices, which can quantify the physiological state of the human body and become a new tool for health management.
Smartwatches not only measure pulse, but also blood pressure and many other important signs such as heart rate, temperature, and oxygen saturation. The ultimate goal is to enable these wearable devices to identify sudden illnesses more quickly, thus acting as a preventative measure, rather than saving the day after the onset.
How can LED biosensors measure biometric values on wearable devices?
The skin is illuminated using red LED and IRLED light sources, and then detected how much light reaches the other side. More oxygenated blood absorbs more infrared light, while oxygen-deficient blood absorbs more red light. Green light enters the skin by conduction, where it is scattered and partially absorbed by the blood. A small portion of the emitted light is scattered back to the photodiode and is detected by a complex integrated circuit. The blood volume varies with the heart rate and thus the absorption of light and photodiode signals follows the heart rate accordingly. The sensor determines blood oxygen levels by looking at the ratio of transmitted light.
In addition, the absorption of hemoglobin molecules depends on their access to oxygen. By measuring the PPG signal of red and infrared light a value of blood oxygen can be obtained.
Wide range of packaging products
Chengxing light biosensor LED package products include: XL-1608URC red + infrared series XL-1608PDC, XL-1608IRC, XL-3036-85 ball head infrared and infrared receiver transmitter series, etc. Multi-specification sensors of different wavelengths, more sensitive light-emitting diodes. This improves the signal quality and helps users to detect PPG, PTT, blood pressure, SpO2 and other physical signs information. These devices consume less power to meet the needs of high frequency measurement without shortening the battery life.
| 封装 | 商品名称 | 相关参数(电压、光辐射功率 、波段) | 厂家型号 |
| 0603 | 0603红外发射850nm | 0603红外发射850nm(IV:2-5mcd(Typ)@IF=20mA) | XL-1608HIRC-850 |
| 0603 | 0603 红外发射940nm | 0603 红外发射940nm(IV:5-20mcd(Typ)@IF=20mA) | XL-1608IRC-940 |
| 0603 | 0603 红外接收管 | 0603红外接收管集射极击穿电-Vceo：30V 峰值波长：880nm 集电极暗电流：150nA | XL-1608PDC |
| 2835 | 3036球头红外发射850（0.2w） | 2835IR/2835球头红外发射850 60度14*14 | XL-TD3036HIRC-850 |
| 3528 | 3528红外850（0.2w） | 3528IR/3528红外发射850 14*14 | XL-3528HIR-T202 |
| 3528 | 3528红外940（0.2w） | 3528IR/3528红外发射940 14*14 | XL-3528IR-T202 |
| 3528 | 3528接收管 | 3528IR/3528接收 光敏三极管 | XL-3528PDC |
| 0805 | 0805 红外发射850nm | 0805 红外发射850nm(IV:2-5mcd(Typ)@IF=20mA) | XL-2012HIRC-850 |
| 0805 | 0805 红外发射940nm | 0805 红外发射940nm(IV:2-5mcd(Typ)@IF=20mA) | XL-2012IRC-940 |
| 0805 | 0805接收管 | 0805接收管集射极击穿电-Vceo：30V 峰值波长：880nm 集电极暗电流：150nA | XL-2012PD |
Customized Solutions
Chengxing Light can customize the most suitable and efficient light-emitting diodes to meet the needs of customers under various conditions according to their different needs. We continue to strengthen cooperation and experience sharing with downstream terminals to reduce the introduction cycle and cost for customers and lower the input-output ratio at the application end.
Layout of future development
Infrared LEDs (IR LEDs) have a long history of development, and their applications have been seen everywhere in life. As cell phones and wearable devices gradually introduce bio-sensing and even bio-recognition functions, coupled with the fact that IR LEDs can be combined with applications such as the Internet of Things, the future market has considerable growth potential. Cheng Hsing Light will start from the market demand and policy direction, and constantly optimize and expand the market application direction, and devote to build the development of intelligent lighting, and use R&D and technology to promote the upgrade of products and provide users with more meaningful use and operation.
