Wearable sensors have affected the experience of wearable devices to a certain extent. In fact, sensors currently used in wearable devices have long existed, but applications have been blocked because they have not been miniaturized. So which sensors will be applied to the wearable device? How important is the sensor to the wearable device?
Market research shows that the wearable device market will reach 123 million in 2016 and 411 million in 2020. In the wearable device market, although the initial growth of the market is gratifying, the overall size of the wearable market is still relatively small worldwide compared to the smartphone market with annual shipments of more than one billion.
Schematic diagram of forecasting various types of wearable equipment market by foreign market agencies in 2020, data map
Sensor on wearable deviceAccelerometer
In wearable devices, accelerometers can often be used to determine your steps and sleep quality. By measuring your movement speed, the accelerometer can "tell" the wearable device how far you have gone. If your wrist has not been moving, it will think you are asleep.
Altimeter
Monitoring the user's weight change is a very important feature of wearable devices, and the role of the altimeter is to calculate how many calories you burn, climb a few stairs, get fat or become thinner. The altimeter can detect how many floors you have climbed by changing the atmospheric pressure and combine the number of steps you take to make more accurate calorie consumption calculations.
Barometer
This handy little device can tell you whether it is rainy or sunny today. These sensors are often used in sports wearables.
Gesture control sensor
This is a sensor that detects changes in the movement of various parts of the body. The user can control the device with a few simple actions, such as waving a hand. For the time being, this technology is still in the development stage, but its future application may bring us a lot of surprises.
Gyro
These sensors improve the accuracy of motion and activity tracking. In general, the greater the number of gyroscopes, the better the results.
Optical heart rate monitoring
This device is located on your wrist and usually uses a red or green spot to detect your heart rate. This technology has been around for a while, but it was applied to wearables soon, mainly for sports enthusiasts, which allowed us to wave goodbye to the bulky chest strap heart rate sensor.
The importance of wearable sensorsThe importance of sports, environment and biosensors
The earliest wearable device was a simple pedometer based on a three-axis accelerometer. Subsequently, complex devices including sensor components such as pressure sensors and gyroscopes soon appeared on the market. These devices enable wearable devices to identify the type of activity the wearer is participating in, such as walking, running, climbing, etc., and tracking their sleep cycles. At the same time, the temperature and humidity sensors enable the wearable device to more accurately measure parameters such as calories burned during exercise.
This trend of integrating more sensors into wearable devices will accelerate in the next few years. In particular, we will see more and more integrated motion and environmental sensors, as well as emerging biosensors. Biosensors are now available in stand-alone wearable medical monitors, and many consumer devices now offer heart rate measurement. But in the next few years, consumer devices will integrate a wider range of biosensors, such as spectral sensors that measure blood oxygenation, blood pressure and blood sugar levels, and skin resistance sensors that determine sweat levels and pH.
Advantages of integrating more sensors
The obvious advantage of integrating more sensors is that it increases the functionality of the device, allowing it to measure more parameters. In addition, the accuracy of the collected data can be improved.
For example, using information from other sensors to determine the type of activity the wearer is engaged in helps to select a more appropriate algorithm to process input from the acceleration sensor, making activity tracking more accurate. In addition, combined with data from numerous sensors, the device can extract more useful information to the user, for example, using heart rate, acceleration sensor data, and skin resistance sensing to measure a person's stress level.
Microphone component
In addition to the motion, environment and biosensors mentioned above, it is also possible for wearable devices to increase the use of microphone sensing elements. But the goal is not to provide the wearer with more information, but to help the device perceive its usage context in order to determine what information is useful to the wearer and how to deliver the information in an optimal manner. For example, if the device hears the roar of a jet engine, it can infer that the wearer is flying, monitor how long it has been sitting, and then adjust the recommendations for sleep and exercise to help the wearer cope more effectively with fatigue and dehydration. And time difference reaction.
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