How wearable device track steps, monitor heart rate and assess sleep quality?

Others TOMORROW 11个月前 (06-11) 530次浏览 0个评论 扫描二维码
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As you know, all of these wearable devices are functional and powerful. So, how are so many functions integrated in such narrow space of wearable Device. And What technologies are used in it? Now let me show you the answers about them.

First, how does it track your steps?

A wearable tracker continuously senses the movements of the body on a 3-axis accelerometer. The data of movement is recorded all the time. All this data is stored in the tracker for further processing.How wearable device track steps, monitor heart rate and assess sleep quality?

 

The figure below shows a typical pattern of x-, y-, and z- measurements corresponding to vertical, forward, and side acceleration of a running person. no matter how the tracker is worn, at least one axis will have relatively large periodic acceleration changes. So, analyzing this data and detecting the acceleration period will give you accurate steps. Once it is worn and powered up, the tracker traces movement condition all the time, no matter the individual is walking forward, running fast, or even standing still.

How wearable device track steps, monitor heart rate and assess sleep quality?

 

Second, what technology are used to measure your heart rate?

The heart rate monitor on wearable Device is based on the technology called  photoplethysmography. As the heart beats, it causes that volume of blood rises and falls in vessels as time go on. So, the heart rate can be monitored by measuring changes of blood’s volume.

How wearable device track steps, monitor heart rate and assess sleep quality?

 

And the frequency of the changes can be measured by photodiode and laser diode. As the light enters the skin from the laser diode, the photodiode gets reflection from blood. Because the strength of reflection changes as the blood’s volume, the monitor will get a time variant signal whose frequency is same as the heart rate.

How wearable device track steps, monitor heart rate and assess sleep quality?

 

So, this explains how the heart rate monitor works.

And third, how does wearable device assess your sleep quality?

Assessing sleep quality is much more complicated than measuring heart rate and motion. In order to evaluate sleep quality, it is necessary to know first what data the sleep quality is related to. So, a lot of information related to sleep should be gathered, including:How wearable device track steps, monitor heart rate and assess sleep quality?

  • Heart rate
  • Body movement
  • Muscle activity
  • Brain waves (EEG)
  • Breathing
  • The movement of your eyes
  • So on

But, Currently, most of wearable device can only monitored heart rate and body movement by the heart rate monitor and accelerometer. Wearable device will make analysis based on the heart rate data and body movement’s condition to assess person’s sleep quality.

Because the lack of data related to sleeping quality, the result of analysis about sleep, is not accurate enough and it is suspicious. If someone need to make a sleeping quality evaluation accurately, it is essential to seek doctor for help.

Conclusion

What’s more, there are other technologies applied in wearable device, such as:

  • BluetoothHow wearable device track steps, monitor heart rate and assess sleep quality?
  • Wireless LAN
  • Cellular network
  • Beidou navigation
  • NFC(Near Field Communication)
  • Camera
  • So on

All of these technologies who I mentioned above, have a common point that they are not new technologies. But they are combined and used for new products and new scenarios.

So, old technologies get newborn.

 

Translation:


如您所知,所有这些可穿戴设备都功能强大。那么,如此多的功能如何融入可穿戴设备这样的狭窄空间呢?它使用什么技术?现在让我告诉你关于他们的答案。

首先,它是如何跟踪你的步骤?

可穿戴追踪器不断感知身体在三轴加速度计上的运动。移动的数据始终被记录下来。所有这些数据都存储在跟踪器中以供进一步处理。

How wearable device track steps, monitor heart rate and assess sleep quality?

下图显示了与正在运行的人的垂直,前方和侧面加速度相对应的 x,y 和 z 测量的典型模式。无论跟踪器如何磨损,至少一个轴将具有较大的周期性加速度变化。因此,分析这些数据并检测加速时间将为您提供准确的步骤。一旦佩戴和通电,追踪器就会随时追踪运动状态,无论个人是向前走,跑得快,甚至站立不动。

How wearable device track steps, monitor heart rate and assess sleep quality?

其次,用什么技术来测量你的心率?

可穿戴设备上的心率监测器基于称为光电容积描记术的技术。随着心脏的跳动,随着时间的推移,它会导致血量上升和下降。因此,可以通过测量血液体积的变化来监测心率。

How wearable device track steps, monitor heart rate and assess sleep quality?

 

并且变化的频率可以通过光电二极管和激光二极管来测量。当光从激光二极管进入皮肤时,光电二极管从血液中反射出来。由于反射强度随着血液体积的变化而变化,监护仪将获得一个时间变量信号,其频率与心率相同。

How wearable device track steps, monitor heart rate and assess sleep quality?

 

所以,这解释了心率监测器的工作原理。

第三,可穿戴设备如何评估您的睡眠质量?

评估睡眠质量比测量心率和运动复杂得多。为了评估睡眠质量,有必要首先知道睡眠质量与哪些数据相关。所以,应该收集很多与睡眠有关的信息,包括:

  • 心率How wearable device track steps, monitor heart rate and assess sleep quality?
  • 身体运动
  • 肌肉活动
  • 脑波(EEG)
  • 呼吸
  • 你的眼睛的运动
  • 等等

但是,目前大多数可穿戴设备只能通过心率监测器和加速度计来监测心率和身体运动。可穿戴设备将根据心率数据和身体运动情况进行分析,以评估人的睡眠质量。

由于睡眠质量相关数据的缺乏,睡眠分析的结果不够准确,而且是可疑的。如果有人需要准确地进行睡眠质量评估,就必须寻求医生的帮助。

总结

更重要的是,在可穿戴设备中还应用了其他技术,例如:

How wearable device track steps, monitor heart rate and assess sleep quality?

  • 蓝牙
  • 无线网络
  • 蜂窝网络
  • 北斗导航
  • NFC(近场通信)
  • 相机
  • 等等

我上面提到的所有这些技术都有一个共同点,即它们不是新技术。但它们被结合起来用于新产品和新场景。

所以,旧技术得到新生。

 


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