The oximeter of Yuyue 78 78 rose to 299 is annoying enough, so someone planned to use a bracelet to measure blood oxygen, and the result was even more fire.
It is rumored on the Internet that Apple Watch and Huawei Watch test ham, and Huawei's can measure the heart rate and blood oxygen of ham.
Could it be that the domestic product has overturned again?
01
Apple can again, Huawei can't?
Recently, after the reminders of various expert doctors, blood oxygen has suddenly become a medical indicator that everyone is very concerned about, and then the finger clip oximeter that once cost less than 100 was quickly out of stock on various platforms.
At this time, some students were pleasantly surprised to find that smart watches of mobile phone brands such as Huawei and Apple also had built-in blood oxygen detection functions, so they tested everything around them.
The test subjects ranged from their wrists to the dog's front paws, from medicine boxes to ham sausages, from movable to immobile.
But it doesn't matter if it's a test, the two watches tied to the same ham, Apple's display measurement is unsuccessful, Huawei's actually measured the heartbeat and blood oxygen for the ham!
If these non-professional smart devices have errors, they cannot replace the work of the oximeter.
But the problem is that using a fish that rises to 299 to clamp ham sausages and bananas can actually test the heartbeat blood oxygen for others.
This error is a bit outrageous -
This time, the topic was hotly searched, and even activated the memories of many old netizens for the 18-year "Xiaomi Mi Bracelet Test Paper Heartbeat".
In fact, at that time, there were already many popular science explaining the principle of smart bracelets measuring human signs, and now the same problem is only that the protagonist has become Huawei, and the signs have become blood oxygen, it can only be said that although the Internet has memory, but netizens are stubble after stubble...
02
The smart bracelet does not actually measure blood oxygen
Although the smart bracelet measures blood oxygen, it actually does not measure blood oxygen, does this sentence sound very awkward?
First of all, it is necessary to explain that the oxygen content of the blood in the arteries is essentially the oxygen content of hemoglobin, which is responsible for transporting oxygen. In addition to direct blood testing, the general working principle of blood oxygen sensors is:
Red and infrared light is emitted by light-emitting devices, which can penetrate the blood vessels of the skin. Because oxygen-saturated hemoglobin will absorb more infrared rays, and oxygen-free hemoglobin will absorb more red light, the difference between the emitted and received light intensity can be measured by the algorithm, and the bleeding oxygen value can be indirectly calculated.
In other words, the sensor on the bracelet does not actually measure blood oxygen, but the difference between infrared and red light emitted and received by the measured object per unit time.
As for what the measured object is, the oximeter with the original price of 79 does not currently have such intelligence and cost performance.
Therefore, when under certain conditions, the optical signals of some objects are similar to human skin blood vessels, the sensor on the bracelet can only mechanically calculate a blood oxygen and heartbeat for this thing according to a fixed model. This is the inevitable problem of indirect measurement.
Back to the "problem" of Huawei Watch, compared to Apple, its biggest problem is actually that it has not added the live detection function, commonly known as the "anti-fool mechanism".
As a predecessor, Apple also ate this kind of stuffy stick for the gourd test in the early years, and the original Apple Watch could even directly measure blood oxygen to the air
03
The smart device that rolls over is much more than just a bracelet
In fact, many cameras, millimeter waves, infrared and other devices with intelligent optical sensors, rollover cases are considered "commonplace". Some time ago, the AI painting that was very popular on the Internet was precisely because of all kinds of outrageous rollovers that everyone laughed.
From a scientific point of view, almost all sensors have the potential to be "deceived". Because they all have specific use cases, it is easy to get strange results as long as they are detached from the intended scene and subjected to other interventions.
For example, there were once ride-hailing drivers who went out with more than a dozen mobile phones and "artificially created" traffic jams on the map, so that the system misjudged the congestion of the road section, thereby increasing the price of taxis.
Because the map estimates road congestion by locating the density of mobile phones, a basket of mobile phones placed on each vehicle is also recognized as a dense flow of people or vehicles, which also causes a large error due to the lack of biological recognition.
Of course, reality will really replace the total return of professional medical equipment with smart bracelets is less. Even with the Huawei watch GT3 pro that can measure body temperature, most people will honestly prepare another mercury thermometer.
If it is really needed, the vast majority of people will still go to the hospital honestly.
The real significance of smart devices is that their monitoring of heart rate, blood oxygen, and body temperature is carried out anytime, anywhere, allowing us to have a general understanding of the body at all times. It costs hundreds of dollars to make a film casually, and for many people, the cost of making a film is quite high compared to a simple self-test at any time.
Whether it is the addition of biometric sensors or firmware updates to avoid it, it is not technically difficult.
But after all, it is a special period to demand surge functions, really to upgrade all equipment to the top configuration, the increased cost reflected in the price of how many people are willing to pay, may really be a problem
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