What are the types of sensors in wearable devices?

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What are the types of sensors in wearable devices?

June 09 , 2023 0

I.Environmental sensors

Environmental sensors include: soil temperature sensor, air temperature and humidity sensor, evaporation sensor, rainfall sensor, lighting sensor, wind speed and direction sensor, etc., not only can accurately measure the relevant environmental information, but also can be networked with the upper machine to maximize the user's testing, recording and storage of the measured data. It is a scientific research, teaching, high-quality instrument, and is the first choice of laboratories and soil fertilizer stations of the Ministry of Agriculture, agricultural science research institutes and relevant agricultural environmental monitoring departments.
Function and realization principle of environmental sensor

In today's world, people are often in some environment that poses a threat to health, such as haze, indoor formaldehyde exceeding the standard. The PM2.5 portable detector, an air quality monitoring device composed of particulate matter sensors, can be worn on the human body, displayed alone, or used with a mobile phone and shared with friends.

PM2.5 portable detection Inhales the aerosol to be measured into the detection chamber through the air pump dust collector. The separation of the aerosol to be measured in the dust collector is divided into two parts. Part of it is filtered into clean air after the high efficiency filter, which is used as a protective sheath gas to protect the components of the sensor chamber from pollution of the gas to be measured. The other part of the aerosol enters the sensor chamber directly as the sample to be measured.

Particles and molecules will produce light scattering under light irradiation, but also absorb part of the light energy. When the energy. When a beam of parallel monochromatic light enters the measured particle field, it will be affected by scattering and absorption around the particle, and the light intensity will be reduced. In this way, the relative attenuation rate of the incident light can be obtained from the concentration field to be measured. The relative attenuation rate can basically reflect the relative concentration of dust at the site to be measured linearly. The magnitude of the light intensity is proportional to the strength of the electrical signal converted by photoelectric. By measuring the electrical signal, the relative attenuation rate can be obtained.

II. leather sensor

I'm sure everyone has this experience. When you have to perform a very important task, you feel nervous, anxious and sweaty. We can detect the process by which this psychological response is transformed into a physiological response through an electrical skin sensor.

The leather sensor is an important part of the lie detector, but it cannot test the user's happiness and sadness. We can only feel if the user's psychological state has changed. From this change, we can draw some conclusions. For example, a lie detector's electrical skin sensor can sense psychological changes as a subject speaks and determine whether or not he is lying.

For example, research has shown that during the course of the day, when people wake up in the morning and go to sleep at night, the human body has a low level of electrodermal response, and a certain time in the morning and afternoon, the level of electrodermal response is relatively high, which is the time when we study or work most efficiently.

III. Heart rate sensor

As a super weapon of personal health devices, interest rate sensors can track exercise intensity by monitoring heart rate, different exercise training patterns, etc., and can calculate health action data related to sleep cycles.

At present, there are two types of photoelectric heart rate sensors, which are measured by light reflection, and electrode heart rate sensors, which are measured by the electric potential of different parts of the human body.

Although the measurement accuracy of the former is poor, its advantage is that it is small, so all mobile terminals are currently measured in this way. When measuring electrocardiograms in hospitals, we often measure heart rate changes by measuring potential changes at different points in the body. This method is accurate, but we have to monitor two parts of the human body at the same time. When we use our phones and watches, we usually touch the products with one hand, so we can't do continuous monitoring.