What is the function of mobile phone sensor? A temperature sensor refers to a sensor that can sense a certain temperature and convert it into a usable output signal. According to the measurement method, it can be divided into two categories: contact and non-contact, and there are other classifications. What is the function of the following shared mobile phone sensors?
What is the function of mobile phone sensor? 1 What is a cell phone sensor?
Simply put, a sensor is a device or device in a mobile phone that can be measured and converted into usable output signals according to certain rules. Usually, this kind of sensor consists of a sensitive element and a conversion element. This article does not talk about complicated principles, but simply introduces the application scenarios of sensors.
What can a cell phone sensor do?
Light sensitive element
The light sensor can adjust the brightness of the screen according to the environment of the mobile phone at that time, and some can freely control the bright and dark state of the button breathing light. For example, in a particularly bright outdoor environment, the screen will automatically adjust to the brightest state, while in a dark environment, the screen brightness will decrease accordingly.
Distance sensor
Distance sensors are usually used in combination with light sensors. When you put the phone in the receiver position, the distance sensor will measure the distance between the phone and the ear. This different measured value will trigger corresponding functions, such as screen off or automatic screen lock. , and can also be used with various protective covers.
gravity sensor
Nowadays, the mobile phone screen is getting bigger and bigger, and the horizontal screen function that was once considered unnecessary has long been popular. When watching photos and videos, we usually operate the mobile phone sideways. In some games, gravity sensors can also be used to achieve richer interactive control, such as balance ball and racing games.
Acceleration sensor
The concepts of acceleration sensor and gravity sensor overlap slightly, but they are actually different. Acceleration sensor is a multi-dimensional measurement, which mainly measures some instantaneous acceleration or deceleration actions. For example, measuring the moving speed of a mobile phone can trigger special instructions through the acceleration sensor in the game. This sensor will also be used in some daily applications, such as Tik Tok cutting songs, flipping mute and so on.
Fingerprint sensor
Since 20 13, fingerprint sensors have exploded in smartphones. It can automatically collect users' fingerprints, thus achieving the purpose of protecting privacy. However, mobile phones with fingerprint sensors can not only unlock devices, but also be combined with mobile payment. Both Apple Pay and Sumsang Pay interact on the premise of fingerprint sensor.
Gyroscope sensor
Remember the killer app when iPhone 4 first came out? That's right, it's a gyroscope. Usually, the mobile phone comes standard with a three-axis gyroscope, which can track the displacement changes in six directions. This kind of gyroscope is needed in some shooting or racing games we play every day, and many applications work with the help of gyroscope sensors, such as 3D photography and panoramic navigation.
magnetic field sensor
The magnetic field sensor uses magnetic resistance to measure the plane magnetic field, so as to detect the magnetic field strength and direction position. Generally used for common compass or map navigation to help mobile phone users achieve accurate positioning. If you are a part of the southeast and northwest, the electronic compass on the map is easy to locate.
GPS position sensor
The main function of GPS module is to receive the coordinate information of satellite through antenna to help users locate. With the popularity of 4G network, GPS is applied in more scenarios, such as remote location monitoring with intelligent hardware, or location finding after equipment is lost. Here, we need to distinguish a concept. Generally, mobile phones are equipped with A-GPS. The so-called A-GPS is based on receiving navigation satellite signals and positioning through the mobile network, which is more advanced than ordinary GPS.
Air pressure sensor
Air pressure sensors have been used in military mobile phones before, which are divided into variable volume air pressure sensors and variable resistance air pressure sensors. The change of air pressure will lead to the change of resistance or capacitance measurement. Generally, GPS can calculate your position, but for some height changes, air pressure sensors are needed to measure it. The mobile phone equipped with this sensor can measure how many floors you go to a day, or it can be used for indoor positioning. The internal air pressure sensor mainly tests the sealing degree of the equipment.
temperature sensor
This year, the three-proof mobile phone supporting thermal imaging test at MWC is unforgettable, which uses a temperature sensor. The temperature sensor is used to detect the temperature change of the mobile phone itself, and the degree of fever of the mobile phone can be seen. In terms of extended functions, the temperature sensor can also detect the temperature change of the outside air, even the current body temperature of the user.
hall sensor
Similar to the magnetic field sensor, the Hall sensor can convert the changing magnetic field into an output voltage, thus generating a potential difference across the conductor. Some mobile phones come standard with some protective covers. When the protective cover is closed, the phone will automatically lock the screen, and when the protective cover is opened, the device will automatically unlock.
Ultraviolet sensor/converter
The ultraviolet sensor uses the photoelectric emission effect to measure, the camera shoots the outdoor light source and measures the ultraviolet intensity by converting it into the discharge effect. Nowadays, mobile phones using this sensor are rare, and the stability of measurement needs further observation.
Heart rate sensor
Heart rate sensor is commonly used in wearing settings, but its application in mobile phones is generally set on the back of mobile phones. High brightness LED light source is used to illuminate fingers and convert them into corresponding data to measure heart rate. Fingers need to be stable during the test, otherwise the test results will be greatly biased.
Blood oxygen sensor
Like the heart rate sensor, hemoglobin in blood and oxygenated hemoglobin have different absorption rates of infrared light and red light. If two kinds of LED lamps, infrared light and red light, are used to illuminate fingers at the same time, the absorption spectrum of reflected light can also be measured, thus measuring the bleeding oxygen content.
What is the function of mobile phone sensor? 2 1, optical sensor
Optical sensors are similar to the eyes of mobile phones. The human eye can adjust the light entering the eye in different light environments. For example, when entering a cinema, the pupil will be enlarged to allow more light to enter the eye. The light sensor allows the mobile phone to sense the intensity of ambient light to adjust the brightness of the mobile phone screen.
Because the screen is usually the most power-consuming part of the mobile phone, the use of light sensors to help adjust the brightness of the screen can further extend the battery life. The optical sensor can also be used with other sensors to detect whether the mobile phone is put in the pocket to prevent accidental touch.
2. Distance sensor
The infrared ray emitted by the infrared LED lamp is reflected by the object and then received by the infrared detector, so as to judge the intensity of the received infrared ray and the distance. The effective distance is about 10 meter. It can sense whether the phone is attached to the ear to make a call, and if it is, it will turn off the screen to save electricity; The distance sensor can also be used in glove mode supported by some mobile phones to unlock or lock the mobile phone.
3. Gravity sensor
Through the piezoelectric effect. There is a weight in the gravity sensor integrated with piezoelectric sheet, and the horizontal direction can be calculated by the voltages generated in two orthogonal directions. When it is used in a mobile phone, it can be used to switch between landscape screen and portrait screen. When used in racing games, it can sense the horizontal direction and use the data in the game to rotate the driving direction.
4. Acceleration sensor
The principle of action is the same as that of gravity sensor, but the acceleration direction is determined by three dimensions, with low power consumption but low accuracy. Used in mobile phones, it can be used to count steps and judge the direction of mobile phones.
5. Magnetic field sensor
Measuring the change of resistance to determine the magnetic field strength requires shaking the mobile phone to accurately judge, which is mostly used for compass and map navigation.
6, gyroscope
Gyroscope can measure the angular velocity along one axis or several axes, which is an ideal technology to supplement the function of MEMS accelerometer. In fact, if the accelerometer and gyroscope are combined, the system designer can track and capture the complete action in 3D space, and provide the end user with more realistic user experience, accurate navigation system and other functions. The "shake" function in the mobile phone (for example, shake the mobile phone to draw lots ...), somatosensory technology, and the adjustment and detection of VR viewing angle are all applied to the gyroscope.
There are 24 GPS satellites running in a specific orbit above the earth, and they will continuously broadcast their position coordinates and timestamps to all parts of the world (timestamps refer to the total number of seconds from 65438 GMT+0970 065438 GMT+06543810 00000: 00). The GPS module in the mobile phone starts from the instantaneous position of the satellite and calculates the time difference between the time stamp of the satellite transmission coordinates and the receiving time. It can be used for positioning, speed measurement, ranging and navigation.
8. Fingerprint sensor
At present, the mainstream technology is capacitive fingerprint sensor, but ultrasonic fingerprint sensor also has a trend of popularization. When the capacitive fingerprint sensor works, the finger is one pole of the capacitor and the other pole is the silicon chip array. The fingerprint pattern is drawn by the micro-current generated between the micro-electric field carried by the human body and the capacitance sensor, and the distance between the peak and valley of the fingerprint and the sensor forms the capacitance difference.
The principle of ultrasonic fingerprint sensor is similar, but it will not be interfered by sweat and oil, and the recognition speed is faster. Can be used in mobile phones to unlock, encrypt, pay and so on.
9. Hall sensor
The principle of action is Hall magnetoelectric effect. When current passes through a conductor in a magnetic field, the magnetic field will generate a force perpendicular to the direction of electron movement, thus generating a potential difference across the conductor. It is mainly used for functions such as flip unlocking and screen locking. Apple's Smart cover and official mobile phone accessories of several brands have adopted this technology.
10, air pressure sensor
When the diaphragm is connected with a sensor or a capacitor, when the air pressure changes, the value of the resistor or the capacitor will change, thus measuring the air pressure data. GPS can also be used to measure altitude, but there will be an error of about 10 meter. If equipped with air pressure sensor, the error can be corrected to about 10 meter. It can also be used to assist GPS positioning and confirm floor location and other information. Apple's iPhone 6/6s series are equipped with air pressure sensors.
1 1, heart rate sensor
When the finger is illuminated by a high-brightness LED lamp, when the blood is pumped to the capillaries by the heart, the brightness (the depth of red light) will change periodically. Then these regular changes are captured by the camera, and the data is transmitted to the mobile phone for calculation, so as to judge the contraction frequency of the heart and get the number of beats per minute.
12, blood oxygen sensor
Hemoglobin in blood and oxygenated hemoglobin have different absorption rates of red light. The infrared light and red light LED are used to irradiate the finger at the same time, and the absorption spectrum of the reflected light is measured to measure the oxygen content in the blood. Can be used in the field of sports or health.
13, ultraviolet sensor
The photoelectric emission effect of some semiconductors, metals or metal compounds will release a large number of electrons under ultraviolet irradiation, and the ultraviolet intensity can be calculated by detecting this discharge effect. The main application is also in the field of sports and health.
On the whole, most of the first seven sensors are standard on smart phones, and fingerprint sensors are becoming more and more popular. Rear sensors are more common in smart bracelets and top advanced mobile phones. Through the function of these sensors, mobile phones can have more functions than you and I imagined, just like making mobile phones more and more "smart", don't you think?
What is the function of mobile phone sensor? Mobile phone sensors can also identify which sensors are supported by mobile phone hardware, providing a sensing tool that plays an important role in our daily life.
The distance sensor consists of infrared LED lamp and infrared radiation detector, which is located near the handset of the mobile phone. When we answer the phone, the distance sensor knows that the user is on the phone, and then the display screen will be closed to prevent the user from misoperation and affecting the call. Because the light sensor can detect the brightness of the environment, the software can automatically adjust the brightness of the display screen by using the data of the light sensor. When we play mobile phone at night, the sensor will sense the change of the surrounding environment, so the brightness of the display screen will decrease accordingly.
The main function of GPS position sensor is to receive the coordinate information of satellite through antenna and help users locate. The principle behind it is not only applicable to mobile phones, but also widely used in all positioning devices.
When we are watching photos and videos, we sometimes need to switch screens. At this time, the role of gravity sensor is reflected. It can switch between horizontal screen and vertical screen according to the change of mobile phone direction. In addition, taking pictures requires changing directions and some gravity sensing games, all of which require the participation of gravity sensors.
Gyroscope sensor is an essential component of some induction games. It is with this sensor that the interaction of mobile games has undergone revolutionary changes, and users can feedback the game in combination with the multi-directional operation of the body, not just the simple buttons.
The application of barometric tactile sensor is less, and the change of barometric pressure will lead to the change of resistance or capacitance measurement. Generally, GPS can calculate your position, but for some height changes, you need an air pressure sensor to measure it. In addition, when you need to measure air pressure in some outdoor applications, a mobile phone with an air pressure sensor can also come in handy.
Heart rate sensor is common in wearable devices, but its application in mobile phones is generally located on the back of mobile phones. The principle is to convert high brightness LED light source into corresponding data to measure heart rate.
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The sensor of mobile phone is the component that the chip on the mobile phone senses, such as temperature value, brightness value, pressure value and so on. There are many sensors working silently in the background in the mobile phone, which supports our foreground operation and is more convenient.
Mobile phone sensors detect all available sensors on Android phones and vividly show how they work through images. Mobile phone sensors can also identify which sensors are supported by mobile phone hardware, and provide sensing tools that play an important role in our daily life. Cell phone sensors can only detect changes.
If the property has not changed, it may display inaccurate temperature, distance, light and pressure values.