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  • What is a nine-axis sensor and what does it do

    What is a nine-axis sensor and what does it do


    A sensor is a detection device that can sense the information being measured, and can convert the information into electrical signals according to certain rules for transmission, processing, storage, display, and recording. There are many types of sensors, such as sound sensors (common voice-activated lights), temperature sensors (electric kettles), etc., which are widely used in various electronic products.

    The so-called nine-axis sensor is actually a combination of three sensors: a 3-axis acceleration sensor, a 3-axis gyroscope, and a 3-axis electronic compass (geomagnetic sensor). The three parts have different functions and cooperate with each other. They are commonly used motion sensing and tracking components in electronic products such as drones, sights, mobile phones, tablet computers, and game consoles. They are used in interactive control in various software and games.

    Three-axis accelerometer, three-axis gyroscope, three-axis magnetometer, including motion sensing chip. It integrates a three-axis gyroscope and a three-axis accelerator on a single silicon chip, and also includes a digital motion processor, which can perform complex nine-axis sensor component fusion calculations.

    Three-axis accelerometer

    The acceleration sensor measures the acceleration in all directions in space. It uses the inertia of a “gravity block”. When the sensor is moving, the “gravity block” will generate pressure in the X, Y, and Z directions (front, back, left, right, up and down), and then use a piezoelectric crystal to convert this pressure into The electrical signal, with the change of motion, the pressure in each direction is different, and the electrical signal is also changing, so as to judge the acceleration direction and speed of the mobile phone. For example, if you suddenly push the phone forward, the sensor knows that you are accelerating forward.

    Three-axis gyroscope: Simultaneously measure the position, movement trajectory and acceleration in 6 directions. The single-axis can only measure the quantity in one direction, that is, a system needs three gyroscopes, and one of the three-axis can replace the three single-axis. The 3-axis is small in size, light in weight, simple in structure and good in reliability, which is the development trend of laser gyroscopes.

    A gyroscope is an instrument made of a gyroscope. The characteristic of the gyro is that it is very stable when rotating, and its axis of rotation is not easy to change direction. Using this feature, a gyroscope is manufactured, which is widely used. For example, gyroscopes can be used to navigate airplanes, rockets, and ships.

    The so-called three-axis refers to the three directions of length, width and height in space. The gyroscope is installed on the shelf that can be deflected at will in three directions, so it will not be affected by the flight attitude of the aircraft, rocket, etc.

    The three-axis gyro sensor is installed on the mobile phone or on the scope, and its stability can be used to make shooting more stable. For example, it is also very commonly used in some games, such as first-person shooting games, bowling games that require action simulation, and first-person racing games. Wait.

    The three-week accelerator refers to the three-axis acceleration of x, y, and z, which is the commonly used three-axis space. It is transmitted through the main controller through the movement of several counterweights and their coupling systems.


    The sensor needs to cooperate with the algorithm program

    As an integrated sensor module, the nine-axis sensor reduces the circuit board and overall space, and is more suitable for use in lightweight and portable electronic devices, such as sights, drone cameras, and some wearable devices. In addition to the accuracy of the device itself, the data accuracy of the integrated sensor also involves correction after welding and assembly, as well as matching algorithms for different applications. Appropriate algorithms can fuse data from multiple sensors, making up for the insufficiency of a single sensor in calculating accurate position and orientation, enabling high-precision motion detection and enhancing shooting accuracy.

    Post time: Apr-20-2022