This section provides overview, applications, and principles of motion sensors. Also, please take a look at the list of 5 motion sensor manufacturers and their company rankings.
A motion sensor is a detection device that senses the movement of an object as a physical quantity and outputs a signal. They are mainly used by attaching them to people or animals. It consists of a combination of an acceleration sensor and an angular rate sensor.
Motion sensors are used in a wide range of applications, from consumer products to industrial equipment. Examples of use are listed below.
Since motion sensors enable non-contact detection of human movement, they can be used in a wide range of applications.
The motion of an object in three-dimensional space can be expressed by acceleration and angular velocity in three axes. Motion sensors use this mechanism to detect object motion. Acceleration sensors and angular rate sensors are mainly used, at least one for each of the three axes.
The method and type of sensor employed vary with the design of each sensor. They can have a variety of characteristics, including those that capture overall movement and those that capture detailed movement at close range.
Motion sensors that detect living organisms without contact mainly use radiation temperature sensors and photoelectric sensors, among others. Sometimes called motion sensors, the most common type of sensor is one that detects temperature changes.
Against the backdrop of the spread of new coronavirus infections, the market for motion sensors is expanding. According to a study by a marketing firm, the market size is expected to grow from $5.7 billion in FY 2019 to approximately $9.3 billion in FY 2025.
The majority of the motion sensor market is dominated by photoelectric sensors. Among these, demand for CCD and COMS image sensors is likely to grow due to their use in drones and robots, as well as in accident prevention with in-vehicle cameras.
Motion sensors are also being introduced in factories, where the IoT is gaining momentum. They are used to improve manual processes that are not suitable for automation by measuring human movement and in systems that automatically inspect products and parts in the process of manufacturing.
In 2017, universities in the U.S. and the U.K. raised the issue of motion sensor security. Michigan State University in the U.S. pointed out that accelerometers can malfunction when given certain sound waves. According to published information, some sound waves can intentionally cause a traffic accident.
The University of Newcastle in the U.K. also pointed out the possibility of personal information being extracted from smartphone motion sensors. It appears that passwords and unlock PINs can be identified based on the timing of tapping for text input and the tilt of the smartphone.
If a web browser is given permission to access the motion sensor, the motion sensor information could be stolen simply by visiting malicious sites. Therefore, caution should be exercised when using smartphones.
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