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MEMS Ultrasonic Transducer Sensor: Promote AR / VR technology progress

Views: 15     Author: Site Editor     Publish Time: 2020-05-26      Origin: Site

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Augmented reality / virtual reality (AR / VR) systems are being increasingly used in various fields, such as entertainment, education, healthcare, and other industrial applications. With these technologies, users can simulate complex tasks or surgical operations in a virtual space. Sensing technology allows users to obtain a realistic experience in a virtual space through advanced and precise positioning / motion detection. The latest AR / VR system uses time-of-flight (ToF) technology to measure the distance to an object, and ultrasonic depth measurement transducer have attracted great attention.


Augmented reality / virtual reality (AR / VR) systems are being increasingly used in various fields, such as entertainment, education, healthcare, and other industrial applications. With these technologies, users can simulate complex tasks or surgical operations in a virtual space. Sensing technology allows users to obtain a realistic experience in a virtual space through advanced and precise positioning / motion detection. The latest AR / VR system uses time-of-flight (ToF) technology to measure the distance to an object, and ultrasonic sensors have attracted great attention.


The challenge to make AR / VR more real: reduce the size of ultrasonic sensors
With the various head-mounted display (HMD) AR / VR headsets,it is beginning to be available at affordable prices in 2016, the global AR / VR market has grown substantially, and by 2025, the market size is likely to exceed US $ 11 billion (Source: "Future Prospects for 2017 AR / VR Related Markets", Fuji Camry General Research). AR / VR systems were mainly used for entertainment applications such as games in the past, but their use is expected to increase in other areas, such as assembly, manufacturing, transportation, retail, education, and healthcare.
Global AR / VR market

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Using the latest model of AR / VR system, users can simulate complex surgical operations in the virtual space. A six-degree-of-freedom (6-DoF1) head-mounted display and hand controller make this application possible. In this way, a seamless synthesis between the human movement in the virtual space and the human movement in the actual space can be achieved. This is due to a sensor-based technology called position tracking 2, which uses the ToF method to measure the distance to an object.


ToF ultrasonic distance transducer technology measures the distance to an object based on the time difference between when light, infrared, or ultrasonic waves are reflected from the object and returned to the sensor. Whether it is optical or infrared ToF technology, although they are very accurate, they cannot be used for measurement in the presence of obstacles, they are suitable for measuring the distance from glass or other transparent objects. Ultrasonic ToF technology can accurately measure the distance to objects, even if these objects have high reflectivity, and this technology will not be affected by the object's lighting conditions, size and color. Traditional ultrasonic ToF sensors require complex signal processing and are too large to be embedded in home appliances


ToF solution with ultra-small MEMS-based sensors
TDK's solution to this challenge is CH-101, which is a new ultra-small ultrasonic ToF sensor, which is only one-thousandth the size of traditional ultrasonic ToF sensors. As the world's first MEMS-based ultrasonic sensor. It is a truly breakthrough product that combines piezoelectric micromechanical ultrasonic transducers (PMUT3) and energy-efficient DSP (digital signal processing) 4), low-power CMOS ASIC5 combined together in a small package measuring only 3.5 x 3.5 x 1.25 mm.


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CH-101 combines PMUT, high-efficiency DSP (Digital Signal Processor), and low-power CMOS ASIC in a small package measuring only 3.5 x 3.5 x 1.25 mm. one.Bats can fly freely in the dark without hitting objects, because they detect the position and relative speed of objects by sending pulsed ultrasound waves and receiving echoes from the objects. This method is called echolocation, and the same principle is also used for the position tracking of ultrasonic sensors.

The CH-101 has an embedded PMUT that can emit ultrasonic pulses and receive echoes from objects within the sensor's field of view. Combined with a variety of different signal processing, the product can be used in a variety of applications, including detecting the distance and location of objects, sensing the presence of objects and avoiding collisions. In addition, it requires very low power consumption, which is one hundred times lower than the power consumption of traditional ultrasonic sensors, thus providing excellent environmental performance.

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The existing optical ultrasonic sensor based on VR system combines an external sensor with a wired headset and a controller. The former emits infrared rays, and the latter responds to infrared rays to locate the user's location. The VR system using 200KHz ultrasonic transducer allows users to experience VR with just a headset and controller. The CH-101 ultrasonic sensor can be used for the focus plus all-in-one, an independent headset developed by HTC.

The CH-101 ultrasonic sensor supports a maximum sensing range of 100 cm, and the new product CH-201, which will be put into mass production at the end of 2019, supports a maximum sensing range of 500 cm. Due to the use of MEMS technology, the size of the sensors has become unprecedentedly small, we expect them to realize a series of applications, including products in AR / VR headsets, smart homes, drones, robots, smart phones and wearable devices.

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CH-101 is a MEMS-based ultrasonic sensor. Unlike optical ToF sensors, it can accurately measure the distance to an object without being affected by the size, color, and transparency of the object. In addition, it will not be affected by environmental noise, such as noise and noise in the surrounding environment.







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