More and more machines need to have accurate motion sensing function to achieve autonomous moving ability, such as robots, unmanned aerial vehicles, autonomous vehicles and other applications, among which Inertial Measurement Unit (IMU) plays a key role. This text will introduce the application of IMU and the latest solution launched by ADI for you.
Industrial sensors improves setting accuracy of intelligent applications
More diversified intelligent applications need to accurately grasp the location, moving speed and directions of machines such as robots, unmanned aerial vehicles and autonomous vehicles etc., which used to apply GPS and consumer sensors to conduct positioning. However, these kinds of technology and devices have the problem of insufficient accuracy, which can’t satisfy the need of applications with higher accuracy requirements.
Consumer inertial sensors commonly used in mobile phones are disappointing in accuracy. However, new type high-performance industrial sensors can support accurate angle pointing and geolocation performance, meanwhile achieve necessary size and cost effectiveness requirements. The performance of new type industrial sensors is already close to the level of sensors applied in missile guidance. These new type industrial sensors have high reliability and precision with the architecture made with economical technology, which has unique advantages in the aspects of performance-cost ratio and performance-size ratio.
ADI catches the urgent need of the market and launches the latest precise Micro Electro Mechanical System (MEMS) IMU ---ADIS16505, which includes a triaxial gyroscope and a triaxial accelerometer. Each inertial sensor inside ADIS16505 combines the signal conditioning function that can optimize dynamic performance, and conducts calibration in the factory aiming at characteristics of each sensor like sensitivity, bias, alignment, linear acceleration (gyroscope bias) and point of percussion (accelerometer location) etc. Each sensor has a dynamic compensation formula used to provide accurate sensor measurement in all situations.
Compared with the complexity and investment involved in discrete design, the ADIS16505 can provide a kind of simplified, economic and efficient method to integrate accurate multiaxial inertial detecting technique into industrial systems. All necessary motion detection and calibration have been finished during the production process in the factory, which greatly shortens system integration time. In the navigation system, the tight orthogonal alignment simplifies the inertial frame alignment and provides serial peripheral interfaces (SPI) and register structures used for data collection and configuration control.
With a built-in triaxial digital gyroscope, the ADIS16505 supports the dynamic range of ±125°/sec, ±500°/sec and ±2000°/sec with the in-run bias stability of 2.3°/hr, angular random walk of 0.13°/√hr and 1 σ for x axis and y axis, and the axis to axis misalignment error of ±0.25°. In addition, it has a triaxial digital accelerometer with the dynamic range of ±78.4 m/sec2 and the in-run bias stability (x axis and y axis) of 26.5 μm/sec2, which supports triaxial, delta angle and delta velocity output. As for the sensitivity, bias and axial direction alignment calibrated in the factory, the calibration temperature range is from −40℃ to +85℃ with the functions like SPI compatible data communication, programmable operation and control, automatic and manual bias correction control etc. as well as the data ready indicator used for synchronous data acquisition that supports three kinds of external synchronous modes including being direct, scaled and output. It can conduct self-test of inner sensors and the flash memory as required, which adopts 3.0 V to 3.6 V single power supply (VDD), supports 14,700 m/sec2 mechanical shock survivability and operates during the temperature range from −40℃ to +105℃.
The ADIS16505 adopts 100-ball ball grid array (BGA) package with the approximate size of 15 mm × 15 mm × 5 mm, of which the exquisite volume is suitable for navigation, stabilization, instrumentation, unmanned and autonomous vehicles, smart agriculture and construction machinery, factory / industrial automation, robotics, virtual / augmented reality, Internet of Moving Things and other applications.
Depending on three decades of experience on designing inertial sensors, ADI engineered an unparalleled reliable high performance and size / cost effectiveness combination. By virtue of the industry-leading performance, systematic designers can rely more on these high-grade sensors instead of increasing tests, components, calibration or software assistance to get the performance improved. The performance of these IMU can make system accurately represent motion without being influenced by turbulence, vibration, wind, temperature and other kinds of environment conditions in order to achieve more accurate navigation and guidance and / or instrument stabilization.
This new type IMU series can go with the evaluation kit and breakout boards, the EVAL-ADIS2Z and ADIS16505-x/PCBZ respectively. The EVAL-ADIS2Z is an evaluation tool based on PC which can achieve basic demonstration, individual register access and high-speed data acquisition functions, as well as simplify the support of breakout boards connected with ADIS16xxx IMU products and the development platform. The ADIS16505-x/PCBZ breakout board builds prototype connection between each ADIS16505-xBMLZ IMU model and the embedded processor platform, which provides a kind of convenient methods. Each ADIS16505-x/PCBZ breakout boards also connect to the J1 of EVAL-ADIS2 evaluation system.
Precise motion detection is no longer the niche of a few applications. Along with the launch of mini IMU industrial grade precision sensors, more applications can double the improvement of product value through integrating high quality motion detection function and embedded contextual sensing function, which also represents the market opportunity with a bright future.
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