Accelerometer Helps Archers Hit the Mark

When new products are introduced, manufacturers like to identify other potential applications beyond the one used to drive product development. Mounting an accelerometer on an arrow tip to provide ballistic measurements to evaluate bows probably was not on any accelerometer manufacturer’s list. However, that is what Full Flight Technology does to improve high-performance archery. Using Analog Devices’ ADXL346 3-axis digital accelerometer, Full Flight Technology’s Velocitip Ballistic System continuously measures arrow drag in flight to provide downrange performance data. Instead of being limited to point of impact information, the continuous measurement capability of the arrow-mounted system quickly and easily identifies factors important to improving arrow design and downrange performance.

For more information about ADI’s ADXL346 3-axis digital MEMS (micro-electromechanical systems) accelerometer, click here.

Silicon MEMS Gyro Takes on Fiber Optic Gyros

Mechanical gyroscopes use a top-like mechanism spinning at high speed to detect angular position and provide high precision but at a high price. In contrast, fiber optic gyros (FOG) have minimal moving parts and offer high precision as well with a medium to high-end pricing. Sensonor Technologies’ STIM210 gyro module targets both designs with low bias error over temperature, a bias instability of 0.5⁰/h and low noise of 10⁰/√h. Operating over a temperature range of -40 to +85⁰C, the MEMS-based gyro is insensitive to magnetic fields and has no intrinsic wear-out mechanisms.

For more information about Sensonor Technologies’ STIM210 MEMS gyro module, click here.

Smallest Sensor Week: Dual-Axis Gyroscopes Boast Smallest Packaging

With a 3 x 3 x 0.75-mm form factor, InvenSense Inc. lays claim to the world’s smallest dual-axis gyroscopes. Targeting optical image stabilization (OIS) in smartphones, the IDG-2020 is an x-y (roll and pitch) and the IXZ-2020 is an x-z (roll and yaw) dual-axis MEMS gyroscope.

Features in the gyroscopes designed specifically for OIS requirements include the ability to have a factory full-scale output of ±32 degrees per second (dps) for the highest sensitivity to detect the slightest hand jitter, high-performance 32kHz ADC sampling, a nominal drive frequency of 27kHz that makes the gyroscopes immune to interference from audible frequencies such as music or ambient noise, a high speed 20-MHz SPI serial interface, and more.

For more information about InvenSense IDG-2020 and IXZ-2020 dual-axis gyroscopes, click here.

Smallest Sensor Week: Dual-Axis Digital Accelerometer Boasts Smallest Packaging

The second of this week’s small sensors is the world’s smallest and most robust digital accelerometer from MEMSIC Inc. Using patented MEMS thermal technology manufactured with a standard 0.18 µm CMOS process and advanced wafer- level packaging (WLP), the MXC6226XC two-axis digital accelerometer fits within a 1.2. x 1.7 x 1.0 mm package.  Per the company’s analysis, this makes it approximately 50% smaller than competitive products.

The two-axis digital accelerometer can measure acceleration over a ±2 g range with an absolute  0g offset of less than ±50 mg as well as can detect four orientation positions and provide shake detection. The company’s thermal accelerometer technology uses no moving internal structures, so the accelerometer exhibits extremely high shock survivability (up to 50,000g).

For more information on the MEMSIC MXC6226XC two-axis digital accelerometer,
click here.

Smallest Sensor Week: Smallest 3-Axis Digital Gyroscope

With microelectromechanical system (MEMS) technology and semiconductor packages, sensor manufacturers compete to cram the most technology into the smallest package. This week, Sensor Tips will highlight products that the manufacturer says is the world’s smallest. Without performing the extensive research necessary to verify the claims, we’ll take their word for it. Users can take advantage of these products’ minute size and capabilities to add features and performance to portable electronic products.

The first smallest sensor is STMicroelectronics world’s smallest 3-axis digital gyroscope. Housed in a 3 x 3.5 x 1-mm land grid array (LGA) 16-pin package, the L3G3200D gyroscope provides a 16-bit data output on the interrupt and data-ready lines and it integrates low- and high-pass filters with user-selectable bandwidth. The gyro operates with any supply voltage within the range of 2.4 to 3.6V with selectable full-scale values of ±250/500/2000 dps.

For more information about STMicroelectronics L3G3200D 3-axis digital gyroscope, click here.

MEMS Gyroscope Provides Tactical Grade Performance

Tactical grade gyroscopes typically use fiber optic technology (a fiber optic gyro or FOG) to produce a higher performance level than an industrial grade product. With its ADIS16136 tactical grade iSensor® digital MEMS gyroscope, Analog Devices, Inc. (ADI) provides 3.5°/hr typical bias stability and ±450°/Sec angular precision. This tactical level performance comes in a matchbox-sized (35.6x44x13.8-mm) module weighing only 25 grams.

Consuming less than 1W, the gyroscope targets platform stabilization and control, navigation, robotics and medical instrumentation.

For more information about Analog Devices ADIS16136 digital MEMS gyroscope, click here.

MEMS IMU Delivers 10-Degree-of-Freedom Capability

Today, there are several sources for six degrees of freedom (DoF) sensors. However, when 6DoF is not enough, the newest solution from Analog Devices, Inc. (ADI) may be the answer. The ADIS16488 is a 10-DoF sensor that integrates a tri-axis gyroscope, tri-axis accelerometer, tri-axis
magnetometer and a pressure sensor into a single package. Based on microelectromechanical system (MEMS) technology, the four different sensors not only fit into a 66.04x 64.77×14-mm package, they provide high performance and stability.

With bias stability of less than 10 degrees/hr), other inertial measurement unit (IMU) parameters include:

• Triaxial, digital gyroscope with digital range
  scaling,  ±450°/sec dynamic range
• Triaxial, digital accelerometer, ±18 g
• Triaxial, delta-angle and delta velocity outputs
• Triaxial, digital magnetometer, ±2.5 gauss
• Digital pressure sensor, 300 mbar to 1100 mbar

For more information about Analog Devices ADIS16488 10-degree-of-freedom sensor, click here.

Applying MEMS Inertial Technology to Reduce Injuries

Analyzing athletes’ reaction to the extreme physical requirements of their sport leads to improved performance and avoids injuries. For competitive rowing, Roessingh Research & Development (RRD), a Netherlands research center, uses the Xsens MVN system developed by Xsens Technologies B.V. for its kinematics analysis.

The Xsens MVN system is a motion capture solution that consists of inertial sensors attached to the body by a lycra suit. Analog Devices provides the iMEMS(R) inertial sensing technology for the suit. In the suit, 17 motion trackers (MTx) containing more than 80 high-performance ADI iMEMS inertial sensors and 17 ADI Blackfin digital signal processors to analyze the rower’s motion.

For more information about Analog Devices iMEMS inertial sensing devices click here.

For more information about Xsens MVN system, click here.

Small Vibration Monitor Delivers Exceptional Low-noise Performance

A vibration monitor can prevent a myriad of problems – if it can fit within the monitored system’s space constraints and has the right performance. For noise sensitive applications with limited space, Analog Devices’ ADIS16228 iSensor vibration monitor could be that solution.

An embedded programmable processor in the MEMS-based vibration analysis system provides directional sensing and spectral analysis to identify and classify specific sources of vibration.

The noise performance of the 3-axis vibration monitor is specified at only 248 µg/ √Hz, across a dynamic range of ±18g, and the unit is configurable to ranges of 0 g to 1 g 0 to 5 g/, 0 to 10 g and 0 to 20 g.

Footprint and pin-for-pin compatible with the ADIS16210, the ADIS16228 has an extended operating temperature range of −40°C to +125°C.

For more information about Analog Devices ADIS16228 vibration monitor, click here.

Sensing Three Axes of Linear and Angular Motion in a 20-mm Footprint

There seems to be an insatiable demand to sense motion in the latest portable electronic products. For those with limited space, STMicroelectronics LSM330DL Micro-Electro-Mechanical Systems (MEMS) sensor could satisfy their requirements. In its 4 x 5 x 1mm plastic land grid array (LGA) package, the 6 degrees-of-freedom (6DoF) inertial MEMS module is almost twice as small as anything else in production according to the company.

The accelerometer portion has a user-selectable full-scale acceleration range from 2 to 16g and the gyroscope portion has angular-rate detection from 250 to 2500 dps along the pitch, roll and yaw axes. The co-packaged sensors provide inherently precise alignment of the two sensors’ reference axes. In addition, the mechanical sensing structure’s design
delivers excellent thermal and mechanical stability. For example, the angular rate sensitivity change vs. temperature
from -40 to +85°C is ±2% (typically) and angular rate sensitivity with a full scale setting of ±250 dps is typically 8.75 mdps/digit.

The 6DoF  sensor is software-compatible with ST’s latest-generation 3-axis digital accelerometers (LIS3DH) and gyroscopes (L3GD20).

For more information about STMicroelectronics LSM330DL inertial module, click here.

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