High-performance 3 axis MEMS sensor that can be installed with ADcmXL3021 standard mechanical screws

Vibration is one of the most important information for achieving condition-based monitoring (CbM) of motors, pumps, and the bearings and encoders that make up them.

Measuring vibration makes it easier to isolate mechanical noise from electrical noise and provides additional information about the state of the machine, improving diagnostic accuracy. Also, it is valid to bring sensors closer to the source of vibration with the miniaturization of sensor size and overall form factors in improving diagnostic accuracy and real-time mechanical control.

Here we introduce the following 3 features of the high-performance 3 axis MEMS sensor ADcmXL 3021 that can be installed with standard mechanical screws, provided from Analog Devices.

Complete vibration detection system accelerates development of state reference maintenance

Various signal processing functions by built-in embedded processing

High performance MEMS vibration sensor that realizes state reference maintenance

ADcmXL3021 is a complete vibration detection system that combines high-performance vibration detection (using a MEMS accelerometer) with various signal processing functions.

The following features simplify the development of smart sensor nodes in state based maintenance systems :

Small, mountable form factors optimized for performance in dynamic environments

Full-function signal conditioning for vibration measurement

Application preprocessing reduces data flow injected into control loops

SPI data output for industrial networking flexibility

Electrical and mechanical tested to meet industrial performance requirements

ADcmXL3021 contains the following embedded processing, which can be accessed by the Serial Peripheral Interface (SPI).

Fast data sampling (220 kSPS)

Sample record length of 4096

Filtering

Window processing

Fast Fourier transform (FFT)

User-configurable spectrum alarms

Error flag

These embedded processings enable the acquisition of information in the time domain and frequency domain.

Analog Devices offers the ADXL354/355, an ultra-low-noise 3 axis accelerometer that can be used to monitor aging infrastructure, and the ADXL100x series of ultra-low-noise, broadband accelerometers. The ADcmXL3021 also supports excellent resolution with an ultra-low-noise density of 25 µg/√Hz.

The sensing bandwidth is as wide as DC to 10 kHz with a flatness of 5%, enabling us to track the main vibration characteristics of many devices.

MEMS vibrational sensing module of 3 axis / digital power output.

Measurement range : ± 50 g

Ultra low noise density  25 μg/√Hz

Broadband : DC to 10 kHz (5% flatness)

Embedded high-speed data sampling 220 ksps

FIR filter, 32 taps (coefficient)

High-pass filter cutoff frequencies : 1 kHz, 5 kHz, 10 kHz

Low-pass filter cutoff frequencies : 1 kHz, 5 kHz, 10 kHz

User-configurable filter bank (32 coefficients)

Spectral analysis by FFT

Long record length : 2048 bins per axis

Manual or timer-based (automatic) triggers

Window Options : Rectangle, Hanning, Flat Top

Multi-record averaging, up to 255 records

Alarm monitoring with defined spectrum, 6 alarms per axis

Capturing Time Domains with Statistical Indicators

Long record length : 4096 points per axis

Mean, standard deviation, peak, crest factor, skewness, kurtosis

Real-time data streaming - 220 ksps per axis

Burst mode communication with CRC-16 error checking

10 data records on each axis

Status Flag On-Demand Self-Test

Sleep mode with external and timer-driven wake-up

Digital measurement of temperature and power supply

SPI-compatible serial interface

Identification register : serial number, device ID, user ID

Single Power Operation : 3.0 V ～ 3.6 V

Operating temperature range : −40°C ～ +105°C

Automatic shutdown at 125 °C (junction temperature)

23.7 mm × 26.7 mm × 12 mm23.7 mm x 26.7 mm aluminum package

34.5 mm flexible 14 pin connector interface

Vibration analysis

State reference maintenance system

Machine state monitoring

Measuring instruments and diagnostic functions

Detection of a safety interruption

This "ADSP-CM408F EZ-Board" is equipped with the ARM Cortex-M4 and can be used as a microprocessor evaluation board.

In particular, it can be used not only for assessment of motor control, but also for other applications, with

• Floating-point manipulable 240 Mhz ARM-Cortex - M4
• High precision dual 16bit ADC
• 384KB SRAM memory
• 2Mb Flash memory
• CAN, SPI, UART, USB, Ethernet
• Quadrature encoder interface