― High performance MEMS vibration sensor modularized ADcmXL 3021
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
1. Complete vibration detection system accelerates development of 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
Highly integrated vibration detection system
ADcmXL3021 Function Block Diagram (Source : Extracted from ADcmXL3021 Datasheet)
2. Various signal processing functions by built-in embedded processing
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.
Time domain and frequency domain
3. High performance MEMS vibration sensor that realizes state reference maintenance
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.
The main features of ADcmXL 3021 are as follows
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
Package of ADcmXL3021
― Target applications
Vibration analysis
State reference maintenance system
Machine state monitoring
Measuring instruments and diagnostic functions
Detection of a safety interruption
Application sample picture
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