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[原创] ADI ADcmXL3021宽带低噪声三轴振动传感器解决方案

关键词:MEMS 传感器 ADcmXL3021

时间:2019-09-20 10:56:52       来源:中电网

ADI公司的ADcmXL3021是完整的振动检测系统,组合了高性能振动检测(采用微机电系统(MEMS)加速度计)和多种信号处理功能,从而简化基于状态的监测(CBM)系统的智能传感器节点的开发.MEMS加速度计的典型超低噪音(26 μg/√Hz)支持极好的分辨率.宽带款(DC-10kHz 3dB平坦度)可跟踪许多机器平台的关键振动信号.信号处理包括高速数据取样(220 kSPS),4096时间样本记录长度,滤波,视窗,快速傅立叶变换(FFT), 用户可配置频谱或, 时间统计报警和误差标志.串行外设接口(SPI)提供存取寄存器架构,它包含了振动数据和各种用户配置功能.测量范围 ±50 g.ADcmXL3021为23.7mmx27.0mmx12.4mm铝封装.工作电压仅为3.3V,支持工作温度−40℃
到 +105℃.主要用在振荡分析,CBM系统,机器运行状况,仪表和诊断以及安全检测.本文介绍了ADcmXL3021主要特性,评估板EVAL-ADCM优势和特点,电路图和PCB设计图.

The ADcmXL3021 is a complete vibration sensing system that combines high performance vibration sensing (using micro- electromechanical systems (MEMS) accelerometers) with a variety of signal processing functions to simplify the development of smart sensor nodes in condition-based monitoring (CBM) systems. The typical ultralow noise density (26 μg/√Hz) in the MEMS accelerometers supports excellent resolution. The wide bandwidth (dc to 10 kHz within 3 dB flatness) enables tracking of key vibration signatures on many machine platforms. The signal processing includes high speed data sampling (220 kSPS), 4096 time sample record lengths, filtering, windowing, fast Fourier transform (FFT), user configurable spectral or time statistic alarms, and error flags. The serial peripheral interface (SPI) provides access to a register structure that contains the vibration data and a wide range of user configurable functions.

The ADcmXL3021 is available in a 23.7 mm × 27.0 mm × 12.4 mm aluminum package with four mounting flanges to support installation with standard machine screws. This package provides consistent mechanical coupling to the core sensors over a broad frequency range. The electrical interface is through a 14-pin connector on a 36 mm flexible cable, which enables a wide range of location and orientation options for system mating connectors. The ADcmXL3021 requires only a single, 3.3 V power supply and supports an operating temperature range of −40℃ to +105℃.

ADcmXL3021主要特性:

Triaxial, digital output MEMS vibration sensing module
±50 g measurement range
Ultralow output noise density, 26 μg/√Hz (MTC mode)
Wide bandwidth: dc to 10 kHz within 3 dB flatness (RTS mode)
Embedded fast data sampling: 220 kSPS per axis
6 digital FIR filters, 32 taps (coefficients), default options:
High-pass filter cutoff frequencies: 1 kHz, 5 kHz, 10 kHz
Low-pass filter cutoff frequencies: 1 kHz, 5 kHz, 10 kHz
User configurable digital filter option (32 coefficients)
Spectral analysis through internal FFT
Extended record length: 2048 bins per axis with user configurable bin sizes from 0.42 Hz to 53.7 Hz Manual or timer-based (automatic) triggering
Windowing options: rectangular, Hanning, flat top
FFT record averaging, configurable up to 255 records
Spectral defined alarm monitoring, 6 alarms per axis
Time domain capture with statistical metrics
Extended record length: 4096 samples per axis
Mean, standard deviation, peak, crest factor, skewness, and kurtosis
Configurable alarm monitoring
Real-time data streaming: 220 kSPS on each axis
Burst mode communication with CRC-16 error checking
Storage: 10 data records for each axis
On demand self test with status flags
Sleep mode with external and timer driven wakeup
Digital temperature and power supply measurements
SPI-compatible serial interface Identification registers: factory preprogrammed serial number, device ID, user programmable ID
Single-supply operation: 3.0 V to 3.6 V
Operating temperature range: −40℃ to +105℃
Automatic shutdown at 125℃ (junction temperature)
23.7 mm × 27.0 mm × 12.4 mm aluminum package 36 mm flexible, 14-pin connector interface
Mass: 13 g

ADcmXL3021应用:

Vibration analysis
CBM systems
Machine health
Instrumentation and diagnostics
Safety shutoff sensing

图1.ADcmXL3021 MEMS传感器框图

ADcmXL3021评估板EVAL-ADCM

The EVAL-ADCM is a simple to use kit that allows quick performance evaluation of Analog Devices 3-axis, digital output MEMS vibration sensing module. The ADcmXL3021 module consists of 3 single axis, ultra low noise, high bandwidth ADXL1002 accelerometers, a fully implemented signal chain and MCU to incorporate configurable digital FIR filters, spectral analysis through internal FFT, configurable alarm monitoring, and time domain capture and statistical analysis. The EVAL-ADCM is ideal for evaluation of the ADcmXL3021 vibration sensing module since the kit readily provides full spectrum experience of all features of the module.

评估板EVAL-ADCM优势和特点:

The EVAL-ADCM kit includes one ADcmXL3021 module
Easily connects to PC for full features evaluation
Evaluation software for effortless configuration of the module, register setup, data display and data logging
High-speed SPI to USB adaptor for high data rate Real Time Streaming (RTS)

图2.评估板EVAL-ADCM外形图

图3.评估板EVAL-ADCM装配硬件图

图4.评估板EVAL-ADCM 电路图

图5.评估板EVAL-ADCM PCB设计图
详情请见:


以及

ADcmXL3021.pdf
02-047904-01-a-1.pdf
01-047904-01-b-1.pdf
eval-adcmkit-vibration_evaluation_user_guide_rev_1.pdf

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