Tri-axis vibration sensor

27 October 2010 Analogue, Mixed Signal, LSI

Vibration analysis is an important tool in identifying problems in today’s factory environment. Bad bearings, worn gears, loose fittings and misaligned equipment can have a profound impact on plant productivity and employee safety. To address this growing demand for an accurate, stable and cost-effective approach to condition-based maintenance, Analog Devices has developed a tri-axis, wide-bandwidth, embedded vibration sensor that enables condition monitoring of manufacturing equipment.

The ADIS16223 iSensor accelerometer is a triple-axis, digital vibration sensor system that combines industry-leading iMEMS technology with signal processing, data capture and a convenient SPI (serial peripheral interface). The SPI and data buffer structure provide convenient access to wide-bandwidth sensor data. The 22 kHz sensor resonance and 72,9 kSps sample rate are suited to machine health applications and allow a system operator to identify failing equipment long before costly damage is sustained. The programmable digital filter offers low-pass and band-pass configuration options.

The chip is available in a ±70 G dynamic range, across three axes. The 22 kHz sensor resonance and 72,9 kSPS sample rate provide a flat frequency response from DC to 10 kHz, which is desirable for most machine health applications. With the SPI interface, configuration options include condition monitoring/alarm settings, capture buffers configuration control and embedded self test control. Users can also access serial number and device ID registers.

The data capture function has three different trigger modes, allowing in-system adaptation of the sensor to the end system’s product life cycle. Automatic data collection allows for periodic wakeup and capture, based on a programmable duty cycle. Manual data capture mode allows the user to initiate a data capture, providing power and read-rate optimisation. The event capture mode continuously updates the buffers and monitors them for a preset trigger condition. This mode captures pre-event data and post-event data and produces an alarm indicator for driving an interrupt. The ADIS16223 also offers a digital temperature sensor, digital power supply measurements and peak output capture.

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