Sensors simplify shock and vibration detection

Analog Devices has expanded its Isensor sensor family with the introduction of two integrated inertial sensors that simplify the task of embedded shock and vibration sensing in harsh environments.

The devices are based on Analog Devices' iMEMS inertial sensor cores.

The programmable ADIS16240 impact sensor delivers power efficiency and user configurability in embedded applications while detecting and storing critical events for subsequent analysis.

The programmable ADIS16220 digital vibration sensor provides designers with the capability to automatically capture profiles of subtle vibration shifts in machine performance and many other industrial applications that require wide-bandwidth sensing.

The ADIS16240 is a fully integrated digital shock detection and capture system that combines ADI's iMEMS technology with an embedded signal processing solution, enabling designers to cost-effectively convert critical motion data into valuable system information in low-power applications such as condition monitoring, impact detection, security sensing and tamper detection.

The device's low-power triple-axis shock and impact sensor and recorder includes an integrated on-chip programmable event capture buffer, which monitors for user-programmed shock thresholds and holds pre- and post-event data, time-stamp, temperature and voltage.

Programming features and data access are controlled from a standard SPI (serial peripheral interface) port, making the ADIS16240 compatible with many existing systems.

Once implemented in the system, the device operates autonomously, capturing multiple events for later analysis or providing real-time indication of excessive shock environments.

The ADIS16240 consumes less than 1mA in continuous sampling mode, making it ideal for use in portable or battery-powered security devices, remote safety monitors or products that monitor the condition of goods or shipments.

The ADIS16240 has a usable bandwidth of up to 1.6kHz.

The ADIS16220 is a digital vibration monitor that combines ADI's wide-bandwidth iMEMS sensing technology with an embedded signal processor and data capture system.

A digital interface, combined with a 22-kHz wide-bandwidth, high-g accelerometer, provides engineers - with or without MEMS design expertise - with the ability to design embedded vibration-monitoring capabilities into industrial systems through a convenient user interface, optimised power dissipation and user-configurable controls.

The fully integrated and programmable vibration sensor with an SPI interface captures 1,024 samples on each of three inputs, at 100kSPS (kilosamples per second).

Programmable software features, which include peak sample and hold, trigger source and threshold levels, internal filtering, and power management, make the device easy to tune to specific applications or operational scenarios, reducing time-to-market and maintenance costs.

The 22-kHz sensor bandwidth, +/-70-g dynamic range, and 100-kHz sample rate make the ADIS16220 effective for industrial applications, including safety controls, embedded vibration monitoring and bearing condition monitoring.

The internal high-rate-capture buffers allow complete event profile capture and ease the task of remote data transmission.

Data capture is configurable to be user-initiated, timer initiated, or event initiated, allowing flexibility to meet either minimum power requirements or real-time notification of system problems.

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