EmbedSense - Wireless Sensor and data acquisition system

2.4 GHz wireless sensor networks

MicroStrain's wireless sensor networks enable simultaneous, high-speed sensing and data acquisition from multiple wireless strain gauges, accelerometers, temperature, and millivolt inputs. The range of wireless sensing systems is ideal for both small scale applications requiring a few sensor nodes and large scale applications requiring hundreds of sensor nodes. OEM options are available for embedded applications.

Common features and benefits

• IEEE 802.15.4 DSSS nodes compatible worldwide
• Streaming rates up to 4KHz from multiple nodes
• Datalogging rates up to 2048 Hz
• On-board memory stores 1,000,000 measurements
• Programmable communication range from 70m to 2,000m
• Low power consumption for extended use
• Internal rechargeable battery

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EmbedSense® Wireless Sensor nodes are tiny, passive wireless sensor and data acquisition modules that are small enough to be embedded in a product, enabling the next generation of smart structures and materials.

Batteries are completely eliminated, which means that the embedded sensors and EmbedSense® node can be queried for the life of the structure. Because they can tolerate extreme g levels and high temperatures, sensor measurements can be made in applications where previously no data could be obtained.

EmbedSense® uses an inductive link to receive power from an external coil and to return digital strain, temperature and unique ID information. A reader coil is energized by an AC electromagnetic field from a 125 kHz signal supplied by the reader unit. TheEmbedSense® node picks up this energy and uses it to power its data acquisition circuits. Communication is accomplished by the node shifting the tuning of its internal antenna from a reflective state to an absorptive state, in accordance with data to be sent to the reader. The reader sees these shifts as amplitude modulation (AM) on the power signal and converts the AM to a recovered data stream and passes it on to the computer. When the reader sends a command to the module, it frequency modulates (FM) the power signal with command data, which is detected by the node.

EmbedSense® nodes can read data from multiple types of sensors, including semiconductor temperature sensors, thermocouples, strain gauges, pressure sensors, and load cells.

Applications

• Smart structures, materials and machines
• Intelligent medical implants
• Monitoring turbines and other high-speed rotational equipment
• Embedded process control
• Temperature monitoring of composite panels during autoclave cure process
• Monitoring physical parameters inside sealed containers