Microbridge unveils micro-airflow sensor

Microbridge Technologies has developed a micro-airflow sensor, integrated on-chip with analogue CMOS signal conditioning circuitry.

The chip provides analogue adjustability, using Microbridge's Rejustor technology.

The thermo-anemometer flow sensing principle, combined with a micro-flow channel with very high flow impedance, allows accurate sensing of low differential pressures.

Because the flow impedance is pre-defined at the die level, it significantly relaxes demands on subsequent packaging operations.

Individual units require only simple offset and gain compensation, accomplished with the on-chip rejustors, leaving barometric pressure correction and temperature correction to be implemented in 'standard' post-sensor lookup tables.

This eases field replacement of micro-airflow sensors because they do not require field calibration.

The high flow impedance improves robustness regarding variability of connection hoses, changing gas filter properties, and humidified air.

The technology brings substantial price reductions, with improvements in performance and ease of use.

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