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ACOUSTIC SENSORS & MEASURING SOLUTIONS

Sensors & Probes

​THE ACOUSTIC PARTICLE VELOCITY SENSOR

The Microflown sensor is a MEMS based transducer able to directly measure acoustic particle velocity. The very small sized elements are created on silicon wafers under a clean room technology. The sensing element consists of two ultra-thin wires (thinner than a strand of human hair). These wires are platinum resistors that act as temperature sensors. They are powered by an electrical current which causes them to heat up. Local temperature variations cause changes in the wires resistance. When the acoustic particle velocity (sound) propagates across the wires, it asymmetrically alters the temperature distribution around the resistors (wires). The resulting resistance difference provides a broad band (20 Hz up to at least 10 kHz) linear signal with a figure-of-eight directivity that is proportional to the acoustic particle velocity. Due to the unique measurement principle, the Microflown requires a dedicated pre-amplifier, which is provided along with all probes.

ACOUSTIC SENSORS & MEASURING SOLUTIONS

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