Browse Prior Art Database

Air Flow Sensor

IP.com Disclosure Number: IPCOM000051552D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Pennell, GF: AUTHOR [+2]

Abstract

The fluid flow sensor element 10 consists of a ribbon made of polyvinylidene fluoride film sandwiched between two thin metal layers. Sensor 10 is attached at one end to a bracket 11 within fluid channel 12. Bracket 11 is attached to the side of channel 12 in a manner which allows it to be tilted to adjust the angle. Lead wires 13 and 14 connect the metal layers to an instrument or control circuit which produces monitoring signals resulting from the displacement of the sensor element 10 caused by fluttering or vibration in the fluid stream within channel 12. Baffle elements 15 and 16 at the entrance and exit respectively of air channel 12 create the necessary turbulence to cause sensor element 10 to flutter to thereby generate an AC voltage signal.

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Air Flow Sensor

The fluid flow sensor element 10 consists of a ribbon made of polyvinylidene fluoride film sandwiched between two thin metal layers. Sensor 10 is attached at one end to a bracket 11 within fluid channel 12. Bracket 11 is attached to the side of channel 12 in a manner which allows it to be tilted to adjust the angle. Lead wires 13 and 14 connect the metal layers to an instrument or control circuit which produces monitoring signals resulting from the displacement of the sensor element 10 caused by fluttering or vibration in the fluid stream within channel 12. Baffle elements 15 and 16 at the entrance and exit respectively of air channel 12 create the necessary turbulence to cause sensor element 10 to flutter to thereby generate an AC voltage signal. Alternatively, the sensor element 10 or the channel 12 may be structured to produce the desired turbulence to assure fluttering of sensor element 10.

This device may be used to check the air flow of any air moving system produced by blowers, fans, vacuum, etc., and is a relatively low cost flow sensing device. It may also be used in a liquid pipeline.

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