초록 ▼

A hand-held air flow measuring device comprises a plurality of transducer members mounted on a housing, each transducer member having a piezoelectric membrane which transmits and receives ultrasonic signals. The device causes at least two ultrasonic signal paths between the transducers wherein the s

A hand-held air flow measuring device comprises a plurality of transducer members mounted on a housing, each transducer member having a piezoelectric membrane which transmits and receives ultrasonic signals. The device causes at least two ultrasonic signal paths between the transducers wherein the signals are angularly inclined relative to each other. A timing arrangement is also provided for use with the flow measuring device for measuring and digitally displaying the measurement values.

대표청구항 ▼

[ We claim:] [1.]1. An airflow measuring device comprising three vertically disposed transducers arranged at an angle relative to each other, in a horizontal plane , and defining a triangular arrangement, each of said transducers being a generally tubular member having an outer surface, a piezoelect

[ We claim:] [1.]1. An airflow measuring device comprising three vertically disposed transducers arranged at an angle relative to each other, in a horizontal plane , and defining a triangular arrangement, each of said transducers being a generally tubular member having an outer surface, a piezoelectric membrane mounted on said surface, said three vertically disposed transducers being secured between two plate members, an upper plate member and a lower plate member, each of said plate members being generally spider shaped, having three angularly disposed arms, with each of said vertically disposed transducers being securely fixed in position between respective angularly disposed arms of said plate members.