KARMAN SWIRL TYPE FLOW MEASURING APPARATUS

摘要

P THE INVENTION CONCERNS AN APPARATUS FOR MEASURING A FLOW OF THE KARMAN WHIRLPOINT TYPE WHICH INCLUDES A SHEATH THROUGH OR FLOWS A FLOW OF WHICH THE FLOW OR THE SPEED TO BE MEASURED AND A MEMBER FOR FORMING SWIRLS IN THE FORM OF COLUMNS WHICH EXTENDS IN THE CONDUIT CROSS-SECTION TO THE DIRECTION OF FLOW OF THE FLUID. /P P ACCORDING TO THE INVENTION, A MEANS ARE PROVIDED 6 FOR DETECTING THE FREQUENCY OF THE FORMATION OF VIRTUALS AND CONVERTING THE DETECTED FREQUENCY IN AN ELECTRICAL SIGNAL, A COMPARATOR 20 HAVING AN INPUT TERMINAL RECEIVING THE CONVERTED ELECTRICAL SIGNAL AND THE OTHER RECEIVING A CLIP LEVEL SIGNAL AND A MEANS 16, 17 FOR DETERMINING THE CLIP LEVEL ACCORDING TO FLUCTUATIONS OF THE CONVERTED ELECTRICAL SIGNAL; SO THE COMPARATOR PRODUCES AN IMPULSE OUTPUT SIGNAL IN SYNCHRONISM WITH THE FREQUENCY OF FORMATION OF SWIRLS. /P P THE INVENTION APPLIES IN PARTICULAR TO THE MEASUREMENT OF AIR FLOW INTO THE INTAKE DUCT 'A VEHICLE. /P