Hewlett-packard Company

Agilent Technologies, Inc.

Henry E Karrer

J Fleming Dias

Richard J Pittaro

Richard D Pering

Alexander Tykulsky

A method is provided for fabricating an annular ring transducers for determining the velocity of a fluid flow. A novel and accurate flow measurement system is fabricated for measuring transit time of a fluid flow using chirp signals, and a pneumotachometer with annular ring transducers is also disclosed.

Method for fabricating an annular ring transducer

An accurate and reliable pneumotachometer with annular ring transducers for determining the velocity of a fluid flow is provided. A novel and accurate flow measurement system for measuring transit time of a fluid flow using chirp signals and a pneumotachometer with annular ring transducers is also disclosed.

Pneumotachometer having annular ring transducers

Apparatus comprising a test chamber, an electric solenoid and a pressure detector is provided to measure the partial pressure of oxygen contained in a mixture of gases. As a result of the paramagnetic properties of oxygen, an acoustic wave is produced in the gas mixture by the application of a pulsed magnetic field. The magnitude of the dynamic acoustic wave is dependent on the amount of oxygen present in the gas mixture. The solenoid generates a pulsating magnetic field in response to an electric signal provided by a signal source. The pressure detector measures the magnitude of the resulting acoustic wave and provides a signal whose amplitude is directly proportional to the amount of oxygen present in the sample gas.

Paramagnetic oxygen sensor

The capacitive fluid pressure transducers described herein comprise quartz bodies and diaphragms having suitable electrodes deposited thereon to form both sensing and reference capacitors in appropriate configurations for high fidelity measurement of relative blood pressure, said transducers being substantially unaffected by temperature and other environment factors.

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Palo Alto, CA, United States of America

Henry E Karrer