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US 4,398,424 AGranted
Ultrasonic sensing
AssigneeMicro Pure Systems, Inc.
InventorLeigh R. Abts
Life of this patent
Estimating the term…
Abstract
A pulse-echo device with an improved signal-to-noise ratio, in which sound-transmitting material adjacent to the device is coated with a sound-absorbing layer, the layer being sound-impedance matched to the material so that much of the spurious ultrasonic energy travelling in the material passes through the layer-material interface into the layer where it dissipates instead of remaining in the material and reflecting back to the device.
Claims8
A pulse-echo device which uses low intensity signals for obtaining information about very small particulates in a fluid flowing through a pipe comprising:
- a transducer for producing low intensity energy waves,
- said transducer in order to reduce energy wave losses so as to enable the small particulates to be detected being in direct acoustical contact with the pipe which is comprised of a sound-transmitting material,
- a sound-absorbing layer coating said pipe material,
- said layer being sound-impedance matched to said pipe material so that most of any spurious sound waves travelling in said pipe material pass into said layer where they dissipate.
1 more element
Dependencies are inferred from the claim text.