Sound damper for ultrasonic waves

• US 6,382,033 B1
• Filed: 03/15/2000
• Issued: 05/07/2002
• Est. Priority Date: 10/09/1997
• Status: Expired due to Term

• Current Assignee: Krohne Messtechnik GmbH & Co. KG
• Original Assignee: Krohne Messtechnik GmbH & Co. KG
• Inventors: van Bckkum, Jan Aart, Roosnek, Nico
• Primary Examiner(s): Fuller, Benjamin R.
• Assistant Examiner(s): THOMPSON, JEWEL VERGIE
• Application Number:
  US09/525,849
• Time in Patent Office: 783 Days
• Field of Search: 738/612.8, 738/611.8, 738/612.7, 738/612.9, 181/247, 181/249, 181/265, 417/312
• US Class Current: 73/861.28
• CPC Class Codes: G01F 1/662 Constructional details

Abstract

The invention concerns, according to the first teaching, a sound damper for ultrasonic waves in a gas flow, with at least one damping element (3) that can be inserted into a line for the gas flow. In accordance with the invention, the sound damper for ultrasonic waves is characterized by the fact that at least one scattering unit (5, 6, 7) having a number of small reflective surfaces is located in the damping element (3).

Claims

1. An ultrasonic flow meter comprising ultrasonic transducers, each of said transducers emitting ultrasonic waves that are received by the other, wherein a damping element for ultrasonic waves is located between said ultrasonic transducers, said damping element being composed of a perforated, tubular body closed at one end, being filled with a number of scattering units comprising basically cylindrical pall rings having spoon-shaped, curved guide elements on their insides.

2. The flow meter according to claim 1, wherein said pall rings have square openings in their cylindrical surfaces.