Impedance tube and sample holder

Patent metadata

Field	Value
Publication number	US-10345140-B1
Application number	US-201815951384-A
Country	US
Kind code	B1
Filing date	Apr 12, 2018
Priority date	Apr 12, 2018
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

An impedance tube and sample tube holder that includes a hollow tube, a first tube, a second tube, and a spool. The hollow tube has two halves which are detachable and can hold spacers and a sample. The first tube includes a first tube speaker end and a first tube spool end. The first tube has a speaker disposed at the first tube speaker end and microphones. The second tube includes an anechoic terminator tube end and a second tube spool tube. The second tube has microphones and an anechoic terminator at the anechoic terminator tube end. The spool holds the hollow tube with the spacers and the sample. The spool is attachable to the first tube spool end and the second tube spool end such that the sample is perpendicularly orientated to an incoming sound wave produced by the speaker.

First claim

What is claimed is:

1. An impedance tube and sample holder comprising:
a hollow tube including a lower half tube and a upper half tube such that the lower half tube and the upper half tube are detachable and correspond to form the hollow tube such that the hollow tube can hold spacers and a sample of acoustic metamaterial where the sample covers the entire cross-sectional area of the hollow tube;
a first tube with a first tube inner diameter, a first tube speaker end which is a closed end of the first tube, and a first tube spool end, the first tube having a speaker disposed at the first tube speaker end, and further including measurement microphones that are placed flush with the first tube inner diameter;
a second tube with a second tube inner diameter, an anechoic terminator tube end and a second tube spool end, the second tube having measurement microphones that are placed flush with the second tube inner diameter, the second tube having an anechoic terminator at the anechoic terminator tube end; and
a spool for holding the hollow tube with the spacers and the sample, the spool disposed within the hollow tube, the spool attachable to the first tube spool end and the second tube spool end such that the sample is perpendicularly orientated to an incoming sound wave produced by the speaker, the speaker disposed at a predefined distance from the measurement microphones.

Assignees

• Anderson Ryan Bruce
• Yost Bradley
• Stone Matthew
• Lei Tiffany
• Us Navy

Inventors

• Anderson Ryan Bruce
• Yost Bradley
• Stone Matthew
• Lei Tiffany

Classifications

• G01H15/00 Primary

  Measuring mechanical or acoustic impedance · CPC title

• G01N29/223

  Supports, positioning or alignment in fixed situation (mounting transducers per se G10K11/004) · CPC title

• G01N29/09

  by measuring mechanical or acoustic impedance · CPC title

• G01N29/045

  by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks (measuring resonant frequency G01H13/00; measuring strength properties by application of mechanical stress G01N3/00) · CPC title