The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1977
Filed:
May. 05, 1975
Applicant:
Inventors:
Cornelis Martinus van der Burgt, Eindhoven, NL;
Gerardus Andreas VAN Maanen, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01S / ;
U.S. Cl.
CPC ...
340 / ; 73560 ; 340 / ; 340 / ;
Abstract
For accurate measurements of the sound velocity in liquids, for example water, the propagation delay is measured between an ultrasonic wave which is emitted by a transducer and the wave which returns to the transducer upon reflection. By making the reflector spherical and disposing it at a distance from the transducer which is within 11/2 times the length of the Fresnel region of the emitted acoustic wave, a favorable ratio between the 1 .tau. and the 2 .tau. signal is obtained, which ratio can be further improved when the central portion of the reflector is slightly flattened.