Device and method for producing a steep-fronted pressure wave in a liquid

US5918265A · kind A · utility

Assignee

• Endress+Hauser Flowtec AG · CH

Inventors

• Herbert Oertel · Ettlingen, DE
• Frank Ohle · Steinen, DE
• Joachim Maul · Ehringshausen, DE

Key dates

• Filing date: Jun 3, 1998
• Grant date: Jun 29, 1999
• Expiry date: Jun 3, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M7/08
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This device (1) produces a steep-fronted liquid pressure wave which strikes a body (12) to be tested with an adjustable table pressure. The device has a measuring tube (10) within or to which the body (12) is fixed, and which has a pressure-proof observation window (13, 14) and a pressure-relief valve (15). A pressure tube (20) with a compression system (25) which compresses a gas is closed on one side by a first diaphragm (29) which forms part of a chamber (27) that is provided with a valve (25). The chamber is closed by a second diaphragm (19) located opposite the diaphragm (29). In tube (10), a piston (18) is movable on guides (17) up to a braking device. To carry out the method, an amount of liquid which only partially fills the tube (10) is applied to the pistons In the chamber (27), a pressure equal to half the bursting strength of the diaphragms (29, 19) is set. The pressure in the tube (20) is increased until the bursting strength is exceeded. Then the pressure in the chamber (27) is reduced to ambient pressure, thereby causing the two diaphragms (29, 29) to burst and the piston (18) with the liquid ahead of it to be accelerated toward the body (12). The piston (18) is stop…