Device for measuring pressures and variations of pressure with time

• US 4,592,229 A
• Filed: 10/01/1984
• Issued: 06/03/1986
• Est. Priority Date: 10/19/1983
• Status: Expired due to Fees

• Current Assignee: Aaron'S Automotive Products, Inc., Deutsche Rentenversicherung Berlin-Brandenburg, Intercont Products, Inc.
• Original Assignee: Deutsche Rentenversicherung Berlin-Brandenburg
• Inventors: Butefisch, Karl-Aloys, Ahlbrecht, Horst
• Primary Examiner(s): WOODIEL, DONALD
• Application Number:
  US06/656,721
• Time in Patent Office: 610 Days
• Field of Search: 73/147, 73/180, 73/756, 73/714, 73/724, 73/726, 73/727, 73/DIG. 4, 244/1 R, 244/76 C
• US Class Current: 73/147
• CPC Class Codes: G01L 9/08 by making use of piezoelectric devices , i.e. electric circuits therefor
• CPC Class Codes: G01L 9/12 by making use of variations in capacitance , i.e. electric circuits therefor

Abstract

A device for measuring pressures and variations of pressure with time at surface of test objects, for example wind tunnel models, is equipped with a plurality of pressure-sensitive sensors (4) arranged on a carrier (3). The pressure-sensitive sensors (4) are seated flush with the surface in the carrier (3) and this, in turn, is arranged flush with the surface of the test object at the test location. In the carrier (3) an operational amplifier is provided for each sensor (4). The underside of each sensor (4) is connected via as short a line (10) as possible to the associated operational amplifier. At the carrier (3), connections (7, 11) for supplying the operational amplifiers (18) and for conducting the output signals are provided. All top sides of the sensors (4) are connected to each other and to a combined ground connection (5) of the operational amplifiers thru an electrically conductive coating.

Claims

1. Device for measuring pressures and variations of pressure with time at the surface of test objects, for example wind tunnel models, test vehicles and aircraft, comprising a plurality of pressure-sensitive sensors arranged on a carrier, wherein the pressure-sensitive sensors (4) are to be arranged flush with the surface in the carrier (3) and the latter is to be arranged with the sensors (4) flush with the surface of the test object (1) at the test location, in the carrier (3) an operational amplifier (18) is provided for each sensor (4), the underside of each sensor (4) is connected via as short a line (10) as possible to its associated operational amplifier (18), at the carrier (3) connections (4, 11) are provided for supplying the operational amplifiers (18) and for conducting the output signals and all topsides of the sensors (4) are connected to each other and to a combined ground connection (5) of the operational amplifiers (18) thru an electrically conductive coating (6).

2. Device as claimed in claim 1, wherein piezo elements or membranes connected as capacitances are provided as pressure-sensitive sensors (4).

3. Device as claimed in claim 1 or 2, wherein the carrier (3) is a semi-conductor component which comprises the sensors (4) and operational amplifiers (18) and which can be inserted in an associated holder.

4. Device as claimed in claim 1, wherein the electrically conductive coating (6) is a layer of aluminum or silver which has been vapor-deposited or spray-deposited.