# US 8,464,575 B2 · Device and method for measuring the geometry of a workpiece

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- Number: US 8,464,575 B2
- Document ID: US8464575B2
- Status: Granted
- Kind: B2
- Application number: 12/842,381
- Filed: 2010-07-23
- Published: 2010-11-18
- Granted: 2013-06-18
- Earliest claimed: 2008-01-25
- Assignees: Marposs, S.p.A.
- Applicants: Ivan Basar
- Inventors: Ivan Basar
- Web page: https://patentgrep.com/patent/US8464575B2

## CPC

- G01B 13/02: for measuring length, width or thickness (G01B13/08 takes precedence)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

In order to improve a device for measuring the geometry of a workpiece in such a way that the geometrical measurements are particularly precise wherein the device comprises a housing having a flow channel in which there is arranged a reference nozzle for the passage of a test fluid therethrough and a first pressure measuring device for measuring a first pressure of the test fluid upstream of the reference nozzle and also a second pressure measuring device for measuring a second pressure of the test fluid downstream of the reference nozzle, it is proposed that the device should comprise a differential pressure measuring device for measuring the differential pressure of the test fluid across the reference nozzle.

## Claims

### Claim 1

A method for measuring the geometry of a workpiece, wherein a test fluid is arranged to flow through a reference nozzle located in a flow channel of a housing, wherein a first pressure of the test fluid is measured upstream of the reference nozzle and wherein a second pressure of the test fluid is measured downstream of the reference nozzle, wherein, in addition to the first pressure of the test fluid and the second pressure of the test fluid, the differential pressure of the test fluid across the reference nozzle is measured and/or in that the moisture content of the test fluid is measured, wherein there is determined a deviation between a measured differential pressure of the test fluid and the difference between a first measured pressure of the test fluid and a second measured pressure of the test fluid.

### Claim 2 (depends on 1)

A method in accordance with claim 1, wherein the deviation is compared with a limit value.

### Claim 3 (depends on 2)

A method in accordance with claim 2, wherein the limit value is adjustable.

### Claim 4 (depends on 1)

A method in accordance with claim 1, wherein a quantity of test fluid is determined using the first measured pressure of the test fluid and/or the second measured pressure of the test fluid and in that a dimension of the workpiece is determined using the thus determined quantity of test fluid.

### Claim 5 (depends on 4)

A method in accordance with claim 4, wherein the quantity of test fluid is determined using the measured moisture content of the test fluid.

### Claim 6 (depends on 4)

A method in accordance with claim 4, wherein the temperature of the test fluid is measured and in that the quantity of test fluid is determined using the measured temperature of the test fluid.

### Claim 7 (depends on 4)

A method accordance with claim 4, wherein an ambient temperature is measured and in that the dimension of the workpiece is determined using the measured ambient temperature.