CA2487844A1 - Optical measurement of vane ring throat area - Google Patents
Optical measurement of vane ring throat area Download PDFInfo
- Publication number
- CA2487844A1 CA2487844A1 CA002487844A CA2487844A CA2487844A1 CA 2487844 A1 CA2487844 A1 CA 2487844A1 CA 002487844 A CA002487844 A CA 002487844A CA 2487844 A CA2487844 A CA 2487844A CA 2487844 A1 CA2487844 A1 CA 2487844A1
- Authority
- CA
- Canada
- Prior art keywords
- throat
- vane
- area
- vane ring
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A method and device for optically measuring throat area in a vane ring for a gas turbine engine following the steps of: placing the vane ring on a fixture with the periphery of each throat within an optical measuring field of view;
positioning a primary radiation source to cast an area of shadow on the vane ring delineating the throat as a dark area surrounded by an area of reflectance; capturing an image of the dark area with a radiation detector;
analyzing the image to acquire a dimensional data of the dark area, proportional to the absolute value of throat dimensions; progressively capturing and analyzing images from each of the individual throats; then processing and calibrating the dimensional data of each image to account for scaling and viewing direction (perspective distortion) to acquire an absolute value for the composite throat area of the vane ring.
positioning a primary radiation source to cast an area of shadow on the vane ring delineating the throat as a dark area surrounded by an area of reflectance; capturing an image of the dark area with a radiation detector;
analyzing the image to acquire a dimensional data of the dark area, proportional to the absolute value of throat dimensions; progressively capturing and analyzing images from each of the individual throats; then processing and calibrating the dimensional data of each image to account for scaling and viewing direction (perspective distortion) to acquire an absolute value for the composite throat area of the vane ring.
Claims (16)
1. A method of optically measuring throat area in a vane ring for a gas turbine engine, the vane ring having an annular array of vanes defining a plurality of individual throats between adjacent leading and following vanes of the array, each said individual throat being a planar opening with a periphery bounded in a radial direction by an inner vane shroud and an outer vane shroud and bounded in a circumferential direction by a trailing edge of the leading vane and a projected co-planar line on a convex surface of the adjacent following vane, characterized by the steps of:
placing the vane ring on a fixture in an imaging position wherein the periphery of a selected individual throat is within an optical measuring field of view;
positioning at least one primary radiation source in a throat defining position wherein an area of shadow is cast by said primary radiation source on the vane ring initiating in the plane of the selected throat, said area of shadow being surrounded by an area of reflectance;
capturing at least one image of a portion of the vane ring within the field of view with a radiation detector; and analyzing each image to acquire a dimensional data of a dark portion of each image proportional to an individual throat area of the selected throat.
I CLAIM:
1. A method of optically measuring throat area in a vane ring for a gas turbine engine, the vane ring having an annular array of vanes defining a plurality of individual throats between adjacent leading and following vanes of the array, each said individual throat being a planar opening with a periphery bounded in a radial direction by an inner vane shroud and an outer vane shroud and bounded in a circumferential direction by a trailing edge of the leading vane and a projected co-planar line on a convex surface of the adjacent following vane, the method comprising:
placing the vane ring on a fixture in an imaging position wherein the periphery of a selected individual throat is within an optical measuring field of view;
positioning at least one primary radiation source in a throat defining position wherein an area of shadow is cast by said primary radiation source on the vane ring initiating in the plane of the selected throat, said area of shadow being surrounded by an area of reflectance;
capturing at least one image of a portion of the vane ring within the field of view with a radiation detector; and analyzing each image to acquire a dimensional data of a dark portion of each image proportional to an individual throat area of the selected throat.
placing the vane ring on a fixture in an imaging position wherein the periphery of a selected individual throat is within an optical measuring field of view;
positioning at least one primary radiation source in a throat defining position wherein an area of shadow is cast by said primary radiation source on the vane ring initiating in the plane of the selected throat, said area of shadow being surrounded by an area of reflectance;
capturing at least one image of a portion of the vane ring within the field of view with a radiation detector; and analyzing each image to acquire a dimensional data of a dark portion of each image proportional to an individual throat area of the selected throat.
I CLAIM:
1. A method of optically measuring throat area in a vane ring for a gas turbine engine, the vane ring having an annular array of vanes defining a plurality of individual throats between adjacent leading and following vanes of the array, each said individual throat being a planar opening with a periphery bounded in a radial direction by an inner vane shroud and an outer vane shroud and bounded in a circumferential direction by a trailing edge of the leading vane and a projected co-planar line on a convex surface of the adjacent following vane, the method comprising:
placing the vane ring on a fixture in an imaging position wherein the periphery of a selected individual throat is within an optical measuring field of view;
positioning at least one primary radiation source in a throat defining position wherein an area of shadow is cast by said primary radiation source on the vane ring initiating in the plane of the selected throat, said area of shadow being surrounded by an area of reflectance;
capturing at least one image of a portion of the vane ring within the field of view with a radiation detector; and analyzing each image to acquire a dimensional data of a dark portion of each image proportional to an individual throat area of the selected throat.
2. A method according to claim 1 including:
progressively capturing and analyzing images from each of the individual throats; and processing the dimensional data of each image to acquire a composite throat area for the vane ring.
progressively capturing and analyzing images from each of the individual throats; and processing the dimensional data of each image to acquire a composite throat area for the vane ring.
3. A method according to claim 1 including:
progressively capturing and analyzing selected images from a selected plurality of the individual throats; and estimating an approximate throat area for the vane ring by prorating the dimensional data of said selected images over the vane ring.
progressively capturing and analyzing selected images from a selected plurality of the individual throats; and estimating an approximate throat area for the vane ring by prorating the dimensional data of said selected images over the vane ring.
4. A method according to claim 1 wherein the primary radiation source is collimated.
5. A method according to claim 1 wherein the primary radiation source projects light of spectrum selected from the group consisting of: visible; infrared; and ultraviolet.
6. A method according to claim 1 wherein the primary radiation source projects a pattern of radiation having high intensity and low intensity portions.
7. A method according to claim 1 including:
calibrating the dimensional data to determine the throat area of the selected throat by comparing the dimensional data to dimension data acquired from a master vanes having a known throat area.
calibrating the dimensional data to determine the throat area of the selected throat by comparing the dimensional data to dimension data acquired from a master vanes having a known throat area.
8. A method according to claim 1 including:
calibrating the dimensional data to determine the throat area in the plane of the selected throat by applying at least one scaling factor to the dimensional data.
calibrating the dimensional data to determine the throat area in the plane of the selected throat by applying at least one scaling factor to the dimensional data.
9. A method according to claim 1 including analyzing the image by pixel counting.
10. A method according to claim 8 including:
applying a first scaling factor a first dimension of the data and a second scaling factor to a second dimension of the data, where the plane of the selected throat and a viewing direction of the radiation detector are non-perpendicular.
applying a first scaling factor a first dimension of the data and a second scaling factor to a second dimension of the data, where the plane of the selected throat and a viewing direction of the radiation detector are non-perpendicular.
11. A method according to claim 1 including:
illuminating the trailing edge of the leading vane with an auxiliary radiation source.
illuminating the trailing edge of the leading vane with an auxiliary radiation source.
12. A method according to claim 1 including:
illuminating the trailing edge of the following vane with an auxiliary radiation source to reduce undesirable shadow on the following vane.
illuminating the trailing edge of the following vane with an auxiliary radiation source to reduce undesirable shadow on the following vane.
13. A method according to claim 1 including:
adjusting the primary radiation source to optimize contrast between areas of reflectance and shadow.
adjusting the primary radiation source to optimize contrast between areas of reflectance and shadow.
14. A method according to claim 1 wherein the fixture includes a rotary indexing table.
15. A device for optically measuring throat area in a vane ring for a gas turbine engine, the vane ring having an annular array of vanes defining a plurality of individual throats between adjacent Leading and following vanes of the array, each said individual throat being a planar opening with a periphery bounded in a radial direction by an inner vane shroud and an outer vane shroud and bounded in a circumferential direction by a trailing edge of the leading vane and a projected co-planar line on a convex surface of the adjacent following vane , characterized in that the device includes:
fixture means for holding the vane ring in an imaging position wherein the periphery of a selected individual throat is within an optical measuring field of view;
a primary radiation source disposed in a throat defining position wherein an area of shadow is cast by said primary radiation source on the vane ring initiating in the plane of the selected throat, said area of shadow being surrounded by an area of reflectance;
radiation detector means for capturing an image of a portion of the vane ring within the field of view; and.
image analyzing means for analyzing the image to acquire a dimensional data of a dark portion of the image proportional to an individual throat area of the selected throat.
fixture means for holding the vane ring in an imaging position wherein the periphery of a selected individual throat is within an optical measuring field of view;
a primary radiation source disposed in a throat defining position wherein an area of shadow is cast by said primary radiation source on the vane ring initiating in the plane of the selected throat, said area of shadow being surrounded by an area of reflectance;
radiation detector means for capturing an image of a portion of the vane ring within the field of view; and.
image analyzing means for analyzing the image to acquire a dimensional data of a dark portion of the image proportional to an individual throat area of the selected throat.
16. A device according to claim 15, wherein the fixture includes a rotary indexing table; and the device further includes dimensional data processing means for processing the dimensional data of each image to acquire a composite throat area for the vane ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2487844A CA2487844C (en) | 2002-06-06 | 2003-06-03 | Optical measurement of vane ring throat area |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002389484A CA2389484A1 (en) | 2002-06-06 | 2002-06-06 | Optical measuremnet of vane ring throat area |
| CA2,389,484 | 2002-06-06 | ||
| CA2487844A CA2487844C (en) | 2002-06-06 | 2003-06-03 | Optical measurement of vane ring throat area |
| PCT/CA2003/000811 WO2003104747A1 (en) | 2002-06-06 | 2003-06-03 | Optical measurement of vane ring throat area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2487844A1 true CA2487844A1 (en) | 2003-12-18 |
| CA2487844C CA2487844C (en) | 2010-08-10 |
Family
ID=34137139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2487844A Expired - Lifetime CA2487844C (en) | 2002-06-06 | 2003-06-03 | Optical measurement of vane ring throat area |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2487844C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006042397A1 (en) * | 2004-10-22 | 2006-04-27 | Pratt & Whitney Canada Corp. | Illumination system for measurement system |
-
2003
- 2003-06-03 CA CA2487844A patent/CA2487844C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006042397A1 (en) * | 2004-10-22 | 2006-04-27 | Pratt & Whitney Canada Corp. | Illumination system for measurement system |
| US7305118B2 (en) | 2004-10-22 | 2007-12-04 | Pratt & Whitney Canada Corp. | Illumination system for measurement system |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2487844C (en) | 2010-08-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20230605 |