# US 2014/0192349 A1 · Film thickness measurement apparatus and film thickness measurement method

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- Number: US 2014/0192349 A1
- Document ID: US20140192349A1
- Status: Published application
- Kind: A1
- Application number: 14/239,468
- Filed: 2012-08-21
- Published: 2014-07-10
- Earliest claimed: 2011-08-30
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Inventors: Masaaki Kurokawa; Jun Yasui; Keiichi Kenmotsu; Shigetoshi Shiotani
- Web page: https://patentgrep.com/patent/US20140192349A1

## CPC

- G01K 1/143: for measuring surface temperatures
- F01D 21/003: {Arrangements for testing or measuring (for measuring vibrations G01H)}
- G01B 5/205: {of turbine blades or propellers}
- G01B 7/105: {for measuring thickness of coating}
- G01B 11/24: for measuring contours or curvatures
- F01D 5/288: {Protective coatings for blades}
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

A film thickness measurement apparatus includes: an ECT sensor for measuring a film thickness of a thermal barrier coating formed on a turbine blade; a storage unit for storing a measurement point on the turbine blade which is a point where the film thickness of the thermal barrier coating is measured; a laser displacement meter for measuring a shape of the turbine blade; a measurement position calculation unit for calculating an actual measurement point suitable for actual film thickness measurement using the ECT sensor, based on the shape of the turbine blade measured by the laser displacement meter and the measurement point on the turbine blade stored in the storage unit; and an arm drive unit for driving the ECT sensor to adjust a measurement position of the ECT sensor based on the actual measurement point calculated by the measurement position calculation unit.

## Claims

### Claim 1

A film thickness measurement apparatus comprising:
a film thickness measurement unit that measures a film thickness of a thermal barrier coating formed on an object to be measured;
a storage unit that stores a measurement point on the object to be measured which is a point where the film thickness of the thermal barrier coating is measured;
a shape measurement unit that measures a shape of the object to be measured;
a measurement position calculation unit that calculates an actual measurement point suitable for actual film thickness measurement using the film thickness measurement unit, based on the shape of the object to be measured which is measured by the shape measurement unit and the measurement point on the object to be measured which is stored in the storage unit; and
a drive unit that drives the film thickness measurement unit to adjust a measurement position of the film thickness measurement unit based on the actual measurement point calculated by the measurement position calculation unit.

### Claim 2 (depends on 1)

The film thickness measurement apparatus according to claim 1, wherein the shape measurement unit performs scanning with laser light in a linear direction to calculate the shape of the object to be measured in a two-dimensional plane.

### Claim 3 (depends on 1)

The film thickness measurement apparatus according to claim 1, further comprising a temperature measurement unit that measures a surface temperature of the thermal barrier coating,
wherein the film thickness measurement unit corrects the measured film thickness based on the surface temperature measured by the temperature measurement unit.

### Claim 4

A film thickness measurement method comprising the steps of:
a film thickness measurement unit measuring a film thickness of a thermal barrier coating formed on an object to be measured;
a shape measurement unit measuring a shape of the object to be measured;
a measurement position calculation unit calculating an actual measurement point suitable for actual film thickness measurement using the film thickness measurement unit, based on the shape of the object to be measured which is measured by the shape measurement unit and a measurement point on the object to be measured which is stored in a storage unit and is a point where the film thickness of the thermal barrier coating is measured; and
a drive unit driving the film thickness measurement unit to adjust a measurement position of the film thickness measurement unit based on the actual measurement point calculated by the measurement position calculation unit.