US 2017/0199080 A1Published application

Optical nondestructive testing method and optical nondestructive testing apparatus

AssigneeJtekt Corporation

InventorsNaoki MATSUMOTO, Kouya YOSHIDA, Ryota UMEZAWA, Jun MATSUMOTO

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Abstract

An optical nondestructive testing method includes: a laser emitting step involving emitting a heating laser from a laser output device such that the intensity of the heating laser applied to a measurement point changes sinusoidally; a laser intensity measuring step involving measuring the intensity of the heating laser by a phase difference detector; an infrared radiation intensity measuring step involving measuring, by the phase difference detector, the intensity of infrared radiation radiating from the measurement point; a phase difference measuring step involving determining, by the phase difference detector, a phase difference between the intensity of the heating laser and the intensity of the infrared radiation, and outputting the phase difference determined to a determiner from the phase difference detector; and a connection area calculating step involving determining, by the determiner, a connection area in accordance with the phase difference and phase difference-connection area correlation information.

Claims7

Dependent claims

An optical nondestructive testing method for determining a connection area between connection interfaces of a first member and a second member of a measurement object connected to each other directly or connected to each other with a connector interposed therebetween, the method involving applying a heating laser to a measurement point on a surface of the first member of the measurement object, the connection area being determined in accordance with information on the heating laser and information on a heated state of the measurement object obtained from the measurement point, the method comprising:

preparing a laser output device, a phase difference detector, and a determiner;
emitting the heating laser from the laser output device such that an intensity of the heating laser applied to the measurement point changes sinusoidally;
measuring the sinusoidally changing intensity of the heating laser by the phase difference detector;
measuring, by the phase difference detector, a sinusoidally changing intensity of infrared radiation radiating from the measurement point;
determining, by the phase difference detector, a phase difference between the sinusoidally changing intensity of the heating laser measured and the sinusoidally changing intensity of the infrared radiation measured, and outputting the phase difference determined to the determiner from the phase difference detector;
and
determining, by the determiner, the connection area in accordance with the phase difference received by the determiner and in accordance with phase difference-connection area correlation information stored in the determiner, the phase difference-connection area correlation information indicating a correlation between the phase difference and the connection area for the measurement object.

4 more elements

An optical nondestructive testing apparatus that determines a connection area between connection interfaces of a first member and a second member of a measurement object connected to each other directly or connected to each other with a connector interposed therebetween, the apparatus applying a heating laser to a measurement point on a surface of the first member of the measurement object, the connection area being determined in accordance with information on the heating laser and information on a heated state of the measurement object obtained from the measurement point, the apparatus comprising:

a laser output device to emit the heating laser such that an intensity of the heating laser applied to the measurement point changes sinusoidally;
a laser intensity detector to generate a laser intensity detection signal in accordance with the sinusoidally changing intensity of the heating laser applied to the measurement point and output the laser intensity detection signal to a phase difference detector;
an infrared radiation intensity detector to generate an infrared radiation intensity detection signal in accordance with a sinusoidally changing intensity of infrared radiation radiating from the measurement point and output the infrared radiation intensity detection signal to the phase difference detector;
the phase difference detector to measure the sinusoidally changing intensity of the heating laser in accordance with the laser intensity detection signal received, measure the sinusoidally changing intensity of the infrared radiation in accordance with the infrared radiation intensity detection signal received, determine a phase difference between the intensity of the heating laser measured and the intensity of the infrared radiation measured, and output the phase difference determined to a determiner;
and
the determiner to determine the connection area in accordance with the phase difference received and phase difference-connection area correlation information stored in the determiner, the phase difference-connection area correlation information indicating a correlation between the phase difference and the connection area for the measurement object.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/392,791Filed 28 Dec 2016
Priority: JP 2016-00421713 Jan 2016
Published: 13 Jul 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01J 5/0096
Radiation pyrometry, e.g. infrared or optical thermometry: for measuring wires, electrical contacts or electronic systems
G01J 5/0007
For sensing the radiant heat transfer of samples, e.g. emittance meter: of wafers or semiconductor substrates, e.g. using Rapid Thermal Processing
G01J 5/52
Radiation pyrometry, e.g. infrared or optical thermometry: using comparison with reference sources, e.g. disappearing-filament pyrometer
G01N 25/72
Investigating or analyzing materials by the use of thermal means: investigating presence of flaws