Leakage oil detection system

Patent metadata

Field	Value
Publication number	US-10234355-B2
Application number	US-201615205504-A
Country	US
Kind code	B2
Filing date	Jul 8, 2016
Priority date	Jul 15, 2015
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

A leakage oil detection system includes a measurement device including a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays, and an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and an analysis device that includes a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process to detect leakage oil.

First claim

What is claimed is:

1. A leakage oil detection system comprising:
a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays;
an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and
an analysis device including a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process,
wherein the imaging device controls exposure according to an exposure control value provided in the imaging device,
wherein the analysis device calls the imaged image which is recorded in the recording unit for the image processing unit, calculates brightness values of respective pixels in the imaged image, determines a maximum brightness value which has the largest value among the brightness values of the respective pixels, compares the maximum brightness value with a reference brightness value which is determined in advance, acquires the exposure control value of the imaging device, in which the nearest brightness value that is smaller than the reference brightness value is acquired, images the measured object again by the imaging device using the acquired exposure control value, transmits the acquired image to the image processing unit, and detects leakage oil by performing the image process by the image processing unit, and
wherein the reference brightness value is the brightness value of the leakage oil attachment part in a case in which a difference in the brightness values of the leakage oil attachment part and a part to which the leakage oil is not attached becomes the largest from an image which is imaged and acquired by putting oil on a surface of the measured object so as to change the exposure control value under an environment of 10 lux or less.

2. A leakage oil detection system comprising:
a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays;
an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and
an analysis device including a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process,
wherein the imaging device controls exposure according to an exposure control value provided in the imaging device,
wherein the analysis device calls the imaged image which is recorded in the recording unit for the image processing unit, calculates brightness values of respective pixels in the imaged image, determines a maximum brightness value which has the largest value among the brightness values of the respective pixels, compares the maximum brightness value with a reference brightness value which is determined in advance, acquires the exposure control value of the imaging device, in which the nearest brightness value that is smaller than the reference brightness value is acquired, images the measured object again by the imaging device using the acquired exposure control value, transmits the acquired image to the image processing unit, and detects leakage oil by performing the image process by the image processing unit, and
wherein the analysis device selects a selected irradiation range, in which an irradiation intensity of the ultraviolet rays becomes a value in a specified range, in an ultraviolet ray irradiation range, and sets the maximum value of the brightness of the respective pixels in the selected irradiation range in the imaged image as the maximum brightness value.

3. The leakage oil detection system according to claim 2 ,
wherein the irradiation intensity of the ultraviolet rays in the selected irradiation range is 90 to 100% of a maximum irradiation intensity of the light source.

4. A leakage oil detection system comprising:
a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays;
an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and
an analysis device including a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process,
wherein the imaging device controls exposure according to an exposure control value provided in the imaging device,
wherein the analysis device calls the imaged image which is recorded in the recording unit for the image processing unit, calculates brightness values of respective pixels in the imaged image, determines a maximum brightness value which has the largest value among the brightness values of the respective pixels, compares the maximum brightness value with a reference brightness value which is determined in advance, acquires the exposure control value of the imaging device, in which the nearest brightness value that is smaller than the reference brightness value is acquired, images the measured object again by the imaging device using the acquired exposure control value, transmits the acquired image to the image processing unit, and detects leakage oil by performing the image process by the image processing unit, and
wherein the analysis device acquires a ratio r of the maximum brightness value to the reference brightness value, and, in a case in which the maximum brightness value is smaller than the reference brightness value, images the measured object again by selecting the exposure control value which is the nearest to a value acquired by increasing the exposure control value by r times.

5. A leakage oil detection system comprising:
a light source that causes a measured object which includes a leakage oil attachment part to be irradiated with ultraviolet rays;
an imaging device that detects fluorescence emitted from the leakage oil attachment part which is irradiated with the ultraviolet rays, and performs imaging on the measured object; and
an analysis device including a driving control unit that controls operations of the light source and the imaging device, a recording unit that records an imaged image of the measured object which is imaged by the imaging device, and an image processing unit that calls the imaged image which is recorded in the recording unit and performs an image process,
wherein the imaging device controls exposure according to an exposure control value provided in the imaging device,
wherein the analysis device calls the imaged image which is recorded in the recording unit for the image processing unit, calculates brightness values of respective pixels in the imaged image, determines a maximum brightness value which has the largest value among the brightness values of the respective pixels, compares the maximum brightness value with a reference brightness value which is determined in advance, acquires the exposure control value of the imaging device, in which the nearest brightness value that is smaller than the reference brightness value is acquired, images the measured object again by the

Assignees

• Hitachi Ltd

Inventors

• Lu Li
• Ichimura Satoshi
• Moriyama Tomohiro
• Nukaga Jun
• Yamagishi Akira
• Saito yasutomo

Classifications

• H04N23/71

  Circuitry for evaluating the brightness variation · CPC title

• H04N23/56

  provided with illuminating means · CPC title

• H04N23/73

  by influencing the exposure time · CPC title

• G01M3/38

  by using light (G01M3/02 takes precedence) · CPC title

• G06T7/0004

  Industrial image inspection · CPC title