Leakage oil detector system and method

Patent metadata

Field	Value
Publication number	US-10113933-B2
Application number	US-201515519301-A
Country	US
Kind code	B2
Filing date	Mar 27, 2015
Priority date	Oct 17, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A system and method for detecting leakage oil with a high degree of accuracy while avoiding the complexity of the system and the influence of noise light comprise: ultraviolet light sources arranged to irradiate an oil-filled device from a plurality of different incidence angles, and are switched on and off at the respective incidence angles in sequence, and include a wavelength exciting oil; an imaging device to photograph the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light sources when the ultraviolet light sources are switched on; a recorder to record respective images photographed by the imaging device; and a display to display the respective images. The respective images are compared, a site where a light emitting position does not change always is judged as a leakage oil site, and a site emitting light or not emitting light occasionally is judged as a noise light site.

First claim

The invention claimed is:

1. A leakage oil detector system having:
an ultraviolet light source that is arranged so as to irradiate an oil-filled device from a plurality of different incidence angles, is switched on and off at the respective incidence angles in sequence, and includes a wavelength exciting oil;
an imaging device to photograph said oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light source when the ultraviolet light source is switched on;
a recorder to record respective images photographed by the imaging device;
an image processor to compare the respective images, judge a site where a light emitting position does not change always as a leakage oil site, and judge a site emitting light or not emitting light at different positions as a noise light site; and
a display to display the respective images.

2. A leakage oil detector system according to claim 1 , wherein the ultraviolet light source including the wavelength exciting oil has a light emission peak of 265±50 nm, 275±50 nm, 345±50 nm, or 365±50 nm.

3. A leakage oil detector system according to claim 1 , wherein the image processor quantitatively judges light quantities of the leakage oil site and the noise light site.

4. A leakage oil detector system according to claim 3 , wherein the leakage oil detector system has a judging function of a threshold value of brightness in order to quantitatively judge the light quantity at the image processor.

5. A leakage oil detector system according to claim 4 , wherein the judging function has the light quantity in the state of no leakage oil as back data beforehand.

6. A leakage oil detector system according to claim 1 , wherein the ultraviolet light source has a shifting means.

7. A leakage oil detector system according to claim 1 , wherein the leakage oil detector system further has a position correction means to positionally correct the respective images.

8. A leakage oil detection method including the steps of:
arranging an ultraviolet light source including a wavelength exciting oil so as to irradiate an oil-filled device from a plurality of different incidence angles;
switching the ultraviolet light source on and off at the respective incidence angles in sequence;
photographing the oil-filled device irradiated with ultraviolet light emitted from the ultraviolet light source when the ultraviolet light source is switched on; and
comparing the respective photographed images, judging a site where a light emitting position does not change always as a leakage oil site, and judging a site emitting light or not emitting light at different positions as a noise light site.

9. A leakage oil detection method according to claim 8 , wherein the ultraviolet light source including the wavelength exciting oil has a light emission peak of 265±50 nm, 275±50 nm, 345±50 nm, or 365±50 nm.

Assignees

• Hitachi Ltd

Inventors

• Lu Li
• Rokunohe Toshiaki
• Moriyama Tomohiro
• Nukaga Jun
• Yamagishi Akira
• Saito yasutomo

Classifications

• H05K999/99

  Electricity · mapped topic

• H01F27/12

  Oil cooling · CPC title

• G01M3/38 Primary

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

• G01N2021/6465

  Angular discrimination · CPC title

• G01N33/28

  Oils {, i.e. hydrocarbon liquids} (edible oils or edible fats G01N33/03) · CPC title