公开(公告)号：US20020162962A1

公开(公告)日：2002-11-07

申请号：US09847896

申请日：2001-05-03

Applicant: Bethlehem Steel Corporation

Inventor： Ralph G. Rudolph

IPC: G01N021/35

CPC classification number: G01N21/3554 ,  G01N21/3559

Abstract: A method and apparatus for detecting the presence of water on a surface of an object using infrared radiation. A surface area to be detected is illuminated with infrared radiation having a wavelength substantially absorbed by water. An optical system is employed to view images reflected from the surface area. An optical bandpass filter is disposed between the surface area and the sensor to limit transmission of infrared light to within a specific range of wavelengths known to be strongly absorbed by water. The sensor assembly produces a signal representative of the intensity of the reflected light. If the intensity signal is lower than a predetermined level water is detected and the signal may be used to trigger alarms, record the event or otherwise control the environment of the object. The present invention is particularly suited for detecting the presence of water on a moving sheet of metal during a manufacturing process.

Abstract translation: 一种使用红外辐射检测物体表面上的水的存在的方法和装置。 待被检测的表面积被具有基本被水吸收的波长的红外辐射照射。 采用光学系统来观察从表面区域反射的图像。 光学带通滤光器设置在表面区域和传感器之间，以将红外光的透射限制在已知被水强烈吸收的特定波长范围内。 传感器组件产生表示反射光强度的信号。 如果强度信号低于预定水平，则检测到水，并且该信号可用于触发报警，记录事件或以其他方式控制物体的环境。 本发明特别适用于在制造过程中检测在移动的金属片上的水的存在。